Gas-liquid separation system and method

Abstract

The invention discloses a gas-liquid separation system and method, and relates to the technical field of water electrolysis hydrogen production, the gas-liquid separation system comprises a gas-alkali liquid small-size separator and a gas-alkali liquid large-size separator, a cyclone inclined plate is arranged in the gas-alkali liquid small-size separator, and the cyclone inclined plate enables gas-alkali mixed liquid to rotate and flow downwards to generate centrifugal force; the centrifugal force is used for performing primary gas-liquid separation on the gas-alkali mixed liquid. Therefore, the gas-liquid mixture can be subjected to first-time gas-liquid separation through the gas-alkali liquor small-sized separator to obtain separated first alkali liquor, and the first alkali liquor is subjected to second-time gas-liquid separation through the gas-alkali liquor large-sized separator to obtain separated second alkali liquor. The gas-alkali mixed liquor can be separated twice through the small gas-alkali liquor separator and the large gas-alkali liquor separator, so that gas-liquid separation is more thorough, that is, the gas content of the second alkali liquor is greatly reduced, and therefore, when the second alkali liquor is sent to the electrolytic bath, the voltage for secondary electrolysis in the electrolytic bath can be slowly increased, and the energy consumption is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen production by electrolysis of water, and in particular to a gas-liquid separation system and method. Background Art

[0002] In the process of producing hydrogen by electrolysis of water, gas-liquid separation needs to be achieved through a large gas-alkali-liquid separator. In order to meet the production requirements of large-scale renewable energy green electricity production of green hydrogen projects for a single electrolyzer of at least 1,000-3,000 standard cubic meters per hour, and a 4,000 standard cubic meter gas-liquid separation system with four 1,000 standard cubic meter electrolyzers, or even one to five, the current solution is to increase the diameter of the large gas-alkali-liquid separator and lengthen the cylinder length of the large gas-alkali-liquid separator.

[0003] However, as the circulation flow of the gas-alkali mixture (i.e., the hydrogen-alkali mixture and the oxygen-alkali mixture) becomes larger and larger and the speed becomes faster and faster, the above-mentioned method of increasing the diameter and lengthening the cylinder cannot ensure sufficient residence time of the gas-alkali mixture, resulting in a large amount of inadequately separated gas existing in the alkali solution in the form of tiny gas nuclei, which are drawn back from the separator manifold by the alkali solution circulation pump and then sent to the electrolytic cell. The presence of more and more gas nuclei causes the electrolysis voltage of the electrolytic cell to gradually increase and the energy consumption value to increase. Summary of the invention

[0004] In view of the above problems, the present application provides a gas-liquid separation system and method to achieve the purpose of more thorough gas-liquid separation. The specific scheme is as follows:

[0005] The first aspect of the present application provides a gas-liquid separation system, comprising: a small gas-alkali-liquid separator and a large gas-alkali-liquid separator, wherein a cyclone inclined plate is arranged inside the small gas-alkali-liquid separator, and the cyclone inclined plate causes the gas-alkali mixed liquid to rotate and flow downward to generate centrifugal force, and the centrifugal force is used to perform a first gas-liquid separation on the gas-alkali mixed liquid;

[0006] The gas-alkali-liquid small separator is used to perform the first gas-liquid separation on the gas-liquid mixture to obtain a separated first alkali liquid;

[0007] The large gas-alkali liquid separator is used to perform a second gas-liquid separation on the first alkali liquid to obtain a separated second alkali liquid.

[0008] In a possible implementation, the gas-liquid separation system further includes: an alkali liquid bus and a gas-alkali liquid bus;

[0009] The small-sized gas-alkali-liquid separator comprises a first liquid inlet, a first gas outlet and a first liquid discharge outlet, and the large-sized gas-alkali-liquid separator comprises a second liquid inlet, a second gas outlet and a second liquid discharge outlet;

[0010] The gas-alkali-liquid bus is used to allow the gas-alkali mixed liquid in the electrolytic cell to enter the gas-alkali-liquid small separator through the first liquid inlet;

[0011] The first liquid discharge port is used to discharge the first alkali solution into the alkali solution bus;

[0012] The first gas outlet is used to discharge the first gas separated by the gas-alkali liquid small separator;

[0013] The second liquid inlet is used to allow the first alkali liquid in the alkali liquid bus to enter the large gas-alkali liquid separator;

[0014] The second liquid discharge port is used to discharge the second alkali solution;

[0015] The second gas outlet is used to discharge the second gas separated by the large gas-alkali-liquid separator.

