Pollution discharge device and hydrogen production system

Abstract

According to the blowdown device and the hydrogen production system, in the embodiment of the invention, the double-acting air valve and the single-acting air valve communicate with the air source inlets of the pneumatic valves at the liquid inlet pipe and the liquid outlet pipe of the liquid collection tank correspondingly, and the double-acting air valve and the single-acting air valve are connected in series, so that the interlocking effect of the double-acting air valve and the single-acting air valve can be achieved; the double-acting air valve and the single-acting air valve can be used for sequentially controlling opening and closing of the pneumatic valves at the liquid inlet pipe and the liquid outlet pipe, and the situation that the upper valve and the lower valve of the liquid collecting tank are opened at the same time can be effectively avoided.

Description

Technical Field

[0001] The present application relates to the technical field of electrolytic hydrogen production, and in particular to a sewage discharge device and a hydrogen production system. Background Art

[0002] At present, hydrogen production by alkaline water electrolysis has been widely used in the hydrogen production industry. In the hydrogen production system, the hydrogen / alkali gas-liquid mixture and oxygen / alkali mixture produced by the decomposition of the electrolyzer need to go through the gas-liquid separation process and purification process to separate the hydrogen and oxygen in the mixture from the alkali liquid. The gas-liquid separation and purification process will collect condensate, which needs to be collected by a water collector and then discharged.

[0003] In order to realize automatic drainage of the water collector, it is necessary to set up an upper and lower valve series structure on the drainage pipeline connected to the water collector and perform an electrical interlocking design.

[0004] However, the above structural design cannot effectively avoid the situation where the upper and lower valves are opened at the same time, which may easily cause a large amount of air to be suddenly discharged on one side, thereby causing a huge fluctuation in the liquid level in the connected gas-water separator, causing system decompression and gas cross-talk, affecting system operation and even causing danger. Utility Model Content

[0005] The technical problem to be solved by the present application is to provide a sewage discharge device and a hydrogen production system to solve the problem that the existing design cannot effectively avoid the simultaneous opening of the upper and lower valves of the water collector in the hydrogen production system.

[0006] In order to solve the above problems, the present application is implemented through the following technical solutions:

[0007] The present application proposes a sewage discharge device for a hydrogen production system, which includes a first pneumatic valve, a second pneumatic valve, a liquid collecting tank, a double-acting gas valve, a single-acting gas valve and a control system;

[0008] The liquid collecting tank is connected to the bottom of the gas-water separator through a liquid inlet pipe;

[0009] The first pneumatic valve is arranged at the liquid inlet pipe, and the second pneumatic valve is arranged at the liquid discharge pipe of the liquid collecting tank;

[0010] The double-acting gas valve at least includes a first gas source inlet, a first gas source outlet and a second gas source outlet, and the single-acting gas valve at least includes a second gas source inlet and a third gas source outlet;

[0011] The gas source inlet of one of the first pneumatic valve and the second pneumatic valve is communicated with the first gas source outlet, and the gas source inlet of the other of the first pneumatic valve and the second pneumatic valve is communicated with the third gas source outlet;

[0012] The first gas source inlet is connected to the main control gas source;

[0013] The second gas source outlet is in communication with the second gas source inlet;

[0014] The control system is electrically connected to the double-acting air valve and the single-acting air valve, and is used to adjust the air paths of the double-acting air valve and the single-acting air valve to control the opening and closing of the first pneumatic valve and the second pneumatic valve.

[0015] Optionally, in the sewage discharge device, the air source inlet of the first pneumatic valve is connected to the first air source outlet, and the air source inlet of the second pneumatic valve is connected to the third air source outlet.

[0016] Optionally, in the sewage discharge device, the double-acting air valve is a two-position five-way solenoid valve, and the single-acting air valve is a two-position three-way solenoid valve.

[0017] Optionally, in the sewage discharge device, when the air source does not enter, the first pneumatic valve is in a closed state;

[0018] When the air source does not enter, the second pneumatic valve is in a closed state.

[0019] Optionally, in the sewage discharge device, when the double-acting gas valve is powered off, the first gas source inlet is connected to the second gas source outlet;

[0020] When the double-acting gas valve is powered on, the first gas source inlet and the first gas source outlet in the double-acting gas valve are connected.

[0021] Optionally, in the sewage discharge device, when the single-acting gas valve is powered off, the second gas source inlet and the third gas source outlet are not connected;

[0022] When the single-acting gas valve is powered on, the second gas source inlet is connected to the third gas source outlet.

[0023] Optionally, in the sewage discharge device, a plurality of the first pneumatic valve and the double-acting air valve are provided, the front end of the liquid collecting tank is respectively connected to the bottom pipes of the plurality of gas-water separators, and a first pneumatic valve is provided between each gas-water separator and the liquid collecting tank;

[0024] The air source inlet of each of the first pneumatic valves is communicated with the first air source outlet of one of the double-acting air valves, and the air source inlet of the second pneumatic valve is communicated with the third air source outlet of the single-acting air valve;

[0025] The total control air source, the plurality of double-acting air valves and the single single-acting air valve are sequentially connected in series through pipelines.

[0026] Optionally, in the sewage discharge device, multiple double-acting air valves are connected in series in sequence through pipelines, and the first air source inlet of the double-acting air valve located in the first position is connected to the total control air source, the second air source outlet of the double-acting air valve located in the last position is connected to the second air source inlet of the single-acting air valve, and the second air source outlet of the upper one of the two adjacent double-acting air valves is connected to the first air source inlet of the lower one.

