An integrated system and method of operation for electrohydrolysis

Abstract

The present disclosure relates to an integrated system and operation method of electrohydrogenation, which is beneficial to deep coupling of internal streams, significantly improves system coordination operation capability and dynamic response speed, and is beneficial to recovery of system waste heat and realization of energy distribution, and significantly improves system energy utilization rate.

Description

Technical Field

[0001] This disclosure relates to the field of electro-hydrogenation technology, and more specifically, to an integrated electro-hydrogenation system and its operation method. Background Technology

[0002] Green electricity-to-hydrogen synthesis chemical systems use hydrogen as a link, serving as a crucial means of decarbonizing the chemical industry. However, due to issues such as low energy efficiency in electrolytic hydrogen production, long hydrogen transportation distances, and lengthy green hydrogen conversion processes, the economics of electricity-hydrogen-chemical systems are poor, hindering large-scale production and application. Therefore, establishing an integrated system that combines hydrogen production stations and chemical synthesis stations, reducing hydrogen transportation stages, can effectively minimize energy loss. However, current integrated systems still face the problem of low overall energy efficiency. Summary of the Invention

[0003] The purpose of this disclosure is to provide an integrated electro-hydrogenation system and operating method, which facilitates deep coupling of internal logistics, recovery of system waste heat and energy distribution, and significantly improves system energy utilization.

[0004] To achieve the above objectives, the first aspect of this disclosure provides an integrated electro-hydrogenation system, the system comprising a power generation module, a hydrogen production module, a feed gas compression module, a synthetic chemical module, and an energy recovery management module. The power generation module is electrically connected to the hydrogen production module. The hydrogen outlet of the hydrogen production module is connected to the feed gas inlet of the feed gas compression module via a hydrogen pipeline. The compressed feed gas outlet of the feed gas compression module is connected to the compressed feed gas inlet of the synthetic chemical module via a feed gas pipeline. The steam outlet of the synthetic chemical module is connected to the steam inlet of the hydrogen production module via a steam pipeline. The energy recovery management module is connected to the hydrogen production module, the raw material gas compression module, and the synthetic chemical module through energy flow pipelines, respectively, and is used to recover and utilize the waste heat in the hydrogen production module, the raw material gas compression module, and the synthetic chemical module. The energy flow pipeline includes a hot flow pipeline, a cold flow pipeline, and an electrical circuit. The hot flow pipeline contains a working medium carrying thermal energy, and the cold flow pipeline contains a working medium carrying cold energy.

[0005] Optionally, the heat outlet of the hydrogen production module is connected to the heat inlet of the feed gas compression module via a heat flow pipeline, the heat outlet of the feed gas compression module is connected to the heat inlet of the synthetic chemical module via a heat flow pipeline, and the heat outlet of the synthetic chemical module is connected to the heat inlet of the hydrogen production module via a heat flow pipeline.

[0006] Optionally, the system further includes a power transmission module and a hydrogen storage module, wherein the hydrogen storage module is disposed between the hydrogen production module and the feed gas compression module; The power transmission module is electrically connected to the power generation module and the hydrogen production module via circuits respectively; preferably, the power transmission module is also electrically connected to the raw material gas compression module via circuits. The hydrogen inlet of the hydrogen storage module is connected to the hydrogen outlet of the hydrogen production module via a hydrogen pipeline, and the hydrogen outlet of the hydrogen storage module is connected to the feed gas inlet of the feed gas compression module via a hydrogen pipeline; the hydrogen storage module is connected to the energy recovery management module via hot flow pipelines and cold flow pipelines respectively.

[0007] Optionally, the energy recovery management module further includes a thermoelectric conversion device, a heat storage device, an electrothermal conversion device, and an auxiliary cold source, wherein the heat storage device is a hot water storage tank; The heat inlet of the thermoelectric conversion device is connected to the heat outlet of the hydrogen production module, the heat outlet of the feed gas compression module, the heat outlet of the synthetic chemical module, and the heat outlet of the hydrogen storage module via heat pipes. The cold outlet of the thermoelectric conversion device is connected to the cold inlet of the hydrogen production module, the cold inlet of the feed gas compression module, the cold inlet of the synthetic chemical module, and the cold inlet of the hydrogen storage module via cold pipes. The thermoelectric conversion device is electrically connected to the hydrogen production module, the feed gas compression module, the electrothermal conversion device, and the auxiliary cold source via circuits. The heat outlet of the electrothermal conversion device is connected to the heat inlet of the thermal storage device and the heat inlet of the hydrogen production module through a heat pipe. The heat outlet of the thermal storage device is connected to the heat inlet of the thermoelectric conversion device and the heat inlet of the hydrogen production module through heat pipes. The cold flow outlet of the auxiliary cold source is connected to the cold flow inlet of the hydrogen production module, the cold flow inlet of the feed gas compression module, the cold flow inlet of the synthetic chemical module, and the cold flow inlet of the hydrogen storage module via cold flow pipelines.

[0008] Optionally, the hydrogen production module includes a fuel cell stack array, an anode separator, a first heat exchanger, a cathode separator, a second heat exchanger, a separator, and a third heat exchanger. The anode outlet of the fuel cell stack array is connected to the inlet of the first heat exchanger via the anode separator. The cathode outlet of the fuel cell stack array is connected to the inlet of the third heat exchanger via the cathode separator, the second heat exchanger, and the separator in sequence. The hydrogen outlet of the third heat exchanger is connected to the feed gas inlet of the feed gas compression module. The raw material gas compression module includes a mixing device, a buffer device, a first compressor, and a storage tank. The raw material gas inlet of the mixing device is connected to the hydrogen outlet of the hydrogen production module. The mixed gas outlet of the mixing device is connected to the gas inlet of the first compressor through the buffer device. The compressed raw material gas outlet of the first compressor is connected to the inlet of the storage tank and the compressed raw material gas inlet of the synthetic chemical module, respectively. Preferably, the outlet of the storage tank is also connected to the compressed raw material gas inlet of the synthetic chemical module. The chemical synthesis module includes a heater, a synthesis device, a heat recovery unit, a cooler, and a second compressor. The compressed raw material gas inlet of the heater is connected to the compressed raw material gas outlet of the first compressor. The outlet of the heater is connected to the gas inlet of the synthesis device. The product gas outlet of the synthesis device is connected to both the gas inlet of the synthesis device and the inlet of the heat recovery unit. The outlet of the heat recovery unit is connected to the inlet of the second compressor via the cooler. The outlet of the second compressor is used to collect chemical products.

[0009] The second aspect of this disclosure provides a method for operating the system described in the first aspect of this disclosure, the method comprising: transmitting electrical energy output from a power generation module to a hydrogen production module; transmitting hydrogen produced by the hydrogen production module to a feedstock gas compression module for compression to obtain compressed feedstock gas; and allowing the compressed feedstock gas to enter a chemical synthesis module for chemical synthesis, and returning the resulting high-temperature saturated steam to the hydrogen production module for continued use. The thermal energy from the hydrogen production module, the feed gas compression module, and the synthetic chemical module is transferred to the energy recovery management module via a working medium for energy conversion and / or energy storage. At least one of the thermal energy, cold energy, and electrical energy generated by the energy recovery management module is then transferred to at least one of the hydrogen production module, the feed gas compression module, and the synthetic chemical module for reuse.

