Electrolytic bath waste heat recycling system applied to alkaline hydrogen production

Abstract

The utility model provides an electrolytic bath waste heat recycling system applied to alkaline hydrogen production, which is characterized in that an electrolytic hydrogen production device is circularly communicated with an outdoor cooling device 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 raw water tank is communicated with the pure water preparation system for supplying water for pure water preparation. 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 utility model relates to electrolytic water hydrogen production waste heat recovery technical field especially relates to a kind of applied in alkaline hydrogen production electrolytic cell waste heat recovery and utilization system. BACKGROUND

[0002] Currently, hydrogen is prepared by renewable energy in industry, water is generally electrolyzed by electrolytic cell, and the type of electrolytic cell is mainly alkaline electrolytic cell (i.e. alkaline electrolytic water hydrogen production).

[0003] However, in the electrolytic cell waste heat recovery and utilization system of alkaline hydrogen production, a large amount of heat is released when the electrolytic cell is running, which needs to be taken away by cooling water, which will waste a large amount of heat, which is not conducive to energy saving and environmental protection. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of applied in alkaline hydrogen production electrolytic cell waste heat recovery and utilization system, to effectively utilize the heat dissipated in the working process of electrolytic hydrogen production device, reduce system overall energy consumption, the electrolytic cell waste heat recovery and utilization system applied in alkaline hydrogen production includes: electrolytic hydrogen production device, raw water tank, pure water preparation system, outdoor cooling device, cooling water return pipeline, cooling water supply pipeline and heating pipeline, wherein:

[0005] The electrolytic hydrogen production device is circularly communicated with the outdoor cooling device by the cooling water return pipeline and the cooling water supply pipeline, and the electrolytic hydrogen production device transmits heat to the outdoor cooling device by the cooling chamber return pipeline, and then releases to outdoor environment;The water inlet and water outlet of the heating pipeline are communicated in the cooling water return pipeline, and the middle section of the heating pipeline is arranged in 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, to improve the temperature in the raw water tank, and the raw water tank is communicated with the pure water preparation system for water supply for pure water preparation.

[0006] In specific implementation, the electrolytic cell waste heat recovery and utilization system applied in alkaline hydrogen production further includes control circuit, first electric valve and second electric valve, wherein:

[0007] The first electric valve is arranged at the water inlet of the heating pipeline, and is electrically communicated with the control circuit;The second electric valve is arranged in the cooling water return pipeline, between the water inlet and the water outlet of the heating pipeline, and is electrically communicated with 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 specific implementation, the electrolytic tank waste heat recycling system applied to alkaline hydrogen production further comprises a first temperature sensor and a second temperature sensor, wherein:

[0010] The first temperature sensor is arranged on the cooling water return pipeline and located before the water inlet of the heating pipeline, and is in electrical communication with the control circuit; the second temperature sensor is arranged inside the raw water tank and is in electrical communication with the control circuit.

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

[0012] In specific implementation, the electrolytic tank waste heat recycling system applied to alkaline hydrogen production further comprises a first pressure detector and a second pressure detector, wherein:

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

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

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

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

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

[0018] In specific implementation, the pipe diameter of the cooling water return pipeline and the cooling water supply pipeline is 350 mm.

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

[0020] The utility model provides a kind of electrolytic cell waste heat recycling system applied to alkaline hydrogen production, including electrolytic hydrogen production device, raw water tank, pure water preparation system, outdoor cooling device, cooling water return pipeline, cooling water supply pipeline and heating pipeline, wherein: electrolytic hydrogen production device and outdoor cooling device are circulated intercommunication by cooling water return pipeline and cooling water supply pipeline, electrolytic hydrogen production device is transmitted to outdoor cooling device by cooling chamber return water pipeline Heat, and then release to outdoor environment;The water inlet and water outlet of heating pipeline are communicated in cooling water return pipeline, and the middle section of heating pipeline is arranged in raw water tank, and cooling water heated by electrolytic hydrogen production device is obtained by the water inlet of heating pipeline from cooling water return pipeline, to improve the temperature in raw water tank, and raw water tank and pure water preparation system are communicated for water supply for pure water preparation.The electrolytic cell waste heat recycling system applied to alkaline hydrogen production is provided with heating pipeline that can be inserted into raw water tank in cooling water return pipeline, so that the heat emitted by electrolytic hydrogen production device is introduced into raw water tank, and the heat originally emitted to outdoor environment is used to heat raw water in raw water tank.The system can effectively utilize waste heat and reduce overall energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some specific embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0022] Figure 1 It is the structural schematic diagram of electrolytic cell waste heat recycling system applied to alkaline hydrogen production in one specific embodiment of the utility model.

