Steam generation system and pressure cascade early warning regulation and control method thereof

Abstract

The invention relates to the technical field of energy utilization and energy storage, and discloses a steam generation system and a pressure cascade early warning regulation and control method thereof, and the system comprises a heat pump device, a water storage device, an energy storage device and a desuperheater; a water feeding pump set and a mother pipe adjusting valve set are arranged on a main water inlet pipeline connecting the energy storage device and the water storage device, and the mother pipe adjusting valve set is used for conducting PID adjustment on the flow of high-temperature water according to pressure data collected by pressure monitoring points arranged in a system pipeline so as to keep the pressure of a steam pipeline stable. A desuperheating water adjusting valve is arranged on a desuperheating water pipeline connecting the water storage device and the desuperheater, and the desuperheating water adjusting valve is used for conducting PID adjustment on the flow of desuperheating water according to temperature data collected by a temperature monitoring point arranged in a system pipeline so as to keep the steam temperature stable. According to the method, adjustment is conducted in the system generation process by combining system water supply amount adjustment and circulation pipeline design, energy is more effectively utilized, and system safety is protected.

Description

Technical Field

[0001] This application relates to the technical field of energy utilization and energy storage, and more particularly, to a steam generation system and a pressure step warning and regulation method thereof. Background Art

[0002] A steam generation system that couples a heat pump and a molten salt energy storage device is an efficient, flexible and safe energy utilization system that combines heat pump and molten salt energy storage technologies and is mainly used in fields such as industrial steam supply and cogeneration. This system generates heat through a heat pump unit and heats low-temperature water to raise it to a high temperature to form high-temperature water. The molten salt module is filled with a heat storage medium and equipped with heat exchange pipelines. The heat storage medium heats up the molten salt and stores heat. When steam needs to be generated, the high-temperature water is sent to the steam generation unit, and the heat of the high-temperature molten salt is transferred to the high-temperature water through the heat exchange pipeline to generate high-temperature and high-pressure steam.

[0003] However, in actual operation, the steam flow rate at the user end (the steam system usage end) will affect the stability of the pressure at the steam system supply end. The steam consumption on the user side is unstable, and the steam consumption fluctuates between 0 and 100%, resulting in fluctuations in steam pressure. The steam generation system generally operates under high temperature and high pressure conditions. Once the pressure exceeds the design limit of the equipment, serious accidents such as pipe bursts and explosions may occur. Therefore, when designing and operating a steam generation system, these potential risks must be fully considered, and the automation monitoring of the system must be strengthened by installing reliable safety valves and pressure and temperature monitoring points to ensure the safety and reliability of the system. Summary of the Invention

[0004] In order to solve the above technical problems, this application discloses a steam generation system and a pressure step warning and regulation method thereof. Temperature and pressure monitoring modules and valve component regulation modules can be set on the main and branch pipelines where the heat pump and the molten salt module are connected in the system, so as to more efficiently and safely improve the hierarchical and branch-by-branch implementation of pressure warning and regulation. The steam pressure warning and regulation of the system in this application are combined with PID regulation. By adjusting the desuperheated water flow rate, the steam temperature is controlled, and by adjusting the water supply volume, the steam pressure is adjusted, thereby realizing high adaptability, safety and high energy utilization rate of the system. Specifically, the technical solutions of this application are as follows:

[0005] In a first aspect, this application discloses a steam generation system, including: a heat pump device, a water storage device, an energy storage device, and a desuperheater;

[0006] The heat pump device is used to provide heat to heat water to form high-temperature water at a first temperature; the water storage device is connected to the heat pump device and is used to store the high-temperature water;

[0007] The energy storage device is connected to the water storage device through a main water inlet pipe, and is used to receive the high-temperature water and further heat the high-temperature water to generate first steam at a second temperature;

[0008] The desuperheater is connected to the energy storage device through a first steam pipe and is used to receive the first steam; the desuperheater is connected to the water storage device through a desuperheating water pipe and is used to receive desuperheating water; the desuperheater generates second steam at a third temperature based on the first steam and the desuperheating water, and outputs it through a second steam pipe; the third temperature is lower than the second temperature;

[0009] A feed water pump group and a main pipe regulating valve group are arranged on the main water inlet pipe, and the main pipe regulating valve group is used to perform PID regulation on the flow rate of the high-temperature water according to the pressure data collected by a pressure monitoring point arranged in the system pipeline, so as to maintain the stability of the steam pipeline pressure;

[0010] A desuperheating water regulating valve is arranged on the desuperheating water pipe, and the desuperheating water regulating valve is used to perform PID regulation on the flow rate of the desuperheating water according to the temperature data collected by a temperature monitoring point arranged in the system pipeline, so as to maintain the stability of the steam temperature.

[0011] In some embodiments, the energy storage device includes a plurality of energy storage modules;

[0012] The plurality of energy storage modules are connected in parallel to form a plurality of steam generation paths;

[0013] The water inlets of the plurality of energy storage modules are respectively connected to the main water inlet pipe through a plurality of branch water inlet pipes; a branch pipe regulating valve group and a first electric shut-off valve are arranged on each branch water inlet pipe, and the branch pipe regulating valve group is used to control the same flow rate of the high-temperature water entering each energy storage module;

[0014] The steam outlets of the plurality of energy storage modules are respectively connected to the first steam pipe through a plurality of branch steam pipes; a first mechanical safety valve is arranged on each branch steam pipe to control the air pressure in the branch steam pipe.

[0015] In some embodiments, a first pressure monitoring point is arranged on the main water inlet pipe;

[0016] A second pressure monitoring point is arranged on each branch steam pipe;

[0017] A third pressure monitoring point is arranged near the desuperheater on the second steam pipe;

[0018] A fourth pressure monitoring point is arranged near the desuperheater on the desuperheating water pipe;

[0019] Each of the branch steam pipes is further provided with a first temperature monitoring point;

[0020] At the position where the first steam pipe is close to the desuperheater, and at the position where the second steam pipe is close to the desuperheater, a second temperature monitoring point is further provided.

[0021] In some embodiments, a first overpressure relief valve and a second mechanical safety valve are provided on the second steam pipe for controlling the air pressure in the second steam pipe.

[0022] In some embodiments, a steam generation system further includes: a voltage stabilizing device;

[0023] The steam outlets of the multiple energy storage modules are respectively connected to the voltage stabilizing device through multiple branch steam pipes, so that the energy storage modules supply the first steam to the voltage stabilizing device;

[0024] The voltage stabilizing device is connected to the steam input port of the desuperheater through the first steam pipe, and is used for inputting the first steam into the desuperheater after voltage stabilizing treatment.

[0025] In some embodiments, a steam generation system further includes: a recirculation branch;

[0026] The recirculation branch is led out between the main pipe regulating valve group and the energy storage module and is connected to the water storage device for realizing the reflux of the high-temperature water during system operation;

[0027] A recirculation valve group is provided on the recirculation branch for controlling the flow rate of the reflux high-temperature water.

