Bypass pressure regulating device for preventing overpressure of outlet of water pump

Abstract

The utility model provides a bypass pressure regulating device for preventing overpressure of an outlet of a water pump. The bypass pressure regulating device is applied to a methane steam reforming hydrogen production system. The methane steam reforming hydrogen production system comprises a reactor, a gas-liquid separator and a subsequent purification process, and the reactor is communicated with the subsequent purification process through the gas-liquid separator; the gas-liquid separator is further connected with a water replenishing system, the water replenishing system comprises a water replenishing pump, a water replenishing inlet pipe, a water replenishing outlet pipe and a switch valve, and the inlet end of the water replenishing pump is communicated with the water replenishing inlet pipe. The bypass pipeline is additionally arranged in front of and behind the make-up pump, and the bypass pressure regulating device is arranged on the bypass pipeline, so that when the switch valve fails and does not react, or the switch valve and the make-up pump are not synchronous in starting and stopping actions, the pressure at the make-up water outlet pipe is increased, and the bypass pipeline is opened by the bypass pressure regulating device; liquid in the water replenishing outlet pipe can flow back into the water replenishing inlet pipe through the bypass pipeline and the bypass adjusting device, and overpressure of an outlet of the water replenishing pump can be effectively prevented.

Description

Technical Field

[0001] This utility model relates to the technical field of pipeline pressure regulating equipment, and in particular to a bypass pressure regulating device for preventing overpressure at the outlet of a water pump. Background Technology

[0002] Methane steam reforming is an important industrial method for hydrogen production. Methane reacts with steam at high temperature in the presence of a catalyst to produce hydrogen and carbon monoxide. The carbon monoxide then undergoes a shift reaction with the steam to produce hydrogen and carbon dioxide. The equation is as follows:

[0003] Reforming reaction: CH4 + H2O → CO + 3H2

[0004] Transformation reaction: CO + H₂O → CO₂ + H₂

[0005] Reforming and shift reactions are both reversible chemical reactions. Excess water vapor favors the rightward shift of the reaction, producing more hydrogen. In industrial applications, the water-to-carbon ratio (H / C) of large-scale plants is around 2, while in small-scale plants it is between 3 and 4. Therefore, after the conversion and shift reactions are complete, some water vapor remains unreacted. The syngas exiting the reaction system is cooled by circulating water and separated into liquid and liquid components. The condensed water is then returned to the system for reuse, and the makeup water pump only needs to replenish the amount of water used in the reaction. If a blockage occurs in the pipeline between the makeup water pump outlet and the gas-liquid separator, it will cause overpressure in that section of the pipeline, leading to damage and reduced service life. Utility Model Content

[0006] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide a bypass pressure regulating device to prevent overpressure at the outlet of a water pump, which is used to solve the problem of overpressure in the pipeline between the outlet of the water pump and the gas-liquid separator in a methane steam reforming hydrogen production system.

[0007] To achieve the above objectives, this utility model provides a bypass pressure regulating device to prevent overpressure at the outlet of a water pump, applied in a methane steam reforming hydrogen production system. The methane steam reforming hydrogen production system includes a reactor, a gas-liquid separator, and a subsequent purification process. The reactor and the subsequent purification process are connected via the gas-liquid separator. The gas-liquid separator is also connected to a water supply system, which includes a water supply pump, a water supply inlet pipe, a water supply outlet pipe, and a switch valve. The inlet of the water supply pump is connected to the water supply inlet pipe, and the outlet of the water supply pump is connected to the gas-liquid separator via the water supply outlet pipe. The switch valve is located on the water supply outlet pipe. A bypass pipe is also provided between the water supply inlet pipe and the water supply outlet pipe, and the bypass pressure regulating device is located on the bypass pipe to regulate the pressure in the water supply outlet pipe.

[0008] Preferably, the methane steam reforming hydrogen production system further includes a cooler and a water inlet pump. The reactor has a reactor water inlet, a reactor gas inlet, and a reactor gas outlet. The reactor water inlet is connected to the water inlet pump, the reactor gas inlet is used to introduce methane, and the reactor gas outlet is connected to the inlet of the cooler. The gas-liquid separator has a separator gas inlet, a separator gas outlet, and a separator liquid outlet. The separator gas inlet is connected to the outlet of the cooler, the separator gas outlet is connected to the subsequent purification process, and the separator liquid outlet is connected to the water inlet pump.

[0009] Preferably, a temperature transmitter is also provided between the cooler outlet and the separator inlet to detect the temperature parameters of the gas at the cooler outlet.