[0023] Explanation of reference signs:

[0024] 100-electrolytic 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. Specific embodiments

[0025] For the purpose, technical scheme and advantages of the specific embodiment of the utility model, the specific embodiment of the utility model is further explained in detail below in combination with the drawings. Here, the illustrative specific embodiment and the explanation thereof are used to explain the utility model, but not as the limitation of the utility model.

[0026] As shown in Figure 1 The utility model provides a kind of electrolytic cell waste heat recycling system applied to alkaline hydrogen production, to effectively utilize the heat dissipated in the working process of electrolytic hydrogen production device 100, reduce the overall energy consumption of system, the electrolytic cell waste heat recycling system applied to alkaline hydrogen production includes electrolytic hydrogen production device 100, raw water tank 200, pure water preparation system 800, outdoor cooling device 300, cooling water return pipeline 400, cooling water supply pipeline 500 and heating pipeline 600, wherein:

[0027] Electrolytic hydrogen production device 100 and the outdoor cooling device 300 are connected by the cooling water return pipeline 400 and the cooling water supply pipeline 500, and the electrolytic hydrogen production device 100 transmits heat to the outdoor cooling device 300 by the cooling chamber return water pipeline, and then releases to outdoor environment;The water inlet and water outlet of the heating pipeline 600 are communicated with the cooling water return pipeline 400, and the middle section of the heating pipeline 600 is arranged in the raw water tank 200;The heating pipeline 600 obtains cooling water heated by the electrolytic hydrogen production device 100 through the water inlet from the cooling water return pipeline 400, to improve the temperature inside the raw water tank 200, and the raw water tank 200 is communicated with the pure water preparation system 800 for water supply for pure water preparation.

[0028] In specific implementation, as shown in Figure 1 To effectively control the heating of raw water in raw water tank 200 by heating pipeline 600, improve heating efficiency and accuracy, the electrolytic cell waste heat recycling system applied to alkaline hydrogen production can also include control circuit 700, first electric valve 610 and second electric valve 410, wherein:

[0029] The first electric valve 610 is arranged near the water inlet of the heating pipeline 600 and is electrically connected to the control circuit 700;The second electric valve 410 is arranged in 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.

[0030] The control circuit 700 is used to control the opening and closing of the first electric valve 610 and the second electric valve 410.

[0031] In specific implementation, as shown in Figure 1As shown, in order to effectively obtain the temperature of the cooling water return pipeline 400 and the raw water in the raw water tank 200, and further control the heating temperature of the raw water in the raw water tank 200, the electrolytic cell waste heat recycling system applied to the alkaline hydrogen production can also include a first temperature sensor 420 and a second temperature sensor 210, wherein:

[0032] The first temperature sensor 420 is arranged on the cooling water return pipeline 400 before the water inlet of the heating pipeline 600 and is in electrical communication with the control circuit 700; the second temperature sensor 210 is arranged inside the raw water tank 200 and is in electrical communication with the control circuit 700;

[0033] The control circuit 700 is also used to obtain the 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.

[0034] In specific implementation, as shown in the figure, Figure 1 In order to effectively monitor the pressure in the cooling water return pipeline 400, and further confirm whether the heating management is blocked according to the pressure, and improve the heating accuracy, the electrolytic cell waste heat recycling system applied to the alkaline hydrogen production can also include a first pressure detector 430 and a second pressure detector 440, wherein:

[0035] The first pressure detector 430 is arranged on the cooling water return pipeline 400 before the water inlet of the heating pipeline 600; the second pressure detector 440 is arranged on the cooling water return pipeline 400 after the water outlet of the heating pipeline 600;

[0036] The first pressure detector 430 and the second pressure detector 440 both have a pressure display.

[0037] In specific implementation, in order to facilitate the maintenance of the heating management 600 and the raw water tank 200, manual valves are arranged near the water inlet and the water outlet of the heating pipeline 600; manual valves are arranged on the water inlet pipe and the water outlet pipe of the raw water tank 200.

[0038] In specific implementation, the heating pipeline 600 can have various implementation schemes, for example, as shown in the figure, Figure 1 In order to effectively improve the heating efficiency, the heating pipeline 600 is arranged in a spiral shape inside the raw water tank 200.

[0039] In specific implementation, the electrolytic hydrogen production device 100 includes a plurality of alkali coolers 110, and the plurality of alkali coolers 110 are respectively connected to the cooling water return pipeline 400 and the cooling water supply pipeline 500.

[0040] In the embodiment, the outdoor cooling device 300 can have various embodiments. For example, the outdoor cooling device 300 can be a cooling tower because the cooling tower has a superior cooling effect.

