Safe oxygen discharge system of electrolytic hydrogen production system

Abstract

The utility model provides a safe oxygen discharge system of an electrolytic hydrogen production system, and relates to the technical field of safe oxygen discharge. The system comprises a water tank, a make-up pump, a one-way valve, a circulating pump, an electrolytic bath, an oxygen water segregator, a mixer, a flowmeter, a gas flow control valve, a hydrogen water segregator, an oxygen pressure control valve and a hydrogen pressure control valve. A one-way valve is arranged between the oxygen water segregator and the make-up pump; water is supplied to the electrolytic bath through the circulating pump, and oxygen generated by electrolysis and unreacted water enter the oxygen water segregator together; and hydrogen and water generated by electrolysis enter the hydrogen water separator together. The gas flow control valve and the flow meter are arranged between the gas source and the mixer, and the flow of gas entering the mixer is accurately controlled according to the flow of generated oxygen, so that the oxygen content is reduced, and safe emission of oxygen is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to oxygen safety discharge technical field, specifically, especially, a kind of electrolytic hydrogen production system oxygen safety discharge system. BACKGROUND

[0002] Proton exchange membrane electrolytic unit includes proton exchange membrane and catalyst attached to both sides, and is configured with power supply body on both sides. Multiple electrolytic units are connected in series to form electrolytic cell, voltage is applied on both sides and water is supplied on anode side, anode water is decomposed to produce hydrogen ions, combined with electrons to form hydrogen gas on cathode side after passing through proton membrane, in this process, part of water on anode side migrates to cathode side with hydrogen ions, oxygen and remaining unreacted water are mixed and discharged from electrolytic unit.

[0003] Generally, oxygen is not collected and used as by-product, and the purity of oxygen exceeds 98% during discharge process, and fire is easily caused under high pressure; besides, when membrane electrode of electrolytic cell is damaged, hydrogen penetrates to oxygen side, so that explosion risk is increased when oxygen is discharged. INVENTION CONTENTS

[0004] According to the high oxygen concentration technical problem mentioned in the above background art, an electrolytic hydrogen production system oxygen safety discharge system is provided.The utility model discloses by blowing into compressed gas to oxygen outlet pipeline, reduce oxygen content, to ensure the safety of oxygen side exhaust.The utility model system can adjust the gas intake of compressed gas according to different oxygen production, and can adapt to different electrolysis working condition demand.

[0005] The technical means adopted by the utility model are as follows:

[0006] An electrolytic hydrogen production system oxygen safety discharge system, comprising:

[0007] Water tank, water replenishing pump, check valve, circulating pump, electrolytic cell, oxygen water separator, mixer, flowmeter, gas flow control valve, hydrogen water separator, oxygen pressure control valve and hydrogen pressure control valve;

[0008] The suction inlet of the water replenishing pump is connected with the water tank through pipeline; the outlet of the water replenishing pump is connected with the water inlet connecting port of the oxygen water separator through pipeline; the check valve is arranged between the oxygen water separator and the water replenishing pump; the suction inlet of the circulating pump is connected with the water outlet of the oxygen water separator through pipeline; the water outlet of the circulating pump is connected with the water inlet of the electrolytic cell through pipeline; the water outlet of the electrolytic cell is connected with the backwater port of the oxygen water separator through pipeline; the hydrogen outlet of the electrolytic cell is connected with the hydrogen inlet of the hydrogen water separator through pipeline; the oxygen outlet of the oxygen water separator is connected with the oxygen gas inlet pipe of the mixer through pipeline;

[0009] An input gas source is connected with the gas inlet pipe of the mixer, and a gas flow control valve and the flow meter are sequentially arranged between the input gas source and the mixer; the hydrogen outlet of the hydrogen water separator is connected with the inlet of the hydrogen pressure control valve through a pipeline; the oxygen outlet of the oxygen water separator is connected with the inlet of the oxygen pressure control valve through a pipeline; and the water outlet of the hydrogen water separator is connected with the water tank through a pipeline.

[0010] Further, the oxygen water separator outlet is provided with a wire screen I for separating reaction water and oxygen, and oxygen gas flows out after being mixed with compressed gas through the mixer, passing through the oxygen pressure control valve and being adjusted in pressure.

[0011] Further, the hydrogen water separator outlet is provided with a wire screen II for separating water vapor and hydrogen, and hydrogen gas is connected with the hydrogen pressure control valve from the top of the hydrogen water separator.

