Alkaline hydrogen production electrolytic bath waste heat recycling system and method

Abstract

The invention provides an alkaline hydrogen production electrolytic bath waste heat recycling system and method.The system is characterized in that an electrolytic hydrogen production device and an outdoor cooling device are communicated in a circulating mode through a cooling water return pipeline and a cooling water supply pipeline, and the electrolytic hydrogen production device transmits heat to the outdoor cooling device through a cooling chamber return pipeline; further, the air is released to an outdoor environment; a water inlet and a water outlet of the heating pipeline are communicated with the cooling water return pipeline, the middle section of the heating pipeline extends into the raw water tank, and the heating pipeline obtains cooling water heated by the electrolytic hydrogen production device from the cooling water return pipeline through the water inlet so as to increase the temperature in the raw water tank; the control circuit is used for controlling opening and closing of the heating pipeline. According to the water electrolysis hydrogen production system, the heating pipeline capable of extending into the raw water tank is arranged on the cooling water return pipeline, so that heat emitted by the water electrolysis hydrogen production device is introduced into the raw water tank, and raw water in the raw water tank is heated by the heat originally emitted outdoors.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery for hydrogen production by water electrolysis, and in particular to a system and method for recovering waste heat from an electrolytic cell for alkaline hydrogen production. Background Art

[0002] At present, hydrogen is produced in industry using renewable energy, generally by electrolyzing water in an electrolyzer, and the main type of electrolyzer is an alkaline electrolyzer (i.e., alkaline electrolysis of water to produce hydrogen).

[0003] However, in the waste heat recovery system of the electrolyzer for alkaline hydrogen production, a large amount of heat is released during operation of the electrolyzer, which needs to be taken away by cooling water. This will waste a lot of heat and is not conducive to energy conservation and environmental protection. Summary of the invention

[0004] The present invention provides an alkaline hydrogen production electrolyzer waste heat recovery and utilization system, which is used to effectively utilize the heat emitted during the operation of the electrolytic hydrogen production device and reduce the overall energy consumption of the system. The alkaline hydrogen production electrolyzer waste heat recovery and utilization system includes an electrolytic hydrogen production device, a raw water tank, an outdoor cooling device, a cooling water return pipeline, a cooling water supply pipeline, a heating pipeline and a control circuit, wherein:

[0005] The electrolytic hydrogen production device and the outdoor cooling device are circulated and connected through the cooling water return pipeline and the cooling water supply pipeline. The electrolytic hydrogen production device transfers heat to the outdoor cooling device through the cooling chamber return pipeline, and then releases it to the outdoor environment; the water inlet and the water outlet of the heating pipeline are both connected to the cooling water return pipeline, and the middle section of the heating pipeline is inserted into the raw water tank. The heating pipeline obtains cooling water heated by the electrolytic hydrogen production device from the cooling water return pipeline through the water inlet, so as to increase the internal temperature of the raw water tank; the control circuit is electrically connected to a plurality of sensors and a plurality of electric valves, which are used to control the electric valves according to the temperature signals and pressure signals provided by the sensors, and then control the opening and closing of the heating pipeline.

[0006] In a specific implementation, the alkaline hydrogen production electrolyzer waste heat recovery and utilization system further includes a first electric valve and a second electric valve, wherein:

[0007] The first electric valve is arranged on the heating pipeline near the water inlet and is electrically connected to the control circuit; the second electric valve is arranged on the cooling water return pipeline, located between the water inlet and the water outlet of the heating pipeline, and is electrically connected to the control circuit;

[0008] The control circuit is used to control the opening and closing of the first electric valve and the second electric valve.

[0009] In a specific implementation, the alkaline hydrogen production electrolyzer waste heat recovery system further includes a first temperature sensor and a second temperature sensor, wherein:

[0010] The first temperature sensor is arranged in the cooling water return pipeline, before the water inlet of the heating pipeline, and is electrically connected to the control circuit; the second temperature sensor is arranged inside the raw water tank, and is electrically connected to the control circuit;

[0011] The control circuit is further used to obtain temperature signals sent by the first temperature sensor and the second temperature sensor, and control the opening and closing of the first electric valve and the second electric valve according to the temperature signals.

