Hydrogen production condensate return differential pressure output system

Abstract

The present invention discloses a hydrogen production condensate reflux differential pressure output system, including a hydrogen droplet catcher, having a first inlet, a first hydrogen outlet and a condensate outlet, an oxygen separator, having a second inlet, a first oxygen outlet and an electrolyte outlet, a first regulating valve, having a second hydrogen inlet and a second hydrogen outlet, a hydrogen channel between the second hydrogen inlet and the second hydrogen outlet, a first differential pressure unit arranged in the hydrogen channel, and a second regulating valve, having a third oxygen inlet and a third oxygen outlet, an oxygen channel between the third oxygen inlet and the third oxygen outlet, and a second differential pressure unit arranged in the oxygen channel. The present invention uses two regulating valves to control the hydrogen pressure to be always greater than the oxygen pressure, and can adjust the pressure difference between the two by adjusting the spring pressure, so as to realize the staggered collection of hydrogen and oxygen, and the automatic recovery of condensate.

Description

Technical Field

[0001] The invention relates to the technical field of water electrolysis hydrogen production equipment, and in particular to a hydrogen production differential pressure output system. Background Art

[0002] With global warming, environmental degradation, and reduced oil resources, all countries are actively developing new energy sources. Hydrogen energy is widely recognized as a clean energy source for use in fuel cell systems. It has been applied to the market in batches, such as fuel cell vehicles and hydrogen refueling stations. Currently, hydrogen is mainly produced through hydrolysis hydrogen production devices, which produce gases including hydrogen and oxygen.

[0003] However, in the existing hydrogen production system, the recovery of oxygen-containing condensed water is a big problem. In many cases, a separate recovery system needs to be set up, which wastes costs. In addition, pressure control during hydrogen recovery is also a problem. If the pressure of hydrogen and oxygen is the same, it will affect the purity of hydrogen production. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a hydrogen production condensate reflux differential pressure output system.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A hydrogen production condensate reflux differential pressure output system, comprising:

[0007] a hydrogen droplet trap having a first inlet, a first hydrogen outlet and a condensate outlet,

[0008] an oxygen separator having a second inlet, a first oxygen outlet and an electrolyte outlet,

[0009] a first regulating valve having a second hydrogen inlet and a second hydrogen outlet, wherein the second hydrogen inlet is connected to the first hydrogen outlet of the hydrogen droplet collector, a hydrogen channel is formed between the second hydrogen inlet and the second hydrogen outlet, and a first differential pressure unit is provided in the hydrogen channel,

[0010] a second regulating valve having a third oxygen inlet and a third oxygen outlet, wherein the third oxygen inlet is connected to the first oxygen outlet of the oxygen separator, an oxygen channel is formed between the third oxygen inlet and the third oxygen outlet, and a second differential pressure unit is arranged in the oxygen channel,

[0011] The two sides of the first differential pressure unit of the first regulating valve receive the pressure of the hydrogen in the hydrogen channel and the combined pressure respectively; the combined pressure is the sum of the pressure of the oxygen entering the oxygen inlet of the second regulating valve and the pressure of a compression spring on the first differential pressure unit;

[0012] The two sides of the second differential pressure unit of the second regulating valve receive the oxygen pressure and the hydrogen pressure in the oxygen channel respectively; the hydrogen pressure is equal to the hydrogen pressure entering the hydrogen inlet of the first regulating valve.

[0013] Preferably, the first inlet of the hydrogen droplet catcher is connected to the water electrolyzer and the cooler through a pipeline, so as to receive the hydrogen containing saturated water vapor transmitted therefrom, the first hydrogen outlet is arranged above the hydrogen droplet catcher, and the condensate outlet is arranged below the hydrogen droplet catcher, and a water-permeable diaphragm is arranged inside the hydrogen droplet catcher, so as to separate the first hydrogen outlet and the condensate outlet.

