Protection control device for air compression system

Abstract

The invention discloses a protection control device for an air compression system, which relates to the technical field of compressed air energy storage power generation and comprises a control module, an air purifier protection module, an air compressor protection module and a circulating supercharger protection module. The control module is used for receiving the air compressor state data transmitted by the air compressor protection module and the circulating supercharger state data of the circulating supercharger protection module; the air compressor unit is protected and controlled according to the air compressor state data and preset air compressor control logic; and performing protection control on the air purifier according to the air purifier state data and preset air purifier control logic, and performing protection control on the circulating supercharger unit according to the circulating supercharger state data and preset circulating supercharger control logic. According to the technical scheme, the control logic of the main equipment is optimally designed, and safe and efficient operation of the air compression system of the compressed air energy storage power station in the whole process from starting to full load is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage and power generation, and in particular to a protection control device for an air compression system. Background Art

[0002] Renewable energy sources, such as wind and solar, are subject to the influence of natural environmental factors. Their energy input during power generation cannot be precisely controlled like fossil fuels, resulting in large load and frequency fluctuations and high instability, leading to large-scale wind and solar power curtailment. Consequently, large-scale energy storage technologies for the renewable energy power generation industry have emerged. Compressed air energy storage technology, compared to other types of energy storage systems, boasts a long operating life, large storage capacity, and strong environmental friendliness. It is finding increasing application in advanced new energy technologies such as large-scale power distribution and renewable energy applications.

[0003] Currently, the development of compressed air energy storage technology is still at the test platform stage, used only for technical verification. Large-scale industrial production has yet to be implemented, and a standardized, unified, and achievable engineering application model has yet to be established. The deep-cold liquefied air energy storage and power generation system is a relatively complex energy utilization and conversion system, encompassing multiple types of equipment, including low-temperature, high-temperature, high-pressure, and high-speed. To improve system energy efficiency and meet the storage and utilization requirements for cold and heat energy, the operating methods and parameters of the deep-cold liquefied air energy storage and power generation system and its key individual components are highly specific. Unlike traditional coal-fired or combined-cycle power plants, the entire operation process is divided into two independent stages: daytime energy release and nighttime energy storage. However, due to the cyclic storage and release of energy and working fluids, the two stages are strongly thermodynamically coupled. In terms of operating parameters, to meet the high requirements for comprehensive cold and heat energy utilization, the internal heat transfer process is complex and the external operating conditions are variable. To meet the requirements for high efficiency and stability under these special operating conditions, each individual device and subsystem has extremely high requirements for equipment selection and operating parameters.

[0004] Therefore, for complex energy storage systems that include thermodynamic processes related to refrigeration, liquefaction, cold storage, heat storage, and power generation, it is necessary to formulate corresponding safety protection control strategies based on their special operating modes and complex and changeable operating conditions. Summary of the Invention

[0005] In order to solve at least one of the technical problems in the above background technology section, the embodiment of the present invention provides a protection control device for an air compression system, which is used to optimize the control logic of the main equipment and effectively ensure the safe and efficient operation of the air compression system of the compressed air energy storage power station from startup to full load.

[0006] An embodiment of the present invention also provides a protection control device for an air compression system, wherein the air compression system includes an air filter, an air compressor unit, an air purifier, and a circulating booster unit. The device includes:

[0007] A control module, an air purifier protection module, and an air compressor protection module and a circulating booster protection module connected to the air purifier protection module, wherein: the air compressor protection module includes a first differential pressure measuring point set at both ends of the air filter and a first pressure measuring point set, a first temperature measuring point set, a first vibration measuring point set, a first liquid level measuring point set, and a first flow measuring point set set on the air compressor unit; the air purifier protection module includes a first differential pressure measuring point set, a second pressure measuring point set, a second temperature measuring point set, an air inlet constant temperature electric heater flow measuring point, and an air purifier outlet air content measuring point set on the air purifier; the circulating booster protection module includes a third pressure measuring point set, a third temperature measuring point set, a second liquid level measuring point set, a second flow measuring point set, and a second vibration measuring point set on the circulating booster unit;

[0008] The control module is used to receive the air compressor status data transmitted by the first differential pressure measuring point, the first pressure measuring point set, the first temperature measuring point set, the first vibration measuring point set, the first liquid level measuring point set and the first flow measuring point set, the air purifier status data transmitted by the first differential pressure measuring point set, the second pressure measuring point set, the second temperature measuring point set, the air inlet constant temperature electric heater flow measuring point and the air purifier outlet air content measuring point, and the circulating booster status data transmitted by the third pressure measuring point set, the third temperature measuring point set, the second liquid level measuring point set, the second flow measuring point set and the second vibration measuring point set, and perform protection control on the air compressor unit according to the air compressor status data and the preset air compressor control logic, perform protection control on the air purifier according to the air purifier status data and the preset air purifier control logic, and perform protection control on the circulating booster unit according to the circulating booster status data and the preset circulating booster control logic.

[0009] In some optional aspects of this embodiment, the air compressor unit includes a first-stage air compressor and a second-stage air compressor, wherein a first-stage air intake buffer and a first-stage exhaust buffer are respectively provided at both ends of the first-stage air compressor, and a second-stage air intake buffer and a second-stage exhaust buffer are respectively provided at both ends of the second-stage air compressor, a first-stage cooler and a first-stage moisture separator are sequentially provided between the first-stage exhaust buffer and the second-stage air intake buffer, and a second-stage cooler and a second-stage moisture separator are sequentially provided between the second-stage exhaust buffer and the air purifier, wherein:

[0010] The first pressure measurement point set includes: a first-stage air compressor intake pressure measurement point disposed between the first-stage air intake buffer and the first-stage air compressor, a first-stage air compressor exhaust pressure measurement point disposed between the first-stage air compressor and the first-stage exhaust buffer, and a second-stage air compressor exhaust pressure measurement point disposed downstream of the second-stage air separator;

[0011] The first temperature measurement point set includes: a first-stage air compressor intake temperature measurement point set between the first-stage air intake buffer and the first-stage air compressor, a first-stage air compressor exhaust temperature measurement point set between the first-stage air compressor and the first-stage exhaust buffer, a second-stage air compressor intake temperature measurement point set between the second-stage air intake buffer and the second-stage air compressor, a second-stage air compressor exhaust temperature measurement point set between the second-stage air compressor and the second-stage exhaust buffer, and a second-stage cooler exhaust temperature measurement point set downstream of the second-stage moisture separator;

[0012] The first liquid level measurement point set includes: a first-level water separator liquid level measurement point of the air compressor set on the first-level water separator, a second-level air compressor air intake buffer liquid level measurement point set on the second-level air intake buffer, and a second-level water separator liquid level measurement point of the air compressor set on the second-level water separator;

[0013] The first flow measurement point set includes: a secondary air compressor outlet flow measurement point arranged downstream of the secondary moisture divider.

[0014] In some optional aspects of this embodiment, the first-stage air compressor and the second-stage air compressor are coaxially arranged, and the air compressor unit further includes an auxiliary oil pump, a coaxial oil pump, an oil cooler, an oil filter, a constant temperature electric heater, and a lubricating oil tank, wherein:

[0015] The air compressor protection module also includes air compressor oil filter differential pressure measuring points arranged at both ends of the oil filter; the first pressure measuring point set also includes an air compressor lubricating oil main pipe oil supply pressure measuring point; the first temperature measuring point set also includes: an air compressor bearing temperature measuring point, an air compressor lubricating oil main pipe oil supply temperature measuring point, an air compressor lubricating oil tank oil temperature measuring point, an air compressor motor bearing temperature measuring point, and an air compressor motor stator winding temperature measuring point; the first vibration measuring point set includes: an air compressor bearing vibration measuring point and an air compressor motor bearing vibration measuring point; the first flow measuring point set also includes: an air compressor oil cooler cooling water return total flow measuring point arranged on the oil cooler.

[0016] In some optional aspects of this embodiment, the air purifier includes an electric heater, a first molecular sieve air purifier, and a second molecular sieve air purifier, wherein:

[0017] The first differential pressure measuring point set includes: air purifier inlet and outlet differential pressure measuring points set at both ends of the second molecular sieve air purifier and an air outlet differential pressure measuring point when the two sieves are pressurized and set between the first molecular sieve air purifier and the second molecular sieve air purifier; the second pressure measuring point set includes: a sieve 1 air outlet pressure measuring point set downstream of the first molecular sieve air purifier and a sieve 2 air outlet pressure measuring point set downstream of the second molecular sieve air purifier;

[0018] The second temperature measurement point set includes: a sieve 1 air inlet temperature measurement point set upstream of the first molecular sieve air purifier, a sieve 2 air inlet temperature measurement point set upstream of the second molecular sieve air purifier, a sieve 1 air outlet temperature measurement point set downstream of the first molecular sieve air purifier, a sieve 2 air outlet temperature measurement point set upstream of the second molecular sieve air purifier, an air purifier outlet temperature measurement point set downstream of the first molecular sieve air purifier, and an electric heater internal temperature measurement point set on the electric heater.

[0019] In some optional embodiments of this embodiment, the circulating booster unit includes a primary circulating booster and a secondary circulating booster, wherein a primary air intake buffer and a primary exhaust buffer are respectively provided at both ends of the primary circulating booster, and a secondary air intake buffer and a secondary exhaust buffer are respectively provided at both ends of the secondary circulating booster, a third-stage cooler and a third-stage water separator are sequentially provided between the first-stage exhaust buffer and the second-stage air intake buffer, and a fourth-stage cooler and a fourth-stage water separator are sequentially provided between the second-stage exhaust buffer and the air liquefaction system, wherein:

[0020] The third pressure measurement point set includes: a primary circulation supercharger intake pressure measurement point set between the primary circulation supercharger and the primary circulation supercharger, a primary circulation supercharger exhaust pressure measurement point set between the primary circulation supercharger and the primary exhaust buffer, and a secondary circulation supercharger exhaust pressure measurement point set downstream of the fourth-stage water separator;

[0021] The third temperature measurement point set includes: a primary circulation supercharger intake temperature measurement point set between the primary air intake buffer and the primary circulation supercharger, a primary circulation supercharger exhaust temperature measurement point set between the primary circulation supercharger and the primary exhaust buffer, a secondary circulation supercharger intake temperature measurement point set between the secondary air intake buffer and the secondary circulation supercharger, a secondary circulation supercharger exhaust temperature measurement point set between the secondary circulation supercharger and the secondary exhaust buffer, and a fourth-stage cooler exhaust temperature measurement point set downstream of the fourth-stage moisture divider;

[0022] The second liquid level measurement point set includes: a circulating booster third-stage water divider liquid level measurement point set on the third-stage water divider, a secondary circulating booster air intake buffer liquid level measurement point set on the secondary air intake buffer, and a circulating booster fourth-stage water divider liquid level measurement point set on the fourth-stage water divider;

[0023] The second flow measurement point set includes: a secondary circulation booster outlet flow measurement point arranged downstream of the fourth-stage water distributor.

[0024] In some optional embodiments of this embodiment, the first-stage circulating booster and the second-stage circulating booster are coaxially arranged, and the circulating booster unit further includes an auxiliary oil pump, a coaxial oil pump, an oil cooler, an oil filter, a constant temperature electric heater and a lubricating oil tank, wherein: the circulating booster protection module also includes a circulating booster oil filter differential pressure measuring point arranged at both ends of the oil filter; the third pressure measuring point set also includes a circulating booster lubricating oil main pipe oil supply pressure measuring point; the third temperature measuring point set also includes: a circulating booster bearing temperature measuring point, a circulating booster lubricating oil main pipe oil supply temperature measuring point, a circulating booster lubricating oil tank oil temperature measuring point, a circulating booster motor bearing temperature measuring point and a circulating booster motor stator winding temperature measuring point; the second flow measuring point set also includes: a circulating booster cooler cooling water return total flow measuring point arranged on the oil cooler; the second vibration measuring point set includes: a circulating booster bearing vibration measuring point and a circulating booster motor bearing vibration measuring point.

[0025] In some optional aspects of this embodiment, the preset air compressor control logic includes a preset air compressor start sub-logic and a preset air compressor early warning sub-logic, wherein:

[0026] The control module is configured to determine whether the air compressor unit can be started based on the first air compressor status sub-data transmitted by the first differential pressure measuring point, the air compressor oil filter differential pressure measuring point, the air compressor lubricating oil main pipe oil supply pressure measuring point, the air compressor lubricating oil tank oil temperature measuring point, the air compressor oil cooler cooling water return total flow measuring point, the air compressor first-level water separator liquid level measuring point, the second-level air compressor intake buffer liquid level measuring point, the air compressor second-level water separator liquid level measuring point, the air compressor bearing vibration measuring point, and the air compressor motor bearing vibration measuring point, and the preset air compressor start sub-logic;

[0027] The control module is used to determine whether the air compressor group has an abnormality based on the second air compressor status sub-data transmitted by the first-stage air compressor intake pressure measuring point, the second-stage air compressor exhaust pressure measuring point, the air compressor lubricating oil main pipe oil supply pressure measuring point, the first-stage air compressor exhaust temperature measuring point, the second-stage air compressor exhaust temperature measuring point, the air compressor bearing temperature measuring point, the air compressor lubricating oil main pipe oil supply temperature measuring point, the air compressor lubricating oil tank oil temperature measuring point, the air compressor motor bearing temperature measuring point, the air compressor motor stator winding temperature measuring point, the air compressor oil filter differential pressure measuring point, the air compressor oil cooler cooling water return total flow measuring point, the air compressor bearing vibration measuring point and the air compressor motor bearing vibration measuring point, and the preset air compressor early warning sub-logic.