[0012] In a specific implementation, the alkaline hydrogen production electrolyzer waste heat recovery and utilization system further includes a first pressure detector and a second pressure detector, wherein:

[0013] The first pressure detector is arranged on the cooling water return pipeline, and is located before the water inlet of the heating pipeline; the second pressure detector is arranged on the cooling water return pipeline, and is located after the water outlet of the heating pipeline;

[0014] The first pressure detector and the second pressure detector both have a pressure display.

[0015] In a specific implementation, manual valves are provided near the water inlet and near the water outlet of the heating pipeline; and manual valves are provided on the water inlet pipe and the water outlet pipe of the raw water tank.

[0016] In a specific implementation, the heating pipeline extends into the raw water tank and is arranged in a spiral shape.

[0017] In a specific implementation, the electrolytic hydrogen production device includes a plurality of alkali liquid coolers, and the plurality of alkali liquid coolers are respectively connected to the cooling water return pipeline and the cooling water supply pipeline.

[0018] In a specific implementation, the diameters of the cooling water return pipeline and the cooling water supply pipeline are both 350 mm.

[0019] In a specific implementation, the outdoor cooling device is a cooling tower.

[0020] The present invention also provides a method for recovering waste heat from an alkaline hydrogen production electrolyzer, which is applied to the alkaline hydrogen production electrolyzer waste heat recovery system, comprising:

[0021] Obtain temperature information of cooling water return pipeline and raw water tank;

[0022] Compare the temperature difference between the cooling water return pipe and the inside of the raw water tank to obtain a second temperature comparison result;

[0023] The opening and closing of the heating pipeline is controlled according to the second temperature comparison result.

[0024] In a specific implementation, controlling the opening and closing of the heating pipeline according to the second temperature comparison result further includes:

[0025] If the temperature of the cooling water return pipe is higher than the internal temperature of the raw water tank, turn on the heating pipe.

[0026] In a specific implementation, after obtaining the temperature information of the cooling water return pipe and the inside of the raw water tank, the method further includes:

[0027] Compare the internal temperature of the raw water tank with the optimal operating water temperature of the pure water preparation system to obtain a first temperature comparison result;

[0028] The opening and closing of the heating pipeline is controlled according to the first temperature comparison result and the second temperature comparison result.

[0029] In a specific implementation, controlling the opening and closing of the first electric valve and the second electric valve according to the first temperature comparison result further includes:

[0030] If the internal temperature of the raw water tank is lower than the optimum operating water temperature of the pure water preparation system, turn on the heating pipeline.

[0031] In a specific implementation, after controlling the opening and closing of the heating pipeline according to the second temperature comparison result, the method further includes:

[0032] When the heating pipeline inside the raw water tank is turned on, the internal temperature of the raw water tank is monitored in real time;

[0033] If the internal temperature of the raw water tank is 5°C higher than the optimum operating water temperature of the pure water preparation system, turn off the heating pipeline.

