Gas preparation system

Abstract

The utility model discloses a gas preparation system. The gas preparation system comprises an electrolytic cell, a purge gas storage tank, a purge gas inlet pipeline, a heating device and a purge gas outlet pipeline, the electrolytic cell is provided with a cell body purge inlet and a cell body purge outlet, the purge gas storage tank is used for storing purge gas, and the purge gas storage tank is provided with a purge gas inlet and a purge gas outlet. The purging gas inlet pipeline is connected between the purging gas outlet and the tank body purging inlet, the heating device is arranged in the purging gas inlet pipeline and used for heating the purging gas, and the purging gas outlet pipeline is connected between the tank body purging outlet and the purging gas inlet. According to the gas preparation system disclosed by the utility model, the icing condition of the electrolytic cell can be improved by introducing the heated purge gas into the electrolytic cell, and the electrolytic cell, the purge gas storage tank and the heating device are positioned in the same circulation loop, so that the purge gas can be recycled, and the utilization rate of the purge gas is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production by water electrolysis, and in particular to a gas preparation system. Background Art

[0002] In the PEM (proton exchange membrane) pure water electrolysis hydrogen production system, a mixture of oxygen and pure water produced by electrolysis can come out of the electrolyzer. After the electrolyzer is shut down in a cold environment, it is easy to freeze and cause damage to the proton exchange membrane. In the related art, there is a method of introducing a purge gas into the electrolyzer to improve the freezing condition of the electrolyzer. However, the utilization rate of the purge gas is low, resulting in waste. Utility Model Content

[0003] The utility model aims to solve at least one of the above-mentioned technical problems in the prior art to a certain extent. To this end, the utility model proposes a gas preparation system that can improve the utilization rate of the purge gas.

[0004] According to an embodiment of the utility model, a gas preparation system includes: an electrolytic cell, a purge gas storage tank, a purge air inlet pipeline, a heating device and a purge air outlet pipeline, the electrolytic cell having a cell body purge inlet and a cell body purge outlet, the purge gas storage tank being used to store purge gas, the purge gas storage tank having a purge gas inlet and a purge gas outlet, the purge air inlet pipeline being connected between the purge gas outlet and the cell body purge inlet, the heating device being arranged in the purge air inlet pipeline for heating the purge gas, and the purge air outlet pipeline being connected between the cell body purge outlet and the purge gas inlet.

[0005] According to the gas preparation system of the embodiment of the utility model, the freezing condition of the electrolytic cell can be improved by introducing heated purge gas into the electrolytic cell, and the electrolytic cell, purge gas storage tank and heating device are in the same circulation loop, so the purge gas can be recycled, thereby improving the utilization rate of the purge gas.

[0006] According to some embodiments of the present utility model, the gas preparation system further includes a control device, the heating device is electrically connected to the control device, and the control device is at least used to control the start and stop of the heating device.

[0007] According to some embodiments of the utility model, the gas preparation system also includes an in-tank temperature measuring element, which is used to detect the temperature inside the electrolytic cell and is electrically connected to the control device, and the control device is suitable for controlling the heating device to stop heating the purge gas when the temperature detected by the in-tank temperature measuring element reaches a first temperature threshold.

[0008] According to some embodiments of the utility model, the gas preparation system also includes an environmental temperature measuring element, which is used to detect the ambient temperature outside the electrolytic cell and is electrically connected to the control device, and the control device is suitable for controlling the drainage of the electrolytic cell when the temperature detected by the environmental temperature measuring element is lower than a second temperature threshold.

[0009] According to some embodiments of the utility model, the tank body purge outlet is connected to a drain pipeline, and a drain valve is provided on the drain pipeline. The control device is suitable for controlling the drain valve to open when the temperature detected by the environmental temperature measuring element is lower than a second temperature threshold, and the control device is also used to control the drain valve to close.

[0010] According to some embodiments of the present utility model, the gas preparation system further includes an adsorption drying device, and the adsorption drying device is arranged in the purge gas outlet pipeline.

[0011] According to some embodiments of the utility model, the adsorption drying device has an adsorption inlet and an adsorption outlet, a first adsorption valve is provided between the adsorption inlet and the tank purge outlet, and / or a second adsorption valve is provided between the adsorption outlet and the purge gas inlet.

[0012] According to some embodiments of the present utility model, the gas preparation system also includes a compressor, the heating device has a heating inlet, the purge air inlet pipeline includes a first pipeline section, the first pipeline section is connected between the purge gas outlet and the heating inlet, and the compressor is arranged in the first pipeline section and is electrically connected to the control device.