[0010] Optionally, the energy recovery management module includes a thermoelectric conversion device, a thermal storage device, an electrothermal conversion device, and an auxiliary cold source; The method includes: The thermal energy from the hydrogen production module, the feed gas compression module, and the chemical synthesis module can be used for at least one of the following: - The working medium is delivered to the thermoelectric conversion device of the energy recovery management module and converted into electrical energy, thus obtaining a working medium carrying cold energy; - The energy is transported to the thermal storage device of the energy recovery management module via the working medium for storage; The electrical energy from the thermoelectric conversion device is used for at least one of the following: -Power is supplied to the hydrogen production module to produce hydrogen through water electrolysis. - The gas is supplied to the raw material gas compression module to power the first compressor. - It is fed into an electrothermal conversion device and converted into heat energy, and - It is delivered to the auxiliary cold source to provide power for electrical cooling and to obtain a working medium carrying cold energy; The working medium carrying cold energy is respectively delivered to the hydrogen production module, the raw material gas compression module, the synthetic chemical module, and the hydrogen storage module for cooling; The electrical energy supplied to the electrothermal conversion device is converted into heat energy, and the converted heat energy is used for at least one of the following: - The heat is transported to the heat storage device via a working medium for heat storage. -Heating is supplied to the hydrogen production module via the working medium; To use the thermal energy stored in the thermal storage device for at least one of the following: -The heat energy is supplied to the thermoelectric conversion device through the working medium. -Heating is supplied to the hydrogen production module via the working medium.

[0011] Optionally, the operating method further includes dividing the heat sources in the system into primary heat sources, secondary heat sources and tertiary heat sources. The heat sources in the system include one or more of the hydrogen production module outlet stream, the raw material gas compression module outlet gas and the synthetic chemical product module outlet stream, and the temperatures of the primary heat sources, secondary heat sources and tertiary heat sources decrease sequentially. The working medium carrying cold energy from the thermoelectric conversion device first exchanges heat with a tertiary heat source to transfer the tertiary heat stored in the tertiary heat source to the working medium, forming a tertiary thermal working medium; the tertiary thermal working medium then exchanges heat with a secondary heat source to transfer the secondary heat stored in the secondary heat source to the tertiary thermal working medium, forming a secondary thermal working medium; the secondary thermal working medium then exchanges heat with a primary heat source to transfer the primary heat stored in the primary heat source to the secondary thermal working medium, forming a primary thermal working medium; finally, the primary thermal working medium is returned to the thermoelectric conversion device. Preferably, the temperature of the working medium carrying cold energy is 7~15℃, the temperature of the primary heat source is 200~800℃, the temperature of the secondary heat source is 95~200℃, and the temperature of the tertiary heat source is 20~95℃. More preferably, when the electrolysis temperature of the hydrogen production module is 700~800℃, the hydrogen gas at the outlet of the hydrogen production module is a primary heat source, the chemical product at the outlet of the synthetic chemical product module is a secondary heat source, and the mixed gas at the outlet of the raw material gas compression module is a tertiary heat source. When the electrolysis temperature of the hydrogen production module is 70~95℃, the chemical product outlet of the synthetic chemical product module is the primary heat source, the mixed gas outlet of the raw material gas compression module is the secondary heat source, and the hydrogen outlet of the hydrogen production module is the tertiary heat source.

[0012] Optionally, when the absolute value of the temperature difference between the tertiary heat source and the secondary heat source is less than 30°C, and the absolute value of the temperature difference between the secondary heat source and the primary heat source is greater than 30°C, a working medium carrying cold energy from the thermoelectric conversion device exchanges heat with the tertiary heat source, and the resulting tertiary working medium returns to the thermoelectric conversion device; another working medium carrying cold energy from the thermoelectric conversion device does not exchange heat with the tertiary heat source, but directly exchanges heat with the secondary heat source, and the resulting secondary working medium exchanges heat with the primary heat source, and the resulting primary working medium returns to the thermoelectric conversion device. When the absolute value of the temperature difference between the tertiary heat source and the secondary heat source is greater than 30°C, and the absolute value of the temperature difference between the secondary heat source and the primary heat source is less than 30°C, a working medium carrying cold energy from the thermoelectric conversion device exchanges heat with the tertiary heat source, and the resulting tertiary working medium exchanges heat with the secondary heat source, and the resulting secondary working medium returns to the thermoelectric conversion device; and / or, the resulting secondary working medium is transported to a medium-high temperature storage tank for heat storage, and the heat energy stored in the medium-high temperature storage tank is transported to the synthetic chemical module for heating; another working medium carrying cold energy from the thermoelectric conversion device does not exchange heat with the tertiary heat source and the secondary heat source, but directly exchanges heat with the primary heat source, and the resulting primary working medium returns to the thermoelectric conversion device.

[0013] Optionally, the operating method further includes: first transmitting the electrical energy from the power generation module to the power transmission module, and then transmitting the electrical energy from the power transmission module to the hydrogen production module and the feed gas compression module respectively to supply power; and / or, A portion of the hydrogen produced by the hydrogen production module is transported to the hydrogen storage module for storage, and another portion is transported to the feed gas compression module for compression; the thermal energy of the hydrogen storage module is transported to the thermoelectric conversion device of the energy recovery management module through the working medium, and the working medium carrying cold energy of the energy recovery management module is transported to the hydrogen storage module for cooling; Optionally, the hydrogen in the hydrogen storage module can be supplemented by entering the feed gas compression module when the hydrogen production module's supply is insufficient.

[0014] Optionally, the power generation module uses renewable energy to generate electricity, preferably including one or more of wind power, solar power, hydropower, biomass power and ocean energy power; The hydrogen production methods of the hydrogen production module include alkaline hydrogen production, proton exchange membrane hydrogen production, and solid oxide hydrogen production. Part of the compressed raw material gas in the raw material gas compression module enters the chemical synthesis module for chemical synthesis, and the other part enters the storage tank for storage. In the synthetic chemical module, part of the product gas is returned to the synthesis unit for further reaction, and the other part enters the heat recovery unit to recover the heat energy of the product gas.

[0015] Through the above technical solutions, this disclosure provides an integrated electro-hydrogenation system and its operation method. The system includes at least a power generation module, a hydrogen production module, a feedstock gas compression module, a chemical synthesis module, and an energy recovery management module. Material coupling exists between the hydrogen production module, the feedstock gas compression module, and the chemical synthesis module, which facilitates deep integration of internal logistics, significantly improving the system's coordinated operation capability and dynamic response speed. Energy coupling also exists between the hydrogen production module, the feedstock gas compression module, the chemical synthesis module, and the energy recovery management module, which facilitates the recovery of waste heat and energy distribution, significantly improving the system's energy utilization rate. The method of this disclosure reduces energy loss and improves energy utilization efficiency through energy flow coordination and material flow coordination, respectively, and enhances the coordinated operation capability of the electro-hydrogenation and chemical synthesis system involving renewable energy.