[0014] Preferably, the second inlet of the oxygen separator is connected to the water electrolyzer through a pipeline, and is used to receive the electrolyte containing oxygen transmitted from the water electrolyzer. It is arranged above the oxygen separator, the first oxygen outlet is arranged on the side of the oxygen separator, and the electrolyte outlet is arranged below the oxygen separator and is connected to the bottom of the water electrolyzer.

[0015] Preferably, the first regulating valve is formed by screwing a first valve cover and a first valve body, which are hollow to form an internal space, the first differential pressure unit is bolted between the first valve cover and the first valve body, and the internal space is divided into a first hydrogen chamber and a first oxygen chamber by the first differential pressure unit, the first hydrogen chamber is connected to the second hydrogen inlet and the second hydrogen outlet, and the compression spring is abutted on the surface of the partition member located on one side of the first oxygen chamber.

[0016] Preferably, the second regulating valve is formed by screwing a second valve cover and a second valve body, which are hollow to form an internal space, and the second differential pressure unit is bolted between the second valve cover and the second valve body, and the internal space is divided into a second hydrogen chamber and a second oxygen chamber by the second differential pressure unit, and the second oxygen chamber is connected to a third oxygen inlet and a third oxygen outlet.

[0017] Preferably, a stainless steel valve seat is fixed in each of the first valve body and the second valve body, and a valve core is fixed on the first differential pressure unit or the second differential pressure unit respectively. Both the first differential pressure unit and the second differential pressure unit are fluoroplastic diaphragms, and their elastic changes enable the valve core to selectively seal the valve seat.

[0018] Preferably, the valve seat has a central hole, and the valve core is a conical free end that can selectively extend into the central hole.

[0019] Preferably, a return spring is sleeved on the outer periphery of the valve core, one end of the return spring abuts against the valve seat, and the other end of the return spring abuts against the first differential pressure unit and the second differential pressure unit respectively.

[0020] Preferably, a first sealing ring is provided between the valve seat and the first valve body and the second valve body respectively, and the valve seat and the first valve body and the second valve body are tightly fitted.

[0021] Preferably, the first hydrogen outlet of the hydrogen droplet collector is connected to two branches, one of which is connected to the second hydrogen inlet of the first regulating valve, and the other branch is connected to the third hydrogen inlet on the second valve cover of the second regulating valve; the first oxygen outlet of the oxygen separator is connected to two branches, one of which is connected to the third oxygen inlet of the second regulating valve, and the other branch is connected to the second oxygen inlet on the first valve cover of the first regulating valve.

[0022] The beneficial effects of the present invention are mainly reflected in:

[0023] 1. Use two regulating valves to control the hydrogen pressure to always be greater than the oxygen pressure, and adjust the pressure difference between the two by adjusting the spring pressure to achieve staggered collection of hydrogen and oxygen;

[0024] 2. Control the hydrogen pressure to be always greater than the oxygen pressure, so that the condensate can pass through the water-permeable diaphragm as much as possible, so that the hydrogen purity is higher and it is all output in the form of gas, obtaining high-purity hydrogen;

[0025] 3. The condensate produced in the hydrogen droplet collector is automatically recovered, and there is no need to add additional condensate recovery equipment, which reduces costs; at the same time, the condensate is effectively recycled to save resources;

[0026] 4. Simple and exquisite structure, purely mechanical regulating valve, no need to worry about equipment failure caused by power outage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The technical solution of the present invention is further described below in conjunction with the accompanying drawings:

[0028] Figure 1 : A schematic diagram of an embodiment of the present invention;

[0029] Figure 2 : A schematic diagram of a first regulating valve in an embodiment of the present invention;

[0030] Figure 3 : Figure 2 A magnified view of part A;

[0031] Figure 4 : Schematic diagram of the second regulating valve in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0033] In the description of the scheme, it should be noted that the terms "center", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Moreover, in the description of the scheme, with the operator as a reference, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

