A superheated steam desuperheating and depressurization system for maintaining thermal standby equipment

Abstract

This invention pertains to a thermal standby device for a superheated steam desuperheating and depressurization system, within the technical field of superheated steam desuperheating and depressurization systems. The equipment pipeline (23) is sequentially configured from one end connected to the high-pressure main steam input pipeline (24) to the other end of the heating pipe, including a high-pressure steam inlet isolation electric valve, a high-pressure steam depressurization regulating valve (3), a high-temperature high-pressure desuperheating and depressurization device (6), a medium-pressure steam depressurization regulating valve (8), a medium-temperature medium-pressure desuperheating and depressurization device (10), a heating pipe isolation electric valve, and the heating pipe itself. The thermal standby device for a superheated steam desuperheating and depressurization system described in this invention has a simple structure, ensures it remains in thermal standby mode, reduces the time required for emergency deployment, and minimizes energy loss while maintaining thermal standby, thus meeting heating demands.

Description

Technical Field

[0001] This invention belongs to the technical field of superheated steam desuperheating and depressurization systems, and more specifically, relates to a heat standby device for superheated steam desuperheating and depressurization systems. Background Technology

[0002] Some enterprises requiring steam heating need to configure desuperheating and pressure reduction devices to reduce the temperature and pressure of high-temperature, high-pressure steam to a suitable level due to specific temperature and pressure requirements. Even when some enterprises have qualified steam for heating, they still need to establish a superheated steam desuperheating and pressure reduction system (desuperheating and pressure reduction station) as a backup steam source to ensure reliable heating. As a backup steam source, if one of the normal steam sources fails, the desuperheating and pressure reduction station needs to be activated, but the pipeline infrastructure requires warming up before it can be put into use, which takes several hours. If the backup steam source is in a warm-up standby state, the timely steam demand of the production system can be met more quickly, reducing the impact on production and safety.

[0003] The prior art includes a technology entitled "A Superheated Steam Cooling and Pressure Reduction System and Method" with publication number "CN110553147A". This technology relates to a superheated steam cooling and pressure reduction system and method. The system includes a superheated steam conveying pipeline, a venturi tube, a softened water conveying pipeline, and a gas-liquid separator. The venturi tube is provided with a constriction inlet end, a throat section, and an outlet end connected in sequence. The superheated steam conveying pipeline is connected to the constriction inlet end of the venturi tube, the softened water conveying pipeline is connected to the throat section, and the gas-liquid separator is connected to the outlet end. The softened water is drawn in and mixed by the negative pressure generated by the venturi tube, thereby achieving the purpose of superheated steam cooling. This avoids the need to install a high-pressure water pump, and is easy to operate and control.

[0004] However, this technology does not address the technical issues and solutions of this application. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a superheated steam desuperheating and depressurization system that maintains hot standby status, reduces the time required for emergency use, minimizes energy loss while maintaining hot standby status, and meets heating demand, in order to address the shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] This invention relates to a superheated steam desuperheating and pressure reducing system for maintaining thermal standby equipment, comprising equipment pipelines. One end of the equipment pipeline is connected to a high-pressure main steam input pipeline, and the other end is a heating pipe. From the end connected to the high-pressure main steam input pipeline to the end connected to the heating pipe, the equipment pipeline is sequentially equipped with a high-pressure steam inlet isolation electric valve, a high-pressure steam pressure reducing regulating valve, a high-temperature and high-pressure desuperheating and pressure reducing device, a medium-pressure steam pressure reducing regulating valve, a medium-temperature and medium-pressure desuperheating and pressure reducing device, a heating pipe isolation electric valve, and a heating pipe. The equipment pipelines before and after the high-pressure steam inlet isolation electric valve are connected to a bypass valve of the high-pressure steam inlet isolation electric valve. A high-temperature and high-pressure desuperheating and pressure reducing device front drain valve is installed on the equipment pipeline before the high-temperature and high-pressure desuperheating and pressure reducing device, and a high-temperature and high-pressure desuperheating and pressure reducing device rear drain valve is installed on the equipment pipeline 23 after the high-temperature and high-pressure desuperheating and pressure reducing device. The equipment pipelines before and after the heating pipe isolation electric valve are connected to a bypass valve of the heating pipe isolation electric valve.