[0028] In some optional methods of this embodiment, the control module is used to determine whether there is an abnormality in the air purifier based on the air purifier outlet air CO2 content measurement point, the air inlet constant temperature electric heater flow measurement point, the air purifier inlet and outlet differential pressure measurement point, the air outlet differential pressure measurement point when the two screens are pressurized, the screen 1 air outlet pressure measurement point, the screen 2 air outlet pressure measurement point, the screen 1 air inlet temperature measurement point, the screen 2 air inlet temperature measurement point and the air purifier status data transmitted by the electric heater internal temperature measurement point and the preset air purifier control logic.

[0029] In some optional aspects of this embodiment, the preset circulation booster control logic includes a preset circulation booster start sub-logic and a preset circulation booster warning sub-logic, wherein:

[0030] The control module is used to determine whether the circulating supercharger unit can be started according to the first circulating supercharger status sub-data transmitted by the circulating supercharger bearing vibration measurement point and the circulating supercharger motor bearing vibration measurement point and the preset circulating supercharger start sub-logic;

[0031] The control module is used to determine whether the circulating booster unit has an abnormality based on the circulating booster lubricating oil main pipe oil supply pressure measuring point, the circulating booster lubricating oil main pipe oil supply temperature measuring point, the circulating booster oil filter differential pressure measuring point, the circulating booster oil cooler cooling water return total flow measuring point, the secondary circulating booster exhaust pressure measuring point, the primary circulating booster exhaust temperature measuring point, the secondary circulating booster exhaust temperature measuring point, the circulating booster bearing temperature measuring point, the circulating booster motor bearing temperature measuring point, the circulating booster motor stator winding temperature measuring point, the circulating booster lubricating oil tank oil temperature measuring point, the circulating booster bearing vibration measuring point, and the second circulating booster status sub-data transmitted by the circulating booster motor bearing vibration measuring point and the preset circulating booster early warning sub-logic.

[0032] The protection and control device for an air compression system provided in an embodiment of the present invention optimizes the control logic design of main equipment such as the air compressor unit, the air purifier, and the circulating booster unit by setting multiple monitoring points on the air compressor unit, the air purifier, and the circulating booster unit, thereby effectively ensuring the safe and efficient operation of the air compression system of the compressed air energy storage power station from startup to full load. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0034] Figure 1 This is a flow chart of a compressed air energy storage system in an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the structure of a protection control device for an air compression system according to an embodiment of the present invention;

[0036] Figure 3 This is one of the structural diagrams of the air compressor protection module in an embodiment of the present invention;

[0037] Figure 4 This is a second structural diagram of the air compressor protection module according to an embodiment of the present invention;

[0038] Figure 5 Schematic diagram of the structure of the air purifier protection module and the circulating booster protection module in an embodiment of the present invention;

[0039] Figure 6 Schematic diagram of another structure of the air purifier protection module in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0041] like Figure 1 As shown in the figure, the entire compressed air energy storage power station can be decomposed into five subsystems according to their functions: air compression, air liquefaction, heat storage / release, cold storage / release, and expansion power generation. Its working process is divided into two stages that are carried out simultaneously: the energy storage stage and the energy release stage. In the energy storage stage, the air compression system, air liquefaction system, heat storage system and cold release system operate in coordination; in the energy release stage, the expansion power generation system, cold storage system and heat release system operate in coordination.

[0042] The main components of the air compression system include air filters, air compressors, air purifiers, and circulating boosters. Their primary function is to utilize excess electrical energy from the air compressors and circulating boosters to compress filtered and purified air upstream to meet downstream air liquefaction requirements. The main components of the air liquefaction system include a booster expansion refrigeration unit (including booster and expansion units), a main heat exchanger, a gas-liquid separator, an air cooler, and a liquid expander or throttle valve. Their primary function is to gradually cool the purified, high-pressure, room-temperature, dry air upstream to a low temperature to produce liquefied air that meets process requirements. The main components of the heat storage / dissipation system include interstage and final-stage coolers, interstage reheaters, high / low-temperature heat storage tanks, high / low-temperature heat storage pumps, circulating pumps, and closed-circuit cooling towers. During the storage phase, the low-temperature heat storage medium is fed into the interstage and final-stage coolers to store compression heat energy. During the release phase, the high-temperature heat storage medium is fed into the interstage reheaters to release the stored heat energy, thus enabling heat recovery and reuse. The main components of the cold storage / discharge system include a cryogenic liquid storage tank, a cryogenic pump, an evaporator, a packed bed cold storage tank system, and a circulating fan. Its primary function is to store the cold energy released by the phase change of liquefied air in the evaporator during the discharge phase and then transfer this cold energy to the air liquefaction system during the storage phase, thus recovering and reusing the cold energy. The expansion power generation system primarily consists of a multi-stage interstage reheat air expansion generator set. This subsystem is the core component of the energy storage power generation system. During the discharge phase, the high-pressure air at the evaporator outlet is heated by each stage of the reheater, then propels each stage of the air expander to perform work, releasing energy.

[0043] like Figure 1As shown in the figure, during the energy storage phase, the raw air, cleaned by the air filter, undergoes two-stage compression and cooling in the air compressor unit before entering a molecular sieve air purifier. The purified air then merges with the return air from the main heat exchanger and enters the circulating booster unit for two-stage compression and cooling. The intermediate-pressure air exiting the final cooler of the circulating booster unit enters the booster end of the booster expansion refrigeration unit. After being boosted, it is cooled by an air cooler and enters the main heat exchanger. In the main heat exchanger, this boosted air is cooled to a certain temperature by the return air and the external cold source air from the packed bed cold storage tank. It is then split into two streams. One stream is fed into the expansion end of the booster expansion refrigeration unit to perform work; the other stream continues to cool and liquefy in the main heat exchanger. After exiting the main heat exchanger, it is throttled by a throttle valve. Both streams ultimately enter the gas-liquid separator for gas-liquid separation. After gas-liquid separation, the return air is heated to room temperature through the main heat exchanger and then returns to the suction port of the circulating booster unit to continue circulating compression; the separated liquid air enters the low-temperature liquid storage tank for storage.

[0044] In the heat storage system, the 20°C heat storage medium in the low-temperature heat storage tank enters the low-temperature heat storage pump for pressurization. It is then fed into four interstage and final-stage coolers to cool the exhaust gas from each compressor stage to approximately 25°C. Simultaneously, the heat storage medium is heated to a high temperature and collected and fed into the high-temperature heat storage tank, storing the heat energy from the compression process. In the cold release system, the cold energy stored in the packed-bed cold storage tank is fed into the air liquefaction system via circulating air. This circulating air is first pressurized by the circulating fan, then cooled by the cold storage tank. It then enters the main heat exchanger, where it is heated to near ambient temperature before returning to the circulating fan inlet, realizing cold energy utilization.

[0045] For complex energy storage systems that include thermodynamic processes related to refrigeration, liquefaction, cold storage, heat storage and power generation, corresponding safety protection control strategies need to be formulated based on their special operating modes and complex and changeable operating conditions.

[0046] In view of this, if Figure 2 As shown, the present application provides a protection control device for an air compression system, comprising: a control module 10, an air purifier protection module 20, and an air compressor protection module 30 and a cycle booster protection module 40 connected to the air purifier protection module 20, wherein:

[0047] The control module is used to receive the air compressor status data transmitted by the first differential pressure measuring point, the first pressure measuring point set, the first temperature measuring point set, the first vibration measuring point set, the first liquid level measuring point set and the first flow measuring point set, the air purifier status data transmitted by the first differential pressure measuring point set, the second pressure measuring point set, the second temperature measuring point set, the air inlet constant temperature electric heater flow measuring point and the air purifier outlet air content measuring point, and the circulating booster status data transmitted by the third pressure measuring point set, the third temperature measuring point set, the second liquid level measuring point set, the second flow measuring point set and the second vibration measuring point set, and perform protection control on the air compressor unit according to the air compressor status data and the preset air compressor control logic, perform protection control on the air purifier according to the air purifier status data and the preset air purifier control logic, and perform protection control on the circulating booster unit according to the circulating booster status data and the preset circulating booster control logic.

[0048] In some optional embodiments of this embodiment, such as Figure 3 As shown, the air compressor unit includes a first-stage air compressor and a second-stage air compressor, wherein a first-stage air intake buffer and a first-stage exhaust buffer are respectively provided at both ends of the first-stage air compressor, and a second-stage air intake buffer and a second-stage exhaust buffer are respectively provided at both ends of the second-stage air compressor, a first-stage cooler and a first-stage moisture separator are sequentially provided between the first-stage exhaust buffer and the second-stage air intake buffer, and a second-stage cooler and a second-stage moisture separator are sequentially provided between the second-stage exhaust buffer and the air purifier, wherein:

[0049] The first pressure measurement point set includes: a first-stage air compressor intake pressure measurement point disposed between the first-stage air intake buffer and the first-stage air compressor, a first-stage air compressor exhaust pressure measurement point disposed between the first-stage air compressor and the first-stage exhaust buffer, and a second-stage air compressor exhaust pressure measurement point disposed downstream of the second-stage air separator;

[0050] The first temperature measurement point set includes: a first-stage air compressor intake temperature measurement point set between the first-stage air intake buffer and the first-stage air compressor, a first-stage air compressor exhaust temperature measurement point set between the first-stage air compressor and the first-stage exhaust buffer, a second-stage air compressor intake temperature measurement point set between the second-stage air intake buffer and the second-stage air compressor, a second-stage air compressor exhaust temperature measurement point set between the second-stage air compressor and the second-stage exhaust buffer, and a second-stage cooler exhaust temperature measurement point set downstream of the second-stage moisture separator;

[0051] The first liquid level measurement point set includes: a first-level water separator liquid level measurement point of the air compressor set on the first-level water separator, a second-level air compressor air intake buffer liquid level measurement point set on the second-level air intake buffer, and a second-level water separator liquid level measurement point of the air compressor set on the second-level water separator;

[0052] The first flow measurement point set includes: a secondary air compressor outlet flow measurement point arranged downstream of the secondary moisture divider.

[0053] In some optional embodiments of this embodiment, such as Figure 4 As shown, the first-stage air compressor and the second-stage air compressor are coaxially arranged, and the air compressor unit further includes an auxiliary oil pump, a coaxial oil pump, an oil cooler, an oil filter, a constant temperature electric heater and a lubricating oil tank, wherein:

[0054] The air compressor protection module also includes air compressor oil filter differential pressure measuring points arranged at both ends of the oil filter; the first pressure measuring point set also includes an air compressor lubricating oil main pipe oil supply pressure measuring point; the first temperature measuring point set also includes: an air compressor bearing temperature measuring point, an air compressor lubricating oil main pipe oil supply temperature measuring point, an air compressor lubricating oil tank oil temperature measuring point, an air compressor motor bearing temperature measuring point, and an air compressor motor stator winding temperature measuring point; the first vibration measuring point set includes: an air compressor bearing vibration measuring point and an air compressor motor bearing vibration measuring point; the first flow measuring point set also includes: an air compressor oil cooler cooling water return total flow measuring point arranged on the oil cooler.

[0055] In some optional embodiments of this embodiment, such as Figure 5 As shown, the air purifier includes an electric heater, a first molecular sieve air purifier and a second molecular sieve air purifier, wherein:

[0056] The first differential pressure measuring point set includes: air purifier inlet and outlet differential pressure measuring points set at both ends of the second molecular sieve air purifier and an air outlet differential pressure measuring point when the two sieves are pressurized and set between the first molecular sieve air purifier and the second molecular sieve air purifier; the second pressure measuring point set includes: a sieve 1 air outlet pressure measuring point set downstream of the first molecular sieve air purifier and a sieve 2 air outlet pressure measuring point set downstream of the second molecular sieve air purifier; the second temperature measuring point set includes: a sieve 1 air inlet temperature measuring point set upstream of the first molecular sieve air purifier, a sieve 2 air inlet temperature measuring point set upstream of the second molecular sieve air purifier, a sieve 1 air outlet temperature measuring point set downstream of the first molecular sieve air purifier, a sieve 2 air outlet temperature measuring point set upstream of the second molecular sieve air purifier, an air purifier outlet temperature measuring point set downstream of the first molecular sieve air purifier, and an electric heater internal temperature measuring point set on the electric heater.

[0057] In some optional embodiments of this embodiment, such as Figure 5 As shown, the circulating supercharger unit includes a primary circulating supercharger and a secondary circulating supercharger, wherein a primary air intake buffer and a primary exhaust buffer are respectively provided at both ends of the primary circulating supercharger, and a secondary air intake buffer and a secondary exhaust buffer are respectively provided at both ends of the secondary circulating supercharger, a third-stage cooler and a third-stage water separator are sequentially provided between the first-stage exhaust buffer and the second-stage air intake buffer, and a fourth-stage cooler and a fourth-stage water separator are sequentially provided between the second-stage exhaust buffer and the air liquefaction system, wherein:

[0058] The third pressure measurement point set includes: a primary circulation supercharger intake pressure measurement point set between the primary circulation supercharger and the primary circulation supercharger, a primary circulation supercharger exhaust pressure measurement point set between the primary circulation supercharger and the primary exhaust buffer, and a secondary circulation supercharger exhaust pressure measurement point set downstream of the fourth-stage water separator;

[0059] The third temperature measurement point set includes: a primary circulation supercharger intake temperature measurement point set between the primary air intake buffer and the primary circulation supercharger, a primary circulation supercharger exhaust temperature measurement point set between the primary circulation supercharger and the primary exhaust buffer, a secondary circulation supercharger intake temperature measurement point set between the secondary air intake buffer and the secondary circulation supercharger, a secondary circulation supercharger exhaust temperature measurement point set between the secondary circulation supercharger and the secondary exhaust buffer, and a fourth-stage cooler exhaust temperature measurement point set downstream of the fourth-stage moisture divider;

[0060] The second liquid level measurement point set includes: a circulating booster third-stage water divider liquid level measurement point set on the third-stage water divider, a secondary circulating booster air intake buffer liquid level measurement point set on the secondary air intake buffer, and a circulating booster fourth-stage water divider liquid level measurement point set on the fourth-stage water divider;

[0061] The second flow measurement point set includes: a secondary circulation booster outlet flow measurement point arranged downstream of the fourth-stage water distributor.

