32 results about "Thermochemical cycle" patented technology

The invention belongs to the technical field of industrial waste heat resource utilization, and provides a hydrogen-fused salt energy storage coupled industrial waste heat recovery hydrogen production system and method, a fused salt energy storage subsystem comprises an energy storage module and a waste heat heat exchange module which are connected with each other, and a thermochemical circulation subsystem adopts a reactor; the reactor adopts a horizontal fixed bed reactor, and CaO-Ca (OH) 2 particles are filled in the reactor; a heat absorption stage: the high-temperature molten salt flows through a reactor jacket, a bed layer is heated to a first preset temperature, Ca (OH) 2 is subjected to a decomposition reaction, and nitrogen is introduced in the reaction process; a heat release stage: introducing water vapor into the reactor, carrying out hydration reaction on the water vapor and CaO, heating the fused salt to a second preset temperature by virtue of reaction heat release, and providing a heat source for the electrolytic hydrogen production subsystem; through coupling of a fused salt energy storage system and CaO-Ca (OH) 2 thermochemical circulation, efficient recovery and utilization of low-grade waste heat at the temperature of 300-500 DEG C are achieved, an electrolytic bath is driven to produce hydrogen at low cost, the heat efficiency of the system is improved to 75% or above, and green hydrogen self-supply in the high-energy-consumption industry is promoted.

The invention relates to the technical field of energy systems, in particular to a methane gradient utilization system based on SOFC (solid oxide fuel cell) and copper chloride circulation, comprising a methane reforming and SOFC power generation unit for converting methane fuel into electric energy and combusting anode tail gas to generate high-temperature flue gas; the copper-chlorine circulating hydrogen production unit is connected with a high-temperature flue gas pipeline of the methane reforming and SOFC power generation unit, heat energy of the high-temperature flue gas is used for driving a copper-chlorine thermochemical circulating reaction, and hydrogen is prepared by taking water as a raw material; and the waste heat power generation and recovery unit is connected with a cathode tail gas pipeline of the methane reforming and SOFC power generation unit and a tail gas outlet pipeline of the copper chloride circulation hydrogen production unit, and is used for carrying out power generation and heat supply on waste heat in a cascade recovery system. According to the system, grade alignment and gradient utilization of energy are achieved, high-temperature waste gas of the SOFC system is sequentially used for driving copper-chlorine hydrogen production, ORC power generation and hot water supply, and the comprehensive utilization efficiency of energy is remarkably improved.

The invention discloses a pyrolysis gas-assisted thermochemical cycle hydrogen production test system and an operation method. The test system comprises a steam system, a gas path system, a reaction system and a separation detection system. The reaction system adopts a first reaction system and a second reaction system which are arranged in parallel and can alternately carry out reduction and oxidation reactions. And the gas path system can selectively introduce pyrolysis gas or nitrogen into the reaction system through valve switching. According to the operation method, by optimizing water vapor oxidation conditions, an air oxidation stage in a traditional process is omitted, and energy consumption is reduced; and nitrogen purging is adopted during switching of the reaction stages, so that the explosion risk is thoroughly eliminated, and the safety is guaranteed. According to the invention, continuous, efficient and safe circulating hydrogen production is realized, and a reliable scheme is provided for industrial application.

The invention discloses a novel gallium iron garnet oxygen carrier, a preparation method and application, the oxygen carrier is gallium iron garnet, the chemical formula of the oxygen carrier is Y3FexGayAl5-x-yO12, x is 0-3, and y is 0-3; when the oxygen carrier is used in the two-step thermochemical cycle process, part of Fe is reduced into metal elementary substance Fe in situ, and Fe < 0->-Ov-Ga < delta + > is formed by the metal elementary substance Fe and Ga < delta + > in the carrier and serves as a main active site. Gallium iron garnet shows more excellent reaction activity, selectivity and cycle stability in a two-step thermochemical cycle reaction for thermal cracking of water and carbon dioxide. The oxygen carrier is simple in raw material, easy to prepare and very good in application prospect.

