Steam-gas mixed medium high-vacuum low-energy-consumption intelligent control system and control method

Abstract

The invention provides a steam-gas mixed medium high-vacuum low-energy-consumption intelligent control system and a control method. Comprising a vapor phase precondenser, a vapor phase precondenser steam extraction opening pressure sensor, a vapor phase precondenser cooling water inlet control valve, a vapor phase precondenser cooling water inlet pressure sensor, a multi-channel efficient steam jet vacuum pump, a multi-channel efficient steam jet vacuum pump steam extraction opening pressure sensor and a multi-channel efficient steam jet vacuum pump injection steam inlet control valve. The system comprises a multi-channel efficient steam jet vacuum pump, a steam jet pressure sensor, a steam phase final cooler, a steam phase final cooler pressure sensor, a steam phase final cooler cooling water inlet control valve, a steam phase final cooler water inlet pressure sensor, a low-power-consumption auxiliary pump, a low-power-consumption auxiliary pump extraction opening control valve and a system controller. The system is designed according to the vacuum suction characteristic of a steam-gas mixed medium, the vacuum degree of the system can be remarkably improved, the energy consumption can be remarkably reduced, and therefore the heat energy utilization efficiency and the self-control capacity of a front-end system can be remarkably improved, the production efficiency is improved, the yield is increased, the efficiency is improved, and remarkable economic benefits are created.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum energy-saving control of steam-gas mixed medium, and in particular to a high-vacuum and low-energy consumption intelligent control system and a control method for a steam-gas mixed medium. Background Art

[0002] Steam-gas mixed medium is mostly a mixture of condensable gases such as water vapor and non-condensable gases such as air. It is the main vacuum suction medium in the rough vacuum production system in industrial production.

[0003] At present, in major application scenarios such as chemical evaporation and condensation systems and energy power generation steam turbine cold end systems, the main vacuum equipment used for pumping steam-gas mixed media is still traditional mechanical vacuum pump equipment such as liquid ring vacuum pumps and Roots vacuum pumps. However, due to the limitations of their own principles and mechanical structure characteristics, traditional mechanical pumps are sensitive to condensable media such as water vapor and are easily affected by cavitation caused by water vapor temperature rise. Water vapor in the medium can easily corrode the rotating parts of the mechanical flow channel, resulting in generally low operating vacuum and high operating power consumption of traditional mechanical vacuum pumps. More importantly, traditional mechanical vacuum equipment cannot provide higher vacuum performance when pumping steam-gas mixed media, which indirectly reduces the thermal energy utilization efficiency and production efficiency of the front-end system, causing considerable economic losses to industrial production.

[0004] At the same time, the traditional vacuum equipment for sucking steam and gas mixed media has a single control system, and most of them only have remote start and stop and frequency conversion control modes. They do not have the ability to improve the self-control adjustment of the vacuum and the fine automatic control ability for low-consumption and energy-saving operation. It is difficult to meet the ever-changing intelligent and refined operation and management needs of industrial production.

[0005] Therefore, in view of the problems existing in the existing steam-gas mixed medium vacuum suction equipment technology, such as medium unsuitability, low vacuum, high energy consumption, weak adjustability, and single control, a steam-gas mixed medium high vacuum and low energy consumption intelligent control system and control method are urgently needed to adapt to the characteristics of steam-gas mixed media, improve the system vacuum performance, reduce the system operation energy consumption, and realize a wider range of vacuum energy consumption intelligent control regulation, so as to bring greater energy-saving and efficiency-enhancing benefits, higher intelligent operation efficiency, and more refined operation management to industrial production enterprises in various industries, and create greater social and economic benefits. Summary of the invention

[0006] In view of the problems existing in the existing steam-gas mixed medium vacuum suction equipment technology, such as medium incompatibility, low vacuum, high energy consumption, weak adjustability, and single control, the present invention provides a steam-gas mixed medium high-vacuum and low-energy consumption intelligent control system and control method to adapt to the characteristics of the steam-gas mixed medium, improve the system vacuum performance, reduce the system operation energy consumption, and realize a wider range of vacuum energy consumption intelligent control regulation.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A high-vacuum, low-energy intelligent control system for a steam-gas mixed medium, comprising a vapor phase precondenser, a vapor phase precondenser steam extraction port pressure sensor, a vapor phase precondenser cooling water inlet control valve, a vapor phase precondenser cooling water inlet pressure sensor, a multi-channel high-efficiency steam jet vacuum pump, a multi-channel high-efficiency steam jet vacuum pump steam extraction port pressure sensor, a multi-channel high-efficiency steam jet vacuum pump induced steam inlet control valve, a multi-channel high-efficiency steam jet vacuum pump induced steam pressure sensor, a vapor phase final cooler, a vapor phase final cooler pressure sensor, a vapor phase final cooler cooling water inlet control valve, a vapor phase final cooler water inlet pressure sensor, a low-power auxiliary pump, a low-power auxiliary pump air extraction port control valve, and a system controller. The vapor phase precondenser is a vapor phase condensable medium pre-condensation device, and the multi-channel high-efficiency steam jet vacuum pump and the low-power auxiliary pump are used for extraction at the rear end. Under suction, the steam-gas mixture medium is drawn into the vapor phase precondenser through the vapor phase precondenser extraction pipe, and then condenses and exchanges heat with the cooling water transported by the vapor phase precondenser cooling water inlet pipe, so as to realize the pre-condensation, removal and separation of the vapor phase condensable components in the extracted steam-gas mixture medium, greatly reduce the volume of the steam-gas mixture medium, and reduce the suction load of the rear-end vacuum equipment. The remaining vapor-phase non-condensable gas is discharged into the multi-channel high-efficiency steam jet vacuum pump through the vapor phase precondenser exhaust pipe. The suction vacuum pressure of the vapor phase precondenser is monitored by the vapor phase precondenser extraction port pressure sensor, and is interlocked with the vapor phase precondenser cooling water inlet control valve and the vapor phase precondenser cooling water inlet pressure sensor, and is connected with the system controller through a control cable to realize the remote monitoring, setting and adjustment of the suction vacuum pressure of the vapor phase precondenser. The high-efficiency steam jet vacuum pump is the core equipment providing high vacuum performance for this device. It adopts the inventor's original multi-channel multi-nozzle steam jet vacuum equipment, and generates multiple supersonic airflows through the medium and low pressure working steam transported by the steam inlet pipe of the multi-channel high-efficiency steam jet vacuum pump, and ejects the gas phase non-condensable gas discharged from the exhaust pipe of the vapor phase pre-condenser. The steam-gas mixed medium is discharged into the vapor phase final cooler through the mixed steam exhaust pipe of the multi-channel high-efficiency steam jet vacuum pump. The vacuum pressure of the multi-channel high-efficiency steam jet vacuum pump suction is monitored by the multi-channel high-efficiency steam jet vacuum pump exhaust port pressure sensor, and is interlocked with the multi-channel high-efficiency steam jet vacuum pump suction steam control valve and the multi-channel high-efficiency steam jet vacuum pump suction steam pressure sensor, and is connected to the system controller through a control cable to realize the multi-channel high-efficiency steam jet vacuum pump suction vacuum pressure. Remote monitoring, setting and adjustment of air pressure. The vapor phase final cooler is the core equipment for re-condensing the intermediate vapor-gas mixed medium. Under the suction of the rear low-power auxiliary pump, the vapor-gas mixed medium discharged by the multi-channel high-efficiency steam jet vacuum pump is pumped into the vapor phase final cooler, and then condensed and heat-exchanged with the cooling water transported by the cooling water inlet pipe of the vapor phase final cooler, so as to realize the re-condensation, removal and separation of the vapor phase condensable components in the extracted vapor-gas mixed medium. The remaining small amount of vapor-phase non-condensable gas is discharged into the rear low-power auxiliary pump through the vapor phase final cooler exhaust pipe, and then discharged into the atmosphere or the tail gas recovery system. The vacuum pressure in the vapor phase final cooler is monitored by the vapor phase final cooler pressure sensor, and is interlocked with the vapor phase final cooler cooling water inlet control valve and the vapor phase final cooler water inlet pressure sensor, and connected to the system controller through the control cable.The system controller is the core control component of the system of the present invention, which usually uses a programmable controller to connect to the industrial production central control system for data transmission, and realizes the remote monitoring, interlocking control, setting, and adjustment of the pressure at each monitoring point and the control valve of the system of the present invention.