[0028] In some embodiments, a steam generation system further includes: a blowdown pipeline;

[0029] The blowdown pipeline is connected to the water inlet of the energy storage module and communicates with a blowdown well;

[0030] A blowdown valve group is installed on the blowdown pipeline; the blowdown valve group at least includes a first manual shut-off valve and a second electric shut-off valve;

[0031] When the energy storage module is working, the second electric shut-off valve is closed; when the machine is stopped, the second electric shut-off valve is opened so as to discharge the residual working medium in the energy storage device to the blowdown well through the residual pressure.

[0032] Second, the present application also discloses a pressure cascade early warning and regulation method for a steam generation system. The implementation of the method is based on a steam generation system in the above embodiments, and specifically includes the following steps:

[0033] Monitor the steam pipeline pressure on each main / branch pipeline through the pressure monitoring points; based on the expected steam pressure threshold, and in combination with the PID (Proportional Integral Derivative) control method, gradually adjust the opening degree of the main pipe regulating valve group; to adjust the inlet flow rate of the high-temperature water, thereby adjusting the steam generation amount and controlling the stability of the steam pipeline pressure;

[0034] Monitor the temperature of the output steam through the temperature monitoring points, and based on the expected steam temperature threshold, in combination with the PID control method, gradually adjust the opening degree of the desuperheating water regulating valve; to adjust the flow rate of the desuperheating water, thereby controlling the stability of the steam temperature.

[0035] In some embodiments, the pressure cascade early warning and regulation method of the steam generation system further includes: based on the pressure data of the third pressure monitoring point, controlling the opening degree of the recirculation valve group to perform primary pressure regulation early warning;

[0036] Specifically, it includes the following steps:

[0037] Obtain the pressure data of the third pressure monitoring point and determine whether it exceeds the first warning pressure;

[0038] If so, control the recirculation valve group on the recirculation branch to open; so that the high-temperature water flows back into the water storage device. At this time, the main water inlet pipeline no longer supplies water to the energy storage device, the energy storage device suspends steam production, and the pressure at the third pressure monitoring point drops;

[0039] Continuously monitor the pressure data of the third pressure monitoring point and determine whether it drops to the first safety pressure;

[0040] If so, control the recirculation valve group to close; at this time, the main water inlet pipeline continues to supply water to the energy storage device, and the energy storage device resumes steam production.

[0041] In some embodiments, the pressure cascade early warning and regulation method of the steam generation system further includes: based on the pressure data of the second pressure monitoring point, controlling the opening degree of the first overpressure relief valve to perform secondary pressure regulation early warning;

[0042] Specifically, it includes the following steps:

[0043] Obtain the pressure data of the second pressure monitoring point and determine whether it exceeds the second warning pressure;

[0044] If so, control the first overpressure relief valve on the second steam pipeline to open; the steam in the second steam pipeline is released for pressure relief, so that the pressure at the second pressure monitoring point drops;

[0045] Continuously monitor the pressure data at the second pressure monitoring point and determine whether it drops to the second safety pressure;

[0046] If so, control the first overpressure relief valve to close.

[0047] In some embodiments, the pressure cascade early warning and regulation method of the steam generation system further includes: based on the pressure data at the second pressure monitoring point, closing the feed water pump group and controlling the blowdown valve group to open for three - stage pressure regulation early warning;

[0048] Specifically, it includes the following steps:

[0049] Obtain the pressure data at the second pressure monitoring point and determine whether it exceeds the third warning pressure;

[0050] If so, control to close the feed water pump group and open the blowdown valve group; at this time, the main water inlet pipe no longer supplies water to the energy storage device, the energy storage device suspends steam production, and the pressure at the second pressure monitoring point drops. The blowdown valve group is opened so as to discharge the working medium in the energy storage module through the blowdown pipe to reduce the pressure.

[0051] In some embodiments, the pressure cascade early warning and regulation method of the steam generation system further includes: based on the pressure data at the third pressure monitoring point, controlling the opening degree of the mechanical safety valve for four - stage pressure regulation early warning;

[0052] Specifically, it includes the following steps:

[0053] Obtain the pressure data at the third pressure monitoring point and determine whether it exceeds the fourth warning pressure;

[0054] If so, the first mechanical safety valve automatically pops up to release and relieve the pressure of the steam in each branch steam pipe; the second mechanical safety valve automatically pops up to release and relieve the pressure of the steam in the second steam pipe.

[0055] Compared with the prior art, the present application has at least one of the following beneficial effects:

[0056] 1. The system of the present application couples the heat pump device with the energy storage device, and the energy storage device is a parallel pipeline of multiple single - tank molten salt heat storage modules. While improving the system energy efficiency, temperature and pressure monitoring modules and valve component regulation modules can be set on both the main and branch pipelines where the heat pump is connected to the molten salt module, which can more efficiently and safely achieve pressure early warning and regulation in a hierarchical and branched manner for the system.

[0057] 2. This application method combines the system water supply adjustment and circulation pipeline design to make adjustments during system operation, making more efficient use of energy and protecting system safety. Combined with control and PID regulation, the steam temperature is controlled by adjusting the desuperheating water flow rate, and the steam pressure is adjusted by adjusting the water supply, thereby achieving high system adaptability, safety and high energy utilization.

[0058] 3. This application significantly improves the safety and stability of system operation through a four-level pressure warning design. When the steam pressure fluctuates, the first warning responds quickly to stabilize the pressure by adjusting the recirculation pipeline; the second warning relieves the pressure by opening the overpressure relief valve after the desuperheater to exhaust steam to the air; during the third warning, the system enters an emergency shutdown state, while controlling the opening of the overpressure relief valve and closing the feedwater pump group to quickly reduce the pressure; the fourth warning ensures that the system and equipment are protected from damage in extreme cases through the automatic tripping of the mechanical safety valve. This multi-level pressure warning mechanism is progressive, which not only realizes the precise control of pressure regulation, but also provides multiple safety guarantees for system operation, significantly reduces the risks caused by overpressure, and extends the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present application.

[0060] Figure 1 This is a structural schematic diagram of an embodiment of a steam generation system of the present application;

[0061] Figure 2 This is a structural schematic diagram of another embodiment of a steam generation system of the present application;

[0062] Figure 3 A flowchart of the steps of an embodiment of a pressure step warning and control method for a steam generation system of the present application;

[0063] Figure 4 This is a flow chart of the steps of another embodiment of a pressure step warning and control method for a steam generation system of the present application.

[0064] 10 - Heat pump device, 20 - Water storage device, 30 - Energy storage device; 31, 32, 33 - Energy storage modules; 40 - Desuperheater; 50 - Voltage stabilizing device; G1 - Main water inlet pipe; G11 - Branch water inlet pipe; G12 - Recirculation branch; G2 - First steam pipe; G21 - Branch steam pipe; G3 - Second steam pipe; G4 - Desuperheating water pipe; G5 - Drainage pipe; L1 - Feed pump group; L2 - Main pipe regulating valve group; L3 - Branch pipe regulating valve group; L4 - First electric shut-off valve; L5 - First mechanical safety valve; L6 - First overpressure relief valve; L7 - Second mechanical safety valve; L8 - Recirculation valve group; L9 - Drainage valve group; J1 - First pressure monitoring point; J2 - Second pressure monitoring point; J3 - Third pressure monitoring point; J4 - Fourth pressure monitoring point; J5 - First temperature monitoring point; J6 - Second temperature monitoring point. Detailed implementation mode

[0065] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0066] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or combinations.