[0016] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of an integrated electro-hydrogenation system according to one embodiment of the present disclosure; Figure 2 This is a schematic diagram of an energy recovery management module in one embodiment of this disclosure; Figure 3 This is a schematic diagram of a hydrogen production module in one embodiment of the present disclosure; Figure 4 This is a schematic diagram of a raw material gas compression module in one embodiment of the present disclosure; Figure 5 This is a schematic diagram of a chemical synthesis module in one embodiment of the present disclosure. Detailed Implementation

[0018] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0019] The first aspect of this disclosure provides an integrated electro-hydrogenation system, the system comprising a power generation module, a hydrogen production module, a feed gas compression module, a synthetic chemical module, and an energy recovery management module. The power generation module is electrically connected to the hydrogen production module. The hydrogen outlet of the hydrogen production module is connected to the feed gas inlet of the feed gas compression module via a hydrogen pipeline. The compressed feed gas outlet of the feed gas compression module is connected to the compressed feed gas inlet of the synthetic chemical module via a feed gas pipeline. The steam outlet of the synthetic chemical module is connected to the steam inlet of the hydrogen production module via a steam pipeline. The energy recovery management module is connected to the hydrogen production module, the raw material gas compression module, and the synthetic chemical module through energy flow pipelines, respectively, and is used to recover and utilize the waste heat in the hydrogen production module, the raw material gas compression module, and the synthetic chemical module. The energy flow pipeline includes a hot flow pipeline, a cold flow pipeline, and an electrical circuit. The hot flow pipeline contains a working medium carrying thermal energy, and the cold flow pipeline contains a working medium carrying cold energy.

[0020] The system disclosed herein includes at least a power generation module, a hydrogen production module, a feedstock gas compression module, a chemical synthesis module, and an energy recovery management module. Material coupling exists between the hydrogen production module, the feedstock gas compression module, and the chemical synthesis module, which facilitates deep integration of internal logistics, significantly improving the system's coordinated operation capability and dynamic response speed. Specifically, the hydrogen produced by the hydrogen production module is used as a feedstock for the chemical synthesis module, and the high-temperature saturated steam generated by the chemical synthesis module provides electrolysis feedstock and heat for the hydrogen production module. Furthermore, energy coupling exists between the hydrogen production module, the feedstock gas compression module, the chemical synthesis module, and the energy recovery management module, which facilitates the recovery of system waste heat and energy distribution, significantly improving the system's energy utilization rate. Specifically, the energy recovery management module can receive thermal energy from the hydrogen production module, the feedstock gas compression module, and the chemical synthesis module, realizing the conversion of internal cold energy, thermal energy, and electrical energy, and transmitting cold energy, thermal energy, and electrical energy externally.

[0021] In one embodiment of this disclosure, the hot flow outlet of the hydrogen production module is connected to the hot flow inlet of the feed gas compression module via a hot flow pipeline. The hot flow outlet of the feed gas compression module is connected to the hot flow inlet of the synthetic chemical module via a hot flow pipeline. The hot flow outlet of the synthetic chemical module is connected to the hot flow inlet of the hydrogen production module via a hot flow pipeline. The hydrogen production module, feed gas compression module, and synthetic chemical module of this disclosure can transfer heat energy through a working medium carrying heat energy in the hot flow pipeline.

[0022] In one embodiment of this disclosure, the system further includes a power transmission module and a hydrogen storage module, the hydrogen storage module being disposed between the hydrogen production module and the feed gas compression module; the power transmission module is electrically connected to the power generation module and the hydrogen production module respectively via circuits; preferably, the power transmission module is also electrically connected to the feed gas compression module via circuits. The hydrogen inlet of the hydrogen storage module is connected to the hydrogen outlet of the hydrogen production module via a hydrogen pipeline, and the hydrogen outlet of the hydrogen storage module is connected to the feed gas inlet of the feed gas compression module via a hydrogen pipeline; the hydrogen storage module is connected to the energy recovery management module via hot flow pipelines and cold flow pipelines respectively.

[0023] In one embodiment of this disclosure, the energy recovery management module further includes a thermoelectric conversion device, a heat storage device, an electrothermal conversion device, and an auxiliary cold source, wherein the heat storage device is a hot water storage tank; The heat inlet of the thermoelectric conversion device is connected to the heat outlet of the hydrogen production module, the heat outlet of the feed gas compression module, the heat outlet of the synthetic chemical module, and the heat outlet of the hydrogen storage module via heat pipes. The cold outlet of the thermoelectric conversion device is connected to the cold inlet of the hydrogen production module, the cold inlet of the feed gas compression module, the cold inlet of the synthetic chemical module, and the cold inlet of the hydrogen storage module via cold pipes. The thermoelectric conversion device is electrically connected to the hydrogen production module, the feed gas compression module, the electrothermal conversion device, and the auxiliary cold source via circuits. The heat outlet of the electrothermal conversion device is connected to the heat inlet of the thermal storage device and the heat inlet of the hydrogen production module through a heat pipe. The heat outlet of the thermal storage device is connected to the heat inlet of the thermoelectric conversion device and the heat inlet of the hydrogen production module through heat pipes. The cold flow outlet of the auxiliary cold source is connected to the cold flow inlet of the hydrogen production module, the cold flow inlet of the feed gas compression module, the cold flow inlet of the synthetic chemical module, and the cold flow inlet of the hydrogen storage module via cold flow pipelines.

[0024] The schematic diagram of the energy recovery management module disclosed herein is as follows: Figure 2 As shown, the thermoelectric conversion device is connected to the external module through hot flow pipes, cold flow pipes and circuits to recover external heat energy and convert the heat energy into electrical energy to power the internal device or the external module; the electrothermal conversion device and the heat storage device are connected to the internal device or the external module through hot flow pipes to supply heat to the internal or external; the auxiliary cold source is connected to the external module through cold flow pipes to supply cooling to the external.

[0025] In one embodiment of this disclosure, the hydrogen production module includes a fuel cell array, an anode separator, a first heat exchanger, a cathode separator, a second heat exchanger, a separator, and a third heat exchanger. The anode outlet of the fuel cell array is connected to the inlet of the first heat exchanger via the anode separator. The cathode outlet of the fuel cell array is connected to the inlet of the third heat exchanger via the cathode separator, the second heat exchanger, and the separator in sequence. The hydrogen outlet of the third heat exchanger is connected to the feed gas inlet of the feed gas compression module. A schematic diagram of the hydrogen production module is shown below. Figure 3 As shown.

[0026] The raw material gas compression module includes a mixing device, a buffer device, a first compressor, and a storage tank. The raw material gas inlet of the mixing device is connected to the hydrogen outlet of the hydrogen production module. The mixed gas outlet of the mixing device is connected to the gas inlet of the first compressor through the buffer device. The compressed raw material gas outlet of the first compressor is connected to both the inlet of the storage tank and the compressed raw material gas inlet of the synthetic chemical module. Preferably, the outlet of the storage tank is also connected to the compressed raw material gas inlet of the synthetic chemical module. A schematic diagram of the raw material gas compression module is shown below. Figure 4 As shown.

