523 results about "Methanation" patented technology

The invention relates to an MOF confinement ruthenium cluster catalyst for methanation of carbon dioxide as well as a preparation method and application of the MOF confinement ruthenium cluster catalyst. The catalyst comprises a carrier and an active component loaded on the carrier, the carrier comprises a metal organic framework containing hydroxyl; the metal organic framework comprises UiO-66 (UiO-66); the active component comprises metal ruthenium; the active component grows in a pore channel of the carrier and forms a metal cluster. The catalyst provided by the invention realizes 100% methane selectivity and 98.4% carbon dioxide (CO2) conversion rate under the conditions of 1 MPa and 220 DEG C, is almost close to thermodynamic limit equilibrium conversion rate (99.4%) and is superior to the currently reported Ru-based CO2 methanation catalyst, and the catalyst shows good catalytic activity and structural stability in the process of continuous reaction for 650 hours. The catalyst provided by the invention has the characteristics of simple preparation method, high metal dispersibility, mild reaction conditions, high conversion rate, good selectivity, excellent stability and the like.

The invention discloses a device and a method for promoting methanation of carbon dioxide through temperature oscillation induced by laser scanning. The device comprises a reactor, a laser and a galvanometer, a transparent cover plate is arranged at the top of the reactor, an air outlet is formed in the side surface, and an objective table is arranged in the reactor; a catalyst layer is arranged above the objective table; the catalyst layer is provided with a longitudinally-penetrating gas leading-in hole, a gas flow channel is arranged in the objective table, one end of the gas flow channel is communicated with the gas leading-in hole, and the other end of the gas flow channel is communicated with the gas inlet. Introducing mixed gas containing hydrogen and carbon dioxide into a gas inlet of the reactor, changing the irradiation position of a laser beam emitted by a laser through a galvanometer, and enabling the laser beam to periodically scan and irradiate the catalyst layer to obtain methane. The surface temperature distribution of the catalyst is dynamically regulated and controlled through laser scanning, so that the temperature of a catalytic active site is continuously switched between a high temperature and a low temperature, the thermodynamic limitation of a carbon dioxide methanation reaction can be effectively reduced, and an efficient and stable carbon dioxide methanation process is realized.

The invention discloses a hydroxyl-rich ruthenium / titanium dioxide catalyst as well as a preparation method and application thereof, and the preparation method comprises the following steps: step 1, loading a ruthenium precursor on a titanium dioxide carrier by adopting an impregnation method or a deposition-precipitation method, and drying and calcining to obtain a Ru / TiO2 catalyst; and step 2, placing the Ru / TiO2 catalyst in an atmosphere environment containing water vapor or forming a physical adsorption water film on the surface of the Ru / TiO2 catalyst, and performing ultraviolet irradiation treatment to obtain the Ru / TiO2 catalyst. According to the method, water is physically adsorbed through ultraviolet light dissociation, hydroxyl is directly generated on the surface of Ru / TiO2 in an in-situ mode, the method is easy to operate, complex liquid phase treatment is not needed, and the stability of the generated hydroxyl under the subsequent high-temperature gas-solid phase hydrogen-rich reaction condition is obviously superior to that of hydroxyl introduced through a traditional method. The stable hydroxyl enriched on the surface serves as an effective Lewis base site and cooperates with a Ru active site, adsorption and activation of CO2 molecules are remarkably promoted, and therefore the catalytic activity of the CO2 methanation reaction is greatly improved.