[0010] Preferably, a check valve is also provided on the water supply pipe between the switching valve and the gas-liquid separator.

[0011] Preferably, filters are installed between the separator outlet and the water inlet pump, and on the water replenishment pipe.

[0012] Preferably, the gas-liquid separator is further provided with a level transmitter, which is used to detect the liquid level in the gas-liquid separator; the level transmitter is connected to the switching valve through a level indicator controller; and the water supply pump is connected to the level indicator controller.

[0013] Preferably, the bypass pressure regulating device adopts a self-regulating valve, which is set with a critical pressure. When the pressure in the water supply outlet pipe is not less than the critical pressure of the self-regulating valve, the self-regulating valve opens, and the water in the water supply outlet pipe flows back to the water supply inlet pipe through the self-regulating valve.

[0014] Preferably, the bypass pressure regulating device includes a pneumatic regulating valve and a pressure transmitter, wherein the pneumatic regulating valve is connected to the pressure transmitter; the pressure transmitter is set with a critical pressure and is used to detect the pressure in the water supply outlet pipe; when the pressure in the water supply outlet pipe is not less than the critical pressure of the pressure transmitter, the pressure transmitter controls the pneumatic regulating valve to open, and the water in the water supply outlet pipe flows back to the water supply inlet pipe through the pneumatic regulating valve.

[0015] As described above, the bypass pressure regulating device for preventing overpressure at the water pump outlet relates to this utility model has the following beneficial effects:

[0016] This utility model relates to a bypass pressure regulating device for preventing overpressure at the outlet of a water pump. Bypass pipes are added before and after the water supply pump, and a bypass pressure regulating device is installed on the bypass pipes. When the switching valve fails to respond or the starting and stopping actions of the switching valve and the water supply pump are not synchronized, the pressure at the water supply outlet pipe increases. The bypass pressure regulating device opens the bypass pipe, and the liquid in the water supply outlet pipe will flow back to the water supply inlet pipe through the bypass pipe and the bypass regulating device, which can effectively prevent overpressure at the outlet of the water supply pump. Attached Figure Description

[0017] Figure 1 This is a flowchart of the first embodiment of the bypass pressure regulating device for preventing overpressure at the outlet of a water pump, which relates to this utility model.

[0018] Figure 2 This is a flowchart of the second embodiment of the bypass pressure regulating device for preventing overpressure at the outlet of a water pump, which relates to this utility model.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Gas-liquid separator; 2. Water supply pump; 3. Water supply inlet pipe; 4. Water supply outlet pipe; 5. Switch valve; 6. Bypass pipe; 7. Filter; 8. Cooler; 9. Temperature transmitter; 10. Check valve; 11. Level transmitter; 12. Level indicator controller; 13. Water supply pump; 14. Self-regulating control valve; 15. Pneumatic control valve; 16. Pressure transmitter. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0022] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0023] like Figure 1 , Figure 2As shown, this utility model provides a bypass pressure regulating device to prevent overpressure at the outlet of a water pump, applied to a methane steam reforming hydrogen production system. The methane steam reforming hydrogen production system includes a reactor, a gas-liquid separator 1, and a subsequent purification process. The reactor and the subsequent purification process are connected through the gas-liquid separator 1. The gas-liquid separator 1 is also connected to a water supply system, which includes a water supply pump 2, a water supply inlet pipe 3, a water supply outlet pipe 4, and a switch valve 5. The inlet end of the water supply pump 2 is connected to the water supply inlet pipe 3, and the outlet end of the water supply pump 2 is connected to the gas-liquid separator 1 through the water supply outlet pipe 4. The switch valve 5 is installed on the water supply outlet pipe 4. A bypass pipe 6 is also provided between the water supply inlet pipe 3 and the water supply outlet pipe 4. The bypass pressure regulating device is installed on the bypass pipe 6 to regulate the pressure in the water supply outlet pipe 4.

[0024] This utility model relates to a bypass pressure regulating device for preventing overpressure at the outlet of a water pump. It includes a bypass pipe 6, which connects the water supply outlet pipe 4 at the outlet of the water supply pump 2 to the water supply inlet pipe 3 at the inlet of the water supply pump 2. The bypass pipe 6 can be opened and closed by the bypass pressure regulating device. When the pressure in the water supply outlet pipe 4 is high, the bypass pressure regulating device opens the bypass pipe 6, allowing water in the water supply outlet pipe 4 to flow back to the water supply inlet pipe 3 via the bypass pipe 6 and the bypass pressure regulating device, thus preventing damage to that section of the pipe due to excessive pressure in the water supply outlet pipe 4.

