4282results about "Hydroxy compound preparation" patented technology

The invention relates to the technical field of methanol production, and discloses an efficient gas-liquid distribution device for a methanol synthesis reaction tower. The liquid distribution assembly is used for distributing a catalyst; the filler assembly is used for promoting gas-liquid contact; when the liquid distribution assembly runs, the liquid distribution assembly drives the atomization assembly to atomize the catalyst flowing on the inner wall of the tank body; the liquid distribution assembly comprises a rotating shaft, the rotating shaft is rotationally installed in the tank body, a wind wheel is fixedly connected to the rotating shaft, a liquid disc is fixedly connected to the top end of the rotating shaft, a plurality of first spray heads are hinged to the liquid disc, and hoses are arranged between the first spray heads and the liquid disc. Through the arrangement of the liquid distribution assembly, the multiple first spray heads can swing in a reciprocating mode in the rotating process, so that the spraying range of the first spray heads is expanded, the situation that spraying blind areas occur in the tank body is avoided, catalysts in the tank body are distributed more evenly, and the gas-liquid contact efficiency is improved.

The invention discloses a large-aperture aluminum oxide loaded copper-based catalyst as well as preparation and application thereof. The large-aperture alumina-loaded copper-based catalyst comprises a large-aperture alumina carrier, and copper oxide and lanthanum oxide loaded on the surface of the large-aperture alumina carrier, the large-aperture alumina-loaded copper-based catalyst is granular, the specific surface area is 250-500 m < 2 > / g, the pore volume is 1.0-2.0 cm < 3 > / g, the average aperture is 16-30 nm, and the pore diameter of the large-aperture alumina-loaded copper-based catalyst is 20-30 nm. The large-aperture alumina supported copper-based catalyst comprises the following components in percentage by mass: 79%-98.9% of a large-aperture alumina carrier, 0.1%-6% of copper oxide and 1%-15% of lanthanum oxide. The large-aperture aluminum oxide loaded copper-based catalyst disclosed by the invention shows relatively high catalytic activity and higher alcohol selectivity in a reaction for preparing higher alcohol from ethanol, and particularly has relatively high C6-C10 fatty alcohol selectivity.

The invention relates to a preparation method and application of a porous material for preparing methanol through carbon dioxide adsorption and conversion. When the material is prepared, firstly, 4, 4 '4' '-(1, 3, 5-triazine-2, 4, 6-trimethylene) triphenylamine and 1, 2-acenaphthequinone are treated in a mixed solvent containing dioxane / acetonitrile / 6M acetic acid, and AT-COF is obtained; further synthesizing by adopting an impregnation method to obtain IrRu-COF; and finally, uniformly mixing the active gamma-aluminum oxide and the IrRu-COF material to form a carrier dispersion liquid, and then carrying out PEI loading, vacuum impregnation, washing and drying to obtain the PEI functionalized gamma-Al2O3 / COF composite catalyst. The technical closed loop from low-concentration CO2 capture to solar driven conversion is realized, the process flow is simple, and the energy consumption is low.

The invention relates to an ammonia distillation-polymerization carbonization one-step preparation method and application of a carbon-modified copper-silicon catalyst. According to the method, carbon is introduced through aldol condensation on the basis of an ammonia distillation method Cu / SiO2 catalyst, and a carbon modified Cu / Si C-x catalyst is prepared; the proper carbon content can promote dispersion of copper on the surface, increase the proportion of Cu < + > / (Cu < + > + Cu0) and remarkably increase the number of Cu < + > sites on the surface of the catalyst, so that the catalytic performance of the catalyst is improved. According to the method, the purpose of carbon modification is achieved without any template agent or acid-base etching agent, a good methyl laurate hydrogenation effect is achieved, and meanwhile the catalyst preparation process is environmentally friendly.

The invention relates to the technical field of electric energy storage systems, in particular to an offshore wind-solar hydrogen storage ammonia-alcohol-based constructed network control system and a broadband oscillation prevention and control method. Comprising an offshore hydrogen-ammonia-alcohol base, an offshore wind power base, an offshore photovoltaic base, an inverter station, an offshore wind-light base energy storage power station, a booster station, a network-forming type energy storage phase modulation power station and a broadband oscillation control and prevention device, so that the network-forming type energy storage control research of the offshore wind-light hydrogen-ammonia-alcohol multi-energy complementary base can be carried out under low-short-circuit-ratio access and isolated network operation. Voltage, frequency and short-circuit capacity adjustment and inertia supporting are achieved, oscillation prevention and control can be carried out, and the purposes of power grid supporting optimization adjustment and oscillation treatment are achieved; meanwhile, multi-energy complementation is achieved, the energy utilization rate is increased, hydrogen ammonia alcohol can be prepared through green energy, and carbon emission is reduced. Therefore, the problems of poor frequency stability, weak voltage supporting capability, serious weak power grid oscillation and the like in the prior art are solved.

