CN114087904A - Electric hydrogen production waste heat utilization device and method - Google Patents

Electric hydrogen production waste heat utilization device and method Download PDF

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Publication number
CN114087904A
CN114087904A CN202111579958.7A CN202111579958A CN114087904A CN 114087904 A CN114087904 A CN 114087904A CN 202111579958 A CN202111579958 A CN 202111579958A CN 114087904 A CN114087904 A CN 114087904A
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valve
heat
heat storage
liquid
pipeline
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林今
戚若玫
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Tsinghua University
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Tsinghua University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
    • F28D20/0039—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material with stratification of the heat storage material
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/133—Renewable energy sources, e.g. sunlight

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Abstract

The present disclosure relates to an electrical hydrogen production waste heat utilization apparatus and method. According to the heat storage device, the heat storage device is arranged, the connecting pipeline and the valve for controlling the connection/disconnection of the corresponding pipeline are arranged between each interface of the heat storage device and each interface of the heat exchanger, the switchable heat storage loop and the heat release loop are formed between the heat storage device and the heat exchanger, so that the efficient electrolytic heat recycling is realized under the condition that the heat exchanger is not additionally arranged, the structure is simple, the realization cost is low, the integration is convenient, and the original device is not required to be greatly changed.

Description

Electric hydrogen production waste heat utilization device and method
Technical Field
The disclosure relates to the field of temperature control of an electrical hydrogen production system, in particular to an electrical hydrogen production waste heat utilization device and a waste heat utilization method adopting the device.
Background
The electric hydrogen production is an energy storage technology with great development prospect, and the surplus electric energy of renewable energy sources is converted into hydrogen or other fuels by utilizing an electrolysis device, so that the large-scale and long-time energy storage can be realized. Because the load level of the electric hydrogen production equipment fluctuates greatly along with the output of renewable energy sources in the whole day, the electrolytic heat production is coupled with the load level: when the load is high, the water cooler needs to be started to provide cooling for the electric hydrogen production system; at low loads, the heat generated by electrolysis is insufficient to maintain the equipment radiating, so that the temperature of the equipment is reduced, and the electrolysis efficiency and the dynamic performance are influenced.
Considering that a large amount of electrolysis waste heat exists under high load and a heat source is needed to maintain the temperature of the electrolysis equipment under low load, a heat storage system needs to be configured for the electric hydrogen production equipment to realize waste heat recovery and utilization. Chinese patent document CN 111748822 a relates to a comprehensive thermal management system for a large-scale alkaline water electrolysis hydrogen production device, which cools the alkaline solution in a high-temperature gas-liquid mixed state immediately after the alkaline solution flows out of an electrolytic cell, collects heat to a thermal management device, and heats the cold alkaline solution before the cold alkaline solution enters the electrolytic cell, thereby avoiding heat loss caused by the circulation of the hot alkaline solution in gas-liquid separation and alkaline solution pipelines. Although the patent tries to realize the recovery of electrolysis waste heat, the flow structure is complicated, and the total flow structure comprises four heat exchangers, so that the equipment cost is obviously increased in practical application, and the device is large in size and is very unfavorable for integration.
Disclosure of Invention
In view of this, the present disclosure provides a device with simple structure and low cost, and capable of efficiently recycling electrolysis heat, and also provides a waste heat utilization method using the device.
The utility model provides an electricity hydrogen manufacturing waste heat utilization equipment for electricity hydrogen manufacturing system, the device includes the heat-retaining equipment, the heat-retaining equipment includes heat-retaining main part, first cold liquid mouth and first hot liquid mouth:
the heat storage body is used for storing liquid;
the first cold liquid port is connected to a liquid inlet of a heat exchanger in a gas-liquid separator of the electrical hydrogen production system through a first pipeline, the first cold liquid port is also connected to a liquid outlet of the heat exchanger through a second pipeline, and the first cold liquid port is communicated with liquid at a first temperature in the heat storage main body;
the first hot liquid port is connected to the liquid inlet of the heat exchanger through a third pipeline, the first hot liquid port is connected to the liquid outlet of the heat exchanger through a fourth pipeline, the first hot liquid port is communicated with liquid at a second temperature in the heat storage main body, and the second temperature is higher than the first temperature;
the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are correspondingly provided with a first valve, a second valve, a third valve and a fourth valve so as to control the corresponding pipelines to be switched on or switched off.