[0062] In some optional embodiments of this embodiment, such as Figure 6 As shown, the primary circulation booster and the secondary circulation booster are coaxially arranged, and the circulation booster unit further includes an auxiliary oil pump, a coaxial oil pump, an oil cooler, an oil filter, a constant temperature electric heater and a lubricating oil tank, wherein:

[0063] The circulating supercharger protection module also includes a circulating supercharger oil filter differential pressure measuring point arranged at both ends of the oil filter; the third pressure measuring point set also includes a circulating supercharger lubricating oil main pipe oil supply pressure measuring point; the third temperature measuring point set also includes: a circulating supercharger bearing temperature measuring point, a circulating supercharger lubricating oil main pipe oil supply temperature measuring point, a circulating supercharger lubricating oil tank oil temperature measuring point, a circulating supercharger motor bearing temperature measuring point and a circulating supercharger motor stator winding temperature measuring point; the second flow measuring point set also includes: a circulating supercharger oil cooler cooling water return total flow measuring point arranged on the oil cooler; the second vibration measuring point set includes: a circulating supercharger bearing vibration measuring point and a circulating supercharger motor bearing vibration measuring point.

[0064] In some optional aspects of this embodiment, the preset air compressor control logic includes a preset air compressor start sub-logic and a preset air compressor early warning sub-logic, wherein:

[0065] The control module is configured to determine whether the air compressor unit can be started based on the first air compressor status sub-data transmitted by the first differential pressure measuring point, the air compressor oil filter differential pressure measuring point, the air compressor lubricating oil main pipe oil supply pressure measuring point, the air compressor lubricating oil tank oil temperature measuring point, the air compressor oil cooler cooling water return total flow measuring point, the air compressor first-level water separator liquid level measuring point, the second-level air compressor intake buffer liquid level measuring point, the air compressor second-level water separator liquid level measuring point, the air compressor bearing vibration measuring point, and the air compressor motor bearing vibration measuring point, and the preset air compressor start sub-logic;

[0066] The control module is used to determine whether the air compressor group has an abnormality based on the second air compressor status sub-data transmitted by the first-stage air compressor intake pressure measuring point, the second-stage air compressor exhaust pressure measuring point, the air compressor lubricating oil main pipe oil supply pressure measuring point, the first-stage air compressor exhaust temperature measuring point, the second-stage air compressor exhaust temperature measuring point, the air compressor bearing temperature measuring point, the air compressor lubricating oil main pipe oil supply temperature measuring point, the air compressor lubricating oil tank oil temperature measuring point, the air compressor motor bearing temperature measuring point, the air compressor motor stator winding temperature measuring point, the air compressor oil filter differential pressure measuring point, the air compressor oil cooler cooling water return total flow measuring point, the air compressor bearing vibration measuring point and the air compressor motor bearing vibration measuring point, and the preset air compressor early warning sub-logic.

[0067] In some optional methods of this embodiment, the control module is used to determine whether there is an abnormality in the air purifier based on the air purifier outlet air CO2 content measurement point, the air inlet constant temperature electric heater flow measurement point, the air purifier inlet and outlet differential pressure measurement point, the air outlet differential pressure measurement point when the two screens are pressurized, the screen 1 air outlet pressure measurement point, the screen 2 air outlet pressure measurement point, the screen 1 air inlet temperature measurement point, the screen 2 air inlet temperature measurement point and the air purifier status data transmitted by the electric heater internal temperature measurement point and the preset air purifier control logic.

[0068] In some optional aspects of this embodiment, the preset circulation booster control logic includes a preset circulation booster start sub-logic and a preset circulation booster warning sub-logic, wherein:

[0069] The control module is used to determine whether the circulating supercharger unit can be started according to the first circulating supercharger status sub-data transmitted by the circulating supercharger bearing vibration measurement point and the circulating supercharger motor bearing vibration measurement point and the preset circulating supercharger start sub-logic;

[0070] The control module is used to determine whether the circulating booster unit has an abnormality based on the circulating booster lubricating oil main pipe oil supply pressure measuring point, the circulating booster lubricating oil main pipe oil supply temperature measuring point, the circulating booster oil filter differential pressure measuring point, the circulating booster oil cooler cooling water return total flow measuring point, the secondary circulating booster exhaust pressure measuring point, the primary circulating booster exhaust temperature measuring point, the secondary circulating booster exhaust temperature measuring point, the circulating booster bearing temperature measuring point, the circulating booster motor bearing temperature measuring point, the circulating booster motor stator winding temperature measuring point, the circulating booster lubricating oil tank oil temperature measuring point, the circulating booster bearing vibration measuring point, and the second circulating booster status sub-data transmitted by the circulating booster motor bearing vibration measuring point and the preset circulating booster early warning sub-logic.

[0071] At this point, the present invention proposes a protection control device and method for the air compression system of a compressed air energy storage power station. By classifying and considering the complex measuring points and valves of the system and designing them separately, the risks of "false operation" and "refusal to operate" of the equipment protection are fully balanced, the control logic of the start permission and protection tripping of the main equipment is optimized, the control logic of the matching lubricating oil auxiliary oil pump and the related control valve interlock start and stop (switch) is targetedly designed, and the protection control logic between each device is scientifically and reasonably expanded. By applying the technical solution of the present invention, the safe and efficient operation of the air compression system of the compressed air energy storage power station from startup to full load can be effectively guaranteed, while ensuring the safety of the unit operation, the degree of automation of the equipment operation is improved, the workload of the operating personnel is reduced, and the mistakes that may be caused by manual judgment of equipment failure are prevented, so as to ensure the safe and stable operation of the unit after the application of the new technology to the greatest extent.

[0072] Next, the technical solution of this application is described in detail, specifically:

[0073] like Figure 1 As shown in the figure, the air compression system consists of four parts: air filter, air compressor, air purifier and circulating booster; Figure 3 and Figure 5 As shown in the figure, the air compressor and the circulating booster are divided into two stages. Inlet and exhaust buffers are arranged before and after each stage of the compressor, and a condenser (cooler) and a moisture separator are arranged in sequence downstream of each stage of the exhaust buffer. Figure 4 As shown in the figure, the air compressor auxiliary equipment mainly includes auxiliary oil pump, coaxial oil pump, oil cooler, oil filter, constant temperature electric heater and lubricating oil tank; Figure 5 As shown, the air purifier is equipped with an electric heater for regeneration.

[0074] The protection and control device for the air compression system of this embodiment specifically includes the following devices and measurement points:

[0075] like Figure 3As shown, the equipment includes: a back-blowing self-cleaning regulating valve 11 from the air purifier outlet to the air filter inlet, a condensate blowing isolation valve 12 for the air compressor first-stage moisture separator, a condensate blowing isolation valve 13 for the second-stage air compressor inlet buffer, a condensate blowing isolation valve 14 for the air compressor second-stage moisture separator, an air compressor outlet regulating valve 15, an air compressor outlet vent or reflux regulating valve 16, and a back-blowing self-cleaning regulating valve 17 for the compressed air system for instruments / factories to the air filter inlet.

[0076] Figure 3 The measuring points include: air filter differential pressure PD1 (i.e. the aforementioned first differential pressure measuring point), 1st stage air compressor inlet pressure P1 (i.e. the aforementioned first stage air compressor inlet pressure measuring point), 1st stage air compressor exhaust pressure P2 (i.e. the aforementioned first stage air compressor exhaust pressure measuring point), 2nd stage air compressor exhaust pressure P3 (i.e. the aforementioned second stage air compressor exhaust pressure measuring point), 1st stage air compressor inlet temperature T1 (i.e. the aforementioned first stage air compressor inlet temperature measuring point), 1st stage air compressor exhaust temperature T2 (i.e. the aforementioned first stage air compressor exhaust temperature measuring point), 2nd stage air compressor inlet temperature T3 (i.e. the aforementioned second stage air compressor exhaust temperature measuring point), The measuring points are as follows: air compressor inlet temperature measuring point), 2nd stage air compressor exhaust temperature T4 (i.e. the aforementioned 2nd stage air compressor exhaust temperature measuring point), 2nd stage cooler exhaust temperature T5 (i.e. the aforementioned 2nd stage cooler exhaust temperature measuring point), air compressor 1st stage moisture separator liquid level L1 (i.e. the aforementioned air compressor 1st stage moisture separator liquid level measuring point), 2nd stage air compressor inlet buffer liquid level L2 (i.e. the aforementioned 2nd stage air compressor inlet buffer liquid level measuring point), air compressor 2nd stage moisture separator liquid level L3 (i.e. the aforementioned air compressor 2nd stage moisture separator liquid level measuring point) and 2nd stage air compressor outlet flow F1 (i.e. the aforementioned 2nd stage air compressor outlet flow measuring point).

[0077] Further Figure 3 To introduce, such as Figure 3 As shown, the atmosphere first passes through the air filter, filter-muffler, and first-stage air compressor inlet buffer, producing dry, clean air at a temperature and pressure that meets the first-stage air compressor inlet requirements. It then enters the first-stage air compressor for pressurization and temperature increase. Its outlet air then passes through the first-stage air compressor outlet buffer, first-stage cooler, first-stage moisture separator, and second-stage air compressor inlet buffer, producing dry, clean air at a temperature and pressure that meets the second-stage air compressor inlet requirements. Finally, it enters the second-stage air compressor for pressurization and temperature increase. Its outlet air then passes through the second-stage air compressor outlet buffer, second-stage cooler, and second-stage moisture separator, producing dry, clean air at a temperature and pressure that meets the air purifier inlet requirements. It then passes through the check valve and air compressor outlet regulating valve 15 (the air compressor outlet bleed or reflux regulating valve 16 remains closed) before being delivered to the air purifier inlet.

[0078] The main functions of the air filter include improving the quality of incoming air under various humidity and contamination conditions, meeting the dryness and cleanliness requirements of the air compressor's incoming air. When the air filter differential pressure is too large, the pulse backwash self-cleaning system can be activated to reduce the air filter differential pressure, maintain the air compressor's inlet pressure within a certain range, and ensure unit performance. When the external ambient temperature is too low, the internal anti-icing system can be activated to keep the air compressor's inlet temperature within a certain range to ensure unit performance. Internal components include but are not limited to individual devices such as wind and rain shields, anti-flocculation nets, bird nets, inertial dehumidifiers, anti-icing systems, and pulse backwash self-cleaning systems. An air filter differential pressure measuring point PD1 is located at the inlet and outlet of the air filter to monitor and control whether the air filter differential pressure exceeds the limit.

[0079] The main function of the filter silencer is to reduce or eliminate the low-frequency noise and other frequency noise of the air compressor.

[0080] To meet the minimum power consumption requirement, the air compressor is divided into two stages, whose function is to compress atmospheric air to medium pressure and high temperature to meet the inlet pressure requirements of the circulating booster. The air compressor is an integrated centrifugal compressor with variable frequency starting to accommodate frequent start-stop operation requirements. The inlet and outlet of the first-stage air compressor are equipped with pressure measuring points (such as P1 and P2) and temperature measuring points (such as T1 and T2) to monitor and control the operating status of the first-stage air compressor; the inlet and outlet of the second-stage air compressor are equipped with temperature measuring points (such as T3 and T4) to monitor and control the operating status of the second-stage air compressor. The outlet of the second-stage moisture separator is equipped with a pressure measuring point (such as P3) and a temperature measuring point (such as T5) to monitor and control the air supply status of the air compressor to the air purifier. A flow measuring point (such as F1) is arranged after the air compressor outlet regulating valve 15 to monitor and control the air compressor outlet flow.

[0081] Buffers are placed at the inlet and outlet of each stage of the air compressor to ensure that pressure fluctuations at the inlet and outlet of each stage of the air compressor are limited to a certain range. Since the compression of each stage of the air compressor increases the internal energy of the air, resulting in an increase in air pressure and temperature, and in order to store and utilize this internal energy during the energy release phase, a heat storage medium is required to cool the air and recover the heat energy. Therefore, a cooler is placed downstream of the outlet buffer of each stage of the air compressor. In the heat storage system, the heat storage medium (water, heat transfer oil, or molten salt) at room temperature enters the low-temperature heat storage medium pump from the low-temperature heat storage medium tank for pressurization, and is then sent in parallel to the first-stage cooler and the second-stage cooler to cool the air at the outlet of the first-stage air compressor and the second-stage air compressor after being treated by the buffer. At the same time, the low-temperature heat storage medium is heated. The heated heat storage medium is collected and sent to the high-temperature heat storage medium tank, completing the storage of heat energy during the air compression process.