[0008] The high-pressure steam inlet isolation electric gate includes a high-pressure steam inlet isolation electric gate I and a high-pressure steam inlet isolation electric gate II. The equipment pipelines before and after the high-pressure steam inlet isolation electric gate I are connected to the high-pressure steam inlet isolation electric gate bypass valve I, and the equipment pipelines before and after the high-pressure steam inlet isolation electric gate II are connected to the high-pressure steam inlet isolation electric gate bypass valve II.

[0009] The heating pipes include heating pipe I and heating pipe II. The equipment pipelines before and after heating pipe I are connected to heating pipe isolation electric gate bypass valve I, and the equipment pipelines before and after heating pipe II are connected to heating pipe isolation electric gate bypass valve II.

[0010] The heating pipe isolation electric gate includes heating pipe isolation electric gate I and heating pipe isolation electric gate II. Heating pipe isolation electric gate I is connected to heating pipe I, and heating pipe isolation electric gate II is connected to heating pipe II.

[0011] A drain valve is installed on the equipment pipeline at the front end of the medium-temperature and medium-pressure desuperheating and pressure reducing device, and a drain valve is installed on the equipment pipeline at the rear end of the medium-temperature and medium-pressure desuperheating and pressure reducing device.

[0012] A drain valve is installed after the high-pressure steam inlet isolation electric valve I on the equipment pipeline between the high-pressure steam inlet isolation electric valve I and the high-pressure steam inlet isolation electric valve II. A drain valve is installed after the high-pressure steam inlet isolation electric valve II on the equipment pipeline between the high-pressure steam inlet isolation electric valve II and the drain valve before the high-temperature and high-pressure desuperheater.

[0013] The high-temperature and high-pressure desuperheating and pressure reducing device is connected to a high-pressure desuperheating water pipeline, and a high-pressure desuperheating water regulating valve and a high-pressure steam safety valve are installed on the high-pressure desuperheating water pipeline.

[0014] The medium-temperature and medium-pressure desuperheating and pressure reducing device is connected to the medium-pressure desuperheating water pipeline, and the medium-pressure desuperheating water pipeline is equipped with a medium-pressure desuperheating water regulating valve and a medium-pressure steam safety valve.

[0015] The high-pressure desuperheating water pipeline is connected to the main water supply pipeline, and the medium-pressure desuperheating water pipeline is also connected to the main water supply pipeline.

[0016] The working principle and beneficial effects of the technical solution adopted in this invention are as follows:

[0017] The superheated steam desuperheating and pressure reducing system of this invention maintains thermal standby equipment. In its structural design, the equipment pipeline is a gas delivery pipeline, and metal fittings are used to ensure pressure resistance. The equipment pipeline is connected to the high-pressure main steam input pipeline, and the input gas is high-pressure main steam. The high-pressure main steam passes through the equipment pipeline and is processed by multiple components on the pipeline. Finally, the gas is output from the heating pipe. The specific working principle and process are as follows: High-temperature and high-pressure main steam is introduced into the equipment pipeline from the high-pressure main steam input pipeline. After being regulated by the high-pressure steam pressure reducing valve, it enters the high-temperature and high-pressure desuperheating and pressure reducing device. The steam pressure is regulated by the high-temperature and high-pressure pressure reducing device, and the steam temperature is regulated by adjusting the amount of water used for high-pressure desuperheating. The steam after passing through the high-temperature and high-pressure desuperheating and pressure reducing device is medium-temperature and medium-pressure steam. After being regulated by the medium-pressure steam pressure reducing valve, the steam enters the medium-temperature and medium-pressure desuperheating and pressure reducing device. The steam pressure is regulated by the medium-temperature and medium-pressure desuperheating and pressure reducing device, and the steam temperature is regulated by adjusting the water flow during medium-pressure desuperheating. The steam exiting the medium-temperature and medium-pressure desuperheating and pressure reducing device meets the pressure and temperature requirements and is supplied to the pipeline network via the heating pipes. High-pressure steam inlet is controlled by a high-pressure steam inlet isolation electric valve, and steam in the heating pipes is controlled by a heating pipe isolation electric valve. Drain valves before and after the high-temperature and high-pressure desuperheating and pressure reducing device are used to automatically discharge condensate from corresponding locations in the equipment pipelines and prevent steam leakage. Multiple heating pipes (for external network heating pipes) can be configured during equipment setup. When the superheated steam desuperheating and pressure reducing system is in standby mode, the drain valves along the route are opened first, followed by the high-pressure steam isolation electric valve bypass valve for pipe warm-up. The warm-up rate is controlled under conditions that conform to a temperature rise curve less than the pipe material's temperature rise requirement. After the heating pipes reach the required temperature, close the drain valves along the route, open the electric isolation valve, and gradually adjust to the appropriate temperature and pressure. This puts the superheated steam desuperheating and pressure reduction system into hot standby mode. Maintaining the superheated steam desuperheating and pressure reduction system in hot standby mode means ensuring a constant flow of steam to keep the pipe wall temperature at or near the heating operating temperature. Specifically, heating steam from the external network of the desuperheating and pressure reduction station is introduced through the bypass valve of the electric isolation valve. Drain valves along the route are closed, leaving only the drain valve behind the high-pressure steam inlet isolation valve open. The opening of the bypass valve of the electric isolation valve is adjusted to maintain a certain steam flow to maintain the required pipe wall temperature. This effectively meets the actual demand. Attached Figure Description

[0018] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein:

[0019] Figure 1 This is a schematic diagram of the structure of the superheated steam desuperheating and depressurization system for maintaining thermal standby equipment according to the present invention;

[0020] 1. High-pressure steam inlet isolation electric valve I; 2. High-pressure steam inlet isolation electric valve II; 3. High-pressure steam pressure reducing regulating valve; 4. High-pressure desuperheating water regulating valve; 5. High-pressure steam safety valve; 6. High-temperature and high-pressure desuperheating and pressure reducing device; 7. Medium-pressure desuperheating water regulating valve; 8. Medium-pressure steam pressure reducing regulating valve; 9. Medium-pressure steam safety valve; 10. Medium-temperature and medium-pressure desuperheating and pressure reducing device; 11. Heating pipe isolation electric valve I; 12. Heating pipe isolation electric valve II; 13. High-pressure steam inlet isolation electric valve 1 bypass valve; 14. High-pressure steam inlet isolation electric valve I rear drain valve; 15. High-pressure steam inlet isolation electric valve 2 bypass valve; 16. High-pressure steam inlet isolation electric valve II rear drain valve; 17. High-temperature and high-pressure desuperheating and pressure reducing device front drain valve; 18. High-temperature and high-pressure desuperheating and pressure reducing device rear drain valve; 19. Steam trap before medium-temperature and medium-pressure desuperheating and pressure reducing device; 20. Steam trap after medium-temperature and medium-pressure desuperheating and pressure reducing device; 21. Bypass valve I of the heating pipe isolation electric valve; 22. Bypass valve II of the heating pipe isolation electric valve; 23. Equipment piping; 24. High-pressure main steam input pipeline; 25. Heating pipe I; 26. Heating pipe II; 27. High-pressure desuperheating water pipeline; 28. Medium-pressure desuperheating water pipeline; 29. ​​Main feedwater pipeline. Detailed Implementation

[0021] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of the present invention, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part:

[0022] As attached Figure 1As shown, the present invention is a heat standby device for a superheated steam desuperheating and depressurization system, including a device pipeline 23. One end of the device pipeline 23 is connected to a high-pressure main steam input pipeline 24, and the other end of the device pipeline 23 is a heating pipe. From the end connected to the high-pressure main steam input pipeline 24 to the end of the heating pipe, the device pipeline 23 is sequentially equipped with a high-pressure steam inlet isolation electric valve, a high-pressure steam depressurization regulating valve 3, a high-temperature and high-pressure desuperheating and depressurizing device 6, a medium-pressure steam depressurization regulating valve 8, a medium-temperature and medium-pressure desuperheating and depressurizing device 10, a heating pipe isolation electric valve, and a heating pipe. The device pipeline 23 before and after the high-pressure steam inlet isolation electric valve is connected to a high-pressure steam inlet isolation electric valve bypass valve. A high-temperature and high-pressure desuperheating and depressurizing device 6 front drain valve 17 is installed on the device pipeline 23 before the high-temperature and high-pressure desuperheating and depressurizing device 6, and a high-temperature and high-pressure desuperheating and depressurizing device 6 rear drain valve 18 is installed on the device pipeline 23 after the high-temperature and high-pressure desuperheating and depressurizing device 6. The device pipeline 23 before and after the heating pipe isolation electric valve is connected to a heating pipe isolation electric valve bypass valve. The above structure addresses the shortcomings of existing technologies by proposing an improved technical solution. In the structural design, equipment pipeline 23 is a gas transport pipeline, and metal fittings are used to ensure pressure resistance. Equipment pipeline 23 connects to the high-pressure main steam input pipeline 24, and the input gas is high-pressure main steam. The high-pressure main steam passes through the equipment pipeline and is processed by multiple components on the pipeline. Finally, the gas is output from the heating pipe. The specific working principle and process are as follows: High-temperature and high-pressure main steam is introduced into equipment pipeline 23 from the high-pressure main steam input pipeline 24. After being regulated by the high-pressure steam pressure reducing valve 3, it enters the high-temperature and high-pressure desuperheating and pressure reducing device 6. The steam pressure is regulated by the high-temperature and high-pressure pressure reducing device 6, and the steam temperature is regulated by adjusting the amount of water used for high-pressure desuperheating. The steam after passing through the high-temperature and high-pressure desuperheating and pressure reducing device 6 is medium-temperature and medium-pressure steam. After being regulated by the medium-pressure steam pressure reducing valve, the steam enters the medium-temperature and medium-pressure desuperheating and pressure reducing device 10. The steam pressure is regulated by the medium-temperature and medium-pressure desuperheating and pressure reducing device 10, and the steam temperature is regulated by adjusting the water flow rate of the medium-pressure desuperheating device. The steam exiting the medium-temperature and medium-pressure desuperheating and pressure reducing device 10 is the steam that meets the pressure and temperature requirements. The steam is supplied to the pipeline network through the heating pipe. The high-pressure steam inlet is controlled by the high-pressure steam inlet isolation electric valve, and the steam in the heating pipe is controlled by the heating pipe isolation electric valve. The steam trap 17 before the high-temperature and high-pressure desuperheating and pressure reducing device and the steam trap 18 after the high-temperature and high-pressure desuperheating and pressure reducing device are used to automatically discharge condensate at the corresponding positions in the equipment pipeline and prevent steam leakage. When setting up the equipment, multiple heating pipes (external network heating pipes) can be set up. When the superheated steam desuperheating and pressure reducing system is in hot standby mode, the steam traps along the way are opened first, and then the bypass valve of the high-pressure steam isolation electric valve is opened to warm up the pipes. The warm-up rate is controlled under the condition that it meets the temperature rise curve requirements of the pipe material. After the warm-up pipes meet the requirements, close the drain valves along the way, open the electric isolation door, and gradually adjust to the appropriate temperature and pressure to put the superheated steam desuperheating and pressure reduction system into operation as a standby hot equipment.The superheated steam desuperheating and pressure reduction system maintains the equipment in a hot standby state, meaning that steam is always flowing through the equipment pipelines to maintain the pipe wall temperature at or near the heating state. Specifically, heating steam from the external network of the desuperheating and pressure reduction station is introduced through the bypass valve of the heating electric isolation gate. Drains along the route are closed, leaving only the drain valve after the high-pressure steam inlet isolation electric gate open. The opening of the bypass valve of the heating electric isolation gate is adjusted to maintain a certain amount of steam to maintain the required pipe wall temperature. In other words, when maintaining heat, the bypass valve is open and the electric gate is closed; during normal heating, the electric gate is open and the bypass valve is closed. The superheated steam desuperheating and pressure reduction system described in this invention maintains the equipment in a hot standby state. This reduces the time required for emergency deployment and minimizes energy loss while maintaining hot standby, thus meeting heating demands.