Optionally, the apparatus further comprises a first circulation pump disposed on one of the first pipeline and the fourth pipeline, and a second circulation pump disposed on one of the second pipeline and the third pipeline.
Optionally, the apparatus further comprises a valve assembly connected in series between two nodes of a common line segment, the common line segment being a common portion of two of the first, second, third and fourth lines having a common interface, the valve assembly comprising a circulation pump and fifth, sixth, seventh and eighth valves, wherein:
the first end of the fifth valve and the first end of the sixth valve are connected to a liquid inlet of the circulating pump, and the first end of the seventh valve and the first end of the eighth valve are connected to a liquid outlet of the circulating pump;
a second end of the fifth valve and a second end of the seventh valve are connected to one of the two nodes, and a second end of the sixth valve and a second end of the eighth valve are connected to the other of the two nodes.
Optionally, the heat storage device is a constant pressure heat storage tank.
Optionally, the apparatus further comprises an external heating source, the heat storage device further comprises a second cold liquid port and a second hot liquid port, wherein:
the liquid inlet of the external heating source is connected with the second cold liquid port of the heat storage equipment, and the liquid outlet of the external heating source is connected with the second hot liquid port of the heat storage equipment to provide heat for the heat storage equipment.
Optionally, the apparatus further comprises an external cooling source, a liquid outlet of the external cooling source is connected to the liquid inlet of the heat exchanger through a fifth pipeline, and the liquid outlet of the heat exchanger is connected to the liquid inlet of the external cooling source through a sixth pipeline.
Optionally, a regulating valve is disposed on the fifth pipeline to regulate the flow of the liquid flowing from the external heat sink to the heat exchanger.
The present disclosure also provides a waste heat utilization method using the above apparatus, the method including:
opening the first valve and the fourth valve, and closing the second valve and the third valve, so that the liquid flowing out of the first cold liquid port of the heat storage equipment flows into the liquid inlet of the heat exchanger through the first pipeline, then flows out of the liquid outlet of the heat exchanger, and flows into the first hot liquid port of the heat storage equipment through the fourth pipeline, so as to set the electric hydrogen production waste heat utilization device in the heat storage state;
and closing the first valve and the fourth valve, and opening the second valve and the third valve, so that the liquid flowing out of the first hot liquid port of the heat storage equipment flows into the liquid inlet of the heat exchanger through the third pipeline, then flows out of the liquid outlet of the heat exchanger, and flows into the first cold liquid port of the heat storage equipment through the second pipeline, thereby setting the electric hydrogen production waste heat utilization device to be in the heat release state.
Optionally, the method further comprises:
when the heat storage device reaches the first heat storage condition but does not reach the second heat storage condition,
if the pre-bath temperature of the electrical hydrogen production system is lower than the preset pre-bath temperature, setting the electrical hydrogen production waste heat utilization device to be in the heat release state;
if the temperature in front of the electric hydrogen production system is higher than the preset temperature in front of the tank, setting the electric hydrogen production waste heat utilization device in the heat storage state;
wherein the second heat storage condition has a higher heat storage requirement than the first heat storage condition.
Optionally, the method further comprises:
when the heat storage device reaches the second heat storage condition,
if the pre-bath temperature of the electrical hydrogen production system is lower than the preset pre-bath temperature, setting the electrical hydrogen production waste heat utilization device to be in the heat release state;
if the temperature before the groove of the electrical hydrogen production system is higher than the preset temperature before the groove, the first valve, the second valve, the third valve and the fourth valve are closed, the heat exchanger is communicated with an external cold source, and the electrical hydrogen production system is cooled by the external cold source.