[0013] According to some embodiments of the utility model, a first pipeline first valve and a first pipeline second valve are provided on the first pipeline section, the first pipeline first valve is arranged between the compressor and the purge gas outlet, the first pipeline second valve is arranged between the compressor and the heating inlet, and the first pipeline first valve and the first pipeline second valve are both electrically connected to the control device.

[0014] According to some embodiments of the utility model, the heating device has a heating outlet, the purge air intake pipeline includes a second pipeline section, the second pipeline section is connected between the heating outlet and the tank purge inlet, and a second pipeline valve is provided on the second pipeline section.

[0015] According to some embodiments of the utility model, the second pipeline section includes a main section, a first branch and a second branch, the main section is connected to the heating outlet, one end of the first branch and one end of the second branch are both connected to the main section, the other end of the first branch and the other end of the second branch are both connected to the tank body purge inlet, and the second branch is provided with a cooling device.

[0016] According to some embodiments of the present invention, a filtering device is further provided on the second branch line.

[0017] According to some embodiments of the utility model, the electrolyzer has a first outlet and a second outlet, one of the first outlet and the second outlet is an oxygen outlet, and the other is a hydrogen outlet, the gas preparation system also includes: a gas-liquid separation device and a water circulation pipeline, the gas-liquid separation device has a separation device inlet, a gas separation outlet and a water separation outlet, the separation device inlet is connected to the first outlet, the gas-liquid separation device is used to separate the gas-liquid mixture injected into the gas-liquid separation device from the first outlet into gas discharged through the gas separation outlet and water discharged through the water separation outlet; the water circulation pipeline is connected between the water separation outlet and the heating inlet of the heating device, and a circulation valve for controlling the on-off of the water circulation pipeline is provided on the water circulation pipeline.

[0018] According to some embodiments of the present invention, the gas preparation system further includes a circulation pump, which is disposed in the water circulation pipeline and is used to provide power for the water flow in the water circulation pipeline.

[0019] According to some embodiments of the present invention, the heating device further has a water replenishment inlet.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a gas preparation system according to an embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of a gas preparation system according to another embodiment of the utility model.

[0023] Reference numerals:

[0024] Gas preparation system 10, electrolytic cell 1, first outlet 11, second outlet 12, tank purge inlet 13, tank purge outlet 14, drain pipeline 15, drain valve 151, gas-liquid separation device 2, separation device inlet 21, gas separation outlet 22, first gas outlet pipeline 221, water separation outlet 23, circulation pump 3, heating device 4, heating inlet 41, heating outlet 42, water replenishment inlet 43, water replenishment valve 431, water replenishment pipeline 432, heating device drain 44, heating device valve 441, cooling device 51, filtering device 52, control device 53, tank temperature measuring element 54, environmental temperature measuring element 55, purge air inlet pipeline 61, first pipeline section 6 11. the first valve 6111 of the first pipeline, the second valve 6112 of the first pipeline, the second pipeline section 612, the first branch 6121, the second branch 6122, the main section 6123, the second pipeline valve 6124, the first valve 6125 of the second pipeline, the second valve 6126 of the second pipeline, the third valve 6127 of the second pipeline, the purge outlet pipeline 62, the first adsorption valve 621, the second adsorption valve 622, the water circulation pipeline 63, the circulation valve 631, the adsorption drying device 7, the adsorption inlet 71, the adsorption outlet 72, the purge gas storage tank 8, the purge gas inlet 81, the purge gas outlet 82, the compressor 9, the compressor inlet 91 and the compressor outlet 92. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] Combine the following Figure 1-Figure 2 The gas preparation system 10 according to an embodiment of the present invention is described in detail.

[0028] Reference Figure 1-Figure 2 As shown, the gas preparation system 10 according to the embodiment of the utility model includes: an electrolytic cell 1, a purge gas storage tank 8, a purge gas inlet pipeline 61, a heating device 4 and a purge gas outlet pipeline 62.

[0029] Among them, the electrolytic cell 1 can be a PEM electrolytic cell, the electrolytic cell 1 has a cell body purge inlet 13 and a cell body purge outlet 14, the electrolytic cell 1 has an electrolytic chamber inside, the cell body purge inlet 13 and the cell body purge outlet 14 are both connected to the electrolytic chamber, the purge gas can be introduced into the electrolytic chamber through the cell body purge inlet 13, and the purge gas in the electrolytic chamber can be discharged through the cell body purge outlet 14.