[0027] Optionally, in the sewage discharge device, a liquid level sensor is provided in the liquid collecting tank, and the liquid level sensor is electrically connected to the control system and is used to provide the control system with liquid level information of the liquid collecting tank;

[0028] The control system is used to adjust the gas path states of the double-acting gas valve and the single-acting gas valve according to the liquid level information to control the opening and closing of the first pneumatic valve and the second pneumatic valve.

[0029] The present application proposes a hydrogen production system, which includes a gas-water separator and the above-mentioned sewage discharge device.

[0030] Compared with the prior art, this application has the following advantages:

[0031] The sewage discharge device in the present application includes a first pneumatic valve, a second pneumatic valve, a liquid collecting tank, a double-acting air valve, a single-acting air valve and a control system; the liquid collecting tank is connected to the bottom of the gas-water separator through a liquid inlet pipe; the first pneumatic valve is arranged at the liquid inlet pipe, and the second pneumatic valve is arranged at the liquid discharge pipe of the liquid collecting tank; the double-acting air valve at least includes a first air source inlet, a first air source outlet and a second air source outlet, and the single-acting air valve at least includes a second air source inlet and a third air source outlet; the air source inlet of one of the first pneumatic valve and the second pneumatic valve is connected to the first air source outlet, and the air source inlet of the other of the first pneumatic valve and the second pneumatic valve is connected to the third air source outlet; the first air source inlet It is connected to the main control air source; the second air source outlet is connected to the second air source inlet; the control system is electrically connected to the double-acting air valve and the single-acting air valve, and is used to control the opening and closing of the first pneumatic valve and the second pneumatic valve through the double-acting air valve and the single-acting air valve; wherein, because the double-acting air valve and the single-acting air valve are respectively connected to the pneumatic valve air source inlets at the liquid inlet pipe and the liquid discharge pipe of the liquid collecting tank, and the double-acting air valve is connected in series with the single-acting air valve, the interlocking effect of the double-acting air valve and the single-acting air valve can be achieved, and the double-acting air valve and the single-acting air valve can be used to control the opening and closing of the pneumatic valves at the liquid inlet pipe and the liquid discharge pipe in turn, which can effectively avoid the situation where the upper and lower valves of the liquid collecting tank are opened at the same time.

[0032] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of an existing hydrogen production system;

[0034] Figure 2 It is a schematic diagram of the structure of the sewage discharge device provided in the first embodiment of the present application;

[0035] Figure 3 It is a schematic diagram of the structure of the sewage discharge device provided in the second embodiment of the present application;

[0036] Figure 4 It is a schematic diagram of the structure of the sewage discharge device provided in the third embodiment of the present application. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0039] In the gas-liquid separation system of the existing hydrogen production system, such as Figure 1 As shown, the hydrogen / alkaline liquid mixture passes through the hydrogen side gas-liquid separator 11 for gas-liquid separation, and the separated alkaline liquid is discharged by gravity from the bottom of the hydrogen side gas-liquid separator 11 and enters the alkaline liquid circulation system; the separated hydrogen is sent out from the upper gas phase outlet of the hydrogen side gas-liquid separator 11; the oxygen / alkaline liquid mixture on the oxygen side passes through the oxygen side gas-liquid separator 12 for gas-liquid separation.

[0040] The hydrogen separated by the hydrogen side gas-liquid separator 11 carries a small amount of alkali liquid and enters the scrubber 13 for washing. The washing water is also used as water for system consumption. The scrubber 13 is provided with an overflow port, which overflows to the hydrogen side gas-liquid separator 11 at the bottom. The washed hydrogen is transported to the gas cooler 14 via the upper gas phase outlet of the scrubber 13.

[0041] As the hydrogen passes through the gas cooler 14 for cooling and temperature reduction, water in the hydrogen gradually condenses and precipitates, and most of the condensate flows back to the hydrogen-side gas-liquid separator 11 through the condensate outlet of the cooler 13, and a small amount of condensate is entrained with the hydrogen to the gas-water separator 15.

[0042] Hydrogen enters the gas-water separator 15 for gas-water separation. The separated gas phase is sent to the subsequent processing unit through the gas phase outlet at the top of the gas-water separator 15, and the separated liquid phase flows to the liquid collecting tank 16 through the liquid phase outlet at the bottom of the gas-water separator 15. When the condensate in the liquid collecting tank 16 reaches a certain liquid level, this part of the liquid is discharged intermittently as process waste liquid at a regular interval.

[0043] Among them, when the hydrogen production system operates normally, the upper valve 17 of the liquid collecting tank remains normally open and the lower valve 18 remains normally closed. The water collected by the upper gas-water separator 15 is accumulated in the liquid collecting tank 16. When the liquid in the liquid collecting tank is collected to a certain extent, the drainage operation is performed regularly.

[0044] However, the opening and closing of the above-mentioned linkage drain valves are controlled by a PLC program. When the program is executed incorrectly, the valves may be opened simultaneously, which may cause serious safety accidents in the hydrogen production equipment.

[0045] Similar to the gas-liquid separation framework, the various water collector drain valves and the main drain valve in the purification system of the hydrogen production system are also opened and closed alternately with each other, and the water collector drain valves or the water collector drain valve and the main drain valve are not allowed to be opened at the same time; however, the opening and closing of the above-mentioned water collector drain valves and the main drain valve are controlled by the PLC program, but when a program execution error occurs, they may be opened at the same time, which will affect the stable operation of the purification system.