[0016] In a possible implementation, the cyclone inclined plate is arranged at a lower position inside the gas-alkali-liquid small separator;

[0017] A drip-catching net is provided at a position slightly above the inner center of the small gas-alkali-liquid separator and below the first gas outlet, and the drip-catching net is used to remove moisture from the first gas.

[0018] In a possible implementation, a pneumatic ball valve is provided before the first liquid inlet and / or after the first liquid outlet.

[0019] In a possible implementation, a baffle is disposed inside the large gas-alkali-liquid separator, and the baffle is used to increase the flow distance of the first alkali liquid in the large gas-alkali-liquid separator.

[0020] In a possible implementation, the gas-liquid separation system further includes: a gas bus, a gas scrubber, a gas cooler and a gas-water separator;

[0021] The gas bus is used to allow the first gas to enter the gas scrubber;

[0022] The gas scrubber is used to wash away the alkali solution in the first gas and the second gas to obtain an initial de-alkali gas;

[0023] The gas cooler is used to cool the initial de-alkali gas to obtain a reduced-temperature gas;

[0024] The gas-water separator is used to perform a third gas-liquid separation on the cooled gas to obtain separated dry gas.

[0025] In a possible implementation, the large gas-alkali-liquid separator further includes: a condensed water return port;

[0026] The condensed water reflux port is used to recycle the condensed water in the gas cooler into the large gas-alkali liquid separator.

[0027] In a possible implementation, the large gas-alkali-liquid separator further includes: an overflow port;

[0028] The overflow port is used to recover the trace alkali solution washed away by the gas scrubber and the supplementary water consumed in electrolysis to the large gas-alkali-liquid separator.

[0029] In a possible implementation, the gas-liquid separation system is a hydrogen-alkali liquid separation system or an oxygen-alkali liquid separation system.

[0030] A second aspect of the present application provides a gas-liquid separation method, which is applied to the gas-liquid separation system as described in any one of the above items, comprising:

[0031] Using the gas-alkali-liquid small separator to perform the first gas-liquid separation on the gas-liquid mixture to obtain a separated first alkali liquid;

[0032] The large-sized gas-alkali-liquid separator is used to perform the second gas-liquid separation on the first alkali liquid to obtain a separated second alkali liquid.

[0033] By means of the above technical scheme, the gas-liquid separation system provided by the present application includes a small gas-alkali liquid separator and a large gas-alkali liquid separator, wherein a cyclone inclined plate is arranged inside the small gas-alkali liquid separator, and the cyclone inclined plate causes the gas-alkali mixed liquid to rotate and flow downward to generate centrifugal force, so as to perform a first gas-liquid separation on the gas-alkali mixed liquid by centrifugal force to obtain a separated first alkali liquid; the large gas-alkali liquid separator is used to perform a second gas-liquid separation on the first alkali liquid to obtain a separated second alkali liquid. It can be seen that the present application can perform two separations of the gas-alkali mixed liquid by means of a small gas-alkali liquid separator and a large gas-alkali liquid separator, and compared with the prior art method of using only a large gas-alkali liquid separator for separation, the present application can perform a more thorough gas-liquid separation on the gas-alkali mixed liquid, and the gas content of the second alkali liquid separated from the large gas-alkali liquid separator is greatly reduced, and the second alkali liquid is sent to the electrolytic cell, so that the voltage of the electrolysis inside the electrolytic cell increases slowly again, thereby reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0035] Figure 1 A schematic diagram of the structure of a gas-liquid separation system provided in this application;

[0036] Figure 2 A schematic diagram of the structure of a small gas-alkali-liquid separator provided in this application;

[0037] Figure 3 A schematic diagram of the structure of another gas-liquid separation system provided in this application;

[0038] Figure 4 A schematic diagram of the structure of another gas-liquid separation system provided in this application;

[0039] Figure 5 A schematic diagram of the structure of another gas-liquid separation system provided in this application;

[0040] Figure 6 A schematic diagram of the internal structure of the gas-alkali-liquid small separator provided in the present application at a first angle;

[0041] Figure 7 A schematic diagram of the internal structure of the gas-alkali-liquid small separator provided in the present application at a second angle;

[0042] Figure 8 A schematic diagram of the gas-alkali mixed liquid rotating in a gas-alkali-liquid small separator provided in the present application;

[0043] Fig. 9 A schematic diagram of the structure of a large gas-alkali-liquid separator provided in this application;

[0044] Fig.10 A schematic diagram of the structure of another gas-liquid separation system provided in this application;