[0030] The purge gas storage tank 8 is used to store the purge gas. The purge gas storage tank 8 has a purge gas inlet 81 and a purge gas outlet 82. The purge gas inlet pipeline 61 is connected between the purge gas outlet 82 and the tank body purge inlet 13. The purge gas in the purge gas storage tank 8 can enter the purge gas inlet pipeline 61 through the purge gas outlet 82, and the purge gas in the purge gas inlet pipeline 61 can enter the electrolysis chamber through the tank body purge inlet 13.

[0031] The heating device 4 is arranged in the purge air inlet pipeline 61 to heat the purge gas. The purge gas in the purge air inlet pipeline 61 is heated by the heating device 4 and then enters the electrolysis chamber through the tank purge inlet 13, thereby increasing the temperature in the electrolysis chamber and preventing ice from forming inside the electrolysis chamber.

[0032] The purge outlet pipeline 62 is connected between the tank body purge outlet 14 and the purge gas inlet 81. The purge gas in the electrolysis chamber is discharged into the purge outlet pipeline 62 through the tank body purge outlet 14, and the purge gas in the purge outlet pipeline 62 further enters the purge gas storage tank 8 through the purge gas inlet 81, thereby realizing the recycling and reuse of the purge gas, and improving the utilization rate of the purge gas. The electrolytic cell 1, the purge gas storage tank 8 and the heating device 4 are connected into a circulation loop through the purge inlet pipeline 61 and the purge outlet pipeline 62, which can effectively reduce the loss of the purge gas.

[0033] The purge gas may be an inert gas, such as nitrogen, helium, etc., so that the purge gas does not affect the electrolysis reaction in the electrolysis chamber after it is introduced into the electrolysis chamber.

[0034] According to the gas preparation system 10 of the embodiment of the utility model, the freezing condition of the electrolytic cell 1 can be improved by introducing heated purge gas into the electrolytic cell 1, and the electrolytic cell 1, the purge gas storage tank 8 and the heating device 4 are in the same circulation loop, and the purge gas can be recycled, thereby improving the utilization rate of the purge gas.

[0035] In some embodiments of the present invention, referring to Figure 1-Figure 2As shown, the gas preparation system 10 also includes a control device 53, and the heating device 4 is electrically connected to the control device 53, and the control device 53 is at least used to control the start and stop of the heating device 4. For example, when the drying and purging inside the electrolytic cell 1 reaches the set time, the control device 53 controls the heating device 4 to stop heating the purge gas. Or when the temperature inside the electrolytic cell 1 exceeds the set value, the control device 53 controls the heating device 4 to stop heating the purge gas. In some embodiments, the control device 53 can also be used to adjust the power of the heating device 4 to change the heating capacity of the heating device 4 to the purge gas.

[0036] In some embodiments of the present invention, referring to Figure 1-Figure 2 As shown, the gas preparation system 10 also includes an in-tank temperature measuring element 54, which is used to detect the temperature inside the electrolytic cell 1, and the in-tank temperature measuring element 54 is electrically connected to the control device 53, and the control device 53 is suitable for controlling the heating device 4 to stop heating the purge gas when the temperature detected by the in-tank temperature measuring element 54 reaches a first temperature threshold. When the temperature detected by the in-tank temperature measuring element 54 reaches the first temperature threshold, the electrolytic cell 1 is near the temperature of the first temperature threshold, and the electrolytic cell 1 is not easy to freeze. At this time, the control device 53 controls the heating device 4 to stop working, thereby saving energy. The in-tank temperature measuring element 54 can monitor the internal temperature of the electrolytic cell 1 in real time.

[0037] Optionally, the first temperature threshold may be set according to actual needs, for example, the first temperature threshold may be set to 30°, 45°, 60°, etc.

[0038] Optionally, the in-tank temperature measuring element 54 is a device for measuring the internal temperature of the electrolytic tank 1, such as a temperature sensor or a thermocouple.

[0039] In some embodiments of the present invention, referring to Figure 1-Figure 2 As shown, the gas preparation system 10 also includes an environmental temperature measuring element 55, which is used to detect the ambient temperature outside the electrolytic cell 1, and the environmental temperature measuring element 55 is electrically connected to the control device 53. The control device 53 is suitable for controlling the electrolytic cell 1 to drain water when the temperature detected by the environmental temperature measuring element 55 is lower than the second temperature threshold.