[0046] In view of the above problems, the present application provides a sewage discharge device, such as Figures 2 to 4 As shown, it includes a first pneumatic valve 21, a second pneumatic valve 22, a liquid collecting tank 16, a double-acting air valve 23, a single-acting air valve 24 and a controller 25; the liquid collecting tank 16 is connected to the bottom of the gas-water separator 15 through a liquid inlet pipe; the first pneumatic valve 21 is arranged at the liquid inlet pipe, and the second pneumatic valve 22 is arranged at the liquid discharge pipe of the liquid collecting tank 16; the double-acting air valve 23 at least includes a first gas source inlet 231, a first gas source outlet 232 and a second gas source outlet 233, and the single-acting air valve 24 at least includes a second gas source inlet 241 and a third gas source outlet 242; The air source inlet of one of the first pneumatic valve 21 and the second pneumatic valve 22 is connected to the first air source outlet 232, and the air source inlet of the other of the first pneumatic valve 21 and the second pneumatic valve 22 is connected to the third air source outlet 242; the first air source inlet 231 is connected to the total control air source 26; the second air source outlet 233 is connected to the second air source inlet 241; the controller 25 is electrically connected to the double-acting air valve 23 and the single-acting air valve 24, and is used to control the opening and closing of the first pneumatic valve 21 and the second pneumatic valve 22 through the double-acting air valve 23 and the single-acting air valve 24.

[0047] Among them, the first pneumatic valve 21 is arranged at the liquid inlet pipe, that is, the first pneumatic valve 21 is located at the inlet end of the liquid collecting tank 16, as the upper drain valve of the liquid collecting tank 16, used to control the liquid flowing into the liquid collecting tank 16; the second pneumatic liquid inlet, the second pneumatic valve 22 is arranged at the drain pipe of the liquid collecting tank 16, that is, the second pneumatic valve 22 is located at the outlet end of the liquid collecting tank 16, as the lower drain valve of the liquid collecting tank 16, used to control the liquid flowing out of the liquid collecting tank 16.

[0048] The gas source inlet of one of the first pneumatic valve 21 and the second pneumatic valve 22 is connected to the first gas source outlet 232, and the gas source inlet of the other of the first pneumatic valve 21 and the second pneumatic valve 22 is connected to the first gas source outlet 232.

[0049] The three gas source outlets 242 are connected, that is, the double-acting valve is used to control the opening and closing of the first pneumatic valve 21 and the single-acting valve 24 is used to control the opening and closing of the second pneumatic valve 22, or the double-acting valve is used to control the opening and closing of the second pneumatic valve 22 and the single-acting valve 24 is used to control the opening and closing of the first pneumatic valve 21.

[0050] Among them, because the controller 25 is electrically connected to the double-acting air valve 23 and the single-acting air valve 24, the controller 25 can control the power on or off of the double-acting air valve 23 to control the conduction between the first air source inlet 231 and the first air source outlet 232 or the conduction between the first air source inlet 231 and the second air source outlet 233, and control the conduction or disconnection between the second air source inlet 241 and the third air source outlet 242 by controlling the power on or off of the single-acting air valve 24, thereby realizing the use of the double-acting valve to control the opening and closing of the first pneumatic valve 21 and the use of the single-acting air valve 24 to control the opening and closing of the second pneumatic valve 22, or the use of the double-acting valve to control the opening and closing of the second pneumatic valve 22 and the use of the single-acting air valve 24 to control the opening and closing of the first pneumatic valve 21.

[0051] Specifically, when the first gas source outlet 232 of the double-acting gas valve 23 is connected to the first pneumatic valve 21, and the third gas source outlet 242 of the single-acting gas valve 24 is connected to the second pneumatic valve 22, Figure 2 As shown in FIG. 4 , when it is determined that the liquid collecting tank 16 needs to be discharged, the first gas source inlet 231 and the second gas source outlet 233 in the double-acting gas valve 23 are controlled to be connected, that is, the connected first pneumatic valve 21 is closed, and the second gas source inlet 241 and the third gas source outlet 242 in the single-acting gas valve 24 are controlled to be connected, that is, the connected second pneumatic valve 22 is opened, thereby realizing sewage discharge;

[0052] When the first air source outlet 232 of the double-acting air valve 23 is connected to the first pneumatic valve 21, and the third air source outlet 242 of the single-acting air valve 24 is connected to the second pneumatic valve 22, when it is necessary to stop the discharge, the first air source inlet 231 and the first air source outlet 232 in the double-acting air valve 23 are controlled to be connected, that is, the connected first pneumatic valve 21 is opened, and the second air source inlet 241 and the third air source outlet 242 in the single-acting air valve 24 are controlled to be not connected, that is, the connected second pneumatic valve 22 is closed, so as to achieve the continued liquid collection effect.

[0053] exist Figure 2 Or 4, the first gas source inlet 231 is connected to the main control gas source 26, and the second gas source outlet 233 is connected to the second gas source inlet 241, that is, the main control gas source 26, the double-acting gas valve 23 and the single-acting gas valve 24 are connected in series, so the double-acting gas valve 23 can be "hardware interlocked" with the single-acting gas valve 24. Control; at the same time, because when the first gas source inlet 231 and the first gas source outlet 232 are connected, the first gas source inlet 231 and the second gas source outlet 233 are not connected, that is, the gas source cannot be sent to the second pneumatic valve 22 to control its opening and closing, and when the first gas source inlet 231 and the second gas source outlet 233 are connected, the first gas source inlet 231 and the first gas source outlet 232 are not connected, that is, the gas source cannot be sent to the first gas source.