[0034] The present invention provides an electrolytic cell waste heat recovery and utilization system and method for alkaline hydrogen production, wherein the method comprises an electrolytic hydrogen production device, a raw water tank, an outdoor cooling device, a cooling water return pipeline, a cooling water supply pipeline, a heating pipeline and a control circuit, wherein: the electrolytic hydrogen production device and the outdoor cooling device are cyclically connected through the cooling water return pipeline and the cooling water supply pipeline, and the electrolytic hydrogen production device transfers heat to the outdoor cooling device through the cooling chamber return pipeline, and then releases it to the outdoor environment; the water inlet and the water outlet of the heating pipeline are both connected to the cooling water return pipeline, the middle section of the heating pipeline is inserted into the raw water tank, and the heating pipeline obtains cooling water heated by the electrolytic hydrogen production device from the cooling water return pipeline through the water inlet, so as to increase the internal temperature of the raw water tank; the control circuit is electrically connected with a plurality of sensors and a plurality of electric valves, which are used to control the electric valves according to the temperature signals and pressure signals provided by the sensors, and then control the opening and closing of the heating pipeline. The alkaline hydrogen production electrolyzer waste heat recovery system sets a heating pipeline that can penetrate into the raw water tank in the cooling water return pipeline, thereby introducing the heat emitted by the electrolytic hydrogen production device into the raw water tank, and using the heat that originally needs to be emitted to the outside to heat the raw water in the raw water tank. The system can effectively utilize waste heat and reduce overall energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the specific implementation or the prior art description. Obviously, the drawings in the following description are only some specific implementations of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0036] Figure 1 It is a structural schematic diagram of a waste heat recovery and utilization system of an electrolyzer for alkaline hydrogen production according to a specific embodiment of the present invention;

[0037] Figure 2 It is a schematic flow diagram of a method for recovering waste heat from an electrolyzer for producing alkaline hydrogen according to a specific embodiment of the present invention;

[0038] Figure 3 It is a schematic diagram of the operation of a waste heat recovery system for an electrolyzer for alkaline hydrogen production according to a specific embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 100-electrolysis hydrogen production device, 200-raw water tank, 300-outdoor cooling device, 400-cooling water return pipeline, 500-cooling water supply pipeline, 600-heating pipeline, 700-control circuit, pure water preparation system 800, 610-first electric valve, 410-second electric valve, 420-first temperature sensor, 210-second temperature sensor, 430-first pressure detector, 440-second pressure detector. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the specific implementation of the present invention more clear, the specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings. Here, the schematic specific implementation of the present invention and its description are used to explain the present invention, but are not intended to limit the present invention.

[0042] When hydrogen is produced by alkaline electrolysis of water, the raw material is pure water. The process of pure water preparation is usually as follows: ordinary tap water enters the raw water tank for buffering; the booster pump pressurizes the water in the raw water tank to the filter for primary filtration; the high-pressure pump pressurizes the filtered water to the reverse osmosis membrane device for osmotic treatment; the water after osmotic treatment enters the secondary pure water tank for buffering; the booster pump pressurizes the water in the secondary pure water tank to the electric deionization module to remove ions in the water; the deionized pure water enters the pure water tank buffer and is transported to the water point by the water supply pump. From the inherent process perspective, the optimal operating efficiency of the pure water preparation system requires the water temperature to be maintained at around 25°C. In order not to damage the reverse osmosis membrane, the water temperature must not be higher than 60°C. In fact, the temperature of ordinary tap water is around 30°C in summer and around 5°C in winter. That is, in seasons other than summer, the water temperature usually cannot reach the optimal temperature of the pure water preparation system and requires additional heating. Therefore, the applicant considers that the waste heat of the electrolyzer can be used to heat the raw water tank, and then proposes a waste heat recovery and utilization system of the electrolyzer for alkaline hydrogen production, which is used to effectively utilize the heat emitted during the operation of the electrolytic hydrogen production device 100 and reduce the overall energy consumption of the system. Figure 1 As shown, the alkaline hydrogen production electrolyzer waste heat recovery system includes an electrolytic hydrogen production device 100, a raw water tank 200, a pure water preparation system 800, an outdoor cooling device 300, a cooling water return pipeline 400, a cooling water supply pipeline 500, a heating pipeline 600 and a control circuit 700, wherein:

[0043] The electrolytic hydrogen production device 100 is circulated with the outdoor cooling device 300 through the cooling water return pipe 400 and the cooling water supply pipe 500. The electrolytic hydrogen production device 100 transfers heat to the outdoor cooling device 300 through the cooling chamber return pipe, and then releases it to the outdoor environment; the water inlet and outlet of the heating pipe 600 are both connected to the cooling water return pipe 400, and the middle section of the heating pipe 600 is inserted into the raw water tank 200. The heating pipeline 600 obtains the cooling water heated by the electrolytic hydrogen production device 100 from the cooling water return pipeline 400 through the water inlet, so as to increase the internal temperature of the raw water tank 200. The raw water tank 200 is connected to the pure water preparation system 800 for water supply for pure water preparation. The control circuit 700 is electrically connected to a plurality of sensors and a plurality of electric valves, which are used to control the electric valves according to the temperature signals and pressure signals provided by the sensors, and further control the opening and closing of the heating pipeline 600.