[0082] In addition, a moisture separator is arranged after each stage of the cooler to remove the moisture precipitated after the compressed air is cooled. Liquid level measuring points (such as L1, L2 and L3) are arranged in each stage of the moisture separator and the second-stage air compressor inlet buffer. When L1, L2 and L3 are higher than the warning value, the corresponding condensate blow-off isolation valve (such as the air compressor first-stage moisture separator condensate blow-off isolation valve 12, the second-stage air compressor intake buffer condensate blow-off isolation valve 13, and the air compressor second-stage moisture separator condensate blow-off isolation valve 14) is interlocked and opened; when L1, L2 and L3 drop to a low value, the corresponding condensate blow-off isolation valve (such as the air compressor first-stage moisture separator condensate blow-off isolation valve 12, the second-stage air compressor intake buffer condensate blow-off isolation valve 13, and the air compressor second-stage moisture separator condensate blow-off isolation valve 14) is reset and closed.

[0083] Figure 4 The measuring points include: air compressor oil filter differential pressure PD2, air compressor lubricating oil main pipe oil supply pressure P4, air compressor oil cooler cooling water return total flow F2, air compressor bearing temperature T6~T8, air compressor lubricating oil main pipe oil supply temperature T9, air compressor lubricating oil tank oil temperature T10, air compressor motor bearing temperature T11~T12, air compressor motor stator winding temperature T13~T15, air compressor bearing vibration Y1~Y3 and air compressor motor bearing vibration Y4~Y5.

[0084] Further Figure 4 To introduce, such as Figure 4 As shown in the figure, the first-stage air compressor and the second-stage air compressor are coaxially arranged and equipped with lubricating oil and circulating cooling water systems. The air compressor body is equipped with air compressor bearing temperature measuring points (such as T6 to T8) and air compressor bearing vibration measuring points (such as Y1 to Y3) to monitor and control the safe and reliable operation of the air compressor; the air compressor motor is equipped with air compressor motor bearing temperature measuring points (such as T11 and T12), air compressor motor stator winding temperature measuring points (such as T13 to T15) and air compressor motor bearing vibration measuring points (such as Y4 and Y5) to monitor and control the safe and reliable operation of the air compressor motor.

[0085] The lubricating oil system includes, but is not limited to, the lubricating oil tank, auxiliary oil pump, oil cooler, oil filter, coaxial oil pump, oil supply / return lines, auxiliary oil pump outlet check valve, auxiliary oil pump inlet / outlet isolation valves, auxiliary oil pump inlet filter, thermostatic electric heater, local instrument panel, and various remote instruments. The entire system forms a closed loop. Before the air compressor starts, the auxiliary oil pump is activated. Oil from the lubricating oil tank passes through the inlet filter and the auxiliary oil pump inlet isolation valve, where it is pressurized by the auxiliary oil pump. It is then fed to the oil cooler and oil filter for cooling and filtration, ultimately delivering it to the bearings of each stage of the air compressor at the specified pressure. Low-pressure return oil from each bearing returns to the lubricating oil tank for the next cycle. A coaxial oil pump is installed at the end of the air compressor shaft, connected in parallel with the auxiliary oil pump. When the air compressor speed reaches its rated speed and the coaxial oil pump output can meet the lubricating oil system's needs, the auxiliary oil pump is interlocked and shut down. When the air compressor stops, the auxiliary oil pump is interlocked and started again. Temperature measuring points (such as T10) are arranged in the lubricating oil tank to monitor and control the operating status of the constant temperature electric heater; differential pressure measuring points (such as PD2) are arranged at the inlet and outlet of the oil filter to monitor and control whether the differential pressure of the oil filter exceeds the limit; pressure measuring points (such as P4) and temperature measuring points (such as T9) are arranged on the lubricating oil main pipe at the oil filter outlet to monitor and control the oil supply status of the lubricating oil system to the air compressor.

[0086] The cooling medium of the oil cooler comes from the circulating cooling water system. A cooling water return total flow measurement point (such as F2) is arranged at the outlet of the circulating cooling water side of the oil cooler to monitor and control the lubricating oil cooling water supply status.

[0087] like Figure 5 As shown, the equipment includes: sieve 1 inlet isolation valve 21, sieve 2 inlet isolation valve 22, sieve 1 inlet pressure relief isolation valve 23, sieve 2 inlet pressure relief isolation valve 24, sieve 1 back-blowing gas outlet regulating valve 25, sieve 2 back-blowing gas outlet regulating valve 26, air purifier vent isolation valve 27, sieve 1, sieve 2 pressure balancing valve 28, sieve 1 outlet isolation valve 29, sieve 2 outlet isolation valve 210, sieve 1 back-blowing gas inlet regulating valve 211, sieve 2 back-blowing gas inlet regulating valve 212 , electric heater back-blowing air self-supply air intake regulating valve 213, electric heater back-blowing air external supply air intake regulating valve 214, circulating booster inlet isolation valve 215, circulating booster 3rd stage moisture separator condensate blow-off isolation valve 216, 2nd stage circulating booster intake buffer condensate blow-off isolation valve 217, circulating booster 4th stage moisture separator condensate blow-off isolation valve 218, circulating booster outlet vent or reflux regulating valve 219 and circulating booster outlet regulating valve 220.

[0088] Figure 5The measuring points include: air purifier inlet and outlet differential pressure PD3, air outlet differential pressure when two screens are pressurized PD4, screen 1 air outlet (regeneration air inlet) pressure P5; screen 2 air outlet (regeneration air inlet) pressure P6; 1st stage circulating booster intake pressure P7 (i.e. the aforementioned 1st stage circulating booster intake pressure measuring point); 1st stage circulating booster exhaust pressure P8 (i.e. the aforementioned 1st stage circulating booster exhaust pressure measuring point); 2nd stage circulating booster exhaust pressure P9 (i.e. the aforementioned 2nd stage circulating booster exhaust pressure measuring point); screen 1 air inlet (regeneration air outlet) temperature T16; screen 2 air inlet (regeneration air outlet) temperature T17; screen 1 air outlet (regeneration air inlet) temperature T18; screen 2 air outlet (Regeneration air inlet) temperature T19; air purifier outlet temperature T20; electric heater internal temperature T21; 1st stage (primary) circulating booster inlet temperature T22; 1st stage (primary) circulating booster exhaust temperature T23; 2nd stage (secondary) circulating booster inlet temperature T24; 2nd stage (secondary) circulating booster exhaust temperature T25; 4th stage (fourth stage) cooler exhaust temperature T26; circulating booster 3rd stage (third stage) water separator liquid level L4; 2nd stage (secondary) circulating booster inlet buffer liquid level L5; circulating booster 4th stage (fourth stage) water separator liquid level L6; air inlet constant temperature electric heater flow rate F3; 2nd stage (secondary) circulating booster outlet flow rate F4; air CO2 content A1 at air purifier outlet.

[0089] Further Figure 5 To introduce, such as Figure 3 and Figure 5As shown, the medium-pressure, high-temperature air at the outlet of the second-stage (secondary) air compressor is cooled by the second-stage (secondary) cooler, resulting in medium-pressure, ambient-temperature air. This air is then fed into the molecular sieves of the air purifier to remove water and carbon dioxide. If sieve 1 is operating and sieve 2 is on standby, the medium-pressure, ambient-temperature air passes sequentially through sieve 1 inlet isolation valve 21, sieve 1, and sieve 1 outlet isolation valve 29. If sieve 2 is operating and sieve 1 is on standby, the medium-pressure, ambient-temperature air passes sequentially through sieve 22, sieve 2, and sieve 2 outlet isolation valve 210. It then merges with the return air from the air liquefaction system and enters the circulating booster for further pressure and temperature increase. In the circulating booster, the air is first processed in sequence through the circulating booster inlet isolation valve 215, the circulating booster inlet filter and the first-stage circulating booster inlet buffer to obtain dry, clean air whose temperature and pressure meet the first-stage circulating booster inlet requirements; then it enters the first-stage circulating booster for pressurization and temperature increase, and its outlet air is processed in sequence through the first-stage circulating booster outlet buffer, the third-stage cooler, the first-stage moisture separator and the second-stage circulating booster inlet buffer to obtain dry, clean air whose temperature and pressure meet the second-stage circulating booster inlet requirements; finally it enters the second-stage circulating booster for pressurization and temperature increase, and its outlet air is processed in sequence through the second-stage circulating booster outlet buffer, the fourth-stage cooler and the second-stage moisture separator to obtain dry, clean air whose temperature and pressure meet the air liquefaction system inlet requirements, and then passes through the check valve and the circulating booster outlet regulating valve 220 (wherein the circulating booster outlet vent or reflux regulating valve 219 remains closed) and is sent to the inlet of the boosting expansion refrigeration unit in the air liquefaction system.

[0090] The main function of an air purifier is to remove impurities such as water, CO2, and trace hydrocarbons remaining in the cooled air at the outlet of the air compressor, and to prevent these impurities from condensing and solidifying in the low-temperature zone of the air liquefaction system, clogging pipes and equipment, and hindering the normal operation of the system. The dew point of the purified air drops below normal values (such as -65°C), and the CO2 content drops below normal values (such as 1ppm). An air purifier includes but is not limited to two alternating molecular sieves, an electric heater, and several switching valves. When one molecular sieve is saturated with adsorption, the switching sequence of the switching valve is controlled to allow air to enter another molecular sieve for continued adsorption, while the original molecular sieve is depressurized to normal pressure and waits for regeneration. When screen 1 or screen 2 is regenerated, if the expansion power generation system is running, the electric heater back-blowing air external supply air intake regulating valve 214 is opened, and the exhaust gas of the expansion power generation system enters the electric heater through the electric heater back-blowing air external supply air intake regulating valve 214 to be heated to form regenerated gas; if the expansion power generation system is shut down, the electric heater back-blowing air self-supply air intake regulating valve 213 is opened, and the air at the air purifier outlet enters the electric heater through the electric heater back-blowing air self-supply air intake regulating valve 213 to be heated to form regenerated gas. When sieve 1 is regenerated and sieve 2 is working, the sieve 1 inlet isolation valve 21 and the sieve 1 outlet isolation valve 29 are closed, and the regenerated gas passes through the sieve 1 back-blowing gas inlet regulating valve 211, sieve 1, the sieve 1 back-blowing gas outlet regulating valve 25 and the air purifier vent isolation valve 27 in sequence to regenerate and back-blow sieve 1; when sieve 2 is regenerated and sieve 1 is working, the sieve 2 inlet isolation valve 22 and the sieve 2 outlet isolation valve 210 are closed, and the regenerated gas passes through the sieve 2 back-blowing gas inlet regulating valve 212, sieve 2, the sieve 2 back-blowing gas outlet regulating valve 26 and the air purifier vent isolation valve 27 in sequence to regenerate and back-blow sieve 2. The inlet / outlet of screen 1 is equipped with pressure measuring points (such as P5) and temperature measuring points (such as T16 and T18) to monitor and control the working and regeneration status of screen 1; the inlet / outlet of screen 2 is equipped with pressure measuring points (such as P6) and temperature measuring points (such as T17 and T19) to monitor and control the working and regeneration status of screen 2; a differential pressure measuring point (such as PD4) is arranged between screens 1 and 2 to monitor and control the pressure deviation between screens 1 and 2. Among them, when screen 1 is regenerated, the air outlet pressure P5 of screen 1 is controlled by the back-blowing air outlet regulating valve 25 of screen 1. If the air outlet pressure P5 of screen 1 exceeds the limit, the screen 1 inlet pressure relief isolation valve 23 is interlocked to be opened. After the air outlet pressure P5 of screen 1 is reset, the screen 1 inlet pressure relief isolation valve 23 is closed; when screen 2 is regenerated, the air outlet pressure P6 of screen 2 is controlled by the back-blowing air outlet regulating valve 26 of screen 2. If the air outlet pressure P6 of screen 2 exceeds the limit, the screen 2 inlet pressure relief isolation valve 24 is interlocked to be opened. After the air outlet pressure P6 of screen 2 is reset, the screen 2 inlet pressure relief isolation valve 24 is closed; when the two screens are pressurized, if the air outlet differential pressure PD4 exceeds the limit, the screen 1 and screen 2 pressure balancing valves 28 are interlocked to be opened. When the two screens are pressurized, the air outlet differential pressure PD4 is reset, and the screen 1 and screen 2 pressure balancing valves 28 are closed.Flow rate measuring points (such as F3) and temperature measuring points (such as T21) are located at the inlet and body of the electric heater to monitor and control the supply status of the regeneration gas. A carbon dioxide concentration measuring point (such as A1) and a temperature measuring point (such as T20) are located at the outlet of the air purifier to monitor and control the quality of the air supplied to the circulating booster inlet.

[0091] In order to meet the minimum power consumption requirement, the circulating booster is divided into two stages. Its function is to compress the air outlet of the air purifier to high pressure and high temperature to meet the inlet pressure requirement of the boost expansion refrigeration unit in the air liquefaction system. The circulating booster is an integrated centrifugal compressor with variable frequency start to adapt to the requirements of frequent start and stop operation. Figure 5 As shown, the inlet and outlet of the first-stage circulating booster are equipped with pressure measuring points (such as P7 and P8) and temperature measuring points (such as T22 and T23) to monitor and control the operating status of the first-stage circulating booster. The inlet and outlet of the second-stage circulating booster are equipped with temperature measuring points (such as T24 and T25) to monitor and control the operating status of the second-stage circulating booster. The outlet of the fourth-stage moisture separator is equipped with pressure measuring points (such as P9) and temperature measuring points (such as T26) to monitor and control the air supply status of the circulating booster to the booster expansion refrigeration unit in the air liquefaction system. A flow measuring point (such as F4) is arranged after the circulating booster outlet regulating valve 220 to monitor and control the circulating booster outlet flow.