The present invention discloses a monatomic fluid driven carbon dioxide methanation conversion system and a method of use, comprising an absorption device and a desorption conversion device, wherein the liquid outlet of the absorption device is connected to the first inlet of a heat exchanger via a first pump, the first outlet of the heat exchanger is connected to the inlet of a desorption conversion device, the liquid outlet of the desorption conversion device is connected to the second inlet of the heat exchanger via a second pump, and the second outlet of the heat exchanger is connected to the liquid inlet of the absorption device via a cooler. The use of monatomic fluid as a solvent in the present invention can not only generate electric charge and effectively solve the problem of high energy consumption caused by desorption of CO2 due to thermal desorption, but also couple thermal and electric charge effects to greatly break through the high energy consumption bottleneck caused by reaction temperature faced by traditional thermal desorption, and greatly reduce the reaction energy barrier and reaction heat. During the desorption process, the charge effect of the molecules in the solvent combined with CO2 can promote the realization of efficient methanation conversion of CO2.

The invention belongs to the technical field of alkane processing, and particularly relates to a process for preparing isopentene by dehydrogenation of isopentane, a catalyst and a tert-amyl alcohol preparation process. The process for preparing isopentene by dehydrogenation of isopentane comprises an isopentane dehydrogenation device and an isopentene separation device, in the isopentane dehydrogenation device, a dehydrogenation reactor is a fixed bed adiabatic reactor and is filled with a Pt-Sn-K / alumina type alkane dehydrogenation catalyst, the catalyst has hydromethanation performance under the CO2-containing dehydrogenation reaction condition, and the arrangement and operation of a dehydrogenation reactor group comprise a mode A, a mode B or a mode C; the isopentene separation device comprises a cooling separation system, a pressure swing adsorption separation system and an optional rectification system. The tert-amyl alcohol is further prepared from isoamylene under the conditions of a fixed bed hydration reactor, ethylene glycol monobutyl ether and other solvents, and the tert-amyl alcohol product is obtained through separation. The process is superior to the prior art on the whole, and has certain application prospects.

The invention relates to the technical field of methanol catalysts, in particular to a catalyst for improving selectivity of methanol prepared from methane through proton regulation and a preparation method. The preparation method comprises the following steps: S1, adding Zn (NO3). 6H2O into deionized water to prepare a solution, adding a sodium hydroxide solution, washing and drying to obtain a product; s2, adding a product in the step S1 into hydrogen peroxide, and then washing and drying; s3, putting a product in the step S2 into ethanol, adding APTES, washing and drying; s4, putting a product obtained in the step S3 into deionized water containing DPA-MOF, and carrying out heating reaction in a closed environment; s5, adding a sodium hydroxide solution into the solution cooled in the step S4, and washing and drying a product; and S6, dispersing the product obtained in the step S5 into a deionized water solution of ammonium nitrate, drying and calcining. The catalyst prepared by the invention has efficient selective catalysis on methanol through efficient proton affinity regulation and control.

The invention provides a ruthenium-based carbon dioxide hydrogenation catalyst based on MoS2 as well as a preparation method and application of the ruthenium-based carbon dioxide hydrogenation catalyst. The carbon dioxide hydrogenation catalyst comprises silicon dioxide, ruthenium and molybdenum disulfide, and the ruthenium and the molybdenum disulfide are loaded on the silicon dioxide. Therefore, in the carbon dioxide hydrogenation catalyst, the molybdenum disulfide is used as an auxiliary agent, so that the generation of methane (CH4) can be remarkably inhibited while a high CO2 conversion rate is maintained, the reversion of a product from CH4 leading to carbon monoxide (CO) leading is realized, and the inherent core defects that an existing Ru-based CO2 hydrogenation catalyst is too high in methanation activity, low in CO selectivity and difficult to consider activity-selectivity at the same time are overcome.

The invention belongs to the technical field of catalyst development, and relates to a cerium oxide-loaded non-noble metal catalyst for a carbon dioxide methanation reaction and a preparation method of the cerium oxide-loaded non-noble metal catalyst. The method comprises the following steps: firstly, obtaining a cerium oxide carrier through a hydrothermal reaction, secondly, impregnating non-noble metal nitrate serving as a precursor on the cerium oxide carrier through an impregnation method, and carrying out ultrasonic treatment, drying, calcining and other steps to obtain the cerium oxide supported non-noble metal catalyst. The prepared catalyst is low in cost and has excellent carbon dioxide methanation catalytic activity. By controlling the loading capacity and the loading type of the non-noble metal, a multi-site synergistic effect is realized, more active sites are exposed, and finally, the catalytic performance of the cerium oxide loaded non-noble metal catalyst for catalyzing methanation of carbon dioxide at low temperature is improved.