Optionally, the method further comprises:
and when the heat storage equipment does not reach the first heat storage condition, the heat storage equipment is communicated with an external heating source, and heat is provided for the heat storage equipment through the external heating source.
Optionally, the method further comprises:
when the heat storage device does not reach the first heat storage condition,
if the temperature before the tank is higher than the preset temperature before the tank, setting the electric hydrogen production waste heat utilization device in the heat storage state;
and if the tank front temperature is lower than the preset tank front temperature, closing the first valve, the second valve, the third valve and the fourth valve.
According to the heat storage device, the heat storage device is arranged, the connecting pipeline and the valve for controlling the connection/disconnection of the corresponding pipeline are arranged between each interface of the heat storage device and each interface of the heat exchanger, the switchable heat storage loop and the heat release loop are formed between the heat storage device and the heat exchanger, so that the efficient electrolytic heat recycling is realized under the condition that the heat exchanger is not additionally arranged, the structure is simple, the realization cost is low, the integration is convenient, and the original device is not required to be greatly changed.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 shows a schematic view of a conventional electrical hydrogen production system.
Fig. 2 shows a schematic structural diagram of an electrical hydrogen production waste heat utilization device for an electrical hydrogen production system according to an embodiment of the disclosure.
Fig. 3 shows a schematic structural diagram of an electrical hydrogen production waste heat utilization device according to an exemplary embodiment of the present disclosure.
Fig. 4 shows a schematic diagram of the electrical hydrogen production waste heat utilization device in a heat storage state according to an exemplary embodiment of the disclosure.
Fig. 5 shows a schematic diagram of the electrical hydrogen production waste heat utilization device according to an exemplary embodiment of the present disclosure in an exothermic state.
Fig. 6 shows the arrangement of the electrical hydrogen production waste heat utilization device according to the exemplary embodiment of the present disclosure in different states.
Fig. 7 shows a flowchart of a waste heat utilization method according to an exemplary embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
Fig. 1 shows a schematic view of a conventional electrical hydrogen production system. As shown in figure 1, the electric hydrogen production system mainly comprises an electrolytic bath and separated oxygen (O)2) Gas-liquid separator of (3), separating hydrogen gas (H)2) Gas-liquid separatorAnd a circulation pump PA. The electrolytic water reaction is generated in the electrolytic bath to generate hydrogen (H)2) And oxygen (O)2). The product gas is carried out of the electrolytic bath by the circulated alkali liquor and enters a gas-liquid separator. In the gas-liquid separator, the product gas is separated from the alkali liquor, and the gas leaves the electric hydrogen production system from the upper part of the gas-liquid separator and is utilized or stored by the subsequent links; the alkali liquor flows back to the electrolytic tank through the circulating pump.
In an electrical hydrogen production system, an electrolytic water reaction occurs in an electrolytic cell to generate hydrogen and oxygen as products, and the electrolytic reaction releases a large amount of heat. If the temperature in the electrolytic cell is too high, the diaphragm can be damaged; if the temperature in the electrolytic bath is too low, the efficiency of the electrolytic reaction is affected. The heat exchanger (such as a heat exchange coil) is arranged in the gas-liquid separator, the temperature of the alkali liquor in the gas-liquid separator is controlled by the heat exchanger, and the alkali liquor flows back to the electrolytic bath, so that the temperature of the electrolytic bath is indirectly controlled.
Fig. 2 shows a schematic structural diagram of an electrical hydrogen production waste heat utilization device for an electrical hydrogen production system according to an embodiment of the disclosure.
As shown in fig. 2, the apparatus includes a thermal storage tank including a thermal storage body 101, a first cold liquid port 102, and a first hot liquid port 103. The heat storage body 101 is used to store liquid. The first cold liquid port 102 is connected to a liquid inlet 104 of a heat exchanger in a gas-liquid separator of the electrohydrogen production system through a first pipeline, and the first cold liquid port 102 is also connected to a liquid outlet 105 of the heat exchanger through a second pipeline. The first cold liquid port 102 communicates with the liquid at the first temperature in the heat storage body 101.