A method can include performing a series of reactions in a closed cycle, the series of reactions consisting of a hydrolysis reaction where a redox reagent is oxidized to a corresponding oxidized redox reagent with water contemporaneously with the production of hydrogen; and a reduction reaction where the oxidized redox reagent is reduced to the redox reagent using a sulfurous reactant contemporaneously with production of sulfur dioxide.

The invention provides an efficient heat exchange multi-tube thermochemical circulation hydrogen production device. The device comprises a device lower section, a device middle section and a device upper section which are connected in sequence, a heat exchange tube is arranged in the device lower section, a reaction gas inlet is formed in the bottom of the device lower section, and a flue gas outlet is formed in the side surface of the device lower section; a filling cavity is formed in the device middle section, a porous sieve plate is arranged in the filling cavity, a first refractory ball filling layer and a second refractory ball filling layer are arranged above the porous sieve plate, and a filling opening communicated to the filling cavity is formed in the side face of the device middle section; a plurality of reaction tubes are arranged in the device upper section and filled with catalysts, outer annular baffle plates and inner annular baffle plates are alternately arranged between the reaction tubes up and down, the heat exchange tubes and the reaction tubes are communicated to the filling cavity of the device middle section, a flue gas inlet and a reaction gas inlet are formed in the side face of the device upper section, and third refractory ball filling layers are arranged on the upper portions of the reaction tubes. The device can improve the heat exchange efficiency and reduce the reaction temperature at the same time.

The application provides a parallel solar photo-thermal chemical coupling lunar surface resource utilization system and method, which mainly comprises a solar light condensing and heat collecting system, a solar light splitter, a thermal chemical reactor, a photochemical reactor, a lunar soil-based thermal chemical circulation oxygen carrier material, a lunar soil-based photochemical catalyst, a heat recovery regulation unit and a vacuum collector. The solar light condensing and heat collecting system and the solar light splitter converge the sunlight irradiated on the lunar surface and supply the sunlight to the thermal chemical reaction and the photochemical reaction, respectively. The high-temperature waste heat of the thermal chemical part is distributed by the heat recovery regulation unit, water decomposition for hydrogen and oxygen production and metal material acquisition are realized by using the lunar soil material, and lunar resource acquisition and efficient utilization are realized.

A method can include performing a series of reactions in a closed cycle, the series of reactions consisting of a hydrolysis reaction where a redox reagent is oxidized to a corresponding oxidized redox reagent with water contemporaneously with the production of hydrogen; and a reduction reaction where the oxidized redox reagent is reduced to the redox reagent using a sulfurous reactant contemporaneously with production of sulfur dioxide.

The application provides a method and device for preparing CO by using solar thermal chemical cycle, and relates to the technical field of solar fuel production. The method comprises the following steps: S1, uniformly mixing Mn2O3 and Na2CO3 pure substances according to a stoichiometric ratio to form a solid-phase mixture of Mn2O3 and Na2CO3; S2, concentrating solar energy into high-temperature heat energy in a first preset temperature range, heating the solid-phase mixture to 800-900 DEG C by using the high-temperature heat energy, and making Mn2O3 and Na2CO3 generate a high-temperature endothermic reaction under normal pressure to generate a solid-phase product NaMnO2 and a gas-phase mixture product CO2, CO and O2; S3, cooling the gas-phase mixture product CO2, CO and O2 to 40 DEG C, separating the gas-phase mixture by pressure swing adsorption to obtain CO2, CO and O2 pure substances respectively; and S4, mixing the CO2 obtained in the step S3 with CO2 from outside, preheating the mixture, fully exchanging heat with the solid-phase product NaMnO2, and making the solid-phase product NaMnO2 generate a low-temperature exothermic reaction under 300-500 DEG C and normal pressure to re-generate Mn2O3 and Na2CO3, and returning to the step S1.

