75 results about "Methanation" patented technology

The application discloses a reverse cone type fluidized bed reactor for CO2 methanation, which comprises a shell and catalyst particles, the bottom of the shell is provided with a first gas inlet, the first gas inlet is used for feeding a first gas into the shell, the first gas is a mixed gas of CO2 and hydrogen, the top of the shell is provided with a gas outlet, the shell defines a reaction cavity, the reaction cavity comprises a conical cavity, the cross-sectional area of the conical cavity gradually increases in the upward direction, and the cross section of the conical cavity is perpendicular to the upward direction; the catalyst particles are arranged in the reaction cavity, and at least part of the catalyst particles are located in the conical cavity. According to the reverse cone type fluidized bed reactor for CO2 methanation, local heat accumulation caused by a large amount of heat release due to a fast reaction rate in the initial stage of the reaction can be avoided, heat is uniformly distributed in the conical cavity, local overheating is avoided, catalyst activity stability is ensured, the size of bubbles formed by impact flow of gas in the catalyst particles is reduced, and the methane conversion rate is improved.

A methanization device is provided for removing a saturated hydrocarbon from a feed gas containing methane and a saturated hydrocarbon by methanation, wherein a saturated hydrocarbon with at least two carbon atoms reacts with hydrogen and the saturated hydrocarbon is converted into methane. The methanization device comprises: at least two catalyst layers, each consisting of a catalyst for methanation, wherein the catalyst layers are arranged at intervals in the direction of flow of a mixed gas containing a feed gas and a hydrogen-containing gas; a hydrogen supply line for supplying a hydrogen-containing gas to the upstream side of the catalyst layer on the side furthest upstream in the direction of flow of the mixed gas;a feed line for supplying the feed gas to each space between two catalyst layers that are adjacent to each other in the direction of flow of the mixed gas, and to the upstream side of the catalyst layer on the side furthest upstream in the direction of flow of the mixed gas; and a cooler arranged between two adjacent catalyst layers in the direction of flow of the mixed gas, which cools the mixed gas exiting the catalyst layer on the upstream side of the two adjacent catalyst layers.

This invention belongs to the technical field of CO2 capture and resource utilization in coal-fired power plants, and relates to a CO2 capture-methanation system and method based on catalyst-coupled waste heat. It includes: a CO2 capture unit, comprising a fixed-bed adsorption tower and an adsorbent regeneration device, the fixed-bed adsorption tower being connected to the adsorbent regeneration device; a catalytic methanation unit, comprising a fixed-bed reactor, the fixed-bed reactor being connected to the adsorbent regeneration device; a waste heat utilization unit, comprising a heat exchanger and a heat transfer oil circulation system, the cold-side outlet of the heat exchanger being connected to the heat transfer oil circulation system, the heat transfer oil circulation system being connected to both the adsorbent regeneration device and the fixed-bed reactor; and a solid waste backfilling unit, comprising a mineralization reaction tank, the mineralization reaction tank being connected to the fixed-bed reactor and the adsorbent regeneration device. This invention achieves synergy between CO2 capture, conversion, waste heat utilization, and solid waste backfilling, improving the system's economic and environmental benefits.

The invention relates to a process for converting CO2 into methane, wherein hydrogen is contacted with a gaseous feed comprising CO2 in at least one methanation reactor comprising a catalyst bed at a catalyst bed temperature of 160°C to 550°C at a pressure of 0.1 MPa to 1 MPa, wherein the gas hourly space velocity is 10 m 3 / kg / hour to 50 m 3 / kg / hour, and wherein the H2 / CO2 molar ratio is 1 to 8, and wherein the catalyst comprises Ni metal deposited on a substrate made of uranium oxide having the formula UO 2+x , wherein x is 0.01 to 0.6, and wherein the mass content of nickel is 5% to 40% of nickel metal relative to the total mass of the catalyst.