[0067] To make the drawings concise, only the parts related to the invention are schematically shown in each drawing, and they do not represent their actual structures as products. Additionally, to make the drawings concise and easy to understand, in some drawings, components with the same structure or function are only schematically shown as one of them, or only one of them is labeled. In this document, "one" not only means "only this one", but also can mean "more than one" situation.

[0068] It should be further understood that the term "and / or" used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0069] In this text, it should be noted that unless otherwise clearly stipulated and defined, the terms "installation", "connection", and "coupling" 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 an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0070] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0071] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation manners of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings and other implementation manners can also be obtained.

[0072] The steam generation system coupled by a heat pump and a molten salt energy storage device is an efficient, flexible and safe energy utilization system, which combines heat pump and molten salt energy storage technologies and is mainly used in fields such as industrial steam supply and cogeneration. This system generates heat through a heat pump unit and heats low-temperature water to raise it to a high temperature to form high-temperature water. The molten salt module is filled with a heat storage medium and equipped with heat exchange pipelines. The heat storage medium heats up the molten salt and stores heat. When steam needs to be generated, the high-temperature water is sent to the steam generation unit, and the heat of the high-temperature molten salt is transferred to the high-temperature water through the heat exchange pipelines to generate high-temperature and high-pressure steam.

[0073] The coupling of heat pump technology and molten salt energy storage device improves the energy utilization efficiency and reduces the dependence on traditional fossil fuels. It shows good economic and environmental benefits in practical applications and further reduces carbon emissions.

[0074] However, in actual operation, the steam flow rate at the user end (the steam system usage end) will affect the stability of the pressure at the supply end of the steam system. The steam consumption on the user side is unstable, and the steam consumption fluctuates between 0 and 100%, resulting in fluctuations in the steam pressure. The steam generation system generally operates under high-temperature and high-pressure conditions. Once the pressure exceeds the design limit of the equipment, serious accidents such as pipe bursting and explosion may occur. In addition, there are other problems in the steam generation system. For example, the automatic control system may have alarm failures, resulting in the equipment operating in an abnormal state and further causing safety accidents. At the same time, the furnace tubes of some steam generators may have problems such as aging, corrosion or scaling due to long-term operation, further reducing the safety and service life of the equipment.

[0075] In the existing technology, in a common steam generation system, pressure relief protection for steam pressure is achieved by installing a safety valve, or control is carried out by adjusting the molten salt flow rate and molten salt temperature. However, it does not combine the regulation of the system water supply and the design of the circulation pipeline for adjustment during system generation. Therefore, energy is not utilized more effectively and the system safety is not protected. The reason may be that the system with full coupling of the heat pump and molten salt has not been fully popularized and studied, and the design of the circulation pipeline has not been considered either; the structure of the system makes the gradient and precision control of the steam pressure early warning and regulation of the system relatively single.

[0076] In order to avoid the generation of system safety risks caused by unstable pressure in the steam generation system, a steam generation system in this application comprehensively considers the flexible energy utilization requirements on the user side, system energy supply regulation, and system pressure safety protection. This application takes the system's response to different demand changes as the center and conducts an overall design with system hierarchical regulation and pressure protection. The system uses the coupling of the heat pump and the molten salt module, and parallel pipelines are provided for multiple single-tank molten salt thermal energy storage modules. While improving the system energy efficiency, temperature and pressure monitoring modules and valve component control modules can be set on the main and branch pipelines where the heat pump and the molten salt module are connected, so as to more efficiently and safely improve the hierarchical and branched pressure early warning and regulation of the system. This application combines the regulation of the system water supply and the design of the circulation pipeline for adjustment during system generation, more effectively utilizes energy and protects system safety. The steam pressure early warning and regulation of the system are combined with PID regulation. By adjusting the desuperheated water flow rate, the steam temperature is controlled, and by adjusting the water supply, the steam pressure is regulated, thereby achieving high adaptability, safety and high energy utilization rate of the system.

[0077] Refer to the attached Figure 1 As shown in the figure, an embodiment of a steam generation system in this application specifically includes: a heat pump device, a water storage device, an energy storage device, and a desuperheater.

[0078] The heat pump device is used to provide heat to heat water to form high-temperature water at a first temperature. The water storage device is connected to the heat pump device and is used to store the high-temperature water.

[0079] The energy storage device is connected to the water storage device through a main water inlet pipeline and is used to receive the high-temperature water and further heat the high-temperature water to generate first steam at a second temperature.

[0080] The desuperheater is connected to the energy storage device through a first steam pipeline and is used to receive the first steam. The desuperheater is connected to the water storage device through a desuperheated water pipeline and is used to receive desuperheated water. The desuperheater generates second steam at a third temperature based on the first steam and the desuperheated water and outputs it through a second steam pipeline. The third temperature is lower than the second temperature.

[0081] A feed water pump group and a main pipe regulating valve group are provided on the main water inlet pipe. The main pipe regulating valve group is used to perform PID regulation on the flow rate of the high-temperature water according to the pressure data collected by the pressure monitoring points arranged in the system pipeline, so as to maintain the stability of the steam pipeline pressure.

[0082] A desuperheating water regulating valve is provided on the desuperheating water pipe. The desuperheating water regulating valve is used to perform PID regulation on the flow rate of the desuperheating water according to the temperature data collected by the temperature monitoring points arranged in the system pipeline, so as to maintain the stability of the steam temperature.

[0083] Specifically, the system structure of this application refers to the attached Figure 1 As shown in the figure, the steam generation system includes a heat pump device 10, a water storage device 20, an energy storage device 30, and various pipelines and control components connected thereto. The heat pump device 10 and the energy storage device 30 achieve efficient energy transfer and hierarchical utilization through the water storage device 20. Specifically, the heat pump device 10 is used to heat water to a first temperature during off-peak electricity periods. The first temperature is the temperature of high-temperature water close to the saturation temperature, and the high-temperature water is transported to the water storage device 20. The water storage device 20 is responsible for thermally insulating and storing the high-temperature water heated by the heat pump device 10 to the first temperature. The energy storage device 30 further heats the high-temperature water to a second temperature to generate first steam, which is then transported to the steam use system.

[0084] In a specific implementation, the energy storage device 30 includes at least one energy storage module. Each energy storage module is filled with a heat storage medium (such as molten salt), and a heat exchange pipeline is arranged on the energy storage module. The heat exchange pipeline is used for heat transfer of high-temperature water and can further heat the water to first steam at the second temperature.

[0085] The energy storage device 30 and the water storage device 20 are connected through the main water inlet pipe G1. The main water inlet pipe G1 is used to transport the high-temperature water in the water storage device 20 to the heat exchange pipeline. The main water inlet pipe G1 at least includes a feed water pump group L1 and a main pipe regulating valve group L2. The feed water pump group L1 is based on the basic principle of a centrifugal pump and transports water from a low-pressure area to a high-pressure area through the transfer and conversion of mechanical energy. The main pipe regulating valve group L2 is used to control the total flow rate of the feed water.