[0045] Fig.11 A schematic diagram of the structure of another gas-liquid separation system provided in this application;

[0046] Fig.12 A schematic diagram of the combined structure of a hydrogen-alkali liquid separation system and an oxygen-alkali liquid separation system provided in the present application;

[0047] Fig.13 A schematic flow chart of a gas-liquid separation method provided in this application. DETAILED DESCRIPTION

[0048] The following describes the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. The terms used in the implementation method section of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0049] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0050] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is only to describe the distinction mode adopted by the objects of the same attributes when describing in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0051] See also Figure 1 , is a schematic diagram of the structure of a gas-liquid separation system provided in this application. Figure 1 As shown, the gas-liquid separation system 10 includes a small gas-alkali-liquid separator 100 and a large gas-alkali-liquid separator 200 .

[0052] See also Figure 2 , is a schematic diagram of the structure of a small gas-alkali-liquid separator provided in this application. Figure 2 As shown, a cyclone inclined plate 101 is provided inside the small-sized gas-alkali-liquid separator 100. After the gas-alkali mixed liquid enters the small-sized gas-alkali-liquid separator 100, it will rotate and flow downward under the action of the cyclone inclined plate 101, thereby generating a rotating centrifugal force. The centrifugal force enables the gas-alkali mixed liquid to achieve the first gas-liquid separation and obtain the separated first alkali liquid.

[0053] That is, in this embodiment, the small gas-alkali-liquid separator 100 is used to perform a first gas-liquid separation on the gas-liquid mixture to obtain a separated first alkali liquid.

[0054] The large gas-alkali liquid separator 200 is used to perform a second gas-liquid separation on the first alkali liquid to obtain a separated second alkali liquid.

[0055] The second alkali solution can eventually be sent to the electrolytic cell for subsequent circulation.

[0056] It can be seen that the present application can separate the gas-alkali mixed liquid twice through the small gas-alkali-liquid separator and the large gas-alkali-liquid separator. Compared with the prior art method of using only the large gas-alkali-liquid separator for separation, the present application can perform more thorough gas-liquid separation on the gas-alkali mixed liquid, and the gas content of the second alkali liquid separated from the large gas-alkali-liquid separator is greatly reduced. The second alkali liquid is sent to the electrolytic cell, so that the voltage of the electrolysis inside the electrolytic cell increases slowly, thereby reducing energy consumption.

[0057] like Figure 3 , is a schematic diagram of the structure of another gas-liquid separation system provided in this application. Figure 3As shown, the gas-liquid separation system 10 further includes a gas-alkali liquid bus 300 and an alkali liquid bus 400 .

[0058] In this embodiment, the small gas-alkali-liquid separator 100 may further include a first liquid inlet, a first gas outlet and a first liquid discharge port, and the large gas-alkali-liquid separator may further include a second liquid inlet, a second gas outlet and a second liquid discharge port.

[0059] The gas-alkali-liquid bus 300 is used to allow the gas-alkali mixed liquid in the electrolytic cell to enter the gas-alkali-liquid small separator 100 through the first liquid inlet.

[0060] The first liquid discharge port is used to discharge the first alkali liquid separated by the gas-alkali liquid small separator 100 into the alkali liquid bus 400 .

[0061] The first gas outlet is used to discharge the first gas separated by the small gas-alkali liquid separator 100.

[0062] The second liquid inlet is used to allow the first alkali liquid in the alkali liquid bus 400 to enter the large gas-alkali liquid separator 200.

[0063] The second liquid discharge port is used to discharge the second alkali liquid separated by the large gas-alkali liquid separator 200.

[0064] The second gas outlet is used to discharge the second gas separated by the large gas-alkali liquid separator 200.

[0065] It should be noted that the above-mentioned gas-alkali-liquid bus 300 and alkali-liquid bus 400 can both manage and distribute liquids. In actual application scenarios, the gas-alkali-liquid bus 300 can have a variety of structures, and the specific structure is related to the processing capacity of the gas-liquid separation system 10. Correspondingly, there can also be one or more gas-alkali-liquid small separators 100. For example, in some scenarios, in order to adapt to the processing capacity of the gas-liquid separation system 10 and the structure of the gas-alkali-liquid bus 300, the gas-liquid separation system 10 can include 4 gas-alkali-liquid small separators 100, and the structure and connection relationship of each gas-alkali-liquid small separator 100 are the same, which will not be repeated here.

