System for producing and supplying domestic hot water by hydrogen cooling and working method thereof

Abstract

The application discloses a system for producing and supplying hydrogen-cooled domestic hot water. The system comprises a hydrogen production device, a hydrogen adding device, a hot water production heat exchanger, a cold water unit, a cooling tower and a hot water tank; the hydrogen production device is connected with the hydrogen adding device; the hydrogen production device is connected with the cooling tower and the hot water production heat exchanger respectively to form a closed loop; the hydrogen adding device is connected with the cold water unit and the hot water production heat exchanger respectively to form a closed loop; the hot water production heat exchanger is connected with the hot water tank to form a closed loop; and the hot water tank is connected with a user side and a water supplement system respectively. The system has the advantages of improving energy utilization efficiency, fully realizing heat recycling, saving energy and being simple and practical. The application further discloses a working method of the system for producing and supplying hydrogen-cooled domestic hot water.

Description

Technical Field

[0001] This invention relates to the field of renewable clean energy hydrogen technology applications, specifically a system for the combined production, refueling, cooling, and supply of domestic hot water. More specifically, it is a system that utilizes the heat generated during the hydrogen production and refueling process to indirectly heat a portion of the cold water to provide domestic hot water, ensuring good heat dissipation of the hydrogen production and refueling units while improving energy utilization and providing domestic hot water. This invention also relates to the operating method of the system for the combined production, refueling, cooling, and supply of domestic hot water. Background Technology

[0002] With societal development, the use of domestic hot water has become increasingly widespread. Wherever there are people working or living, domestic hot water is needed. Traditionally, domestic hot water is obtained through solar energy, electric heating, or natural gas heating. However, many industrial production areas lack natural gas pipelines, and solar energy is prohibitively expensive, leaving electric heating as the only option. This leads to high energy consumption and reduced economic efficiency in the long run. Over the past decade, the continuous promotion of energy conservation and emission reduction policies has gradually instilled the concept of energy conservation in everyone's minds, achieving significant results. During the 14th Five-Year Plan period, the country has also put forward new requirements and implemented a series of policies and measures to improve energy efficiency, such as implementing key energy conservation and emission reduction projects, promoting clean production in key industries and the resource utilization of industrial waste heat, comprehensively improving building energy efficiency standards, accelerating the development of ultra-low energy consumption buildings and clean heating, and accelerating the large-scale application of industrial waste heat and renewable energy in urban heating. As domestic hot water is part of building energy consumption, taking energy-saving measures is also very meaningful and will bring significant economic and social value.

[0003] Hydrogen is a key area for future clean energy development. As hydrogen production and refueling technologies mature and improve, the production and refueling capacity is gradually increasing, generating a greater amount of heat. Traditionally, heat dissipation methods involve heat exchange through chillers or cooling towers, with the heat ultimately released into the air. This results in significant heat waste and low energy efficiency.

[0004] Therefore, it is necessary to develop a system that improves energy efficiency by combining hydrogen production, cooling, and domestic hot water supply. Summary of the Invention

[0005] The primary objective of this invention is to provide a system for producing, hydrogenating, cooling, and supplying domestic hot water, thereby improving energy efficiency, fully realizing heat recovery and utilization, saving energy, and being simple and practical.

[0006] The second objective of this invention is to provide a method for operating the aforementioned system for producing, hydrogenating, cooling, and supplying domestic hot water, thereby improving energy utilization efficiency.

[0007] To achieve the first objective of the present invention, the technical solution of the present invention is as follows: a system for producing, adding hydrogen, cooling and supplying domestic hot water, characterized in that it includes a hydrogen production device, a hydrogen addition device, a hot water heat exchanger, a chiller unit, a cooling tower and a hot water tank;

[0008] Connect the hydrogen production equipment to the hydrogen refueling equipment;

[0009] The hydrogen production equipment is connected to the cooling tower and the hot water heat exchanger to form a closed loop.

[0010] The hydrogenation equipment is connected to the chiller and the hot water heat exchanger to form a closed loop.

[0011] The hot water heat exchanger is connected to the hot water tank in a closed loop; this invention adds a heat exchange system to the cooling pipes of the original hydrogen production and addition system, which heats the domestic hot water through the heat exchanger.