[0040] In some embodiments of the present invention, referring to Figure 1-Figure 2As shown, the tank body purge outlet 14 is connected to a drainage pipeline 15, and a drainage valve 151 is provided on the drainage pipeline 15. The control device 53 is suitable for controlling the drainage valve 151 to open when the temperature detected by the environmental temperature measuring element 55 is lower than the second temperature threshold, and the control device 53 is also used to control the drainage valve 151 to close. That is to say, when the temperature detected by the environmental temperature measuring element 55 is lower than the second temperature threshold, it means that the electrolytic cell 1 is prone to freezing. At this time, the control device 53 controls the drainage valve 151 to open, and the water in the electrolytic cell 1 is discharged to the outside through the drainage pipeline 15, which can prevent the water accumulated in the electrolytic cell 1 from freezing and causing damage to the proton exchange membrane. The environmental temperature measuring element 55 can monitor the ambient temperature outside the electrolytic cell 1 in real time.

[0041] Optionally, the second temperature threshold may be set according to actual requirements, for example, the second temperature threshold may be set to 0°, 5°, 10°, etc.

[0042] Optionally, the ambient temperature measuring element 55 is a device for measuring ambient temperature, such as a temperature sensor or a thermocouple.

[0043] In some embodiments of the present invention, referring to Figure 1-Figure 2 As shown, the gas preparation system 10 further includes an adsorption drying device 7, which is disposed in the purge gas outlet pipeline 62. The adsorption drying device 7 has an adsorption drying material inside, which can adsorb the moisture carried by the purge gas in the purge gas outlet pipeline 62, so that the purge gas becomes a dry gas for easy recycling and reuse.

[0044] In some embodiments of the present invention, referring to Figure 1-Figure 2 As shown, the adsorption drying device 7 has an adsorption inlet 71 and an adsorption outlet 72, a first adsorption valve 621 is provided between the adsorption inlet 71 and the tank body purge outlet 14, and / or a second adsorption valve 622 is provided between the adsorption outlet 72 and the purge gas inlet 81. The purge gas entering the purge outlet pipeline 62 from the tank body purge outlet 14 can enter the adsorption drying device 7 through the adsorption inlet 71, and after being adsorbed and dried in the adsorption drying device 7, it flows to the purge gas storage tank 8 through the adsorption outlet 72.

[0045] exist Figure 1-Figure 2 In the embodiment of the present invention, a first adsorption valve 621 is provided between the adsorption inlet 71 and the tank body purge outlet 14, and a second adsorption valve 622 is provided between the adsorption outlet 72 and the purge gas inlet 81. In some embodiments not shown in the figure, the first adsorption valve 621 may be provided between the adsorption inlet 71 and the tank body purge outlet 14, while the second adsorption valve 622 may not be provided between the adsorption outlet 72 and the purge gas inlet 81. Alternatively, the second adsorption valve 622 may be provided only between the adsorption outlet 72 and the purge gas inlet 81, while the first adsorption valve 621 may not be provided between the adsorption inlet 71 and the tank body purge outlet 14.

[0046] Optionally, the first adsorption valve 621 may be a manual switch valve or a valve electrically connected to the control device 53. When the first adsorption valve 621 is opened, the adsorption inlet 71 can be connected to the tank purge outlet 14; when the first adsorption valve 621 is closed, the adsorption inlet 71 can be isolated from the tank purge outlet 14.

[0047] Similarly, the second adsorption valve 622 can be a manual switch valve or a valve electrically connected to the control device 53. When the second adsorption valve 622 is opened, the adsorption outlet 72 can be connected to the purge gas inlet 81; when the second adsorption valve 622 is closed, the adsorption outlet 72 can be isolated from the purge gas inlet 81.

[0048] In some embodiments of the present invention, referring to Figure 1-Figure 2 As shown, the gas preparation system 10 further includes a compressor 9, the heating device 4 has a heating inlet 41, the purge inlet pipeline 61 includes a first pipeline section 611, the first pipeline section 611 is connected between the purge gas outlet 82 and the heating inlet 41, the compressor 9 is arranged in the first pipeline section 611, and the compressor 9 is electrically connected to the control device 53. The compressor 9 can compress the purge gas in the first pipeline section 611.

[0049] Similarly, the compressor 9 has a compressor inlet 91 and a compressor outlet 92 . The purge gas from the purge gas outlet 82 enters the compressor 9 through the compressor inlet 91 , and enters the heating device 4 through the compressor outlet 92 and the heating inlet 41 .

[0050] In some embodiments of the present invention, referring to Figure 1-Figure 2 As shown, the first pipeline section 611 is provided with a first pipeline first valve 6111 and a first pipeline second valve 6112. The first pipeline first valve 6111 is arranged between the compressor 9 and the purge gas outlet 82, and the first pipeline second valve 6112 is arranged between the compressor 9 and the heating inlet 41. The first pipeline first valve 6111 and the first pipeline second valve 6112 are both electrically connected to the control device 53.