[0092] The inlet filter of the circulating booster is used to prevent large impurities from entering the circulating booster and changing its internal structure. Buffers are installed at the inlet and outlet of each stage of the circulating booster to ensure that the pressure fluctuations of the inlet and outlet of each stage of the circulating booster are limited to a certain range.

[0093] Since compression by each stage of the circulating booster increases the internal energy of the air, causing the air pressure and temperature to rise, a heat storage medium is required to cool the air and recover the heat energy in order to store and utilize this internal energy during the energy release stage. Therefore, a cooler is arranged downstream of the buffer at the outlet of each stage of the circulating booster. In the heat storage system, the heat storage medium (water, heat transfer oil, or molten salt) at room temperature enters the low-temperature heat storage medium pump from the low-temperature heat storage medium tank for pressurization, and is then sent in parallel to the 3rd and 4th stage coolers to cool the air at the outlet of the 1st and 2nd stage circulating boosters after being treated by the buffer, while the low-temperature heat storage medium is heated at the same time. The heated heat storage medium is collected and sent to the high-temperature heat storage medium tank, completing the storage of heat energy during the air compression process.

[0094] A moisture separator is arranged after each stage of the cooler to remove the moisture precipitated after the compressed air is cooled. Liquid level measuring points (such as L4, L5 and L6) are arranged in each stage of the moisture separator and the inlet buffer of the 2nd stage circulating booster. When L4, L5 and L6 are higher than the warning value, the corresponding condensate blow-off isolation valve (the condensate blow-off isolation valve 216 of the 3rd stage moisture separator of the circulating booster, the condensate blow-off isolation valve 217 of the 2nd stage circulating booster air intake buffer and the condensate blow-off isolation valve 218 of the 4th stage moisture separator of the circulating booster) is interlocked and opened; when L4, L5 and L6 drop to the low value, the corresponding condensate blow-off isolation valve (such as the condensate blow-off isolation valve 216 of the 3rd stage moisture separator of the circulating booster, the condensate blow-off isolation valve 217 of the 2nd stage circulating booster air intake buffer and the condensate blow-off isolation valve 218 of the 4th stage moisture separator of the circulating booster) is reset and closed.

[0095] Figure 6 The measuring points include: circulating booster oil filter differential pressure PD5, circulating booster lubricating oil main pipe oil supply pressure P10, circulating booster oil cooler cooling water return total flow F5, circulating booster bearing temperature T27~T29, circulating booster lubricating oil main pipe oil supply temperature T30, circulating booster lubricating oil tank oil temperature T31, circulating booster motor bearing temperature T32, T33, circulating booster motor stator winding temperature T34~T36, circulating booster bearing vibration Y6~Y8 and circulating booster motor bearing vibration Y9, Y10.

[0096] Further Figure 6 To introduce: Figure 6 As shown in the figure, the first-stage and second-stage circulating boosters are coaxially arranged and equipped with lubricating oil and circulating cooling water systems. The circulating booster body is equipped with circulating booster bearing temperature measurement points (such as T27 to T29) and circulating booster bearing vibration measurement points (such as Y6 to Y8) to monitor and control the safe and reliable operation of the circulating booster. The circulating booster motor is equipped with circulating booster motor bearing temperature measurement points (such as T32 and T33), circulating booster motor stator winding temperature measurement points (such as T34 to T36), and circulating booster motor bearing vibration measurement points (such as Y9 and Y10) to monitor and control the safe and reliable operation of the circulating booster motor.

[0097] The lubricating oil system includes, but is not limited to, the lubricating oil tank, auxiliary oil pump, oil cooler, oil filter, coaxial oil pump, supply / return oil piping, auxiliary oil pump outlet check valve, auxiliary oil pump inlet / outlet isolation valves, auxiliary oil pump inlet filter, thermostatic electric heater, local instrument panel, and various remote instruments. The entire system forms a closed loop. Before the circulating booster is started, the auxiliary oil pump is activated. The oil in the lubricating oil tank passes through the inlet filter and the auxiliary oil pump inlet isolation valve to the auxiliary oil pump for pressurization. It is then fed to the oil cooler and oil filter for cooling and filtration, ultimately delivering it to the bearings of each stage of the circulating booster at the specified pressure. The low-pressure return oil from each bearing returns to the lubricating oil tank for the next cycle. A coaxial oil pump is installed at the end of the circulating booster shaft system, connected in parallel with the auxiliary oil pump. When the circulating booster speed reaches the rated value and the coaxial oil pump output can meet the lubricating oil system's needs, the auxiliary oil pump is interlocked and shut down. When the circulating booster is shut down, the auxiliary oil pump is interlocked and started. Temperature measuring points (such as T31) are located within the lubricating oil tank to monitor and control the operating status of the thermostatic electric heater. Differential pressure measuring points (such as PD5) are located at the inlet and outlet of the oil filter to monitor and control whether the oil filter differential pressure exceeds the limit. Pressure measuring points (such as P10) and temperature measuring points (such as T30) are located on the lubricating oil main pipe at the oil filter outlet to monitor and control the lubricating oil system's oil supply to the circulating booster.

[0098] The cooling medium of the oil cooler comes from the circulating cooling water system. A cooling water return total flow measurement point (such as F5) is arranged at the outlet of the circulating cooling water side of the oil cooler to monitor and control the supply status of the lubricating oil cooling water.

[0099] It should be noted that in this application, in order to simplify the description, P1 represents the 1st-stage air compressor inlet pressure measuring point and the 1st-stage air compressor inlet pressure corresponding to the measuring point; T1 represents the 1st-stage air compressor inlet temperature measuring point and the 1st-stage air compressor inlet temperature corresponding to the measuring point; L1 represents the 1st-stage air compressor moisture divider liquid level measuring point and the 1st-stage air compressor moisture divider liquid level corresponding to the measuring point; the numbers of the remaining measuring points are similar, and this application will not go into details here.

[0100] Furthermore, the air compressor protection control strategy (i.e., the preset air compressor control logic) is described:

[0101] First, preset air compressor start-up logic: If all the following conditions are met, the air compressor is allowed to start:

[0102] (1) All thermal measurement point conditions are met: including air compressor related temperature, pressure, flow, speed, shaft displacement, expansion difference, eccentricity, vibration, liquid level, load and other measurement points and related valves (such as open, close, valve position feedback, etc.), equipment speed control devices (such as hydraulic coupling scoop tube valve position, inverter frequency, etc.) and other feedback points are not bad points; (2) The air purifier has met the startup conditions, and the air purifier automatic switching program start feedback signal has been triggered and the cut-off feedback signal has not been triggered; (3) The air compressor operation feedback signal in the instrument / factory compressed air system has been triggered and the shutdown feedback signal has not been triggered, and the pressure of the air supply main pipe of the instrument / factory compressed air system has reached the preset pressure normal value (such as 0.75MPa.a); (4) The air filter start feedback signal has been triggered and the cut-off feedback signal has not been triggered, and the air filter differential pressure PD1 ≤ the preset differential pressure normal value (such as 2kPa); (5) The air compressor oil filter differential pressure PD2 ≤ the preset differential pressure normal value (such as 50kPa.a); (6) The oil supply pressure P4 of the lubricating oil main pipe of the air compressor is ≥ the preset normal pressure value (such as 0.2 MPa.g); (7) The oil temperature T10 of the lubricating oil tank of the air compressor is ≥ the preset low temperature value (such as 5°C); (8) The closing feedback signal of the air compressor outlet regulating valve 15 has been triggered and the opening feedback signal has not been triggered; (9) The opening feedback signal of the air compressor outlet vent or return regulating valve 16 has been triggered and the closing feedback signal has not been triggered; (10) The total return flow rate of the cooling water of the air compressor cooler F2 is ≥ the preset normal flow rate (such as 7 t / h); (11) The liquid level L1 of the first-stage water separator of the air compressor and the liquid level L2 of the air compressor intake buffer of the second-stage water separator of the air compressor are ≤ the preset normal liquid level value (such as 50 mm) and the liquid level L3 of the second-stage water separator of the air compressor is ≤ the preset normal liquid level value (such as 60 mm); (12) Y1~Y5 are ≤ the preset vibration value (such as 10 mm / s), where Y1~Y3 are the vibration values of the air compressor bearings and Y4~Y5 are the vibration values of the air compressor motor bearings.

[0103] When all the above conditions are met, the air compressor start execution button is activated from the prohibited state to the operable state. When the operator clicks the button, the air compressor starts.

[0104] Second, the pre-set air compressor warning sub-logic: the air compressor body parameter exceeds the limit and triggers the warning conditions as follows: (1) The air compressor intake pressure P1 of the first stage is ≤ the preset pressure lower value (such as -5kPa.g), which triggers the warning. The condition takes effect after the air compressor operation feedback signal has been triggered and the shutdown feedback signal has not been triggered for 40s; (2) The air compressor exhaust pressure P3 of the second stage is ≥ the preset pressure higher value (such as 0.8MPa.a), which triggers the warning; (3) The air compressor lubricating oil main pipe supply pressure P4 is ≤ the preset pressure lower value (such as 0.18MPa.g), which triggers the warning; (4) The air compressor exhaust temperature T2 of the first stage is ≥ the preset temperature higher value (such as 155℃), which triggers the warning; (5) The air compressor exhaust temperature T4 of the second stage is ≥ the preset temperature higher value (such as 160℃), which triggers the warning; (6) The air compressor bearing temperature T6~T8 is ≥ the preset temperature higher value (such as 70℃), which triggers the warning; (7) The air compressor lubricating oil main pipe oil supply temperature T9 ≥ the preset temperature higher than 1 value (such as 50℃) triggers an early warning; (8) The air compressor lubricating oil tank oil temperature T10 ≥ the preset temperature higher than 1 value (such as 60℃) triggers an early warning; (9) The air compressor motor bearing temperature T11, T12 ≥ the preset temperature higher than 1 value (such as 90℃) triggers an early warning; (10) The air compressor motor stator winding temperature T13~T15 ≥ the preset temperature higher than 1 value (such as 140℃) triggers an early warning; (11) The air compressor oil filter differential pressure PD2 ≥ the preset differential pressure high value (such as 100kPa) triggers an early warning; (12) The air compressor cooler cooling water return water total flow F2 ≤ the preset flow lower than 1 value (such as 6t / h) triggers an early warning; (13) Y1~Y5 ≥ the preset vibration higher than 1 value (such as 20mm / s) triggers an early warning, where Y1~Y3 are the air compressor bearing vibration values, and Y4~Y5 are the air compressor motor bearing vibration values.

[0105] Third, the air compressor body parameter exceeds the limit and triggers the warning interlock shutdown conditions, which are as follows: (1) The 1st-stage air compressor inlet pressure P1 ≤ the preset pressure low 2 value (such as -10kPa.g) triggers the warning, and at the same time the auxiliary oil pump interlock starts and the air compressor interlocks and shuts down. This condition takes effect after the air compressor operation feedback signal has been triggered and the shutdown feedback signal has not been triggered for a preset time (such as 40s); (2) The 2nd-stage air compressor exhaust pressure P3 ≥ the preset pressure high 3 value (such as 0.85MPa.a) triggers the warning, and at the same time Auxiliary oil pump interlock starts, air compressor interlock stops, 1-6 interlock opens; (3) Air compressor lubricating oil main pipe oil supply pressure P4 ≤ preset pressure low 2 values (such as 0.15MPa.g) triggers an early warning, and at the same time, the auxiliary oil pump interlock starts and the air compressor interlock stops; (4) Air compressor bearing temperature T6~T8 ≥ preset temperature high 2 values (such as 75℃) triggers an early warning, and at the same time, the auxiliary oil pump interlock starts and the air compressor interlock stops; (5) Air compressor lubricating oil main pipe oil supply temperature T9 ≥ preset temperature high 2 values (6) The air compressor motor bearing temperature T11, T12 ≥ the preset temperature higher than 2 values (such as 95°C) triggers an early warning, and the auxiliary oil pump interlock starts and the air compressor interlocks and stops; (7) The air compressor motor stator winding temperature T13~T15 ≥ the preset temperature higher than 2 values (such as 145°C) triggers an early warning, and the auxiliary oil pump interlock starts and the air compressor interlocks and stops; (8) The air compressor cooler cooling water return The total water flow F2 ≤ the preset flow low 2 value (e.g., 5t / h) triggers an early warning, and the auxiliary oil pump interlock starts and the air compressor interlock stops at the same time; (9) Y1~Y5 ≥ the preset vibration high 2 value (e.g., 28mm / s) triggers an early warning, and the auxiliary oil pump interlock starts and the air compressor interlock stops at the same time, where Y1~Y3 are the vibration values of the air compressor bearings, and Y4~Y5 are the vibration values of the air compressor motor bearings; (10) The emergency stop button triggers an early warning, and the auxiliary oil pump interlock starts and the air compressor interlock stops at the same time;

[0106] The air compressor shutdown feedback signal has been triggered and the operation feedback signal has not been triggered. The interlock opens the air compressor outlet discharge or reflux regulating valve 16, the interlock closes the air compressor outlet regulating valve 15, and the interlock stops the auxiliary oil pump after a preset time (such as 5 minutes).