[0009] Furthermore, the control method of the steam-gas mixed medium high vacuum low energy consumption intelligent control system is as follows:

[0010] Step 1: Set the system to automatic operation mode;

[0011] According to the mainstream operation requirements of the industrial production steam-gas mixed medium vacuum suction equipment system, four system automatic operation modes are set in the system controller, including performance mode, energy-saving mode, and balanced mode, and each operation mode is designed with its own operating parameter limit range. The automatic operation mode is used for daily normal operation settings, and the system start and stop are manually set;

[0012] Performance mode: the highest suction vacuum mode, which is usually used in high-load conditions or in summer when the ambient temperature is high. It is achieved through the automatic control of two-stage condensation and two-stage high and low vacuum suction combination of vapor phase precondenser, multi-channel high-efficiency steam jet vacuum pump, vapor phase final cooler, and low-power auxiliary pump;

[0013] Energy-saving mode: the lowest energy consumption mode. This mode is usually used in low-load conditions or in winter when the ambient temperature is low. Based on the vacuum pressure set at the system suction port, the system automatically adjusts the condensing cooling water volume of the vapor phase precondenser, the steam pressure of the multi-channel high-efficiency steam jet vacuum pump, the cooling water volume of the vapor phase final cooler, and the operating frequency and current of the low-power auxiliary pump to achieve the best comprehensive water-saving, steam-saving, and electricity-saving performance;

[0014] Balanced mode: a mode that is a balanced match between the optimal suction vacuum performance and the optimal energy consumption performance. This mode is usually used in medium load conditions or in spring and autumn when the ambient temperature is neither high nor low. Based on the set vacuum pressure at the system suction port, the system automatically adjusts the condensing cooling water volume of the vapor phase precondenser, the steam pressure of the multi-channel high-efficiency steam jet vacuum pump, the cooling water volume of the vapor phase final cooler, and the operating frequency and current of the low-power auxiliary pump to achieve energy consumption balance under the set suction vacuum performance;

[0015] Step 2: Monitor the system's automatic operation mode;

[0016] According to the performance parameters of each mode of the system of the present invention, the pressure, temperature and current parameters of each monitoring point under the current operation mode are monitored by the system controller; P0 is the vacuum pressure of the steam extraction port of the vapor phase precondenser, P1 is the cooling water inlet pressure of the vapor phase precondenser, P3 is the steam pressure of the multi-channel high-efficiency steam ejector vacuum pump, P4 is the vacuum pressure in the vapor phase final cooler, P5 is the cooling water inlet pressure of the vapor phase final cooler, T1 is the cooling water inlet temperature of the vapor phase precondenser, T2 is the cooling water outlet temperature of the vapor phase precondenser, T3 is the cooling water inlet temperature of the vapor phase final cooler, and T4 is the cooling water outlet temperature of the vapor phase final cooler;

[0017] Step 3: Determine whether the vacuum and energy consumption parameters of each monitoring point under the set automatic operation mode are reasonable;

[0018] According to the monitoring data of step 2 and the design performance parameters of each mode of the system of the present invention, the system status is judged by comparing the real-time data of the pressure, temperature and other parameters at each point of the system controller; pressure judgment, judge in turn whether P0 can reach the set value, the pressure range and adjustment margin of P1, whether P2 reaches the designed vacuum pressure, the pressure range and adjustment margin of P3; P4 vacuum pressure state, P5 pressure range and adjustment margin; temperature judgment: judge in turn whether the temperature difference between T1 and T2 and the range are reasonable, and judge whether the temperature difference range between T3 and T4 is reasonable; current judgment: monitor the operating current size and adjustment margin of the low-power auxiliary pump through the system controller;

[0019] Step 4: Adjust and set the operating parameters of each point in the operating mode;

[0020] According to step 1 setting, step 2 monitoring, step 3 judgment, step 4 starts automatic adjustment, realizes the automatic control adjustment in the designed and selected automatic operation mode, and obtains the operation effect of the set automatic operation mode;

[0021] Performance mode adjustment: according to the system operation requirements, within the set parameter range, set the system steam extraction port vacuum P0 size under the performance mode; the system controller adjusts the vapor precondenser cooling water inlet control valve in turn to increase the vapor precondenser cooling water inlet pressure P1, so that the vapor precondenser is fully condensed; adjust the multi-channel high-efficiency steam jet vacuum pump induced steam inlet control valve to increase the multi-channel high-efficiency steam jet vacuum pump induced steam pressure P3 to increase the multi-channel high-efficiency steam jet vacuum pump suction port vacuum pressure P2; adjust the vapor phase final cooler cooling water inlet control valve to increase the vapor phase final cooler cooling water inlet pressure P5 to fully condense the condensable steam in the vapor phase final cooler; adjust the low-power auxiliary pump suction port control valve and the low-power auxiliary pump motor frequency to increase the low-power auxiliary pump extraction volume and suction port limit vacuum pressure; when the system steam extraction port vacuum P0 is set under the set performance mode, the system automatically keeps the positions of each control valve stable. If the upper and lower deviations of P0 exceed the design range, it will automatically adjust to stability according to the above control logic;

