Condensate water recovery device for hydrogen production

Abstract

The utility model discloses a kind of condensate water recovery devices for hydrogen production, including the condensate water collecting unit for gathering high-temperature high-pressure condensate water generated by hydrogen production system, condensate water collecting unit is connected with the pretreatment unit for carrying out preliminary filtration and impurity removal to condensate water, pressure regulating and flash unit for condensate water pressure reduction and make part of condensate water flash as steam, heat recovery unit for heating low-temperature fluid using the heat of high-temperature condensate water and storage and transport unit for storing condensate water after processing in sequence by conveying pipeline in rear in sequence;Pressure regulating and flash unit includes the pressure regulating valve for condensate water pressure reduction and the flash tank for part of condensate water flash as steam, steam outlet of flash tank is connected with heat-using equipment of hydrogen production system, condensate water inlet of flash tank is connected with pretreatment unit by third conveying pipeline, and pressure regulating valve is arranged on third conveying pipeline.The utility model is high in recovery efficiency, simple in equipment and stable in operation.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen production technology, specifically to a condensate recovery device for hydrogen production. Background Technology

[0002] Hydrogen production systems generate large amounts of high-temperature, high-pressure condensate during the hydrogen production process. This condensate typically contains significant amounts of heat; direct discharge would not only waste water resources but also remove substantial amounts of heat energy, increasing hydrogen production costs. Currently, while some condensate recovery technologies exist, they generally suffer from low recovery efficiency, complex equipment, and unstable operation, failing to meet the hydrogen production industry's demand for efficient condensate recovery and utilization. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a condensate recovery device for hydrogen production, so as to solve the problems of low efficiency, complex equipment and unstable operation of hydrogen production condensate recovery in the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0005] A condensate recovery device for hydrogen production includes a condensate collection unit for collecting high-temperature, high-pressure condensate generated by a hydrogen production system. Following the condensate collection unit, a pretreatment unit for initial filtration and impurity removal of the condensate, a pressure regulating and flash evaporation unit for depressurizing the condensate and flashing a portion of it into steam, a heat recovery unit for heating a low-temperature fluid using the heat from the high-temperature condensate, and a storage and transport unit for storing the treated condensate. The pressure regulating and flash evaporation unit includes a pressure regulating valve for depressurizing the condensate and a flash tank for flashing a portion of the condensate into steam. The steam outlet of the flash tank is connected to the heat-using equipment of the hydrogen production system via a steam pipe, and the condensate inlet of the flash tank is connected to the condensate outlet of the pretreatment unit via a third transport pipe. The pressure regulating valve is located on the third transport pipe.

[0006] Preferably, the condensate collection unit includes a water collection tank, an inlet at the top of the water collection tank connected to a main collection pipe, the main collection pipe connected to several collection branch pipes corresponding to each condensate generating device in the hydrogen production system, valves on both the collection branch pipes and the main collection pipe, a first liquid level sensor inside the water collection tank, the output of the first liquid level sensor connected to a PLC controller, and the output of the PLC controller connected to the controlled end of the valve.

[0007] Preferably, the pretreatment unit includes a filter using multi-media filter material to filter solid particulate impurities in the condensate and an iron separator to remove ferromagnetic impurities in the condensate. The condensate inlet of the filter is connected to the condensate outlet of the collection tank through a first conveying pipe. A first pump is installed on the first conveying pipe. The condensate outlet of the filter is connected to the condensate inlet of the iron separator through a second conveying pipe. The condensate outlet of the iron separator is connected to a third conveying pipe. The output terminal of the PLC controller is connected to the controlled terminal of the first pump.

[0008] Preferably, the flash tank is equipped with a second liquid level sensor and a pressure sensor, and the pressure regulating valve is an electrically adjustable regulating valve with an adjustable opening. The input terminal of the PLC controller is connected to the output terminals of the second liquid level sensor and the pressure sensor, respectively, and the output terminal of the PLC controller is connected to the controlled terminal of the pressure regulating valve.

[0009] Preferably, the heat recovery unit is a plate heat exchanger. The high-temperature inlet of the plate heat exchanger is connected to the condensate outlet of the flash tank via a fourth conveying pipe. The high-temperature outlet of the plate heat exchanger is connected to the storage and conveying unit via a fifth conveying pipe. The low-temperature inlet of the plate heat exchanger is connected to the low-temperature hot water supply pipe of the hydrogen production system via a sixth conveying pipe. The low-temperature outlet of the plate heat exchanger is connected to the heat-using equipment of the hydrogen production system via a seventh conveying pipe. A second pump is installed on the fifth conveying pipe, and a third pump is installed on the sixth conveying pipe. The controlled ends of the second and third pumps are respectively connected to the output end of the PLC controller.

