Water electrolysis hydrogen production heat utilization device system

Abstract

The utility model provides a heat utilization device system for hydrogen production through water electrolysis. The heat utilization device system for hydrogen production through water electrolysis comprises an alkali liquor waste heat recovery device, an alkali liquor heat storage heating device, an alkali liquor circulation pipeline and a waste heat water circulation pipeline. The alkali liquor waste heat recovery device and the alkali liquor heat storage heating device are connected through an alkali liquor circulating pipeline; the waste heat water circulation pipeline is connected with the alkali liquor waste heat recovery device; the alkali liquor heat storage heating device comprises a heat storage medium, a shell, an alkali liquor heat exchange tube and an electric heater; the heat storage medium, the alkali liquor heat exchange tube and the electric heater are arranged in the shell; and the electric heater is arranged on the outer side of the alkali liquor heat exchange tube. The water electrolysis hydrogen production heat utilization device system is reasonable in structural design, achieves the purposes of reducing cold start time, reducing power consumption and recycling waste heat, and is suitable for large-scale popularization and application.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic water hydrogen production technology field especially relates to a kind of electrolytic water hydrogen production heat utilization device system. BACKGROUND

[0002] With the development of new power system mainly based on new energy, and the popularization and application of green hydrogen, large-capacity electrolytic water hydrogen production devices powered by renewable energy such as photovoltaic are increasingly valued by people. However, renewable energy has characteristics such as intermittency, volatility and randomness, so the matching large-capacity hydrogen production device needs to be frequently started and stopped according to the power supply situation during actual operation.

[0003] The alkaline electrolytic water hydrogen production device that stops running will be in a hot start or cold start state according to the length of the start interval. Whether in hot start or cold start, the length of the start time is closely related to the length of time for the electrolyte to reach the required temperature. For electrolytic cells in hot standby state, the alkali solution will gradually decrease as the downtime extends, and when it drops below 50°C, it will cause the time of re-heating to be prolonged. For cold-start electrolytic cells, the main performance indicators of the device (gas production, gas purity, etc.) can only reach the design value quickly when the alkali solution reaches above 50°C. Due to the low initial alkali solution temperature (room temperature), the alkali solution needs to be gradually heated to 50°C by putting the electrolytic cell into operation (electrolysis of water generates heat at the same time), which takes a long time (usually about 1-1.5 hours), and the gas purity cannot meet the requirements during this process. Due to the long start-up time of the electrolytic cell, a large amount of electrical energy is wasted, and the effective utilization time of the equipment is also reduced.

[0004] Only part of the energy of the running alkaline electrolytic water hydrogen production device is converted into hydrogen and oxygen, and the rest is in the form of heat entering the alkali solution. To prevent the device from overheating, the existing technology removes heat from the alkaline electrolyte in the electrolytic cell, and the alkali solution is cooled by exchanging heat with cooling water. A large amount of cooling water is required. For large-scale alkaline electrolytic water hydrogen production equipment, the amount of heat generated increases with the increase in capacity, and the amount of cooling water required also increases, resulting in the loss of this part of heat and reducing the energy utilization efficiency of the entire system.

[0005] CN220579417U discloses an alkaline electrolytic water hydrogen production system, and a cold start improvement device for an alkaline electrolytic tank. The oil inlet of the first vacuum heat insulation storage tank is connected with the alkali outlet pipe of each alkali electrolytic tank in the water electrolysis gas-liquid separation system through a first pipeline. The oil outlet of the first vacuum heat insulation storage tank is connected with the alkali inlet pipe of each alkali electrolytic tank in the water electrolysis gas-liquid separation system through a second pipeline. An alkali main pump is installed on the first pipeline or the second pipeline. When the heat engine is shut down, the alkali in the process pipeline of the alkaline electrolytic tank and the water electrolysis gas-liquid separation system is pumped out and stored in the first vacuum heat insulation storage tank. When the alkaline electrolytic tank is started up, the alkali stored in the first vacuum heat insulation storage tank is sent back to the alkaline electrolytic tank. The problem of high power consumption during cold start of the alkaline electrolytic tank is solved, resource is saved, resource utilization is improved, the alkaline electrolytic tank can be better coupled with wind and solar power, and the dynamic performance of the alkaline electrolytic tank is improved. The main problems of the scheme include: ①the excess heat generated during operation of the alkaline electrolytic water hydrogen production device is wasted; ②more equipment is added, and the control difficulty is increased; and ③the gas in the system needs to be replaced with inert gas during shutdown.