[0022] Energy-saving mode adjustment: according to the system operation requirements, within the set parameter range, set the system extraction port vacuum P0 size in the performance mode; the system controller sequentially adjusts the vapor precondenser cooling water inlet control valve, and adjusts the vapor precondenser cooling water inlet pressure P1 without affecting P0, thereby reducing the amount of cooling water for the vapor precondenser to save water; adjusts the multi-channel high-efficiency steam jet vacuum pump induced steam inlet control valve, and adjusts the multi-channel high-efficiency steam jet vacuum pump induced steam pressure P3 without affecting P0, thereby reducing the induced steam consumption of the multi-channel high-efficiency steam jet vacuum pump; adjusts the vapor phase final cooling The cooling water inlet control valve of the vapor phase final cooler can be adjusted down to P5 without affecting P0, so as to reduce the cooling water volume of the vapor phase final cooler and save water; the low-power auxiliary pump air extraction port control valve and the motor frequency of the low-power auxiliary pump can be adjusted down to reduce the power consumption of the low-power auxiliary pump without affecting P0; the above adjustments are carried out in sequence, and when the system air extraction port vacuum P0 is set under the set performance mode, the system automatically keeps the positions of various control valves stable. If the upper and lower deviations of P0 exceed the design range, the control valves are automatically adjusted up or down according to the above control logic to be stable;

[0023] Balance mode adjustment: according to the system operation requirements, within the set parameter range, set the system steam extraction port vacuum P0 size in the performance mode; the system controller selectively adjusts it, firstly adjusts the low-power auxiliary pump air extraction port control valve and the low-power auxiliary pump motor frequency, without affecting P0, to reduce the low-power auxiliary pump power consumption; secondly, adjusts the multi-channel high-efficiency steam injection vacuum pump induced steam inlet control valve, without affecting P0, reduces the multi-channel high-efficiency steam injection vacuum pump induced steam pressure P3, reduces the multi-channel high-efficiency steam injection vacuum pump induced steam pressure P4. Steam consumption; if there is still room for adjustment, adjust the vapor phase final cooler cooling water inlet control valve again. Without affecting P0, reduce the vapor phase final cooler cooling water inlet pressure P5, reduce the vapor phase final cooler cooling water volume to save water; finally, if there is still room for adjustment, adjust the vapor phase precondenser cooling water inlet control valve again. Without affecting P0, reduce the vapor phase precondenser cooling water inlet pressure P1, reduce the vapor phase precondenser cooling water volume to save water; Finally, without affecting P0, the system automatically adjusts to the best balance between performance and energy consumption.

[0024] Furthermore, the described high-vacuum, low-energy intelligent control system and control method for a steam-gas mixed medium can remotely adjust the vacuum at the steam extraction port of the vapor phase pre-condenser, the vacuum at the steam extraction port of the multi-channel high-efficiency steam jet vacuum pump, and the vacuum performance in the vapor phase final cooler through the system controller and the production central control system according to the ambient temperature in different seasons and different production load and condensation load conditions. At the same time, it can also automatically regulate the water consumption, steam consumption, and power consumption of the system to achieve the most efficient or most economical operation of the system of the present invention and achieve the optimal balance between comprehensive performance and energy consumption. The vapor phase precondenser and vapor phase final cooler usually adopt a partition-type or direct-cooling vapor phase capture and condensation structure according to the production operation or transformation conditions. When low-level installation (installation height ≤ 6m) is required or the vapor phase condensable medium needs to be separated separately, a partition-type vapor phase capture condenser is adopted, and a condensate drainage pump is required to overcome the vacuum pressure in the vapor phase precondenser and the vapor phase final cooler to achieve the separation of cold and hot media and the separate separation and recovery of the vapor phase condensable medium. When high-level installation (installation height ≥ 10m) is adopted or the vapor phase condensable medium does not need to be separated and recovered separately, a direct mixed condensation vapor phase capture and condensation structure is adopted to obtain better heat exchange condensation efficiency and consume less coolant medium.

[0025] Furthermore, the vapor phase pre-condenser and vapor phase final cooler usually adopt a partition-type or direct-cooling vapor phase capture and condensation structure according to the production operation or transformation conditions. When low-level installation (installation height ≤ 6m) is required or the vapor-phase condensable medium needs to be separated separately, a partition-type vapor phase capture condenser is adopted, and a condensate drainage pump is required to overcome the vacuum pressure in the vapor phase pre-condenser and the vapor phase final cooler to achieve the separation of cold and hot media and the separate separation and recovery of the vapor-phase condensable medium. When high-level installation (installation height ≥ 10m) is adopted or the vapor-phase condensable medium does not need to be separated and recovered separately, a direct mixed condensation vapor phase capture and condensation structure is adopted to obtain better heat exchange condensation efficiency while consuming less coolant medium.

[0026] Furthermore, according to the production operation or transformation conditions, the multi-channel high-efficiency steam jet vacuum pump has 2-5 channels and 2-5 nozzles, the working steam pressure adjustment range for injection is 0-0.5MPa, the adjustment method is manual or automatic system adjustment, and the maximum vacuum range of the multi-channel high-efficiency steam jet vacuum pump is 0.5-3KPa.

[0027] Compared with the prior art, the steam-gas mixed medium high vacuum low energy consumption intelligent control system and control method provided by the present invention have the following advantages:

[0028] 1. The present invention solves the technical problems in the industry, that is, it innovatively adopts the system technology of pre-condensation + high-vacuum steam injection extraction + recondensation + low-consumption auxiliary extraction, and realizes the effective separation of the system of condensation of condensable steam and extraction of non-condensable steam in the steam-gas mixed medium. It solves the industry problems of mechanical vacuum pumps and other products in the prior art when extracting high condensable steam ratio conditions in the steam-gas mixed medium, such as medium unsuitability, low vacuum and high energy consumption. It can significantly improve the system vacuum and reduce the system energy consumption.

[0029] 2. The present invention solves the pain points of industry users. The present invention adopts a "one-button automatic control" operation mode and innovatively designs three automatic control operation modes: performance mode, energy-saving mode, and balanced mode. It solves the problems of steam-gas mixed medium vacuum suction system, traditional vacuum equipment has poor adjustability and single control, and solves the pain points of industry users for more intelligent operation and more refined operation management.

[0030] 3. The vacuum performance, energy-saving performance and reliability of the system of the present invention are greatly improved. The present invention adopts a supersonic multi-channel high-efficiency steam jet vacuum pump to obtain high vacuum performance, adopts a low-consumption auxiliary mechanical pump to assist in pumping non-condensable steam, and adopts a multi-stage high-efficiency condenser to condense condensable steam. The actual operating limit vacuum reaches 0.65-3KPa, which is better than the vacuum performance of more than 5KPa of traditional mechanical pumps. At the same time, the power consumption of the system is reduced by 50-70% compared with the traditional mechanical vacuum pump. The main condensation high vacuum equipment of the system is static equipment, and the system reliability is better than the traditional single mechanical vacuum product.