The first hot liquid port 103 is connected to the liquid inlet 104 of the heat exchanger through a third pipeline, the first hot liquid port 103 is further connected to the liquid outlet 105 of the heat exchanger through a fourth pipeline, the first hot liquid port 103 is communicated with liquid at a second temperature in the heat storage body 101, and the second temperature is higher than the first temperature.
The first pipeline, the second pipeline, the third pipeline and the fourth pipeline are correspondingly provided with a first valve V1, a second valve V2, a third valve V3 and a fourth valve V4 so as to control the corresponding pipelines to be switched on or switched off.
In one example, the heat storage device may adopt a constant pressure heat storage tank, which stores heat by using liquid temperature change, the hot liquid with lower density floats on the upper tank area, and the cold liquid with higher density gathers on the lower tank area, so that natural layering of the hot liquid and the cold liquid is realized.
In one example, the first valve V1, the second valve V2, the third valve V3, and the fourth valve V4 may each employ a shut-off valve.
Based on the above embodiment, the heat storage loop of the electrical hydrogen production system can be formed by opening (i.e., conducting) the first valve V1 and the fourth valve V4, and closing (i.e., not conducting) the second valve V2 and the third valve V3; the first valve V1 and the fourth valve V4 are closed, and the second valve V2 and the third valve V3 are opened, so that a heat release loop of the electrical hydrogen production system can be formed, efficient electrolytic heat recycling is realized under the condition that a heat exchanger is not additionally arranged, the structure is simple, the realization cost is low, the integration is convenient, and the original equipment does not need to be greatly changed.
In one possible embodiment, the apparatus may include a first circulation pump provided on one of the first and fourth lines and a second circulation pump provided on one of the second and third lines.
As described above, the first pipeline and the fourth pipeline may form a heat storage loop, the second pipeline and the third pipeline may form a heat release loop, and the first circulation pump may overcome a pressure drop of the heat storage loop, thereby stably and reliably achieving a liquid circulation of the heat storage loop; the second circulating pump can overcome the pressure drop of the heat release loop and stably and reliably realize the liquid circulation of the heat release loop.
In another possible embodiment, the device further comprises a valve assembly connected in series between two nodes of a common line section, the common line section being a common portion of two lines of the first, second, third and fourth lines having a common interface, the valve assembly comprising a circulation pump and fifth, sixth, seventh and eighth valves, wherein:
the first end of the fifth valve and the first end of the sixth valve are connected to a liquid inlet of the circulating pump, and the first end of the seventh valve and the first end of the eighth valve are connected to a liquid outlet of the circulating pump;
a second end of the fifth valve and a second end of the seventh valve are connected to one of the two nodes, and a second end of the sixth valve and a second end of the eighth valve are connected to the other of the two nodes.
As can be seen from the above connection of the first, second, third and fourth pipelines, the first and second pipelines have a common interface-the first cold liquid port 102 of the heat exchange device, the first and third pipelines have a common interface-the inlet 104 of the heat exchanger, the second and fourth pipelines have a common interface-the outlet 105 of the heat exchanger, and the third and fourth pipelines have a common interface-the first hot liquid port 103 of the heat exchange device, so that the first and second pipelines may have a common pipeline section near the first cold liquid port 102, the first and third pipelines may have a common pipeline section near the inlet 104 of the heat exchanger, the second and fourth pipelines may have a common pipeline section near the outlet 105 of the heat exchanger, and the third and fourth pipelines may have a common pipeline section near the first hot liquid port 103. According to this disclosed connected mode, two passageways that have public pipeline section just are in respectively in heat release circuit and heat-retaining circuit, adopt according to the valve assembly of this example, can be according to the flow direction of current return circuit, through opening/close different valves, make the circulating pump insert the return circuit with corresponding direction for only need a circulating pump, just can both act on heat release circuit, also act on heat-retaining circuit, saved installation cost and volume.
In a possible implementation manner, the apparatus further includes an external heating source, a liquid inlet of the external heating source is connected with the second cold liquid port of the heat storage device, and a liquid outlet of the external heating source is connected with the second hot liquid port of the heat storage device to provide heat for the heat storage device.
