CN116752165A - Thermal cycle electrolysis hydrogen production system - Google Patents

Abstract

The invention discloses a thermal cycle electrolysis hydrogen production system, which includes a heat cycle electrolysis hydrogen generator. The heat cycle electrolysis hydrogen generator includes a heat exchange coil, a heat cycle electrolysis cold cover and a heat cycle electrolyzer that are interlocked with each other; The electrolytic cell is provided with pure water supply insulated pipelines, positive electrodes and negative electrodes; the thermal cycle electrolysis cold cover is provided with an oxygen outlet and a hydrogen outlet, and the input ends of the two located in the heat cycle electrolysis cold cover pass through the first cylindrical The bracket and the second cylindrical bracket are connected with the heat circulation electrolyzer; the heat exchange coil is coiled on the first cylindrical bracket and the second cylindrical bracket. The thermal cycle electrolysis hydrogen production system provided by the present invention can efficiently collect heat energy.

Description

Thermal cycle electrolysis hydrogen production system

Technical field

The invention relates to the field of electrolytic hydrogen production, and in particular to a mechanical equipment system that efficiently converts electrical energy into hydrogen energy through thermal energy recovery and recycling technology. It can be used for hydrogen production from water and hydrogen production from new energy sources (solar energy, wind energy, ocean energy, etc.) and other extensive green energy production scenarios.

Background technique

The existing electrolytic hydrogen production technology has multiple branches, but the differences are not obvious. The overall energy conversion rate is about 75%. The reasons for the low conversion rate are as follows:

1) The heat energy generated during the hydrogen production process is not recycled: Existing hydrogen production equipment uses a cooling system to discharge and discard the heat generated, and the core temperature of the equipment is generally above 70 degrees. High core temperature will cause the water required for hydrogen production to evaporate, produce water vapor, and increase humidity.

2) Additional energy is required for cooling and dehumidification: In addition to the energy consumption of cooling the equipment, the higher core temperature of the equipment makes the hydrogen and oxygen produced also have a higher humidity, which means that dehumidification energy must also be spent. Consumption.

It can be seen from the above that in order to develop hydrogen production equipment with extremely high energy conversion rate, it is necessary to have an electrolytic hydrogen generator that can efficiently collect heat energy and a thermal energy recycling system.

Contents of the invention

The object of the present invention is to provide a thermal cycle electrolysis hydrogen production system that can efficiently collect thermal energy.

In order to achieve the above object, the present invention provides a thermal cycle electrolysis hydrogen production system, which includes a heat cycle electrolysis hydrogen generator. The heat cycle electrolysis hydrogen generator includes a heat exchange coil, an interlocking heat cycle electrolysis cold cover and a heat cycle electrolysis tank; the thermal cycle electrolytic cell is provided with pure water supply insulated pipelines, positive electrodes and negative electrodes; the thermal cycle electrolysis cold cover is provided with an oxygen outlet and a hydrogen outlet, both of which are located in the input ends of the heat cycle electrolysis cold cover and pass through respectively The first cylindrical bracket and the second cylindrical bracket are connected with the heat circulation electrolyzer; the heat exchange coil is coiled on the first cylindrical bracket and the second cylindrical bracket.

As a further improvement of the present invention, the thermal cycle electrolysis cold cover is also connected to a first sleeve groove section located below the first cylindrical bracket, and a second sleeve groove section located below the second cylindrical bracket; the first sleeve The lower part of the groove section corresponds to the positive electrode and is provided with a first notch. The lower part of the second groove section corresponds to the negative electrode and is provided with a second notch. The first notch and the second notch are arranged oppositely. ; A ventilation opening located on the thermal cycle electrolysis cold cover is provided between the upper parts of the first trough section and the second trough section.

As a further improvement of the present invention, a slatted bracket is connected to the bottom of the second cylindrical bracket; between the outer wall of the first cylindrical bracket and the inner side of the thermal cycle electrolysis cold cover, The inner sides of the cold covers are spaced apart and form a cold-drying section. The cold-drying section is connected with the heat circulation electrolyzer. A first ventilation hole is provided on the side wall of the first cylindrical bracket. The inner cavity of the first cylindrical bracket is connected with oxygen. The outlet is connected; a second ventilation hole is provided on the side wall of the second cylindrical bracket, and the inner cavity of the second cylindrical bracket is connected with the hydrogen outlet.

As a further improvement of the present invention, the heat exchange coil includes a cold air inlet, an oxygen cold drying section, a hydrogen cold drying section, a water and steam cooling section and a hot gas outlet connected in sequence along the cold air flow direction; the oxygen cold drying section is coiled in the third On the side wall of one cylindrical support, the hydrogen cold-drying section is coiled on the side wall of the second cylindrical support, and the water and steam cooling sections are coiled on the slatted support.