[0031] 4. The present invention is designed for the vacuum suction characteristics of steam-gas mixed media, and can be widely used in multiple-effect evaporation systems, steam turbine condensation systems, chemical distillation systems, etc., and can obtain higher vacuum performance than traditional mechanical pumps, thereby reducing the cold-end back pressure of the user's evaporation system, condensation system, distillation system, etc., thereby significantly improving the thermal energy utilization efficiency of the front-end system, improving production intensity or production efficiency, and increasing production and efficiency. Therefore, the present invention can create significant economic benefits, social benefits, energy-saving and environmental protection benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a flow chart of a steam-gas mixed medium high vacuum low energy consumption intelligent control system and control method provided by the present invention.

[0033] In the figure, 100, vapor phase precondenser; 101, vapor phase precondenser steam extraction pipe; 102, vapor phase precondenser steam extraction port pressure sensor; 103, vapor phase precondenser cooling water inlet pipe; 104, vapor phase precondenser cooling water inlet control valve; 105, vapor phase precondenser cooling water inlet pressure sensor; 106, vapor phase precondenser steam exhaust pipe; 107, vapor phase precondenser condensate drain pipe; 108, vapor phase precondenser cooling water outlet pipe; 200, multi-channel high-efficiency steam jet vacuum pump; 201, multi-channel high-efficiency steam jet vacuum pump steam extraction port pressure sensor; 202, multi-channel high-efficiency steam jet vacuum pump induced steam steam inlet pipe; 203, multi-channel high-efficiency steam jet vacuum pump induced steam inlet control valve; 204, multi Channel high-efficiency steam jet vacuum pump induced steam pressure sensor; 205, multi-channel high-efficiency steam jet vacuum pump mixed steam exhaust pipe; 300, vapor phase end cooler; 301, vapor phase end cooler pressure sensor; 302, vapor phase end cooler cooling water inlet pipe; 303, vapor phase end cooler cooling water inlet control valve; 304, vapor phase end cooler water inlet pressure sensor; 305, vapor phase end cooler non-condensable gas exhaust pipe; 306, vapor phase end cooler condensate drain pipe; 307, vapor phase end cooler cooling water outlet pipe; 400, low-power auxiliary pump; 401, low-power auxiliary pump exhaust port control valve; 402, low-power auxiliary pump exhaust pipe; 403, low-power auxiliary pump exhaust pipe; 500, system controller. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Please refer to Figure 1As shown, the present invention provides a high-vacuum and low-energy intelligent control system for a steam-gas mixed medium, including a vapor phase precondenser 100, a vapor phase precondenser extraction port pressure sensor 102, a vapor phase precondenser cooling water inlet control valve 104, a vapor phase precondenser cooling water inlet pressure sensor 105, a multi-channel high-efficiency steam jet vacuum pump 200, a multi-channel high-efficiency steam jet vacuum pump extraction port pressure sensor 201, a multi-channel high-efficiency steam jet vacuum pump induced steam inlet control valve 203, a multi-channel high-efficiency steam jet vacuum pump induced steam pressure sensor 204, a vapor phase final cooler 300, a vapor phase final cooler pressure sensor 301, a vapor phase final cooler cooling water inlet control valve 303, a vapor phase final cooler water inlet pressure sensor 304, a low-power auxiliary pump 400, and a low-power auxiliary pump extraction port control valve 404. 01. System controller 500. The vapor phase precondenser 100 is a pre-condensation device for vapor phase condensable medium. Under the suction of the rear multi-channel high-efficiency steam jet vacuum pump 200 and the low-power auxiliary pump 400, the vapor-gas mixture medium is sucked into the vapor phase precondenser 100 through the vapor phase precondenser extraction pipe 101, and then condensed and heat-exchanged with the cooling water transported by the vapor phase precondenser cooling water inlet pipe 103, so as to realize the pre-condensation, removal and separation of the vapor phase condensable components in the extracted vapor-gas mixture medium, greatly reduce the volume of the vapor-gas mixture medium, and reduce the suction load of the rear-end vacuum equipment. The remaining gas phase non-condensable gas is discharged into the multi-channel high-efficiency steam jet vacuum pump 200 through the vapor phase precondenser exhaust pipe 106. The vapor phase precondenser 100 inhales the vacuum pressure, and the pressure sensor of the vapor phase precondenser extraction port is used. The device 102 is monitored and interlocked with the vapor phase precondenser cooling water inlet control valve 104 and the vapor phase precondenser cooling water inlet pressure sensor 105, and is connected to the system controller through a control cable to realize remote monitoring, setting and adjustment of the suction vacuum pressure of the vapor phase precondenser 100. The multi-channel high-efficiency steam jet vacuum pump 200 provides a core device with high vacuum performance for this device. The inventor's original multi-channel multi-nozzle steam jet vacuum equipment is adopted. The medium and low pressure working steam transported by the steam inlet pipe 202 of the multi-channel high-efficiency steam jet vacuum pump is used to generate multiple supersonic airflows, and the gas phase non-condensable gas discharged from the vapor phase precondenser exhaust pipe 106 is ejected. The steam-gas mixed medium is discharged into the vapor phase final cooler 300 through the multi-channel high-efficiency steam jet vacuum pump mixed steam exhaust pipe 205. The suction vacuum pressure of the multi-channel high-efficiency steam jet vacuum pump 200 is monitored by the multi-channel high-efficiency steam jet vacuum pump extraction port pressure sensor 204, and is interlocked with the multi-channel high-efficiency steam jet vacuum pump induced steam inlet control valve 203 and the multi-channel high-efficiency steam jet vacuum pump induced steam pressure sensor 204, and is connected to the system controller through a control cable to realize remote monitoring, setting and adjustment of the suction vacuum pressure of the multi-channel high-efficiency steam jet vacuum pump 200. The vapor phase final cooler 300 is the core equipment for re-condensing the intermediate vapor-gas mixed medium. Under the suction of the rear-end low-power auxiliary pump 400, the vapor-gas mixed medium discharged by the multi-channel high-efficiency steam jet vacuum pump 200 is drawn into the vapor phase final cooler 300, and then condensed and heat-exchanged with the cooling water transported by the cooling water inlet pipe 302 of the vapor phase final cooler.The recondensation, removal and separation of the vapor phase condensable components in the extracted steam-gas mixed medium are realized, and the remaining small amount of gas phase non-condensable gas is discharged into the rear low-power auxiliary pump 400 through the vapor phase final cooler exhaust pipe 305, and discharged into the atmosphere or the tail gas recovery system. The vacuum pressure in the vapor phase final cooler 300 is monitored by the vapor phase final cooler pressure sensor 304, and is interlocked with the vapor phase final cooler cooling water inlet control valve 303 and the vapor phase final cooler water inlet pressure sensor 304. It is connected to the system controller through a control cable to realize remote monitoring, setting and adjustment of the vacuum pressure in the vapor phase final cooler 300. The system controller 500 is the core control component of the system of the present invention. It usually adopts a programmable controller and the like to connect to the industrial production central control system for data transmission, and realizes the remote monitoring, interlocking control, setting and adjustment of the pressure and control valves at each monitoring point of the system of the present invention.