The invention provides an aluminum-doped NiCoCe catalyst, a preparation method thereof and application of the aluminum-doped NiCoCe catalyst in low-temperature CO2 hydrogenation methane preparation reaction, the preparation method comprises the following steps: (1) dissolving nickel nitrate, cobalt nitrate, cerium nitrate, aluminum nitrate and an alkaline precipitator in deionized water, and fully stirring the solution at room temperature to obtain a solution A; (2) putting the solution A into a reaction kettle, and crystallizing the mother liquid at a constant temperature for a certain time to obtain a solid-liquid mixture B; (3) centrifuging and washing the solid-liquid mixture B in the step (2) to obtain a precipitate C; (4) drying the precipitate C in the step (3) to obtain a precursor D; and (5) reducing and passivating the precursor D in the step (4) to obtain the catalyst. The catalyst prepared by the invention effectively solves the problem of low CO2 conversion rate in low-temperature CO2 methanation reaction, lattice distortion is promoted by introducing the Al element, the migration ability of lattice oxygen is increased, and the formation of a large number of oxygen vacancies is beneficial to improving the oxidation-reduction property of the catalyst.

The invention relates to the technical field of organic solid waste treatment, in particular to a process system for hydrogen production and co-production of biological natural gas from biological crude synthesis gas, which comprises a purification unit, a hydrocarbon regulation unit, an acid removal unit, a methane upgrading unit, a hydrogen recycling and purifying unit and a methane recycling and purifying unit which are connected in sequence. The purification unit is used for removing impurities through pre-impurity removal, compression, dry-process impurity removal and wet-process desulfurization to produce purified synthesis gas and sulfur; the hydrocarbon adjusting unit is pressurized through a centrifugal compressor and adjusts the hydrogen-carbon ratio; the acid removal unit is used for removing acid gas and organic sulfur; the methane upgrading unit is used for converting CO / CO2 into methane through methanation reaction; and the recycling unit purifies hydrogen through pressure swing adsorption and recycles methane by using a membrane separation technology to produce biogas. The problems of low purity and insufficient raw material utilization rate of the traditional process are solved through the circulation process, the co-production of high-purity hydrogen and biogas is realized, and the additional value of resources is improved.

The invention discloses a reverse shift catalyst capable of inhibiting methanation side reaction under the process condition of higher pressure and a preparation method of the reverse shift catalyst, the catalyst comprises the following effective component: iron accounting for 40-80% (weight percentage) of the total amount of the catalyst in terms of Fe2O3, an auxiliary agent for inhibiting methanation side reaction is added, and the preparation method of the catalyst is a mixing and kneading method. According to the present invention, the auxiliary agent for inhibiting the methanation side reaction is added under the reverse transformation process condition, such that the methane generation amount of the catalyst under the reverse transformation high pressure process condition is significantly reduced, the selectivity of the CO2 reverse transformation reaction is improved, the hydrogen consumption is reduced, and the new requirement of the national green dual-carbon development is met.