[0012] Further, the mixer comprises a shell, a center pipe, a conic shell, an oxygen gas inlet pipe, an outlet pipe, a partition plate and an inlet pipe; the oxygen gas inlet pipe and the inlet pipe are fixedly connected to the outer wall of the cylinder of the shell; the conic shell and the partition plate are fixedly connected to the inner wall of the cylinder of the shell, and the partition plate and the inner wall of the cylinder form a mixing cavity; and the center pipe passes through the partition plate and the mixing cavity.

[0013] The mixing cavity is connected with the bottom of the center pipe through the bottom opening of the conic shell, and the top of the center pipe is connected with the outlet pipe.

[0014] Further, the gas source is air or nitrogen or any gas for reducing the concentration of pure oxygen.

[0015] Further, the circulating pump makes the circulating water flow through the electrolytic cell, the oxygen water separator and the inlet of the circulating pump in sequence.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1. The utility model discloses a safety discharge technology of mixing compressed gas into the oxygen side outlet of the electrolytic cell to dilute the oxygen concentration, thereby reducing the fire risk when the oxygen side is emptied.

[0018] 2. In the design process of the new electrolytic cell, there are many uncertainties, and the hydrogen content in the oxygen exceeds the standard, which has a great explosion risk. The safety discharge technology can dilute the oxygen concentration and reduce the hydrogen concentration, thereby reducing the explosion risk when the oxygen side is emptied.

[0019] 3. The utility model arranges a flow regulating valve and a flow meter in the compressed gas pipeline, and the control system can automatically adjust the compressed gas inlet amount according to the oxygen production amount, thereby ensuring that the oxygen content is a set value.

[0020] 4. The utility model discloses a mixer is provided, through the air inlet pipe arrangement and internal structure, under the condition of not using electric energy oxygen and compressed gas are mixed. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be simply introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor under the premise of the drawings.

[0022] Figure 1 It is the safety discharge technical drawing of the electrolytic hydrogen production system of the utility model.

[0023] Figure 2 It is the oxygen and compressed gas mixer drawing of the utility model.

[0024] Figure 3 It is the oxygen inlet pipe and compressed gas inlet pipe arrangement drawing of the mixer of the utility model.

[0025] Wherein, 1 is water tank, 2 is water supplement pump, 3 is check valve, 4 is circulating pump, 5 is electrolytic cell, 6 is oxygen water separator, 7 is mixer, 71 is shell, 72 is center tube, 73 is cone shell, 74 is oxygen inlet pipe, 75 is outlet pipe, 76 is partition, 77 is inlet pipe, 78 is mixing cavity, 8 is flowmeter, 9 is gas flow control valve, 10 is hydrogen water separator, 11 is oxygen pressure control valve, 12 is hydrogen pressure control valve. DETAILED DESCRIPTION

[0026] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] In order to make the purpose, technical scheme and advantage of the embodiments of the utility model more clear, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all. The description of at least one exemplary embodiment is actually only illustrative, and is by no means any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0028] It is to be understood that the terms so far as the language goes used in this specification are only for the purpose of describing the specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used in this specification, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprising" and / or "including", when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0029] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless otherwise specifically stated. At the same time, it should be clear that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship for the convenience of description. The technology, methods and devices known to those skilled in the related art can not be discussed in detail, but in appropriate cases, the technology, methods and devices should be considered as part of the authorized description. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0030] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0031] For the purposes of the description, relative terms such as "on", "above", "atop", "upper", "lower", and the like can be used to describe one element's or feature's spatial or topographical relationship to another element or feature as illustrated in the figures. It is to be understood that the spatial or topographical terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "at or below" other elements or features would then be oriented "below" or "at or below" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The elements can be otherwise oriented (turned on an axis 90 degrees or at other orientations) and the spatial or topographical descriptions used herein interpreted accordingly.

[0032] In addition, it should be noted that the use of "first", "second", and / or other similar terms does not imply a special order or significance other than that which is expressly stated. Use of these terms is simply intended to distinguish a corresponding part from another part of an embodiment.

[0033] As shown in the figure, Figures 1-3 The utility model provides a kind of electrolytic hydrogen production system oxygen safety discharge system, comprising: water tank 1, water replenishing pump 2, check valve 3, circulating pump 4, electrolytic cell 5, oxygen water segregator 6, mixer 7, flowmeter 8, gas flow control valve 9, hydrogen water segregator 10, oxygen pressure control valve 11 and hydrogen pressure control valve 12.