[0023] The high-pressure steam inlet isolation electric valve includes high-pressure steam inlet isolation electric valve I1 and high-pressure steam inlet isolation electric valve II2. The equipment pipelines 23 before and after high-pressure steam inlet isolation electric valve I1 are connected to high-pressure steam inlet isolation electric valve bypass valve I13, and the equipment pipelines 23 before and after high-pressure steam inlet isolation electric valve II2 are connected to high-pressure steam inlet isolation electric valve bypass valve II15. In this structure, high-pressure steam inlet isolation electric valves I1 and II2 are both installed on the equipment pipelines 23, and high-pressure steam inlet isolation electric valves I13 and II15 are also connected to corresponding positions on the equipment pipelines. The entire device functions as a unified system.

[0024] The heating pipes include heating pipe I 25 and heating pipe II 26. Equipment pipes 23 before and after heating pipe I 25 are connected to heating pipe isolation electric bypass valve I 21, and equipment pipes 23 before and after heating pipe II 26 are connected to heating pipe isolation electric bypass valve II 22. In this structure, each heating pipe is a branch pipe independently connected to the equipment pipes. The number of heating pipes can be increased according to the actual needs of different applications.

[0025] The aforementioned heating pipe isolation electric gate includes heating pipe isolation electric gate I11 and heating pipe isolation electric gate II12. Heating pipe isolation electric gate I11 is connected to heating pipe I25, and heating pipe isolation electric gate II12 is connected to heating pipe II26. In this structure, each heating pipe is connected to a corresponding heating pipe isolation electric gate to realize the on / off control of the equipment pipeline.

[0026] A pre-condensate drain valve 19 is installed on the equipment pipeline 23 at the front end of the medium-temperature and medium-pressure desuperheating and pressure reducing device 10, and a post-condensate drain valve 20 is installed on the equipment pipeline 23 at the rear end of the device 10. In this structure, the drain valves at different locations are used to automatically discharge condensate from the corresponding locations in the equipment pipeline and prevent steam leakage.

[0027] A high-pressure steam inlet isolation electric valve bypass valve I 13 and high-pressure steam inlet isolation electric valve II 15 are connected to a drain valve 14 after high-pressure steam inlet isolation electric valve I on the equipment pipeline 23. A high-pressure steam inlet isolation electric valve II 15 and a drain valve 17 before the high-temperature and high-pressure desuperheater and pressure reducer are connected to a drain valve 16 after high-pressure steam inlet isolation electric valve II on the equipment pipeline 23. In this structure, the equipment pipeline is equipped with multiple drain valves, which are used to discharge condensate from corresponding locations in the equipment pipeline and prevent steam leakage.

[0028] The high-temperature, high-pressure desuperheating and pressure-reducing device 6 is connected to the high-pressure desuperheating water pipeline 27, which is equipped with a high-pressure desuperheating water regulating valve 4 and a high-pressure steam safety valve 5. The medium-temperature, medium-pressure desuperheating and pressure-reducing device 10 is connected to the medium-pressure desuperheating water pipeline 28, which is equipped with a medium-pressure desuperheating water regulating valve 7 and a medium-pressure steam safety valve 9. The high-pressure desuperheating water pipeline 27 is connected to the main water supply pipeline 29, and the medium-pressure desuperheating water pipeline 28 is also connected to the main water supply pipeline 29.