[0044] In specific implementation, Figure 1 As shown, in order to effectively control the heating of the raw water in the raw water tank 200 by the heating pipeline 600 and improve the heating efficiency and accuracy, the alkaline hydrogen production electrolyzer waste heat recovery system may further include a first electric valve 610 and a second electric valve 410, wherein:

[0045] The first electric valve 610 is disposed on the heating pipeline 600 near the water inlet and is electrically connected to the control circuit 700; the second electric valve 410 is disposed on the cooling water return pipeline 400, between the water inlet and the water outlet of the heating pipeline 600, and is electrically connected to the control circuit 700;

[0046] The control circuit 700 is used to control the opening and closing of the first electric valve 610 and the second electric valve 410 .

[0047] In specific implementation, Figure 1 As shown, in order to effectively obtain the temperature of the raw water in the cooling water return pipeline 400 and the raw water tank 200, and further control the heating temperature of the raw water in the raw water tank 200, the alkaline hydrogen production electrolyzer waste heat recovery system may also include a first temperature sensor 420 and a second temperature sensor 210, wherein:

[0048] The first temperature sensor 420 is disposed in the cooling water return pipe 400, before the water inlet of the heating pipe 600, and is electrically connected to the control circuit 700; the second temperature sensor 210 is disposed inside the raw water tank 200, and is electrically connected to the control circuit 700;

[0049] The control circuit 700 is further configured to obtain temperature signals sent by the first temperature sensor 420 and the second temperature sensor 210 , and control the opening and closing of the first electric valve 610 and the second electric valve 410 according to the temperature signals.

[0050] In specific implementation, Figure 1 As shown, in order to effectively monitor the pressure in the cooling water return pipe 400, and then confirm whether the heating management is blocked according to the pressure, and improve the heating accuracy, the alkaline hydrogen production electrolyzer waste heat recovery system may also include a first pressure detector 430 and a second pressure detector 440, wherein:

[0051] The first pressure detector 430 is disposed in the cooling water return pipe 400, and is located before the water inlet of the heating pipe 600; the second pressure detector 440 is disposed in the cooling water return pipe 400, and is located after the water outlet of the heating pipe 600;

[0052] The first pressure detector 430 and the second pressure detector 440 both have a pressure display.

[0053] In a specific implementation, in order to facilitate the maintenance of the heating management 600 and the raw water tank 200, manual valves are provided near the water inlet and near the water outlet of the heating pipeline 600; the water inlet pipe and the water outlet pipe of the raw water tank 200 are both provided with manual valves.

[0054] In a specific implementation, the configuration of the heating pipeline 600 may have a variety of implementation schemes, for example, Figure 1 As shown, in order to effectively improve the heating efficiency, the heating pipeline 600 is inserted into the raw water tank 200 and is coiled in a spiral shape.

[0055] In a specific implementation, the electrolytic hydrogen production device 100 includes a plurality of alkali liquid coolers 110 , and the plurality of alkali liquid coolers 110 are respectively connected to the cooling water return pipeline 400 and the cooling water supply pipeline 500 .

[0056] In a specific implementation, there are multiple implementation schemes for selecting the outdoor cooling device 300. For example, since a cooling tower has a relatively excellent cooling effect, the outdoor cooling device 300 can be a cooling tower.