As a further improvement of the present invention, the water outlet of the pure water supply insulated pipeline is located at the bottom of the inner cavity of the thermal cycle electrolyzer; the pure water supply insulated pipeline passes through the middle of the side wall of the thermal cycle electrolyzer and is equipped with a float valve.

As a further improvement of the present invention, an insulating permanent magnet is provided in the inner cavity of the thermal cycle electrolytic cell; the two ends of the insulating permanent magnet are respectively provided with a permanent magnet negative pole and a permanent magnet positive pole; the permanent magnet negative pole is adjacent to the positive electrode, and the permanent magnet negative pole is adjacent to the positive electrode. The positive magnetic pole is adjacent to the negative electrode.

As a further improvement of the present invention, it also includes a thermal energy recycling system. The thermal energy recycling system is provided with a high-pressure gas pipe and a high-pressure insulation gas pipe. The high-pressure gas pipe, the heat exchange coil and the high-pressure insulation gas pipe are connected in sequence along the air flow direction.

As a further improvement of the present invention, the high-pressure insulated gas pipe is also connected to a regenerative power source through an electronically controlled flow valve, and the regenerative power source is electrically connected to the positive electrode and the negative electrode.

beneficial effects

Compared with the existing technology, the advantages of the thermal cycle electrolysis hydrogen production system of the present invention are:

1. The thermal cycle electrolytic hydrogen generator is composed of a thermal cycle electrolyzer and a thermal cycle electric cold cover. It is an electrolytic hydrogen generator that can efficiently collect heat energy. Its collection rate of heat energy generated in the hydrogen production process is more than 100%. The temperature of the water entering the tank will also decrease: in a traditional hydrogen production tank, the temperature of the tank water is generally higher than the room temperature (for example, 30°C higher); however, in the thermal circulation electrolyzer of this technical solution, due to the heat exchange coil When the pure water in the thermal circulation electrolyzer is cooled, the temperature of the pure water in the thermal circulation electrolyzer will be lower than room temperature (for example, 5°C lower).

2. The thermal energy recycling system uses the heat source cooling and residual heat regeneration power system with patent application number 2021113580630, and its recovery rate of waste heat can reach about 80%. Therefore, the energy conversion rate of hydrogen production in a thermal cycle electrolysis hydrogen production system composed of a thermal cycle electrolysis hydrogen generator and a thermal energy recycling system will effectively increase to about 90%.

3. The thermal cycle electrolysis hydrogen generator is used as the energy conversion center to convert electrical energy into hydrogen energy and thermal energy. The thermal energy is fully recovered into the thermal energy recycling system through heat exchange. The thermal energy recycling system recycles the recovered energy. The system can achieve near-zero energy consumption by earning air energy (meaning that the temperature of the exhaust gas from the thermal energy recycling system is lower than the temperature of the inhaled gas). Energy consuming operation. According to the law of conservation of energy: the energy input of the entire system is electricity, water, and air; the energy output includes hydrogen energy, heat energy, cold air, heat loss and other micro-losses. If the energy conversion rate of the system is measured by "hydrogen energy/electric energy", its value will be around 90%.

The invention will become clearer from the following description in conjunction with the accompanying drawings, which are used to explain embodiments of the invention.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is the front view of the thermal cycle electrolysis hydrogen generator;

Figure 2 is a top view of the thermal cycle electrolysis hydrogen generator;

Figure 3 is a top view of the internal structure of the thermal cycle electrolyzer;

Figure 4 is a side view of the negative electrode;

Figure 5 is a front cross-sectional view of the thermal cycle electrolysis hydrogen generator;

Figure 6 is the front view of the thermal cycle electrolysis cold cover;

Figure 7 is a front cross-sectional view of the thermal cycle electrolysis cold cover;

Figure 8 is a front view of the heat exchange coil;

Figure 9 is a cross-sectional view of the working state of the thermal cycle electrolysis hydrogen generator;

Figure 10 is a schematic diagram of the thermal cycle electrolysis hydrogen production system.

Detailed ways

Embodiments of the present invention will now be described with reference to the accompanying drawings.