The invention discloses a preparation method of reticular cerium oxide porous ceramic for thermochemical cycle hydrogen production, and belongs to a porous material technology. The method comprises the following steps: sufficiently mixing CeO2 powder with specific content, a pore forming agent, water, a dispersing agent and an adhesive to prepare cerium oxide slurry; and immersing the template into the cerium oxide slurry to ensure that the cerium oxide slurry is uniformly permeated and completely coated, curing, and then carrying out template reinforced curing, drying and high-temperature sintering to obtain the reticular cerium oxide porous ceramic. According to the method, a sacrificial template is selected and matched with cerium oxide slurry with a specific content for slurry hanging-curing, a net-shaped porous ceramic biscuit with a uniform coating, a complete structure and smooth pore channels is obtained at a time, the net-shaped cerium oxide porous ceramic with a stable structure can be prepared only through one-time high-temperature sintering, the technological process is simple, the energy consumption is low, the equipment requirement is simple, and the method is suitable for industrial production. The method has both economic applicability and popularization applicability.

The embodiment of the present application provides a kind of thermal chemical three-step cycle decomposition CO2 preparation CO method and device, the method comprises: heating manganese trioxide to first temperature, and pyrolysis explanation oxygen reaction occurs at this temperature under normal pressure, produces three manganese tetroxide and oxygen;Three manganese tetroxide is mixed with carbonate, and under the condition of second temperature and normal pressure, it is generated that manganate, carbon dioxide and carbon monoxide;Manganate is placed in carbon dioxide environment, under the condition of third temperature and preset pressure, manganate and carbon dioxide occur regeneration reaction, produce manganese trioxide and carbonate;Separate manganese trioxide and carbonate, repeat the above steps, and carry out cycle reaction.The method innovatively utilizes manganese oxide and carbonate to carry out thermal chemical three-step cycle decomposition CO2 preparation CO, effectively reduces the higher reduction reaction temperature of traditional thermal chemical cycle, improves the operating stability of working medium and reactor.

This invention discloses a nuclear power generation and hydrogen production integrated utilization system, relating to the field of nuclear power hydrogen production technology. The key technical point is that by simultaneously distributing the high-temperature thermal energy of a molten salt reactor to a supercritical carbon dioxide Brayton cycle power generation system and a three-step vanadium-chlorine thermochemical cycle hydrogen production system, a new parallel-coupled, cascaded energy conversion architecture is constructed. This fundamentally overcomes the drawback of mismatch between heat grade and energy demand in traditional series-type nuclear power integrated utilization schemes. This design not only enables efficient power generation from high-temperature thermal energy and gentle hydrogen production from mid-temperature thermal energy, but also achieves deep recovery of waste heat through an internal heat exchange network, significantly improving the overall energy utilization efficiency of the system. The invention demonstrates significant technological progress in improving energy utilization efficiency, reducing production costs, and decreasing carbon emissions, providing a practical technical path for the multi-product integrated utilization of nuclear energy and large-scale green hydrogen production.

The invention provides a low-temperature thermochemical cycle water decomposition hydrogen production device and a hydrogen production method. According to the low-temperature thermochemical cycle water decomposition hydrogen production device disclosed by the invention, the flue gas inlet is arranged for introducing high-temperature flue gas generated by biomass pyrolysis and enabling the high-temperature flue gas to directly face the heat exchange tube, so that efficient heat transfer is realized; meanwhile, a reaction gas inlet pipe is arranged at the bottom of the device and is directly connected with a heat exchange pipe, high-temperature flue gas exchanges heat with water vapor, the reaction temperature is effectively controlled within 800 DEG C, and therefore the defects that a traditional chemical circulation hydrogen production device is high in energy consumption, unstable in operation, high in maintenance cost and the like are overcome; according to the method for producing hydrogen by decomposing water through low-temperature thermochemical circulation, high-temperature flue gas which is low in price and easy to obtain is adopted as a heat source, so that unnecessary energy expenditure is saved; a gas path of high-temperature flue gas is changed through the first baffle plate and the second baffle plate, so that a heat source is utilized to the maximum extent; and the oxygen carrier is used, so that the temperature in the process of hydrogen production by thermochemical cycle decomposition of water is reduced.