[0025] Preferred, such as Figure 1 , Figure 2 As shown, the methane steam reforming hydrogen production system also includes a cooler 8 and a water pump 13. The reactor has a reactor water inlet, a reactor gas inlet, and a reactor gas outlet. The reactor water inlet is connected to the water pump 13 through a pipeline. The reactor gas inlet is used to introduce methane. The reactor gas outlet is connected to the inlet of the cooler 8 through a pipeline. The gas-liquid separator 1 has a separator gas inlet, a separator gas outlet, and a separator liquid outlet. The separator gas inlet is connected to the outlet of the cooler 8 through a pipeline. The separator gas outlet is connected to the subsequent purification process through a pipeline. The separator liquid outlet is connected to the water pump 13 through a pipeline.

[0026] In this embodiment, methane enters the reactor through the reactor inlet, and deionized water enters the reactor through the inlet pump 13 and the reactor inlet. The reactor provides reaction conditions for the reforming and shift reactions of methane and water vapor, and the final product is a mixture of carbon dioxide, hydrogen, and water vapor. The mixture enters the cooler 8 through the reactor outlet. After the cooler 8 cools the mixture, it enters the gas-liquid separator 1 through the separator inlet. The water vapor condenses in the gas-liquid separator 1 and is recycled back to the reactor through the separator outlet and the inlet pump 13 for further reaction. The mixture of carbon dioxide and hydrogen is connected to the subsequent purification process through the separator outlet. The subsequent purification process separates and purifies the carbon dioxide and hydrogen to complete the hydrogen production.

[0027] Preferred, such as Figure 1 , Figure 2 As shown, a temperature transmitter 9 is also installed on the pipe between the outlet of the cooler 8 and the inlet of the separator to detect the temperature parameter of the gas at the outlet of the cooler 8. In this embodiment, the temperature transmitter 9 is used to detect the temperature parameter of the gas at the outlet of the cooler 8 in real time. When the temperature parameter is not within the set temperature parameter range, the flow rate or flow rate of the coolant in the cooler 8 will be adjusted, thereby adjusting the temperature parameter at the outlet of the cooler 8 to ensure that the water vapor in the mixed gas can condense and precipitate in the gas-liquid separator 1.

[0028] Preferred, such as Figure 1 , Figure 2 As shown, a check valve 10 is also installed on the water supply outlet pipe 4 between the switch valve 5 and the gas-liquid separator 1. In this embodiment, the purpose of installing the check valve 10 is to prevent condensate vapor or mixed gas in the gas-liquid separator 1 from entering the water supply outlet pipe 4.

[0029] Preferred, such as Figure 1 , Figure 2 As shown, filters 7 are installed between the separator outlet and the inlet pump 13, and on the water supply pipe 3. In this embodiment, the filter 7 is a Y-type filter 7, used to filter deionized water.

[0030] Preferred, such as Figure 1 , Figure 2 As shown, a level transmitter 11 is also provided on the gas-liquid separator 1. The level transmitter 11 is used to detect the liquid level in the gas-liquid separator 1. The level transmitter 11 is connected to the switch valve 5 through a level indicator controller 12. The water pump 2 is connected to the level indicator controller 12.

[0031] In this embodiment, the level transmitter 11 is used to detect the liquid level in the gas-liquid separator 1 and is communicatively connected to the level indicator controller 12. When the level transmitter 11 detects that the liquid level in the gas-liquid separator 1 is low, it means that the amount of water vapor condensation is insufficient to meet the hydrogen production reaction in the reactor. Therefore, water needs to be added through the water replenishment system. At this time, the level transmitter 11 sends a signal to the level indicator controller 12. After receiving the signal, the level indicator controller 12 starts the water replenishment pump 2 and opens the switch valve 5. The water replenishment pump 2 injects deionized water into the gas-liquid separator 1 through the water replenishment inlet pipe 3 and the water replenishment outlet pipe 4. The switch valve 5 and the water replenishment pump 2 are closed after the level transmitter 11 detects that the liquid level in the gas-liquid separator 1 is normal.