Example

Specific embodiments of the present invention are shown in Figures 1 to 10. A thermal cycle electrolysis hydrogen production system includes a heat cycle electrolysis hydrogen generator. The heat cycle electrolysis hydrogen generator includes a heat exchange coil 3, an interlocking heat exchanger Circulation electrolysis cold cover 1 and hot circulation electrolyzer 2. The thermal cycle electrolytic cell 2 is provided with a pure water supply insulating pipeline 21, a positive electrode 41 and a negative electrode 42. The thermal cycle electrolysis cold cover 1 is provided with an oxygen outlet 11 and a hydrogen outlet 12. The input ends of the two are located in the heat cycle electrolysis cold cover 1 and are connected to the thermal cycle electrolyzer through the first cylindrical bracket 15 and the second cylindrical bracket 16 respectively. 2 connected. The heat exchange coil 3 is coiled around the first cylindrical support 15 and the second cylindrical support 16 .

Among them, the thermal circulation electrolyzer 2 carries electrolyte, insulating permanent magnets, pure water supply insulating pipelines 21, and electrodes. The negative electrode 42 is used to generate hydrogen gas and heat. The rectangular design will help increase the contact surface with the electrolyte, slightly reduce the resistance, and help improve the energy conversion rate, as shown in Figure 4. The positive electrode 41 generates oxygen, and the rectangular design will help increase the contact surface with the electrolyte, slightly reduce the resistance, and help improve the energy conversion rate.

Thermal cycle electrolysis cold cover 1 includes an insulating cover 13. The outer wall of the insulating cover 13 is provided with a cover flange 131. When the thermal cycle electrolysis cold cover 1 is fastened with the thermal cycle electrolysis tank 2, the cover flange 131 is placed on the thermal cycle electrolysis cell 2. Follow the edge of the top opening of electrolytic tank 2.

The thermal cycle electrolysis cold cover 1 is also connected to a first sleeve section 111 located below the first cylindrical bracket 15 and a second sleeve section 121 located below the second cylindrical bracket 16 . The inner cavity of the first sleeve section 111 is connected with the outside of the second cylindrical bracket 16 , and the second sleeve section 121 is connected with the outside of the first cylindrical bracket 15 . The lower part of the first sleeve section 111 corresponds to the positive electrode 41 and is provided with a first notch 112. The lower part of the second sleeve section 121 corresponds to the negative electrode 42 and is provided with a second notch 122. The first notch 112 and The second notches 122 are arranged oppositely. A ventilation opening 14 on the thermal cycle electrolysis cold cover 1 is provided between the upper parts of the first sleeve section 111 and the second sleeve section 121 . The ventilation port 14 is a discharge port for water vapor and free residual gas generated in the oxygen and hydrogen isolation area. After the assembly is completed, the positive electrode 41 extends into the inside of the bottom of the first sleeve section 111 , and the negative electrode 42 extends into the inside of the bottom of the second sleeve section 121 .

The bottom of the second cylindrical bracket 16 is connected with a slat bracket 17 . The outer wall of the first cylindrical bracket 15 and the inner side of the thermal cycle electrolysis cold cover 1 are spaced apart from each other, and the outer wall of the second cylindrical bracket 16 and the inner side of the thermal cycle electrolysis cold cover 1 are spaced apart to form a cold drying section 18. The section 18 is connected to the thermal circulation electrolytic cell 2 . A first ventilation hole 151 is provided on the side wall of the first cylindrical support 15 . The inner cavity of the first cylindrical support 15 is connected to the oxygen outlet 11 . A second ventilation hole 161 is provided on the side wall of the second cylindrical bracket 16 , and the inner cavity of the second cylindrical bracket 16 is connected with the hydrogen outlet 12 . At least the lower part of the slat support 17 is soaked in the electrolyte.

The heat exchange coil 3 is the heat source recovery section of the thermal energy recycling system, which includes a cold air inlet 31, an oxygen cold drying section 32, a hydrogen cold drying section 33, a water and steam cooling section 34 and a hot gas outlet 35 that are connected in sequence along the cold air flow direction. . The oxygen cold-drying section 32 is coiled on the side wall of the first cylindrical support 15 , the hydrogen cold-drying section 33 is coiled on the side wall of the second cylindrical support 16 , and the water and steam cooling section 34 is coiled on the slat support 17 .

The water outlet 22 of the pure water supply insulated pipeline 21 is located at the bottom of the inner cavity of the thermal circulation electrolyzer 2, specifically behind the negative electrode 42, which will assist the movement of HO-, which will reduce resistance and help improve the energy conversion rate. The pure water supply insulated pipeline 21 passes through the middle of the side wall of the thermal circulation electrolyzer 2 and is provided with a float valve 23. The float valve 23 can automatically control the water inflow.