[0086] The desuperheater 40 includes a steam inlet and a desuperheating water inlet. The steam inlet is connected to the energy storage device 30 through the first steam pipe G2 and is used to receive the first steam. The desuperheating water inlet is connected to the water storage device 20 through the desuperheating water pipe G4 and is used to receive desuperheating water. The desuperheater 40 mixes the steam input from the steam inlet and the desuperheating water input from the desuperheating water inlet and then outputs second steam at a third temperature, and the third temperature is lower than the second temperature.

[0087] The main purpose of the desuperheater 40 to cool the steam is to reduce the temperature of the superheated steam to a level suitable for industrial applications, so as to meet the requirements of different equipment and processes for steam parameters. By reasonably controlling the steam temperature, the desuperheater 40 can optimize the thermal efficiency of the entire steam system and avoid energy waste caused by excessively high steam temperature. In industrial production, the steam load and the operating conditions of the equipment may change. The desuperheater dynamically controls the steam temperature by adjusting the flow rate and temperature of the desuperheating water to adapt to different operating conditions.

[0088] The desuperheating water branch G4 is led out between the feed pump group L1 and the main pipe regulating valve group L2 in the main water inlet pipe G1 and is connected to the desuperheating water input port of the desuperheater 40. The desuperheating water transported through this branch is mixed with the high-temperature steam in the desuperheater 40 and then output to the second steam pipe G3 on the user side to adjust the steam temperature to the third temperature required by the user. The connection mode of the desuperheating water branch G4 ensures that the inlet pressure of the desuperheating water pipeline is not affected by the action of the main pipe regulating valve L2, and ensures that the steam temperature on the user side does not exceed the limit under any operating conditions.

[0089] The system of this application mainly tracks the steam pressure value and temperature value. When the pressure fluctuates, the main pipe regulating valve group for high-temperature water is controlled to increase or decrease the high-temperature water flow rate to maintain pressure stability. When the temperature fluctuates, the desuperheating water regulating valve for desuperheating water is controlled to increase or decrease the desuperheating water flow rate to maintain temperature stability. During the steam generation process, the main pipe regulating valve group performs PID regulation on the high-temperature water flow rate according to the steam outlet pipe pressure measurement value. The desuperheating water regulating valve performs PID regulation on the desuperheating water flow rate according to the steam outlet pipe temperature measurement value. On the basis of the above embodiments, another embodiment of a steam generation system is disclosed in this application. The energy storage device includes a plurality of energy storage modules.

[0090] The plurality of energy storage modules are connected in parallel to form multiple steam generation paths.

[0091] The water inlets of the plurality of energy storage modules are respectively connected to the main water inlet pipe through a plurality of branch water inlet pipes. A branch pipe regulating valve group and a first electric shut-off valve are arranged on each branch water inlet pipe, and the branch pipe regulating valve group is used to control the same high-temperature water flow rate entering each energy storage module.

[0092] The steam outlets of the plurality of energy storage modules are respectively connected to the first steam pipe through a plurality of branch steam pipes. A first mechanical safety valve is arranged on each branch steam pipe to control the air pressure in the branch steam pipe.

[0093] Specifically, in one implementation mode of this embodiment, in a high steam demand scenario, the energy storage module 30 includes a plurality of energy storage modules. It can be switched to the parallel operation mode, and each module releases heat independently to form multiple steam generation paths to meet the rapid steam supply demand and significantly improve the steam supply response speed.

[0094] The energy storage module is filled with a heat storage medium and equipped with a heat exchange pipeline, and also includes a high-temperature water inlet and a steam outlet. The number of energy storage modules can be arbitrarily paralleled and stacked from 1 to N. If the number is greater than 2, the inlets of multiple energy storage modules are respectively connected to the main inlet pipeline G1 through multiple branch inlet pipelines G11.

[0095] In this embodiment, three parallel molten salt energy storage modules are specifically taken as an example, as shown in the attached drawings of the specification. Figure 2 In order to make the heat storage module release heat evenly, a branch valve group L3 is provided on the branch inlet pipeline G11 in front of each module, and the inlet flow rate is adjusted to be basically the same through the branch valve group L3 in front of each module. A first electric shut-off valve L4 is provided between the branch valve group L3 and the module inlet for shut-off.

[0096] The steam outlets of the multiple energy storage modules 31, 32, and 33 are respectively connected to the first steam pipeline G2 through multiple branch steam pipelines G21. Then, it is connected to the desuperheater 40 through the first steam pipeline G2. A first mechanical safety valve L5 is provided on each branch steam pipeline at the outlet of the molten salt heat storage module. When the first mechanical safety valve L5 is opened, the steam in the branch steam pipeline G21 can be discharged.

[0097] In another embodiment of this embodiment, in a low steam demand scenario, the energy storage device 30 can also be switched to a series operation mode, and the low-temperature molten salt that has released part of the heat is used to preheat other modules to maximize the utilization of the heat storage medium and thus optimize the energy efficiency. In addition, to enhance the operation flexibility, in the series mode, the preheating flow rate between each module can be dynamically adjusted to optimize the heat distribution.

[0098] Another embodiment of the steam generation system provided by this application is based on any one of the above embodiments, and a first pressure monitoring point J1 is provided on the main inlet pipeline.

[0099] A second pressure monitoring point J2 is provided on each of the branch steam pipelines.

[0100] A third pressure monitoring point J3 is provided near the desuperheater on the second steam pipeline.

[0101] A fourth pressure monitoring point J4 is provided near the desuperheater on the desuperheating water pipeline.

[0102] A first temperature monitoring point J5 is also provided on each of the branch steam pipelines.

[0103] A second temperature monitoring point J6 is also provided near the desuperheater on the first steam pipeline and near the desuperheater on the second steam pipeline.

[0104] Specifically, the positions of the pressure monitoring points and the temperature monitoring points refer to the attached drawings of the specification. Figure 2 The system of the present application couples a heat pump device with an energy storage device, and the energy storage device is a parallel pipeline of multiple single-tank molten salt heat storage modules. While improving the system energy efficiency, temperature and pressure monitoring modules and valve component control modules can be set on the main and branch pipelines where the heat pump is connected to the molten salt module, so as to more efficiently and safely achieve pressure early warning and regulation by grading and branching the system. The pressure data monitored by each pressure monitoring point and the temperature data monitored by each temperature monitoring point are both used for the PID control of the main pipe regulating valve group and the desuperheating water regulating valve.