The invention discloses a capacity configuration optimization method for preparing methanol by coupling wind-solar hydrogen production with biomass gasification, belongs to the field of methanol preparation, and develops a comprehensive optimization framework to evaluate the technical economic feasibility of renewable methanol production. According to the framework, renewable energy power generation, an energy storage technology, hydrogen production through water electrolysis and methanol synthesis are integrated together, so that a production system with cost effectiveness is constructed. And establishing an optimization model to determine the optimal investment and operation strategy of green methanol production. According to the model, investment and operation decisions of a plurality of system components are considered, and a series of decision variables are set. Through the solution of the optimization model, the problem of insufficient economic evaluation and comparison technology of synthesizing methanol from renewable energy sources is solved, a scientific basis is provided for a project in planning, design and decision-making stages, and the development of the field of synthesizing methanol from renewable energy sources is promoted.

The invention discloses a supported nickel catalyst for preparing 1, 3-propylene glycol through hydrogenation of 3-hydroxypropionaldehyde as well as a preparation method and application of the supported nickel catalyst, and relates to the technical field of catalysts. The modified long-chain multi-carbon inducer is used, and a special long-chain molecular structure and a branched chain group of the inducer can effectively and selectively adsorb and occupy a micropore impregnation site; the preparation method has the beneficial effects that more active component nickel species are obviously promoted to be dispersed in main reaction confinement spaces such as mesopores and macropores and interact with the carrier to form effective active sites, and active component steeping liquor is inhibited from entering micropore channels due to capillary action; the active site failure caused by agglomeration of nickel species in micropores in the subsequent drying and roasting process of the catalyst precursor is avoided, the efficient and directional reaction is ensured, the generation of by-products is greatly reduced, the pressure is relieved for the subsequent product rectification separation, and the final product purity is improved. The catalyst provided by the invention can still keep an excellent catalytic effect when the air speed of a 3-hydroxypropionaldehyde solution is increased to 6.5 h <-1 >.

A method for Carbon Dioxide (CO2) production comprising producing super-heated steam, utilizing a small modular nuclear reactor power plant system, receiving Sodium Formate (HCOONa) into a first reaction chamber, the first reaction chamber receiving a first portion of the super-heated steam at a first temperature, decomposing the Sodium Formate (HCOONa) into Sodium Oxalate ((COO)2Na2) and Hydrogen (H2), receiving the Sodium Oxalate ((COO)2Na2) into a second reaction chamber, the second reaction chamber receiving a second portion of the super-heated steam at a second temperature, decomposing the Sodium Oxalate ((COO)2Na2) into Sodium Oxide (Na2O), Carbon Monoxide (CO), and Carbon Dioxide (CO2).

Various aspects of this disclosure relate to methods to lower the activation energy of the cannabinoid decarboxylation reaction by performing the decarboxylation reaction in the gas phase.

The invention relates to a preparation method and application of a hydrothermal ammonolysis lignin carbon-based multi-metal catalyst. The Ni-N-C structure is constructed by a hydrothermal nitrogen doping method to enhance the synergistic effect of the catalytic active component and the lignin carbon-based carrier, and Zn is doped to regulate and control the electronic structure of Ni and effectively inhibit hydrogenolysis and methanation of carbon-carbon bonds in the reaction process, so that the catalytic activity of the catalyst and the selectivity of the product are improved. According to the catalyst obtained by the preparation method, the ethanol conversion rate can reach 69.4%, the yield of higher alcohols can reach 50.3%, the selectivity of gas byproducts is only 2.4%, the catalytic effect is good, and the problems that an existing traditional ethanol Guerbet coupling catalyst is low in ethanol conversion rate, tedious in synthesis process, poor in stability and the like can be effectively solved.