The application relates to a ligand-regulated CuCe-MOF catalyst and a preparation method and application thereof in an electrocatalytic CO2 methane production reaction, and the preparation method comprises the following steps: mixing a Ce solution, an organic ligand solution and a structure directing agent to obtain a mixed solution; the organic ligand is terephthalic acid, 1,4-naphthalene dicarboxylic acid, diphenyl dicarboxylic acid or triphenyl dicarboxylic acid; the mixed solution is centrifuged and dried to obtain a cerium-based metal organic framework powder; the cerium-based metal organic framework powder is dispersed in a third solvent, ultrasonated, and soluble Cu salt is added, and after stirring, the third solvent is volatilized by heating to obtain the CuCe-MOF catalyst. The CuCe-MOF is prepared by using the organic ligand with a single benzene ring, a double benzene ring and a triple benzene ring, the dual synergistic optimization of ligand electronic effect and protonation efficiency is realized, the methane selectivity is greatly improved in the CO2 electro-reduction, and a brand-new synergistic regulation strategy is provided for the structural design and performance optimization of a CO2 RR electro-catalyst.

This invention relates to the field of carbon dioxide methanation catalysis technology, and discloses a low-temperature carbon dioxide methanation catalyst, its preparation method, and its applications. The catalyst comprises an active component, a support, and an auxiliary agent; the active component is at least one selected from nickel, ruthenium, and rhodium; the support is nitrogen-doped carbon nanotubes; and the auxiliary agent includes at least one selected from transition metal elements and / or rare earth metal elements. The methanation catalyst of this invention exhibits excellent methanation catalytic activity at low temperatures and good stability at high temperatures, producing highly selective methane. The catalyst preparation method is simple and has promising prospects for industrial application.

The application relates to the technical field of carbon dioxide conversion, and discloses a carbon dioxide methanation reaction device and method.The device comprises a reactor shell (1), the middle part of the reactor shell (1) is provided with a carbon dioxide feeding port (2), the two ends are respectively provided with a first product outlet (3) and a second product outlet (4), in the reactor shell (1), a first reaction zone (5) is formed between the carbon dioxide feeding port (2) and the first product outlet (3), and a second reaction zone (6) is formed between the carbon dioxide feeding port (2) and the second product outlet (4). Through the carbon dioxide methanation reaction device and method, the catalytic efficiency and hydrogen utilization rate can be effectively improved, the reaction catalyst deactivation rate and the catalytic reaction temperature can be reduced, and the energy-saving and emission-reducing target can be achieved.

This invention discloses a two-stage plasma-catalyzed carbon dioxide methanation reactor in the field of plasma catalysis, comprising: a reactor, which is a cylindrical reactor with a closed top and bottom, divided into an inner reaction chamber and an outer reaction chamber by an insulating cylinder; the inner reaction chamber and the outer reaction chamber are respectively provided with an inlet and an outlet at their tops; an electrode assembly, including a high-voltage electrode and a grounding electrode, respectively disposed in the inner reaction chamber and the outer reaction chamber, both of which are electrically connected to a high-voltage power supply; a dehydration structure, disposed at the bottom of the reactor and connected to both the inner and outer reaction chambers; and a catalyst, including a first catalyst and a second catalyst. The beneficial effects of this invention are: by setting up two reaction chambers and setting up a dehydration device between the two reaction chambers, the thermodynamic equilibrium is shifted in a direction favorable to methanation, and the second reaction chamber utilizes the heat from the first reaction chamber, thus saving more energy.

The embodiment of the present application provides a method for hydrogen-carbon co-conversion and carbon sequestration in a geological body and an operation system thereof. The method comprises the following steps: injecting water, carbon dioxide and a catalyst into the geological body, carrying out hydrogen production, carbon dioxide mineralization and in-situ methanation, and obtaining methane. The catalyst comprises at least one of nickel, iron, cobalt and molybdenum or an oxide thereof; and the geological body comprises silicate minerals. The method is used to realize the integrated operation of long-term stable sequestration of carbon dioxide and energy conversion process, so as to improve the comprehensive energy utilization efficiency of the geological sequestration system.