In the existing waste heat utilization system such as CN 111748822 a, when the heat storage of the heat storage device is insufficient, the thermal management system cannot maintain the proper electrolysis temperature. According to the electric hydrogen production waste heat utilization device of the embodiment, heat can be provided for the heat storage equipment through the external heating source, so that when the heat storage of the heat storage equipment is insufficient, heat can be supplemented quickly, and the electrolysis temperature can be maintained stably. In addition, the external heating source is directly connected with the heat storage equipment, so that the flexibility provided by the heat storage tank can be more fully utilized, such as early heat storage at the valley power moment and the like.
The external heat source can adopt a heat pump or an electric heater.
In a possible embodiment, the apparatus further comprises an external cooling source, an outlet of the external cooling source is connected to the liquid inlet 104 of the heat exchanger through a fifth pipeline, and the liquid outlet 105 of the heat exchanger is connected to the liquid inlet of the external cooling source through a sixth pipeline.
In the existing waste heat utilization system such as CN 111748822 a, when the cold storage of the heat storage device is insufficient, the thermal management system cannot maintain the proper electrolysis temperature. According to the electric hydrogen production waste heat utilization device, the external cold source is connected with the heat storage equipment in parallel, so that when the cold storage of the heat storage equipment is insufficient, the external cold source is rapidly switched to refrigerate the electrolytic cell, and the electrolysis temperature is stably maintained.
The external cold source can adopt a water cooler.
In one example, the fifth pipeline is provided with a regulating valve to regulate the liquid flow from the external cooling source to the heat exchanger, so that more flexible and accurate temperature control is realized. The regulating valve can adopt a membrane regulating valve and the like.
In some examples, a stop valve may be further disposed on the fifth pipeline to ensure that it is disconnected when no external cold source is needed.
In some examples, the passage provided for the liquid inside the external cooling source, such as a water chiller, can be regarded as a pipeline communicating the fifth pipeline and the sixth pipeline, in which case, no additional valve is required to be arranged on the sixth pipeline.
Fig. 3 shows a schematic structural diagram of an electrical hydrogen production waste heat utilization device according to an exemplary embodiment of the present disclosure.As shown, a valve assembly as described above is connected in series on a common line section of the first and second lines. Wherein a first end of the fifth valve V5 and a first end of the sixth valve V6 are connected to the circulation pump PBA first end of the seventh valve V7 and a first end of the eighth valve V8 are connected to the circulation pump PBA second end of the fifth valve V5 and a second end of the seventh valve V7 are connected to a node near the first cold liquid port 102, and a second end of the sixth valve V6 and a second end of the eighth valve V8 are connected to another node of the common line segment.
Illustratively, the valves V1-V8 are all stop valves.
The heat pump 106 is used as an external heat source, and a liquid inlet 109 and a liquid outlet 110 of the heat pump are respectively connected with a second cold liquid port 107 and a second hot liquid port 108 of the heat storage device.
The water cooler 111 as an external cold source is connected in parallel with the heat storage device, and a fifth pipeline connected to the liquid inlet 104 of the gas-liquid separator is provided with a membrane regulating valve V9 and a stop valve V10.
The first valve and the fourth valve of the device are opened, the second valve and the third valve are closed, so that the liquid flowing out of the first cold liquid port 102 of the heat storage equipment flows into the liquid inlet 104 of the heat exchanger through the first pipeline, then flows out of the liquid outlet 105 of the heat exchanger, and flows into the first hot liquid port 103 of the heat storage equipment through the fourth pipeline, and the device for utilizing the residual heat of the electric hydrogen production can be in a heat storage state.
The first valve and the fourth valve are closed, and the second valve and the third valve are opened, so that the liquid flowing out of the first hot liquid port 103 of the heat storage device flows into the liquid inlet 104 of the heat exchanger through the third pipeline, then flows out of the liquid outlet 105 of the heat exchanger, and flows into the first cold liquid port 102 of the heat storage device through the second pipeline, and the electric hydrogen production waste heat utilization device can be in a heat release state.