[0037] As a specific example, please refer to Figure 1 As shown, the control method of the steam-gas mixed medium high vacuum low energy consumption intelligent control system is as follows:

[0038] Step 1: Set the system to automatic operation mode;

[0039] According to the mainstream operation requirements of the industrial production steam-gas mixed medium vacuum suction equipment system, four system automatic operation modes are set in the system controller 500, including performance mode, energy-saving mode, and balanced mode, and each operation mode is designed with its own operating parameter limit range. The automatic operation mode is used for daily normal operation settings, and the system start and stop are manually set;

[0040] Performance mode: namely, the highest suction vacuum mode, which is usually used in high-load conditions or in summer when the ambient temperature is high. It is realized by the automatic control of the two-stage condensation and two-stage high and low vacuum suction combination of the vapor phase precondenser 100, the multi-channel high-efficiency steam jet vacuum pump 200, the vapor phase final cooler 300, and the low-power auxiliary pump 400;

[0041] Energy-saving mode: the lowest energy consumption mode. This mode is usually used in low-load conditions or in winter when the ambient temperature is low. Based on the vacuum pressure set at the system suction port, the system automatically adjusts the condensing cooling water volume of the vapor phase precondenser 100, the steam pressure of the multi-channel high-efficiency steam jet vacuum pump 200, the cooling water volume of the vapor phase final cooler 300, and the operating frequency and current of the low-power auxiliary pump 400 to achieve the best comprehensive water-saving, steam-saving, and electricity-saving performance;

[0042] Balanced mode: a mode that is a balanced match between the optimal suction vacuum performance and the optimal energy consumption performance. This mode is usually used in medium load conditions or in spring and autumn when the ambient temperature is neither high nor low. Based on the set vacuum pressure at the system suction port, the system automatically adjusts the condensing cooling water volume of the vapor phase precondenser 100, the steam pressure of the multi-channel high-efficiency steam jet vacuum pump 200, the cooling water volume of the vapor phase final cooler 300, and the operating frequency and current of the low-power auxiliary pump 400 to achieve energy consumption balance under the set suction vacuum performance;

[0043] Step 2: Monitor the system's automatic operation mode;

[0044] According to the performance parameters of each mode of the system of the present invention, the pressure, temperature and current parameters of each monitoring point under the current operation mode are monitored by the system controller; P0 is the vacuum pressure of the steam extraction port of the vapor phase precondenser 100, P1 is the cooling water inlet pressure of the vapor phase precondenser 100, P3 is the steam pressure of the multi-channel high-efficiency steam ejector vacuum pump 200, P4 is the vacuum pressure in the vapor phase final cooler 300, P5 is the cooling water inlet pressure of the vapor phase final cooler 300, T1 is the cooling water inlet temperature of the vapor phase precondenser 100, T2 is the cooling water outlet temperature of the vapor phase precondenser 100, T3 is the cooling water inlet temperature of the vapor phase final cooler 300, and T4 is the cooling water outlet temperature of the vapor phase final cooler 300;

[0045] Step 3: Determine whether the vacuum and energy consumption parameters of each monitoring point under the set automatic operation mode are reasonable;

[0046] According to the monitoring data of step 2 and the design performance parameters of each mode of the system of the present invention, the system status is judged by comparing the real-time data of the pressure, temperature and other parameters at each point of the system controller 500; pressure judgment, judge in turn whether P0 can reach the set value, the pressure range and adjustment margin of P1, whether P2 reaches the designed vacuum pressure, the pressure range and adjustment margin of P3; P4 vacuum pressure state, P5 pressure range and adjustment margin; temperature judgment: judge in turn whether the temperature difference between T1 and T2 and the range are reasonable, and judge whether the temperature difference range between T3 and T4 is reasonable; current judgment: monitor the operating current size and adjustment margin of the low-power auxiliary pump through the system controller 500;

[0047] Step 4: Adjust and set the operating parameters of each point in the operating mode;

[0048] According to step 1 setting, step 2 monitoring, step 3 judgment, step 4 starts automatic adjustment, realizes the automatic control adjustment in the designed and selected automatic operation mode, and obtains the operation effect of the set automatic operation mode;

[0049] Performance mode adjustment: according to the system operation requirements, within the set parameter range, set the vacuum P0 of the system extraction port in the performance mode; the system controller 500 sequentially adjusts the vapor phase precondenser cooling water inlet control valve 104 to increase the cooling water inlet pressure P1 of the vapor phase precondenser 100, so that the vapor phase precondenser 100 is fully condensed; adjusts the multi-channel high-efficiency steam jet vacuum pump 200 injection steam control valve 203 to increase the multi-channel high-efficiency steam jet vacuum pump 200 injection steam pressure P3, so that the multi-channel high-efficiency steam jet vacuum pump 200 suction port vacuum pressure P2 Improve; adjust the cooling water inlet control valve 303 of the vapor phase final cooler to increase the cooling water inlet pressure P5 of the vapor phase final cooler 300, so that the condensable steam in the vapor phase final cooler 300 is fully condensed; adjust the low-power auxiliary pump air extraction control valve 401 and the low-power auxiliary pump motor frequency to increase the low-power auxiliary pump steam extraction volume and the suction port limit vacuum pressure; when the system steam extraction port vacuum P0 is set under the set performance mode, the system automatically keeps the positions of each control valve stable. If the upper and lower deviations of P0 exceed the design range, it is automatically adjusted to stability according to the above control logic;

[0050] Energy-saving mode adjustment: according to the system operation requirements, within the set parameter range, set the system extraction port vacuum P0 in the performance mode; the system controller 500 sequentially adjusts the vapor phase precondenser cooling water inlet control valve 104, and adjusts the vapor phase precondenser 100 cooling water inlet pressure P1 without affecting P0, thereby reducing the amount of cooling water for the vapor phase precondenser 100 to save water; adjusts the multi-channel high-efficiency steam jet vacuum pump 200 induced steam control valve 203, and adjusts the multi-channel high-efficiency steam jet vacuum pump 200 induced steam pressure P3 without affecting P0, thereby reducing the induced steam consumption of the multi-channel high-efficiency steam jet vacuum pump 200; adjusts the steam The cooling water inlet control valve 303 of the vapor phase final cooler is adjusted down without affecting P0, and the cooling water inlet pressure P5 of the vapor phase final cooler 300 is reduced to reduce the cooling water volume of the vapor phase final cooler 300 to save water; the low-power auxiliary pump air extraction port control valve 401 and the motor frequency of the low-power auxiliary pump 400 are adjusted down, and the power consumption of the low-power auxiliary pump is reduced without affecting P0; the above adjustments are carried out in sequence, and when the system air extraction port vacuum P0 is set under the set performance mode, the system automatically keeps the positions of various control valves stable. If the upper and lower deviations of P0 exceed the design range, the control valves are automatically adjusted up or down according to the above control logic to be stable;