[0006] CN218756068U discloses an electrolytic water hydrogen production system with waste heat recovery and utilization, which comprises an electrolytic tank, a first temperature detection element, a hydrogen side separator, an oxygen side separator, a heat exchanger, an electrolyte cooler, an electrolyte circulating pump and a waste heat utilization system. The hydrogen gas-liquid mixture outlet from the hydrogen side of the electrolytic tank enters the hydrogen side separator. The oxygen gas-liquid mixture outlet from the oxygen side of the electrolytic tank enters the oxygen side separator. The electrolyte separated from the hydrogen side and the oxygen side separators is combined and enters the heat exchanger to heat or cool the heat exchange medium, and then enters the electrolyte cooler. The electrolyte is pumped into the electrolyte inlet of the electrolytic tank by the electrolyte circulating pump. The on-off / flow of the heat exchange medium and the on-off / flow of the cooling medium are adjusted by the control valve or the variable frequency pump to more accurately and reliably control the temperature of the electrolyte and improve the energy efficiency of the system. Meanwhile, the heat exchanger and the electrolyte cooler adopt a double-pipe heat exchanger to solve the problem of corrosion of the waste heat utilization system equipment by high-temperature and high-pressure electrolyte. The device has the following problems: ①the alkaline electrolytic water hydrogen production device has a long start-up time in the cold start state, and a large amount of electric energy is wasted; and ②more system equipment is added, and the control difficulty is increased.

[0007] Therefore, it is of great significance to develop an electrolytic water hydrogen production heat utilization device system to make the electrolytic tank alkali temperature of the alkaline electrolytic water hydrogen production device reach the appropriate temperature as soon as possible, shorten the start-up time of the electrolytic tank, and improve the energy utilization rate. Practical new type

[0008] In view of the problems in the prior art, the electrolytic water hydrogen production heat utilization device system provided by the utility model through the reasonable setting of the lye heat accumulation heating device makes the lye rapidly heat up, greatly shortens the starting time of the electrolytic tank, and simultaneously sets the lye waste heat recovery device, recycles the waste heat, maximally reduces the system energy consumption, and improves the energy utilization efficiency of the whole electrolytic water hydrogen production system.

[0009] In order to achieve the purpose, the utility model adopts the following technical solutions:

[0010] The utility model provides a kind of electrolytic water hydrogen production heat utilization device system, the electrolytic water hydrogen production heat utilization device system includes lye waste heat recovery device, lye heat accumulation heating device, lye circulation pipeline and waste heat water circulation pipeline;

[0011] The lye waste heat recovery device and lye heat accumulation heating device are connected by lye circulation pipeline;The waste heat water circulation pipeline is connected with lye waste heat recovery device;

[0012] The lye heat accumulation heating device includes heat storage medium, shell, lye heat exchange pipe and electric heater;The heat storage medium, lye heat exchange pipe and electric heater are arranged in the inside of shell;The electric heater is arranged on the outside of lye heat exchange pipe.

[0013] The electrolytic water hydrogen production heat utilization device system provided by the utility model is provided with lye waste heat recovery device, and the excess heat of lye is recycled, so that the hydrogen production energy consumption of system is maximally reduced.

[0014] The electrolytic water hydrogen production heat utilization device system provided by the utility model is provided with lye heat accumulation heating device, and the lye heat accumulation heating device includes heat storage medium, shell, lye heat exchange pipe and electric heater;The heat storage medium, lye heat exchange pipe and electric heater are arranged in the inside of shell;The electric heater is arranged on the outside of lye heat exchange pipe, so that the temperature of lye in electrolytic tank of electrolytic water hydrogen production system can reach suitable temperature as soon as possible, the cold start time of electrolytic tank is shortened, and the invalid energy consumption in previous cold start is avoided.

[0015] Moreover, the electrolytic water hydrogen production heat utilization device system provided by the utility model can be better coupled with photoelectric system, and the dynamic performance of electrolytic tank is improved.

[0016] Preferably, the lye waste heat recovery device includes tube-shell heat exchanger.

[0017] In the lye waste heat recovery device provided by the utility model, lye can flow through shell side, and heat supply circulating water can flow through tube side;Or heat supply circulating water can flow through shell side, and lye can flow through tube side.

[0018] Preferably, the heat storage medium includes solid heat storage medium, liquid heat storage medium or solid-liquid phase change medium.

[0019] The solid heat storage medium can be the existing ceramic microbeads, salt, quartz sand or sintered material, etc.

[0020] Preferably, when the heat storage medium is a liquid heat storage medium, the lye heat storage heating device further comprises a heat storage medium circulation pipeline arranged outside the shell.