[0034] In the present application, the suction inlet of water tank 1 and water replenishing pump 2 is connected by pipeline; the outlet of water replenishing pump 2 is connected with the water inlet connecting port of oxygen water segregator 6 by pipeline; check valve 3 is arranged between oxygen water segregator 6 and water replenishing pump 2; the suction inlet of circulating pump 4 is connected with the water outlet of oxygen water segregator 6 by pipeline; the water outlet of circulating pump 4 is connected with the water inlet of electrolytic cell 5 by pipeline; the water outlet of electrolytic cell 5 is connected with the backwater port of oxygen water segregator 6 by pipeline; the hydrogen outlet of electrolytic cell 5 is connected with the hydrogen inlet of hydrogen water segregator 10 by pipeline; the oxygen outlet of oxygen water segregator 6 is connected with the oxygen inlet pipe of mixer 7 by pipeline.

[0035] As preferred, the input gas source is connected with the gas inlet pipe of mixer 7; gas flow control valve 9 and flowmeter 8 are arranged between the input gas source and mixer 7 in sequence; the hydrogen outlet of hydrogen water segregator 10 is connected with the inlet of hydrogen pressure control valve 12 by pipeline; the oxygen outlet of oxygen water segregator 6 is connected with the inlet of oxygen pressure control valve 11 by pipeline; the water outlet of hydrogen water segregator 10 is connected with water tank 1 by pipeline.

[0036] As shown in the figure, Figure 1As shown, the internal circulation 4 opens the water circulation, and the circulating water will flow through the electrolytic cell 5, the oxygen separator 6 and back to the inlet of the circulating pump 4. The electrolytic cell 5 is powered, and the generated oxygen gas and the circulating water are mixed and then flow into the oxygen separator 6. After the gas-liquid separation by the internal wire mesh, the oxygen gas flows into the mixer 7 through the oxygen gas inlet pipe 74, and the compressed gas of the gas source flows through the gas flow control valve 9 and the flow meter 8 and then flows into the mixer 7 through the gas inlet pipe 77. The arrangement of the oxygen gas inlet pipe 74 and the gas inlet pipe 77 is as shown in Figure 3 As shown, the two gas streams are mixed along the cylinder rotation and then flow downward through the conical shell 73 to accelerate and then flow into the center pipe 72 and then flow out through the gas outlet pipe 75 to the oxygen pressure control valve 11 and then be discharged to the system. The generated hydrogen gas and the permeated water are mixed and then flow into the hydrogen separator 10. After the gas-liquid separation by the internal wire mesh, the hydrogen gas flows through the hydrogen pressure control valve 12 and then is discharged to the system. The hydrogen pressure control valve 12 can adjust the output pressure according to the hydrogen pressure demand of the subsequent system, and the oxygen pressure control valve 11 adjusts the oxygen pressure according to the hydrogen pressure.

[0037] Because the gas used in the implementation process is compressed air, the oxygen flow calculated according to the input current value is F 氧 , and the compressed air flow provided by the air source is F 空 , wherein the oxygen content is 21%. When F 氧 =F 空 , the two gases are fully mixed through the mixer 7, and the oxygen content of the mixed gas is 60.5%. At this time, the oxygen content can be greatly reduced. The system automatically adjusts the air inlet amount according to the oxygen production amount to ensure that the oxygen content of the mixer is constant. The compressed air flow can also be adjusted to F 空 =2 F oxygen, and at this time the oxygen content of the mixed gas is 47.3%.

[0038] In the present application, the oxygen separator 6 outlet is provided with a wire mesh I for separating the reaction water and the oxygen gas. The oxygen gas flows from the top of the oxygen separator 6, is mixed with the compressed gas through the mixer 7, and then flows out after the pressure of the mixed gas is adjusted by the oxygen pressure control valve 11. The hydrogen separator 10 outlet is provided with a wire mesh II for separating the water vapor and the hydrogen gas. The hydrogen gas is connected with the hydrogen pressure control valve 12 from the top of the hydrogen separator 10.