[0029] The functions of each component of the superheated steam desuperheating and depressurization system maintaining thermal standby equipment described in this invention are as follows:

[0030] High-pressure steam inlet isolation electric valve I: The first high-pressure isolation valve between high-pressure steam and medium- and low-pressure steam pipelines.

[0031] High-pressure steam inlet isolation electric valve I bypass valve: The bypass valve group of the isolation valve consists of primary and secondary valves.

[0032] High-pressure steam inlet isolation electric valve I followed by a drain valve: The drain valve group after the isolation valve consists of primary and secondary valves.

[0033] High-pressure steam inlet isolation electric valve II: The second high-pressure isolation valve between the high-pressure steam and medium- and low-pressure steam pipelines.

[0034] High-pressure steam inlet isolation electric valve II bypass valve: The bypass valve group of the isolation valve consists of primary and secondary valves.

[0035] High-pressure steam inlet isolation electric valve II drain valve: The drain valve group after the isolation valve consists of primary and secondary valves.

[0036] High-pressure steam pressure reducing regulating valve: Regulates the steam pressure entering the desuperheater and pressure reducer.

[0037] High-temperature and high-pressure desuperheating and pressure reducing device: By adjusting the pressure of the desuperheating device and the amount of desuperheating water, the high-temperature and high-pressure steam is desuperheated and depressurized to a suitable temperature and pressure.

[0038] High-temperature and high-pressure desuperheating and pressure reducing device front drain valve assembly: The front drain valve assembly of the desuperheating and pressure reducing device consists of primary and secondary drain valves.

[0039] High-temperature and high-pressure desuperheating and pressure reducing device downstream steam trap: The downstream steam trap assembly of the desuperheating and pressure reducing device consists of primary and secondary steam traps.

[0040] High-pressure desuperheating water regulating valve: regulates the amount of water supplied by high-pressure water as desuperheating water to reduce the temperature of high-temperature and high-pressure steam.

[0041] High-pressure steam safety valve: an overpressure protection valve to prevent overpressure.

[0042] Medium-pressure steam pressure reducing regulating valve: Regulates the steam pressure entering the desuperheater and pressure reducer.

[0043] Medium-temperature and medium-pressure desuperheating and pressure reducing device: By adjusting the pressure of the desuperheating device and the amount of desuperheating water, the temperature and pressure of the steam are further reduced to a suitable temperature and pressure.

[0044] Medium-temperature and medium-pressure desuperheating and pressure reducing device front drain valve assembly: The front drain valve assembly of the desuperheating and pressure reducing device consists of primary and secondary drain valves.

[0045] Medium-temperature and medium-pressure desuperheating and pressure reducing device downstream steam trap assembly: The downstream steam trap assembly consists of primary and secondary steam traps.

[0046] Medium-pressure desuperheating water regulating valve: It regulates the amount of water supplied by high-pressure feed water as desuperheating water, thereby reducing the temperature of the steam.

[0047] Medium-pressure steam safety valve: an overpressure protection and release valve to prevent overpressure.

[0048] Electric isolation valve I for heating pipes: A valve that isolates steam that meets the requirements after de-temperature and pressure reduction from entering the first heating pipeline.

[0049] Bypass valve I for heating pipe isolation electric gate: The bypass valve group for heating isolation valve consists of primary and secondary valves.

[0050] Electric isolation valve II for heating pipes: A valve that isolates steam that meets the requirements after de-temperature and pressure reduction from flowing to the second heating pipeline.

[0051] Bypass valve II for heating pipe isolation electric gate: The bypass valve group for heating isolation valve consists of primary and secondary valves.