[0105] In an implementation manner of this embodiment, the PID regulation of the steam temperature is specifically as follows: The desuperheating water regulating valve performs PID regulation according to the outlet temperature of the second steam pipeline to maintain the stability of the outlet temperature. The regulation of the steam temperature is completed by the desuperheater. When the temperature measured by the temperature measuring point of the second steam pipeline (main steam pipeline) exceeds the set value, the desuperheating water regulating valve starts to perform PID regulation to maintain the stability of the steam parameters. When the steam temperature exceeds the warning value, the system will shut down safely. When the measured value at the outlet of the second steam pipeline (main steam pipeline) is higher than the steam temperature set value, the opening of the desuperheating water regulating valve is increased, the desuperheating water flow rate increases, and the steam outlet temperature decreases rapidly. When the measured value at the outlet of the second steam pipeline (main steam pipeline) is lower than the steam temperature set value, the opening of the desuperheating water regulating valve is decreased, the desuperheating water flow rate decreases, and the steam outlet temperature increases rapidly.

[0106] In another implementation manner of this embodiment, the PID regulation of the steam pressure is specifically as follows: The system mainly tracks the steam pressure value, and when the pressure fluctuates, the flow rate is increased or decreased through the main pipe regulating valve group (feed water main pipe regulating valve) to maintain the pressure stability. In order to make the heat storage modules release heat evenly, the inlet water flow rate is adjusted to be basically the same through the branch pipe regulating valve group in front of each module.

[0107] During the steam production process, the main pipe regulating valve group (main feed water regulating valve) performs PID regulation on the feed water regulating valve according to the measured value of the steam outlet pipe pressure. When the measured value is greater than the expected steam pressure threshold (for example, 0.62 MPa - 0.68 MPa), that is, greater than the first steam pressure preset value (0.68 MPa), the feed water regulating valve is closed, the steam production volume of the system gradually decreases, and the steam outlet pressure gradually decreases. When the measured value is less than the expected steam pressure threshold (for example, 0.62 MPa - 0.68 MPa), that is, less than the second steam pressure preset value (0.62 MPa), the feed water regulating valve is opened, the steam production volume of the system gradually increases, and the steam outlet pressure gradually increases.

[0108] This embodiment combines system feedwater regulation and recirculation pipeline design for regulation during system operation, more effectively utilizing energy and protecting system safety. Combining regulation with PID regulation, it controls the steam temperature by adjusting the desuperheated water flow and adjusts the steam pressure by regulating the feedwater volume, thereby achieving high system adaptability, safety, and high energy utilization efficiency.

[0109] Another embodiment of a steam generation system is provided in this application. Based on any of the above embodiments of the system, this embodiment of a steam generation system further includes: a pressure stabilizing device 50.

[0110] The steam outlets of the multiple energy storage modules 30 are respectively connected to the pressure stabilizing device 50 through multiple branch steam pipelines G21, enabling the energy storage modules 30 to supply the first steam to the pressure stabilizing device 50.

[0111] The pressure stabilizing device is connected to the steam input port of the desuperheater 40 through the first steam pipeline G2, and is used to input the first steam into the desuperheater 40 after pressure stabilizing treatment.

[0112] Specifically, the pressure stabilizing device 50 is preferably a steam header. The steam outputs of the energy storage modules 30 are collected through the pressure stabilizing device 50, merged into one path, and then enter the desuperheater 40.

[0113] A steam header is an important pressure stabilizing device for a steam system. Its main function is to distribute the steam generated by the energy storage modules 30 to each steam-using equipment, and at the same time play the roles of steam-water separation, pressure regulation, and buffering. Through the functions of steam-water separation and pressure regulation, the steam header reduces the moisture and impurities in the steam, preventing downstream equipment from being damaged due to poor steam quality. At the same time, it can also protect the steam system from the impact of sudden downstream pressure drops.

[0114] One implementation manner of this embodiment is as follows: During off-peak electricity periods, the energy storage device 30 (molten salt storage tank) is electrically heated to 400 °C. When steam needs to be generated, the molten salt storage tank releases heat, heating the high-temperature water to a second temperature of approximately 350 °C, and transporting it to the steam header. The steam output from the steam header enters the desuperheater, and at the same time, the desuperheated water from the insulation water tank also enters the desuperheater, enabling the desuperheater to output steam at a third temperature of 180 °C and 0.68 MPa for user use.

[0115] Another embodiment of a steam generation system is provided in this application. Based on any of the above embodiments of the system, this embodiment of a steam generation system further includes: a recirculation branch G12.

[0116] The recirculation branch is led out between the main pipe regulating valve group and the energy storage module and is connected to the water storage device, and is used to realize the reflux of the high-temperature water during system operation.

[0117] A recirculation valve group L8 is provided on the recirculation branch to control the flow rate of the high-temperature water flowing back.

[0118] Specifically, a recirculation pipeline is provided after the main pipe regulating valve group and returns to the heat preservation water tank. A recirculation pipeline valve is provided on the recirculation pipeline. When the pressure of the backend system rises too fast, the recirculation pipeline can be opened first to bypass part of the feed water into the heat preservation water tank, reducing the water inflow of the backend module, thereby controlling the pressure. It plays an important role in the first-stage pressure warning design.

[0119] Another embodiment of a steam generation system is provided in this application. Based on any one of the above embodiments of the system, a first overpressure relief valve L5 and a second mechanical safety valve L7 are provided on the second steam pipeline G3 to control the air pressure in the second steam pipeline.

[0120] Specifically, this embodiment not only combines regulation with PID regulation, controls the steam temperature by adjusting the flow rate of desuperheating water, and adjusts the steam pressure by adjusting the water supply volume, but also designs a system steam pressure warning. Through a four-stage pressure warning design, the safety and stability of the system operation are significantly improved when the steam pressure fluctuates.

[0121] The first overpressure relief valve L5 and the second mechanical safety valve L7 provided on the second steam pipeline G3, that is, the main steam pipeline. The first overpressure relief valve L5 is used to prevent the system pressure from exceeding the set safety value. When the pressure in the steam pipeline exceeds the set value, the overpressure relief valve will automatically open to release the excess pressure and prevent the pipeline and equipment from being damaged due to overpressure. When the pressure in the pipeline or equipment exceeds the set opening pressure, the second mechanical safety valve L7 will quickly open fully to quickly release a large amount of medium to prevent the pressure from continuing to rise. It plays an important role in the second-stage pressure warning design.

[0122] Another embodiment of a steam generation system is provided in this application. Based on any one of the above embodiments of the system, this embodiment of a steam generation system further includes: a blowdown pipeline G5.

[0123] The blowdown pipeline is connected to the water inlet of the energy storage module and communicates with the blowdown well.

[0124] A blowdown valve group L9 is installed on the blowdown pipeline. The blowdown valve group includes at least a first manual shut-off valve and a second electric shut-off valve.

[0125] When the energy storage module is working, the second electric shut-off valve is closed. When shutting down, the second electric shut-off valve is opened so that the energy storage device can discharge the residual working medium to the blowdown well through the residual pressure.

[0126] Specifically, each molten salt heat storage module water inlet is connected to a sewage pipe G5 at the same time. The sewage pipe G5 is connected to the water supply port of the energy storage module and connected to the sewage well. A sewage valve is installed on the sewage pipe. The sewage valve group L9 includes at least an electric shut-off valve 1 and a manual shut-off valve 1 installed near the water inlet of the sewage pipe G5. The electric shut-off valve is closed during normal operation, and the electric valve is opened during shutdown to press the residual water working fluid of the heat storage module to the sewage well by the residual pressure. When the system enters the shutdown state, the working fluid in the energy storage module can be discharged through the sewage pipe to quickly reduce the pressure. It plays an important role in the design of the third-level pressure warning.