[0032] Preferred, such as Figure 1 As shown, the bypass pressure regulating device uses a self-regulating valve 14, which has a set critical pressure. When the pressure in the water supply outlet pipe 4 is not less than the critical pressure of the self-regulating valve 14, the self-regulating valve 14 opens, and the water in the water supply outlet pipe 4 flows back to the water supply inlet pipe 3 through the self-regulating valve 14. In this embodiment, the self-regulating valve 14 (i.e. Figure 1 The PCV (pressure from the water supply outlet pipe 4) draws pressure from the water supply outlet pipe 4. When the pressure in the water supply outlet pipe 4 is not less than the critical pressure of the self-regulating valve 14, the self-regulating valve 14 opens, allowing deionized water to flow back and preventing overpressure in the water supply outlet pipe 4. The self-regulating valve 14 operates on a mechanical spring structure. When the pressure in the water supply outlet pipe 4 can overcome the elasticity of the spring structure, the self-regulating valve 14 opens.

[0033] Preferred, such as Figure 2 As shown, the bypass pressure regulating device includes a pneumatic regulating valve 15 and a pressure transmitter 16. The pneumatic regulating valve 15 is connected to the pressure transmitter 16. The pressure transmitter 16 has a set critical pressure and is used to detect the pressure in the water supply outlet pipe 4. When the pressure in the water supply outlet pipe 4 is not less than the critical pressure of the pressure transmitter 16, the pressure transmitter 16 controls the pneumatic regulating valve 15 to open, and the water in the water supply outlet pipe 4 flows back to the water supply inlet pipe 3 through the pneumatic regulating valve 15. In this embodiment, the pressure regulator (i.e. Figure 2 The pressure transmitter 16 (PT) takes pressure from the water supply outlet pipe 4 and compares the detected pressure parameter with the set critical pressure. When the pressure in the water supply outlet pipe 4 is not less than the critical pressure, the pressure transmitter 16 sends a signal to the control component of the pneumatic regulating valve 15, and the pneumatic regulating valve 15 opens, allowing deionized water to flow back and preventing overpressure in the water supply outlet pipe 4. Furthermore, the pressure transmitter 16 automatically adjusts the opening of the pneumatic regulating valve 15 according to the pressure parameter, achieving high adjustment accuracy and greater convenience.

[0034] The working principle of the bypass pressure regulating device for preventing overpressure at the outlet of a water pump involved in this utility model is as follows:

[0035] First, the operator follows the instructions in the appendix. Figure 1 , Figure 2 The above description of each component is used to manufacture and assemble the aforementioned components.

[0036] Secondly, after connecting the aforementioned components, the operator feeds methane into the reactor through the reactor inlet and deionized water into the reactor through the inlet pump 13 and reactor inlet. The reactor provides reaction conditions for the reforming and conversion reactions of methane and water vapor, with the final product being a mixture of carbon dioxide, hydrogen, and water vapor. This mixture enters the cooler 8 through the reactor outlet. The cooler 8 cools the mixture and then it enters the gas-liquid separator 1 through the separator inlet. The water vapor condenses in the gas-liquid separator 1 and is recycled back to the reactor through the separator outlet and inlet pump 13 for further reaction. The mixture of carbon dioxide and hydrogen is connected to the subsequent purification process through the separator outlet. The subsequent purification process separates and purifies the carbon dioxide and hydrogen, completing the hydrogen production.

[0037] When water vapor condenses in the gas-liquid separator 1, the level transmitter 11 monitors the liquid level in the gas-liquid separator 1 in real time and communicates with the level indicator controller 12. When the level transmitter 11 detects that the liquid level in the gas-liquid separator 1 is low, it means that the amount of water vapor condensed is insufficient to meet the hydrogen production reaction in the reactor. Therefore, water needs to be added through the water replenishment system. At this time, the level transmitter 11 sends a signal to the level indicator controller 12. After receiving the signal, the level indicator controller 12 starts the water replenishment pump 2 and opens the switch valve 5. The water replenishment pump 2 injects deionized water into the gas-liquid separator 1 through the water replenishment inlet pipe 3 and the water replenishment outlet pipe 4. The switch valve 5 and the water replenishment pump 2 are closed after the level transmitter 11 detects that the liquid level in the gas-liquid separator 1 is normal.

[0038] When the water pump 2 replenishes water to the gas-liquid separator 1, the bypass pressure regulating device monitors the pressure in the water supply outlet pipe 4 in real time. When the pressure in the water supply outlet pipe 4 is not less than the set critical pressure (e.g., the switch valve 5 is faulty, or the switch valve 5 and the water pump 2 are not synchronized in starting and stopping), the bypass pressure regulating device is activated, and the deionized water flows back to the water supply inlet pipe 3 to avoid overpressure in the water supply outlet pipe 4.