[0034] like Figures 1 to 4 As shown, the present invention discloses a hydrogen production condensate reflux differential pressure output system, comprising a hydrogen droplet collector 1, having a first inlet 11, a first hydrogen outlet 12 and a condensate outlet 13; an oxygen separator 2, having a second inlet 21, a first oxygen outlet 22 and an electrolyte outlet 23, a first regulating valve 3, having a second hydrogen inlet 31 and a second hydrogen outlet 32, the second hydrogen inlet 31 is connected to the first hydrogen outlet 12 of the hydrogen droplet collector 1, a hydrogen channel is formed between the second hydrogen inlet 31 and the second hydrogen outlet 32, a first differential pressure unit is arranged in the hydrogen channel, a second regulating valve 4, having a third oxygen inlet 41 and a third oxygen outlet 42, the third oxygen inlet 41 is connected to the first oxygen outlet 22 of the oxygen separator 2, an oxygen channel is formed between the third oxygen inlet 41 and the third oxygen outlet 42, and a second differential pressure unit is arranged in the oxygen channel.

[0035] Specifically, the first inlet 11 of the hydrogen droplet catcher 1 is connected to the water electrolyzer (not shown in the figure) and the cooler 100 through a pipeline, and is used to receive the hydrogen containing saturated water vapor transmitted therefrom. The first hydrogen outlet 12 is arranged above the hydrogen droplet catcher 1, and the condensate outlet 13 is arranged below the hydrogen droplet catcher 1. A water-permeable diaphragm 14 is arranged inside the hydrogen droplet catcher 1 to separate the first hydrogen outlet 12 and the condensate outlet 13.

[0036] The hydrogen containing saturated water vapor produced by electrolysis passes through a cooler and enters the hydrogen droplet collector 1. Since the internal space of the hydrogen droplet collector 1 is much larger than the cross-sectional area of ​​the delivery pipeline in an instant, a condensation effect is generated, and the hydrogen is output from the first hydrogen outlet 12. After accumulation, the water contained in the hydrogen penetrates to the oxygen side through the water-permeable membrane to form a condensate, which enters the oxygen separator 2 from the condensate outlet 13.

[0037] like Figure 1 As shown, the second inlet 21 of the oxygen separator 2 is connected to the water electrolyzer through a pipeline, and is used to receive the electrolyte containing oxygen transmitted from the water electrolyzer, which is arranged above the oxygen separator 2. The first oxygen outlet 22 is arranged at the upper side of the oxygen separator 2, and the electrolyte outlet 23 is arranged below the oxygen separator 2 and communicated with the bottom of the water electrolyzer. The condensate outlet 13 of the hydrogen droplet collector 1 is connected to the lower part of the oxygen separator 2, so that the condensate can be mixed with the electrolyte, and after the oxygen is precipitated, they are input into the bottom of the water electrolyzer together. Such a structure can recycle the condensate and save resources.

[0038] The present invention is characterized in that: the first hydrogen outlet 12 of the hydrogen droplet collector 1 is connected to two branches, one of which is connected to the second hydrogen inlet 31 of the first regulating valve 3, and the other is connected to the third hydrogen inlet 47 on the second valve cover 43 of the second regulating valve 4; the first oxygen outlet 22 of the oxygen separator 2 is connected to two branches, one of which is connected to the third oxygen inlet 41 of the second regulating valve 4, and the other is connected to the second oxygen inlet 37 on the first valve cover 33 of the first regulating valve 3.

[0039] Combined with Figure 2 , Figure 3As shown, the first regulating valve 3 is formed by a first valve cover 33 and a first valve body 34 being screwed together, and the two are hollow to form an internal space, and the first differential pressure unit is bolted between the first valve cover 33 and the first valve body 34. In other embodiments, the first valve cover 33, the first valve body 34 and the first differential pressure unit can also be fixedly connected by other means, such as other mechanical mechanisms with fixing functions or strong adhesives. The internal space is divided into a first hydrogen chamber 35 and a first oxygen chamber 36 by the first differential pressure unit, and the first hydrogen chamber 35 is connected to the second hydrogen inlet 31 and the second hydrogen outlet 32. A compression spring 30 is arranged inside the first oxygen chamber 36, and the two sides of the first differential pressure unit of the first regulating valve 3 receive the pressure of hydrogen in the hydrogen channel and the composite pressure respectively; the composite pressure is the sum of the oxygen pressure input from the first oxygen outlet 22 into the first oxygen chamber 36 of the first regulating valve 3 and the pressure of the compression spring 30 on the first differential pressure unit. The oxygen pressure of the first oxygen outlet 22 input into the first oxygen chamber 36 of the first regulating valve 3 is equal to the oxygen pressure of the first oxygen outlet 22 input into the third oxygen inlet 41 of the second regulating valve 4. The compression spring 6 is disposed on the surface of the partition member 4 located on one side of the first oxygen chamber 36.