This invention discloses a system and method for producing carbon materials and co-producing natural gas through pyrolysis and gasification in an oxygen-enriched rotary kiln. The system uses raw coal as raw material, which is pretreated and dried before being fed into an oxygen-enriched rotary unit. Within the unit, oxygen-enriched gas and steam are precisely and segmented to achieve continuous and synergistic conversion of pyrolysis, activation, and gasification. The continuous rotation of the rotary kiln ensures uniform material mixing and efficient heat and mass transfer. The system simultaneously produces two high-value products: crude coal gas rich in H2 and CO undergoes conversion, green hydrogen coupling, purification, and methanation to produce synthetic natural gas or liquefied natural gas; while the fully activated solid carbon material is cooled and screened to obtain high-quality carbon materials. Furthermore, the waste heat from the oxygen-enriched combustion in the rotary kiln is used to generate steam in a waste heat boiler to meet the preheating requirements of raw coal drying and methanation reactions. The exothermic reaction from methanation is recovered through a heat exchanger and used to heat the raw gas, significantly reducing external energy consumption.

The application aims to provide a Ni-Ga based catalyst, a preparation method and application thereof, and belongs to the technical field of catalysts.The Ni-Ga based catalyst has a Ni-Ga alloy as an active phase and CeO2 as a carrier; the total content of the metal Ni-Ga accounts for 3-20 wt% of the weight of the catalyst. The catalyst preparation process comprises the following steps: a mixed solution of nickel and gallium metal salts is impregnated into the CeO2 carrier, rotary evaporation, drying and heat reduction treatment are carried out at a certain temperature to obtain the Ni-Ga / CeO2 catalyst. The Ni-Ga alloy phase effectively inhibits the occurrence of the methanation side reaction due to the unique surface properties, and exhibits excellent catalytic activity, CO selectivity and catalyst stability. The catalyst preparation method is simple, any noble metal is not used in the synthesis process, the production cost is low, and the industrial application is easy.

The application discloses an extrusion molding preparation method of a NiAl monolithic catalyst and application of the NiAl monolithic catalyst in CO methanation reaction and belongs to the technical field of industrial catalysis and energy chemical industry. First, a sodium metaaluminate solution is reacted with a nickel nitrate solution by adopting a coprecipitation method, and a nickel-aluminum composite oxide powder is prepared through water bath evaporation and calcination. Then, the powder is dry-mixed with a binder, a plasticizer and a pore-forming agent, kneaded into a mud by adding a dilute nitric acid solution, and extrusion-molded into a green body after aging and mud refining. The green body is sequentially subjected to freeze drying, step-by-step heat drying and calcination, so that the NiAl monolithic catalyst is prepared. The monolithic catalyst prepared by combining the extrusion molding with the multi-stage drying and calcination process has good mechanical strength and regular structure. The obtained catalyst has high activity and CH4 selectivity in the CO methanation reaction and has a wide application prospect in the field of energy chemical industry.

The application discloses a preparation method of CaO-based bifunctional material, the CaO-based bifunctional material and application thereof. The preparation method comprises the following steps: adopting impregnation, hydrothermal synthesis or sol-gel method, blending or reacting carbon capture metal precursors, catalyst metal precursors, auxiliary metal precursors, xylose, glycine and urea to form a mixture; and then calcining the mixture in air at 400-900 DEG C for 2-6 hours to obtain the CaO-based bifunctional material. The application has the advantages of high CO2 adsorption capacity and fast conversion rate, and can basically keep the capture time, so that efficient and convenient ICCU-methanation is realized.

A catalytic methanation reactor comprising a header 100, a plurality of fluid flow channels 106 extending downstream from a first support member 110 residing in the header volume with the channel inle

The present application discloses a kind of high-pressure sulfur-tolerant shift catalyst additive complex, catalyst and preparation method, specifically discloses a kind of under the conditions of high-pressure pulverized coal gasification low water-gas ratio sulfur-tolerant process shift, inhibit methanation reaction additive complex, and the catalyst of adding the additive complex.Inhibit methanation reaction additive includes one or more of Mn, Zr, Cu, Fe and Cr oxide, nitrate, sulfate or carbonate, the prepared catalyst has excellent CO conversion activity in addition, also has excellent anti-methanation side reaction function.Suitable for high-pressure pulverized coal gasification high CO content low water-gas ratio process condition CO sulfur-tolerant conversion device, under high pressure and low water / gas conditions, can inhibit methanation side reaction, make methane generation amount significantly reduce, prevent shift furnace because of methanation side reaction and "fly temperature", stabilize shift operation, meet the needs of coal chemical industry high-pressure pulverized coal gasification new process development.