[0066] In the above structure, the first gas is separated by the small gas-alkali liquid separator 100, and the second gas is separated by the large gas-alkali liquid separator. The first gas and the second gas may contain trace amounts of alkali liquid. In order to extract drier gas, this embodiment can further process the first gas and the second gas.

[0067] See also Figure 4 , is a structural schematic diagram of another gas-liquid separation system provided in this application. Figure 4As shown, the gas-liquid separation system 10 may further include a gas bus 500 , a gas scrubber 600 , a gas cooler 700 and a gas-water separator 800 .

[0068] The gas bus 500 is used to allow the first gas separated by the gas-alkali liquid small separator 100 to enter the gas scrubber 600.

[0069] The gas scrubber 600 is used to wash away trace amounts of alkali solution in the first gas and the second gas to obtain an initial de-alkali gas.

[0070] The gas cooler 700 is used to cool the initial de-alkali gas to obtain a cooled gas.

[0071] It should be noted that when cooling the initial de-alkali gas, the gas cooler 700 can not only cool the gas in the initial de-alkali gas to obtain cooled gas, but also cool the water carried by the initial de-alkali gas to obtain condensed water, thereby achieving gas-liquid separation of the initial de-alkali gas.

[0072] The gas-water separator 800 is used to perform a third gas-liquid separation on the cooled gas to obtain separated dry gas.

[0073] Optional, see Figure 5 , is a structural schematic diagram of another gas-liquid separation system provided in this application. Figure 5 As shown, the gas-liquid separation system 10 may further include a gas drainer 900 and a condensate recovery device 1000 .

[0074] The gas drainer 900 is used to receive the condensed water separated by the gas-water separator 800 (the condensed water may contain trace alkali, hereinafter referred to as condensed water with trace alkali), and then send it to the condensate recovery device 100 for recovery.

[0075] In summary, the embodiments of the present application can achieve more thorough gas-liquid separation through multiple gas-liquid separation treatments. On the one hand, it can improve the purity of the electrolytic gas, and on the other hand, it can reduce the safety hazards caused by the purity dropping to the explosion limit during the electrolysis process and save electricity.

[0076] In order to enable those skilled in the art to better understand the small-sized gas-alkali-liquid separator 100 and the large-sized gas-alkali-liquid separator 200 provided in the present application, the small-sized gas-alkali-liquid separator 100 and the large-sized gas-alkali-liquid separator 200 are introduced in more detail below in combination with more drawings.

[0077] See also Figure 6 , is a schematic diagram of the internal structure of the gas-alkali-liquid small separator provided in the present application at a first angle. Here, the first angle and the second angle below are both angles of viewing the gas-alkali-liquid small separator from the side, and the first angle is different from the second angle below.

[0078] like Figure 6 The shell of the small gas-alkali liquid separator 100 is composed of an upper head 102, a lower head 103 and an intermediate cylinder 104, and a cyclone inclined plate 101 is arranged inside.

[0079] Optional, such as Figure 6 The cyclone inclined plate 101 can be set at a lower center position inside the small gas-alkali liquid separator 100.

[0080] Optionally, a dripping net 105 is further provided at an upper center position of the gas-alkali-liquid small separator 100 , and the dripping net 105 is used to remove the alkali liquid in the first gas separated by the gas-alkali-liquid small separator 100 .

[0081] In this embodiment, the gas-alkali-liquid small separator 100 is provided with a first liquid inlet 107, a first gas outlet 106 and a first liquid discharge port 108. In order to facilitate the discharge of the first gas separated by the gas-alkali-liquid small separator 100, the first gas outlet 106 is optionally arranged above the dripping net 105, for example Figure 6 As shown, the first gas outlet 106 is disposed on the upper cover 102 to facilitate the discharge of the first gas.

[0082] In order to adapt to the cyclone inclined plate 101, the first liquid inlet 107 can be optionally arranged at a position slightly below and slightly to the left or slightly to the right of the center of the gas-alkali liquid small separator 100, for example, see Figure 7 , is a schematic diagram of the internal structure of the gas-alkali-liquid small separator provided in the present application at a second angle, the first liquid inlet 107 is arranged at a left position, so that the gas-alkali mixed liquid can flow downward along the cyclone inclined plate 101 after entering the gas-alkali-liquid small separator 100 from the first liquid inlet 107, and the schematic diagram of the gas-alkali mixed liquid rotating in the gas-alkali-liquid small separator is as shown in Figure 8 shown.

[0083] It should be noted that Figure 8 The rotation direction shown is only an example and is not intended to limit the present application.