[0051] Similarly, when the first valve 6111 of the first pipeline is opened, the compressor inlet 91 can be connected to the purge gas outlet 82; when the first valve 6111 of the first pipeline is closed, the compressor inlet 91 can be isolated from the purge gas outlet 82. When the second valve 6112 of the first pipeline is opened, the compressor outlet 92 can be connected to the heating inlet 41; when the second valve 6112 of the first pipeline is closed, the compressor outlet 92 can be isolated from the heating inlet 41.

[0052] In some embodiments of the present invention, referring to Figure 1-Figure 2As shown, the heating device 4 has a heating outlet 42 , and the purge air inlet pipeline 61 includes a second pipeline section 612 , which is connected between the heating outlet 42 and the tank purge inlet 13 , and a second pipeline valve 6124 is provided on the second pipeline section 612 .

[0053] exist Figure 1 In the example shown, when the second pipeline valve 6124 is opened, the heating outlet 42 can be connected to the tank body purge inlet 13; when the second pipeline valve 6124 is closed, the heating outlet 42 can be isolated from the tank body purge inlet 13.

[0054] Optionally, the second pipeline valve 6124 may be a manual switch valve, or a valve electrically connected to the control device 53 .

[0055] In some embodiments of the present invention, referring to Figure 2 As shown, the second pipeline section 612 includes a main section 6123, a first branch 6121 and a second branch 6122, the main section 6123 is connected to the heating outlet 42, one end of the first branch 6121 and one end of the second branch 6122 are both connected to the main section 6123, the other end of the first branch 6121 and the other end of the second branch 6122 are both connected to the tank purge inlet 13, and a cooling device 51 is provided on the second branch 6122. The cooling device 51 is used to cool the medium (such as water) in the second branch 6122.

[0056] In some embodiments of the present invention, referring to Figure 2 As shown, a filter device 52 is also provided on the second branch 6122. The filter device 52 is used to filter the medium (such as water) in the second branch 6122.

[0057] In some embodiments of the present invention, referring to Figure 2 As shown, the second pipeline valve 6124 includes a second pipeline first valve 6125, and the second pipeline first valve 6125 is set on the first branch 6121. When the second pipeline first valve 6125 is opened, the main section 6123 is connected with the first branch 6121; when the second pipeline first valve 6125 is closed, the main section 6123 is not connected with the first branch 6121.

[0058] In some embodiments of the present invention, referring to Figure 2As shown, the second pipeline valve 6124 includes a second pipeline second valve 6126, which is arranged on the second branch 6122. When the second pipeline second valve 6126 is opened, the main section 6123 is connected to the second branch 6122; when the second pipeline second valve 6126 is closed, the main section 6123 is not connected to the second branch 6122. The second pipeline second valve 6126 is arranged between the cooling device 51 and the heating device 4.

[0059] In some embodiments of the present invention, referring to Figure 2 As shown, the second pipeline valve 6124 includes a second pipeline third valve 6127, which is arranged on the second branch 6122, between the filtering device 52 and the electrolytic cell 1, and can be opened or closed.

[0060] In some embodiments of the present invention, referring to Figure 2 As shown, the electrolyzer 1 has a first outlet 11 and a second outlet 12, one of the first outlet 11 and the second outlet 12 is an oxygen outlet, and the other is a hydrogen outlet. In some embodiments, the first outlet 11 is a hydrogen outlet, and the second outlet 12 is an oxygen outlet. Figure 2 In the example shown, the first outlet 11 is an oxygen outlet, and the second outlet 12 is a hydrogen outlet. The first outlet 11 discharges a mixture of oxygen and water. For the convenience of description below, the first outlet 11 is an oxygen outlet and the second outlet 12 is a hydrogen outlet.

[0061] The gas preparation system 10 further includes a gas-liquid separation device 2 and a water circulation pipeline 63. The gas-liquid separation device 2 has a separation device inlet 21, a gas separation outlet 22 and a water separation outlet 23. The separation device inlet 21 is connected to the first outlet 11. The gas-liquid separation device 2 is used to separate the gas-liquid mixture injected into the gas-liquid separation device 2 from the first outlet 11 into gas discharged through the gas separation outlet 22 and water discharged through the water separation outlet 23. The water circulation pipeline 63 is connected between the water separation outlet 23 and the heating inlet 41 of the heating device 4. The water circulation pipeline 63 is provided with a circulation valve 631 for controlling the on-off of the water circulation pipeline 63. The water discharged through the water separation outlet 23 can enter the heating device 4 through the heating inlet 41 for heating. At this time, the second valve 6126 of the second pipeline is opened, and the heated water further enters the main section 6123 through the heating outlet 42, and then enters the second branch 6122 from the main section 6123. In the second branch 6122, it is cooled by the cooling device 51 and filtered by the filtering device 52, and then enters the electrolytic cell 1 through the cell body purge inlet 13.