[0127] During the operation of the system, the steam pipeline pressure on each main / branch line is monitored, and the opening adjustment, automatic opening and closing, and manual forced closing of the regulating valve / electronic overpressure relief valve / mechanical safety valve are set to achieve step-by-step early warning and regulation of the system steam pressure.

[0128] Combined with the system in the above embodiment. The present application significantly improves the safety and stability of the system operation through a four-level pressure warning design. When the steam pressure fluctuates, the first warning responds quickly to stabilize the pressure by adjusting the recirculation pipeline. The second warning relieves the pressure by opening the overpressure relief valve after the desuperheater and exhausting steam to the air. During the third warning, the system enters an emergency shutdown state, while controlling the opening of the overpressure relief valve and closing the water feed pump group to quickly reduce the pressure. The fourth warning ensures that the system and equipment are protected from damage in extreme cases through the automatic tripping of the mechanical safety valve. This multi-level pressure warning mechanism is progressive, which not only realizes the precise control of pressure regulation, but also provides multiple safety guarantees for system operation, significantly reduces the risks caused by overpressure, and extends the service life of the equipment.

[0129] Based on the same concept, the present application also discloses a pressure cascade early warning and control method for a steam generation system. The implementation of the method is based on the structure described in any of the above system embodiments. Specifically, the present application discloses an embodiment of a pressure cascade early warning and control method for a steam generation system, refer to the attached specification Figure 3 As shown, specifically including:

[0130] S10, monitoring the steam pipeline pressure on each main / branch line through the pressure monitoring point. Based on the expected steam pressure threshold, the opening of the main pipe regulating valve group is adjusted step by step in combination with the PID control method to adjust the inlet flow of the high-temperature water, thereby adjusting the amount of steam generated and controlling the steam pipeline pressure to be stable.

[0131] S20, monitoring the temperature of the output steam through the temperature monitoring point, and adjusting the opening of the desuperheating water regulating valve step by step based on the expected steam temperature threshold value in combination with the PID control method to adjust the flow of the desuperheating water, thereby controlling the steam temperature to be stable.

[0132] Specifically, in an implementation manner of this embodiment, the PID regulation of the steam temperature is as follows: The desuperheating water regulating valve performs PID regulation according to the temperature at the outlet of the second steam pipeline to maintain the stability of the outlet temperature. The regulation of the steam temperature is completed by the desuperheater. When the temperature measured by the temperature measuring point of the second steam pipeline (main steam pipeline) exceeds the set value, the desuperheating water regulating valve starts to perform PID regulation to maintain the stability of the steam parameters. When the steam temperature exceeds the warning value, the system will shut down safely. When the measured value at the outlet of the second steam pipeline (main steam pipeline) is higher than the steam temperature set value, the opening of the desuperheating water regulating valve is increased, the desuperheating water flow rate increases, and the steam outlet temperature decreases rapidly. When the measured value at the outlet of the second steam pipeline (main steam pipeline) is lower than the steam temperature set value, the opening of the desuperheating water regulating valve is decreased, the desuperheating water flow rate decreases, and the steam outlet temperature increases rapidly.

[0133] In another implementation manner of this embodiment, the PID regulation of the steam pressure is as follows: The system mainly tracks the steam pressure value. When the pressure fluctuates, the flow rate is increased or decreased through the main pipe regulating valve group (feed water main pipe regulating valve) to maintain the pressure stability. In order to make the heat storage modules release heat evenly, the inlet water flow rate is adjusted to be basically the same through the branch pipe regulating valve group in front of each module.

[0134] Based on the above embodiments, another embodiment of a pressure cascade early warning and control method for a steam generation system is disclosed in this application. In step S10, based on the expected steam pressure threshold, the opening degree of the main pipe regulating valve group is gradually regulated in combination with the PID control method.

[0135] Specifically, the system mainly tracks the steam pressure value. When the pressure fluctuates, the high-temperature water flow rate is increased or decreased by controlling the main pipe regulating valve group of the feed water to maintain the pressure stability. In order to make the heat storage modules release heat evenly, the inlet water flow rate is adjusted to be basically the same through the branch pipe regulating valve group in front of each module. During the steam generation process, the main pipe regulating valve group performs PID regulation on the feed water regulating valve according to the measured value of the steam outlet pipeline pressure.

[0136] For example, the expected steam pressure threshold is preset to be 0.62 MPa to 0.68 MPa. Based on the PID control system, when the pressure value measured on the steam outlet pipeline is greater than the expected steam pressure threshold, that is, greater than 0.68 MPa, the main pipe regulating valve group is closed. The water supply to the energy storage module is reduced, the steam generation amount of the system gradually decreases, and the steam outlet pressure gradually decreases. When the pressure value measured on the steam outlet pipeline is less than the expected steam pressure threshold, that is, less than 0.62 MPa, the main pipe regulating valve group is opened, the water supply to the energy storage module is increased, the steam generation amount of the system gradually increases, and the steam outlet pressure gradually increases.

[0137] Preferably, the expected steam pressure threshold is the optimal range for stable steam pressure, and the difference between its upper limit and lower limit is about 0.05 - 0.1 MPa. The specific value of the expected steam pressure threshold is obtained based on the working experience of relevant technicians, and the expected steam pressure thresholds corresponding to systems of different scales are different.

[0138] In another embodiment of this embodiment, step S20, based on the expected steam temperature threshold and in combination with the PID control method, gradually adjusts the opening degree of the desuperheating water regulating valve, and further includes:

[0139] Compare the collected steam temperature with the expected steam temperature threshold.

[0140] Specifically, the desuperheating water regulating valve performs PID regulation according to the steam outlet temperature to maintain the stability of the outlet temperature. The regulation of the steam temperature is completed by the desuperheater. The desuperheater includes a steam input port and a desuperheating water input port. The steam input port is used to receive the first steam at the second temperature, and the desuperheating water input port is connected to the water storage device through a desuperheating water pipeline and is used to receive desuperheating water. The desuperheater mixes the steam input from the steam input port and the desuperheating water input from the desuperheating water input port and then outputs the second steam at the third temperature, and the third temperature is lower than the second temperature. The input amount of desuperheating water affects the value of the third temperature of the generated second steam.

[0141] In this embodiment, by monitoring whether the steam temperature output from the second steam pipeline exceeds the expected steam temperature threshold, if it exceeds, the desuperheating water regulating valve starts to perform PID regulation to maintain the stability of the steam parameters. When the steam temperature exceeds the warning value, the system will shut down safely.

[0142] When the measured value of the steam temperature output from the second steam pipeline is higher than the expected steam temperature threshold of the steam temperature, increase the opening degree of the desuperheating water regulating valve, the desuperheating water flow rate increases, and the steam outlet temperature decreases rapidly.