[0057] In specific implementation, there are multiple implementation schemes for setting the diameters of the cooling water return pipe 400 and the cooling water supply pipe 500. For example, low-temperature cooling water enters the alkali liquid cooler, absorbs heat and then enters the outdoor cooling tower, where it dissipates heat into the air through heat exchange with outdoor air, becomes low-temperature cooling water, and then enters the alkali liquid cooler to absorb heat, and the cycle continues; the flow rate and flow velocity of the cooling water need to match the alkali liquid cooler, and the total heat Q that needs to be taken away from the alkali liquid cooler can be calculated based on the specific heat of water and the supply and return water temperatures. The total flow rate of cooling water L = 0.86Q / (Tsupply-Treturn) cubic / hour can be calculated. Further, the flow velocity of cooling water V = 1.2 m / s can be selected, and the diameters of the cooling water return pipe 400 and the cooling water supply pipe 500 can be selected.

[0058] Specifically, the calculation formula for the pipe diameters of the cooling water return pipe 400 and the cooling water supply pipe 500 may be determined according to the following method:

[0059] First, the relationship between flow rate L, flow velocity V and pipe cross-sectional area A is:

[0060] L = V × A;

[0061] For a circular pipe, the cross-sectional area A can be calculated by its radius r (or diameter D, where D =):

[0062]

[0063] Substituting the expression for cross-sectional area A into the flow formula, we get:

[0064]

[0065] By transforming the above formula, we can solve the diameter D:

[0066]

[0067] In summary, we can get a formula to calculate the pipe diameter D based on the flow rate L and flow velocity V.

[0068] Furthermore, given that the cooling water flow rate L = 430 cubic meters per hour, the flow rate L needs to be converted into m 3 / s to match the flow rate unit.

[0069]

[0070] Flow velocity V = 1.2 m / s.

[0071]

[0072] D≈0.343m;

[0073] Therefore, the pipe diameter is 0.343 meters, i.e. 343 millimeters. In practical applications, a 350 pipe close to 343 millimeters can be used as the cooling water return pipe 500 and the cooling water supply pipe 500.

[0074] In a specific embodiment, taking the scale of annual production of 10 million cubic meters of hydrogen as an example, according to the equipment producing hydrogen for 7,000 hours a year, 15 alkaline electrolyzers with a hydrogen production capacity of 100 cubic meters per hour need to be set up; according to the current efficiency of 65% of the electrolyzer, the heating load of the 15 electrolyzers is a total of 2500kW; if this part of the heat is completely discharged by the cooling tower arranged outdoors, the required cooling water volume L=430 cubic meters per hour (calculated based on L=0.86Q / (Tsupply-Treturn) cubic meters per hour, where Tsupply-Treturn=5°); according to the current pure water preparation system, the system efficiency is 40% at a water supply temperature of 20 degrees, the water supply volume is 3.003 cubic meters per hour, and the system efficiency is 60% at a water supply temperature of 25 degrees, and the water supply volume is 2.002 cubic meters per hour. It can be seen that after adopting the waste heat utilization system, the water supply as raw material can save (3003-2002) / 3003=33.33%.

[0075] like Figure 2 As shown, the present invention also provides a method for recovering waste heat from an alkaline hydrogen production electrolyzer, the method being applied to the alkaline hydrogen production electrolyzer waste heat recovery system, comprising:

[0076] 201: Obtain temperature information of the cooling water return pipe and the inside of the raw water tank;

[0077] 204: Compare the temperature difference between the cooling water return pipe and the inside of the raw water tank to obtain a second temperature comparison result;

[0078] 205: Controlling the opening and closing of the heating pipeline according to the second temperature comparison result.

[0079] In a specific implementation, the step 205: controlling the opening and closing of the heating pipeline according to the second temperature comparison result further includes:

[0080] If the temperature of the cooling water return pipe is higher than the internal temperature of the raw water tank, turn on the heating pipe.

[0081] In the specific implementation, in step 201: after obtaining the temperature information of the cooling water return pipe and the inside of the raw water tank, Figure 2 As shown, it also includes:

[0082] 202: Compare the internal temperature of the raw water tank with the optimal operating water temperature of the pure water preparation system to obtain a first temperature comparison result;

[0083] 203: Controlling the opening and closing of the heating pipeline according to the first temperature comparison result.