This invention provides a thermochemical cycle method for hydrogen production by water splitting of manganese oxides and carbonates, comprising: heating high-valence manganese oxides to a first temperature to undergo a thermal deoxygenation reaction, generating low-valence manganese oxides and oxygen; reacting the low-valence manganese oxides generated from the thermal deoxygenation reaction with carbonates at a second temperature to generate manganite, carbon dioxide, and carbon monoxide; reacting the generated manganite with carbon dioxide at a third temperature to generate high-valence manganese oxides and carbonates; separating the carbon monoxide and carbon dioxide generated from the reaction of low-valence manganese oxides and carbonates; and reacting the carbon monoxide with water vapor in a water-vapor shift reaction to generate carbon dioxide and hydrogen. This method consumes H₂O. 2 O and thermal energy enable the phased generation of hydrogen and oxygen products. Other substances in the system are recycled through different reaction configurations, effectively overcoming the problems of high temperature, low oxygen partial pressure, and poor stability in traditional thermochemical two-step cyclic reactions.

The invention relates to a high-entropy oxide and a preparation method and application thereof, the chemical formula of the high-entropy oxide is (NiaCobCucMgdMneAf) Fe2O4, the A element is Ga element, the six-element high-entropy oxide is formed, and compared with traditional spinel, hydrogen with higher purity can be prepared in thermochemical circulation, so that the cost for separating and purifying hydrogen is reduced. The reaction temperature can be obviously reduced through methane, and the yield and the purity which exceed those of traditional ferronickel spinel can be obtained at 800 DEG C. The six-membered oxygen carrier is adopted to guarantee the stability of hydrogen yield and purity.

The utility model discloses a hydrogen generation and recovery device based on thermochemical circulation, and relates to the technical field of hydrogen production, the hydrogen generation and recovery device based on thermochemical circulation comprises a mounting plate and a reaction shell, the reaction shell is mounted on the inner wall of the mounting plate, a hydrogen generator is mounted on the surface of the top end of the reaction shell, and the hydrogen generator is mounted on the surface of the top end of the reaction shell. A discharge port is formed in the surface of the top end of the reaction shell, and a conveying pipe is mounted on the surface of the top end of the discharge port. When hot water is input into the heating plate, the heating plate can absorb heat energy and conduct the heat energy to the outer side surface of the reaction shell, and water in the reaction shell can absorb the heat energy on the surface of the reaction shell, so that reaction water is heated; therefore, the problems that in the prior art, a small-size hydrogen generation and recovery device does not have the thermochemical circulation function, hydrogen and electrolyte cannot be better heated, and the hydrogen generation efficiency is low are solved.

The present disclosure provides a method for preparing carbon monoxide by using sodium carbonate and manganese oxide thermochemical cycle, comprising: S1, mixing sodium carbonate and manganese sesquioxide, heating to make manganese sesquioxide undergo endothermic decomposition reaction to obtain manganese trioxide and oxygen; S2, heating to make manganese trioxide react with sodium carbonate to obtain NaMnO2, carbon dioxide and carbon monoxide; S3, introducing carbon dioxide to react with NaMnO2 to obtain manganese sesquioxide and sodium carbonate, which are recycled in S1 and S2. The present disclosure uses a multi-step method to prepare carbon monoxide fuel by decomposing carbon dioxide through thermochemical cycle, which can provide stable and sufficient carbon monoxide at a lower temperature, and provides a method for preparing carbon monoxide fuel through thermochemical cycle, which is simple in process, high in efficiency, zero in carbon emission, stable in operation and suitable for various operating environments.