The invention relates to a method for synthesizing a high-value product by using refinery furnace gas, which comprises the following steps: purifying refinery crude furnace gas, feeding the purified refinery crude furnace gas into a chemical looping three-stage normal-pressure reactor, respectively obtaining near-pure carbon dioxide, nitrogen and hydrogen products in each stage of flow, and adjusting a gas framework by using the near-pure hydrogen product obtained by reforming coke oven gas as a supplementary hydrogen source, after reaching the standard of the mixed raw material, pressurizing and feeding into a synthesizer, and carrying out gas-liquid separation to obtain a methanol or ammonia product. The method solves the problem that carbon dioxide and nitrogen cannot be utilized when the traditional refinery furnace gas replaces coal-based carbon monoxide to synthesize high-value products through chemical carbonylation; part of coke oven process tail end product coke oven gas is consumed, and the defect that a cheap hydrogen source needs to be supplemented due to unmatched raw material structures in the technological process is overcome; and the tail gas and low-grade heat recycling process in each stage of production process is also optimized, and near-zero emission in the life cycle and gradient utilization of chemical energy are realized.

This invention discloses a method for preparing a CuZnAlGa-based layered double hydroxide (TLH)-derived catalyst for methanol production from carbon dioxide-rich syngas. Using Cu, Zn, Al, and Ga metal salts as precursors, Na₂CO₃ and NaOH as precipitants, and a mixed alcohol-water solution as an auxiliary solvent, co-precipitation is performed under controlled temperature and pH to obtain a LDH-like catalyst precursor. After high-temperature calcination and in-situ reduction in a hydrogen atmosphere, a layered framework structure of Cu nanoparticles immobilized by oxides is obtained. The LDH-like structure provides lattice confinement, preventing Cu particle aggregation, and the interaction between Cu and the oxides enhances the catalyst surface's adsorption capacity for CO and CO₂, thereby improving the activity and stability of methanol production from carbon dioxide-rich syngas.

The invention relates to a fly ash-based MOFs adsorption-catalysis material integrated preparation method, and belongs to the field of solid waste treatment and resource utilization. The material takes industrial solid waste fly ash as a matrix, and is prepared by the following steps: firstly, carrying out alkali modification and silane coupling agent surface activation treatment on fly ash to form a high-activity matrix; then loading a metal organic framework (MOFs) on the surface of the activated fly ash through an in-situ synthesis process to form a porous composite carrier; the integrated material with CO2 adsorption and catalytic conversion functions is further prepared through impregnation of a copper-based active component and a high-temperature calcination process. According to the invention, the problems of high energy consumption, high cost and low comprehensive utilization rate of fly ash of the traditional CO2 capture and utilization technology (ICCU) are solved, high-valued resource utilization of industrial solid waste and efficient capture and conversion of CO2 are synchronously realized, and the method has dual values of environmental protection and economy.

The invention discloses a large-aperture composite oxide catalyst, a preparation method thereof and a method for preparing higher alcohol from ethanol. The large-aperture composite oxide catalyst comprises copper oxide, lanthanum oxide and aluminum oxide. The large-aperture composite oxide catalyst is prepared by a coprecipitation method, and a nonionic surfactant is added as a pore-enlarging agent in the preparation process. The invention provides a method for preparing higher alcohol from ethanol, a reaction device adopted by the method comprises a main reactor and an auxiliary reactor which are sequentially connected in series, the main reactor is filled with the large-aperture composite oxide catalyst in the first aspect, the auxiliary reactor is filled with a Cu-Zn-Al composite oxide catalyst for aldehyde ester hydrogenation, and the Cu-Zn-Al composite oxide catalyst is used for hydrogenation of higher alcohol. According to the method, the ethanol conversion rate and the yield of high-carbon fatty alcohol with more than C6 are improved.

The invention discloses a preparation method of a high-selectivity and high-strength methanol synthesis catalyst, and belongs to the technical field of catalysts. The method adopts a three-step precipitation method to prepare a catalyst precursor, specifically, after zirconium and aluminum form a precipitate 1 together, zinc continues to precipitate on the basis of the precipitate 1 to form a precipitate 2, and finally copper, zinc and aluminum continue to precipitate on the basis of the precipitate 2. The finally prepared methanol synthesis catalyst has excellent selectivity and strength while having low-temperature activity and stability. The methanol synthesis catalyst prepared by the method can be widely applied to methanol synthesis devices with annual output of 600,000 tons and above.