[0054] The first pneumatic valve 21 is used to control its opening and closing, that is, the first pneumatic valve 21 and the second pneumatic valve 22 will not be supplied with air source at the same time, and the two are opened by alternately supplying air source, which makes the operation more reliable and can avoid the situation that the two are opened at the same time.

[0055] Specifically, when the third gas source outlet 242 of the single-acting gas valve 24 is connected to the first pneumatic valve 21, and the first gas source outlet 232 of the double-acting gas valve 23 is connected to the second pneumatic valve 22, Figure 3 As shown, when it is determined that the liquid collecting tank 16 needs to be discharged, the second air source inlet 241 and the third air source outlet 242 in the single-acting air valve 24 are controlled to be disconnected, that is, the connected first pneumatic valve 21 is closed, and the first air source inlet 231 and the first air source outlet 232 in the double-acting air valve 23 are controlled to be connected, that is, the connected second pneumatic valve 22 is opened, thereby realizing sewage discharge.

[0056] When the third air source outlet 242 of the single-acting air valve 24 is connected to the first pneumatic valve 21, and the first air source outlet 232 of the double-acting air valve 23 is connected to the second pneumatic valve 22, when it is necessary to stop the discharge, the second air source inlet 241 and the third air source outlet 242 in the single-acting air valve 24 are controlled to be connected, that is, the connected first pneumatic valve 21 is opened, and the first air source inlet 231 and the second air source outlet 233 in the double-acting air valve 23 are controlled to be connected, that is, the connected second pneumatic valve 22 is closed, so as to realize the continued liquid collection effect.

[0057] exist Figure 3 In the embodiment, the first air source inlet 231 is connected to the main control air source 26, and the second air source outlet 233 is connected to the second air source inlet 241, that is, the main control air source 26, the double-acting air valve 23 and the single-acting air valve 24 are connected in series, so the double-acting air valve 23 can be "hardware interlocked" with the single-acting air valve 24. At the same time, because when the first air source inlet 231 and the first air source outlet 232 are connected, the first air source inlet 231 and the second air source outlet 233 are not connected, that is, the air source cannot be sent to the first pneumatic valve 21 to control its opening and closing, and when the first air source inlet 231 and the second air source outlet 233 are connected, the first air source inlet 231 and the first air source outlet 232 are not connected, that is, the air source cannot be sent to the second pneumatic valve 22 to control its opening and closing, that is, the first pneumatic valve 21 and the second pneumatic valve 22 will not be fed with air at the same time, and the two are alternately fed with air to open, and the operation is more reliable, which can avoid the situation where the two are opened at the same time.

[0058] In the sewage discharge device provided in the embodiment of the present application, because the double-acting air valve 23 and the single-acting air valve 24 are respectively connected to the pneumatic valve gas source inlet at the liquid inlet pipe and the liquid discharge pipe of the liquid collecting tank 16, and the double-acting air valve 23 and the single-acting air valve 24 are connected in series, the interlocking effect of the double-acting air valve 23 and the single-acting air valve 24 can be achieved, and the double-acting air valve 23 and the single-acting air valve 24 can be used to control the opening and closing of the pneumatic valve at the liquid inlet pipe and the liquid discharge pipe in turn, which can effectively prevent the upper and lower valves of the liquid collecting tank 16 from being opened at the same time.

[0059] The system suddenly loses pressure and affects the operation of the system.

[0060] In the sewage discharge device provided in the embodiment of the present application, when the air source does not enter, the first pneumatic valve 21 is in a closed state; when the air source does not enter, the second pneumatic valve 22 is in a closed state. That is, both the first pneumatic valve 21 and the second pneumatic valve 22 are in a default closed state, which can avoid the situation where the upper and lower valves of the liquid collecting tank 16 are opened due to the lack of air source, and further ensure the safety of the system.

[0061] Optionally, in one embodiment, when the double-acting gas valve 23 is powered off, the first gas source inlet 231 is connected to the second gas source outlet 233; when the double-acting gas valve 23 is powered on, the first gas source inlet 231 in the double-acting gas valve 23 is connected to the first gas source outlet 232. That is, the double-acting gas valve 23 is in the closed position by default, and is in the open position only when it is powered on normally, that is, it can introduce gas to the pneumatic valve (the first pneumatic valve 21 or the second pneumatic valve 22) connected to the first gas source outlet 232 and control its opening, thereby avoiding the situation where the pneumatic valve is opened due to power failure, and effectively coping with the danger of system decompression caused by sudden power failure.

[0062] Optionally, in one embodiment, when the single-acting air valve 24 is powered off, the second air source inlet 241 and the third air source outlet 242 are not connected; when the single-acting air valve 24 is powered on, the second air source inlet 241 and the third air source outlet 242 are connected. That is, the single-acting air valve 24 is in the closed position by default, and is in the open position only when it is powered on normally, that is, it can pass the air source to the pneumatic valve (the first pneumatic valve 21 or the second pneumatic valve 22) connected to the third air source outlet 242 and control its opening, thereby avoiding the situation where the pneumatic valve is opened due to power failure, and effectively dealing with the danger of system decompression caused by sudden power failure.