The embodiment of the present application provides a kind of cobalt oxide and carbonate multi-step method thermochemical cycle fuel production method and device, wherein the method comprises: heating cobalt trioxide to first temperature pyrolysis, generate cobalt monoxide and oxygen;The generated cobalt monoxide is mixed with carbonate, under second temperature condition, reaction occurs, generates cobaltate and carbon monoxide;Carbon dioxide is introduced into the reaction system of cobaltate and carbon monoxide, under third temperature condition, carbon monoxide and carbon dioxide in the reaction system and cobaltate react, produce cobalt trioxide and carbonate;The generated cobalt trioxide and carbonate are used to repeat the above steps, and a cycle reaction is formed.The method effectively solves the problem of high temperature in traditional thermochemical decomposition CO2, the process is simple, without the transfer of reactants, simplifies the operation, the reaction system does not contain corrosive substances and phase change process, the requirement of system equipment is low, stability is good, and the effect of CO fuel production is stable.

A process for producing hydrogen, sulfuric acid, and sulfur dioxide (SO2) utilizes the Sulfur-Iodine (S—I) thermochemical cycle. Acid gases, typically processed in sulfur recovery units, are combusted in an acid gas burner with air, enriched air, or oxygen, without fuel gas, to produce SO2. Iodine facilitates hydrogen production.A portion or all of the acid gases are directed to the burner in accordance with the present invention. The process reduces SO2 and CO2 emissions, with produced SO2 used for fertilizer production and CO2 sent for removal or CO2 liquefaction.The generated hydrogen supplies facility needs, such as hydrotreaters, reducing external imports and operating costs.

The application discloses a photocatalysis-high-temperature thermochemical coupling fuel production system and a regulation and control method. The system comprises a solar spectrum frequency divider, a parabolic concentrator, a circular tube reactor, a high-temperature solar energy driven metal oxide thermochemical cycle fuel production device, a waste heat recovery device, a hydrogenation station, a Fischer-Tropsch synthesis device, a product separation device, a gas turbine, a power grid system and a residential and industrial park. The system couples and complements photocatalysis-high-temperature thermochemical fuel production technology, and widens the solar spectrum utilization range. Meanwhile, for the photocatalytic hydrolysis hydrogen production device, according to the solar radiation energy and the user load, the parabolic concentrator structure and the reactor operation parameters are regulated and controlled under full light conditions; for the high-temperature thermochemical fuel production device, the reactor operation parameters are regulated and controlled, so that the radiation energy input into the reactor matches the energy required by the chemical reaction, and the solar energy-fuel energy conversion efficiency of the system is improved.

The invention belongs to the technical field of solar hydrogen production, and particularly relates to a solar thermochemical cycle hydrogen production reactor which comprises a gas steam pipe and a water splitting reactor, a catalyst in the water splitting reactor is subjected to an oxidation reaction under the high-temperature condition to generate hydrogen, and the hydrogen is separated from the gas steam pipe. A reacted catalyst in the water cracking reactor flows into the catalyst regenerator through a spent inclined pipe and is subjected to a reduction reaction under a high-temperature condition to generate oxygen and a regenerated catalyst, fluidizing steam is introduced into the water cracking reactor and the catalyst regenerator, the fluidizing steam carries the catalyst to carry out a chemical reaction, and the regenerated catalyst is generated. Therefore, efficient solar hydrogen production is realized. In the catalyst regenerator, solar energy is utilized to focus high temperature, the catalyst is reduced to generate oxygen, the catalyst obtains activity again, the next round of hydrogen production reaction is circularly carried out, and a fluidized bed technology is adopted, so that the problem of sintering of high-temperature catalyst particles is avoided.