[0027] In the raw material gas compression module of this disclosure, multiple raw material gases are first mixed in a mixing device, and then enter the first compressor through a buffer device and compressed to the reaction pressure. Part of the compressed raw material gas can be stored in a storage tank, and part of it can be reacted in the synthetic chemical module. The mixed gas in the storage tank can be introduced into the synthetic chemical module.

[0028] The synthetic chemical module includes a heater, a synthesis unit, a heat recovery unit, a cooler, and a second compressor. The compressed feed gas inlet of the heater is connected to the compressed feed gas outlet of the first compressor, and the outlet of the heater is connected to the gas inlet of the synthesis unit. The product gas outlet of the synthesis unit is connected to both the gas inlet of the synthesis unit and the inlet of the heat recovery unit. The outlet of the heat recovery unit is connected to the inlet of the second compressor via the cooler. The outlet of the second compressor is used to collect the chemical products. A schematic diagram of the synthetic chemical module is shown below. Figure 5 As shown.

[0029] In the synthetic chemical product module of this disclosure, the compressed raw material gas first enters the heater and is heated to the reaction temperature, and then enters the synthesis device to carry out the chemical reaction. Part of the product gas can be returned to the synthesis device for further reaction to improve the conversion rate of reactants, and the other part enters the heat recovery unit to recover the heat energy of the product gas. After cooling and compression, it is transported, stored or directly consumed.

[0030] The second aspect of this disclosure provides a method for operating the system described in the first aspect of this disclosure, the method comprising: transmitting electrical energy output from a power generation module to a hydrogen production module; transmitting hydrogen produced by the hydrogen production module to a feedstock gas compression module for compression to obtain compressed feedstock gas; transmitting the compressed feedstock gas into a chemical synthesis module for chemical synthesis; and returning saturated vapor generated by the chemical synthesis module to the hydrogen production module for continued use. The thermal energy from the hydrogen production module, the feed gas compression module, and the synthetic chemical module is transferred to the energy recovery management module via a working medium for energy conversion and / or energy storage. At least one of the thermal energy, cold energy, and electrical energy generated by the energy recovery management module is then transferred to at least one of the hydrogen production module, the feed gas compression module, and the synthetic chemical module for reuse.

[0031] The methods disclosed herein reduce energy loss and improve energy utilization efficiency through energy flow coordination and material flow coordination, respectively, and increase the coordinated operation capability of the electro-hydrogen synthesis chemical system involving renewable energy.

[0032] In one embodiment of this disclosure, the energy recovery management module includes a thermoelectric conversion device, a thermal storage device, an electrothermal conversion device, and an auxiliary cold source; The method includes: The thermal energy from the hydrogen production module, the feed gas compression module, and the chemical synthesis module can be used for at least one of the following: - The working medium is delivered to the thermoelectric conversion device of the energy recovery management module and converted into electrical energy, thus obtaining a working medium carrying cold energy; - The energy is transported to the thermal storage device of the energy recovery management module via the working medium for storage; The electrical energy from the thermoelectric conversion device is used for at least one of the following: -Power is supplied to the hydrogen production module to produce hydrogen through water electrolysis. - The gas is supplied to the raw material gas compression module to power the first compressor. - The energy is delivered to the electrothermal conversion device and converted into heat energy. - It is delivered to the auxiliary cold source to provide power for electrical cooling and to obtain a working medium carrying cold energy; The working medium carrying cold energy is respectively delivered to the hydrogen production module, the raw material gas compression module, the synthetic chemical module, and the hydrogen storage module for cooling; The electrical energy supplied to the electrothermal conversion device is converted into heat energy, and the converted heat energy is used for at least one of the following: - The heat is transported to the heat storage device via a working medium for heat storage. -Heating is supplied to the hydrogen production module via the working medium; To use the thermal energy stored in the thermal storage device for at least one of the following: -The heat energy is supplied to the thermoelectric conversion device through the working medium. -Heating is supplied to the hydrogen production module via the working medium.

[0033] The thermoelectric conversion device disclosed herein can convert the thermal energy carried by the working medium into electrical energy through a thermo-electric conversion process, and deliver the electrical energy to the internal system for cooling and heating or to the external system for water electrolysis hydrogen production and compressor use. The electrothermal conversion device can convert electrical energy into thermal energy through an electro-thermal conversion process, and transfer the converted thermal energy to a heat storage device for storage or for external heating, such as heating the hydrogen production module to maintain the temperature of its inlet stream at a set temperature. The heat storage device can store the thermal energy converted by the electrothermal conversion device and can transfer the stored thermal energy to the thermoelectric conversion device through the working medium to replenish the thermal energy. Simultaneously, when the hydrogen production module is operating at low load, the stored thermal energy can be directly applied to the hydrogen production process. The auxiliary cold source can receive electrical energy from the thermoelectric conversion device and generate a working medium carrying the cold source. This working medium carrying the cold source can provide cooling for the hydrogen purification process in the hydrogen production module, and can also exchange heat with the working media carrying the heat source in the feed gas compression module, the synthetic chemical module, and the hydrogen storage module. Heating refers to the use of a working medium carrying heat energy as a heat exchanger to raise the temperature of other materials; cooling refers to the use of a working medium carrying cold energy as a cold exchanger to lower the temperature of other materials.

[0034] In one embodiment of this disclosure, the operating method further includes dividing the heat sources in the system into a primary heat source, a secondary heat source, and a tertiary heat source. The heat sources in the system include one or more of the outlet stream of the hydrogen production module, the outlet gas of the raw material gas compression module, and the outlet stream of the synthetic chemical module. The temperatures of the primary heat source, the secondary heat source, and the tertiary heat source decrease sequentially. The working medium carrying cold energy from the thermoelectric conversion device first exchanges heat with a tertiary heat source to transfer the tertiary heat stored in the tertiary heat source to the working medium, forming a tertiary thermal working medium; the tertiary thermal working medium then exchanges heat with a secondary heat source to transfer the secondary heat stored in the secondary heat source to the tertiary thermal working medium, forming a secondary thermal working medium; the secondary thermal working medium then exchanges heat with a primary heat source to transfer the primary heat stored in the primary heat source to the secondary thermal working medium, forming a primary thermal working medium; finally, the primary thermal working medium is returned to the thermoelectric conversion device.

[0035] The operating method disclosed herein divides the heat sources in the system into primary, secondary, and tertiary heat sources according to their temperatures. The working medium carrying cold energy from the thermoelectric conversion device passes sequentially through the tertiary heat source with the lowest temperature, the secondary heat source with the middle temperature, and the primary heat source with the highest temperature. This allows for the tiered recovery of waste heat from the system, reducing the heat exchange temperature difference, minimizing energy loss, and significantly improving the system's energy utilization rate.