[0041] In the embodiment, the pipe diameter of the cooling water return pipeline 400 and the cooling water supply pipeline 500 can have various embodiments when being set. For example, the low-temperature cooling water enters the lye cooler, absorbs heat, enters the outdoor cooling tower, and is cooled by heat exchange with outdoor air to become low-temperature cooling water, and then enters the lye cooler to absorb heat, and so on. The flow rate and flow velocity of the cooling water need to be matched with the lye cooler. The total heat Q that needs to be taken away in the lye cooler can be calculated according to the specific heat of water, the supply water temperature and the return water temperature, and the total flow rate L of the cooling water can be calculated as L=0.86Q / (Tsupply-Treturn) cubic meters / hour. Further, the flow velocity V of the cooling water is selected as V=1.2 m / s, and the pipe diameter of the cooling water return pipeline 400 and the cooling water supply pipeline 500 can be selected.

[0042] Specifically, the calculation formula of the pipe diameter of the cooling water return pipeline 400 and the cooling water supply pipeline 500 can be determined according to the following manner:

[0043] First, the relationship among the flow rate L, the flow velocity V and the pipe cross-sectional area A is:

[0044] L=V×A;

[0045] For a circular pipe, the pipe cross-sectional area A can be calculated by the radius r (or the diameter D, where D=2r):

[0046]

[0047] Substituting the expression of the cross-sectional area A into the flow rate formula, the following formula can be obtained:

[0048]

[0049] The diameter D can be solved by transforming the above formula:

[0050]

[0051] In summary, a formula for calculating the pipe diameter D according to the flow rate L and the flow velocity V can be obtained.

[0052] Further, the cooling water flow rate L=430 cubic meters / hour is known, and the flow rate L needs to be converted to m / s to match the flow velocity unit. 3 / s.

[0053]

[0054] The flow rate V = 1.2 m / s.

[0055] According to the aforementioned formula The pipe diameter D is calculated as follows:

[0056]

[0057] D ≈ 0.343 m;

[0058] Therefore, the pipe diameter is 0.343 meters, i.e. 343 millimeters. In practical applications, a 350 pipe with a diameter close to 343 millimeters can be used as the cooling water return pipe 500 and the cooling water supply pipe 500.

[0059] In one specific embodiment, taking a scale of 100 million cubic meters of hydrogen per year as an example, and assuming that the equipment produces hydrogen for 7000 hours per year, 15 caustic electrolytic cells with a hydrogen production capacity of 100 cubic meters per hour are required; according to the current efficiency of 65% of the electrolytic cell, the heat load of the 15 electrolytic cells is 2500 kW in total; if the heat is completely discharged by the cooling tower arranged outdoors, the cooling water required is L = 430 cubic meters per hour (calculated according to L = 0.86Q / (Tsupply-Treturn) cubic meters per hour, where Tsupply-Treturn = 5°); according to the current system efficiency of 40% of the pure water preparation system with a make-up water temperature of 20 degrees, the make-up water amount is 3.003 cubic meters per hour, and according to the system efficiency of 60% of the pure water preparation system with a make-up water temperature of 25 degrees, the make-up water amount is 2.002 cubic meters per hour. It can be seen that after using the waste heat utilization system, the make-up water as raw material can be saved by (3003-2002) / 3003 = 33.33%.

[0060] In one specific implementation, the application of the electrolytic cell waste heat recovery and utilization system for alkaline hydrogen production is as follows:

[0061] 1. The electrolytic cell of the electrolytic hydrogen production device 100 produces hydrogen, and during this process, heat is continuously dissipated, and the heat is carried to the caustic solution cooler 110 by the hydrogen / oxygen entrained caustic solution. The cooling water supply temperature is generally 20-30°C, and after absorbing heat in the caustic solution cooler 110, the temperature is generally 25-35°C, becoming high-temperature cooling water return;

[0062] 2. Detect the valve state of the waste heat recovery and utilization system: ensure that the first electric valve 610 is open and the second electric valve 410 is closed;

[0063] 3. Detecting 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 indicates 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 indicates that the heating pipeline 600 in the raw water tank 200 is blocked, and the manual valves at the water inlet and outlet of the raw water tank 200 and the manual valves near the water inlet and outlet of the heating pipeline 600 need to be manually closed, and then the heating pipeline 600 in the water tank is repaired, and the four manual valves are opened after the repair is completed.

[0064] 4. Detecting the water temperature in the raw water tank 200: according to the temperature signal obtained by 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 (25℃) of the pure water preparation system, the raw water does not need to be heated, the first electric valve 610 is closed and the second electric valve 410 is opened, and the high-temperature cooling water return directly enters 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, the original electric valve state is maintained.