The present invention provides a thermochemical cycle hydrogen production device and a hydrogen production method. The thermochemical cycle hydrogen production device of the invention can heat the system with inexpensive biomass and the like as fuel by setting a heating chamber, which can significantly reduce the heating cost of the process (the heating temperature is below 900 °C) and expand the application range. The thermochemical cycle hydrogen production method of the present invention introduces biomass pyrolysis gas and uses an oxygen carrier in combination, further reducing the temperature of the thermochemical cycle reaction process, which helps to extend the service life of the reaction device. Compared with the conventional thermochemical cycle hydrogen production process, the fuel-assisted thermochemical cycle hydrogen production process requires a relatively low reaction temperature. In addition, compared with the conventional thermochemical cycle hydrogen production process, the fuel-assisted thermochemical cycle hydrogen production process has the advantages of low investment and operation costs and high stability.

The application discloses a method and system for preparing synthesis gas by coupling CO2 / H2O decomposition and methane reforming, and relates to the technical field of thermochemical conversion and synthesis gas preparation. The application adopts a two-step thermochemical cycle. Oxygen storage material is oxidized to form a reduced state by thermal decomposition, and the thermal energy of the released gas and the residual heat after cooling drive the dry / wet reforming of methane to generate CO and / or H2. The reduced oxygen storage material is reacted with CO2 and / or H2O to generate CO and / or H2, and the oxidation state is restored at the same time. The mixture of the two-stage products obtains synthesis gas with an adjustable H2 / CO molar ratio of 0.5-5. The application improves the energy utilization rate by heat energy recovery coupling, avoids the risk of mixing O2 with synthesis gas, and is suitable for diversified downstream chemical and energy fields.

The invention discloses a multistage condensation frequency division magnesium-chlorine cycle hydrogen production system, the system comprises a solar full-spectrum multistage condensation frequency division utilization subsystem and a magnesium-chlorine cycle hydrogen production subsystem, the solar full-spectrum multistage condensation frequency division utilization subsystem carries out solar multispectral condensation with different multiples, converts a photovoltaic available spectrum into electric energy, and carries out hydrogen-chlorine cycle hydrogen production on the magnesium-chlorine cycle hydrogen production subsystem, and the magnesium-chlorine cycle hydrogen production subsystem carries out hydrogen-chlorine cycle hydrogen production on the magnesium-chlorine cycle hydrogen production subsystem. The residual spectrum generates heat energy at different temperatures by utilizing a radiation absorber, so that full-spectrum utilization of solar energy is realized. And the magnesium-chlorine circulating hydrogen production subsystem is used for carrying out three-step magnesium-chlorine circulating reaction hydrogen production by utilizing the electric energy generated by the photovoltaic power generation assembly and the heat energy at different temperatures generated by different radiation absorbers, and the magnesium-chlorine circulating net reaction is that water is decomposed into hydrogen and oxygen. According to the energy requirement and energy quality matching principle of the whole process, solar radiation energy is reasonably adjusted through multi-stage light condensation frequency division, so that three-step magnesium-chlorine thermochemical cycle conversion is driven in a stepped mode, and stepped ordered conversion hydrogen production of solar energy is achieved.

A heliostat field is used for heating a high-temperature aerosol reactor to a set temperature range, micro-nano particles of manganese-based oxide are input into a feeding port of the high-temperature aerosol reactor, a discharging port of the high-temperature aerosol reactor is communicated with a feeding port of an adiabatic reactor through a first discharging valve, and the adiabatic reactor is communicated with a second discharging valve through a second discharging valve. Nitrogen is introduced into the nitrogen inlet, the gas outlet is communicated with a hot end inlet of the heat exchanger, and a cold end outlet of the heat exchanger is communicated with a gas inlet of the adiabatic reactor; a discharge port of the adiabatic reactor is communicated with an inlet of the separator, the separator is used for solid-gas separation, an outlet of the separator is divided into two paths, one path is communicated with the hydrogen collector, and the other path is communicated with a feed port of the high-temperature aerosol reactor through a second discharge valve. According to the invention, cyclic utilization of reaction particles in the hydrogen production process is realized, the reaction speed is accelerated, and the conversion rate is improved.