[0062] Optionally, the gas separation outlet 22 is located above the water separation outlet 23. For example, the gas-liquid separation device 2 has a gas-liquid separation cavity, the gas separation outlet 22 is located at the top of the gas-liquid separation cavity, and the water separation outlet 23 is located at the bottom of the gas-liquid separation cavity. When the first outlet 11 is an oxygen outlet and the second outlet 12 is a hydrogen outlet, the gas-liquid mixture injected into the gas-liquid separation device 2 from the first outlet 11 is a mixture of oxygen and water. When the gas-liquid mixture enters the gas-liquid separation cavity, the density of water is greater than that of oxygen. Water reaches the bottom of the gas-liquid separation cavity and can be discharged through the water separation outlet 23 at the bottom of the gas-liquid separation cavity. Oxygen reaches the top of the gas-liquid separation cavity and can be discharged through the gas separation outlet 22 at the top of the gas-liquid separation cavity. The gas separation outlet 22 can be connected to the first gas outlet pipeline 221, and the first gas outlet pipeline 221 can be further connected to the first gas storage tank to store the first gas. A first gas valve can be provided on the first gas outlet pipeline 221, and the first gas valve is used to adjust the opening and disconnection of the first gas outlet pipeline 221.

[0063] The second outlet 12 may be connected to a second separation device, which may be connected to a second gas outlet pipeline, which may be further connected to a second gas storage tank to store the second gas. A second gas valve may be provided on the second gas outlet pipeline, which is used to adjust the opening and disconnection of the second gas outlet pipeline.

[0064] The water discharged from the water separation outlet 23 can enter the heating device 4 through the water circulation pipeline 63 and the heating inlet 41, and then enter the electrolytic cell 1 from the heating device 4, so that the water in the water circulation pipeline 63 can enter the electrolytic cell 1 again to continue to participate in the electrolysis process. In other words, by setting up the water circulation pipeline 63, the water discharged from the first outlet 11 can be recycled to avoid waste.

[0065] In some embodiments of the present invention, referring to Figure 2 As shown, the gas preparation system 10 further includes a circulation pump 3 , which is disposed in the water circulation pipeline 63 , and is used to provide power for the water in the water circulation pipeline 63 to flow.

[0066] In some embodiments of the present invention, referring to Figure 1-Figure 2 As shown, the heating device 4 also has a water replenishment inlet 43. The water replenishment inlet 43 can be connected to an external water source to replenish the heating device 4 with external water.

[0067] In some embodiments of the present invention, referring to Figure 1-Figure 2 As shown, a water replenishment valve 431 may be provided at the water replenishment inlet 43 to open or close the water replenishment inlet 43 .

[0068] In some embodiments of the present invention, referring to Figure 1-Figure 2As shown, the water replenishment inlet 43 is connected to a water replenishment pipeline 432, and a water replenishment valve 431 is arranged on the water replenishment pipeline 432. The water replenishment pipeline 432 is connected to an external water source, and the heating device 4 can be replenished with external water through the water replenishment pipeline 432.

[0069] In some embodiments of the present invention, referring to Figure 1-Figure 2 As shown, the heating device 4 has a heating device drain port 44, and a heating device valve 441 is provided at the heating device drain port 44, and the heating device valve 441 is used to open or close the heating device drain port 44. When the heating device drain port 44 is opened, the heating device 4 can drain water outward through the heating device drain port 44.

[0070] Optionally, the valve used in the present invention may be a pneumatic valve or a solenoid valve.

[0071] Refer to the following Figure 1 The working process of a gas preparation system 10 according to a specific example of the present invention is described.