[0021] Preferably, a heat storage medium circulation pump is arranged on the heat storage medium circulation pipeline.

[0022] When the lye heat storage heating device is in a working state, the heat storage medium circulation pump is started to drive the liquid to be drawn out from the upper part of the lye heat storage heating device along the heat storage medium circulation pipeline and returned to the lye heat storage heating device from the lower part, which mainly plays a role of strengthening the heat exchange inside the lye heat storage heating device, so that the temperature distribution in the lye heat storage heating device is more uniform.

[0023] Preferably, the lye heat storage heating device further comprises an external thermal insulation layer.

[0024] Preferably, the external thermal insulation layer is arranged outside the shell, which can further prevent the heat loss of the lye and ensure the rapid heating of the lye.

[0025] Preferably, the lye circulation pipeline comprises a self-separation system liquid pipeline, a first lye heat storage heating branch pipeline, a second lye heat storage heating branch pipeline, a third lye heat storage heating branch pipeline, a first lye cooling branch pipeline, a second lye cooling branch pipeline and an electrolytic tank pipeline.

[0026] Preferably, a lye circulation pump is arranged on the self-separation system liquid pipeline.

[0027] Preferably, the lye circulation pump and the lye waste heat recovery device are connected through the first lye cooling branch pipeline.

[0028] The first lye valve and the second lye valve are sequentially arranged on the first lye cooling branch pipeline.

[0029] Preferably, the lye waste heat recovery device is connected with the second lye cooling branch pipeline.

[0030] Preferably, a third lye valve is arranged on the second lye cooling branch pipeline.

[0031] Preferably, the lye circulation pump and the lye heat storage heating device are connected through the first lye heat storage heating branch pipeline.

[0032] Preferably, a fourth lye valve is arranged on the first lye heat storage heating branch pipeline.

[0033] Preferably, the lye heat storage heating device is connected with a second lye heat storage heating branch pipeline.

[0034] Preferably, the second lye heat storage heating branch pipeline is connected with the first lye cooling branch pipeline through a third lye heat storage heating branch pipeline.

[0035] Preferably, a fifth lye valve is arranged on the third lye heat storage heating branch pipeline.

[0036] Preferably, the second lye heat storage heating branch pipeline is connected with a de-electrolytic cell pipeline.

[0037] Preferably, a sixth lye valve is arranged on the de-electrolytic cell pipeline.

[0038] Preferably, the waste heat water circulation pipeline comprises a lye cooler water inlet pipeline and a lye cooler water outlet pipeline.

[0039] Preferably, the lye cooler water inlet pipeline and the lye cooler water outlet pipeline are respectively connected with a lye waste heat recovery device.

[0040] The lye cooler water inlet pipeline can pass in heat supply return water; the heat supply return water is discharged to a heat supply system through the lye cooler water outlet pipeline after heat exchange in the lye waste heat recovery device.

[0041] Preferably, a first circulating water valve is arranged on the lye cooler water inlet pipeline.

[0042] Preferably, a second circulating water valve is arranged on the lye cooler water outlet pipeline.

[0043] The electrolytic water hydrogen production heat utilization device system can be applied to operation conditions including daily operation condition, load reduction to shutdown condition and warm-up condition.

[0044] The operation method in the daily operation condition comprises the following steps:

[0045] 1) open the first lye valve, the second lye valve and the third lye valve, and the first circulating water valve and the second circulating water valve; other valves are in a closed state;

[0046] 2) the lye from the hydrogen production circulating lye separation system is pressurized by a lye circulating pump, enters the lye waste heat recovery device through the first lye valve and the first lye cooling branch pipeline, leaves the lye waste heat recovery device after heat exchange with heat supply circulating water, and is sent to an electrolytic cell through the first lye valve, the second lye cooling branch pipeline and the de-electrolytic cell pipeline to carry out water electrolysis reaction;

[0047] 3) The temperature of the hot lye is about 80-90℃, and the temperature of the heat-exchanged lye is about 65-70℃; when the heat-supply circulating water is the primary network circulating system, the temperature of the heat-supply return water entering the lye waste heat recovery device is about 55-60℃, and the temperature of the heat-supply return water flowing out of the lye waste heat recovery device is about 75-85℃; when the heat-supply circulating water is the direct heat-supply circulating system, the temperature of the heat-supply return water entering the lye waste heat recovery device is about 30-45℃, and the temperature of the heat-supply return water flowing out of the lye waste heat recovery device is about 45-60℃.

