14 results about "Thermochemical cycle" patented technology

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 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.

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 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 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.

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.