[0084] In this embodiment, after the gas-alkali mixed liquid enters the gas-alkali-liquid small separator 100 from the first liquid inlet 107, it rotates downward along the cyclone inclined plate 101 to generate a rotating centrifugal force, and gas-liquid separation is performed under the action of the centrifugal force to obtain the separated first gas and the first alkali liquid. The first gas moves upward along the bottom of the intermediate cylinder 104 and is discharged from the first gas outlet 106 through the dripping net 105, and the first alkali liquid is discharged from the bottom through the first liquid discharge port 108.

[0085] Optionally, the small-sized gas-alkali-liquid separator 100 is further provided with a liquid level gauge port 109 , and the liquid level gauge port 109 is provided with a liquid level meter for measuring the liquid level inside the small-sized gas-alkali-liquid separator 100 .

[0086] Optionally, a pneumatic ball valve may be provided before the first liquid inlet 107 and / or after the first liquid outlet 108 to regulate the real-time gas-liquid processing volume in the gas-alkali liquid small separator 100 through the pneumatic ball valve.

[0087] For example, the liquid level inside the small gas-alkali-liquid separator 100 can be measured by a liquid level gauge arranged on the liquid level gauge port 109, and based on the measured liquid level and the demand for real-time gas-liquid processing volume, the real-time gas-liquid processing volume in the small gas-alkali-liquid separator 100 can be regulated by a pneumatic ball valve arranged in front of the first liquid inlet 107 and / or a pneumatic ball valve arranged behind the first liquid discharge port 108 to meet the demand.

[0088] In summary, this embodiment can ensure that the small gas-alkali-liquid separator 100 can more effectively separate the first gas and the first alkali liquid through the cyclone inclined plate 101, the dripping net 105 and the pneumatic ball valve and other structures arranged inside the small gas-alkali-liquid separator 100.

[0089] See also Fig. 9 , which is a schematic diagram of the structure of a large-sized gas-alkali liquid separator provided in this application.

[0090] The outer shell of the large-sized gas-alkali-liquid separator 200 is composed of a left end cover 201 , a right end cover 202 and a middle cylinder 203 .

[0091] like Fig. 9 The large gas-alkali-liquid separator 200 is provided with a second liquid inlet 204, a second gas outlet 205 and a second liquid discharge port 206, so that after the first alkali liquid enters the large gas-alkali-liquid separator 200 from the second liquid inlet 204, a second gas-liquid separation is performed in the large gas-alkali-liquid separator 200, and the separated second alkali liquid is discharged from the second liquid discharge port 206, and the separated second gas is discharged from the second gas outlet 205.

[0092] Optionally, a baffle 207 may be provided inside the large gas-alkali-liquid separator 200 to increase the flow distance of the first alkali liquid in the large gas-alkali-liquid separator 200 through the baffle 207 and increase the duration of gas-liquid separation so as to perform gas-liquid separation more thoroughly.

[0093] It should be noted that in Fig. 9 In the large gas-alkali-liquid separator 200 shown in the figure, a plurality of baffles 207 having the same structure but different positions are provided. However, due to the large number of baffles 207, the baffles 207 are not shown in the figure. Fig. 9 All baffles 207 are labeled.

[0094] Optionally, a condensate reflux port 208 may be further provided on the large gas-alkali-liquid separator 200 , and the condensate reflux port 208 is used to recycle the condensate in the gas cooler 700 into the large gas-alkali-liquid separator 200 .

[0095] See also Fig.10 , which is a structural schematic diagram of another gas-liquid separation system provided in this application.

[0096] like Fig.10 The gas cooler 700 cools the initial de-alkali gas so that condensed water can be separated from the initial de-alkali gas, and the remaining cooled gas is sent to the gas-water separator 800 for the third gas-liquid separation, and the condensed water can be recovered into the large gas-alkali-liquid separator 200 through the condensed water reflux port 208.

[0097] Optionally, an overflow port 209 may be provided on the large gas-alkali liquid separator 200, and the overflow port 209 is used to recycle the trace alkali liquid washed away by the gas scrubber 600 and the electrolysis consumption supplementary water into the large gas-alkali liquid separator 200. Here, the electrolysis consumption supplementary water refers to the water supplemented in the gas scrubber 600 from the outside. Here, the electrolysis consumption supplementary water refers to the water supplemented in the gas scrubber 600 from the outside.

[0098] See also Fig.11 , which is a structural schematic diagram of another gas-liquid separation system provided in this application.