The present invention discloses a pretreatment method and application of an alumina-supported copper oxide-rare earth metal oxide catalyst. The pretreatment method is as follows: adding the alumina-supported copper oxide-rare earth metal oxide catalyst used for the reaction of ethanol to higher alcohols into a mixture of one or several C1-C8 alcohols, impregnating at 10-90 °C for 1-24 h, filtering to remove the excess alcohol after impregnation is completed, and then drying in an oven at 40-200 °C for 1-24 h to complete the pretreatment of the catalyst. The present invention provides the application of the alumina-supported copper oxide-rare earth metal oxide catalyst pretreated by the pretreatment method in the reaction of ethanol to higher alcohols. The pretreatment method of the present invention significantly increases the selectivity of the product higher alcohols and keeps the conversion rate of ethanol unchanged or slightly improved, thus solving the problem that it is difficult to balance both the conversion rate and selectivity in the prior art.

The invention provides a catalyst for preparing methanol through carbon dioxide hydrogenation and a preparation method of the catalyst. The catalyst is prepared from an active component and an auxiliary agent and / or a modifier, the active component is CuO or In2O3; the auxiliary agent is one or more of ZnO (zinc oxide), ZrO2 (zirconium oxide) and Al2O3 (aluminum oxide); and the modifying agent is one or more of La2O3, Y2O3 and CeO2. The catalyst is prepared by adopting a single-step coprecipitation method, the preparation process is greatly simplified, the preparation cost is greatly reduced, the large-scale production potential is achieved, the CO2 catalytic efficiency can be improved by 1-5%, and the methanol yield can be improved by 1-10%. The composition of the catalyst can be flexibly regulated and controlled, various catalysts with excellent performance can be obtained, and the most suitable catalyst can be conveniently selected according to the working condition environment in actual production.

The invention discloses a copper-silicon catalyst as well as a preparation method and application thereof, and the copper-silicon catalyst comprises the following components in percentage by weight: 43-79wt% of silicon dioxide; the content of copper oxide is 15-35 wt%; the content of the auxiliary agent A is 3-10 wt%; the auxiliary agent B accounts for 3-12 wt%; the auxiliary agent A comprises one or more of alkali metal or alkaline earth metal oxides; and the auxiliary agent B comprises one or more of VB to VIIB group metal oxides. The raw materials of the catalyst are cheap and easy to obtain, the reaction condition is mild, the catalyst is environment-friendly, and the prepared catalyst is small in copper species particle size, high in dispersity, high in conversion rate and selectivity and good in stability.

The invention discloses a method for preparing aviation kerosene (aromatic hydrocarbon components) from biogas. The method comprises the following steps: separating biogas to obtain methane and carbon dioxide, and then carrying out a two-step chemical reaction process. The method comprises the following steps: firstly, carrying out dehydrogenation aromatization on methane to obtain aromatic hydrocarbon mainly containing benzene and hydrogen, and separating methane for circulating dehydrogenation aromatization reaction; then hydrogen and aromatic hydrocarbon are merged into carbon dioxide, and the polysubstituted aromatic hydrocarbon is obtained by coupling methanol synthesis and alkylation reaction of benzene without external source hydrogen. The method provided by the invention avoids the problem of low selectivity of aviation kerosene fraction hydrocarbons in a route of Fischer-Tropsch synthesis after methane and carbon dioxide are converted into synthesis gas. According to the conversion method for highly coupling the reaction processes, a new route for producing sustainable aviation kerosene from biogas is developed.

The invention provides a novel chiral ferrocene bridged binaphthyl skeleton phosphine ligand and application thereof. The ligand has the advantages of low cost, simplicity in synthesis, air stability and the like. The ligands have good catalytic activity and enantioselectivity in the asymmetric hydrogenation reaction of ketone, and have certain industrial application prospects in the synthesis of pharmaceutical molecules.

The invention provides a methanol production system comprising a reverse water gas reaction module having a first in-situ separation reactor configured to perform reverse water gas conversion of carbon dioxide and hydrogen, generate and in-situ separate carbon monoxide and water, a methanol synthesis module connected to the reverse water gas reaction module, and the second in-situ separation module is provided with a second in-situ separation reactor, and the second in-situ separation reactor is configured to generate and separate methanol in situ by utilizing the carbon monoxide generated by the reverse water gas reaction module to react with hydrogen. According to the scheme provided by the invention, a two-step methanol preparation process and the in-situ separation type reactor are organically coupled, so that the conversion of carbon dioxide can be completed under a relatively mild working condition; the problems of low one-way conversion rate, high recycling compression work and the like in methanol preparation through carbon dioxide hydrogenation are solved; the energy consumption for separating water and methanol is saved; the methanol production cost is further reduced, and the reliability and economy of the system are improved.