To provide a methanation system which has good efficiency of conversion of carbon dioxide to methane even when gas containing a low concentration of carbon dioxide is used as a carbon dioxide source, and which enables simplification of equipment and reduction of installation area thereof.SOLUTION: Methanation equipment is provided, comprising: a dissolution tank exposing carbon dioxide-containing gas to an aqueous phase, thereby producing carbon dioxide-containing solution; a culture tank for culturing methane in culture solution, thereby producing methane; a carbon dioxide gas supply flow passage for introducing carbon dioxide-containing gas into the dissolution tank; solution transfer means transferring the carbon dioxide-containing solution produced in the dissolution tank from the dissolution tank to the culture tank; a hydrogen supply flow passage for supplying hydrogen to the dissolution tank or the culture tank; and a methane discharge flow passage for discharging the produced methane from the culture tank.SELECTED DRAWING: Figure 1

Provided is a methanation device for removing a saturated hydrocarbon from a raw material gas containing methane and a saturated hydrocarbon through methanation, in which a saturated hydrocarbon having at least two carbon atoms reacts with hydrogen and the saturated hydrocarbon is converted into methane. The methanation device comprises: at least two catalyst layers composed of a catalyst for methanation, the catalyst layers being provided at intervals in the flow direction of a mixed gas containing a raw material gas and a hydrogen-containing gas; a hydrogen supply line for supplying a hydrogen-containing gas to an upstream side of the catalyst layer on the most upstream side in the flow direction of the mixed gas; a raw material gas supply line for supplying the raw material gas to each space between two catalyst layers adjacent to each other in the flow direction of the mixed gas and the upstream side of the catalyst layer on the most upstream side in the flow direction of the mixed gas; and a cooler provided between two catalyst layers adjacent to each other in the flow direction of the mixed gas and cooling the mixed gas discharged from the catalyst layer on the upstream side among the two catalyst layers adjacent to each other.

The invention belongs to the technical field of power system operation and control, and particularly provides a microgrid distributed robust optimization scheduling method considering source load uncertainty and electricity-hydrogen-carbon coupling. Comprising the following steps: constructing an electricity-hydrogen-carbon-heat four-dimensional collaborative micro-grid energy flow framework comprising a multi-port alternating current and direct current bus, a hydrogen production storage and transportation subsystem, a carbon capture methanation subsystem and a cross-stage thermodynamic energy cascade network; establishing an IGDT-based source-load bilateral uncertainty dynamic pricing model, and selecting a risk avoidance or opportunity seeking pricing model as required; a multi-agent game double-layer interaction model with a micro-grid operator as a leader and a load aggregator and a charging station as followers is constructed, and a nested part can observe a Markov decision process; and a privacy protection multi-agent deep reinforcement learning algorithm in which a maximum entropy framework and a CTDE mechanism are introduced is adopted for solving. According to the method, the problem of low-carbon operation of the micro-grid in a source load uncertainty environment is solved, and collaborative improvement of economical efficiency, low-carbon performance and robustness is realized.

The invention provides a composite catalyst for hydrogen production by steam reforming of light components of bio-oil as well as a preparation method and application of the composite catalyst. According to the invention, the chemical properties are optimized by regulating and controlling the adding proportion of the metal ions, so that the optimal interaction between the composite spinel and the auxiliary metal is obtained. The formation of the composite spinel oxide enriches the oxide species of the assistant metal and the number of oxygen vacancies on the surface of the catalyst, due to the appearance of a large number of assistant metal species, coke is quickly gasified through dissociation of water, and the gasified reducing gas is beneficial to self-reduction of the assistant metal, so that the catalytic activity of the catalyst is improved. According to the present invention, the efficient conversion and the lasting stability of the catalyst are achieved, the same good catalysis effect on the bio-oil light component is provided, and the problems of easy carbon deposition, easy deactivation, gas methanation and the like of the catalyst during the steam reforming are substantially alleviated.