[0048] The operation method of the load-reduction-to-shutdown working condition comprises:

[0049] 1) closing the first lye valve, and closing the first circulating water valve or the second circulating water valve, while the second lye valve and the third lye valve remain in the open state;

[0050] 2) opening the fourth lye valve and the fifth lye valve;

[0051] 3) the lye from the self-made hydrogen lye circulating lye separation system is pressurized by the lye circulating pump, and then enters the lye heat storage heating device via the fourth lye valve and the first lye heat storage heating branch pipeline, so that the heat is transferred to the heat storage medium via the internal lye heat exchange pipe, and the temperature of the heat storage medium rises. The cooled lye then enters the lye waste heat recovery device via the second lye heat storage heating branch pipeline, the third lye heat storage heating branch pipeline and the first lye cooling branch pipeline to continue cooling and recovering waste heat; the first circulating water valve or the second circulating water valve is adjusted so that the lye going to the electrolytic cell is at a suitable working temperature. When the heat storage medium in the lye heat storage heating device no longer rises, the fourth lye valve and the fifth lye valve can be closed, and the waste heat recovery working state is switched to;

[0052] 4) when completely shutdown, the first circulating water valve and the second circulating water valve are closed; the lye circulating pump is gradually stopped.

[0053] The operation method of the warm-up working condition comprises:

[0054] 1) the first circulating water valve or the second circulating water valve remains in the closed state, while the first lye valve, the second lye valve, the third lye valve and the fifth lye valve remain in the closed state;

[0055] 2) the fourth lye valve and the sixth lye valve are opened;

[0056] 3) the lye circulating pump is started, and the lye enters the lye heat storage heating device via the fourth lye valve and the first lye heat storage heating branch pipeline, absorbs heat from the heat storage medium via the lye heat exchange pipe, and the temperature of the lye rises. The heated lye goes to the electrolytic cell, and then returns to the separation system liquid pipeline after being separated from the lye separation frame to continue the cycle of heating;

[0057] 4) When the alkali liquid temperature rising speed gradually slows down, open the electric heater of the alkali liquid heat storage heating device;

[0058] 5) When the alkali liquid temperature rises to 50℃, open the power supply of the electrolytic water system and close the power supply of the electric heater; hydrogen and oxygen begin to be generated in the electrolytic cell, and the alkali liquid temperature further rises;

[0059] 6) When the alkali liquid temperature rises to above 65℃, close the fourth alkali liquid valve and the sixth alkali liquid valve; open the first alkali liquid valve, the second alkali liquid valve and the third alkali liquid valve to realize the temperature rising of the alkali liquid waste heat recovery device body;

[0060] 7) When the alkali liquid temperature rises to above 80℃ again, gradually open the first circulating water valve and the second circulating water valve, and control the flow to make the alkali liquid to the electrolytic cell at a suitable working temperature.

[0061] 8) Finally, enter the normal running state.

[0062] The electrolytic water hydrogen production heat utilization device system provided by the utility model can also be used in the case that the unit needs to be stopped for a short time. That is, when the temporary stop is planned in advance, the alkali liquid heat is stored in the alkali liquid heat storage heating device in advance, and the heat exchange of the heat supply circulating water is stopped; if the stop time is relatively long, the system dissipates more heat so that the alkali liquid temperature is lower than the suitable working temperature, the alkali liquid temperature is first raised to above 65℃ by absorbing the heat storage in the alkali liquid heat storage heating device, and then the power supply of the electrolytic water system is opened to carry out the electrolysis reaction.

[0063] Compared with the prior art, the utility model has at least the following beneficial effects:

[0064] (1) The electrolytic water hydrogen production heat utilization device system provided by the utility model can realize the recovery of the excess heat and be used for heat supply through the waste heat recovery device, so that the hydrogen production energy consumption of the system is maximally reduced; and the waste heat generated in the electrolytic water process can be stored and used for the warm-up of the cold start process of the electrolytic cell, so that the problem of large power consumption of the cold start of the alkaline electrolytic cell is solved, resources are saved, and the energy utilization rate is improved.

[0065] (2) The electrolytic water hydrogen production heat utilization device system provided by the utility model can make the electrolytic water hydrogen production system better coupled with the photoelectric system, and improve the dynamic performance of the electrolytic cell. BRIEF DESCRIPTION OF DRAWINGS

[0066] Figure 1 is the structure schematic view of the electrolytic water hydrogen production heat utilization device system provided in the specific embodiment one of the utility model.

[0067] Figure 2 is the structure schematic view of the alkali liquid heat storage heating device in the specific embodiment one of the utility model.