[0051] Balance mode adjustment: according to the system operation requirements, within the set parameter range, set the system steam extraction port vacuum P0 size in the performance mode; the system controller 500 selectively adjusts, firstly adjusts the low-power auxiliary pump air extraction port control valve 401 and the low-power auxiliary pump motor frequency, without affecting P0, to reduce the power consumption of the low-power auxiliary pump 400; secondly, adjusts the multi-channel high-efficiency steam injection vacuum pump induced steam inlet control valve 203, without affecting P0, reduces the induced steam pressure P3 of the multi-channel high-efficiency steam injection vacuum pump 200, and reduces the induced steam pressure P4 of the multi-channel high-efficiency steam injection vacuum pump 200. Steam consumption; if there is still room for adjustment, adjust the vapor phase final cooler cooling water inlet control valve 303 again. Without affecting P0, reduce the vapor phase final cooler 300 cooling water inlet pressure P5, reduce the vapor phase final cooler 300 cooling water volume to save water; finally, if there is still room for adjustment, adjust the vapor phase precondenser cooling water inlet control valve 104 again. Without affecting P0, reduce the vapor phase precondenser 100 cooling water inlet pressure P1, reduce the vapor phase precondenser 100 cooling water volume to save water; Finally, without affecting P0, the system automatically adjusts to the best balance between performance and energy consumption.

[0052] As a specific example, please refer to Figure 1 As shown, the described high-vacuum and low-energy intelligent control system and control method for a steam-gas mixed medium can remotely adjust the vacuum of the steam extraction port of the vapor phase precondenser 100, the vacuum of the steam extraction port of the multi-channel high-efficiency steam jet vacuum pump 200, and the vacuum performance inside the vapor phase final cooler 300 through the system controller 500 and the production central control system according to the ambient temperature in different seasons and different production load and condensation load conditions. At the same time, it can also automatically control the water consumption, steam consumption, and power consumption of the system to achieve the most efficient or most economical operation of the system of the present invention and achieve the optimal balance between comprehensive performance and energy consumption.

[0053] As a specific example, please refer to Figure 1 As shown, the vapor phase precondenser 100 and the vapor phase final cooler 300 usually adopt a partition-type or direct-cooling vapor phase capture condensation structure according to the production operation or transformation conditions. When low-level installation (installation height ≤ 6m) is required or the vapor-phase condensable vapor medium needs to be separated separately, a partition-type vapor phase capture condenser is adopted, and a condensate drainage pump is required to overcome the vacuum pressure in the vapor phase precondenser 100 and the vapor phase final cooler 300 to achieve the separation of cold and hot media and the separate separation and recovery of the vapor-phase condensable vapor medium. When high-level installation (installation height ≥ 10m) is adopted or the vapor-phase condensable medium does not need to be separated and recovered separately, a direct mixed condensation vapor phase capture condensation structure is adopted to obtain better heat exchange condensation efficiency and consume less cooling liquid medium.

[0054] As a specific example, please refer to Figure 1As shown, the multi-channel high-efficiency steam jet vacuum pump 200 has 2-5 channels and 2-5 nozzles according to the production operation or transformation conditions. The working steam pressure adjustment range for injection is 0-0.5MPa, and the adjustment method is manual or automatic. The maximum vacuum range of the multi-channel high-efficiency steam jet vacuum pump 200 is 0.5-3KPa.

[0055] Compared with the prior art, the steam-gas mixed medium high vacuum low energy consumption intelligent control system and control method provided by the present invention have the following advantages:

[0056] 1. The present invention solves the technical problems in the industry, that is, it innovatively adopts the system technology of pre-condensation + high-vacuum steam injection extraction + recondensation + low-consumption auxiliary extraction, and realizes the effective separation of the system of condensation of condensable steam and extraction of non-condensable steam in the steam-gas mixed medium. It solves the industry problems of mechanical vacuum pumps and other products in the prior art when extracting high condensable steam ratio conditions in the steam-gas mixed medium, such as medium unsuitability, low vacuum and high energy consumption. It can significantly improve the system vacuum and reduce the system energy consumption.

[0057] 2. The present invention solves the pain points of industry users. The present invention adopts a "one-button automatic control" operation mode and innovatively designs three automatic control operation modes: performance mode, energy-saving mode, and balanced mode. It solves the problems of steam-gas mixed medium vacuum suction system, traditional vacuum equipment has poor adjustability and single control, and solves the pain points of industry users for more intelligent operation and more refined operation management.

[0058] 3. The vacuum performance, energy-saving performance and reliability of the system of the present invention are greatly improved. The present invention adopts a supersonic multi-channel high-efficiency steam jet vacuum pump to obtain high vacuum performance, adopts a low-consumption auxiliary mechanical pump to assist in pumping non-condensable steam, and adopts a multi-stage high-efficiency condenser to condense condensable steam. The actual operating limit vacuum reaches 0.65-3KPa, which is better than the vacuum performance of more than 5KPa of traditional mechanical pumps. At the same time, the power consumption of the system is reduced by 50-70% compared with the traditional mechanical vacuum pump. The main condensation high vacuum equipment of the system is static equipment, and the system reliability is better than the traditional single mechanical vacuum product.