[0084] In a specific implementation, the step 203: controlling the opening and closing of the first electric valve and the second electric valve according to the first temperature comparison result further includes:

[0085] If the internal temperature of the raw water tank is lower than the optimum operating water temperature of the pure water preparation system, turn on the heating pipeline.

[0086] In a specific implementation, after the step 205: controlling the opening and closing of the heating pipeline according to the second temperature comparison result, Figure 2 As shown, it also includes:

[0087] 206: When the heating pipeline inside the raw water tank is turned on, the internal temperature of the raw water tank is monitored in real time;

[0088] 207: If the internal temperature of the raw water tank is higher than the optimum operating water temperature of the pure water preparation system by 5°C, the heating pipeline is turned off.

[0089] In a specific implementation, Figure 3 As shown, the operation process of the electrolyzer waste heat recovery and utilization system for alkaline hydrogen production is as follows:

[0090] 1. The electrolytic hydrogen production device 100 produces hydrogen in an electrolytic cell. During this process, heat is continuously dissipated. Hydrogen / oxygen carries alkali liquid to bring this part of heat to the alkali liquid cooler 110. The cooling water supply temperature is generally 20-30°C. After absorbing heat in the alkali liquid cooler 110, the temperature is generally 25-35°C, and becomes high-temperature cooling water return water;

[0091] 2. Check the valve status of the waste heat recovery system: ensure that the first electric valve 610 is open and the second electric valve 410 is closed;

[0092] 3. Check the heating coil in the raw water tank 200: If the pressure value displayed by the first pressure detector 430 is equal to the pressure value displayed by the second pressure detector 440, it means that the heating pipeline 600 in the raw water tank 200 is not blocked; if the pressure value displayed by the first pressure detector 430 is not equal to the pressure value displayed by the second pressure detector 440, it means that the heating pipeline 600 in the raw water tank 200 is blocked, and it is necessary to manually close the manual valves at the water inlet and outlet pipes of the raw water tank 200 and the manual valves near the water inlet and near the water outlet of the heating pipeline 600, and then inspect the heating pipeline 600 in the water tank. After the inspection is completed, open the 4 manual valves.

[0093] 4. Detect the water temperature in the raw water tank 200: obtain the temperature signal in the raw water tank 200 according to the second temperature sensor 210. If the water temperature in the raw water tank 200 is greater than or equal to the optimal operating water temperature of the pure water preparation system (25°C), the raw water does not need to be heated. Close the first electric valve 610 and open the second electric valve 410. The high-temperature cooling water returns directly to the outdoor cooling device 300 for heat dissipation. If the water temperature in the raw water tank 200 is lower than the optimal operating water temperature of the pure water preparation system, maintain the original electric valve state.

[0094] 5. Detect the cooling water return temperature and the internal temperature of the raw water tank 200: If the cooling water return temperature is less than or equal to the internal temperature of the raw water tank 200, the cooling water return cannot heat the raw water. Close the first electric valve 610 and open the second electric valve 410. The cooling water return directly enters the outdoor cooling device 300 for heat dissipation. If the cooling water return temperature is greater than the internal temperature of the raw water tank 200, maintain the original electric valve state, and the high-temperature cooling water enters the raw water tank 200. The heat is transferred to the raw water through the heating pipe 600, and the raw water temperature increases.

[0095] 6. Check that the water temperature in the raw water tank 200 is not too high: the optimal operating temperature of the pure water preparation system is 25°C. If the cooling water return temperature is too high, the raw water temperature may be too high. Set the upper limit of the raw water temperature to an optimal temperature rise of 5°C. If the temperature monitored by the second temperature sensor 210 is less than or equal to the optimal operating temperature of the pure water preparation system + 5°C, the cooling water return will continue to enter the raw water tank 200 for heating. If the temperature monitored by the second temperature sensor 210 is greater than the optimal operating temperature of the pure water preparation system + 5°C, the first electric valve 610 will be closed and the second electric valve 410 will be opened, and the high-temperature cooling water return will directly enter the outdoor cooling device 300 for heat dissipation.