Fig. 4 shows a schematic diagram of the electrical hydrogen production waste heat utilization device in a heat storage state according to an exemplary embodiment of the disclosure, and disconnected or bypassed pipes and equipment are not shown for clarity of illustration.
As shown in the figure, in the heat storage state, cold water at about 50 ℃ at the bottom of the heat storage tank enters the heat exchanger through valves V5, V8 and V1, is heated to about 80 ℃, then flows back to the top of the heat storage tank through a valve V4, and is circulated by a circulating pump PBProviding cold liquid circulation power and controlling the liquid flow. The alkali liquor at the outlet of the electrolytic tank is cooled from 90 ℃ to 70 ℃ in the gas-liquid separator and then flows back to the electrolytic tank. The valves V1 and V4 are opened to ensure the countercurrent heat exchange of the alkali liquor and the cooling liquid, so that the electrolysis waste heat is recovered to the maximum extent, and the quality loss of heat energy is reduced.
Fig. 5 shows a schematic diagram of the electrical hydrogen production waste heat utilization device in an exothermic state according to an exemplary embodiment of the present disclosure, and disconnected or bypassed pipes and equipment are not shown for clarity of illustration.
In the heat release stage, the hot liquid at the upper part of the heat storage tank is reduced from 80 ℃ to 60 ℃ in the heat exchanger, flows back to the lower part of the heat storage tank through valves V2, V6 and V7 and is circulated by a circulating pump PBProvide hydrothermal circulation power and control the flow of hydrothermal fluid. The alkali liquor at the outlet of the electrolytic tank is heated from 50 ℃ to 70 ℃ in the gas-liquid separator and then flows back to the electrolytic tank. The valves V2 and V3 are opened to ensure the countercurrent heat exchange between the alkali liquor and the cooling water.
Fig. 6 shows the on-off states of each valve, the circulating pump and the water cooler under the three conditions of the heat storage state, the heat release state and the refrigeration of the external cold source.
Fig. 7 shows a flowchart of a waste heat utilization method according to an exemplary embodiment of the present disclosure. As shown in fig. 7, in step 702, it is determined whether or not the normal pressure type heat storage tank as the heat storage device reaches the first heat storage condition. In one example, an average temperature measured by a plurality of sensors near the top of the thermal storage tank may be obtained, and if the average temperature is greater than a first preset value, it is determined that the thermal storage tank reaches a first thermal storage condition. In one example, the first preset value may be set to 50 ℃.
If the heat storage tank reaches the first heat storage condition, step 704 is entered to further determine whether the heat storage tank reaches the second heat storage condition. The second heat storage condition may be higher in heat storage requirement than the first heat storage condition, and for example, a state where the heat storage tank is fully stored may be set as the second heat storage condition. In one example, whether the heat storage is full may be judged by whether an average temperature measured by a plurality of sensors vertically and uniformly distributed in the heat storage tank reaches a second preset value, which may be set to 80 ℃.
And if the judgment result in the step 704 is negative, the step 706 is carried out, and whether the front temperature of the cell of the electrical hydrogen production system is lower than the preset front temperature of the cell is continuously judged. The temperature before the tank refers to the temperature of the alkali liquor before entering the electrolytic tank, namely the temperature of the alkali liquor flowing out of the gas-liquid separator. In one example, the pre-bath pre-temperature may be set at 60 ℃.
If the temperature before the cell is lower than the preset temperature before the cell in step 706, step 708 is performed, and the electric hydrogen production waste heat utilization device is set to be in the heat storage state; if the temperature before the cell is higher than the preset temperature before the cell in step 706, the process proceeds to step 710, and the electric hydrogen production waste heat utilization device is set to enter the heat release state.