System (100) for capturing and transforming carbon dioxide, comprising at least one reactor (10) having a cavity (11) in which is housed at least one compartment (12) comprising: a carbon dioxide capture block (13), said capture block comprising a capture charge capable of capturing and releasing carbon dioxide, and a catalyst block (14) comprising a catalyst capable of catalyzing a chemical methanation reaction between the carbon dioxide released by the capture block and dihydrogen; said at least one reactor having at least one gas inlet (20) in said cavity, and at least one gas outlet (30) from this cavity; said system further comprising at least one heating device (40) configured to heat said at least one reactor, and / or the cavity, and / or said at least one compartment. Figure for abstract: Figure 1

To provide: a methane production device and a methane production method which, in production of methane gas by bio-methanation, enable supply of the methane gas at a proper concentration required on a use place where the methane gas is used; and a power generation system utilizing the methane production device.SOLUTION: A methane production method according to the present invention, which is for performing methane production based on bio-methanation, includes: a reaction step of performing a methanation reaction with hydrogen gas and biogas being supplied; and a control step of controlling the efficiency of the methanation reaction to obtain methane gas having any methane concentration. According to the methane production method, the methane gas can be supplied at a proper concentration adapted to a use place of the methane gas. A power generation system according to the present invention utilizes the methane gas obtained from a methane production device according to the present invention. The power generation system enables the methane production device to have a high efficiency without replacing an existing gas power generator.SELECTED DRAWING: Figure 1

To provide a methanation apparatus capable of suppressing deterioration of a catalyst for methanation, a methanation method, a direct decomposition apparatus of hydrocarbons, and a direct decomposition method of hydrocarbons.SOLUTION: A methanation apparatus for removing saturated hydrocarbons from a raw material gas by methanation where saturated hydrocarbons having two or more carbon atoms and hydrogen react to convert the saturated hydrocarbons into methane includes at least two catalyst layers 11a, 11b arranged with gaps in between and being catalyst layers for methanation, a hydrogen supply line 3 to provide a hydrogen-containing gas upstream of the most upstream catalyst layer in a circulation direction of a mixed gas, and a raw material gas supply line 4 to supply the raw material gas between an upstream side than the most upstream side catalyst layer and adjacent two catalyst layers, and a cooler 13 that is situated between two adjacent catalyst layers and cools the mixed gas flowing out from the upstream catalyst layer in a circulation direction of the mixed gas among the two adjacent catalyst layers.SELECTED DRAWING: Figure 1

The invention relates to the technical field of catalysts, in particular to a composite catalyst for methanation of carbon dioxide and a simple preparation method thereof.The composite catalyst is prepared from active metal Ni salt, rare earth metal Ce salt, metal additive Mg salt and metal precursor Al salt through the key steps of mixing, grinding, calcining and the like. The preparation process is simple, the operation is convenient, and the production difficulty and cost are greatly reduced; the process is energy-saving and environment-friendly, no waste liquid is generated in the whole process, the problem of environmental pollution of a traditional process is avoided, safety, high efficiency, greenness and no pollution are realized, and the preparation method meets the requirements of large-scale industrial production; when the prepared composite catalyst is applied to a carbon dioxide methanation reaction, the performance is excellent, the catalyst can show high catalytic activity under a low-temperature condition, and the reaction efficiency is remarkably improved; meanwhile, the selectivity to methane is extremely high, generation of by-products can be effectively reduced, and the application prospect is good.

The invention relates to a method for producing methane through biomass hydrogasification. The method comprises the following steps: S1, the water electrolysis hydrogen production device produces hydrogen and oxygen; s2, fully mixing the biomass particles with steam in a biomass hydrogenation bubbling fluidized bed reactor, and hydrogen and oxygen from a water electrolysis hydrogen production unit for reaction to generate crude synthesis gas rich in methane; s3, cooling the crude synthesis gas rich in methane in a waste heat recovery unit and producing cooled crude synthesis gas and steam; s4, removing fly ash and part of impurities from the cooled crude synthesis gas in a dust removal washing unit to obtain washed crude synthesis gas; s5, converting the washed crude synthesis gas in a carbon monoxide conversion unit to obtain converted synthesis gas; s6, removing carbon dioxide and other impurities from the converted synthesis gas in a synthesis gas purification unit to obtain purified synthesis gas; s7, separating 0-55vol% of the purified synthesis gas in a gas separation unit to generate carbon-rich gas and hydrogen-rich gas; and S8, generating methane from the residual purified synthesis gas in a methanation unit.