[0012] The hot water tank is connected to both the user side and the water replenishment system. This invention does not change the function of the original hydrogen production and refueling system; it simply recovers and utilizes the heat generated during the original hydrogen production and refueling process, forming a novel, practical, and highly operable energy utilization system that fully realizes heat recovery and utilization.

[0013] In the above technical solution, electric flow regulating valves are installed on both the cooling water pipe and the hot water circulation pipe;

[0014] The hot water circulation pump is installed on the hot water circulation pipe and is located between the hot water tank and the hot water heat exchanger;

[0015] A gate valve is installed on the connecting pipe between the hot water tank and the user side;

[0016] An electric gate valve is installed on the connecting pipe between the hot water tank and the water supply system.

[0017] In the above technical solution, the hot water heat exchanger includes a first hot water heat exchanger and a second hot water heat exchanger;

[0018] The hydrogen production equipment and the first hot water heat exchanger are connected in a closed loop via cooling water pipes, and the first hot water heat exchanger and the hot water tank are connected in a closed loop via hot water circulation pipes.

[0019] The hydrogenation equipment and the second hot water heat exchanger are connected in a closed loop via cooling water pipes, and the second hot water heat exchanger and the hot water tank are connected in a closed loop via hot water circulation pipes.

[0020] In the above technical solution, the chiller unit is connected to the hydrogen refueling equipment via cooling water pipes;

[0021] The cooling tower is connected to the hydrogen production equipment via cooling water pipes.

[0022] In the above technical solution, the hot water tank is equipped with a liquid level monitoring system (such as a liquid level sensor) and a water temperature monitoring system (such as a temperature sensor); the hot water tank has a heat storage function, which can maintain the water temperature after heating, and the tank body is equipped with a liquid level monitoring system (such as a liquid level sensor), which is linked with an electric gate valve to realize automatic water replenishment to the set water level; adopting a linkage automatic control design, the hot water tank is equipped with a water temperature monitoring system (such as a temperature sensor), which can control the valve opening, opening degree and the start and stop of the hot water circulation pump according to the water temperature in the hot water tank, which can meet the needs of different hot water working conditions;

[0023] A water temperature monitoring system (such as a temperature sensor) is installed on the cooling water pipes; a liquid level monitoring system and a water temperature monitoring system are installed in the hot water tank, and a water temperature monitoring system is installed on the cooling water pipes. The equipment operation status and hot water utilization status can be detected in a timely manner during hydrogen production and addition.

[0024] To achieve the second objective of the present invention, the technical solution of the present invention is as follows: the working method of the system for producing, hydrogenating, cooling, and supplying domestic hot water, characterized by comprising the following steps.

[0025] Step 1: After all components of the combined hydrogen production, hydrogen refueling, cooling and domestic hot water supply system are installed according to standards and pass the tests, fill the cooling water pipes with water, and then turn on the hydrogen production equipment, hydrogen refueling equipment, chiller unit, cooling tower, etc. in sequence, and adjust the combined hydrogen production, hydrogen refueling and cooling and domestic hot water supply system until the working temperature is stable and normal.

[0026] Step 2: Open the electric gate valve, the hot water tank will automatically replenish water to the designed capacity, and then close the electric gate valve;

[0027] Step 3: Turn on the hot water circulation pump. The flow rate of the hot water circulation pump is adjusted according to the set supply and return water temperatures to ensure that the hot water system, including the hot water heat exchanger, hot water tank and hot water circulation pipe, is working properly.

[0028] Step 4: Close the electric flow regulating valve on the cooling water pipe connecting the hydrogen production equipment and the cooling tower, close the electric flow regulating valve on the cooling water pipe connecting the hydrogen refueling equipment and the chiller unit, and open the electric flow regulating valve on the cooling water pipe connecting the hot water heat exchanger and the hydrogen production equipment, and open the electric flow regulating valve on the cooling water pipe connecting the hot water heat exchanger and the hydrogen refueling equipment.

[0029] The system for producing, hydrogenating, cooling, and supplying domestic hot water has been adjusted to a mode where the hydrogen production and hydrogen refueling equipment heats the cold water in the hot water tank.