An insulating permanent magnet 5 is provided in the inner cavity of the thermal cycle electrolytic cell 2 . The two ends of the insulating permanent magnet 5 are respectively provided with a permanent magnet negative pole 51 and a permanent magnet positive pole 52. The permanent magnet negative pole 51 is adjacent to the positive electrode 41 , and the permanent magnet positive pole 52 is adjacent to the negative electrode 42 . The insulated permanent magnet 5 forms a fixed magnetic field, which will assist the movement of HO-, which will reduce the resistance and help improve the energy conversion rate. At the same time, the ions in the electrolyte are also partitioned during shutdown, which is beneficial to reaching production capacity as soon as the machine is started.

The thermal circulation electrolysis cold cover 1 and the thermal circulation electrolysis tank 2 are closely nested, and the first set of tank sections 111 and the second set of tank sections 121 effectively separate the gas into zones. By setting up the heat exchange coil 3, the freezing heat energy recovery and cold-drying functions of the zones are realized. There are first notches 112 and second notches 122 arranged oppositely in the oxygen and hydrogen separation interval, which facilitates the movement of HO-.

The thermal circulation electrolytic tank 2 is filled with electrolyte. The electrolyte is 30% alkaline electrolyte, specifically potassium hydroxide is used, which increases the energy conversion rate by about 5% compared to sodium hydroxide.

As shown in Figure 9, the water located in the reaction heat release zone is heated and releases water vapor. At the same time, the water body and steam cooling section 34 of the heat exchange coil 3 on the top will make the overall water temperature of the electrolyzer slightly lower than the incoming water, and turn the water vapor back into condensed water. This process is also a process of thermal energy recovery.

The thermal cycle electrolysis hydrogen production system also includes a thermal energy recycling system 6. The thermal energy recycling system 6 is provided with a high-pressure gas pipe 61 and a high-pressure thermal insulation gas pipe 62. The high-pressure gas pipe 61, the heat exchange coil 3 and the high-pressure thermal insulation gas pipe 62 are arranged in sequence along the direction of the air flow. Connected.

The high-pressure heat preservation gas pipe 62 is also connected to a regenerative power source 8 through an electronically controlled flow valve 7 . The regenerative power source 8 is electrically connected to the positive electrode 41 and the negative electrode 42 .

The working process of the thermal cycle electrolysis hydrogen production system is as follows:

1) The thermal energy recycling system 6 is started and cold air is delivered to the thermal cycle electrolytic hydrogen generator through the high-pressure gas pipe 61;

2) Input direct current to the positive electrode 41 and negative electrode 42 of the thermal cycle electrolysis hydrogen generator, and inject pure water into the thermal cycle electrolyzer 2 through the pure water supply insulated pipeline 21;

3) The negative electrode 42 of the thermal cycle electrolytic hydrogen generator generates hydrogen and heat, in which the hydrogen moves upward to the outside of the second cylindrical bracket 16, passes through the second ventilation hole 161 and enters the second cylindrical bracket 16. This process is heated The hydrogen cold-drying section 33 of the exchange coil 3 is cooled and dehumidified and then output from the hydrogen outlet 12. The heat is completely recovered by the heat exchange coil 3 and flows back to the thermal energy recycling system 6 through the high-pressure insulation gas pipe 62; the heat generated by the positive electrode 41 The oxygen moves upward to the outside of the first cylindrical support 15 , enters the first cylindrical support 15 through the first ventilation hole 151 , is cooled and dehumidified by the oxygen drying section 32 of the heat exchange coil 3 , and is output from the oxygen outlet 11 . The steam cooling section 34 is immersed in the electrolyte and can cool the pure water in the thermal circulation electrolytic tank.

4) The energy recovered through the heat exchange coil 3 is divided into two paths, one of which converts the gas kinetic energy into electrical energy through the regenerative power source 8 and feeds it back to the positive and negative electrodes of the thermal cycle electrolytic hydrogen generator, and the other path is used as kinetic energy. Return it to the thermal energy recycling system 6.

The energy conversion rate is calculated as follows:

During the electrolysis process, 75% of the electrical energy is directly converted into hydrogen energy, and 25% is converted into thermal energy. After 25% of the thermal energy enters the thermal energy recycling system 6, 80% is recycled and converted into hydrogen energy. Therefore, the energy conversion rate of the thermal cycle electrolysis hydrogen production system is (0.25*0.8+0.75)*100%=95%, which is about 90%.

The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the above disclosed embodiments, but should cover various modifications and equivalent combinations based on the essence of the present invention.