[0040] like Figure 4 As shown, the second regulating valve 4 is formed by a second valve cover 43 and a second valve body 44 being screwed and fixed, and the two are hollow to form an internal space, and the second differential pressure unit is bolted between the second valve cover 43 and the second valve body 44, and the internal space is divided into a second hydrogen chamber 45 and a second oxygen chamber 46 by the second differential pressure unit, and the second oxygen chamber 46 is connected to the third oxygen inlet 41 and the third oxygen outlet 42. In other embodiments, the second valve cover 43, the second valve body 44 and the second differential pressure unit can also be fixedly connected by other means, such as other mechanical mechanisms with fixing functions or strong adhesives. The two sides of the second differential pressure unit of the second regulating valve 4 receive the oxygen pressure and hydrogen pressure in the oxygen channel respectively; the hydrogen pressure is the hydrogen pressure of the first hydrogen outlet 12 input into the second hydrogen chamber 45 of the second regulating valve 4, which is also equal to the hydrogen pressure of the first hydrogen outlet 12 input into the second hydrogen inlet 31 of the first regulating valve (3).

[0041] A stainless steel valve seat 5 is fixed in each of the first valve body 34 and the second valve body 44, and a valve core 6 is fixed on the first differential pressure unit or the second differential pressure unit respectively. Both the first differential pressure unit and the second differential pressure unit are fluoroplastic diaphragms 9. The fluoroplastic diaphragms have good high temperature resistance and corrosion resistance, and are water-permeable but air-tight. The elastic change of the fluoroplastic diaphragms enables the valve core 6 to selectively seal the valve seat 5. Specifically, the valve seat 5 has a central hole 51, and the valve core 6 is a conical free end that can selectively extend into the central hole 51. Figure 3 As shown, the conical free end of the valve core 5 improves the accuracy of the valve core 5 extending into the center hole 21, and a second sealing ring 10 is provided on the inner wall of the center hole 21. After the valve core 5 is extended into the center hole 21, its outer wall is in close contact with the second sealing ring 10 to block the center hole 21. At the same time, the setting of the second sealing ring 10 can protect the valve core 5 from excessive wear during use.

[0042] In order to balance the pressure on both sides of the first differential pressure unit and the second differential pressure unit and help the valve core 6 to reset, a reset spring 7 is sleeved on the outer periphery of the valve core 6, one end of which abuts against the valve seat 5, and the other end abuts against the first differential pressure unit and the second differential pressure unit respectively.

[0043] A first sealing ring 8 is provided between the valve seat 5 and the first valve body 34 and the second valve body 44, respectively, and the valve seat 5 is tightly fitted with the first valve body 34 and the second valve body 44. The first sealing ring 8 has elastic properties to ensure that the valve seat 5 and the first valve body 34 and the second valve body 44 maintain close contact, thereby ensuring the stability of the valve seat 5.