[0099] like Fig.11 The gas scrubber 600 can wash away the trace alkali liquid in the first gas and the second gas to obtain the initial de-alkali gas, and send the initial de-alkali gas to the gas cooler 700 for gas cooling. The trace alkali liquid washed away by the gas scrubber 600 and the supplementary water consumed by electrolysis can be recovered into the large gas-alkali liquid separator 200 through the overflow port 209.

[0100] Optional, such as Fig. 9 A liquid level gauge port 210 may also be provided on the large gas-alkali-liquid separator 200 , and a liquid level meter may be provided on the liquid level gauge port 210 to measure the liquid level inside the large gas-alkali-liquid separator 200 .

[0101] Optional, such as Fig. 9 A balance port 211 may also be provided on the large gas-alkali-liquid separator 200. When a plurality of gas-liquid separation systems 10 exist at the same time, the balance port 211 may be used to ensure that the liquid levels of the plurality of gas-liquid separation systems 10 are connected, thereby facilitating adjustment of the liquid level and ensuring that the liquid level remains level.

[0102] In summary, the present application ensures that the large gas-alkali-liquid separator 200 can perform gas-liquid separation as thoroughly as possible through the baffle 207 and the like set inside the large gas-alkali-liquid separator 200, thereby improving the efficiency of gas-liquid separation.

[0103] In a possible implementation, the gas-liquid separation system 10 may be a hydrogen-alkali liquid separation system or an oxygen-alkali liquid separation system.

[0104] For the hydrogen-alkali liquid separation system, the above-mentioned small gas-alkali liquid separator 100, large gas-alkali liquid separator 200, gas-alkali liquid bus 300, gas bus 500, gas scrubber 600, gas cooler 700, gas-water separator 800, gas drainer 900 and condensate recovery device 100 can be respectively: small hydrogen-alkali liquid separator, hydrogen separator, hydrogen-alkali liquid bus, hydrogen bus, hydrogen scrubber, hydrogen cooler, hydrogen-water separator, hydrogen drainer and hydrogen side condensate recovery device.

[0105] For the oxygen-alkali liquid separation system, the above-mentioned small gas-alkali liquid separator 100, large gas-alkali liquid separator 200, gas-alkali liquid bus 300, gas bus 500, gas scrubber 600, gas cooler 700, gas-water separator 800, gas drainer 900 and condensate recovery device 100 can be respectively: small oxygen-alkali liquid separator, oxygen separator, oxygen-alkali liquid bus, oxygen bus, oxygen scrubber, oxygen cooler, oxygen-water separator, oxygen drainer and alkali preparation inlet pipe.

[0106] Then, see Fig.12 , which is a schematic diagram of the combined structure of a hydrogen alkali liquid separation system and an oxygen alkali liquid separation system provided in this application.

[0107] like Fig.12 The hydrogen alkali liquid separation system 10 and the oxygen alkali liquid separation system 10 are connected through the respective balance ports of the hydrogen separator 200 and the oxygen separator 200 to achieve liquid level balance between the two systems.

[0108] In view of the problem of incomplete gas-liquid separation at present, this embodiment can collect multiple gas-liquid separations to achieve complete gas-liquid separation. Fig.12 The hydrogen-alkali mixed solution from the electrolytic cell is distributed to x1 groups of hydrogen-alkali solution small separators 100 through the hydrogen-alkali solution bus 300 (x1 is the number of hydrogen-alkali solution small separators 100, Fig.12In the example, x1=1), the hydrogen-alkali mixed liquid is subjected to the first gas-liquid separation in the x1 group hydrogen-alkali liquid small separator 100, and the separated first hydrogen enters the hydrogen bus 500 and then enters the hydrogen scrubber 600 to wash away the trace alkali liquid brought by the first hydrogen. A large amount of the first alkali liquid separated by the hydrogen-alkali liquid small separator 100 enters the alkali liquid bus 400 and then enters the hydrogen separator 200 for the second gas-liquid separation, and the separated second alkali liquid goes to the circulation pump and then enters the electrolyzer. The second hydrogen separated by the hydrogen scrubber 600 also enters the hydrogen scrubber 600 to wash away the trace alkali liquid brought by the second hydrogen. The trace alkali liquid brought by the first hydrogen and the second hydrogen are both recovered to the hydrogen separator 200. At the same time, the first hydrogen and the second hydrogen are washed away with trace alkali liquid and enter the hydrogen cooler 700 as the initial de-alkali hydrogen for cooling and enter the hydrogen water separator 800 for the third gas-water separation to obtain dry hydrogen (i.e., product crude hydrogen). The condensed water separated by the hydrogen-water separator 800 carries trace amounts of alkali and enters the first common system (including the hydrogen drainer 900 and the hydrogen-side condensate recovery device 1000) for unified treatment.