[0107] Fourth, other equipment triggers the air compressor interlock shutdown conditions as follows: (1) The shutdown feedback signal of the boost expansion refrigeration unit in the air liquefaction system has been triggered and the operation feedback signal has not been triggered, triggering the auxiliary oil pump interlock start and the air compressor interlock shutdown; (2) The air supply main pipe pressure of the instrument / factory compressed air system is ≤ the preset pressure low value (such as 0.4MPa.a), and the auxiliary oil pump interlock start and the air compressor interlock shutdown are triggered after a preset time (such as 5s); (3) The shutdown feedback signal of all low-temperature heat storage medium pumps in the heat storage system has been triggered and the operation feedback signal has not been triggered, and the auxiliary oil pump interlock start and the air compressor interlock shutdown are triggered after a preset time (such as 5s); (4) The shutdown feedback signal of all circulating cooling water pumps in the circulating cooling water system has been triggered and the operation feedback signal has not been triggered, and the auxiliary oil pump interlock start and the air compressor interlock shutdown are triggered after a preset time (such as 5s).

[0108] The air compressor shutdown feedback signal has been triggered and the operation feedback signal has not been triggered. The interlock opens the air compressor outlet discharge or reflux regulating valve 16, the interlock closes the air compressor outlet regulating valve 15, and the interlock stops the auxiliary oil pump after a preset delay (such as 5 minutes).

[0109] Fifth, the air compressor shutdown triggers the interlocking action conditions of other equipment, as follows: (1) Interlock to open the air compressor outlet discharge or return flow regulating valve 16; (2) Interlock to close the air compressor outlet regulating valve 15; (3) Interlock to open the circulating booster outlet discharge or return flow regulating valve 219; (4) Interlock the circulating booster shutdown; (5) Interlock to suspend the air purifier switching program, and the status of each valve in the air purifier remains unchanged; (6) Interlock to open the return flow regulating valve of the boost expansion refrigeration unit in the air liquefaction system, interlock to close the inlet emergency isolation valve of the boost expansion refrigeration unit in the air liquefaction system, and interlock to shut down the boost expansion refrigeration unit in the air liquefaction system; (7) Interlock to close the high-pressure liquefied air throttling regulating valve in the air liquefaction system; (8) Interlock to close the liquefied air storage regulating valve in the air liquefaction system.

[0110] Sixth, other triggering warning interlock conditions of air compressor are as follows: (1) The auxiliary oil pump needs to be manually started within a preset time (such as 5 minutes) before the air compressor starts. The air compressor operation feedback signal has been triggered and the shutdown feedback signal has not been triggered after the preset time (such as 1 minute), and the air compressor lubricating oil main pipe oil supply pressure P4 ≥ the preset pressure normal value (such as 0.2MPa.g), then the auxiliary oil pump interlock shutdown is triggered; (2) The air compressor lubricating oil main pipe oil supply pressure P4 ≤ the preset pressure lower value (such as 0.18MPa.g), then the auxiliary oil pump interlock start is triggered; (3) The exhaust pressure P3 of the 2nd stage air compressor ≥ the preset pressure higher value (such as 0.78MPa), then the air compressor outlet discharge or reflux adjustment The automatic tracking value of the exhaust pressure P3 of the second-stage air compressor of valve 16 drops to the preset normal value (such as 0.76MPa.a); (4) The auxiliary oil pump operation feedback signal has been triggered and the shutdown feedback signal has not been triggered. At the same time, the oil temperature T10 of the air compressor lubricating oil tank is less than the preset low temperature value (such as 5°C), the thermostatic electric heater interlock is started; (5) The oil temperature T10 of the air compressor lubricating oil tank is greater than or equal to the preset normal temperature value (such as 10°C), or the air compressor operation feedback signal has been triggered and the shutdown feedback signal has not been triggered, the thermostatic electric heater interlock is shut down; (6) The liquid level L1 of the first-stage water separator of the air compressor is greater than or equal to the preset high liquid level (such as 200mm), triggering the warning and interlocking the opening of the condensate blow-off isolation of the first-stage water separator of the air compressor. If the liquid level L1 of the air compressor first-stage water separator is less than the preset liquid level low value (such as 25mm), the air compressor first-stage water separator condensate blowing isolation valve 12 is interlocked and closed; (7) The liquid level L2 of the second-stage air compressor intake buffer is greater than or equal to the preset liquid level high value (such as 200mm), the warning is triggered and the second-stage air compressor intake buffer condensate blowing isolation valve 13 is interlocked and opened; if the liquid level L2 of the second-stage air compressor intake buffer is less than the preset liquid level low value (such as 25mm), the second-stage air compressor intake buffer condensate blowing isolation valve 13 is interlocked and closed; (8) The liquid level L3 of the air compressor second-stage water separator is greater than or equal to the preset liquid level high value (such as 250mm), the warning is triggered and the second-stage air compressor intake buffer condensate blowing isolation valve 13 is interlocked and opened. Blow off the isolation valve 14. If the liquid level L3 of the air compressor second-stage moisture separator is less than the preset low liquid level (such as 40mm), the interlock will close the air compressor second-stage moisture separator condensate blow-off isolation valve 14; (9) If the air filter differential pressure PD1 is greater than or equal to the preset high differential pressure value (such as 4kPa), the early warning will be triggered and the interlock will open the air purifier outlet to the air filter inlet back-blowing self-cleaning regulating valve 11 and the instrument / factory compressed air system to the air filter inlet back-blowing self-cleaning regulating valve 17; If the air filter differential pressure PD1 is less than or equal to the preset normal differential pressure value (such as 2kPa), the air purifier outlet to the air filter inlet back-blowing self-cleaning regulating valve 11 and the instrument / factory compressed air system to the air filter inlet back-blowing self-cleaning regulating valve 17 will be reset and closed.

[0111] Seventh, the automatic setting conditions of the air compressor are as follows: (1) After the air compressor operation feedback signal has been triggered and the shutdown feedback signal has not been triggered for a preset time (such as 1 minute), the air compressor outlet regulating valve 15 starts the pressure automatic control of the 1st stage circulating booster intake pressure P7 (the automatic tracking value can refer to 0.7MPa.a), and at the same time, the air compressor outlet bleed or reflux regulating valve 16 starts the pressure automatic control of the 2nd stage air compressor exhaust pressure P3 (the automatic tracking value can refer to 0.78MPa.a); (2) After the air compressor operation feedback signal has been triggered and the shutdown feedback signal has not been triggered, the air compressor inverter starts the flow automatic control of the 2nd stage air compressor outlet flow F1 (the automatic tracking value refers to the input power curve of the energy storage stage).

[0112] At this point, the preset air compressor control logic of the present application includes the preset air compressor start-up sub-logic and the preset air compressor early warning sub-logic, as well as the air compressor body parameter exceeding the limit triggering early warning interlocking shutdown conditions, other equipment triggering the air compressor large interlocking shutdown conditions, air compressor shutdown triggering other equipment interlocking action conditions, air compressor other triggering early warning interlocking conditions and air compressor automatic setting conditions.

[0113] Next, the air purifier protection control strategy (preset air purifier control logic) is explained:

[0114] First, the air purifier operating parameters exceed the limit and trigger the early warning interlock conditions as follows:

[0115] (1) The CO2 content A1 in the air outlet of the air purifier is ≥ the preset high concentration value (e.g. 1.5 ppm) and triggers an alarm;

[0116] (2) The air flow rate F3 into the constant temperature electric heater is less than the preset flow rate low 3 value (such as 160Nm 3 / h) triggers the early warning and interlocks to open the electric heater back-blowing air self-supply air intake regulating valve 213; the air inlet constant temperature electric heater flow F3 ≤ the preset flow low 2 value (180Nm 3 / h) triggers the early warning, and the electric heater is locked and started; the air flow rate F3 into the constant temperature electric heater is less than the preset flow rate low value (such as 220Nm 3 / h) triggers the warning; the air flow rate F3 into the constant temperature electric heater ≥ the preset flow rate high value (such as 1350Nm 3 / h) triggers an early warning and interlocks to stop the electric heater; (3) The air purifier inlet and outlet differential pressure PD3 ≥ the preset differential pressure high value 1 (such as 0.010MPa) triggers an early warning, the air purifier inlet and outlet differential pressure PD3 ≥ the preset differential pressure high value 2 (such as ≥0.015MPa) triggers an early warning and interlocks to open the air compressor outlet discharge or return flow regulating valve 16 and the circulating booster outlet discharge or return flow regulating valve 219; (4) When the two screens are pressurized, the air outlet differential pressure PD4 ≥ the preset differential pressure high value (such as 0 .75MPa) triggers the alarm and interlocks to open the screen 2 pressure balance valve 28. When the air outlet differential pressure PD4 of the two screens is increased and returns to the preset differential pressure normal value (such as 0.008MPa), the screen 2 pressure balance valve 28 is reset and closed; (5) When screen 2 is running and screen 1 is regenerated, when the screen 1 air outlet pressure P5 ≥ the preset pressure high value (such as 0.75MPa.g), the alarm is triggered and interlocked to open the screen 1 inlet pressure relief isolation valve 23. When the screen 1 air outlet pressure P5 returns to the preset pressure normal value, the screen 2 pressure balance valve 28 is reset and closed; (6) When screen 2 is running and screen 1 is regenerated, when the screen 1 air outlet pressure P5 ≥ the preset pressure high value (such as 0.75MPa.g), the alarm is triggered and interlocked to open the screen 1 inlet pressure relief isolation valve 23. (e.g. 0.010MPa.g), the inlet pressure relief isolation valve 23 of screen 1 is reset and closed; (6) when screen 1 is running and screen 2 is regenerating, when the air outlet pressure P6 of screen 2 is ≥ the preset high pressure value (e.g. 0.75MPa.g), the alarm is triggered and the interlock is opened to open the inlet pressure relief isolation valve 24 of screen 2. When the air outlet pressure P6 of screen 2 returns to the preset normal pressure value (e.g. 0.010MPa.g), the inlet pressure relief isolation valve 24 of screen 2 is reset and closed; (7) when the air inlet temperature T16 of screen 1 is ≥ the preset high pressure value A high value (such as 50°C) triggers an early warning; (8) The screen 2 air inlet temperature T17 ≥ the preset high value (such as 50°C) triggers an early warning; (9) The internal temperature of the electric heater T21 ≥ the preset temperature high 1 value (such as 300°C) triggers an early warning, and the internal temperature of the electric heater T21 ≥ the preset temperature high 2 value (such as 350°C) interlocks to stop the electric heater; (10) The exhaust of the expansion power generation system ≤ the preset temperature low value (such as 0°C) triggers an early warning and interlocks to close the electric heater back-blowing air external supply air intake regulating valve 214.

[0117] Second, the automatic control strategy of the air purifier is as follows: (1) The time program controller automatically controls the air purifier's boost, depressurization, heating, cooling, parallel connection, switching and other procedures; (2) The air inlet constant temperature electric heater flow F3 automatically controls the electric heater back-blowing air self-supply air inlet regulating valve 213 (refer to the air inlet constant temperature electric heater flow F3 automatic tracking value of the design working condition in spring and autumn = 260Nm 3 / h, summer air flow into the constant temperature electric heater F3 automatic tracking value = 350Nm 3 / h, the automatic tracking value of the air flow rate F3 entering the constant temperature electric heater in winter = 200Nm 3 / h).

[0118] Third, other equipment triggers the air purifier interlock shutdown conditions, as follows: (1) The air compressor shutdown feedback signal has been triggered and the operation feedback signal has not been triggered, the interlock suspends the air purifier switching program, and the status of each valve in the air purifier remains unchanged; (2) The circulating booster shutdown feedback signal has been triggered and the operation feedback signal has not been triggered, the interlock suspends the air purifier switching program, and the status of each valve in the air purifier remains unchanged.

[0119] Thus, the preset air purifier control logic of the present application includes the above-mentioned air purifier operating parameter exceeding limit triggering warning interlocking conditions, air purifier automatic control strategy and other equipment triggering air purifier major interlocking shutdown conditions.

[0120] Next, the circulating booster protection control strategy (preset circulating booster control logic) is explained:

[0121] First, preset the sub-logic of the circulating booster starter: if all the following conditions are met, the circulating booster is allowed to start, as follows: (1) All the thermal measurement point conditions are met: including the relevant measurement points of the circulating booster, such as temperature, pressure, flow, speed, shaft displacement, expansion difference, eccentricity, vibration, liquid level, load, etc., and the relevant valves (such as open, close, valve position feedback, etc.), equipment speed control devices (such as hydraulic coupling scoop tube valve position, inverter frequency, etc.) and other feedback points are not bad points; (2) The air compressor operation feedback signal in the instrument / factory compressed air system has been triggered and the shutdown feedback signal has not been triggered, At the same time, the pressure of the main pipe of the compressed air system for the instrument / plant reaches the preset normal pressure value (such as 0.75MPa.a); (3) the air compressor and air purifier operate normally; (4) the air purifier is activated and the CO2 content A1 of the air at the outlet of the air purifier is normal; (5) the liquefied cold box in the air liquefaction system is heated to a qualified standard; (6) the booster expansion refrigeration unit in the air liquefaction system is heated to a qualified standard and has the conditions for starting; (7) the oil supply pressure P10 of the circulating booster lubricating oil main pipe ≥ the preset normal pressure value (such as 0.2MPa.g); (8 ) The oil temperature of the circulating booster lubricating oil tank T31 ≥ the preset low temperature value (such as 5°C); (9) The closing feedback signal of the circulating booster inlet isolation valve 215 and the circulating booster outlet regulating valve 220 has been triggered and the opening feedback signal has not been triggered; (10) The opening feedback signal of the circulating booster outlet vent or return regulating valve 219 has been triggered and the closing feedback signal has not been triggered; (11) The total return flow rate of the cooling water of the circulating booster cooler F5 ≥ the preset normal flow rate (such as 7t / h); (12) The differential pressure of the circulating booster filter PD5 ≤ the preset normal pressure (such as 5 0kPa.a); (13) The liquid level of the circulating booster 3-stage water separator L4 and the liquid level of the 2-stage circulating booster air inlet buffer L5 are ≤ the preset liquid level normal value (such as 40mm) and the liquid level of the circulating booster 4-stage water separator L6 is ≤ the preset liquid level normal value (such as 50mm); (14) The electric heater operation feedback signal has been triggered and the shutdown feedback signal has not been triggered; (15) Y6~Y10 are ≤ the preset vibration value (such as 10mm / s), among which Y6~Y8 are the vibration values of the circulating booster bearings, and Y9 and Y10 are the vibration values of the circulating booster motor bearings.