Disclosed is a catalytic methanation tubular reactor including a distribution member and one or more associated flow guides, which are collectively usable to produce a uniform feed gas flow distribution at inlet ends of an array of flow channels that at least partially extend through a shell of the catalytic methanation tubular reactor. The distribution member and the one or more flow guides can be positioned in a header volume between a header inlet and the inlet ends of the flow channels, with the one or more flow guides subjacent to the distribution member. A plurality of distribution openings may extend through the distribution member. The one or more flow guides may bound the distribution openings. By controlling the size and distribution of the distribution openings and using the flow guides, a feed gas flow can be uniformly distributed across the inlet end array of the catalytic methanation tubular reactor.

The utility model relates to hydrogen energy carbon reduction technology field, and disclose a kind of coal-fired power plant oxygen-enriched combustion low carbonization system based on hydrogen energy, the system includes: combustion power generating unit and electrolytic water unit, the electrolytic water unit is used to deliver oxygen to coal-fired power plant;The system further includes: carbon dioxide capture unit, heat exchange unit, methanation unit, methane cracking unit and renewable energy power generating unit, the carbon dioxide capture unit is used to capture carbon dioxide in combustion power generating unit tail gas, the methanation unit is used to carry out methanation reaction to generate methane and water with carbon dioxide and hydrogen, the methane cracking unit is used to generate green graphite or carbon black such as carbon element and hydrogen with methane cracking reaction, and the renewable energy power generating unit is used to deliver renewable energy power generating unit's electric power to system.The utility model solves the problem of carbon dioxide capture and processing of combustion tail gas, realizes carbon element resource utilization, oxygen element recycling effect.

This invention discloses a method for preparing a metal-modified NiAl catalyst and its application in the CO methanation reaction, belonging to the field of chemical catalysis technology. The method employs a complexation-assisted sol-gel method, mixing one of a rare earth metal complex solution and a transition metal complex solution with a soluble nickel salt solution and a soluble aluminum salt solution. The mixture is then concentrated by evaporation in a water bath to form a sol, followed by drying and calcination in air to obtain the metal-modified NiAl catalyst. The metal-modified NiAl catalyst prepared by this invention possesses a nanocomposite structure, high specific surface area, and suitable pore characteristics, exhibiting high CO conversion and CH4 selectivity in the CO methanation reaction. This catalyst is suitable for the selective methanation of CO in coke oven gas and for synthetic natural gas production systems, enabling efficient CO conversion and resource utilization.

Nutrients are supplied to methanogenic bacteria supported on a carrier using a simple configuration. [Solution] The methane production apparatus 10 comprises a methane fermentation tank 12 having a methane fermentation liquid containing organic matter and methane-producing bacteria; a gas holder 14 provided above the methane fermentation tank 12, which stores the biogas produced in the methane fermentation tank 12 and has a top plate 14B and an arm 40 that moves up and down according to the amount of biogas stored; a methanation unit 20 attached to the arm 40, which moves between above and below the liquid surface S of the methane fermentation liquid in conjunction with the up and down movement of the top plate 14B and the arm 40 and has a carrier that supports methane-producing bacteria; and a hydrogen supply unit 16 that supplies hydrogen to the methane fermentation tank 12.

This invention discloses a carbon dioxide methanation system and method, employing a core architecture of a single-stage adiabatic methanation reactor connected in series with a two-stage temperature-controlled methanation reactor. Carbon dioxide gas is distributed in a specific ratio and introduced into the inlet of each reactor. Hydrogen is mixed with the first batch of carbon dioxide and then enters the adiabatic reactor for a high-temperature reaction. The high-temperature gas exiting the reactor is dedicated to superheating the saturated steam produced as a byproduct of the subsequent temperature-controlled reactor. The mixed reaction gas is then mixed with the second and third batches of carbon dioxide and sequentially enters the two-stage temperature-controlled reactor for a deep methanation reaction. The heat of reaction is removed by a steam drum system via water circulation, producing steam as a byproduct. This invention, through optimized combination of reactor types, segmented injection of feed gas, and directional, stepped utilization of heat, achieves efficient conversion of carbon dioxide into methane product gas without a recirculating gas compressor. It offers advantages such as a short process, low energy consumption, flexible operation, and the production of high-quality steam as a byproduct.