Returning to step 704, if the heat storage equipment reaches the second heat storage condition, then entering step 712, and further determining whether the pre-tank temperature of the electrical hydrogen production system is lower than a preset pre-tank temperature. If yes, the step 710 is carried out, and the electric hydrogen production waste heat utilization device is set to be in the heat release state; if not, the process enters 714, the first valve, the second valve, the third valve, the fourth valve, the heat storage equipment, the heat exchanger and the external cold source are closed, and the external cold source is communicated with the heat exchanger to provide cooling for the electrical hydrogen production system.
If the heat storage tank does not reach the first heat storage condition, that is, if the judgment result in step 702 is negative, step 716 is performed, and it is continuously judged whether the pre-tank temperature of the electrical hydrogen production system is lower than a preset pre-tank temperature. If the pre-tank temperature is lower than the pre-set pre-tank temperature, step 718 is performed, the first to fourth valves are closed, i.e., the heat storage devices are bypassed, and step 720 is performed, wherein an external heat source is used to provide heat for the heat storage devices.
If the judgment result in the step 716 is not, the step 708 is executed, the electric hydrogen production waste heat utilization device is set to be in the heat storage state, and meanwhile, the step 720 is executed, an external heat source is used for providing heat for the heat storage device.
By adopting the waste heat utilization method of the electric hydrogen production waste heat utilization device, the cold and heat source switching control strategy is realized, and the electrolysis temperature control in the full operation interval of the electric hydrogen production system is realized.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (12)

1. The utility model provides an electricity hydrogen manufacturing waste heat utilization equipment for electricity hydrogen manufacturing system, its characterized in that, the device includes the heat-retaining equipment, the heat-retaining equipment includes heat-retaining main part, first cold liquid mouth and first hot liquid mouth:
the heat storage body is used for storing liquid;
the first cold liquid port is connected to a liquid inlet of a heat exchanger in a gas-liquid separator of the electrical hydrogen production system through a first pipeline, the first cold liquid port is also connected to a liquid outlet of the heat exchanger through a second pipeline, and the first cold liquid port is communicated with liquid at a first temperature in the heat storage main body;
the first hot liquid port is connected to the liquid inlet of the heat exchanger through a third pipeline, the first hot liquid port is connected to the liquid outlet of the heat exchanger through a fourth pipeline, the first hot liquid port is communicated with liquid at a second temperature in the heat storage main body, and the second temperature is higher than the first temperature;
the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are correspondingly provided with a first valve, a second valve, a third valve and a fourth valve so as to control the corresponding pipelines to be switched on or switched off.
2. The apparatus of claim 1, further comprising a first circulation pump disposed on one of the first and fourth lines and a second circulation pump disposed on one of the second and third lines.
3. The apparatus of claim 1, further comprising a valve assembly connected in series between two nodes of a common line segment, the common line segment being a common portion of two of the first, second, third and fourth lines having a common interface, the valve assembly comprising a circulation pump and fifth, sixth, seventh and eighth valves, wherein:
the first end of the fifth valve and the first end of the sixth valve are connected to a liquid inlet of the circulating pump, and the first end of the seventh valve and the first end of the eighth valve are connected to a liquid outlet of the circulating pump;
a second end of the fifth valve and a second end of the seventh valve are connected to one of the two nodes, and a second end of the sixth valve and a second end of the eighth valve are connected to the other of the two nodes.
4. The apparatus of claim 1, wherein the heat storage device is a constant pressure heat storage tank.
5. The apparatus of claim 1, further comprising an external heating source, the thermal storage device further comprising a second cold fluid port and a second hot fluid port, wherein:
the liquid inlet of the external heating source is connected with the second cold liquid port of the heat storage equipment, and the liquid outlet of the external heating source is connected with the second hot liquid port of the heat storage equipment to provide heat for the heat storage equipment.
6. The apparatus of claim 1, further comprising an external cooling source, wherein a liquid outlet of the external cooling source is connected to the liquid inlet of the heat exchanger through a fifth pipeline, and the liquid outlet of the heat exchanger is connected to the liquid inlet of the external cooling source through a sixth pipeline.
7. The apparatus of claim 6, wherein the fifth pipeline is provided with a regulating valve to regulate the flow of liquid from the external heat sink to the heat exchanger.