The invention relates to the field of catalysts, and discloses a hydrogenation catalyst, a preparation method and application thereof, and a method for preparing alpha-methylbenzyl alcohol, the hydrogenation catalyst comprises a hydrogenation active component and a SiO2 carrier; the surface of the catalyst is modified by siloxane groups. The hydrogenation catalyst has the characteristics of high low-temperature hydrogenation activity and long service life. The hydrogenation catalyst is used in a liquid phase hydrogenation reaction and has high catalytic activity, so that a low-temperature liquid phase reaction can be better carried out, for example, the hydrogenation catalyst is used in preparation of alpha-methylbenzyl alcohol, the raw material acetophenone can obtain a high conversion rate, the alpha-methylbenzyl alcohol has high selectivity, and meanwhile, the hydrogenation catalyst is long in service life.

The invention provides an energy system for synthesizing green methanol based on biomass gasification and oxygen-enriched combustion, and belongs to the technical field of new energy. The energy system comprises an electrolysis system, an oxygen-enriched combustion system, a methanol synthesis system, a biomass gasification system and an ammonia-process carbon capture unit, an oxygen outlet of the electrolysis system is communicated with the oxygen-enriched combustion system, and a hydrogen outlet of the electrolysis system is communicated with the methanol synthesis system; oxygen generated by the electrolysis system is supplied to the biomass oxygen-enriched combustion system for supporting combustion, and hydrogen is supplied to the methanol synthesis system; a hydrogen outlet of the biomass gasification system is communicated with the methanol synthesis system; a carbon dioxide outlet of the oxygen-enriched combustion system is communicated with the methanol synthesis system through the ammonia-process carbon capture unit; the material energy flow of the energy system is adjusted through hydrogen generated by the biomass gasification system, and the adjusting flexibility of the energy system is improved; the concentration of carbon dioxide output by the oxygen-enriched combustion system is concentrated through the ammonia-process carbon capture unit, and the pretreatment requirement of methanol synthesis is met.

The invention discloses a Pt-ZnO / In2O3 catalyst for preparing methanol through hydrogenation of carbon dioxide and a preparation method of the Pt-ZnO / In2O3 catalyst, and relates to the technical field of catalyst preparation, and the preparation method comprises the following steps: preparing a ZnO / In2O3 catalyst by using a coprecipitation method; and loading platinum on the surface of the ZnO / In2O3 catalyst by an impregnation method to obtain the Pt-ZnO / In2O3 catalyst. The Pt-ZnO / In2O3 catalyst does not generate a sintering phenomenon in the use process, has long-term stability, realizes modification of the In2O3-based catalyst by adding zinc oxide, and can significantly improve the conversion rate of carbon dioxide and product selectivity.

The invention discloses a process method for preparing methanol from blast furnace gas and converter gas. The process method comprises the following steps: S1, introducing the blast furnace gas and the converter gas into a gas mixing cabinet for mixing; s2, performing pressure and cooling after mixing; s3, enabling the pressurized and cooled mixed gas to pass through a PSA (Pressure Swing Adsorption) denitrification device, and separating out nitrogen; s4, the denitrified mixed gas enters a decarburization and desulfurization device, and carbon dioxide and inorganic sulfur are separated out; s5, injecting steam into the decarburized and desulfurized mixed gas, heating, and introducing into a CO conversion device for reaction; and S6, further removing carbon dioxide and hydrogen sulfide from the reacted gas through a medium-temperature pressure swing adsorption device to obtain a mixed gas with a synthesis gas component, and introducing the mixed gas into a methanol synthesis device to synthesize methanol. Through pressurized cooling, adsorption denitrification and ammonia liquid decarburization, the CO concentration in the mixed gas is increased, carbon dioxide emission is reduced, the gas temperature is maintained through medium-temperature pressure swing adsorption, consumption is reduced, methanol is synthesized after low-steam-gas-ratio CO conversion, and high-value utilization of coal gas and emission reduction of steel plants are achieved.