[0072] After the electrolytic cell 1 is shut down, the environmental temperature measuring element 55 transmits the measured environmental temperature value to the control device 53. When it is determined that the environmental temperature is close to below 0°C, the control device 53 controls the opening of the drain valve 151 to drain the electrolytic cell 1. After the drainage is completed, the control device 53 controls the closing of the drain valve 151, opens the second pipeline valve 6124, the first adsorption valve 621, the second adsorption valve 622, and the first pipeline first valve 6111; starts the compressor 9, opens the first pipeline second valve 6112, and the nitrogen enters the heating device 4 for heating; the nitrogen heated to the set temperature (about 60°C) enters the electrolytic cell 1, dries and purges the inside of the electrolytic cell 1, and the water-containing nitrogen leaves the electrolytic cell 1 and enters the adsorption drying device 7 for dehydration, and then enters the purge gas storage tank 8 to realize the recycling of nitrogen. When the drying and purging of the inside of the electrolytic cell 1 reaches the set time or when the internal temperature of the electrolytic cell 1 measured by the temperature measuring element 54 in the cell exceeds the set value, the control device 53 controls the heating device 4 to stop heating the purge gas, and controls the compressor 9 to stop, and sequentially closes the second pipeline valve 6124, the first adsorption valve 621, the second adsorption valve 622, the first pipeline first valve 6111, and the first pipeline second valve 6112.

[0073] Refer to the following Figure 2 The working process of a gas preparation system 10 according to another specific example of the present invention is described.

[0074] When the hydrogen production or oxygen production of the gas preparation system 10 is operating normally, the heating device 4 is used to heat the pure water before the system is started. After the system is started, the oxygen-water mixture produced by the electrolysis of water in the electrolyzer 1 enters the gas-liquid separation device 2 for gas-liquid separation. The pure water replenished in the system and the pure water produced by the separation are pumped by the pure water circulation pump 3, and after flowing through the heating device 4, the cooling device 51 and the filtering device 52, they enter the electrolyzer 1 again for electrolysis.

[0075] After the electrolytic cell 1 is shut down, the environmental temperature measuring element 55 transmits the measured environmental temperature value to the control device 53. When it is determined that the environmental temperature is close to below 0°C, the control device 53 controls the opening of the heating device valve 441 and the drain valve 151 to drain the heating device 4 and the electrolytic cell 1. After the drainage is completed, the control device 53 controls the closing of the circulation valve 631, the heating device valve 441, the second valve 6126 of the second pipeline, the third valve 6127 of the second pipeline, and the drain valve 151, and opens the first valve 6125 of the second pipeline, the first adsorption valve 621, and the first valve 6111 of the first pipeline; the compressor 9 is started, the second valve 6112 of the first pipeline is opened, and the nitrogen enters the heating device 4 for heating; the nitrogen heated to the set temperature (about 60°C) enters the electrolytic cell 1, and the inside of the electrolytic cell 1 is dried and purged. After the nitrogen containing water vapor leaves the electrolytic cell 1, it enters the adsorption drying device 7 for dehydration, and then enters the purge gas storage tank 8 to realize the recycling of nitrogen. When the drying and purging of the inside of the electrolytic cell 1 reaches the set time or when the internal temperature of the electrolytic cell 1 measured by the temperature measuring element 54 in the cell exceeds the set value, the control device 53 controls the heating device 4 to stop heating the purge gas, and controls the compressor 9 to shut down, and sequentially closes the first valve 6125 of the second pipeline, the first adsorption valve 621, the first valve 6111 of the first pipeline, and the second valve 6112 of the first pipeline, and opens the circulation valve 631, the second valve 6126 of the second pipeline, and the third valve 6127 of the second pipeline.

[0076] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0077] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0079] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A gas preparation system, characterized in that: include: An electrolytic cell (1), wherein the electrolytic cell (1) has a cell body purge inlet (13) and a cell body purge outlet (14); A purge gas storage tank (8), the purge gas storage tank (8) is used to store purge gas, and the purge gas storage tank (8) has a purge gas inlet (81) and a purge gas outlet (82); a purge air inlet pipeline (61), the purge air inlet pipeline (61) being connected between the purge air outlet (82) and the tank body purge inlet (13); a heating device (4), the heating device (4) being arranged in the purge air intake pipeline (61) for heating the purge gas; and A purge gas outlet pipeline (62), wherein the purge gas outlet pipeline (62) is connected between the tank body purge outlet (14) and the purge gas inlet (81).

2. The gas preparation system according to claim 1, characterized in that: The gas preparation system further comprises a control device (53), the heating device (4) is electrically connected to the control device (53), and the control device (53) is at least used to control the start and stop of the heating device (4).

3. The gas preparation system according to claim 2, characterized in that: The gas preparation system further comprises an in-tank temperature measuring element (54), which is used to detect the temperature inside the electrolytic tank (1) and is electrically connected to the control device (53), and the control device (53) is suitable for controlling the heating device (4) to stop heating the purge gas when the temperature detected by the in-tank temperature measuring element (54) reaches a first temperature threshold.