[0039] As a preferred embodiment, in the present application, the mixer 7 comprises a shell 71, a center pipe 72, a conical shell 73, an oxygen gas inlet pipe 74, a gas outlet pipe 75, a partition plate 76 and a gas inlet pipe 77. The oxygen gas inlet pipe 74 and the gas inlet pipe 77 are fixedly connected to the outer wall of the cylinder of the shell 71. The conical shell 73 and the partition plate 76 are fixedly connected to the inner wall of the cylinder of the shell 71, and the partition plate 76 and the inner wall of the cylinder form a mixing chamber 78. The center pipe 72 penetrates through the partition plate 76 and the mixing chamber 78. The mixing chamber 78 is connected with the bottom of the center pipe 72 through the bottom opening of the conical shell 73, and the top of the center pipe 72 is connected with the gas outlet pipe 75.

[0040] In the present application, the gas source is air or nitrogen or any gas that reduces the concentration of pure oxygen.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An oxygen safety emission system for an electrolytic hydrogen production system, characterized in that, include: Water tank (1), water supply pump (2), check valve (3), circulation pump (4), electrolytic cell (5), oxygen separator (6), mixer (7), flow meter (8), gas flow control valve (9), hydrogen separator (10), oxygen pressure control valve (11) and hydrogen pressure control valve (12); The water tank (1) is connected to the suction port of the water replenishment pump (2) via a pipe; the outlet of the water replenishment pump (2) is connected to the inlet of the oxygen separator (6) via a pipe; a one-way valve (3) is provided between the oxygen separator (6) and the water replenishment pump (2); the suction port of the circulation pump (4) is connected to the outlet of the oxygen separator (6) via a pipe; the outlet of the circulation pump (4) is connected to the inlet of the electrolytic cell (5) via a pipe; the outlet of the electrolytic cell (5) is connected to the return port of the oxygen separator (6) via a pipe; the hydrogen outlet of the electrolytic cell (5) is connected to the hydrogen inlet of the hydrogen separator (10) via a pipe; the oxygen outlet of the oxygen separator (6) is connected to the oxygen inlet pipe of the mixer (7) via a pipe. The gas source is connected to the gas inlet pipe of the mixer (7); a gas flow control valve (9) and a flow meter (8) are sequentially arranged between the gas source and the mixer (7); the hydrogen outlet of the hydrogen separator (10) is connected to the inlet of the hydrogen pressure control valve (12) through a pipe; the oxygen outlet of the oxygen separator (6) is connected to the inlet of the oxygen pressure control valve (11) through a pipe; the water outlet of the hydrogen separator (10) is connected to the water tank (1) through a pipe.

2. The oxygen safety emission system for an electrolytic hydrogen production system according to claim 1, characterized in that, The outlet of the oxygen separator (6) is provided with a wire mesh I for separating reaction water and oxygen. Oxygen flows out from the top of the oxygen separator (6) after being mixed with compressed gas through a mixer (7) and then passing through an oxygen pressure control valve (11) to adjust the pressure of the mixed gas.

3. The oxygen safety emission system for an electrolytic hydrogen production system according to claim 1, characterized in that, The outlet of the hydrogen separator (10) is provided with a wire mesh II for separating water vapor and hydrogen, and the hydrogen is connected to the hydrogen pressure control valve (12) from the top of the hydrogen separator (10).

4. The oxygen safety emission system for an electrolytic hydrogen production system according to claim 1, characterized in that, The mixer (7) includes: a shell (71), a central tube (72), a conical shell (73), an oxygen inlet pipe (74), an outlet pipe (75), a partition (76), and an inlet pipe (77); the oxygen inlet pipe (74) and the inlet pipe (77) are fixedly connected to the outer wall of the shell (71); the conical shell (73) and the partition (76) are fixedly connected to the inner wall of the shell (71), and the partition (76) and the inner wall of the shell form a mixing chamber (78); the central tube (72) passes through the partition (76) and the mixing chamber (78); The mixing chamber (78) is connected to the bottom opening of the central tube (72) through the bottom opening of the conical shell (73), and the top of the central tube (72) is connected to the air outlet pipe (75).

5. The oxygen safety emission system for an electrolytic hydrogen production system according to claim 1, characterized in that, The gas source is air, nitrogen, or any gas with a reduced pure oxygen concentration.

6. The oxygen safety emission system for an electrolytic hydrogen production system according to claim 1, characterized in that, The circulating pump (4) causes the circulating water to flow sequentially through the electrolytic cell (5), the oxygen separator (6), and then connect to the inlet of the circulating pump (4).

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