[0052] The superheated steam desuperheating and pressure reducing system of this invention maintains a thermal standby device. In its structural design, equipment pipeline 23 is a gas delivery pipeline. Equipment pipeline 23 is connected to the high-pressure main steam input pipeline 24, and the input gas is high-pressure main steam. The high-pressure main steam passes through the equipment pipeline and is processed by multiple components along the pipeline. Finally, the gas is output from the heating pipe. The specific working principle and process are as follows: High-temperature, high-pressure main steam is introduced into equipment pipeline 23 from the high-pressure main steam input pipeline 24. After being regulated by the high-pressure steam pressure reducing regulating valve 3, it enters the high-temperature, high-pressure desuperheating and pressure reducing device 6. The steam pressure is regulated by the high-temperature, high-pressure pressure reducing device 6, and the steam temperature is regulated by adjusting the amount of water used for high-pressure desuperheating. The steam after passing through the high-temperature, high-pressure desuperheating and pressure reducing device 6 is medium-temperature, medium-pressure steam. After being regulated by the medium-pressure steam pressure reducing valve, the steam enters the medium-temperature and medium-pressure desuperheating and pressure reducing device 10. The steam pressure is regulated by the medium-temperature and medium-pressure desuperheating and pressure reducing device 10, and the steam temperature is regulated by adjusting the water flow rate of the medium-pressure desuperheating device. The steam exiting the medium-temperature and medium-pressure desuperheating and pressure reducing device 10 is the steam that meets the pressure and temperature requirements. The steam is supplied to the pipeline network through the heating pipe. The high-pressure steam inlet is controlled by the high-pressure steam inlet isolation electric valve, and the steam in the heating pipe is controlled by the heating pipe isolation electric valve. The steam trap 17 before the high-temperature and high-pressure desuperheating and pressure reducing device and the steam trap 18 after the high-temperature and high-pressure desuperheating and pressure reducing device are used to automatically discharge condensate at the corresponding positions in the equipment pipeline and prevent steam leakage. When setting up the equipment, multiple heating pipes (external network heating pipes) can be set up. When the superheated steam desuperheating and pressure reducing system is in hot standby mode, the steam traps along the way are opened first, and then the bypass valve of the high-pressure steam isolation electric valve is opened to warm up the pipes. The warm-up rate is controlled under the condition that it meets the temperature rise curve requirements of the pipe material. After the warm-up pipes meet the requirements, close the drain valves along the route, open the electric isolation valve, and gradually adjust to the appropriate temperature and pressure. This puts the superheated steam desuperheating and pressure reduction system into operation as a hot standby device. Maintaining the superheated steam desuperheating and pressure reduction system in a hot standby state means that steam is always flowing through the system, keeping the pipe wall temperature at or near the heating temperature. Specifically, heating steam from the external network of the desuperheating and pressure reduction station is introduced through the bypass valve of the heating electric isolation valve. Drain valves along the route are closed, leaving only the high-pressure steam inlet valve open. The opening of the bypass valve of the heating electric isolation valve is adjusted to maintain a certain amount of steam to maintain the required pipe wall temperature, effectively meeting actual needs.

[0053] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A thermal standby device for a superheated steam desuperheating and depressurization system, characterized in that: The equipment includes a pipeline (23), one end of which is connected to the high-pressure main steam input pipeline (24), and the other end of which is a heating pipe. The equipment pipeline (23) is connected to the high-pressure main steam input pipeline (24) and the heating pipe in sequence. The equipment pipeline (23) is equipped with a high-pressure steam inlet isolation electric valve, a high-pressure steam pressure reducing regulating valve (3), a high-temperature and high-pressure desuperheating and pressure reducing device (6), a medium-pressure steam pressure reducing regulating valve (8), a medium-temperature and medium-pressure desuperheating and pressure reducing device (10), a heating pipe isolation electric valve, and a heating pipe. The equipment pipeline (23) before and after the high-pressure steam inlet isolation electric valve is connected to the high-pressure steam inlet isolation electric valve bypass valve. A high-temperature and high-pressure desuperheating and pressure reducing device (6) front drain valve (17) is installed on the equipment pipeline (23) before the high-temperature and high-pressure desuperheating and pressure reducing device (6). A high-temperature and high-pressure desuperheating and pressure reducing device (6) rear drain valve (18) is installed on the equipment pipeline (23) after the high-temperature and high-pressure desuperheating and pressure reducing device (6). The equipment pipeline (23) before and after the heating pipe isolation electric valve is connected to the heating pipe isolation electric valve bypass valve.