8. A method for utilizing waste heat using the device according to any one of claims 1-7, wherein the method comprises:
opening the first valve and the fourth valve, and closing the second valve and the third valve, so that the liquid flowing out of the first cold liquid port of the heat storage equipment flows into the liquid inlet of the heat exchanger through the first pipeline, then flows out of the liquid outlet of the heat exchanger, and flows into the first hot liquid port of the heat storage equipment through the fourth pipeline, so as to set the electric hydrogen production waste heat utilization device in the heat storage state;
and closing the first valve and the fourth valve, and opening the second valve and the third valve, so that the liquid flowing out of the first hot liquid port of the heat storage equipment flows into the liquid inlet of the heat exchanger through the third pipeline, then flows out of the liquid outlet of the heat exchanger, and flows into the first cold liquid port of the heat storage equipment through the second pipeline, thereby setting the electric hydrogen production waste heat utilization device to be in the heat release state.
9. The method of claim 8, further comprising:
when the heat storage device reaches the first heat storage condition but does not reach the second heat storage condition,
if the pre-bath temperature of the electrical hydrogen production system is lower than the preset pre-bath temperature, setting the electrical hydrogen production waste heat utilization device to be in the heat release state;
if the temperature in front of the electric hydrogen production system is higher than the preset temperature in front of the tank, setting the electric hydrogen production waste heat utilization device in the heat storage state;
wherein the second heat storage condition has a higher heat storage requirement than the first heat storage condition.
10. The method of claim 9, further comprising:
when the heat storage device reaches the second heat storage condition,
if the pre-bath temperature of the electrical hydrogen production system is lower than the preset pre-bath temperature, setting the electrical hydrogen production waste heat utilization device to be in the heat release state;
if the temperature before the groove of the electrical hydrogen production system is higher than the preset temperature before the groove, the first valve, the second valve, the third valve and the fourth valve are closed, the heat exchanger is communicated with an external cold source, and the electrical hydrogen production system is cooled by the external cold source.
11. The method of claim 9, further comprising:
and when the heat storage equipment does not reach the first heat storage condition, the heat storage equipment is communicated with an external heating source, and heat is provided for the heat storage equipment through the external heating source.
12. The method of claim 9, further comprising:
when the heat storage device does not reach the first heat storage condition,
if the temperature before the tank is higher than the preset temperature before the tank, setting the electric hydrogen production waste heat utilization device in the heat storage state;
and if the tank front temperature is lower than the preset tank front temperature, closing the first valve, the second valve, the third valve and the fourth valve.
CN202111579958.7A 2021-12-22 2021-12-22 Electric hydrogen production waste heat utilization device and method Pending CN114087904A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114807959A (en) * 2022-03-15 2022-07-29 中国船舶重工集团公司第七一八研究所 High-efficiency hydrogen production system suitable for wide power fluctuation
CN114967782A (en) * 2022-06-28 2022-08-30 中国船舶重工集团公司第七一八研究所 Method and system for controlling running temperature of electrolytic cell based on heat balance
EP4245887A1 (en) * 2022-03-16 2023-09-20 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Apparatus for separating a product gas from an electrolysis medium

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114807959A (en) * 2022-03-15 2022-07-29 中国船舶重工集团公司第七一八研究所 High-efficiency hydrogen production system suitable for wide power fluctuation
CN114807959B (en) * 2022-03-15 2023-10-27 中国船舶重工集团公司第七一八研究所 High-efficiency hydrogen production system suitable for wide power fluctuation
EP4245887A1 (en) * 2022-03-16 2023-09-20 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Apparatus for separating a product gas from an electrolysis medium
CN114967782A (en) * 2022-06-28 2022-08-30 中国船舶重工集团公司第七一八研究所 Method and system for controlling running temperature of electrolytic cell based on heat balance
CN114967782B (en) * 2022-06-28 2024-02-09 中国船舶重工集团公司第七一八研究所 Method and system for controlling running temperature of electrolytic tank based on heat balance

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