[0065] 5. Detecting the cooling water return temperature and the temperature in the raw water tank 200: if the cooling water return temperature is less than or equal to the temperature in the raw water tank 200, the cooling water return cannot heat the raw water, the first electric valve 610 is closed and the second electric valve 410 is opened, and the cooling water return directly enters the outdoor cooling device 300 for heat dissipation; if the cooling water return temperature is greater than the temperature in the raw water tank 200, the original electric valve state is maintained, the high-temperature cooling water enters the raw water tank 200, and the heat is transmitted to the raw water through the heating pipeline 600, and the temperature of the raw water is increased.

[0066] 6. The water temperature in the raw water tank 200 cannot be too high: the optimal operating temperature of the pure water preparation system is 25℃, and if the cooling water return temperature is too high, it may cause the raw water temperature to be too high; the upper limit of the raw water temperature is set to be 5℃ higher than the optimal temperature, 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℃, the cooling water return continues 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℃, the first electric valve 610 is closed and the second electric valve 410 is opened, and the high-temperature cooling water return directly enters the outdoor cooling device 300 for heat dissipation.

[0067] 7. The above-mentioned temperature and pressure are all connected to the control circuit 700, and the interlocking is completed in the control circuit 700; the steps 1-6 are cycled to complete the process of discharging the heat of the electrolytic tank to the raw water temperature.

[0068] In summary, the electrolytic cell waste heat recycling system applied to alkaline hydrogen production provided by the utility model, including electrolytic hydrogen production device 100, raw water tank 200, pure water preparation system 800, outdoor cooling device 300, cooling water return pipeline 400, cooling water supply pipeline 500 and heating pipeline 600, wherein: electrolytic hydrogen production device 100 and outdoor cooling device 300 are connected through cooling water return pipeline 400 and cooling water supply pipeline 500, electrolytic hydrogen production device 100 transmits heat to outdoor cooling device 300 through cooling chamber return water pipeline, and then releases to outdoor environment; the water inlet and water outlet of heating pipeline 600 are communicated with cooling water return pipeline 400, the middle section of heating pipeline 600 is arranged in the raw water tank 200, heating pipeline 600 obtains cooling water heated by electrolytic hydrogen production device 100 through water inlet from cooling water return pipeline 400, so as to improve the temperature of raw water tank 200, and raw water tank 200 is communicated with pure water preparation system 800 for water supply for pure water preparation. The electrolytic cell waste heat recycling system applied to alkaline hydrogen production sets heating pipeline 600 that can be inserted into the raw water tank 200 in cooling water return pipeline 400, so that the heat emitted by electrolytic hydrogen production device 100 is introduced into raw water tank 200, and the heat originally needed to be emitted to the outdoor environment is used to heat the raw water in raw water tank 200. The system can effectively utilize waste heat and reduce overall energy consumption.

[0069] The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above description is only a specific embodiment of the utility model, and is not used to limit the protection scope of the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An electrolyzer waste heat recovery system for use in alkaline hydrogen production, characterized by, include: Electrolytic hydrogen production device, raw water tank, pure water preparation system, outdoor cooling device, cooling water return pipeline, cooling water supply pipeline and heating pipeline, including: The electrolytic hydrogen production device and the outdoor cooling device are circulated 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 water return pipeline, and then releases it to the outdoor environment; the water inlet and 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 the cooling water heated by the electrolytic hydrogen production device from the cooling water return pipeline through the water inlet to increase the internal temperature of the raw water tank. The raw water tank is connected to the pure water preparation system for water supply for pure water preparation.

2. The system for recovering and utilizing waste heat of an electrolytic tank according to claim 1, wherein It also includes a control circuit, 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 system for recovering and utilizing waste heat of an electrolytic cell according to claim 2, wherein Also included are a first temperature sensor and a second temperature sensor, wherein: The first temperature sensor is arranged in the cooling water return pipe, before the water inlet of the heating pipe, 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 configured 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 system for recovering and utilizing waste heat of an electrolytic tank according to claim 2, wherein Also included are a first pressure detector and a second pressure detector, wherein: The first pressure detector is provided on the cooling water return pipe and is located before the water inlet of the heating pipe; the second pressure detector is provided on the cooling water return pipe and is located after the water outlet of the heating pipe; The first pressure detector and the second pressure detector both have a pressure display.

5. The system for recovering and utilizing waste heat of an electrolytic cell according to claim 4, wherein 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 system for recovering and utilizing waste heat of an electrolytic cell according to claim 1, wherein The heating pipeline extends into the raw water tank and is arranged in a spiral shape.

7. The system for recovering and utilizing waste heat of an electrolytic cell according to claim 1, wherein 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 system for recovering and utilizing waste heat of an electrolytic cell according to claim 1, wherein The diameters of the cooling water return pipeline and the cooling water supply pipeline are both 350 mm.

9. The system for recovering and utilizing waste heat of an electrolytic cell according to claim 1, wherein The outdoor cooling device is a cooling tower.

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