[0044] The working process of the present invention is briefly described below:

[0045] First, the water electrolyzer electrolyzes hydrogen and oxygen;

[0046] Secondly, the hydrogen containing saturated water vapor produced by electrolysis passes through a cooler and enters the hydrogen droplet collector 1. Since the internal space of the hydrogen droplet collector 1 is much larger than the cross-sectional area of ​​the delivery pipeline in an instant, a condensation effect is generated, and the hydrogen is output from the first hydrogen outlet 12; the water contained in the hydrogen accumulates and penetrates to the oxygen side through the water-permeable membrane to form a condensate, which enters the oxygen separator 2 from the condensate outlet 13;

[0047] Then, the oxygen generated by electrolysis is mixed in the electrolyte, enters the oxygen separator from the second inlet 21, and is precipitated from the electrolyte (existing technology, no further description is needed), and the electrolyte from which oxygen is precipitated flows back to the water electrolyzer through the electrolyte outlet 23; oxygen is output from the first oxygen outlet 22;

[0048] Finally, the output oxygen and hydrogen are collected at different times under the regulation of the first regulating valve 3 and the second regulating valve 4 respectively.

[0049] Due to the presence of the compression spring 40, a pressure difference is ensured between the pressure of hydrogen and the pressure of oxygen in the present invention to control the hydrogen pressure to always be greater than the oxygen pressure, thus playing a basic regulating role for the hydrogen generator to produce high-purity hydrogen.

[0050] When electrolysis starts, part of the generated hydrogen enters the hydrogen channel in the first regulating valve 3 from the second hydrogen inlet 31, and part enters the second regulating valve 4 from the third hydrogen inlet 47; part of the generated oxygen enters the first regulating valve 3 from the second oxygen inlet 37, and part enters the second regulating valve 4 from the third oxygen inlet 41.

[0051] In the present invention, the second regulating valve 4 is always in the normally open mode, that is, its third oxygen inlet 41 and the third oxygen outlet 42 are always connected; on the contrary, the first regulating valve 3 is always in the normally closed mode, that is, the second hydrogen inlet 31 and the second hydrogen outlet 32 ​​are always closed. Only when the hydrogen pressure coming out of the hydropower tank is greater than a certain value, the pressure of the compression spring is offset to open the first regulating valve 3. At this time, due to the excessive pressure of the hydrogen, the second regulating valve 4 is closed, that is, the oxygen channel is closed.

[0052] In the present invention, the hydrogen pressure is controlled to be always greater than the oxygen pressure, so that the condensate during electrolysis can pass through the water-permeable diaphragm as much as possible, so that the hydrogen produced in the hydrogen production process has a higher purity and is output in the form of gas, thereby obtaining highly clean hydrogen; the condensate produced in the hydrogen droplet collector is automatically recovered, and there is no need to add additional condensate recovery equipment, thereby reducing costs; at the same time, the condensate is effectively recycled to save resources.