The invention discloses an electric methane preparation catalyst compounded by Ni nanoclusters and ZrO2 with lattice embedded with Ru single atoms as well as a preparation method and application of the electric methane preparation catalyst. The electric methane preparation catalyst comprises a NiNCRuSA / ZrO2 bimetallic active site catalyst compounded by the Ni nanoclusters and the ZrO2 with the lattice embedded with the Ru single atoms. The electric methane preparation catalyst comprises a NiNCRuSA / ZrO2 bimetallic active site catalyst, the NiNCRuSA / ZrO2 bimetallic active site catalyst is of a ZrO2 composite structure formed by embedding Ru monatomic into Ni nanoclusters and crystal lattices, the Ni nanoclusters and the Ru monatomic are adjacently distributed on a ZrO carrier to form a synergistic catalysis structure, rich and efficient active sites are provided for catalytic reaction, and reactant adsorption and conversion are facilitated; in the subsequent CO2 methanation reaction, the Ni element quickly dissociates H2 and provides sufficient H *, Ru replaces ZrO2 to serve as an active site for CO2 adsorption and conversion, conversion of an intermediate of CO2 can be accelerated, the reaction activity is greatly enhanced through cooperation of the Ni element and the Ru, the reaction energy barrier is reduced, and the overall catalytic efficiency is improved.

The invention discloses a preparation method of a nickel-based reverse catalyst with an oxide layer coating structure and photo-thermal methanation application, the catalyst takes metal Ni for dissociating hydrogen as a carrier, a low-dimensional nano metal M oxide coating structure is loaded on the surface of the carrier to construct an M / Ni reverse catalyst, the metal M is one or two of Ce, Zr, Al, Ti, Zn and Mg, and the metal M is one or two of Ce, Zr, Al, Ti, Zn and Mg. And the molar fraction of the load phase metal M is 5-40% based on 100% of the molar fraction of all metals in the catalyst. Through a simple coprecipitation method, a continuous nickel metal phase with hydrogen dissociation capacity is prepared to serve as a carrier, a low-dimensional nano oxide is loaded to construct a reverse catalyst, an oxide layer coating structure is constructed on the surface of the catalyst, and the oxide layer coating structure and the loaded nano oxide form a heterojunction. The catalyst disclosed by the invention shows excellent photo-thermal catalytic performance under mild illumination of 0.7 W.cm <-2 > without an external heat source, the surface heterostructure of the catalyst enhances the photo-response capability under a low-light-intensity condition, and an efficient photo-thermal synergistic effect is realized.

A pyrolysis gas conveying system comprising a coupled carbon capture assembly. The pyrolysis gas conveying system comprises: a pyrolysis gas purification assembly (1) used for purifying a pyrolysis gas, a carbon capture assembly (2) used for capturing carbon dioxide in the passing air, a methanation reaction assembly (3) used for receiving the purified pyrolysis gas and carbon dioxide to undergo a methanation reaction for increasing a methane proportion in the pyrolysis gas, and a follow-up flow mixing and transport assembly (4) connected to the methanation reaction assembly (3) and used for removing carbon dioxide from a reaction gas generated by the methanation reaction and mixing the reaction gas with natural gas in a specified ratio to meet the requirements of different user terminals. A pyrolysis gas conveying method comprising a coupled carbon capture assembly uses the pyrolysis gas conveying system comprising the coupled carbon capture assembly. By means of such arrangement, the carbon dioxide captured by the carbon capture assembly is used as a methanation carbon source, and the pyrolysis gas undergoes the methanation reaction by means of a supplementary carbon source, thereby increasing the methane proportion, and reducing a hydrogen proportion, the natural gas is supplemented by means of the follow-up flow mixing and transport assembly on the basis of the requirements of the user terminals to adjust a hydrogen doping proportion, and the gas is conveyed to different user terminals by means of a natural gas pipeline.