[0039] The present invention relates to a bypass pressure regulating device for preventing overpressure at the outlet of a water pump. By setting a bypass pipe 6 and a bypass pressure regulating device on the bypass pipe 6, when the pressure at the water supply outlet pipe 4 is too high, the bypass pressure regulating device opens the bypass pipe 6, and the liquid in the water supply outlet pipe 4 flows back to the water supply inlet pipe 3 through the bypass pipe 6 and the bypass regulating device, effectively preventing overpressure at the outlet of the water supply pump 2.

[0040] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0041] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A bypass pressure regulating device for preventing overpressure at the outlet of a water pump, which is applied to a hydrogen production system by means of steam reforming of methane, the hydrogen production system by means of steam reforming of methane comprising a reactor, a gas-liquid separator (1), and a subsequent purification process, the reactor being communicated with the subsequent purification process through the gas-liquid separator (1), characterized in that: the gas-liquid separator (1) is further connected with a water supplement system, the water supplement system comprising a water supplement pump (2), a water supplement inlet pipe (3), a water supplement outlet pipe (4), and an on-off valve (5), the inlet end of the water supplement pump (2) being communicated with the water supplement inlet pipe (3), the outlet end of the water supplement pump (2) being communicated with the gas-liquid separator (1) through the water supplement outlet pipe (4), and the on-off valve (5) being arranged on the water supplement outlet pipe (4); a bypass pipe (6) is further arranged between the water supplement inlet pipe (3) and the water supplement outlet pipe (4), and the bypass pressure regulating device is arranged on the bypass pipe (6) to regulate the pressure in the water supplement outlet pipe (4). The hydrogen production system by means of steam reforming of methane further comprises a cooler (8) and a water inlet pump (13), and the reactor is provided with a reactor water inlet, a reactor gas inlet, and a reactor gas outlet; the reactor water inlet is communicated with the water inlet pump (13), the reactor gas inlet is used for feeding in methane, and the reactor gas outlet is communicated with the inlet of the cooler (8); the gas-liquid separator (1) is provided with a separator gas inlet, a separator gas outlet, and a separator liquid outlet; the separator gas inlet is communicated with the outlet of the cooler (8), the separator gas outlet is communicated with the subsequent purification process, and the separator liquid outlet is communicated with the water inlet pump (13). A temperature transmitter (9) is further arranged between the outlet of the cooler (8) and the separator gas inlet to detect the temperature parameter of the gas at the outlet of the cooler (8).

2. The bypass pressure regulating device for preventing overpressure at the outlet of a water pump according to claim 1, characterized in that: A check valve (10) is further arranged on the water supplement outlet pipe (4) between the on-off valve (5) and the gas-liquid separator (1).

3. The bypass pressure regulating device for preventing overpressure at the outlet of a water pump according to claim 2, characterized in that: A filter (7) is arranged on the water supplement inlet pipe (3) between the separator liquid outlet and the water inlet pump (13).

4. The bypass pressure regulating device for preventing overpressure at the outlet of a water pump according to claim 2, characterized in that: A liquid level transmitter (11) is further arranged on the gas-liquid separator (1) to detect the liquid level in the gas-liquid separator (1); the liquid level transmitter (11) is connected with the on-off valve (5) through a liquid level indication controller (12); and the water supplement pump (2) is connected with the liquid level indication controller (12).

5. The bypass pressure regulating device for preventing overpressure at the outlet of a water pump according to claim 2, characterized in that: The bypass pressure regulating device adopts a self-operated regulating valve (14) provided with a critical pressure; when the pressure in the water supplement outlet pipe (4) is not less than the critical pressure of the self-operated regulating valve (14), the self-operated regulating valve (14) is opened, and the water in the water supplement outlet pipe (4) is returned to the water supplement inlet pipe (3) through the self-operated regulating valve (14).

6. The bypass pressure regulating device for preventing overpressure at the outlet of a water pump according to claim 1, characterized in that: ​ 7. The bypass pressure regulating device for preventing overpressure at the outlet of a water pump according to claim 1, characterized in that: ​ 8. The bypass pressure regulating device for preventing overpressure at the outlet of a water pump according to claim 1, characterized in that: The bypass pressure regulating device comprises a pneumatic regulating valve (15) and a pressure transmitter (16), the pneumatic regulating valve (15) is connected with the pressure transmitter (16); the critical pressure is set in the pressure transmitter (16), and the pressure transmitter (16) is used for detecting the pressure in the water supplement outlet pipe (4); when the pressure in the water supplement outlet pipe (4) is not less than the critical pressure of the pressure transmitter (16), the pressure transmitter (16) controls the pneumatic regulating valve (15) to open, and the water in the water supplement outlet pipe (4) flows back to the water supplement inlet pipe (3) through the pneumatic regulating valve (15).

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