2. The superheated steam desuperheating and depressurization system for maintaining thermal standby equipment according to claim 1, characterized in that: The high-pressure steam inlet isolation electric gate includes a high-pressure steam inlet isolation electric gate I (1) and a high-pressure steam inlet isolation electric gate II (2). The equipment pipelines (23) before and after the high-pressure steam inlet isolation electric gate I (1) are connected to the high-pressure steam inlet isolation electric gate bypass valve I (13), and the equipment pipelines (23) before and after the high-pressure steam inlet isolation electric gate II (2) are connected to the high-pressure steam inlet isolation electric gate bypass valve II (15).

3. The superheated steam desuperheating and depressurization system for maintaining thermal standby equipment according to claim 2, characterized in that: The heating pipes include heating pipe I (25) and heating pipe II (26). The equipment pipelines (23) before and after heating pipe I (25) are connected to the bypass valve I (21) of the heating pipe isolation electric gate, and the equipment pipelines (23) before and after heating pipe II (26) are connected to the bypass valve II (22) of the heating pipe isolation electric gate.

4. The superheated steam desuperheating and depressurization system for maintaining thermal standby equipment according to claim 3, characterized in that: The heating pipe isolation electric gate includes heating pipe isolation electric gate I (11) and heating pipe isolation electric gate II (12). Heating pipe isolation electric gate I (11) is connected to heating pipe I (25), and heating pipe isolation electric gate II (12) is connected to heating pipe II (26).

5. The thermal standby equipment of the superheated steam desuperheating and depressurization system according to claim 1 or 2, characterized in that: A front drain valve (19) is installed on the equipment pipeline (23) at the front end of the medium temperature and medium pressure desuperheating and pressure reducing device (10), and a rear drain valve (20) is installed on the equipment pipeline (23) at the rear end of the medium temperature and medium pressure desuperheating and pressure reducing device (10).

6. The thermal standby equipment of the superheated steam desuperheating and depressurization system according to claim 3, characterized in that: A high-pressure steam inlet isolation electric valve bypass valve I (13) and a high-pressure steam inlet isolation electric valve bypass valve II (15) are provided with a high-pressure steam inlet isolation electric valve I rear drain valve (14), and a high-pressure steam inlet isolation electric valve II rear drain valve (16) are provided on the equipment pipeline (23) between the high-pressure steam inlet isolation electric valve bypass valve II (15) and the high-temperature and high-pressure desuperheater and pressure reducer front drain valve (17).

7. The thermal standby equipment of the superheated steam desuperheating and depressurization system according to claim 1 or 2, characterized in that: The high-temperature and high-pressure desuperheating and pressure reducing device (6) is connected to the high-pressure desuperheating water pipeline (27), and the high-pressure desuperheating water pipeline (27) is equipped with a high-pressure desuperheating water regulating valve (4) and a high-pressure steam safety valve (5).

8. The superheated steam desuperheating and depressurization system for maintaining thermal standby equipment according to claim 7, characterized in that: The medium-temperature and medium-pressure desuperheating and pressure reducing device (10) is connected to the medium-pressure desuperheating water pipeline (28), and the medium-pressure desuperheating water pipeline (28) is equipped with a medium-pressure desuperheating water regulating valve (7) and a medium-pressure steam safety valve (9).

9. The thermal standby equipment of the superheated steam desuperheating and depressurization system according to claim 8, characterized in that: The high-pressure desuperheating water pipeline (27) is connected to the high-pressure main water supply pipeline (29), and the medium-pressure desuperheating water pipeline (28) is connected to the high-pressure main water supply pipeline (29).

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