[0036] In a preferred embodiment, the temperature of the working medium carrying cold energy is 7~15℃, the temperature of the primary heat source is 200~800℃, the temperature of the secondary heat source is 95~200℃, and the temperature of the tertiary heat source is 20~95℃.

[0037] In one embodiment, the hydrogen production module employs high-temperature electrolysis technology, where the outlet material temperature of the hydrogen production module is the highest. In a preferred embodiment, when the electrolysis temperature of the hydrogen production module is 700-800°C, the outlet hydrogen of the hydrogen production module serves as a primary heat source, the outlet chemicals of the synthetic chemical module serve as a secondary heat source, and the outlet mixed gas of the feed gas compression module serve as a tertiary heat source. In the above embodiment, the working medium carrying cold energy from the thermoelectric conversion device is first transported to the feed gas compression module for heat exchange, then to the synthetic chemical module for heat exchange, and finally to the hydrogen production module for heat exchange.

[0038] In another embodiment, the hydrogen production module employs low-temperature electrolysis technology, in which case the outlet material temperature of the hydrogen production module is the lowest. In a preferred embodiment, when the electrolysis temperature of the hydrogen production module is 70~95℃, the outlet chemical product of the synthetic chemical product module serves as a primary heat source, the outlet mixed gas of the feed gas compression module serves as a secondary heat source, and the outlet hydrogen of the hydrogen production module serves as a tertiary heat source. In the above embodiments, the working medium carrying cold energy from the thermoelectric conversion device is first transported to the hydrogen production module for heat exchange, then to the feed gas compression module for heat exchange, and finally to the synthetic chemical product module for heat exchange.

[0039] In one embodiment of this disclosure, when the absolute value of the temperature difference between the tertiary heat source and the secondary heat source is less than 30°C, and the absolute value of the temperature difference between the secondary heat source and the primary heat source is greater than 30°C, a working medium carrying cold energy from the thermoelectric conversion device exchanges heat with the tertiary heat source, and the resulting tertiary working medium returns to the thermoelectric conversion device. Conversely, another working medium carrying cold energy from the thermoelectric conversion device does not exchange heat with the tertiary heat source but directly exchanges heat with the secondary heat source, and the resulting secondary working medium exchanges heat with the primary heat source, and the resulting primary working medium returns to the thermoelectric conversion device. For example, when the temperature of the tertiary heat source is 80°C, the temperature of the secondary heat source is 100°C, and the temperature of the primary heat source is 200°C, the heat energy from the tertiary heat source is directly transferred to the energy recovery management module for recovery, and the heat energy from the secondary heat source is transferred to the energy recovery management module after passing through the primary heat source.

[0040] When the absolute value of the temperature difference between the tertiary heat source and the secondary heat source is greater than 30°C, and the absolute value of the temperature difference between the secondary heat source and the primary heat source is less than 30°C, a working medium carrying cold energy from the thermoelectric conversion device exchanges heat with the tertiary heat source, and the resulting tertiary working medium exchanges heat with the secondary heat source, and the resulting secondary working medium returns to the thermoelectric conversion device; and / or, the resulting secondary working medium is transported to a medium-high temperature storage tank for heat storage, and the heat energy stored in the medium-high temperature storage tank is transported to the synthetic chemical module for heating; another working medium carrying cold energy from the thermoelectric conversion device does not exchange heat with the tertiary heat source and the secondary heat source, but directly exchanges heat with the primary heat source, and the resulting primary working medium returns to the thermoelectric conversion device. For example, when the temperature of the tertiary heat source is 80℃, the temperature of the secondary heat source is 180℃, and the temperature of the primary heat source is 200℃, the heat energy from the tertiary heat source is transferred to the energy recovery management module for recovery after passing through the secondary heat source, or transferred to the medium- and high-temperature storage tank for storage; the heat energy from the primary heat source is directly transferred to the energy recovery management module for recovery.

[0041] When the temperatures of the tertiary heat source and the secondary heat source of this disclosure are close, or the temperatures of the secondary heat source and the primary heat source are close, the heat energy from the tertiary and secondary heat sources can be directly transferred to the energy recovery management module. Alternatively, the heat energy from the secondary heat source can be converted into energy through medium- and low-temperature heat source conversion methods such as organic Rankine cycles. Simultaneously, a medium- and high-temperature storage tank can be matched, which can be used for preheating the inlet feed gas of the synthetic chemical module. The primary heat source of this disclosure can accept the working medium after heat exchange with the secondary and tertiary heat sources, or it can directly accept the working medium carrying cold energy from the energy recovery management module. After heat exchange, it enters the thermoelectric conversion device to achieve heat energy conversion.

[0042] In one embodiment of this disclosure, the operating method further includes: first transmitting the electrical energy from the power generation module to the power transmission module, and then transmitting the electrical energy from the power transmission module to the hydrogen production module and the feed gas compression module respectively to supply power. In this disclosure, a portion of the electrical energy output from the power transmission module enters the hydrogen production module to power the electrolysis of water for hydrogen production, and a portion enters the feed gas compression module to power the compressor.

[0043] In another embodiment, a portion of the hydrogen produced by the hydrogen production module is sent to the hydrogen storage module for storage, and another portion is sent to the feed gas compression module for compression. The thermal energy of the hydrogen storage module is transferred to the thermoelectric conversion device of the energy recovery management module through the working medium, and the working medium carrying the cold energy of the energy recovery management module is sent to the hydrogen storage module for cooling. In an optional embodiment, the hydrogen in the hydrogen storage module enters the feed gas compression module to supplement the hydrogen supply when the hydrogen production module is insufficient.

[0044] The power generation module disclosed herein is not limited to renewable energy power generation such as wind, solar, and hydro, but preferably includes one or more of wind power generation, solar power generation, hydropower generation, biomass power generation, and ocean energy power generation; the hydrogen production module disclosed herein includes a variety of hydrogen production technologies, preferably including alkaline hydrogen production, proton exchange membrane hydrogen production, and solid oxide hydrogen production. Part of the compressed raw material gas in the raw material gas compression module enters the chemical synthesis module for chemical synthesis, and the other part enters the storage tank for storage. In the synthetic chemical module, part of the product gas is returned to the synthesis unit for further reaction, and the other part enters the heat recovery unit to recover the heat energy of the product gas.

[0045] The methods provided in this disclosure are further illustrated below through examples, but this disclosure is not limited thereto.

[0046] Example 1 The specific operation method of an integrated low-temperature electrolytic ammonia synthesis system is as follows: 1. System Composition: Power generation module: Solar photovoltaic power generation system with an installed capacity of 200 MW.

[0047] Power transmission module: The 35 kV AC bus transmits the electricity from the photovoltaic power station to the hydrogen production system.

[0048] Hydrogen production module: includes 20 alkaline electrolyzers with a capacity of 1,000 cubic meters, of which four electrolyzers correspond to a set of gas-liquid separator, heat exchanger and purifier.

[0049] Hydrogen storage module: Stores hydrogen produced by part of the hydrogen production module, with a volume of 10 m³. 3 The storage pressure is 20 MPa.