[0096] 7. The above-mentioned temperatures and pressures are connected to the control circuit 700, and are interlocked with each other in the control circuit 700; the steps 1-6 are circulated to complete the process of discharging the heat of the electrolytic cell and increasing the raw water temperature.

[0097] In summary, the present invention provides an alkaline hydrogen production electrolyzer waste heat recovery and utilization system and method, wherein the method comprises an electrolytic hydrogen production device 100, a raw water tank 200, a pure water preparation system 800, an outdoor cooling device 300, a cooling water return pipeline 400, a cooling water supply pipeline 500 and a heating pipeline 600, wherein: the electrolytic hydrogen production device 100 is circulated and connected with the outdoor cooling device 300 through the cooling water return pipeline 400 and the cooling water supply pipeline 500, and the electrolytic hydrogen production device 100 is circulated and connected with the outdoor cooling device 300 through the cooling water return pipeline 400 and the cooling water supply pipeline 500. The cooling chamber return water pipeline transfers heat to the outdoor cooling device 300, and then releases it to the outdoor environment; the water inlet and outlet of the heating pipeline 600 are both connected to the cooling water return water pipeline 400, and the middle section of the heating pipeline 600 is set inside the raw water tank 200. The heating pipeline 600 obtains the cooling water heated by the electrolytic hydrogen production device 100 from the cooling water return water pipeline 400 through the water inlet to increase the internal temperature of the raw water tank 200. The raw water tank 200 is connected to the pure water preparation system 800 for water supply for pure water preparation. The alkaline hydrogen production electrolyzer waste heat recovery and utilization system is set in the cooling water return water pipeline 400. The heating pipeline 600 that can be inserted into the raw water tank 200 introduces the heat emitted by the electrolytic hydrogen production device 100 into the raw water tank 200, and uses the heat that originally needs to be emitted to the outdoors to heat the raw water in the raw water tank 200. The system can effectively utilize waste heat and reduce overall energy consumption.

[0098] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A waste heat recovery system for an alkaline hydrogen production electrolyzer, characterized in that: The alkaline hydrogen production electrolyzer waste heat recovery and utilization system includes an electrolytic hydrogen production device, a raw water tank, an outdoor cooling device, a cooling water return pipeline, a cooling water supply pipeline, a heating pipeline and a control circuit, wherein: The electrolytic hydrogen production device and the outdoor cooling device are circulated and connected through the cooling water return pipeline and the cooling water supply pipeline. The electrolytic hydrogen production device transfers heat to the outdoor cooling device through the cooling chamber return pipeline, and then releases it to the outdoor environment; the water inlet and the water outlet of the heating pipeline are both connected to the cooling water return pipeline, and the middle section of the heating pipeline is inserted into the raw water tank. The heating pipeline obtains cooling water heated by the electrolytic hydrogen production device from the cooling water return pipeline through the water inlet, so as to increase the internal temperature of the raw water tank; the control circuit is electrically connected to a plurality of sensors and a plurality of electric valves, which are used to control the electric valves according to the temperature signals and pressure signals provided by the sensors, and then control the opening and closing of the heating pipeline.

2. The alkaline hydrogen production electrolyzer waste heat recovery system according to claim 1, characterized in that: The alkaline hydrogen production electrolyzer waste heat recovery and utilization system further includes a first electric valve and a second electric valve, wherein: The first electric valve is arranged on the heating pipeline near the water inlet and is electrically connected to the control circuit; the second electric valve is arranged on the cooling water return pipeline, located between the water inlet and the water outlet of the heating pipeline, and is electrically connected to the control circuit; The control circuit is used to control the opening and closing of the first electric valve and the second electric valve.