[0063] Optionally, in one embodiment, the gas source inlet of the first pneumatic valve 21 is connected to the first gas source outlet 232, and the gas source inlet of the second pneumatic valve 22 is connected to the third gas source outlet 242. In this embodiment, the double-acting gas valve 23 is used to control the first pneumatic valve 21 disposed at the front end of the liquid collecting tank 16, and the single-acting gas valve 24 is used to control the second pneumatic valve 22 disposed at the rear end of the liquid collecting tank 16, which can cope with power failure, gas loss, etc., and ensure system safety.

[0064] Optionally, in one embodiment, a liquid level sensor (not shown) is provided in the liquid collecting tank 16, which is electrically connected to the controller 25 and is used to provide the controller 25 with liquid level information of the liquid collecting tank 16. The controller 25 is used to control the air path status of the double-acting air valve 23 and the single-acting air valve 24 according to the above liquid level information to control the opening and closing of the first pneumatic valve 21 and the second pneumatic valve 22.

[0065] In this embodiment, by providing a liquid level sensor in the liquid collecting tank 16, the liquid level of the sewage in the liquid collecting tank 16 can be obtained more accurately, so that the sewage can be drained in time.

[0066] Specifically, when the third gas source outlet 242 of the single-acting gas valve 24 is connected to the second pneumatic valve 22, and the first gas source outlet 232 of the double-acting gas valve 23 is connected to the first pneumatic valve 21, when the liquid information of the liquid collecting tank 16 is obtained by using the liquid level sensor, and when it is judged that the liquid level is high and needs to be discharged according to the liquid level information, the first gas source inlet 231 and the second gas source outlet 233 in the double-acting gas valve 23 are controlled to be connected, that is, the connected first pneumatic valve 21 is closed, and the second gas source inlet 241 and the third gas source outlet 242 in the single-acting gas valve 24 are controlled to be connected, that is, the connected second pneumatic valve 22 is opened, thereby realizing sewage discharge;

[0067] Specifically, when the third air source outlet 242 of the single-acting air valve 24 is connected to the second pneumatic valve 22, and the first air source outlet 232 of the double-acting air valve 23 is connected to the first pneumatic valve 21, when the liquid level sensor is used to obtain the liquid information of the liquid collecting tank 16, and when it is judged that the liquid level is low and the discharge can be stopped based on the liquid level information, the first air source inlet 231 and the first air source outlet 232 in the double-acting air valve 23 are controlled to be connected, that is, the connected first pneumatic valve 21 is opened, and the second air source inlet 241 and the third air source outlet 242 in the single-acting air valve 24 are controlled to be not connected, that is, the connected second pneumatic valve 22 is closed, thereby realizing the continued liquid collection effect.

[0068] Specifically, when the third gas source outlet 242 of the single-acting gas valve 24 is connected to the first pneumatic valve 21, and the first gas source outlet 232 of the double-acting gas valve 23 is connected to the second pneumatic valve 22, when the liquid information of the liquid collecting tank 16 is obtained by using the liquid level sensor, and when it is judged that the liquid level is high and needs to be discharged according to the liquid level information, the second gas source inlet 241 and the third gas source outlet 242 in the single-acting gas valve 24 are controlled not to be connected, that is, the connected first pneumatic valve 21 is closed, and the first gas source inlet 231 and the first gas source outlet 232 in the double-acting gas valve 23 are controlled to be connected, that is, the connected second pneumatic valve 22 is opened, thereby realizing sewage discharge;

[0069] Specifically, when the third air source outlet 242 of the single-acting air valve 24 is connected to the first pneumatic valve 21, and the first air source outlet 232 of the double-acting air valve 23 is connected to the second pneumatic valve 22, when the liquid level sensor is used to obtain the liquid information of the liquid collecting tank 16, and when it is judged that the liquid level is low and the discharge can be stopped based on the liquid level information, the second air source inlet 241 and the third air source outlet 242 in the single-acting air valve 24 are controlled to be connected, that is, the connected first pneumatic valve 21 is opened, and the first air source inlet 231 and the second air source outlet 233 in the double-acting air valve 23 are controlled to be connected, that is, the connected second pneumatic valve 22 is closed, thereby realizing the continued liquid collection effect.

[0070] The sewage discharge device provided in the embodiment of the present application can be applied to the gas-liquid separation system and / or the purification system in the hydrogen production system. Accordingly, the above-mentioned liquid collecting tank 16 is a liquid collecting buffer tank in the gas-liquid separation system and / or a water collector in the purification system, and can be applied to the liquid collecting buffer tank on the hydrogen side or the oxygen side.

[0071] For example, for the gas-liquid separation system in the hydrogen production system, when the hydrogen production system is operating normally, the upper valve of the liquid collecting tank 16 (i.e., the first pneumatic valve 21) is normally open, and the lower valve (i.e., the second pneumatic valve 22) is normally closed. The water collected by the upper gas-water separator 15 is collected in the liquid collecting tank 16. When the liquid in the liquid collecting tank 16 is collected to a certain extent, the drainage operation is performed regularly. If the double-acting gas valve 23 is connected to the first pneumatic valve 21, and the single-acting gas valve 24 is connected to the second pneumatic valve 22, the drainage operation includes the following two methods:

[0072] Sewage discharge method 1, first control the first air source inlet 231 and the first air source outlet 232 in the double-acting air valve 23 to be disconnected, so that the first pneumatic valve 21 is closed; then control the first air source inlet 231 and the second air source outlet 233 in the double-acting air valve 23 to be connected, and the second air source inlet 241 and the third air source outlet 242 in the single-acting air valve 24 to be connected, so that the second pneumatic valve 22 is opened, and this state is maintained for 5 to 15 seconds; then control the second air source inlet 241 and the third air source outlet 242 in the single-acting air valve 24 to be disconnected, so that the second pneumatic valve 22 is closed, and then control the first air source inlet 231 and the first air source outlet 232 in the double-acting air valve 23 to be connected, thereby opening the first pneumatic valve 21, and completing a sewage discharge cycle.