The invention belongs to the technical field of catalysts, and relates to a cerium oxide supported nickel catalyst and a preparation method and application thereof, and the catalyst is composed of a metal nickel active component and a cerium oxide carrier. The cerium oxide prepared by adopting a reversed-phase microemulsion method is dispersed in a nano-scale manner, has a large specific surface area and abundant oxygen vacancies on the surface, can realize high dispersion of metal nickel after loading nickel on the cerium oxide, has relatively high stability, and is beneficial to realizing efficient methanation of carbon dioxide hydrogenation. By changing the preparation conditions of the reversed-phase microemulsion, the number of oxygen vacancies on the surface of the catalyst can be effectively adjusted, and the CO2 hydrogenation reaction performance of the catalyst is regulated and controlled. The cerium oxide supported nickel catalyst prepared by the invention has the CO2 conversion rate of 83% and the CH4 selectivity of 97%, and shows excellent CO2 conversion rate and methane selectivity, which indicates that the cerium oxide-containing catalyst provided by the invention has excellent CO2 hydrogenation performance, shows excellent catalytic activity, product selectivity and stability, and can be used for preparing a catalyst for hydrogenation of CO2. And large-scale industrial application can be realized.

The invention provides a preparation method and application of a reversed-phase nickel-based bimetallic catalyst, the reversed-phase nickel-based bimetallic catalyst is prepared by a sol-gel method, the catalyst comprises active metals Ni and M (M = Fe, Co and Ru) and a metal carrier N oxide (N = Ce, Zr, Al and La), the mass percentage of the active metals Ni and M is 50-95 wt%, and the mass percentage of the metal carrier N oxide is 5-50 wt%. The specific surface area of the catalyst is 10-800 m < 2 > / g, the pore volume is 0.01-9.80 cm < 3 > / g, and the pore diameter is 0.1-20.0 nm. The active metal and the metal carrier oxide are uniformly dispersed and have strong interaction. The provided sol-gel method can reduce the aggregation process to the greatest extent, generate smaller metal particles and expose more metal oxide interfaces. The problems that in the prior art, in preparation of the NxOy / NiaMb nickel-based bimetallic reverse-phase catalyst, the catalyst is prone to aggregation, and the process is complex are solved. The preparation method of the reverse catalyst can be applied to low-temperature methanation of carbon dioxide.

The invention relates to the technical field of optimized operation of a comprehensive energy system, and discloses a P2G two-stage modeling gas-electricity-hydrogen coupling distribution network distribution robust low-carbon operation method. The method comprises the following steps: establishing a P2G refinement model in consideration of two-stage processes of water electrolysis hydrogen production and hydrogen methanation, constructing a target function which takes the minimum operation cost of a gas-electricity-hydrogen coupling distribution network system as a target function, and converting a low-carbon operation optimization model into a mixed integer second-order cone programming model for solving; uncertain scenes of wind power output and load fluctuation are obtained, an uncertain parameter distribution probability fuzzy set is constructed based on KL divergence, and a gas-electricity-hydrogen coupling distribution network distribution robust low-carbon operation model considering source load uncertainty is established; according to the method, the flexibility and the environmental protection property of system scheduling can be improved, and the optimal operation decision for balancing the economical efficiency and the safety is obtained on the premise of guaranteeing the safe operation of the system.

The invention relates to a non-sulfur-tolerant wide-temperature shift regulation and control process based on a coal natural gas methanation process, and belongs to the technical field of coal chemical industry. The process comprises the following specific steps: carrying out non-sulfur-tolerant wide-temperature shift reaction on purified raw materials for methanation reaction, namely carrying out adiabatic and / or isothermal CO shift reaction under the conditions that the temperature is 200-360 DEG C, the pressure is 1-10 MPa, the molar ratio of H2O to CO is 0.7-2 and the air speed is 3000-40000h <-1 >, reducing the CO concentration at the inlet of a methanation reactor by 30-70%, and then carrying out high-temperature reaction on the methanation reaction to obtain the high-sulfur-tolerant methanation reaction. The CO disproportionation reaction in the methanation reactor is avoided while the circulating gas is effectively reduced, the service life of the existing methanation catalyst is prolonged by more than 50%, and the shutdown frequency and the maintenance time are greatly reduced.