[0050] Raw material gas compression module: adopts three-stage compression and interstage cooling.

[0051] Synthetic Chemicals Module: Taking ammonia synthesis as an example, it includes an inlet feed heater, a synthesis unit, a heat recovery unit, and a cooler.

[0052] The energy recovery management module includes a thermoelectric conversion device using an organic Rankine cycle, a thermal storage device using a hot water storage tank, an electrothermal conversion device using electrolytic heating wire to heat hot water, and an auxiliary cold source using a cold air blower to produce chilled water. It connects to other modules via hot and cold flow piping and electrical circuits.

[0053] The hydrogen production module undergoes a low-temperature water electrolysis process, resulting in an outlet hydrogen temperature of 80°C, serving as a tertiary heat source. The feed gas compression module has an outlet gas temperature of 120°C, acting as a secondary heat source. The ammonia synthesis module has an outlet ammonia temperature of 300°C, serving as a primary heat source. A low-temperature working medium (15°C, carrying cold energy) from the thermoelectric conversion device of the energy recovery management module is first transported to the hydrogen production module, where it exchanges heat with the tertiary heat source to obtain a tertiary working medium. This tertiary working medium is then transported to the feed gas compression module, where it exchanges heat with the secondary heat source to obtain a secondary working medium. The secondary working medium is then transported to the ammonia synthesis module, where it exchanges heat with the primary heat source to obtain a primary working medium. Finally, the primary working medium exchanges heat with the organic Rankine cycle working fluid (thermoelectric conversion device), converting it into electrical energy through a thermo-electric conversion process, thus achieving thermoelectric conversion. A portion of the electrical energy from the thermoelectric conversion device is transferred to the electrothermal conversion device to be converted into heat energy, and another portion is transferred to the auxiliary cold source for cooling, resulting in a working medium carrying cold energy. The heat energy from the electrothermal conversion device is transferred to the hot water storage tank (storage tank device) for storage. A portion of the working medium carrying cold energy is transferred to the hydrogen production module to purify hydrogen, and the remainder is transferred to the hydrogen production module, the raw material gas compression module, the chemical synthesis module, and the hydrogen storage module for cooling, respectively.

[0054] System diagram as follows Figure 1 As shown, specifically, the power generation module is electrically connected to the power transmission module, the power transmission module is electrically connected to the hydrogen production module, and the power transmission module is also electrically connected to the feed gas compression module. The hydrogen outlet of the hydrogen production module is connected to the hydrogen inlet of the hydrogen storage module through a hydrogen pipeline. The hydrogen outlet of the hydrogen storage module is connected to the feed gas inlet of the feed gas compression module. The compressed feed gas outlet of the feed gas compression module is connected to the compressed feed gas inlet of the ammonia synthesis module through a feed gas pipeline. The steam outlet of the ammonia synthesis module is connected to the steam inlet of the hydrogen production module through a steam pipeline. The hydrogen outlet of the hydrogen production module is also connected to the feed gas inlet of the feed gas compression module through a hydrogen pipeline.

[0055] The heat outlet of the hydrogen production module is connected to the heat inlet of the feed gas compression module via a heat flow pipeline. The heat outlet of the feed gas compression module is connected to the heat inlet of the synthetic chemical module via a heat flow pipeline. The heat outlet of the synthetic chemical module is connected to the heat inlet of the hydrogen production module via a heat flow pipeline.

[0056] The heat inlet of the thermoelectric conversion device is connected to the heat outlets of the hydrogen production module, the feed gas compression module, the synthetic chemical module, and the hydrogen storage module via heat flow pipes. The cold outlet of the thermoelectric conversion device is connected to the cold inlets of the hydrogen production module, the feed gas compression module, the synthetic chemical module, and the hydrogen storage module via cold flow pipes. The thermoelectric conversion device is electrically connected to the hydrogen production module, the feed gas compression module, the electrothermal conversion device, and the auxiliary cold source via circuits. The heat outlet of the electrothermal conversion device is connected to the heat inlet of the thermal storage device and the heat inlet of the hydrogen production module via heat flow pipes. The heat outlet of the thermal storage device is connected to the heat inlet of the thermoelectric conversion device and the heat inlet of the hydrogen production module via heat flow pipes. The cold outlet of the auxiliary cold source is connected to the cold inlets of the hydrogen production module, the feed gas compression module, the synthetic chemical module, and the hydrogen storage module via cold flow pipes. The hot flow pipes carry the working medium that carries heat energy, while the cold flow pipes carry the working medium that carries cold energy. A schematic diagram of the energy recovery management module is shown below. Figure 2 As shown.

[0057] The hydrogen production module includes a fuel cell stack array, an anode separator, heat exchanger 1 (first heat exchanger), a cathode separator, heat exchanger 2 (second heat exchanger), a separator, and heat exchanger 3 (third heat exchanger). The anode outlet of the fuel cell stack array is connected to the inlet of heat exchanger 1 via the anode separator. The cathode outlet of the fuel cell stack array is connected to the inlet of heat exchanger 3 via the cathode separator, heat exchanger 2, and the separator. The hydrogen outlet of heat exchanger 3 is connected to the feed gas inlet of the feed gas compression module. A schematic diagram of the hydrogen production module is shown below. Figure 3 As shown.

[0058] The feed gas compression module includes a mixing device, a buffer device, a first compressor, and a storage tank. The feed gas inlet of the mixing device is connected to the hydrogen outlet of the hydrogen production module. The mixed gas outlet of the mixing device is connected to the gas inlet of the first compressor through the buffer device. The compressed feed gas outlet of the first compressor is connected to both the inlet of the storage tank and the compressed feed gas inlet of the synthetic chemical module. The outlet of the storage tank is also connected to the compressed feed gas inlet of the synthetic chemical module. A schematic diagram of the feed gas compression module is shown below. Figure 4 As shown.

[0059] The synthetic chemical module includes a heater, a synthesis unit, a heat recovery unit, a cooler, and a second compressor. The compressed feed gas inlet of the heater is connected to the compressed feed gas outlet of the first compressor. The heater outlet is connected to the gas inlet of the synthesis unit. The product gas outlet of the synthesis unit is connected to both the gas inlet of the synthesis unit and the inlet of the heat recovery unit. The outlet of the heat recovery unit, via the cooler, is connected to the inlet of the second compressor. The outlet of the second compressor is used to collect the chemical products. A schematic diagram of the synthetic chemical module is shown below. Figure 5 As shown.

[0060] The system's operating status is shown in Table 1.

[0061] Example 2 The system and operating method of Example 1 are adopted, with the only difference being: a high-temperature water electrolysis hydrogen production process occurs in the hydrogen production module, resulting in an outlet hydrogen temperature of 750°C, serving as a primary heat source; the outlet gas temperature of the feed gas compression module is 120°C, serving as a tertiary heat source; and the outlet ammonia temperature of the ammonia synthesis module is 300°C, serving as a secondary heat source. The low-temperature working medium (15°C, i.e., a working medium carrying cold energy) from the thermoelectric conversion device of the energy recovery management module is first transported to the ammonia synthesis module for heat exchange with the tertiary heat source, yielding a tertiary working medium. This tertiary working medium is then transported to the feed gas compression module for heat exchange with the secondary heat source, yielding a secondary working medium. The secondary working medium is then transported to the hydrogen production module for heat exchange with the primary heat source, yielding a primary working medium. Finally, the primary working medium is returned to the thermoelectric conversion device, where it is converted into electrical energy through a thermo-electric conversion process, achieving thermoelectric conversion.