[0122] When all the above conditions are met, the booster start execution button will be activated from the prohibited state to the operable state. When the operator clicks the button, the booster will start.

[0123] Second, the conditions for triggering the warning when the parameters of the circulating booster exceed the limit (the preset circulating booster warning sub-logic) are as follows: (1) The circulating booster lubricating oil main pipe supply pressure P10 ≤ the preset pressure low value (such as 0.18MPa.g) triggers the warning; (2) The circulating booster lubricating oil main pipe supply temperature T30 ≥ the preset temperature high value (such as 50℃) triggers the warning; (3) The circulating booster filter oil differential pressure PD5 ≥ the preset differential pressure high value (such as 100kPa) triggers the warning; (4) The circulating booster The total return flow rate of the oil cooler cooling water F5 ≤ the preset flow rate lower value (such as 6.5t / h) triggers the warning; (5) After the circulating booster operation feedback signal has been triggered and the shutdown feedback signal has not been triggered for a preset time (such as 50s), when the first-stage circulating booster intake pressure P7 ≤ the preset pressure lower value (such as 0.69MPa.a) or the first-stage circulating booster intake pressure P7 ≥ the preset pressure higher value (such as 0.79MPa.a) triggers the warning; (6) The second-stage circulating booster exhaust pressure P9 ≥ the preset pressure The pressure is higher than 2 values (such as 6.1MPa.a) and triggers an early warning; (7) the exhaust temperature of the 1st level (first level) circulating booster T23 ≥ the preset high temperature value (such as 145℃) triggers an early warning; (8) the exhaust temperature of the 2nd level (second level) circulating booster T25 ≥ the preset high temperature value (such as 145℃) triggers an early warning; (9) the bearing temperature of the circulating booster T27~T29 ≥ the preset high temperature value (such as 70℃) triggers an early warning; (10) the bearing temperature of the circulating booster motor T32, T33 ≥ the preset high temperature value 1 value (such as 90℃) triggers an early warning; (11) the stator winding temperature of the circulating booster motor T34~T36 ≥ the preset temperature high value 1 (such as 140℃) triggers an early warning; (12) the oil temperature of the circulating booster lubricating oil tank T31 ≥ the preset temperature high value (such as 60℃) triggers an early warning; (13) Y6~Y10 ≥ the preset vibration high value 1 (such as 20mm / s) triggers an early warning, among which Y6~Y8 are the vibration values of the circulating booster bearing, and Y9 and Y10 are the vibration values of the circulating booster motor bearing.

[0124] Third, the conditions for triggering the alarm interlock shutdown when the parameters of the circulating booster exceed the limit are as follows: (1) The oil supply pressure P10 of the circulating booster lubricating oil main pipe ≤ the preset pressure lower value 2 (such as 0.15MPa.g) triggers the alarm, and at the same time, the auxiliary oil pump interlock starts and the circulating booster interlocks and shuts down; (2) The oil supply temperature T30 of the circulating booster lubricating oil main pipe ≥ the preset temperature higher value 2 (such as 60℃) triggers the alarm, and at the same time, the auxiliary oil pump interlock starts and the circulating booster interlocks and shuts down; (3) The emergency stop button is activated to trigger the alarm, and at the same time, the auxiliary oil pump interlock starts and the circulating booster interlocks and shuts down. Interlock shutdown; (4) The exhaust pressure P9 of the 2nd stage circulating booster is ≥ the preset pressure high 3 value (such as 6.2MPa.a) to trigger the warning, and at the same time the auxiliary oil pump interlock is started, the circulating booster is interlocked and shut down, and the circulating booster outlet vent or reflux regulating valve 219 is interlocked and opened; (5) After the circulating booster operation feedback signal has been triggered and the shutdown feedback signal has not been triggered for a preset time (such as 50s), the intake pressure P7 of the 1st stage circulating booster is ≤ the preset pressure low 2 value (such as 0.64MPa.a) or the intake pressure P7 of the 1st stage circulating booster is ≥ the preset pressure high 2 value (such as 0 .84MPa.a), and at the same time, the auxiliary oil pump interlock starts and the circulating booster interlock stops; (6) The total return flow of cooling water of the circulating booster oil cooler F5 ≤ the preset flow low 2 value (such as 6t / h) triggers an early warning, and at the same time, the auxiliary oil pump interlock starts and the circulating booster interlock stops; (7) The bearing temperature of the circulating booster T27~T29 ≥ the preset temperature high 2 value (such as 75℃) triggers an early warning, and at the same time, the auxiliary oil pump interlock starts and the circulating booster interlock stops; (8) The bearing temperature of the circulating booster motor T32, T33 ≥ the preset temperature high 2 value (such as 95℃) triggers an early warning, and at the same time, the auxiliary oil pump interlock starts and the circulating booster interlock stops; (9) The bearing temperature of the circulating booster motor T32, T33 ≥ the preset temperature high 2 value (such as 95℃) ℃) triggers an early warning, and at the same time, the auxiliary oil pump interlock starts and the circulating booster interlock stops; (9) The stator winding temperature of the circulating booster motor T34~T36 ≥ the preset temperature high 2 value (such as 145℃) triggers an early warning, and at the same time, the auxiliary oil pump interlock starts and the circulating booster interlock stops; (10) Y6~Y10 ≥ the preset vibration high 2 value (such as 28mm / s) triggers an early warning, and at the same time, the auxiliary oil pump interlock starts and the circulating booster interlock stops, among which Y6~Y8 are the circulating booster bearing vibration values, and Y9 and Y10 are the circulating booster motor bearing vibration values.

[0125] When the shutdown feedback signal of the circulating booster is triggered and the operation feedback signal is not triggered within the preset time (such as 2s), the interlock opens the circulating booster outlet vent or reflux regulating valve 219, interlocks and closes the circulating booster inlet isolation valve 215 and the circulating booster outlet regulating valve 220, and interlocks and stops the auxiliary oil pump and electric heater after the preset time (such as 5 minutes).

[0126] Fourth, other equipment triggers the interlocking shutdown conditions of the circulating booster as follows: (1) The shutdown feedback signal of the boost expansion refrigeration unit in the air liquefaction system has been triggered and the operation feedback signal has not been triggered, triggering the auxiliary oil pump interlock start and the circulating booster interlock shutdown; (2) The pressure of the main air supply pipe of the instrument / plant compressed air system is ≤ the preset low pressure value (such as 0.4MPa.a), and after a preset time delay (such as 5s), the auxiliary oil pump interlock start and the circulating booster interlock shutdown are triggered; (3) All low-temperature heat storage medium pumps in the heat storage system are stopped (1) If the air compressor shutdown feedback signal has been triggered and the operation feedback signal has not been triggered, the auxiliary oil pump interlock start and the circulating booster interlock shutdown will be triggered after a preset time (such as 5s); (2) If the air compressor shutdown feedback signal has been triggered and the operation feedback signal has not been triggered, the auxiliary oil pump interlock start and the circulating booster interlock shutdown will be triggered; (3) If the air compressor shutdown feedback signal has been triggered and the operation feedback signal has not been triggered, the auxiliary oil pump interlock start and the circulating booster interlock shutdown will be triggered; (4) If the air compressor shutdown feedback signal has been triggered and the operation feedback signal has not been triggered, the auxiliary oil pump interlock start and the circulating booster interlock shutdown will be triggered after a preset time (such as 5s).

[0127] When the shutdown feedback signal of the circulating booster has been triggered and the operation feedback signal has not been triggered within the preset time (such as 2s), the interlock opens the circulating booster outlet vent or reflux regulating valve 219, interlocks and closes the circulating booster inlet isolation valve 215 and the circulating booster outlet regulating valve 220, and interlocks and stops the auxiliary oil pump and electric heater after a preset time (such as 5 minutes).

[0128] Fifth, the shutdown of the circulating booster triggers the interlocking action conditions of other equipment, as follows: (1) Interlock to open the air compressor outlet discharge or return flow regulating valve 16; (2) Interlock to open the circulating booster outlet discharge or return flow regulating valve 219; (3) Interlock to suspend the air purifier switching program, and the status of each valve in the air purifier remains unchanged; (4) Interlock to open the return flow regulating valve of the booster expansion refrigeration unit in the air liquefaction system, interlock to close the inlet emergency isolation valve of the booster expansion refrigeration unit in the air liquefaction system, and interlock to shut down the booster expansion refrigeration unit in the air liquefaction system; (5) Interlock to close the high-pressure liquefied air throttling regulating valve in the air liquefaction system; (6) Interlock to close the liquefied air storage regulating valve in the air liquefaction system.

[0129] Sixth, other triggering warning interlock conditions of the circulating booster are as follows: (1) The auxiliary oil pump needs to be manually started within a preset time (such as 5 minutes) before the circulating booster is started. The circulating booster operation feedback signal has been triggered and the shutdown feedback signal has not been triggered for a preset time (such as 1 minute), and the circulating booster lubricating oil main pipe oil supply pressure P10 ≥ the preset pressure normal value (such as 0.2MPa.g), then the auxiliary oil pump interlock shutdown is triggered; (2) The circulating booster lubricating oil main pipe oil supply pressure P10 ≤ the preset pressure low value 1 (such as 0.18MPa.g), then the auxiliary oil pump interlock start is triggered; (3) The exhaust pressure P9 of the 2nd stage circulating booster ≥ the preset pressure low value If the pressure is higher than 1 value (such as 6MPa), the automatic tracking value of the 2nd stage circulating booster exhaust pressure P9 of the circulating booster outlet discharge or reflux regulating valve 219 drops to the preset normal value (such as 5.95MPa.a); (4) the auxiliary oil pump operation feedback signal has been triggered and the shutdown feedback signal has not been triggered, and the circulating booster lubricating oil tank oil temperature T31 is less than the preset temperature low value (such as 5℃), the constant temperature electric heater interlock starts; (5) the circulating booster lubricating oil tank oil temperature T31 is greater than or equal to the preset temperature normal value (such as 20℃), or the circulating booster operation feedback signal has been triggered and the shutdown feedback signal has not been triggered, the constant temperature electric heater interlock stops. (6) If the liquid level L4 of the 3rd stage water separator of the circulating booster is greater than or equal to the preset liquid level high value (such as 150mm), the warning is triggered and the interlock is opened to open the condensate blow-off isolation valve 216 of the 3rd stage water separator of the circulating booster. If the liquid level L4 of the 3rd stage water separator of the circulating booster is less than the preset liquid level low value (such as 20mm), the interlock is closed to close the condensate blow-off isolation valve 216 of the 3rd stage water separator of the circulating booster. (7) If the liquid level L5 of the 2nd stage air intake buffer of the circulating booster is greater than or equal to the preset liquid level high value (such as 150mm), the warning is triggered and the interlock is opened to open the condensate blow-off isolation valve 216 of the 2nd stage air intake buffer of the circulating booster. Valve 217, if the liquid level L5 of the air inlet buffer of the 2nd stage circulating booster is less than the preset liquid level low value (such as 20mm), the condensate blowing isolation valve 217 of the air inlet buffer of the 2nd stage circulating booster is interlocked and closed; (8) if the liquid level L6 of the 4th stage water separator of the circulating booster is greater than or equal to the preset liquid level high value (such as 200mm), the early warning is triggered and the condensate blowing isolation valve 218 of the 4th stage water separator of the circulating booster is interlocked and opened; if the liquid level L6 of the 4th stage water separator of the circulating booster is less than the preset liquid level low value (such as 30mm), the condensate blowing isolation valve 218 of the 4th stage water separator of the circulating booster is interlocked and closed.

[0130] Seventh, the automatic setting conditions of the circulating booster are as follows: (1) After the circulating booster operation feedback signal has been triggered and the shutdown feedback signal has not been triggered for a preset time (such as 1 minute), the circulating booster outlet regulating valve 220 puts the air liquefaction system inlet pressure into automatic control (the automatic tracking value can refer to 5.9MPa.a), and at the same time, the circulating booster outlet vent or reflux regulating valve 219 puts the 2nd stage circulating booster exhaust pressure P9 into automatic pressure control (the automatic tracking value can refer to 6MPa.a); (2) After the circulating booster operation feedback signal has been triggered and the shutdown feedback signal has not been triggered, the circulating booster inlet isolation valve 215 is interlocked to open, and at the same time, the circulating booster inverter puts the 2nd stage circulating booster outlet flow F4 into automatic flow control (the automatic tracking value refers to the input power curve of the energy storage stage).