[0010] Preferably, the storage and conveying unit includes a water storage tank and a fourth pump. The water storage tank is equipped with a third liquid level sensor. The condensate inlet of the water storage tank is connected to a fifth pipeline. The condensate outlet of the water storage tank is connected to the water point of the hydrogen production system through an eighth conveying pipeline. The fourth pump is installed on the eighth conveying pipeline. The input terminal of the PLC controller is connected to the output terminal of the third liquid level sensor, and the output terminal of the PLC controller is connected to the controlled terminal of the fourth pump.

[0011] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0012] This invention features a condensate collection unit that comprehensively collects condensate from the hydrogen production system; a pretreatment unit that effectively removes impurities from the condensate, ensuring the effectiveness of subsequent processing and the stability of the equipment; a pressure regulation and flash evaporation unit that achieves pressure reduction and flash evaporation of the condensate, recovering some of the heat energy generated for reuse and lowering the temperature and pressure of the condensate for easier subsequent processing; a heat recovery unit that fully utilizes the heat from the high-temperature condensate to heat the low-temperature fluid, improving energy efficiency; and a storage and transportation unit that enables stable storage and on-demand transportation of the condensate. The overall structure is simple, the operation is stable, and it is energy and water efficient, effectively improving the recycling rate of condensate for hydrogen production and reducing hydrogen production costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] The components include: 1. Condensate collection unit, 101. Water collection tank, 102. Main collection pipe, 103. Collection branch pipe, 104. Valve, 2. Pretreatment unit, 21. Filter, 22. Iron remover, 3. Pressure regulation and flash evaporation unit, 31. Pressure regulating valve, 32. Flash tank, 4. Heat recovery unit, 5. Storage and transportation unit, 51. Water storage tank, 52. Fourth pump, 6. First transportation pipeline, 7. Second transportation pipeline, 8. Third transportation pipeline, 9. Fourth transportation pipeline, 10. Fifth transportation pipeline, 11. Sixth transportation pipeline, 12. Seventh transportation pipeline, 13. Eighth transportation pipeline, 14. Steam pipeline, 15. First pump, 16. Second pump, 17. Third pump. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] A condensate recovery device for hydrogen production, combined with Figure 1 As shown, it includes a condensate collection unit 1, a pretreatment unit 2, a pressure regulation and flash evaporation unit 3, a heat recovery unit 4, and a storage and transportation unit 5, which are connected in sequence through a conveying pipeline.

[0017] The condensate collection unit 1 is used to collect the high-temperature and high-pressure condensate generated by the hydrogen production system. It includes a collection tank 101. The inlet at the top of the collection tank 101 is connected to a main collection pipe 102. The main collection pipe 102 is connected to several collection branch pipes 103. The collection branch pipes 103 are connected to each condensate generating device in the hydrogen production system. Valves 104 are installed on both the collection branch pipes 103 and the main collection pipe 102. The valves 104 are used to control the condensate collection flow rate and on / off state. A first liquid level sensor is installed inside the collection tank 101. The first liquid level sensor is used to monitor the liquid level of the condensate in the collection tank 101.

[0018] The pretreatment unit 2 is used for preliminary filtration and impurity removal of condensate, including a filter 21 and an iron separator 22. The condensate inlet of filter 21 is connected to the condensate outlet of the collection tank 101 via a first conveying pipe 6. A first pump 15 is installed on the first conveying pipe 6 to pump the condensate into the pretreatment unit 2. Filter 21 uses multi-media filter materials, such as quartz sand and activated carbon, to filter solid particulate impurities in the condensate, preventing impurities from entering subsequent equipment and causing blockage or damage. The condensate outlet of filter 21 is connected to the condensate inlet of iron separator 22 via a second conveying pipe 7. Iron separator 22 is used to remove ferromagnetic impurities in the condensate, such as iron filings.