A system for producing hydrogen from water by a thermochemical cycle, for example the sulphuriodine cycle, comprises a reactor having reaction zones for implementing the reactions of the cycle. The reaction zones are interconnected by a fluid circuit and the reactor is configured to direct reaction product(s) from any reaction zone to another reaction zone to provide reactant(s) for the other reaction zone. Fluid is recirculated around the fluid circuit so that reaction product(s) from downstream reaction zone(s) are reused as reactant(s) for upstream reaction zone(s). Heat generated in reaction zone(s) is also reused in other reaction zone(s). The resulting system is energy efficient as well as being efficient in its use of reactants.

The invention relates to the technical field of energy materials, in particular to a system and a method for rapidly testing the performance of a solar thermochemical cycle material. The system comprises a gas switching subsystem, a heating subsystem and a gas analysis subsystem, wherein the heating subsystem comprises a reaction cavity for accommodating a test sample, an annular graphite electrode sleeved outside the reaction cavity, a vacuum cavity arranged outside the annular graphite electrode and a temperature controller connected with the annular graphite electrode; the annular graphite electrode is used for heating the reaction cavity in a Joule heating mode, and the temperature controller is used for controlling the heating power of the annular graphite electrode. Through a core heating structure of'reaction cavity-annular graphite electrode-vacuum cavity ', automatic switching with the gas switching subsystem at the front end and closed-loop integration of the gas analysis subsystem at the rear end, fast, accurate, wide and stable effects are cooperatively generated.

A high-entropy metal oxide photo-thermal chemical cycle direct water decomposition hydrogen production device and method comprises a hot air system, a steam system and a reaction system, a high-entropy metal oxide is arranged in the reaction system, the hot air system is used for generating high-temperature pyrolysis gas, and the steam system is used for generating steam; high-temperature pyrolysis gas and steam are respectively and alternately introduced into the two reaction systems for hot air flow and water flow, so that the two reaction systems can share the same hot air system and steam system, and meanwhile, the hot air system and the steam system can continuously perform production without shutdown; excessive high-temperature pyrolysis gas which is not reacted completely in the reaction system enters the steam preheater to exchange heat with steam, so that the steam is heated to form superheated steam. The hot air flow and the water flow can be alternately carried out through the two reaction systems, the production efficiency of the hydrogen production equipment is effectively improved, and the energy consumption of the hydrogen production equipment can be effectively reduced through heat exchange between high-temperature pyrolysis gas and steam.

The present invention relates to the use of a doped metal oxide of the perovskite class in the form of ABO3 for direct resistive heat generation and / or heat storage upon application of a voltage. Furthermore, the present invention relates to a method for a thermochemical cycle using the metal oxide according to the invention.

The invention relates to the technical field of flue gas treatment and hydrogen production, in particular to a thermochemical cycle hydrogen production system and method for HCl-containing flue gas. The Fe3O4 is cyclically generated in the at least five reaction spaces, and in the same time period, the Fe3O4 subjected to heat release in each reaction space reacts and is converted into one of a FeCl2 / FeCl3 state, the FeCl2 / FeCl3 is decomposed and converted into a non-heat-storage FeCl2 state, the non-heat-storage FeCl2 is converted into a heat-storage FeCl2 state, the heat-storage FeCl2 is hydrolyzed and converted into a high-temperature Fe3O4 state, and the high-temperature Fe3O4 is purged and converted into the heat-release Fe3O4 state. The heat accumulating type reactor is combined with online switching of fluid conveying, full cyclic utilization of reaction heat and continuous operation of thermal chemical reaction cyclic hydrogen production are achieved, and finally high-value treatment of the HCl-containing flue gas is achieved.