[0053] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0054] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. Hydrogen production condensate reflux differential pressure output system, characterized by: include A hydrogen droplet trap (1) having a first inlet (11), a first hydrogen outlet (12) and a condensate outlet (13), an oxygen separator (2) having a second inlet (21), a first oxygen outlet (22) and an electrolyte outlet (23), a first regulating valve (3) having a second hydrogen inlet (31) and a second hydrogen outlet (32), wherein the second hydrogen inlet (31) is connected to the first hydrogen outlet (12) of the hydrogen droplet collector (1), a hydrogen channel is formed between the second hydrogen inlet (31) and the second hydrogen outlet (32), and a first differential pressure unit is provided in the hydrogen channel, a second regulating valve (4) having a third oxygen inlet (41) and a third oxygen outlet (42), wherein the third oxygen inlet (41) is connected to the first oxygen outlet (22) of the oxygen separator (2), an oxygen channel is provided between the third oxygen inlet (41) and the third oxygen outlet (42), and a second differential pressure unit is provided in the oxygen channel, The two sides of the first differential pressure unit of the first regulating valve (3) receive the pressure of the hydrogen in the hydrogen channel and the combined pressure respectively; the combined pressure is the sum of the pressure of the oxygen entering the oxygen inlet (41) of the second regulating valve (4) and the pressure of a compression spring (30) on the first differential pressure unit; The two sides of the second differential pressure unit of the second regulating valve (4) receive the oxygen pressure and the hydrogen pressure in the oxygen channel respectively; the hydrogen pressure is equal to the hydrogen pressure entering the hydrogen inlet (31) of the first regulating valve (3); A water-permeable diaphragm (14) is provided inside the hydrogen droplet collector (1) for separating the first hydrogen outlet (12) and the condensate outlet (13); The first regulating valve (3) is formed by fixing a first valve cover (33) and a first valve body (34), the two being hollow to form an internal space, the first differential pressure unit being fastened between the first valve cover (33) and the first valve body (34) by a strong adhesive, the internal space being divided into a first hydrogen chamber (35) and a first oxygen chamber (36) by the first differential pressure unit, the first hydrogen chamber (35) being connected to the second hydrogen inlet (31) and the second hydrogen outlet (32), and the compression spring (6) being abutted on the surface of the partition member (4) located on one side of the first oxygen chamber (36); The second regulating valve (4) is formed by fixing a second valve cover (43) and a second valve body (44), the two being hollow to form an internal space, the second differential pressure unit being bolted between the second valve cover (43) and the second valve body (44), the internal space being divided into a second hydrogen chamber (45) and a second oxygen chamber (46) by the second differential pressure unit, the second oxygen chamber (46) being connected to a third oxygen inlet (41) and a third oxygen outlet (42); A stainless steel valve seat (5) is fixed in each of the first valve body (34) and the second valve body (44), and a valve core (6) is fixed on the first differential pressure unit or the second differential pressure unit, respectively. Both the first differential pressure unit and the second differential pressure unit are fluoroplastic diaphragms (9), whose elastic changes enable the valve core (6) to selectively seal the valve seat (5).

2. The hydrogen production condensate reflux differential pressure output system according to claim 1, characterized in that: The first inlet (11) of the hydrogen droplet catcher (1) is connected to the water electrolyzer and the cooler (100) through a pipeline, and is used to receive hydrogen containing saturated water vapor transmitted therefrom; the first hydrogen outlet (12) is arranged above the hydrogen droplet catcher (1), and the condensate outlet (13) is arranged below the hydrogen droplet catcher (1).

3. The hydrogen production condensate reflux differential pressure output system according to claim 2, characterized in that: The second inlet (21) of the oxygen separator (2) is connected to the water electrolyzer via a pipeline and is used to receive the electrolyte containing oxygen transmitted from the water electrolyzer. The second inlet (21) is arranged above the oxygen separator (2). The first oxygen outlet (22) is arranged on the side of the oxygen separator (2). The electrolyte outlet (23) is arranged below the oxygen separator (2) and is connected to the bottom of the water electrolyzer.

4. The hydrogen production condensate reflux differential pressure output system according to claim 1, characterized in that: The valve seat (5) has a central hole (51), and the valve core (6) is a conical free end that can selectively extend into the central hole (51).

5. The hydrogen production condensate reflux differential pressure output system according to claim 4, characterized in that: The valve core (6) is sleeved with a return spring (7) on its outer periphery, one end of which abuts against the valve seat (5), and the other end of which abuts against the first differential pressure unit and the second differential pressure unit respectively.

6. The hydrogen production condensate reflux differential pressure output system according to claim 5, characterized in that: A first sealing ring (8) is provided between the valve seat (5) and the first valve body (34) and the second valve body (44), respectively, and the valve seat (5) and the first valve body (34) and the second valve body (44) are tightly fitted.

7. The hydrogen production condensate reflux differential pressure output system according to claim 1, characterized in that: The first hydrogen outlet (12) of the hydrogen droplet collector (1) is connected to two branches, one of which is connected to the second hydrogen inlet (31) of the first regulating valve (3), and the other is connected to the third hydrogen inlet (47) on the second valve cover (43) of the second regulating valve (4); the first oxygen outlet (22) of the oxygen separator (2) is connected to two branches, one of which is connected to the third oxygen inlet (41) of the second regulating valve (4), and the other is connected to the second oxygen inlet (37) on the first valve cover (33) of the first regulating valve (3).

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