3. The alkaline hydrogen production electrolyzer waste heat recovery system according to claim 2, characterized in that: The alkaline hydrogen production electrolyzer waste heat recovery and utilization system further includes a first temperature sensor and a second temperature sensor, wherein: The first temperature sensor is arranged in the cooling water return pipeline, before the water inlet of the heating pipeline, and is electrically connected to the control circuit; the second temperature sensor is arranged inside the raw water tank, and is electrically connected to the control circuit; The control circuit is further used to obtain temperature signals sent by the first temperature sensor and the second temperature sensor, and control the opening and closing of the first electric valve and the second electric valve according to the temperature signals.

4. The alkaline hydrogen production electrolyzer waste heat recovery system according to claim 2, characterized in that: The alkaline hydrogen production electrolyzer waste heat recovery and utilization system further includes a first pressure detector and a second pressure detector, wherein: The first pressure detector is arranged on the cooling water return pipeline, and is located before the water inlet of the heating pipeline; the second pressure detector is arranged on the cooling water return pipeline, and is located after the water outlet of the heating pipeline; The first pressure detector and the second pressure detector both have a pressure display.

5. The alkaline hydrogen production electrolyzer waste heat recovery system according to claim 4, characterized in that: Manual valves are provided near the water inlet and the water outlet of the heating pipeline; manual valves are provided on the water inlet pipe and the water outlet pipe of the raw water tank.

6. The alkaline hydrogen production electrolyzer waste heat recovery system according to claim 1, characterized in that: The heating pipeline extends into the raw water tank and is arranged in a spiral shape.

7. The alkaline hydrogen production electrolyzer waste heat recovery system according to claim 1, characterized in that: The electrolytic hydrogen production device includes a plurality of alkali liquid coolers, and the plurality of alkali liquid coolers are respectively connected to the cooling water return pipeline and the cooling water supply pipeline.

8. The alkaline hydrogen production electrolyzer waste heat recovery system according to claim 1, characterized in that: The diameters of the cooling water return pipeline and the cooling water supply pipeline are both 350 mm.

9. The alkaline hydrogen production electrolyzer waste heat recovery system according to claim 1, characterized in that: The outdoor cooling device is a cooling tower.

10. A method for recovering waste heat from an electrolyzer for alkaline hydrogen production, characterized in that: The method is applied to the electrolyzer waste heat recovery and utilization system for alkaline hydrogen production as claimed in any one of claims 1 to 9, comprising: Obtain temperature information of cooling water return pipe and raw water tank; Compare the temperature difference between the cooling water return pipe and the inside of the raw water tank to obtain a second temperature comparison result; The opening and closing of the heating pipeline is controlled according to the second temperature comparison result.

11. The method for recovering waste heat from an electrolyzer for alkaline hydrogen production according to claim 10, characterized in that: The step of controlling the opening and closing of the heating pipeline according to the second temperature comparison result further includes: If the temperature of the cooling water return pipe is higher than the internal temperature of the raw water tank, turn on the heating pipe.

12. The method for recovering waste heat from an electrolyzer for alkaline hydrogen production according to claim 10, characterized in that: After obtaining the temperature information of the cooling water return pipe and the inside of the raw water tank, the method further includes: Compare the internal temperature of the raw water tank with the optimal operating water temperature of the pure water preparation system to obtain a first temperature comparison result; The opening and closing of the heating pipeline is controlled according to the first temperature comparison result.

13. The method for recovering waste heat from an electrolyzer for alkaline hydrogen production according to claim 12, characterized in that: The controlling the opening and closing of the first electric valve and the second electric valve according to the first temperature comparison result further includes: If the internal temperature of the raw water tank is lower than the optimum operating water temperature of the pure water preparation system, turn on the heating pipeline.

14. The method for recovering waste heat from an electrolyzer for alkaline hydrogen production according to claim 10, characterized in that: After controlling the opening and closing of the heating pipeline according to the second temperature comparison result, the method further includes: When the heating pipeline inside the raw water tank is turned on, the internal temperature of the raw water tank is monitored in real time; If the internal temperature of the raw water tank is 5°C higher than the optimum operating water temperature of the pure water preparation system, turn off the heating pipeline.

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