[0143] When the measured value of the steam temperature output from the second steam pipeline is lower than the expected steam temperature threshold of the steam temperature, decrease the opening degree of the desuperheating water regulating valve, the desuperheating water flow rate decreases, and the steam outlet temperature increases rapidly.

[0144] Similarly, the expected steam temperature threshold is the optimal range for stable steam pressure. The specific value of the expected steam temperature threshold is obtained based on the working experience of relevant technicians, and the expected steam temperature thresholds corresponding to systems of different scales are different.

[0145] Another embodiment of the pressure cascade warning and regulation method for a steam generation system provided by this application, referring to the attached Figure 4 As shown, on the basis of any one of the above embodiments of the method, it further includes:

[0146] S30. Based on the pressure data of the third pressure monitoring point, control the opening degree of the recirculation valve group to carry out first-stage pressure regulation warning.

[0147] Specifically, it includes the following steps:

[0148] Obtain the pressure data of the third pressure monitoring point and judge whether it exceeds the first warning pressure.

[0149] If so, control the recirculation valve group on the recirculation branch to open. Make the high-temperature water flow back into the water storage device. At this time, the main water inlet pipe no longer supplies water to the energy storage device, the energy storage device suspends steam production, and the pressure at the third pressure monitoring point drops.

[0150] Continuously monitor the pressure data of the third pressure monitoring point and judge whether it drops to the first safety pressure.

[0151] If so, control the recirculation valve group to close. At this time, the main water inlet pipe continues to supply water to the energy storage device, and the energy storage device resumes steam production.

[0152] S40. Based on the pressure data of the second pressure monitoring point, control the opening degree of the first overpressure relief valve to carry out second-stage pressure regulation warning.

[0153] Specifically, it includes the following steps:

[0154] Obtain the pressure data of the second pressure monitoring point and judge whether it exceeds the second warning pressure.

[0155] If so, control the first overpressure relief valve on the second steam pipe to open. The steam in the second steam pipe is released to relieve pressure, so that the pressure at the second pressure monitoring point drops.

[0156] Continuously monitor the pressure data of the second pressure monitoring point and judge whether it drops to the second safety pressure.

[0157] If so, control the first overpressure relief valve to close.

[0158] S50. Based on the pressure data of the second pressure monitoring point, close the feed pump group and control the blowdown valve group to open to carry out third-stage pressure regulation warning.

[0159] Specifically, it includes the following steps:

[0160] Obtain the pressure data of the second pressure monitoring point and judge whether it exceeds the third warning pressure.

[0161] If so, control to shut down the feed water pump group and open the blowdown valve group. At this time, the main water inlet pipe no longer supplies water to the energy storage device, the energy storage device pauses steam production, and the pressure at the second pressure monitoring point drops. The blowdown valve group is opened so as to discharge the working medium in the energy storage module through the blowdown pipe to reduce the pressure.

[0162] S60. Based on the pressure data of the third pressure monitoring point, control the opening degree of the mechanical safety valve to perform four - level pressure regulation warning.

[0163] Specifically, it includes the following steps:

[0164] Obtain the pressure data of the third pressure monitoring point and judge whether it exceeds the fourth warning pressure.

[0165] If so, the first mechanical safety valve automatically pops up to release and relieve the pressure of the steam in each branch steam pipe. The second mechanical safety valve automatically pops up to release and relieve the pressure of the steam in the second steam pipe.

[0166] In another implementation manner of this embodiment, the system is provided with four - level pressure protection. During normal operation, as the steam pressure rises and falls, the opening degree of the regulating valve of the feed water header is adjusted accordingly. When the steam pressure exceeds the first warning value, the recirculation pipeline is opened. When the steam pressure exceeds the second warning value, the over - pressure relief valve on the steam pipe after the desuperheater will automatically open and discharge steam to the atmosphere. If the pressure continues to rise to the third warning value, the system will shut down emergently and the blowdown valve will open to discharge all the working medium. When the pressure reaches the fourth warning value, the mechanical safety valve will automatically lift.

[0167] First - level warning: Monitor the pressure of the outlet steam pipe. When it reaches the first pressure (0.69 MPa), open the valve of the recirculation pipeline. At this time, the feed water will return to the water tank through the recirculation pipeline, and the feed water will no longer enter the molten salt storage tank. After the stored water in the storage tank has finished producing steam, it will no longer continue to produce steam. When the pressure measuring point of the outlet steam pipe drops to 0.74 MPa, close the valve of the recirculation pipeline, and the feed water re - enters the molten salt storage tank, and the system resumes steam production.

[0168] Second - level warning: Monitor the pressure on the steam pipes after each molten salt heat storage module. When it reaches the second pressure (0.80 MPa), automatically open the over - pressure relief and discharge valve. When the pressure returns to 0.5 MPa, automatically close the over - pressure relief and discharge valve.

[0169] Third - level warning: Monitor the pressure on the steam pipes after each molten salt heat storage module. When it reaches the third pressure (0.95 MPa), shut down the feed water pump and at the same time automatically open the over - pressure relief and discharge valve. The system enters the emergency shutdown state, and at the same time discharges the working medium in the energy storage module through the blowdown pipe to quickly reduce the pressure.

[0170] Level 4 warning: When the steam pipeline reaches the fourth pressure (1.07Mpa), the mechanical safety valve on the pipeline will trip, releasing the steam in the pipeline to relieve the pressure and ensure the safety of the system.

[0171] Generally, the outlet steam pipeline pressure changes first, and about 1 second later, the pressure on the steam pipelines behind each molten salt heat storage module changes accordingly.

[0172] In this embodiment, the pressure on the steam pipeline after each molten salt heat storage module is set is about 0.05-0.15MPa higher than the outlet steam pipeline pressure. The second pressure is about 0.1-0.2MPa higher than the first pressure. Preferably, the first pressure, the second pressure, the third pressure, and the fourth pressure increase step by step. Through multi-stage adjustment, the pressure can be finely adjusted step by step to ensure that the pressure in the system pipeline is always in the best state, avoiding the instability of the steam system pressure caused by the fluctuation of the steam usage at the user end.

[0173] A steam generation system and a pressure step warning and control method thereof of the present application have the same technical concept, and the technical details of the embodiments of the two are applicable to each other. To reduce repetition, they will not be repeated here.

[0174] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned program modules is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program units or modules to complete all or part of the functions described above. The program modules in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into a processing unit, and the above-mentioned integrated unit can be implemented in the form of hardware or in the form of software program units. In addition, the specific names of the program modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application.