[0019] The pressure regulation and flash evaporation unit 3 is used to depressurize the condensate and flash a portion of it into steam. It includes a pressure regulating valve 31 and a flash tank 32. The condensate inlet of the flash tank 32 is connected to the condensate outlet of the iron separator 22 in the pretreatment unit 2 via a third conveying pipe 8. The steam outlet of the flash tank 32 is connected to the heat-using equipment of the hydrogen production system via a steam pipe 14, enabling steam reuse. The flash tank 32 is internally equipped with a second liquid level sensor and a pressure sensor. The second liquid level sensor monitors the liquid level inside the flash tank 32, and the pressure sensor monitors the pressure inside the flash tank 32. The pressure regulating valve 31 is located in the third conveying pipe 8. The pressure regulating valve 31 is an electrically operated regulating valve that automatically adjusts its opening based on the pressure signal inside the flash tank 32. When condensate enters the pressure regulating valve 31, the valve depressurizes the condensate according to the set pressure, and the flash tank 32 flashes a portion of the condensate into steam, achieving gas-liquid separation.

[0020] The heat recovery unit 4 utilizes the heat from the high-temperature condensate to heat the low-temperature fluid. Specifically, the heat recovery unit 4 is a plate heat exchanger. The high-temperature inlet of the plate heat exchanger is connected to the condensate outlet of the flash tank 32 via the fourth conveying pipe 9. The high-temperature outlet of the plate heat exchanger is connected to the storage and conveying unit 5 via the fifth conveying pipe 10. The low-temperature inlet of the plate heat exchanger is connected to the low-temperature hot water supply pipe of the hydrogen production system via the sixth conveying pipe 11. The low-temperature outlet of the plate heat exchanger is connected to the heat-using equipment of the hydrogen production system via the seventh conveying pipe 12. A second pump 16 is installed on the fifth conveying pipe 10 to pump the low-temperature condensate into the storage and conveying unit 5. A third pump 17 is installed on the sixth conveying pipe 11 to pump the low-temperature water from the low-temperature hot water supply pipe of the hydrogen production system into the plate heat exchanger. The high-temperature condensate exchanges heat with the low-temperature hot water in the plate heat exchanger, heating the low-temperature hot water and lowering its own temperature.

[0021] Storage and delivery unit 5 is used to store processed condensate, including a storage tank 51 and a fourth pump 52. A third liquid level sensor is installed inside the storage tank 51 to monitor the liquid level. The condensate inlet of the storage tank 51 is connected to a fifth pipe 10, and the condensate outlet of the storage tank 51 is connected to the water point of the hydrogen production system via an eighth delivery pipe 13. The fourth pump 52 is installed on the eighth delivery pipe 13 and is used to pump the condensate from the storage tank 51 into the water point of the hydrogen production system.

[0022] The device also includes a PLC controller. The input terminals of the PLC controller are connected to the output terminals of the first liquid level sensor, the second liquid level sensor, the third liquid level sensor, and the pressure sensor, respectively. The output terminals of the PLC controller are connected to the controlled terminals of valve 104, pressure regulating valve 31, first pump 15, second pump 16, third pump 17, and fourth pump 52, respectively. The PLC controller is used to monitor and control the operating parameters of the device. Based on the signals fed back from the first and third liquid level sensors, the PLC controller controls the opening and closing of valve 104 and the start and stop of the first pump 15, second pump 16, and third pump 17 to control the condensate return water. Based on the signals fed back from the second liquid level sensor and the pressure sensor, the PLC controller automatically adjusts the opening of pressure regulating valve 31 to maintain stable pressure in flash tank 32. Based on the signal fed back from the third liquid level sensor, the PLC controller controls the start and stop of fourth pump 52. At the same time, the PLC controller can also monitor the operating status of the entire device and provide fault alarms.

[0023] In use, the high-temperature, high-pressure condensate generated by the hydrogen production system is collected through the collection branch pipe 103 and the main collection pipe 102 of the condensate collection unit 1, and then pumped into the pretreatment unit 2 by the first pump 105. In the pretreatment unit 2, the condensate passes through the filter 21 and the iron remover 22 in sequence to remove solid particulate impurities and ferromagnetic impurities, and then enters the pressure regulating and flash evaporation unit 3 through the third conveying pipe 8. The pressure regulating valve 31 adjusts its opening according to the pressure in the flash tank 32, so that the condensate is depressurized before entering the flash tank 32. Some of the water is flashed into steam, and gas-liquid separation occurs in the flash tank 32. The steam generated in the flash tank 32 is transported to the heat-using equipment of the hydrogen production system through the steam pipe 14. The condensate in the flash tank 32 enters the heat recovery unit 4 through the fourth conveying pipe 9, where it exchanges heat with the low-temperature hot water, and its temperature decreases. Then, it enters the water storage tank 51 of the storage and conveying unit 5 through the fifth conveying pipe 10. When the liquid level in the water storage tank 51 reaches a certain height, the third liquid level sensor sends a signal, and the PLC controller controls the fourth pump 52 to start, so as to transport the water from the eighth conveying pipeline 13 in the water storage tank 51 to the water point of the hydrogen production system.