[0062] The system's operating status is shown in Table 1.

[0063] Comparative Example 1 The system and operating method of Example 1 are adopted, with the only difference being that the system does not have an energy recovery management module and cannot recover waste heat from the system. The system's operating status is shown in Table 1.

[0064] Table 1

[0065] As can be seen from the data in Table 1: Comparing Example 1 with Comparative Example 1, Comparative Example 1 did not use the system and operating method provided by this disclosure, and could not effectively recover system energy, resulting in high system power consumption and relatively low annual ammonia production. In contrast, Example 1 used the system and operating method provided by this disclosure, and without changing the low-temperature electrolysis technology, it could reduce energy loss through energy flow coordination and material flow coordination, thereby increasing the system's energy utilization rate by 2% and significantly reducing system power consumption while increasing annual ammonia production. Comparing Example 2 with Comparative Example 1, although the power consumption of Comparative Example 1 is relatively low, the lack of an energy recovery management module prevents effective recovery of system waste heat, resulting in low system energy utilization and a small annual ammonia production. Example 2, on the other hand, uses the system and operating method provided in this disclosure and employs high-temperature electrolysis technology. Although the power consumption is relatively higher, it can significantly improve energy utilization efficiency, greatly increase the annual ammonia production, and enhance the coordinated operation capability of the renewable energy-based electro-hydrogen synthesis chemical system.

[0066] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0067] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0068] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. An integrated electro-hydrogenation system, characterized in that, The system includes a power generation module, a hydrogen production module, a feed gas compression module, a synthetic chemical module, and an energy recovery management module. The power generation module is electrically connected to the hydrogen production module. The hydrogen outlet of the hydrogen production module is connected to the feed gas inlet of the feed gas compression module through a hydrogen pipeline. The compressed feed gas outlet of the feed gas compression module is connected to the compressed feed gas inlet of the synthetic chemical module through a feed gas pipeline. The steam outlet of the synthetic chemical module is connected to the steam inlet of the hydrogen production module through a steam pipeline. The energy recovery management module is connected to the hydrogen production module, the raw material gas compression module, and the synthetic chemical module through energy flow pipelines, respectively, and is used to recover and utilize the waste heat in the hydrogen production module, the raw material gas compression module, and the synthetic chemical module. The energy flow pipeline includes a hot flow pipeline, a cold flow pipeline, and an electrical circuit. The hot flow pipeline contains a working medium carrying thermal energy, and the cold flow pipeline contains a working medium carrying cold energy.

2. The system according to claim 1, characterized in that, The hot flow outlet of the hydrogen production module is connected to the hot flow inlet of the feed gas compression module via a hot flow pipeline. The hot flow outlet of the feed gas compression module is connected to the hot flow inlet of the synthetic chemical module via a hot flow pipeline. The hot flow outlet of the synthetic chemical module is connected to the hot flow inlet of the hydrogen production module via a hot flow pipeline.

3. The system according to claim 1, characterized in that, The system also includes a power transmission module and a hydrogen storage module, wherein the hydrogen storage module is located between the hydrogen production module and the feed gas compression module; The power transmission module is electrically connected to the power generation module and the hydrogen production module via circuits respectively; preferably, the power transmission module is also electrically connected to the raw material gas compression module via circuits. The hydrogen inlet of the hydrogen storage module is connected to the hydrogen outlet of the hydrogen production module via a hydrogen pipeline, and the hydrogen outlet of the hydrogen storage module is connected to the feed gas inlet of the feed gas compression module via a hydrogen pipeline; the hydrogen storage module is connected to the energy recovery management module via hot flow pipelines and cold flow pipelines respectively.

4. The system according to claim 3, characterized in that, The energy recovery management module also includes a thermoelectric conversion device, a heat storage device, an electrothermal conversion device, and an auxiliary cold source, wherein the heat storage device is a hot water storage tank; The heat inlet of the thermoelectric conversion device is connected to the heat outlet of the hydrogen production module, the heat outlet of the feed gas compression module, the heat outlet of the synthetic chemical module, and the heat outlet of the hydrogen storage module via heat pipes. The cold outlet of the thermoelectric conversion device is connected to the cold inlet of the hydrogen production module, the cold inlet of the feed gas compression module, the cold inlet of the synthetic chemical module, and the cold inlet of the hydrogen storage module via cold pipes. The thermoelectric conversion device is electrically connected to the hydrogen production module, the feed gas compression module, the electrothermal conversion device, and the auxiliary cold source via circuits. The heat outlet of the electrothermal conversion device is connected to the heat inlet of the thermal storage device and the heat inlet of the hydrogen production module through a heat pipe. The heat outlet of the thermal storage device is connected to the heat inlet of the thermoelectric conversion device and the heat inlet of the hydrogen production module through heat pipes. The cold flow outlet of the auxiliary cold source is connected to the cold flow inlet of the hydrogen production module, the cold flow inlet of the feed gas compression module, the cold flow inlet of the synthetic chemical module, and the cold flow inlet of the hydrogen storage module via cold flow pipelines.

5. The system according to claim 1, characterized in that, The hydrogen production module includes a fuel cell array, an anode separator, a first heat exchanger, a cathode separator, a second heat exchanger, a separator, and a third heat exchanger. The anode outlet of the fuel cell array is connected to the inlet of the first heat exchanger via the anode separator. The cathode outlet of the fuel cell array is connected to the inlet of the third heat exchanger via the cathode separator, the second heat exchanger, and the separator. The hydrogen outlet of the third heat exchanger is connected to the feed gas inlet of the feed gas compression module. The raw material gas compression module includes a mixing device, a buffer device, a first compressor, and a storage tank. The raw material gas inlet of the mixing device is connected to the hydrogen outlet of the hydrogen production module. The mixed gas outlet of the mixing device is connected to the gas inlet of the first compressor through the buffer device. The compressed raw material gas outlet of the first compressor is connected to the inlet of the storage tank and the compressed raw material gas inlet of the synthetic chemical module, respectively. Preferably, the outlet of the storage tank is also connected to the compressed raw material gas inlet of the synthetic chemical module. The chemical synthesis module includes a heater, a synthesis device, a heat recovery unit, a cooler, and a second compressor. The compressed raw material gas inlet of the heater is connected to the compressed raw material gas outlet of the first compressor. The outlet of the heater is connected to the gas inlet of the synthesis device. The product gas outlet of the synthesis device is connected to both the gas inlet of the synthesis device and the inlet of the heat recovery unit. The outlet of the heat recovery unit is connected to the inlet of the second compressor via the cooler. The outlet of the second compressor is used to collect chemical products.