[0073] Discharge method 2: Add a liquid level sensor to the liquid collecting tank 16 to control the discharge according to the upper and lower limits of the liquid level:

[0074] When the liquid level in the liquid collecting tank 16 reaches the upper limit, the first air source inlet 231 and the first air source outlet 232 in the double-acting air valve 23 are controlled to be disconnected, so that the first pneumatic valve 21 is closed; then the first air source inlet 231 and the second air source outlet 233 in the double-acting air valve 23 are controlled to be connected, and the second air source inlet 241 and the third air source outlet 242 in the single-acting air valve 24 are controlled to be connected, so that the second pneumatic valve 22 is opened; then when the liquid level in the liquid collecting tank 16 reaches the lower limit, the second air source inlet 241 and the third air source outlet 242 in the single-acting air valve 24 are controlled to be disconnected, so that the second pneumatic valve 22 is closed, and then the first air source inlet 231 and the first air source outlet 232 in the double-acting air valve 23 are controlled to be connected, thereby opening the first pneumatic valve 21, and completing a sewage discharge cycle.

[0075] Optionally, in a specific implementation, the first pneumatic valve 21 and the second pneumatic valve 22 may both be pneumatic ball valves.

[0076] Optionally, in a specific implementation, the double-acting air valve 23 is a two-position five-way solenoid valve, and the single-acting air valve 24 is a two-position three-way solenoid valve.

[0077] In this embodiment, the double-acting air valve 23 also includes a first exhaust port 234 and a second exhaust port 235; when the first air source inlet 231 and the second air source outlet 233 are connected, the first exhaust port 234 and the first air source outlet are connected, that is, the double-acting valve air valve is in a closed position, and the air source in the connected pneumatic valve can be discharged, thereby controlling the pneumatic valve to close; at the same time, when the first air source inlet 231 and the first air source outlet 232 are connected, the second exhaust port 235 and the second air source outlet 233 are connected, and the air source between the second exhaust port 235 and the single-acting air valve 24 can be discharged, that is, the double-acting valve air valve is in an open position, which is convenient for controlling the opening of the pneumatic valve connected to the double-acting valve, and controlling the closing of the pneumatic valve connected to the single-acting valve.

[0078] In this embodiment, the single-acting air valve 24 also includes a third exhaust port 243; when the second air source inlet 241 and the third air source outlet 242 are connected, the second exhaust port 235 and the third exhaust port 243 are not connected, that is, the single-acting valve air valve is in the open position, and the air source can be delivered to the pneumatic valve, thereby controlling the opening of the pneumatic valve; when the second air source inlet 241 and the third air source outlet 242 are not connected, the third exhaust port 243 and the third air source outlet 242 are connected, that is, the single-acting valve air valve is in the closed position, and the air source between the connected pneumatic valve and the single-acting air valve 24 can be exported, so as to facilitate the control of the pneumatic valve connected to the single-acting valve to close.

[0079] Optionally, in one embodiment, Figure 4 As shown, there are multiple first pneumatic valves 21 and double-acting air valves 23, the front ends of the liquid collecting tank 16 are respectively connected to the bottom pipes of the multiple above-mentioned gas-water separators 15, and a first pneumatic valve 21 is arranged between each of the above-mentioned gas-water separators 15 and the liquid collecting tank 16; the air source inlet of each first pneumatic valve 21 is respectively connected to the first air source outlet 232 of a double-acting air valve 23, and the air source inlet of the second pneumatic valve 22 is connected to the third air source outlet 242 of the single-acting air valve 24; the total control air source 26, multiple double-acting air valves 23 and a single single-acting air valve 24 are connected in series in sequence through pipelines.

[0080] In this embodiment, for the situation where there are multiple gas-water separators 15 and a liquid collecting tank 16 connected in the system, such as the purification system in the hydrogen production system, a first pneumatic valve 21 is arranged between each gas-water separator 15 and the liquid collecting tank 16, and each of the first pneumatic valves 21 is controlled to open and close by a separate double-acting gas valve 23, and then a second pneumatic valve 22 is arranged at the rear end of the liquid collecting tank 16, and the opening and closing of the second pneumatic valve 22 is controlled by a single-acting gas valve 24, and the first pneumatic valve 21 and the second pneumatic valve 22 are in a closed state when no gas source is introduced, which can avoid the situation where the first pneumatic valve 21 and the second pneumatic valve 22 are opened at the same time due to power failure or gas failure, and can effectively deal with the risk of system decompression caused by sudden power failure or gas failure.

[0081] In this embodiment, because the total control gas source 26, multiple double-acting gas valves 23 and a single single-acting gas valve 24 are connected in series in sequence through pipelines, the on-off status of the gas source of each gas valve in the double-acting gas valve 23 and the single single-acting gas valve 24 is not only related to the on-off status of its own power, but also depends on the gas path status of the previous gas valve. Therefore, the gas paths between the double-acting gas valves 23 and the single-acting gas valves 24 restrict and influence each other, which can further improve the safety of the device and avoid instantaneous and large-scale decompression of the entire system due to failure of a single gas valve.