[0068] Figure 3 is the structure diagram of the lye heat storage heating device when the heat storage medium is liquid in the second embodiment of the utility model.

[0069] In the figure: 1-alkali solution waste heat recovery device; 2-alkali solution heat storage heating device; 2-1 heat storage medium; 2-2 shell; 2-3 lye heat exchange pipe; 2-4 electric heater; 2-5 outer insulation layer; 2-6 heat storage medium circulating pipeline; 2-7 heat storage medium circulating pump;

[0070] 3-alkali solution circulating pump;

[0071] 4-1 first separate system liquid pipe; 4-2 first lye heat storage heating branch pipe; 4-3 second lye heat storage heating branch pipe; 4-4 third lye heat storage heating branch pipe; 4-5 first lye cooling branch pipe; 4-6 second lye cooling branch pipe; 4-7 electrolytic cell pipe;

[0072] 5-1 lye cooler water inlet pipe; 5-2 lye cooler water outlet pipe;

[0073] V1-first lye valve; V2-second lye valve; V3-third lye valve; V4-fourth lye valve; V5-fifth lye valve; V6-sixth lye valve; V7-first circulating water valve; V8-second circulating water valve. Embodiment

[0074] The technical scheme of the utility model is further illustrated below by specific embodiments in combination with the drawings.

[0075] The utility model is further illustrated in detail below. However, the following examples are only simple examples of the utility model and do not represent or limit the protection scope of the utility model, and the protection scope of the utility model is subject to the patent claims.

[0076] It should be understood that, in the description of the present application, the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the present application, "a plurality of" means two or more, unless otherwise specified.

[0077] It should be noted that, in the description of the present application, unless otherwise specified and limited, the terms "set", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0078] Those skilled in the art should understand that the present application must include necessary pipelines, conventional valves and general pump equipment for realizing the complete process, but the above content does not belong to the main utility model point of the present application, and those skilled in the art can add layout by themselves based on process flow and equipment structure selection, and the present application does not make special requirements and specific limitations.

[0079] As a specific embodiment of the present application, an electrolytic water hydrogen production heat utilization device system is provided, and its structural schematic diagram is shown in Figure 1 As shown.

[0080] The electrolytic water hydrogen production heat utilization device system comprises an alkali solution waste heat recovery device 1, an alkali solution heat storage heating device 2, an alkali solution circulation pipeline and a waste heat water circulation pipeline.

[0081] The alkali solution waste heat recovery device 1 and the alkali solution heat storage heating device 2 are connected through the alkali solution circulation pipeline; the waste heat water circulation pipeline is connected with the alkali solution waste heat recovery device 1.

[0082] The structural schematic diagram of the alkali solution heat storage heating device 2 is shown in Figure 2 As shown.

[0083] The lye heat accumulation heating device 2 comprises a heat accumulation medium 2-1, a shell 2-2, a lye heat exchange pipe 2-3 and an electric heater 2-4; the heat accumulation medium 2-1, the lye heat exchange pipe 2-3 and the electric heater 2-4 are arranged inside the shell 2-2; and the electric heater 2-4 is arranged outside the lye heat exchange pipe 2-3.

[0084] The lye waste heat recovery device 1 is a tube-shell heat exchanger, lye flows through the shell side, and water flows through the tube side.

[0085] The heat accumulation medium 2-1 is a solid heat accumulation medium quartz sand.

[0086] The lye heat accumulation heating device 2 further comprises an external thermal insulation layer 2-5.

[0087] The external thermal insulation layer 2-5 is arranged outside the shell 2-2.

[0088] The lye circulating pipeline comprises a self-separation system liquid pipeline 4-1, a first lye heat accumulation heating branch pipeline 4-2, a second lye heat accumulation heating branch pipeline 4-3, a third lye heat accumulation heating branch pipeline 4-4, a first lye cooling branch pipeline 4-5, a second lye cooling branch pipeline 4-6 and an electrolytic tank pipeline 4-7.

[0089] The lye circulating pump 3 is arranged on the self-separation system liquid pipeline 4-1.

[0090] The lye circulating pump 3 and the lye waste heat recovery device 1 are connected through the first lye cooling branch pipeline;

[0091] The first lye valve V1 and the second lye valve V2 are arranged on the first lye cooling branch pipeline 4-5 in sequence.

[0092] The lye waste heat recovery device 1 is connected with the second lye cooling branch pipeline 4-6;

[0093] The third lye valve V3 is arranged on the second lye cooling branch pipeline 4-6.