[0059] 4. The present invention is designed for the vacuum suction characteristics of steam-gas mixed media, and can be widely used in multiple-effect evaporation systems, steam turbine condensation systems, chemical distillation systems, etc., and can obtain higher vacuum performance than traditional mechanical pumps, thereby reducing the cold-end back pressure of the user's evaporation system, condensation system, distillation system, etc., thereby significantly improving the thermal energy utilization efficiency of the front-end system, improving production intensity or production efficiency, and increasing production and efficiency. Therefore, the present invention can create significant economic benefits, social benefits, energy-saving and environmental protection benefits.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A steam-gas mixed medium high vacuum low energy consumption intelligent control system and control method, characterized in that: It includes a vapor phase precondenser, a vapor phase precondenser steam extraction port pressure sensor, a vapor phase precondenser cooling water inlet control valve, a vapor phase precondenser cooling water inlet pressure sensor, a multi-channel high-efficiency steam jet vacuum pump, a multi-channel high-efficiency steam jet vacuum pump steam extraction port pressure sensor, a multi-channel high-efficiency steam jet vacuum pump induced steam inlet control valve, a multi-channel high-efficiency steam jet vacuum pump induced steam pressure sensor, a vapor phase final cooler, a vapor phase final cooler pressure sensor, a vapor phase final cooler cooling water inlet control valve, a vapor phase final cooler water inlet pressure sensor, a low-power auxiliary pump, a low-power auxiliary pump exhaust port control valve, and a system controller. The vapor phase precondenser is a vapor phase condensable medium pre-condensing device. Under the suction of the rear-end multi-channel high-efficiency steam jet vacuum pump and the low-power auxiliary pump, the vapor-gas mixed medium is condensed through the vapor phase precondenser extraction pipe It is pumped into the vapor phase precondenser and then condensed and heat exchanged with the cooling water transported by the cooling water inlet pipe of the vapor phase precondenser, so as to realize the pre-condensation, removal and separation of the vapor phase condensable components in the extracted vapor-gas mixed medium, greatly reduce the volume of the vapor-gas mixed medium, and reduce the suction load of the rear-end vacuum equipment. The remaining vapor-phase non-condensable gas is discharged into the multi-channel high-efficiency steam jet vacuum pump through the vapor phase precondenser exhaust pipe. The suction vacuum pressure of the vapor phase precondenser is monitored by the vapor phase precondenser extraction port pressure sensor, and is interlocked with the vapor phase precondenser cooling water inlet control valve and the vapor phase precondenser cooling water inlet pressure sensor, and is connected to the system controller through a control cable to realize remote monitoring, setting and adjustment of the suction vacuum pressure of the vapor phase precondenser. The multi-channel high-efficiency steam jet vacuum pump provides a core device with high vacuum performance for this device. The inventor's original multi-channel multi-nozzle steam injection vacuum equipment is adopted, and the medium and low pressure working steam transported by the steam inlet pipe of the multi-channel high-efficiency steam injection vacuum pump is used to generate multiple supersonic airflows, and the gas phase non-condensable gas discharged from the exhaust pipe of the vapor phase pre-condenser is injected. The steam-gas mixed medium is discharged into the vapor phase final cooler through the mixed steam exhaust pipe of the multi-channel high-efficiency steam injection vacuum pump. The suction vacuum pressure of the multi-channel high-efficiency steam injection vacuum pump is monitored by the multi-channel high-efficiency steam injection vacuum pump exhaust port pressure sensor, and is interlocked with the multi-channel high-efficiency steam injection vacuum pump injection steam inlet control valve and the multi-channel high-efficiency steam injection vacuum pump injection steam pressure sensor, and is connected to the system controller through a control cable to realize remote monitoring, setting and adjustment of the suction vacuum pressure of the multi-channel high-efficiency steam injection vacuum pump. The vapor phase final cooler is The core equipment for re-condensing the intermediate steam-gas mixed medium, under the suction of the rear-end low-power auxiliary pump, the steam-gas mixed medium discharged by the multi-channel high-efficiency steam jet vacuum pump is pumped into the vapor phase final cooler, and then condensed and heat-exchanged with the cooling water transported by the cooling water inlet pipe of the vapor phase final cooler, so as to realize the re-condensation, removal and separation of the vapor phase condensable components in the extracted steam-gas mixed medium, and the remaining small amount of gas phase non-condensable gas is discharged into the rear-end low-power auxiliary pump through the vapor phase final cooler exhaust pipe, and then discharged into the atmosphere or the tail gas recovery system. The vacuum pressure in the vapor phase final cooler is monitored by the vapor phase final cooler pressure sensor, and is interlocked with the vapor phase final cooler cooling water inlet control valve and the vapor phase final cooler water inlet pressure sensor, and is connected to the system controller through the control cable to realize the remote monitoring, setting and adjustment of the vacuum pressure in the vapor phase final cooler.The system controller is the core control component of the system of the present invention. It usually uses a programmable controller to connect to the industrial production central control system for data transmission, and realizes the remote monitoring, interlocking control, setting, and adjustment functions of the pressure and control valves at each monitoring point of the system of the present invention.