Disclosed in the present invention is a zero carbon emission offshore liquefied natural gas production system device. The zero carbon emission offshore liquefied natural gas production system device comprises an offshore liquefied natural gas separation device, a water-electrolytic hydrogen production device, and a CO2 methanation device, wherein the offshore liquefied natural gas separation device comprises an offshore liquefied natural gas storage tank, a first raw material delivery pump, a first condenser, a first cryogenic rectification apparatus, a second raw material delivery pump, a second condenser, a second cryogenic rectification apparatus, a natural gas condensation and drying apparatus, and a natural gas pressurization and liquefaction apparatus; the water-electrolytic hydrogen production device comprises a water storage tank, a water delivery pump, a clean energy power generation apparatus, a water-electrolytic hydrogen production apparatus, and a hydrogen delivery apparatus; and the CO2 methanation device comprises a gas mixer, a heat exchanger, a multistage heat-transfer high-gravity reactor, and a third condenser. Using the multistage heat-transfer high-gravity reactor, the present invention can, on the one hand, solve the problem of heat transfer of the high-gravity device during the highly exothermic reaction, and on the other hand, can effectively reduce carbon deposition on the surface of the catalyst.

The invention provides a low-carbon hydrogen production system coupling renewable energy sources and fuel reforming. The low-carbon hydrogen production system comprises a power generation system, a hydrogen production system, a hydrogenation system and a waste heat utilization system, the waste heat utilization system comprises a waste heat utilization evaporator, a turbine, a condenser, a working medium pump and a lithium battery. The waste heat utilization evaporator is provided with a first inlet, a second inlet, a first outlet and a second outlet. When the waste heat utilization system works, a liquid working medium is pressurized by a working medium pump to form a high-pressure liquid working medium, the high-pressure liquid working medium enters a second inlet of the waste heat utilization evaporator and is evaporated into high-temperature and high-pressure working medium gas after exchanging heat with high-temperature hydrogen provided by a hydrogenation system; high-temperature and high-pressure working medium gas flows out of the second outlet and enters the turbine to drive the turbine to rotate to supply power to the lithium battery; the gas after acting releases heat and is liquefied by the condenser, and then is pressurized and conveyed to the waste heat utilization evaporator by the working medium pump; according to the invention, based on the combination of methane methanol hydrogen production, photovoltaic power generation hydrogen production, methanation and carbon capture technologies, high-efficiency utilization and low-carbon emission of energy can be realized.

The invention discloses a stable high-valence ruthenium photo-thermal catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysis. The preparation method comprises the following steps: dispersing titanate with a tunnel structure into a RuCl3 solution, stirring, filtering and washing to obtain Ru3 + embedded titanate; and placing the Ru < 3 + > embedded titanate in a closed environment containing H2 and CO2 gas for photo-thermal activation to obtain titanate-loaded ruthenium acid salt, namely the stable high-valence ruthenium photo-thermal catalyst. Titanate with a tunnel structure is used as a carrier, a Ru delta + site is constructed, the Ru delta + site is easily reduced in the photothermal catalysis CO2 methanation process, the layered titanate is used for anchoring the Ru delta + catalytic site, and the coordination effect of alkali metal is combined, so that the photothermal catalysis stability and activity of Ru delta + are remarkably improved; the problem that the catalytic site of an existing photo-thermal catalyst is unstable is solved. And the yield of methane and the conversion rate of CO2 in CO2 methanation are greatly improved.