4. The gas preparation system according to claim 2, characterized in that: The gas preparation system further comprises an environmental temperature measuring element (55), which is used to detect the ambient temperature outside the electrolytic cell (1) and is electrically connected to the control device (53), and the control device (53) is suitable for controlling the electrolytic cell (1) to drain water when the temperature detected by the environmental temperature measuring element (55) is lower than a second temperature threshold.

5. The gas preparation system according to claim 4, characterized in that: The tank body purge outlet (14) is connected to a drainage pipeline (15), and a drainage valve (151) is provided on the drainage pipeline (15). The control device (53) is suitable for controlling the drainage valve (151) to open when the temperature detected by the environmental temperature measuring element (55) is lower than a second temperature threshold value. The control device (53) is also used to control the drainage valve (151) to close.

6. The gas preparation system according to any one of claims 1 to 5, characterized in that: The gas preparation system further comprises an adsorption drying device (7), wherein the adsorption drying device (7) is arranged in the purge gas outlet pipeline (62).

7. The gas preparation system according to claim 6, characterized in that: The adsorption drying device (7) has an adsorption inlet (71) and an adsorption outlet (72), a first adsorption valve (621) is provided between the adsorption inlet (71) and the tank body purge outlet (14), and / or a second adsorption valve (622) is provided between the adsorption outlet (72) and the purge gas inlet (81).

8. The gas preparation system according to any one of claims 2 to 5, characterized in that: The gas preparation system further comprises a compressor (9), the heating device (4) has a heating inlet (41), the purge air inlet pipeline (61) comprises a first pipeline section (611), the first pipeline section (611) is connected between the purge air outlet (82) and the heating inlet (41), and the compressor (9) is arranged in the first pipeline section (611) and is electrically connected to the control device (53).

9. The gas preparation system according to claim 8, characterized in that: The first pipeline section (611) is provided with a first pipeline first valve (6111) and a first pipeline second valve (6112); the first pipeline first valve (6111) is arranged between the compressor (9) and the purge gas outlet (82); the first pipeline second valve (6112) is arranged between the compressor (9) and the heating inlet (41); and the first pipeline first valve (6111) and the first pipeline second valve (6112) are both electrically connected to the control device (53).

10. The gas preparation system according to any one of claims 1 to 5, characterized in that: The heating device (4) has a heating outlet (42), the purge air inlet pipeline (61) comprises a second pipeline section (612), the second pipeline section (612) is connected between the heating outlet (42) and the tank body purge inlet (13), and a second pipeline valve (6124) is provided on the second pipeline section (612).

11. The gas preparation system according to claim 10, characterized in that: The second pipeline section (612) comprises a main section (6123), a first branch (6121) and a second branch (6122); the main section (6123) is connected to the heating outlet (42); one end of the first branch (6121) and one end of the second branch (6122) are both connected to the main section (6123); the other end of the first branch (6121) and the other end of the second branch (6122) are both connected to the tank body purge inlet (13); and a cooling device (51) is provided on the second branch (6122).

12. The gas preparation system according to claim 11, characterized in that: The second branch (6122) is also provided with a filtering device (52).

13. The gas preparation system according to any one of claims 1 to 5, characterized in that: The electrolytic cell (1) has a first outlet (11) and a second outlet (12), one of the first outlet (11) and the second outlet (12) is an oxygen outlet, and the other is a hydrogen outlet, and the gas preparation system further comprises: A gas-liquid separation device (2), the gas-liquid separation device (2) comprising a separation device inlet (21), a gas separation outlet (22) and a water separation outlet (23), the separation device inlet (21) being in communication with the first outlet (11), the gas-liquid separation device (2) being used for separating a gas-liquid mixture injected into the gas-liquid separation device (2) from the first outlet (11) into gas discharged through the gas separation outlet (22) and water discharged through the water separation outlet (23); A water circulation pipeline (63), wherein the water circulation pipeline (63) is connected between the water separation outlet (23) and the heating inlet (41) of the heating device (4), and a circulation valve (631) for controlling the on-off of the water circulation pipeline (63) is provided on the water circulation pipeline (63).

14. The gas preparation system according to claim 13, characterized in that: The gas preparation system further comprises a circulation pump (3), wherein the circulation pump (3) is arranged in the water circulation pipeline (63) and is used to provide power for the water to flow in the water circulation pipeline (63).

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