[0094] The lye circulating pump 3 and the lye heat accumulation heating device 2 are connected through the first lye heat accumulation heating branch pipeline 4-2;

[0095] The fourth lye valve V4 is arranged on the first lye heat accumulation heating branch pipeline 4-2.

[0096] The lye heat accumulation heating device 2 is connected with the second lye heat accumulation heating branch pipeline 4-3;

[0097] The second lye heat accumulation heating branch pipeline 4-3 and the first lye cooling branch pipeline 4-5 are connected through the third lye heat accumulation heating branch pipeline 4-4.

[0098] The fifth lye valve V5 is arranged on the third lye heat storage heating branch pipeline 4-4;

[0099] The second lye heat storage heating branch pipeline 4-3 is connected with the de-electrolytic cell pipeline 4-7;

[0100] The sixth lye valve V6 is arranged on the de-electrolytic cell pipeline 4-7.

[0101] The waste heat water circulation pipeline comprises a lye cooler water inlet pipeline 5-1 and a lye cooler water outlet pipeline 5-2;

[0102] The lye cooler water inlet pipeline 5-1 and the lye cooler water outlet pipeline 5-2 are connected with the lye waste heat recovery device 1 respectively.

[0103] The first circulating water valve V7 is arranged on the lye cooler water inlet pipeline 5-1;

[0104] The second circulating water valve V8 is arranged on the lye cooler water outlet pipeline 5-2.

[0105] As the specific embodiment one of the utility model, the operation condition suitable for the above-mentioned electrolytic water hydrogen production heat utilization device system is also provided, including daily operation condition, load reduction to shutdown condition and warm-up condition;

[0106] The operation method under the daily operation condition comprises:

[0107] 1) the first lye valve V1, the second lye valve V2 and the third lye valve V3 and the first circulating water valve V7 and the second circulating water valve V8 are opened, and other valves are in the closed state;

[0108] 2) the lye from the hydrogen production circulating lye separation system liquid pipeline 4-1 is pressurized by the lye circulating pump 3, then enters the lye waste heat recovery device 1 through the first lye valve V1 and the first lye cooling branch pipeline 4-5, leaves the lye waste heat recovery device 1 after heat exchange with the heat supply circulating water, and goes to the electrolytic cell through the first lye valve V3, the second lye cooling branch pipeline 4-6 and the de-electrolytic cell pipeline 4-7 to carry out water electrolysis reaction;

[0109] 3) the temperature of the hot lye is about 80 DEG C ~ 90 DEG C, and the temperature of the heat-exchanged lye is about 65 DEG C ~ 70 DEG C; when the heat supply circulating water is a primary network circulating system, the temperature of the heat supply return water entering the lye waste heat recovery device 1 is about 55 DEG C ~ 60 DEG C, and the temperature of the heat supply return water flowing out of the lye waste heat recovery device 1 is about 75 DEG C ~ 85 DEG C; when the heat supply circulating water is a direct heat supply circulating system, the temperature of the heat supply return water entering the lye waste heat recovery device 1 is about 30 DEG C ~ 45 DEG C, and the temperature of the heat supply return water flowing out of the lye waste heat recovery device 1 is about 45 DEG C ~ 60 DEG C.

[0110] The operation method of the load reduction to shutdown working condition comprises:

[0111] 1) Close the first lye valve V1, and close the first circulating water valve V7 or the second circulating water valve V8, while the second lye valve V2 and the third lye valve V3 remain open;

[0112] 2) Open the fourth lye valve V4 and the fifth lye valve V5;

[0113] 3) The lye from the self-made hydrogen lye circulating lye separation system (not shown) is pressurized by the lye circulating pump 3, and then enters the lye heat storage heating device 2 through the fourth lye valve V4 and the first lye heat storage heating branch pipeline 4-2, and the heat is transferred to the heat storage medium 2-1 through the internal lye heat exchange pipe 2-3, and the temperature of the heat storage medium 2-1 rises. The cooled lye enters the lye waste heat recovery device 1 through the second lye heat storage heating branch pipeline 4-3, the third lye heat storage heating branch pipeline 4-4 and the first lye cooling branch pipeline 4-5, and continues to cool and recover waste heat; adjust the first circulating water valve V7 or the second circulating water valve V8, so that the lye to the electrolytic cell is at a suitable working temperature. When the heat storage medium 2-1 in the lye heat storage heating device 2 no longer rises, the fourth lye valve V4 and the fifth lye valve V5 can be closed, and switched to a waste heat recovery only working state;

[0114] 4) When completely shutdown, close the first circulating water valve V7 and the second circulating water valve V8; gradually stop the lye circulating pump 3.