[0030] The heat generated during the operation of the hydrogen production and hydrogen refueling equipment can be carried to the hot water heat exchanger by the cooling water in the cooling water pipes.

[0031] Step 5: The hot water circulation pump starts, driving the cold water in the hot water tank to circulate.

[0032] The heat in the hydrogen production equipment and hydrogen refueling equipment is exchanged with the cold water in the hot water tank through the hot water heat exchanger. The entire system works in tandem until the water temperature in the hot water tank reaches the set temperature T1. At this time, the electric flow regulating valve on the cooling water pipe connecting the hot water heat exchanger and the hydrogen production equipment is closed.

[0033] The hot water circulation pump stops running, and at the same time, the electric flow regulating valve on the cooling water pipe connecting the hydrogen production equipment and the cooling tower is opened, as is the electric flow regulating valve on the cooling water pipe connecting the hydrogen refueling equipment and the chiller unit. The system for supplying domestic hot water through the combined cooling of hydrogen production and refueling is adjusted to a cooling mode for the hydrogen production equipment and the hydrogen refueling equipment by the chiller unit and the cooling tower.

[0034] Step Six: When the water temperature in the hot water tank drops to the set temperature T2, repeat steps four and five until the water temperature in the hot water tank rises to the set temperature T1; repeat this process.

[0035] Step 7: When the user starts using hot water, the water level in the hot water tank drops. Repeat steps 2 to 6 to ensure the continuous and stable operation of the entire system for producing, adding hydrogen, cooling and supplying domestic hot water.

[0036] In the above technical solution, the opening degree of the electric flow regulating valve can be adaptively adjusted and controlled according to the set cooling water supply and return temperatures.

[0037] This invention directly heats cold water with the heat generated during the hydrogenation process to produce hot water for domestic use. The advantages of this invention are:

[0038] (1) Based on the current layout of various process equipment in the hydrogen production station, the heat dissipation of hydrogen production and hydrogen refueling equipment is well integrated with the domestic hot water system, making full use of the heat generated in the hydrogen production and refueling process by domestic cold water. The heat exchange efficiency is high and the energy utilization rate is high during operation.

[0039] (2) A solution that can automatically switch the water temperature of the hot water tank and cool the hydrogenation equipment;

[0040] (3) The system has a simple principle and is easy to operate. It can automatically adjust the valve opening according to the hot water demand, which is highly feasible and has obvious benefits. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of the domestic hot water system for production, hydrogenation, cooling and supply according to the present invention.

[0042] Figure 1 The arrows in the diagram indicate the direction of water flow.

[0043] In the diagram, 1-hydrogen production equipment, 2-hydrogen refueling equipment, 3-hot water heat exchanger, 3.1-first hot water heat exchanger, 3.2-second hot water heat exchanger, 4-chiller unit, 5-cooling tower, 6-hot water tank, 7-cooling water pipe, 8-hot water circulation pipe, 9-hot water circulation pump, 10-electric flow regulating valve, 11-gate valve, 12-electric gate valve, 13-user side, 14-water replenishment system. Detailed Implementation

[0044] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, these descriptions do not constitute a limitation of the present invention and are merely illustrative. The advantages of the present invention will become clearer and easier to understand through this description.

[0045] This invention recovers and utilizes the large amount of heat generated during the hydrogen production and reprocessing process, directly heating cold water to produce domestic hot water for user use, thereby improving energy efficiency; it overcomes the problem of existing traditional heat dissipation methods that waste a lot of heat by exchanging heat through chillers or cooling towers and finally discharging it into the air.

[0046] This invention fully combines the two systems of hot water needed for domestic use and the large amount of heat generated during the hydrogen production and refueling process, realizing the reuse of thermal energy. By using a heat exchanger, the heat carried by the water in the pipeline of the hydrogen production and refueling equipment is exchanged to heat the domestic cold water, while reducing the temperature rise of the hydrogen production and refueling equipment, thereby making the entire hydrogen production and refueling process safer, more stable and more efficient.