[0082] Optionally, in a specific embodiment, multiple double-acting air valves 23 are connected in series in sequence through pipelines, and the first air source inlet 231 of the double-acting air valve 23 located in the first position is connected to the total control air source 26, the first air source outlet 232 of the double-acting air valve 23 located in the last position is connected to the second air source inlet 241 of the single-acting air valve 24, and among two adjacent double-acting air valves 23, the second air source outlet 233 of the upper double-acting air valve 23 is connected to the first air source inlet 231 of the next double-acting air valve 23.

[0083] In this specific embodiment, because in two adjacent double-acting air valves 23, the second air source outlet 233 of the double-acting air valve 23 located at the front end is connected to the first air source inlet 231 of the double-acting air valve 23 at the rear end, and the first air source outlet 232 of each double-acting air valve 23 is connected to the corresponding first pneumatic valve 21, any double-acting air valve 23 needs to control the corresponding first pneumatic valve 21 to open, and not only needs to be in the open position itself, but also requires the double-acting air valve 23 located in the previous position of the double-acting air valve 23 to be in the closed position. At this time, the second air source outlet 233 of the previous double-acting air valve 23 is not connected to its first air source inlet 231, and accordingly, the first air source outlet 232 of the previous double-acting air valve 23 is not connected to its first air source inlet 231, so its corresponding first pneumatic valve 21 cannot be connected to the air source, that is, it is in a closed state. Therefore, the above-mentioned series connection method can effectively avoid the situation where multiple first pneumatic valves 21 located at the front end of the liquid collecting tank 16 are opened at the same time.

[0084] Among them, because the first air source outlet 232 of the double-acting air valve 23 located at the last position is connected to the second air source inlet 241 of the single-acting air valve 24, the single-acting air valve 24 needs to control the corresponding second pneumatic valve 22 to open. It not only needs to be in the open position itself, but also requires all the double-acting air valves 23 located at the front end of the single-acting air valve 24 to be in the closed position. At this time, the second air source outlet 233 of all the double-acting air valves 23 is connected to their first air source inlet 231, and correspondingly, the first air source outlet 232 of each double-acting air valve 23 is not connected to its first air source inlet 231. Therefore, the above-mentioned series connection method can also effectively avoid the situation where the first pneumatic valve 21 located at the front end of the liquid collecting tank 16 and the second pneumatic valve 22 located at the rear end of the liquid collecting tank 16 are opened at the same time.

[0085] For example, in the purification system of the hydrogen production system, the drain valves of each gas-water separator 15 (corresponding to the first pneumatic valve 21) and the main drain valve (corresponding to the second pneumatic valve 22) need to be opened and closed alternately with each other, and the drain valves of the water collector or the drain valves of the water collector and the main drain valve are not allowed to be opened at the same time.

[0086] Among them, the double-acting air valve 23 is connected to the first pneumatic valve 21, and the single-acting air valve 24 is connected to the second pneumatic valve 22; when the purification system is operating normally, the outlet drain valve of the liquid collecting tank 16 is normally closed, and the drain valves of each gas-water separator 15 are also normally closed. The water collected by the upper gas-water separator 15 is collected in the liquid collecting tank 16. When the liquid in the liquid collecting tank 16 is collected to a certain extent, the drainage operation is performed regularly, and the drainage operation includes the following three methods:

[0087] Drainage method 1: The second pneumatic valve 22 is normally closed, and the first pneumatic valves 21 are opened and closed in sequence. Each drain valve is kept open for 10 to 60 seconds. After the first pneumatic valves 21 are actuated in sequence, they are all closed. The second pneumatic valve 22 is opened and closed after being kept for 5 to 15 seconds. The above process is performed regularly.

[0088] Sewage discharge method 2, the second pneumatic valve 22 is normally closed, the first pneumatic valves 21 are opened and closed in sequence, and each first pneumatic valve 21 is kept open for 10 to 60 seconds, and the second pneumatic valve 22 is opened after each first pneumatic valve 21 is opened, and is kept for 5 to 15 seconds before being closed; the above process is performed regularly.

[0089] Discharge method 3: Add a liquid level sensor to the liquid collecting tank 16 to control the discharge according to the upper and lower limits of the liquid level:

[0090] The second pneumatic valve 22 is normally closed, and the first pneumatic valves 21 are opened and closed in sequence, and each sewage valve is kept in the open state for 10 to 60 seconds; when the liquid level in the liquid collecting tank 16 reaches the upper limit, the first pneumatic valve 21 is controlled to be closed, and then the second pneumatic valve 22 is controlled to be opened; when the liquid level in the liquid collecting tank 16 reaches the upper limit, the first pneumatic valve 21 is controlled to be closed, and then the second pneumatic valve 22 is controlled to be opened; when the liquid level in the liquid collecting tank 16 reaches the lower limit, the process of opening the first pneumatic valves 21 in sequence is continued until the liquid level in the liquid collecting tank 16 reaches the upper limit and sewage is discharged again; the above process is executed in a cycle.

[0091] In addition, the present application also proposes a hydrogen production system, which includes a gas-water separator 15 and the sewage discharge device as described above.

[0092] For the above-mentioned hydrogen production system embodiment, it includes the above-mentioned sewage discharge device and can achieve the same technical effect. In order to avoid repetition, it will not be described here. For relevant matters, please refer to the partial description of the sewage discharge device embodiment.