[0115] The operation method of the warm-up working condition comprises:

[0116] 1) The first circulating water valve V7 or the second circulating water valve V8 remains closed, while the first lye valve V1, the second lye valve V2, the third lye valve V3 and the fifth lye valve V5 remain closed;

[0117] 2) Open the fourth lye valve V4 and the sixth lye valve V6;

[0118] 3) Start the lye circulating pump 3, and the lye enters the lye heat storage heating device 2 through the fourth lye valve V4 and the first lye heat storage heating branch pipeline 4-2, absorbs heat from the heat storage medium 2-1 through the lye heat exchange pipe 2-3, and the temperature of the lye rises. The heated lye goes to the electrolytic cell (not shown), and then returns to the separation system liquid pipeline 4-1 after being separated from the lye separation frame, and continues to circulate and heat;

[0119] 4) When the lye temperature rising speed gradually slows down, open the electric heater 2-4 of the lye heat storage heating device 2;

[0120] 5) When the temperature of the alkali solution rises to 50 DEG C, the power supply of the electrolytic water system is turned on, and the power supply of the electric heater 2-4 is turned off; hydrogen and oxygen begin to be generated in the electrolytic cell, and the temperature of the alkali solution further rises;

[0121] 6) When the temperature of the alkali solution rises to 65 DEG C or above, the fourth alkali solution valve V4 and the sixth alkali solution valve V6 are closed; the first alkali solution valve V1, the second alkali solution valve V2 and the third alkali solution valve V3 are opened, so that the temperature of the alkali solution in the alkali solution waste heat recovery device 1 is raised;

[0122] 7) When the temperature of the alkali solution rises to 80 DEG C or above again, the first circulating water valve V7 and the second circulating water valve V8 are gradually opened, and the flow rate is controlled so that the alkali solution to the electrolytic cell is at a suitable working temperature.

[0123] 8) Finally, the normal operation state is entered.

[0124] As a specific embodiment two of the utility model, provide a kind of heat storage device of electrolytic water hydrogen production heat utilization device system, its structural schematic diagram as shown in Figure 3 As shown in

[0125] The heat storage medium 2-1 is a liquid such as water or brine, and the alkali solution heat storage heating device 2 further includes a heat storage medium circulating pipeline 2-6 arranged outside the shell 2-2; the heat storage medium circulating pipeline 2-6 is provided with a heat storage medium circulating pump 2-7.

[0126] As a specific embodiment two of the utility model, the running condition suitable for the above-mentioned electrolytic water hydrogen production heat utilization device system is also provided, including daily running condition, load reduction to shutdown condition and warm-up condition; wherein the alkali solution heat storage heating device 2 is in working state, the heat storage medium circulating pump 2-7 is started, to drive the liquid to be drawn out from the upper part of the alkali solution heat storage heating device 2 along the heat storage medium circulating pipeline 2-6, and to return to the alkali solution heat storage heating device 2 from the lower part. Mainly play the role of strengthening heat exchange inside the heat storage device, so that the temperature distribution in the heat storage device is more uniform; other operation methods under various conditions are equivalent to the specific embodiment one.

[0127] As described above, the electrolytic water hydrogen production heat utilization device system provided by the utility model realizes the recovery of excess heat in the alkali solution and uses it for heating through the waste heat recovery device, maximally reduces the hydrogen production energy consumption of the system; through the heat storage heating device, the temperature of the alkali solution quickly reaches the appropriate temperature, the start-up time of the electrolytic cell is shortened, the power consumption is reduced, the energy utilization rate is improved, and it is suitable for large-scale popularization and application.

[0128] The applicant declares that the utility model is explained by the above-mentioned embodiments to illustrate the detailed structural features of the utility model, but the utility model is not limited to the above-mentioned detailed structural features, namely, it does not mean that the utility model must rely on the above-mentioned detailed structural features to be implemented. The skilled in the art should understand that any improvement of the utility model, equivalent replacement of the components selected by the utility model and increase of auxiliary components, selection of specific modes and the like all fall within the protection scope and the disclosure scope of the utility model.

[0129] The preferred embodiments of the utility model are described in detail above, but the utility model is not limited to the specific details in the above-mentioned embodiments, and various simple modifications can be made to the technical scheme of the utility model within the technical concept scope of the utility model, and these simple modifications all belong to the protection scope of the utility model.