[0047] See Figure 1 This embodiment mainly consists of three parts: hydrogen production and refueling equipment (including hydrogen production equipment, hydrogen refueling equipment, etc.), a cooling system (including chiller units, cooling towers, cooling pipes, etc.), and a heat exchange system (including hot water heat exchangers, hot water circulation pipes, hot water circulation pumps, hot water tanks, etc.). The hydrogen production and refueling equipment is skid-mounted, and the number of equipment is determined according to the production scale. The cooling system and heat exchange system are connected to each piece of equipment to achieve parallel operation of different numbers of equipment. The cooling or hot water production capacity can be adjusted by opening and closing corresponding valves. The size of the hot water tank can be determined according to the heat production capacity of the hydrogen production and refueling equipment during operation and the needs of the user side. The hydrogen production, refueling, cooling, and domestic hot water supply system is built according to the principle of large equipment to small equipment. After the components are built, they are connected by pipelines and equipped with safety components and automation components.

[0048] The hydrogen production equipment mainly consists of an electrolyzer, a gas-liquid separator, a drying and purification device, a hydrogen compression device, a cooling water pump, and other equipment, and is the core component of hydrogen production through water electrolysis.

[0049] Hydrogen refueling equipment mainly consists of buffer tanks, compressors, hydrogen storage valve groups, hydrogen dispensers, cooling water pumps, etc., and is the core part of hydrogen consumption.

[0050] Hot water heat exchanger: One side is connected to the cooling water pipe of the hydrogen production and refueling equipment through a pipe, and the other side is connected to the hot water tank through a pipe. It is a tool to exchange the heat generated in the hydrogen production and refueling process to supply domestic hot water. The heat is preferentially passed through the cooling water pipe connected to the hot water heat exchanger and then heated by the hot water heat exchanger to heat the cold water in the hot water circulation pipe.

[0051] Chiller unit: Connected to the hydrogen refueling equipment via cooling water pipes, it cools the hydrogen refueling equipment and removes heat under normal operating conditions.

[0052] Cooling tower: Connected to the hydrogen production equipment via cooling water pipes, it cools the hydrogen production equipment and removes heat under normal operating conditions.

[0053] Hot water tank: Used to store domestic hot water, and connected to the hot water heat exchanger through a hot water circulation pipe.

[0054] Cooling water pipes: These are pipes that connect to the hydrogen production and refueling equipment, cooling towers, and chiller units. They are filled with cooling water to carry away the heat generated by the hydrogen production and refueling equipment.

[0055] Hot water circulation pipe: connected to the hot water heat exchanger and hot water tank, and filled with domestic water.

[0056] Hot water circulation pump: Located between sections of hot water circulation pipes, it provides the power to transform domestic cold water into hot water and deliver it to the hot water tank.

[0057] The operating method of the system for producing, hydrogenating, cooling, and supplying domestic hot water according to the present invention includes the following steps:

[0058] (1) After each system is installed according to the standard and passes the test, the cooling water pipe 7 is filled with water, and then the hydrogen production equipment 1, hydrogen addition equipment 2, chiller unit 4, cooling tower 5, etc. are turned on in sequence until the system working temperature is stable and normal.

[0059] (2) Open the electric gate valve, and the hot water tank will automatically replenish water to the design capacity, and then close the electric gate valve.

[0060] (3) Turn on the hot water circulation pump 9. The pump flow rate is adjusted according to the set supply and return water temperatures to ensure the hot water system works normally.

[0061] (4) Close the electric flow regulating valve 10 on the cooling water pipe 7 connecting hydrogen production equipment 1 and cooling tower 5, close the electric flow regulating valve 10 on the cooling water pipe 7 connecting hydrogen refueling equipment 2 and chiller unit 4, and open the electric flow regulating valve 10 on the cooling water pipe 7 connecting hot water heat exchanger 3 and hydrogen production equipment 1, and open the electric flow regulating valve 10 on the cooling water pipe 7 connecting hot water heat exchanger 3 and hydrogen refueling equipment 2, to ensure that the heat generated during the operation of the absorption and hydrogen production equipment can be carried by the cooling water to the first hot water heat exchanger 3.1 and the second hot water heat exchanger 3.2. The opening degree of the electric flow regulating valve 10 can be adaptively adjusted and controlled according to the set cooling supply and return water temperature;