[0175] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

Claims

1. A steam generating system, characterized in that: include: Heat pump devices, water storage devices, energy storage devices and desuperheaters; The heat pump device is used to provide heat to heat water to form high-temperature water at a first temperature; The water storage device is connected to the heat pump device and is used to store the high-temperature water; The energy storage device is connected to the water storage device through a main water inlet pipe, and is used to receive the high-temperature water and further heat the high-temperature water to generate first water vapor at a second temperature; The desuperheater is connected to the energy storage device through a first steam pipeline for receiving the first water vapor; the desuperheater is connected to the water storage device through a desuperheating water pipeline for receiving desuperheating water; the desuperheater generates second water vapor at a third temperature based on the first water vapor and the desuperheating water, and outputs the second water vapor through a second steam pipeline; the third temperature is lower than the second temperature; The main water inlet pipeline is provided with a water supply pump group and a main pipe regulating valve group, and the main pipe regulating valve group is used to perform PID regulation on the flow rate of the high-temperature water according to the pressure data collected by the pressure monitoring point arranged in the system pipeline, so as to maintain the stable pressure of the steam pipeline; The desuperheating water pipeline is provided with a desuperheating water regulating valve, which is used to perform PID regulation on the flow rate of the desuperheating water according to the temperature data collected by the temperature monitoring point arranged in the system pipeline, so as to maintain the stable steam temperature.

2. A steam generating system according to claim 1, characterized in that: The energy storage device comprises a plurality of energy storage modules; The plurality of energy storage modules are connected in parallel to form a plurality of steam generation paths; The water inlets of the multiple energy storage modules are connected to the main water inlet pipe through multiple branch water inlet pipes respectively; each of the branch water inlet pipes is provided with a branch pipe regulating valve group and a first electric shut-off valve, and the branch pipe regulating valve group is used to control the high-temperature water flow entering each of the energy storage modules to be consistent; The steam outlets of the multiple energy storage modules are connected to the first steam pipeline through multiple branch steam pipelines respectively; each branch steam pipeline is provided with a first mechanical safety valve for controlling the air pressure in the branch steam pipeline.

3. A steam generating system according to claim 2, characterized in that: A first pressure monitoring point is provided on the main water inlet pipe; A second pressure monitoring point is provided on each of the branch steam pipelines; A third pressure monitoring point is provided on the second steam pipeline near the desuperheater; A fourth pressure monitoring point is arranged on the desuperheating water pipeline close to the desuperheater; Each of the branch steam pipelines is also provided with a first temperature monitoring point; A second temperature monitoring point is also provided at a location of the first steam pipe close to the desuperheater and at a location of the second steam pipe close to the desuperheater.

4. A steam generating system according to claim 3, characterized in that: The second steam pipeline is provided with a first overpressure relief valve and a second mechanical safety valve for controlling the air pressure in the second steam pipeline.

5. A steam generating system according to claim 4, characterized in that: Also included: a voltage stabilizing device; The steam outlets of the plurality of energy storage modules are respectively connected to the pressure stabilizing device through a plurality of branch steam pipelines, so that the energy storage modules supply the first water vapor to the pressure stabilizing device; The pressure stabilizing device is connected to the steam input port of the desuperheater through the first steam pipeline, and is used to input the first water vapor into the desuperheater after pressure stabilization.

6. A steam generating system according to claim 5, characterized in that: Also includes: Recirculation branch; The recirculation branch is led out from between the main pipe regulating valve group and the energy storage module and connected to the water storage device, so as to realize the reflux of the high-temperature water when the system is running; The recirculation branch is provided with a recirculation valve group for controlling the flow rate of the refluxed high-temperature water.

7. A steam generating system according to claim 6, characterized in that: Also includes: Sewage pipes; The sewage pipe is connected to the water inlet of the energy storage module and communicated with the sewage well; A sewage valve group is installed on the sewage pipe; the sewage valve group includes at least a first manual shut-off valve and a second electric shut-off valve; The second electric shut-off valve is closed when the energy storage module is working; the second electric shut-off valve is opened when the energy storage module is shut down, so that the energy storage device can discharge the residual working fluid to the sewage well through the residual pressure.

8. A pressure cascade early warning and control method for a steam generation system, characterized in that: The implementation of the method is based on a steam generation system as described in claim 7, and specifically comprises the following steps: The steam pipeline pressure on each main / branch line is monitored through the pressure monitoring point; based on the expected steam pressure threshold, the opening of the main pipe regulating valve group is adjusted step by step in combination with the PID control method; so as to adjust the water inlet flow of the high-temperature water, thereby adjusting the amount of steam generated and controlling the stability of the steam pipeline pressure; The temperature of the output steam is monitored through the temperature monitoring point, and based on the expected steam temperature threshold, the opening of the cooling water regulating valve is regulated step by step in combination with the PID control method; so as to adjust the flow rate of the cooling water, thereby controlling the steam temperature to be stable.

9. A pressure step warning and control method for a steam generation system according to claim 8, characterized in that: Also includes: Based on the pressure data of the third pressure monitoring point, controlling the opening of the recirculation valve group to perform a first-level pressure regulation early warning; The specific steps include: Obtaining pressure data of the third pressure monitoring point to determine whether the pressure data exceeds the first warning pressure; If yes, the recirculation valve group on the recirculation branch is controlled to open; so that the high-temperature water flows back into the water storage device, at which time the main water inlet pipe no longer supplies water to the energy storage device, the energy storage device stops producing steam, and the pressure at the third pressure monitoring point drops; Continuously monitoring the pressure data of the third pressure monitoring point to determine whether it drops to a first safety pressure; If so, the recirculation valve group is controlled to close; at this time, the main water inlet pipeline continues to supply water to the energy storage device, and the energy storage device resumes steam production.

10. A pressure step early warning and control method for a steam generation system according to claim 9, characterized in that: Also includes: Based on the pressure data of the second pressure monitoring point, controlling the opening of the first overpressure relief valve to perform a secondary pressure regulation early warning; The specific steps include: Obtaining pressure data of the second pressure monitoring point to determine whether the pressure data exceeds a second warning pressure; If yes, the first overpressure relief valve on the second steam pipeline is controlled to open; the steam in the second steam pipeline is released and the pressure is relieved, so that the pressure at the second pressure monitoring point drops; Continuously monitoring the pressure data of the second pressure monitoring point to determine whether the pressure data drops to a second safety pressure; If yes, the first overpressure relief valve is controlled to close.

11. A pressure cascade early warning and control method for a steam generation system according to claim 10, characterized in that: Also includes: Based on the pressure data of the second pressure monitoring point, the water supply pump group is turned off and the sewage valve group is controlled to open to perform a three-level pressure regulation early warning; The specific steps include: Obtaining pressure data of the second pressure monitoring point to determine whether the pressure data exceeds a third warning pressure; If so, the water supply pump group is controlled to be closed and the drain valve group is opened; at this time, the main water inlet pipe no longer supplies water to the energy storage device, the energy storage device stops producing steam, the pressure at the second pressure monitoring point drops, and the drain valve group is opened to discharge the working fluid in the energy storage module through the drain pipe to reduce the pressure.

12. A pressure step early warning and control method for a steam generation system according to claim 11, characterized in that: Also includes: Based on the pressure data of the third pressure monitoring point, controlling the opening of the mechanical safety valve to perform a four-level pressure regulation early warning; The specific steps include: Obtaining pressure data of the third pressure monitoring point to determine whether it exceeds a fourth warning pressure; If so, the first mechanical safety valve automatically pops up to release the pressure of the steam in each branch steam pipe; the second mechanical safety valve automatically pops up to release the pressure of the steam in the second steam pipe.

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