[0109] Similarly, the oxygen-alkali mixed solution from the electrolytic cell is distributed to x2 groups of oxygen-alkali solution small separators 100 through the oxygen-alkali solution bus 300 (x2 is the number of oxygen-alkali solution small separators 100, Fig.12 In the figure, x2=1), the oxygen-alkali mixed liquid is subjected to the first gas-liquid separation in the x2 group of oxygen-alkali liquid small separators 100, and the separated first oxygen enters the oxygen bus 500 and then enters the oxygen scrubber 600 to wash away the trace alkali liquid brought by the first oxygen. A large amount of first alkali liquid separated by the oxygen-alkali liquid small separator 100 enters the alkali liquid bus 400 and then enters the oxygen separator 200 for the second gas-liquid separation, and the separated second alkali liquid goes to the circulation pump and then enters the electrolyzer. The second oxygen separated by the oxygen scrubber 600 also enters the oxygen scrubber 600 to wash away the trace alkali liquid brought by the second oxygen, and the trace alkali liquid brought by the first oxygen and the second oxygen are both recovered to the oxygen separator 200. At the same time, the first oxygen and the second oxygen are washed away with trace alkali liquid and enter the oxygen cooler 700 as the initial de-alkali oxygen for cooling and enter the oxygen-water separator 800 for the third gas-water separation to obtain dry oxygen (i.e., product crude oxygen). The condensed water separated by the oxygen-water separator 800 carries trace amounts of alkali and enters the second public system (including the oxygen drainer 900 and the alkali inlet pipe 1000) for unified treatment.

[0110] In summary, the present application provides the entire process of gas-liquid separation during the electrolysis of water to produce crude hydrogen and crude oxygen products. Through multiple gas-liquid separations, it can be ensured that the large gas-alkali liquid separator (i.e., the oxygen separator and the hydrogen separator) separates the second alkali liquid with less gas content. The gas content of the second alkali liquid is reduced, which slows down the voltage increase during the second electrolysis in the electrolytic cell, saves electric energy, improves the purity of hydrogen and oxygen, and reduces the safety hazards caused by the purity dropping to the explosion limit during the electrolysis process.

[0111] Corresponding to the gas-liquid separation system provided above, the present application also provides a gas-liquid separation method.

[0112] The gas-liquid separation method provided in the embodiment of the present application can be applied to the gas-liquid separation system in any of the above embodiments. In order to enable those skilled in the art to better understand the gas-liquid separation method in the embodiment of the present application, it is described in detail through the following embodiments.

[0113] Reference Figure 8 , Figure 8 A schematic flow chart of a gas-liquid separation method provided in an embodiment of the present application, the method may include:

[0114] Step S11, using a small gas-alkali-liquid separator to perform a first gas-liquid separation on the gas-liquid mixture to obtain a separated first alkali liquid.

[0115] Step S12: using a large-sized gas-alkali-liquid separator to perform a second gas-liquid separation on the first alkali liquid to obtain a separated second alkali liquid.

[0116] The gas-liquid separation method provided in this application corresponds to the gas-liquid separation system provided above. For details, please refer to the above introduction and will not be repeated here.

[0117] Optionally, the present application also provides an electronic device, the hardware structure of which may include: at least one processor, at least one communication interface, at least one memory and at least one communication bus.

[0118] In an embodiment of the present application, the number of processors, communication interfaces, memories, and communication buses is at least one, and the processors, communication interfaces, and memories communicate with each other through the communication bus.

[0119] The processor may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0120] The memory may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), etc., such as at least one disk memory.

[0121] The memory stores a program, and the processor can call the program stored in the memory to implement each step in the gas-liquid separation method as described above.

[0122] Optionally, the detailed functions and extended functions of the program may refer to the above description.

[0123] An embodiment of the present application further provides a readable storage medium on which a computer program is stored. When the computer program is executed by a processor, each step in the gas-liquid separation method as described above is implemented.

[0124] Optionally, the detailed functions and extended functions of the program may refer to the above description.