[0131] At this point, the preset circulating booster control logic of the present application includes the preset circulating booster start-up sub-logic and the preset circulating booster early warning sub-logic, as well as the circulating booster body parameter exceeding the limit triggering early warning interlocking shutdown conditions, other equipment triggering the circulating booster large interlocking shutdown conditions, circulating booster shutdown triggering other equipment interlocking action conditions, circulating booster other triggering early warning interlocking conditions and circulating booster automatic setting conditions.

[0132] Thus, the embodiments of the present invention provide a protection and control device and method for the air compression system of a compressed air energy storage power station. These devices optimize the control logic for startup permission, protective tripping, and other functions of each main device, specifically design the control logic for the associated lubricating oil auxiliary pump and related control valve interlock start / stop (switching), and scientifically and rationally expand the protection and control logic between devices. This device effectively ensures the safe and efficient operation of the compressed air energy storage power station's air compression system from startup to full load, ensuring that the operating parameters of the main and auxiliary machine lubrication and cooling systems are within a safe operating range. This enhances the safety and reliability of the compressed air energy storage power station, its continuous response speed to changes in electrical load, and its ability to support the power grid.

[0133] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A protection control device for an air compression system, wherein: The air compression system includes an air filter, an air compressor unit, an air purifier, and a circulating booster unit, and is characterized by comprising: a control module, an air purifier protection module, and an air compressor protection module and a circulating booster protection module connected to the air purifier protection module, wherein: The air compressor protection module includes a first differential pressure measuring point arranged at both ends of the air filter and a first pressure measuring point set, a first temperature measuring point set, a first vibration measuring point set, a first liquid level measuring point set and a first flow measuring point set arranged on the air compressor group; The air purifier protection module includes a first differential pressure measurement point set, a second pressure measurement point set, a second temperature measurement point set, an air inlet constant temperature electric heater flow measurement point and an air purifier outlet air content measurement point arranged on the air purifier; The circulating booster protection module includes a third pressure measurement point set, a third temperature measurement point set, a second liquid level measurement point set, a second flow measurement point set, and a second vibration measurement point set provided on the circulating booster unit; The control module is used to receive the air compressor status data transmitted by the first differential pressure measuring point, the first pressure measuring point set, the first temperature measuring point set, the first vibration measuring point set, the first liquid level measuring point set and the first flow measuring point set, the air purifier status data transmitted by the first differential pressure measuring point set, the second pressure measuring point set, the second temperature measuring point set, the air inlet constant temperature electric heater flow measuring point and the air purifier outlet air content measuring point, and the circulating booster status data transmitted by the third pressure measuring point set, the third temperature measuring point set, the second liquid level measuring point set, the second flow measuring point set and the second vibration measuring point set, and perform protection control on the air compressor unit according to the air compressor status data and the preset air compressor control logic, perform protection control on the air purifier according to the air purifier status data and the preset air purifier control logic, and perform protection control on the circulating booster unit according to the circulating booster status data and the preset circulating booster control logic.

2. The protection and control device according to claim 1, characterized in that: The air compressor unit includes a first-stage air compressor and a second-stage air compressor, wherein a first-stage air intake buffer and a first-stage exhaust buffer are respectively provided at both ends of the first-stage air compressor, and a second-stage air intake buffer and a second-stage exhaust buffer are respectively provided at both ends of the second-stage air compressor, a first-stage cooler and a first-stage moisture separator are sequentially provided between the first-stage exhaust buffer and the second-stage air intake buffer, and a second-stage cooler and a second-stage moisture separator are sequentially provided between the second-stage exhaust buffer and the air purifier, wherein: The first pressure measurement point set includes: a first-stage air compressor intake pressure measurement point disposed between the first-stage air intake buffer and the first-stage air compressor, a first-stage air compressor exhaust pressure measurement point disposed between the first-stage air compressor and the first-stage exhaust buffer, and a second-stage air compressor exhaust pressure measurement point disposed downstream of the second-stage air separator; The first temperature measurement point set includes: a first-stage air compressor intake temperature measurement point set between the first-stage air intake buffer and the first-stage air compressor, a first-stage air compressor exhaust temperature measurement point set between the first-stage air compressor and the first-stage exhaust buffer, a second-stage air compressor intake temperature measurement point set between the second-stage air intake buffer and the second-stage air compressor, a second-stage air compressor exhaust temperature measurement point set between the second-stage air compressor and the second-stage exhaust buffer, and a second-stage cooler exhaust temperature measurement point set downstream of the second-stage moisture separator; The first liquid level measurement point set includes: a first-level water separator liquid level measurement point of the air compressor set on the first-level water separator, a second-level air compressor air intake buffer liquid level measurement point set on the second-level air intake buffer, and a second-level water separator liquid level measurement point of the air compressor set on the second-level water separator; The first flow measurement point set includes: a secondary air compressor outlet flow measurement point arranged downstream of the secondary moisture divider.

3. The protection and control device according to claim 2, characterized in that: The first-stage air compressor and the second-stage air compressor are coaxially arranged, and the air compressor unit further includes an auxiliary oil pump, a coaxial oil pump, an oil cooler, an oil filter, a constant temperature electric heater and a lubricating oil tank, wherein: The air compressor protection module further includes air compressor oil filter differential pressure measuring points arranged at both ends of the oil filter; The first pressure measurement point set also includes an air compressor lubricating oil main pipe oil supply pressure measurement point; The first temperature measurement point set also includes: an air compressor bearing temperature measurement point, an air compressor lubricating oil main pipe oil supply temperature measurement point, an air compressor lubricating oil tank oil temperature measurement point, an air compressor motor bearing temperature measurement point, and an air compressor motor stator winding temperature measurement point; The first vibration measurement point set includes: air compressor bearing vibration measurement points and air compressor motor bearing vibration measurement points; The first flow measurement point set also includes: an air compressor oil cooler cooling water return total flow measurement point set on the oil cooler.

4. The protection and control device according to claim 1, characterized in that: The air purifier includes an electric heater, a first molecular sieve air purifier and a second molecular sieve air purifier, wherein: The first differential pressure measurement point set includes: air purifier inlet and outlet differential pressure measurement points set at both ends of the second molecular sieve air purifier and an air outlet differential pressure measurement point set between the first molecular sieve air purifier and the second molecular sieve air purifier when the two sieves are pressurized; The second pressure measurement point set includes: a sieve 1 air outlet pressure measurement point arranged downstream of the first molecular sieve air purifier and a sieve 2 air outlet pressure measurement point arranged downstream of the second molecular sieve air purifier; The second temperature measurement point set includes: a sieve 1 air inlet temperature measurement point set upstream of the first molecular sieve air purifier, a sieve 2 air inlet temperature measurement point set upstream of the second molecular sieve air purifier, a sieve 1 air outlet temperature measurement point set downstream of the first molecular sieve air purifier, a sieve 2 air outlet temperature measurement point set upstream of the second molecular sieve air purifier, an air purifier outlet temperature measurement point set downstream of the first molecular sieve air purifier, and an electric heater internal temperature measurement point set on the electric heater.

5. The protection and control device according to claim 1, characterized in that: The circulating supercharger unit includes a primary circulating supercharger and a secondary circulating supercharger, wherein a primary air intake buffer and a primary exhaust buffer are respectively provided at both ends of the primary circulating supercharger, and a secondary air intake buffer and a secondary exhaust buffer are respectively provided at both ends of the secondary circulating supercharger, a third-stage cooler and a third-stage water separator are sequentially provided between the first-stage exhaust buffer and the second-stage air intake buffer, and a fourth-stage cooler and a fourth-stage water separator are sequentially provided between the second-stage exhaust buffer and the air liquefaction system, wherein: The third pressure measurement point set includes: a primary circulation supercharger intake pressure measurement point set between the primary circulation supercharger and the primary circulation supercharger, a primary circulation supercharger exhaust pressure measurement point set between the primary circulation supercharger and the primary exhaust buffer, and a secondary circulation supercharger exhaust pressure measurement point set downstream of the fourth-stage water separator; The third temperature measurement point set includes: a primary circulation supercharger intake temperature measurement point set between the primary air intake buffer and the primary circulation supercharger, a primary circulation supercharger exhaust temperature measurement point set between the primary circulation supercharger and the primary exhaust buffer, a secondary circulation supercharger intake temperature measurement point set between the secondary air intake buffer and the secondary circulation supercharger, a secondary circulation supercharger exhaust temperature measurement point set between the secondary circulation supercharger and the secondary exhaust buffer, and a fourth-stage cooler exhaust temperature measurement point set downstream of the fourth-stage moisture divider; The second liquid level measurement point set includes: a circulating booster third-stage water divider liquid level measurement point set on the third-stage water divider, a secondary circulating booster air intake buffer liquid level measurement point set on the secondary air intake buffer, and a circulating booster fourth-stage water divider liquid level measurement point set on the fourth-stage water divider; The second flow measurement point set includes: a secondary circulation booster outlet flow measurement point arranged downstream of the fourth-stage water distributor.

6. The protection and control device according to claim 5, characterized in that: The primary circulation booster and the secondary circulation booster are coaxially arranged, and the circulation booster unit further includes an auxiliary oil pump, a coaxial oil pump, an oil cooler, an oil filter, a constant temperature electric heater, and a lubricating oil tank, wherein: The circulating supercharger protection module further includes circulating supercharger oil filter differential pressure measuring points arranged at both ends of the oil filter; The third pressure measurement point set also includes a circulating booster lubricating oil main pipe oil supply pressure measurement point; The third temperature measurement point set also includes: a circulating supercharger bearing temperature measurement point, a circulating supercharger lubricating oil main pipe oil supply temperature measurement point, a circulating supercharger lubricating oil tank oil temperature measurement point, a circulating supercharger motor bearing temperature measurement point, and a circulating supercharger motor stator winding temperature measurement point; The second flow measurement point set also includes: a circulating supercharger oil cooler cooling water return water total flow measurement point arranged on the oil cooler; The second vibration measurement point set includes: a circulating supercharger bearing vibration measurement point and a circulating supercharger motor bearing vibration measurement point.

7. The protection and control device according to claim 3, characterized in that: The preset air compressor control logic includes a preset air compressor start sub-logic and a preset air compressor early warning sub-logic, wherein: The control module is configured to determine whether the air compressor unit can be started based on the first air compressor status sub-data transmitted by the first differential pressure measuring point, the air compressor oil filter differential pressure measuring point, the air compressor lubricating oil main pipe oil supply pressure measuring point, the air compressor lubricating oil tank oil temperature measuring point, the air compressor oil cooler cooling water return total flow measuring point, the air compressor first-level water separator liquid level measuring point, the second-level air compressor intake buffer liquid level measuring point, the air compressor second-level water separator liquid level measuring point, the air compressor bearing vibration measuring point, and the air compressor motor bearing vibration measuring point, and the preset air compressor start sub-logic; The control module is used to determine whether the air compressor group has an abnormality based on the second air compressor status sub-data transmitted by the first-stage air compressor intake pressure measuring point, the second-stage air compressor exhaust pressure measuring point, the air compressor lubricating oil main pipe oil supply pressure measuring point, the first-stage air compressor exhaust temperature measuring point, the second-stage air compressor exhaust temperature measuring point, the air compressor bearing temperature measuring point, the air compressor lubricating oil main pipe oil supply temperature measuring point, the air compressor lubricating oil tank oil temperature measuring point, the air compressor motor bearing temperature measuring point, the air compressor motor stator winding temperature measuring point, the air compressor oil filter differential pressure measuring point, the air compressor oil cooler cooling water return total flow measuring point, the air compressor bearing vibration measuring point and the air compressor motor bearing vibration measuring point, and the preset air compressor early warning sub-logic.

8. The protection and control device according to claim 4, characterized in that: The control module is used to determine whether there is an abnormality in the air purifier based on the air purifier outlet air CO2 content measurement point, the air inlet constant temperature electric heater flow measurement point, the air purifier inlet and outlet differential pressure measurement point, the air outlet differential pressure measurement point when the two screens are pressurized, the screen 1 air outlet pressure measurement point, the screen 2 air outlet pressure measurement point, the screen 1 air inlet temperature measurement point, the screen 2 air inlet temperature measurement point and the electric heater internal temperature measurement point, as well as the preset air purifier control logic.

9. The protection and control device according to claim 6, characterized in that: The preset circulation booster control logic includes a preset circulation booster start sub-logic and a preset circulation booster early warning sub-logic, wherein: The control module is used to determine whether the circulating supercharger unit can be started according to the first circulating supercharger status sub-data transmitted by the circulating supercharger bearing vibration measurement point and the circulating supercharger motor bearing vibration measurement point and the preset circulating supercharger start sub-logic; The control module is used to determine whether the circulating booster unit has an abnormality based on the circulating booster lubricating oil main pipe oil supply pressure measuring point, the circulating booster lubricating oil main pipe oil supply temperature measuring point, the circulating booster oil filter differential pressure measuring point, the circulating booster oil cooler cooling water return total flow measuring point, the secondary circulating booster exhaust pressure measuring point, the primary circulating booster exhaust temperature measuring point, the secondary circulating booster exhaust temperature measuring point, the circulating booster bearing temperature measuring point, the circulating booster motor bearing temperature measuring point, the circulating booster motor stator winding temperature measuring point, the circulating booster lubricating oil tank oil temperature measuring point, the circulating booster bearing vibration measuring point, and the second circulating booster status sub-data transmitted by the circulating booster motor bearing vibration measuring point and the preset circulating booster early warning sub-logic.

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