[0093] In summary, in this embodiment, the sewage discharge device in the present application includes a first pneumatic valve, a second pneumatic valve, a liquid collecting tank, a double-acting gas valve, a single-acting gas valve and a control system; the liquid collecting tank is connected to the bottom of the gas-water separator through a liquid inlet pipe; the first pneumatic valve is arranged at the liquid inlet pipe, and the second pneumatic valve is arranged at the collecting tank.

[0094] The double-acting air valve at least includes a first air source inlet, a first air source outlet and a second air source outlet, and the single-acting air valve at least includes a second air source inlet and a third air source outlet; the air source inlet of one of the first pneumatic valve and the second pneumatic valve is connected to the first air source outlet, and the air source inlet of the other of the first pneumatic valve and the second pneumatic valve is connected to the third air source outlet; the first air source inlet is connected to the total control air source; the second air source outlet is connected to the second air source inlet; the control system is electrically connected to the double-acting air valve and the single-acting air valve The double-acting air valve and the single-acting air valve are connected to each other in series to control the opening and closing of the pneumatic valves at the inlet pipe and the discharge pipe of the liquid collecting tank, respectively. The double-acting air valve and the single-acting air valve are connected in series to control the opening and closing of the pneumatic valves at the inlet pipe and the discharge pipe, respectively, so as to effectively avoid the situation where the upper and lower valves of the liquid collecting tank are opened at the same time.

[0095] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0096] Although the optional embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications that fall within the scope of the present application.

[0097] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0098] The technical solution provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. At the same time, for those skilled in the art, according to the principles and implementation methods of the present application, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A sewage discharge device, characterized in that: It includes a first pneumatic valve, a second pneumatic valve, a liquid collecting tank, a double-acting air valve, a single-acting air valve and a control system; The liquid collecting tank is connected to the bottom of the gas-water separator through a liquid inlet pipe; The first pneumatic valve is arranged at the liquid inlet pipe, and the second pneumatic valve is arranged at the liquid discharge pipe of the liquid collecting tank; The double-acting gas valve at least includes a first gas source inlet, a first gas source outlet and a second gas source outlet, and the single-acting gas valve at least includes a second gas source inlet and a third gas source outlet; The gas source inlet of one of the first pneumatic valve and the second pneumatic valve is communicated with the first gas source outlet, and the gas source inlet of the other of the first pneumatic valve and the second pneumatic valve is communicated with the third gas source outlet; The first gas source inlet is connected to the main control gas source; The second gas source outlet is in communication with the second gas source inlet; The control system is electrically connected to the double-acting air valve and the single-acting air valve, and is used to control the opening and closing of the first pneumatic valve and the second pneumatic valve through the double-acting air valve and the single-acting air valve.

2. The sewage discharge device according to claim 1, characterized in that: The gas source inlet of the first pneumatic valve is communicated with the first gas source outlet, and the gas source inlet of the second pneumatic valve is communicated with the third gas source outlet.

3. The sewage discharge device according to claim 1, characterized in that: The double-acting gas valve is a two-position five-way solenoid valve, and the single-acting gas valve is a two-position three-way solenoid valve.

4. The sewage discharge device according to claim 1, characterized in that: When the air source does not enter, the first pneumatic valve is in a closed state; When the air source does not enter, the second pneumatic valve is in a closed state.

5. The sewage discharge device according to claim 1, characterized in that: When the double-acting gas valve is powered off, the first gas source inlet is connected to the second gas source outlet; When the double-acting gas valve is powered on, the first gas source inlet and the first gas source outlet in the double-acting gas valve are connected.

6. The sewage discharge device according to claim 1, characterized in that: When the single-acting gas valve is powered off, the second gas source inlet and the third gas source outlet are not conducting; When the single-acting gas valve is powered on, the second gas source inlet is connected to the third gas source outlet.

7. The sewage discharge device according to claim 1, characterized in that: The first pneumatic valve and the double-acting air valve are both provided in plurality, the front end of the liquid collecting tank is respectively connected to the bottom pipelines of the plurality of gas-water separators, and one first pneumatic valve is provided between each gas-water separator and the liquid collecting tank; The air source inlet of each of the first pneumatic valves is communicated with the first air source outlet of one of the double-acting air valves, and the air source inlet of the second pneumatic valve is communicated with the third air source outlet of the single-acting air valve; The total control air source, the plurality of double-acting air valves and the single single-acting air valve are sequentially connected in series through pipelines.

8. The sewage discharge device according to claim 7, characterized in that: The plurality of double-acting air valves are connected in series in sequence through pipelines, and the first air source inlet of the double-acting air valve located in the first position is connected to the total control air source, the second air source outlet of the double-acting air valve located in the last position is connected to the second air source inlet of the single-acting air valve, and the second air source outlet of the upper double-acting air valve of two adjacent double-acting air valves is connected to the first air source inlet of the lower double-acting air valve.

9. The sewage discharge device according to claim 1, characterized in that: A liquid level sensor is provided in the liquid collecting tank, and the liquid level sensor is electrically connected to the control system and is used to provide the control system with liquid level information of the liquid collecting tank; The control system is used to adjust the gas path status of the double-acting gas valve and the single-acting gas valve according to the liquid level information to control the opening and closing of the first pneumatic valve and the second pneumatic valve.

10. A hydrogen production system, characterized in that: It comprises a gas-water separator and a sewage discharge device as claimed in any one of claims 1 to 9.

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