Claims

1. A hydrogen production heat utilization device system for electrolysis of water, characterized by, The hydrogen production heat utilization device system comprises an alkali solution waste heat recovery device (1), an alkali solution heat storage heating device (2), an alkali solution circulation pipeline and a waste heat water circulation pipeline. The alkali solution waste heat recovery device (1) and the alkali solution heat storage heating device (2) are connected through the alkali solution circulation pipeline; the waste heat water circulation pipeline is connected with the alkali solution waste heat recovery device (1). The alkali solution heat storage heating device (2) comprises a heat storage medium (2-1), a shell (2-2), an alkali solution heat exchange pipe (2-3) and an electric heater (2-4); the heat storage medium (2-1), the alkali solution heat exchange pipe (2-3) and the electric heater (2-4) are arranged in the interior of the shell (2-2); the electric heater (2-4) is arranged outside the alkali solution heat exchange pipe (2-3).

2. The hydrogen production system using electrolysis of water heat utilization device according to claim 1, characterized in that, The alkali solution waste heat recovery device (1) comprises a shell-and-tube heat exchanger.

3. The hydrogen production system using electrolysis of water heat utilization device according to claim 1, characterized in that, The heat storage medium (2-1) comprises a solid heat storage medium, a liquid heat storage medium or a solid-liquid phase change medium. When the heat storage medium (2-1) is a liquid heat storage medium, the alkali solution heat storage heating device (2) further comprises a heat storage medium circulation pipeline (2-6) arranged outside the shell (2-2). A heat storage medium circulation pump (2-7) is arranged on the heat storage medium circulation pipeline (2-6).

4. The hydrogen production system of claim 1, wherein the hydrogen production system further comprises a heat utilization device. The alkali solution heat storage heating device (2) further comprises an external thermal insulation layer (2-5).

5. The hydrogen production system of claim 4, wherein the hydrogen production system further comprises a heat utilization device. The external thermal insulation layer (2-5) is arranged outside the shell (2-2).

6. The hydrogen production system of claim 1, wherein the hydrogen production system is a hydrogen production system for a thermal power plant. The alkali solution circulation pipeline comprises a self-separation system liquid pipeline (4-1), a first alkali solution heat storage heating branch pipeline (4-2), a second alkali solution heat storage heating branch pipeline (4-3), a third alkali solution heat storage heating branch pipeline (4-4), a first alkali solution cooling branch pipeline (4-5), a second alkali solution cooling branch pipeline (4-6) and a de-electrolytic cell pipeline (4-7).

7. The hydrogen production system of claim 6, wherein the hydrogen production system further comprises a heat utilization device. An alkali solution circulation pump (3) is arranged on the self-separation system liquid pipeline (4-1). 8.The hydrogen production system using electrolysis of water heat utilization device system according to claim 7, characterized in that, The alkali solution circulation pump (3) is connected with the alkali solution waste heat recovery device (1) through the first alkali solution cooling branch pipeline; First and second alkali solution valves (V1 and V2) are arranged on the first alkali solution cooling branch pipeline (4-5) in sequence. 9.The hydrogen production system using electrolysis of water heat utilization device system according to claim 6, characterized in that, The alkali solution waste heat recovery device (1) is connected with the second alkali solution cooling branch pipeline (4-6); A third alkali solution valve (V3) is arranged on the second alkali solution cooling branch pipeline (4-6); The alkali solution circulation pump (3) is connected with the alkali solution heat storage heating device (2) through the first alkali solution heat storage heating branch pipeline (4-2); A fourth alkali solution valve (V4) is arranged on the first alkali solution heat storage heating branch pipeline (4-2); The alkali solution heat storage heating device (2) is connected with the second alkali solution heat storage heating branch pipeline (4-3); The second alkali solution heat storage heating branch pipeline (4-3) is connected with the first alkali solution cooling branch pipeline (4-5) through the third alkali solution heat storage heating branch pipeline (4-4); A fifth alkali solution valve (V5) is arranged on the third alkali solution heat storage heating branch pipeline (4-4); The second alkali solution heat storage heating branch pipeline (4-3) is connected with the de-electrolytic cell pipeline (4-7). The sixth lye valve (V6) is arranged on the electrolytic cell pipeline (4-7). 10.The hydrogen production system using electrolysis of water and heat utilization device system according to claim 1, wherein, The waste heat water circulation pipeline comprises a lye cooler water inlet pipeline (5-1) and a lye cooler water outlet pipeline (5-2); The lye cooler water inlet pipeline (5-1) and the lye cooler water outlet pipeline (5-2) are connected with the lye waste heat recovery device (1) respectively; The first circulating water valve (V7) is arranged on the lye cooler water inlet pipeline (5-1). The second circulating water valve (V8) is arranged on the lye cooler water outlet pipeline (5-2).

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