Claims (9)

1. The thermal cycle electrolysis hydrogen production system is characterized by comprising a thermal cycle electrolysis hydrogen production device, wherein the thermal cycle electrolysis hydrogen production device comprises a heat exchange coil pipe (3), a thermal cycle electrolysis cold cover (1) and a thermal cycle electrolysis tank (2), wherein the thermal cycle electrolysis cold cover and the thermal cycle electrolysis cold cover are mutually buckled; the heat circulation electrolytic tank (2) is provided with a purified water supply insulating pipeline (21), a positive electrode (41) and a negative electrode (42); an oxygen outlet (11) and a hydrogen outlet (12) are arranged on the hot circulation electrolytic cold cover (1), and the input ends of the two are respectively communicated with the hot circulation electrolytic tank (2) through a first cylindrical bracket (15) and a second cylindrical bracket (16); the heat exchange coil (3) is coiled on the first cylindrical support (15) and the second cylindrical support (16).

2. A system for producing hydrogen by thermal cycle electrolysis according to claim 1, wherein the cover (1) is further connected with a first sleeve section (111) under the first tubular support (15), a second sleeve section (121) under the second tubular support (16); a first notch (112) is formed in the lower portion of the first sleeve groove section (111) corresponding to the positive electrode (41), a second notch (122) is formed in the lower portion of the second sleeve groove section (121) corresponding to the negative electrode (42), and the first notch (112) and the second notch (122) are arranged oppositely; an air vent (14) positioned on the hot circulation electrolytic cold cover (1) is arranged between the upper parts of the first sleeve groove section (111) and the second sleeve groove section (121).

3. A system for producing hydrogen by thermal cycling electrolysis according to claim 2, wherein the bottom of the second tubular support (16) is connected with a slat support (17); the first cylindrical support (15) is arranged between the outer side wall of the first cylindrical support (15) and the inner side of the hot circulation electrolytic cold cover (1), the second cylindrical support (16) is arranged between the outer side wall of the second cylindrical support and the inner side of the hot circulation electrolytic cold cover (1) at intervals and forms a cold dry section (18), the cold dry section (18) is communicated with the hot circulation electrolytic tank (2), a first ventilation hole (151) is formed in the side wall of the first cylindrical support (15), and the inner cavity of the first cylindrical support (15) is communicated with the oxygen outlet (11); the side wall of the second cylindrical support (16) is provided with a second ventilation hole (161), and the inner cavity of the second cylindrical support (16) is communicated with the hydrogen outlet (12).

4. A thermal cycle electrolysis hydrogen production system according to claim 3 wherein the heat exchange coil (3) comprises a cold air inlet (31), an oxygen cold dry section (32), a hydrogen cold dry section (33), a water and steam cooling section (34) and a hot gas outlet (35) connected in sequence along the cold air flow direction; the oxygen cooling dry section (32) is coiled on the side wall of the first cylindrical support (15), the hydrogen cooling dry section (33) is coiled on the side wall of the second cylindrical support (16), and the water body and steam cooling section (34) is coiled on the slat support (17).

5. A system for producing hydrogen by thermal cycle electrolysis according to claim 1, wherein the water outlet (22) of the purified water supply insulation pipe (21) is located at the bottom of the inner chamber of the thermal cycle electrolyzer (2); the purified water supply insulation pipeline (21) passes through the middle part of the side wall of the thermal circulation electrolytic tank (2) and is provided with a ball float valve (23).

6. A system for producing hydrogen by thermal cycle electrolysis according to claim 1, wherein the inner cavity of the thermal cycle electrolysis cell (2) is provided with an insulated permanent magnet (5); two ends of the insulated permanent magnet (5) are respectively provided with a permanent magnet negative electrode (51) and a permanent magnet positive electrode (52); a permanent magnet negative electrode (51) is adjacent to the positive electrode (41), and a permanent magnet positive electrode (52) is adjacent to the negative electrode (42).

7. The thermal cycle electrolysis hydrogen production system according to claim 1, further comprising a thermal energy recycling system (6), wherein the thermal energy recycling system (6) is provided with a high-pressure air pipe (61) and a high-pressure heat preservation air pipe (62), and the high-pressure air pipe (61), the heat exchange coil (3) and the high-pressure heat preservation air pipe (62) are sequentially communicated in the air flow direction.

8. The thermal cycle electrolysis hydrogen production system according to claim 7, wherein the high-pressure heat preservation air pipe (62) is further connected with a regeneration power source (8) through an electric control flow valve (7), and the regeneration power source (8) is electrically connected with the positive electrode (41) and the negative electrode (42).

9. A system for producing hydrogen by thermal cycling electrolysis according to claim 1, wherein the thermal cycling electrolysis cell (2) is filled with electrolyte; the electrolyte is 30% alkaline electrolyte.