[0062] (5) The first hot water heat exchanger 3.1 and the second hot water heat exchanger 3.2 exchange heat. The entire system works in tandem until the water temperature in the hot water tank 6 reaches the set temperature T1. At this time, the electric flow regulating valve 10 on the cooling water pipe 7 connecting the hot water heat exchanger 3 and the hydrogen production equipment 1 is closed, and the electric flow regulating valve 10 on the cooling water pipe 7 connecting the hot water heat exchanger 3 and the hydrogen addition equipment 2 is closed. The hot water circulation pump 9 stops running. At the same time, the electric flow regulating valve 10 on the cooling water pipe 7 connecting the hydrogen production equipment 1 and the cooling tower 5 is opened, and the electric flow regulating valve 10 on the cooling water pipe 7 connecting the hydrogen addition equipment 2 and the chiller unit 4 is opened, and the cooling mode is adjusted to that of the chiller unit 4 and the cooling tower 5.

[0063] (6) When the water temperature in the hot water tank 6 drops to the set temperature T2, repeat steps (4)-(5) and so on.

[0064] (7) When the user starts using hot water, the water level drops. Repeat steps (2) to (6) to ensure the continuous and stable operation of the entire system.

[0065] Finally, it should be emphasized that the above description is only one system of the present invention. Obviously, the present invention is not limited to the above, and many details can be modified. All modifications that can be directly derived or conceived by those skilled in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

[0066] All other unspecified parts belong to the prior art.

Claims

1. A system for producing, hydrogenating, cooling, and supplying domestic hot water, characterized in that: The system comprises a hydrogen production device (1), a hydrogenation device (2), a hot water production heat exchanger (3), a cold water unit (4), a cooling tower (5) and a hot water tank (6); The hydrogen production device (1) is connected with the hydrogenation device (2); The hydrogen production device (1) is connected with the cooling tower (5) and the hot water production heat exchanger (3) respectively to form a closed loop; The hydrogenation device (2) is connected with the cold water unit (4) and the hot water production heat exchanger (3) respectively to form a closed loop; The hot water production heat exchanger (3) is connected with the hot water tank (6) to form a closed loop; The hot water tank (6) is connected with a user side (13) and a water supplement system (14) respectively; The hot water production heat exchanger (3) comprises a first hot water production heat exchanger (3.1) and a second hot water production heat exchanger (3.2); The hydrogen production device (1) is connected with the first hot water production heat exchanger (3.1) through a cooling water pipe (7) to form a closed loop, and the first hot water production heat exchanger (3.1) is connected with the hot water tank (6) through a hot water circulation pipe (8) to form a closed loop; The hydrogenation device (2) is connected with the second hot water production heat exchanger (3.2) through the cooling water pipe (7) to form a closed loop, and the second hot water production heat exchanger (3.2) is connected with the hot water tank (6) through the hot water circulation pipe (8) to form a closed loop; The hot water tank (6) is provided with a liquid level monitoring system and a water temperature monitoring system; the hot water tank (6) has a heat storage function and can maintain water temperature after heating, and the hot water tank (6) is provided with a liquid level monitoring system and an electric gate valve linkage to realize automatic water supplement to a set water level; a linkage automatic control design is adopted, the hot water tank (6) is provided with a water temperature monitoring system, and the valve opening, opening degree and start-stop of a hot water circulation pump (9) are controlled according to the water temperature in the hot water tank (6) to meet different hot water working condition requirements; A water temperature monitoring system is arranged on the cooling water pipe (7); the cooling water pipe is matched with the water temperature monitoring system, and equipment operation conditions and hot water utilization conditions are found in time during hydrogen production and hydrogenation.

2. The system for simultaneously generating, hydrogen-cooling and supplying domestic hot water according to claim 1, characterized in that: Electric flow regulating valves (10) are arranged on the cooling water pipe (7) and the hot water circulation pipe (8); The hot water circulation pump (9) is arranged on the hot water circulation pipe (8) and located between the hot water tank (6) and the hot water production heat exchanger (3); A gate valve (11) is arranged on a connecting pipeline of the hot water tank (6) and the user side (13); An electric gate valve (12) is arranged on a connecting pipeline of the hot water tank (6) and the water supplement system (14).