2. A steam-gas mixed medium high vacuum low energy consumption intelligent control system and control method according to claim 1, characterized in that: The control method of the steam-gas mixed medium high vacuum low energy consumption intelligent control system is as follows: Step 1: Set the system to automatic operation mode; According to the mainstream operation requirements of the industrial production steam-gas mixed medium vacuum suction equipment system, four system automatic operation modes are set in the system controller, including performance mode, energy-saving mode, and balanced mode, and each operation mode is designed with its own operating parameter limit range. The automatic operation mode is used for daily normal operation settings, and the system start and stop are manually set; Performance mode: the highest suction vacuum mode, which is usually used in high-load conditions or in summer when the ambient temperature is high. It is achieved through the automatic control of two-stage condensation and two-stage high and low vacuum suction combination of vapor phase precondenser, multi-channel high-efficiency steam jet vacuum pump, vapor phase final cooler, and low-power auxiliary pump; Energy-saving mode: the lowest energy consumption mode. This mode is usually used in low-load conditions or in winter when the ambient temperature is low. Based on the vacuum pressure set at the system suction port, the system automatically adjusts the condensing cooling water volume of the vapor phase precondenser, the steam pressure of the multi-channel high-efficiency steam jet vacuum pump, the cooling water volume of the vapor phase final cooler, and the operating frequency and current of the low-power auxiliary pump to achieve the best comprehensive water-saving, steam-saving, and electricity-saving performance; Balanced mode: a mode that is a balanced match between the optimal suction vacuum performance and the optimal energy consumption performance. This mode is usually used in medium load conditions or in spring and autumn when the ambient temperature is neither high nor low. Based on the set vacuum pressure at the system suction port, the system automatically adjusts the condensing cooling water volume of the vapor phase precondenser, the steam pressure of the multi-channel high-efficiency steam jet vacuum pump, the cooling water volume of the vapor phase final cooler, and the operating frequency and current of the low-power auxiliary pump to achieve energy consumption balance under the set suction vacuum performance; Step 2: Monitor the system's automatic operation mode; According to the performance parameters of each mode of the system of the present invention, the pressure, temperature and current parameters of each monitoring point under the current operation mode are monitored by the system controller; P0 is the vacuum pressure of the steam extraction port of the vapor phase precondenser, P1 is the cooling water inlet pressure of the vapor phase precondenser, P3 is the steam pressure of the multi-channel high-efficiency steam ejector vacuum pump, P4 is the vacuum pressure in the vapor phase final cooler, P5 is the cooling water inlet pressure of the vapor phase final cooler, T1 is the cooling water inlet temperature of the vapor phase precondenser, T2 is the cooling water outlet temperature of the vapor phase precondenser, T3 is the cooling water inlet temperature of the vapor phase final cooler, and T4 is the cooling water outlet temperature of the vapor phase final cooler; Step 3: Determine whether the vacuum and energy consumption parameters of each monitoring point under the set automatic operation mode are reasonable; According to the monitoring data of step 2 and the design performance parameters of each mode of the system of the present invention, the system status is judged by comparing the real-time data of pressure and temperature parameters at each point of the system controller; pressure judgment, judge in turn whether P0 can reach the set value, the range and adjustment margin of P1 pressure, whether P2 reaches the designed vacuum pressure, the range and adjustment margin of P3 pressure; P4 vacuum pressure state, P5 pressure range and adjustment margin; temperature judgment: judge in turn whether the temperature difference between T1 and T2 is reasonable, and judge whether the temperature difference between T3 and T4 is reasonable; current judgment: monitor the operating current size and adjustment margin of the low-power auxiliary pump through the system controller; Step 4: Adjust and set the operating parameters of each point in the operating mode; According to step 1 setting, step 2 monitoring, step 3 judgment, step 4 starts automatic adjustment, realizes the automatic control adjustment in the designed and selected automatic operation mode, and obtains the operation effect of the set automatic operation mode; Performance mode adjustment: according to the system operation requirements, within the set parameter range, set the system steam extraction port vacuum P0 size under the performance mode; the system controller adjusts the vapor precondenser cooling water inlet control valve in turn to increase the vapor precondenser cooling water inlet pressure P1, so that the vapor precondenser is fully condensed; adjust the multi-channel high-efficiency steam jet vacuum pump induced steam inlet control valve to increase the multi-channel high-efficiency steam jet vacuum pump induced steam pressure P3 to increase the multi-channel high-efficiency steam jet vacuum pump suction port vacuum pressure P2; adjust the vapor phase final cooler cooling water inlet control valve to increase the vapor phase final cooler cooling water inlet pressure P5 to fully condense the condensable steam in the vapor phase final cooler; adjust the low-power auxiliary pump suction port control valve and the low-power auxiliary pump motor frequency to increase the low-power auxiliary pump extraction volume and suction port limit vacuum pressure; when the system steam extraction port vacuum P0 is set under the set performance mode, the system automatically keeps the positions of each control valve stable. If the upper and lower deviations of P0 exceed the design range, it will automatically adjust to stability according to the above control logic; Energy-saving mode adjustment: according to the system operation requirements, within the set parameter range, set the system extraction port vacuum P0 size in the performance mode; the system controller sequentially adjusts the vapor precondenser cooling water inlet control valve, and adjusts the vapor precondenser cooling water inlet pressure P1 without affecting P0, thereby reducing the amount of cooling water for the vapor precondenser to save water; adjusts the multi-channel high-efficiency steam jet vacuum pump induced steam inlet control valve, and adjusts the multi-channel high-efficiency steam jet vacuum pump induced steam pressure P3 without affecting P0, thereby reducing the induced steam consumption of the multi-channel high-efficiency steam jet vacuum pump; adjusts the vapor phase final cooling The cooling water inlet control valve of the vapor phase final cooler can be adjusted down to P5 without affecting P0, so as to reduce the cooling water volume of the vapor phase final cooler and save water; the low-power auxiliary pump air extraction port control valve and the motor frequency of the low-power auxiliary pump can be adjusted down to reduce the power consumption of the low-power auxiliary pump without affecting P0; the above adjustments are carried out in sequence, and when the system air extraction port vacuum P0 is set under the set performance mode, the system automatically keeps the positions of various control valves stable. If the upper and lower deviations of P0 exceed the design range, the control valves are automatically adjusted up or down according to the above control logic to be stable; Balance mode adjustment: according to the system operation requirements, within the set parameter range, set the system steam extraction port vacuum P0 size in the performance mode; the system controller selectively adjusts it, firstly adjusts the low-power auxiliary pump air extraction port control valve and the low-power auxiliary pump motor frequency, without affecting P0, to reduce the low-power auxiliary pump power consumption; secondly, adjusts the multi-channel high-efficiency steam injection vacuum pump induced steam inlet control valve, without affecting P0, reduces the multi-channel high-efficiency steam injection vacuum pump induced steam pressure P3, reduces the multi-channel high-efficiency steam injection vacuum pump induced steam pressure P4. Steam consumption; if there is still room for adjustment, adjust the vapor phase final cooler cooling water inlet control valve again. Without affecting P0, reduce the vapor phase final cooler cooling water inlet pressure P5, reduce the vapor phase final cooler cooling water volume to save water; finally, if there is still room for adjustment, adjust the vapor phase precondenser cooling water inlet control valve again. Without affecting P0, reduce the vapor phase precondenser cooling water inlet pressure P1, reduce the vapor phase precondenser cooling water volume to save water; Finally, without affecting P0, the system automatically adjusts to the best balance between performance and energy consumption.

3. A steam-gas mixed medium high vacuum low energy consumption intelligent control system and control method according to claim 1, characterized in that: The described high-vacuum, low-energy intelligent control system and control method for a steam-gas mixed medium can remotely adjust the vacuum at the steam extraction port of a vapor phase precondenser, the vacuum at the steam extraction port of a multi-channel high-efficiency steam jet vacuum pump, and the vacuum performance in a vapor phase final cooler through a system controller and a production central control system according to the ambient temperature in different seasons and different production load and condensation load conditions. At the same time, it can also automatically regulate the water consumption, steam consumption, and power consumption of the system to achieve the most efficient or most economical operation of the system of the present invention and achieve the optimal balance between comprehensive performance and energy consumption.

4. A steam-gas mixed medium high vacuum low energy consumption intelligent control system and control method according to claim 1, characterized in that: The vapor phase precondenser and vapor phase final cooler usually adopt a partition-type or direct-cooling vapor phase capture and condensation structure according to the production operation or transformation conditions. When low-level installation (installation height ≤ 6m) is required or the vapor phase condensable medium needs to be separated separately, a partition-type vapor phase capture condenser is adopted, and a condensate drainage pump is required to overcome the vacuum pressure in the vapor phase precondenser and the vapor phase final cooler to achieve the separation of cold and hot media and the separate separation and recovery of the vapor phase condensable medium. When high-level installation (installation height ≥ 10m) is adopted or the vapor phase condensable medium does not need to be separated and recovered separately, a direct mixed condensation vapor phase capture and condensation structure is adopted to obtain better heat exchange condensation efficiency and consume less coolant medium.

5. The high vacuum and low energy consumption intelligent control system and control method of a steam-gas mixed medium according to claim 1, characterized in that: The multi-channel high-efficiency steam jet vacuum pump has 2-5 channels and 2-5 nozzles according to the production operation or transformation conditions. The working steam pressure adjustment range for injection is 0-0.5MPa, and the adjustment method is manual or automatic system adjustment. The maximum vacuum range of the multi-channel high-efficiency steam jet vacuum pump is 0.5-3KPa.

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