6. A method for operating the system according to any one of claims 1 to 5, characterized in that, The operating method includes: transmitting the electrical energy output by the power generation module to the hydrogen production module; transmitting the hydrogen produced by the hydrogen production module to the raw material gas compression module for compression to obtain compressed raw material gas; transmitting the compressed raw material gas into the chemical synthesis module for chemical synthesis; and returning the saturated steam generated by the chemical synthesis module to the hydrogen production module for continued use. The thermal energy from the hydrogen production module, the feed gas compression module, and the synthetic chemical module is transferred to the energy recovery management module via a working medium for energy conversion and / or energy storage. At least one of the thermal energy, cold energy, and electrical energy generated by the energy recovery management module is then transferred to at least one of the hydrogen production module, the feed gas compression module, and the synthetic chemical module for reuse.

7. The operating method according to claim 6, characterized in that, The energy recovery management module includes a thermoelectric conversion device, a thermal storage device, an electrothermal conversion device, and an auxiliary cold source; The method includes: The thermal energy from the hydrogen production module, the feed gas compression module, and the chemical synthesis module can be used for at least one of the following: - The working medium is delivered to the thermoelectric conversion device of the energy recovery management module and converted into electrical energy, thus obtaining a working medium carrying cold energy; - The energy is transported to the thermal storage device of the energy recovery management module via the working medium for storage; The electrical energy from the thermoelectric conversion device is used for at least one of the following: -Power is supplied to the hydrogen production module to produce hydrogen through water electrolysis. - The gas is supplied to the raw material gas compression module to power the first compressor. - It is fed into an electrothermal conversion device and converted into heat energy, and - It is delivered to the auxiliary cold source to provide power for electrical cooling and to obtain a working medium carrying cold energy; The working medium carrying cold energy is respectively delivered to the hydrogen production module, the raw material gas compression module, the synthetic chemical module, and the hydrogen storage module for cooling; The electrical energy supplied to the electrothermal conversion device is converted into heat energy, and the converted heat energy is used for at least one of the following: - The heat is transported to the heat storage device via a working medium for heat storage. -Heating is supplied to the hydrogen production module via the working medium; To use the thermal energy stored in the thermal storage device for at least one of the following: -The heat energy is supplied to the thermoelectric conversion device through the working medium. -Heating is supplied to the hydrogen production module via the working medium.

8. The operating method according to claim 7, characterized in that, The operating method further includes dividing the heat sources in the system into primary heat sources, secondary heat sources and tertiary heat sources. The heat sources in the system include one or more of the hydrogen production module outlet stream, the raw material gas compression module outlet gas and the synthetic chemical product module outlet stream, and the temperatures of the primary heat sources, secondary heat sources and tertiary heat sources decrease sequentially. The working medium carrying cold energy from the thermoelectric conversion device first exchanges heat with the tertiary heat source to transfer the tertiary heat stored in the tertiary heat source to the working medium, forming a tertiary thermal working medium; the tertiary thermal working medium then exchanges heat with the secondary heat source to transfer the secondary heat stored in the secondary heat source to the tertiary thermal working medium, forming a secondary thermal working medium. The secondary working medium exchanges heat with the primary heat source to transfer the primary heat stored in the primary heat source to the secondary working medium, forming the primary working medium; the primary working medium is then returned to the thermoelectric conversion device. Preferably, the temperature of the working medium carrying cold energy is 7~15℃, the temperature of the primary heat source is 200~800℃, the temperature of the secondary heat source is 95~200℃, and the temperature of the tertiary heat source is 20~95℃. More preferably, when the electrolysis temperature of the hydrogen production module is 700~800℃, the hydrogen gas at the outlet of the hydrogen production module is a primary heat source, the chemical product at the outlet of the synthetic chemical product module is a secondary heat source, and the mixed gas at the outlet of the raw material gas compression module is a tertiary heat source. When the electrolysis temperature of the hydrogen production module is 70~95℃, the chemical product outlet of the synthetic chemical product module is the primary heat source, the mixed gas outlet of the raw material gas compression module is the secondary heat source, and the hydrogen outlet of the hydrogen production module is the tertiary heat source.

9. The operating method according to claim 8, characterized in that, When the absolute value of the temperature difference between the tertiary heat source and the secondary heat source is less than 30°C, and the absolute value of the temperature difference between the secondary heat source and the primary heat source is greater than 30°C, a working medium carrying cold energy from the thermoelectric conversion device exchanges heat with the tertiary heat source, and the resulting tertiary heat working medium returns to the thermoelectric conversion device. The other working medium carrying cold energy from the thermoelectric conversion device does not exchange heat with the tertiary heat source, but directly exchanges heat with the secondary heat source. The resulting secondary working medium exchanges heat with the primary heat source, and the resulting primary working medium returns to the thermoelectric conversion device. When the absolute value of the temperature difference between the tertiary heat source and the secondary heat source is greater than 30°C, and the absolute value of the temperature difference between the secondary heat source and the primary heat source is less than 30°C, a working medium carrying cold energy from the thermoelectric conversion device exchanges heat with the tertiary heat source, and the resulting tertiary working medium exchanges heat with the secondary heat source, and the resulting secondary working medium returns to the thermoelectric conversion device; and / or, the resulting secondary working medium is transported to a medium-high temperature storage tank for heat storage, and the heat energy stored in the medium-high temperature storage tank is transported to the synthetic chemical module for heating; another working medium carrying cold energy from the thermoelectric conversion device does not exchange heat with the tertiary heat source and the secondary heat source, but directly exchanges heat with the primary heat source, and the resulting primary working medium returns to the thermoelectric conversion device.

10. The operating method according to claim 7, characterized in that, The operating method further includes: first transmitting the electrical energy from the power generation module to the power transmission module, and then transmitting the electrical energy from the power transmission module to the hydrogen production module and the feed gas compression module respectively to supply power; and / or, A portion of the hydrogen produced by the hydrogen production module is transported to the hydrogen storage module for storage, and another portion is transported to the feed gas compression module for compression; the thermal energy of the hydrogen storage module is transported to the thermoelectric conversion device of the energy recovery management module through the working medium, and the working medium carrying cold energy of the energy recovery management module is transported to the hydrogen storage module for cooling; Optionally, the hydrogen in the hydrogen storage module can be supplemented by entering the feed gas compression module when the hydrogen production module's supply is insufficient.

11. The operating method according to claim 6, characterized in that, The power generation module uses renewable energy to generate electricity, preferably including one or more of wind power, solar power, hydropower, biomass power and ocean energy power; The hydrogen production methods of the hydrogen production module include alkaline hydrogen production, proton exchange membrane hydrogen production, and solid oxide hydrogen production. Part of the compressed raw material gas in the raw material gas compression module enters the chemical synthesis module for chemical synthesis, and the other part enters the storage tank for storage. In the synthetic chemical module, part of the product gas is returned to the synthesis unit for further reaction, and the other part enters the heat recovery unit to recover the heat energy of the product gas.

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