[0125] Through the description of the above implementation mode, the technicians in the field can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course, it can also be implemented by special hardware including special integrated circuits, special CPUs, special memories, special components, etc. In general, all functions completed by computer programs can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be various, such as analog circuits, digital circuits or special circuits. However, for the present application, software program implementation is a better implementation mode in more cases. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer floppy disk, a U disk, a mobile hard disk, a ROM, a RAM, a disk or an optical disk, etc., including a number of instructions to enable a computer device (which can be a personal computer, a training device, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0126] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0127] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website site, a computer, a training device, or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, training device, or data center. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device, a data center, etc. that includes one or more available media integrations. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)), etc.

Claims

1. A gas-liquid separation system, characterized in that: include: A small gas-alkali-liquid separator and a large gas-alkali-liquid separator, wherein a cyclone inclined plate is arranged inside the small gas-alkali-liquid separator, and the cyclone inclined plate causes the gas-alkali mixed liquid to rotate and flow downward to generate centrifugal force, and the centrifugal force is used to perform the first gas-liquid separation on the gas-alkali mixed liquid; The gas-alkali-liquid small separator is used to perform the first gas-liquid separation on the gas-liquid mixture to obtain a separated first alkali liquid; The large gas-alkali liquid separator is used to perform a second gas-liquid separation on the first alkali liquid to obtain a separated second alkali liquid.

2. The gas-liquid separation system according to claim 1, characterized in that: The gas-liquid separation system further comprises: an alkali liquid bus and a gas-alkali liquid bus; The small-sized gas-alkali-liquid separator comprises a first liquid inlet, a first gas outlet and a first liquid discharge outlet, and the large-sized gas-alkali-liquid separator comprises a second liquid inlet, a second gas outlet and a second liquid discharge outlet; The gas-alkali-liquid bus is used to allow the gas-alkali mixed liquid in the electrolytic cell to enter the gas-alkali-liquid small separator through the first liquid inlet; The first liquid discharge port is used to discharge the first alkali solution into the alkali solution bus; The first gas outlet is used to discharge the first gas separated by the gas-alkali liquid small separator; The second liquid inlet is used to allow the first alkali liquid in the alkali liquid bus to enter the large gas-alkali liquid separator; The second liquid discharge port is used to discharge the second alkali solution; The second gas outlet is used to discharge the second gas separated by the large gas-alkali-liquid separator.

3. The gas-liquid separation system according to claim 2, characterized in that: The cyclone inclined plate is arranged at a lower position inside the center of the gas-alkali liquid small separator; A dripping net is arranged at a position slightly above the inner center of the small gas-alkali-liquid separator and below the first gas outlet, and the dripping net is used to remove the alkali liquid in the first gas.

4. The gas-liquid separation system according to claim 2, characterized in that: A pneumatic ball valve is arranged before the first liquid inlet and / or after the first liquid outlet.

5. The gas-liquid separation system according to claim 1, characterized in that: A baffle is arranged inside the large gas-alkali-liquid separator, and the baffle is used to increase the flow distance of the first alkali liquid in the large gas-alkali-liquid separator.

6. The gas-liquid separation system according to claim 2, characterized in that: The gas-liquid separation system further comprises: a gas bus, a gas scrubber, a gas cooler and a gas-water separator; The gas bus is used to allow the first gas to enter the gas scrubber; The gas scrubber is used to wash away trace amounts of alkali liquid in the first gas and the second gas to obtain an initial de-alkali gas; The gas cooler is used to cool the initial de-alkali gas to obtain a reduced-temperature gas; The gas-water separator is used to perform a third gas-liquid separation on the cooled gas to obtain separated dry gas.

7. The gas-liquid separation system according to claim 6, characterized in that: The large gas-alkali-liquid separator also includes: a condensed water return port; The condensed water reflux port is used to recycle the condensed water in the gas cooler into the large gas-alkali liquid separator.

8. The gas-liquid separation system according to claim 6, characterized in that: The large gas-alkali-liquid separator also includes: an overflow port; The overflow port is used to recover the trace alkali solution washed away by the gas scrubber and the supplementary water consumed in electrolysis into the large gas-alkali-liquid separator.

9. The gas-liquid separation system according to claim 1, characterized in that: The gas-liquid separation system is a hydrogen-alkali liquid separation system or an oxygen-alkali liquid separation system.

10. A gas-liquid separation method, applied to the gas-liquid separation system according to any one of claims 1 to 9, comprising: Using the gas-alkali-liquid small separator to perform the first gas-liquid separation on the gas-liquid mixture to obtain a separated first alkali liquid; The large-sized gas-alkali-liquid separator is used to perform the second gas-liquid separation on the first alkali liquid to obtain a separated second alkali liquid.

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