Claims

1. A condensate recovery device for hydrogen production, characterized in that: The system includes a condensate collection unit (1) for collecting high-temperature and high-pressure condensate generated by the hydrogen production system. The condensate collection unit (1) is connected in sequence to a pretreatment unit (2) for preliminary filtration and impurity removal of the condensate, a pressure regulating and flash evaporation unit (3) for depressurizing the condensate and flashing some of the condensate into steam, a heat recovery unit (4) for heating low-temperature fluids using the heat of high-temperature condensate, and a storage and transportation unit (5) for storing the treated condensate. The pressure regulating and flash evaporation unit (3) includes a pressure regulating valve (31) for depressurizing the condensate and a flash tank (32) for flashing some of the condensate into steam. The steam outlet of the flash tank (32) is connected to the heat-using equipment of the hydrogen production system through a steam pipe (14). The condensate inlet of the flash tank (32) is connected to the condensate outlet of the pretreatment unit (2) through a third transportation pipe (8). The pressure regulating valve (31) is installed on the third transportation pipe (8).

2. The hydrogen production condensate recovery device according to claim 1, characterized in that: The condensate collection unit (1) includes a water collection tank (101), an inlet on the top of the water collection tank (101) is connected to a main collection pipe (102), the main collection pipe (102) is connected to several collection branch pipes (103) that are connected one-to-one with each condensate generating device in the hydrogen production system, and valves (104) are provided on both the collection branch pipes (103) and the main collection pipe (102). A first liquid level sensor is provided inside the water collection tank (101), the output end of the first liquid level sensor is connected to a PLC controller, and the output end of the PLC controller is connected to the controlled end of the valve (104).

3. The hydrogen production condensate recovery device according to claim 2, characterized in that: The pretreatment unit (2) includes a filter (21) that uses multi-media filter material to filter solid particulate impurities in condensate and an iron remover (22) for removing ferromagnetic impurities in condensate. The condensate inlet of the filter (21) is connected to the condensate outlet of the water collection tank (101) through a first conveying pipe (6). A first pump (15) is installed on the first conveying pipe (6). The condensate outlet of the filter (21) is connected to the condensate inlet of the iron remover (22) through a second conveying pipe (7). The condensate outlet of the iron remover (22) is connected to a third conveying pipe (8). The output terminal of the PLC controller is connected to the controlled terminal of the first pump (15).

4. A condensate recovery device for hydrogen production according to claim 2, characterized in that: The flash tank (32) is equipped with a second liquid level sensor and a pressure sensor. The pressure regulating valve (31) is an electric regulating valve with adjustable opening. The input terminal of the PLC controller is connected to the output terminals of the second liquid level sensor and the pressure sensor respectively. The output terminal of the PLC controller is connected to the controlled terminal of the pressure regulating valve (31).

5. A condensate recovery device for hydrogen production according to claim 2, characterized in that: The heat recovery unit (4) is a plate heat exchanger. The high-temperature side inlet of the plate heat exchanger is connected to the condensate outlet of the flash tank (32) through the fourth conveying pipe (9). The high-temperature side outlet of the plate heat exchanger is connected to the storage and conveying unit (5) through the fifth conveying pipe (10). The low-temperature side inlet of the plate heat exchanger is connected to the low-temperature hot water supply pipe of the hydrogen production system through the sixth conveying pipe (11). The low-temperature side outlet of the plate heat exchanger is connected to the heat-using equipment of the hydrogen production system through the seventh conveying pipe (12). A second pump (16) is installed on the fifth conveying pipe (10), and a third pump (17) is installed on the sixth conveying pipe (11). The controlled ends of the second pump (16) and the third pump (17) are respectively connected to the output end of the PLC controller.

6. A condensate recovery device for hydrogen production according to claim 5, characterized in that: The storage and transport unit (5) includes a water tank (51) and a fourth pump (52). The water tank (51) is equipped with a third liquid level sensor. The condensate inlet of the water tank (51) is connected to the fifth transport pipeline (10). The condensate outlet of the water tank (51) is connected to the water point of the hydrogen production system through the eighth transport pipeline (13). The fourth pump (52) is installed on the eighth transport pipeline (13). The input terminal of the PLC controller is connected to the output terminal of the third liquid level sensor. The output terminal of the PLC controller is connected to the controlled terminal of the fourth pump (52).

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