The utility model discloses a heat source optimizing device for a reboiler of a methanol pre-rectifying tower, which comprises the pre-rectifying tower and the reboiler, and is characterized in that a branch pipeline is separated from the crude methanol discharge of a tower kettle and is connected with a negative pressure flash tank, and the crude methanol in the negative pressure flash tank is subjected to gas-liquid separation through flash evaporation; the bottom of the negative-pressure flash tank is connected with a methanol circulating pump, and a liquid-phase material is conveyed to a first heat exchanger at the top of the tower and returns to the negative-pressure flash tank after exchanging heat with steam at the top of the tower; a gas-phase material in the negative-pressure flash tank enters a compressor, is compressed and heated and then returns to the tower kettle of the pre-rectifying tower; according to the utility model, the process is improved by combining flash evaporation of a tower kettle discharge part with heat pump rectification, and meanwhile, the flash evaporation liquid is recycled to recycle steam heat at the top of the tower, so that the steam consumption of a reboiler of the methanol pre-rectifying tower and the use amount of circulating water at the top of the tower are effectively reduced, meanwhile, the reboiler does not need to be added, and the compression ratio of a heat pump compressor can be reduced.

The invention provides a photo-thermal fused salt energy storage coupled green methanol preparation system which comprises a reverse water-gas shift unit, a methanol synthesis unit, a photo-thermal energy storage unit, a power generation unit and an electrolytic hydrogen production unit, and the photo-thermal energy storage unit absorbs light energy and generates heat energy; a heat energy outlet of the photo-thermal energy storage unit is communicated with a heat energy inlet of the reverse water-gas conversion unit; a heat energy outlet of the reverse water-gas conversion unit is communicated with a heat energy inlet of the power generation unit; a heat energy outlet of the methanol synthesis unit is communicated with a heat energy inlet of the power generation unit; an electric energy outlet of the power generation unit is communicated with an electric energy inlet of the electrolytic hydrogen production unit, and the electrolytic hydrogen production unit generates hydrogen; the carbon dioxide and the hydrogen enter a reverse water gas shift unit to generate shift gas; and the shift gas and hydrogen enter a methanol synthesis unit to generate methanol. The system can supply power and heat to the outside, and therefore co-production of products such as hydrogen, oxygen, synthesis gas and methyl alcohol, electric power and thermal power is achieved.

The invention provides a bio-based 1, 4-butanediol composition as well as a preparation method and application thereof, and the bio-based 1, 4-butanediol composition comprises bio-based 1, 4-butanediol, 4-hydroxybutyric acid-(4-hydroxyl) butyl ester and bis (4-hydroxyl) dibutyl ether. The total mass content of 4-hydroxybutyric acid-(4-hydroxyl) butyl ester and bis (4-hydroxyl) dibutyl ether in the bio-based 1, 4-butanediol composition is 51 to 220 ppm. The bio-based 1, 4-butanediol composition has low hygroscopicity, and can maintain low water content after long-term storage; meanwhile, when the bio-based 1, 4-butanediol composition is used for polyester synthesis, the esterification time can be shortened, the reaction efficiency can be improved, side reactions can be reduced, and a polyester product with better damp-heat resistance stability can be obtained.

The invention provides a Ga-modified copper-based catalyst, a preparation method thereof and an application of the Ga-modified copper-based catalyst in preparation of methanol by hydrogenation of carbon dioxide, the Ga-modified copper-based catalyst comprises a carrier and an active component loaded on the carrier, the carrier is a Ga-modified TiO2-Al2O3 composite oxide, and the active component is a Cu oxide. The Ga-modified copper-based catalyst has the performance of catalyzing the reaction for preparing methanol through carbon dioxide hydrogenation, and methanol can be generated at high selectivity under the reaction conditions of low temperature and high pressure.

The invention relates to the technical field of new energy storage and utilization, in particular to a multi-energy coupling and utilization system and method based on salt cavern hydrogen storage, and the system comprises a hydrogen storage salt cavern, a natural gas storage salt cavern and a carbon dioxide storage salt cavern; the water electrolysis hydrogen production unit utilizes electric power to drive an electrolytic bath to produce hydrogen, and the hydrogen is compressed and stored in a hydrogen storage salt cavity; the fuel cell power generation unit takes out hydrogen from the hydrogen storage salt cavern, generates power by using the hydrogen and transmits the power to a power grid; the natural gas blending combustion unit is used for mixing hydrogen in the hydrogen storage salt cavern and natural gas in the natural gas storage salt cavern according to a target proportion to form mixed gas, and sending the mixed gas into a natural gas pipeline network for blending; and the methanol synthesis unit is used for mixing hydrogen in the hydrogen storage salt cavern and carbon dioxide in the carbon dioxide storage salt cavern, preparing synthesis gas through a reverse water-gas shift reaction, and synthesizing methanol by using the synthesis gas. Therefore, the problems that the energy conversion efficiency is low, hydrogen, natural gas and carbon dioxide face challenges in space and the like are solved.