3. The system for simultaneously generating, hydrogen-cooling and supplying domestic hot water according to claim 1, characterized in that: The cold water unit (4) is connected with the hydrogenation device (2) through the cooling water pipe (7); The cooling tower (5) is connected with the hydrogen production device (1) through the cooling water pipe (7).

4. The system for simultaneously generating, hydrogen-cooling and supplying domestic hot water according to claim 3, characterized in that: A liquid level monitoring system and a water temperature monitoring system are arranged in the hot water tank (6). A water temperature monitoring system is arranged on the cooling water pipe (7).

5. The method of claim 1-4, wherein the system for providing hydrogen and cooling water for domestic hot water supply is characterized in that: The system comprises the following steps, Step one: after each component in the hydrogen production and hydrogenation cooling combined life hot water system is installed according to standards and is qualified after testing, the cooling water pipe (7) is filled with water, then the hydrogen production device (1), the hydrogenation device (2) and the cold water unit (4) and the cooling tower (5) are opened in turn, and the hydrogen production and hydrogenation cooling combined life hot water system is adjusted until the working temperature is stable and normal. Step two: open the electric gate valve (12), the hot water tank (6) automatically replenish water to the design capacity, and then close the electric gate valve (12); Step three: open the hot water circulating pump (9), the flow of the hot water circulating pump (9) is adjusted according to the set supply and return water temperature, to ensure that the hot water system including the hot water heater (3), the hot water tank (6) and the hot water circulating pipe (8) works normally; Step four: close the electric flow regulating valve (10) on the cooling water pipe (7) connecting the hydrogen production equipment (1) and the cooling tower (5), close the electric flow regulating valve (10) on the cooling water pipe (7) connecting the hydrogenation equipment (2) and the water chilling unit (4), open the electric flow regulating valve (10) on the cooling water pipe (7) connecting the hot water heater (3) and the hydrogen production equipment (1), open the electric flow regulating valve (10) on the cooling water pipe (7) connecting the hot water heater (3) and the hydrogenation equipment (2); The system of hydrogen production and hydrogenation cooling combined supply of domestic hot water is adjusted to the mode of heating the cold water in the hot water tank (6) by the hydrogen production equipment (1) and the hydrogenation equipment (2); The heat generated during the operation of the hydrogen production equipment (1) and the hydrogenation equipment (2) can be brought to the hot water heater (3) by the cooling water in the cooling water pipe (7); Step five: the hot water circulating pump (9) starts to drive the output and input circulation of the cold water in the hot water tank (6); The heat in the hydrogen production equipment (1) and the hydrogenation equipment (2) is exchanged with the cold water in the hot water tank (6) through the hot water heater (3), until the water temperature in the hot water tank (6) reaches the set temperature T1, at which time the electric flow regulating valve (10) on the cooling water pipe (7) connecting the hot water heater (3) and the hydrogen production equipment (1) is closed, and the electric flow regulating valve (10) on the cooling water pipe (7) connecting the hot water heater (3) and the hydrogenation equipment (2) is closed; The hot water circulating pump (9) stops running, and the electric flow regulating valve (10) on the cooling water pipe (7) connecting the hydrogen production equipment (1) and the cooling tower (5) is opened, and the electric flow regulating valve (10) on the cooling water pipe (7) connecting the hydrogenation equipment (2) and the water chilling unit (4) is opened, and the system of hydrogen production and hydrogenation cooling combined supply of domestic hot water is adjusted to the cooling mode of the water chilling unit (4) and the cooling tower (5) for the hydrogen production equipment (1) and the hydrogenation equipment (2); Step six: when the water temperature of the hot water tank (6) is lowered to the set temperature T2, steps four to five are repeated until the water temperature of the hot water tank (6) rises to the set temperature T1; the process is repeated; Step seven: when the user side (13) starts to use hot water, the water level in the hot water tank (6) decreases, and steps two to six are repeated to ensure the continuous and stable operation of the whole system of hydrogen production and hydrogenation cooling combined supply of domestic hot water.

6. The method of claim 5, wherein the system further comprises a heat exchanger, and the method further comprises: heating the water in the heat exchanger by the exhaust heat of the engine; and supplying the heated water to the water tank. The opening of the electric flow regulating valve (10) is adaptively adjusted and controlled according to the set cooling supply and return water temperature.

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