The application discloses a catalyst for CO2 methanation reaction and a preparation method and application thereof, and belongs to the technical field of CO2 methanation reaction. On the basis of nickel-aluminum layered double hydroxide, basic metal beneficial to CO2 conversion and basic metal beneficial to CO2 adsorption are simultaneously doped into the nickel-aluminum layered double hydroxide, and are in-situ grown on a carrier with a large specific surface area and a CO2 adsorption effect. After calcination and reduction, the catalyst for CO2 methanation reaction is obtained. On the basis of the nickel-aluminum layered double hydroxide, the basic metal additive and the carrier are compounded, the adsorption and in-situ conversion efficiency of CO2 are enhanced, and the conversion rate of CO2 at low temperature and the stability of the catalyst are greatly improved.

The application belongs to the field of chemical industry and environmental protection technology, and particularly relates to a novel isothermal bed methanation reactor and a methanation process. The reactor comprises coaxially arranged inner and outer cylinders, an upper head and a lower head connected to two ends of the inner cylinder. The inner cylinder is in the shape of a circular truncated cone and is used for loading catalysts and forming a catalyst bed. The inner cylinder has an inner cylinder central passage which is communicated with a head cooling water inlet and a head steam outlet through two bent pipes respectively arranged in the upper head and the lower head. The upper head is provided with a main inlet communicated with a coke oven gas inlet main pipe, and the lower head is provided with a reactor outlet. The application realizes precise temperature control and efficient heat removal for the strong exothermic methanation reaction, completely avoids a large amount of gas circulation in the traditional circulating adiabatic fixed bed process, significantly reduces energy consumption and investment, and improves conversion rate and catalyst life.

A system for producing energy and methane includes a waste-to-energy unit configured to produce energy and a flue gas by combusting waste and an oxidizing agent having oxygen and a carbon dioxide (CO2) separation unit configured to separate CO2 from the flue gas to provide separated CO2. The system also includes a bio-methanation unit configured to generate methane (CH4), heat, and water using the separated CO2 received from the CO2 separation unit and received hydrogen (H2) gas. The system further includes an electrolyzer coupled to a source of water (H2O) and an electric power source supplying electricity and configured to split the H2O to generate the oxygen used in the oxidizing agent and the H2 gas used in the bio-methanation unit.

The present application relates to a preparation method of In-O-Rh catalyst and its application in reverse water gas shift reaction. The existing Rh-based catalyst has low CO selectivity, easy methanation side reaction and Rh species easy aggregation and deactivation in the reverse water gas shift reaction. The catalyst includes active component Rh, additive In and carrier Al2O3; Rh is highly dispersed in the form of single atom on the surface of the carrier, In and Rh form In-O-Rh interface structure, induce electron transfer from Rh to In, make Rh in electron deficient state, and inhibit the formation of Rh-Rh metal bond. The present application also provides a preparation method and application. By introducing In species, using the strong interaction between In and Rh, stabilizing Rh single atom on atomic scale and regulating its electronic structure, the high efficient and high selective conversion of CO2 to CO is realized. In the reverse water gas shift reaction, the CO selectivity of the catalyst is close to 100% in the range of 320-440 DEG C, the CO2 conversion rate is close to the thermodynamic equilibrium value, and the performance does not show obvious attenuation in continuous operation for 500 hours.

The present application provides a wind-solar-hydrogen comprehensive energy optimization method considering methanation and carbon capture, and belongs to the field of energy optimization. The method comprises the following steps: establishing a wind-solar-hydrogen comprehensive energy architecture considering carbon capture and methanation; based on the wind-solar-hydrogen comprehensive energy architecture considering carbon capture and methanation, establishing mathematical models of each energy flow conversion and storage device; based on the mathematical models of each energy flow conversion and storage device, establishing a scheduling model objective function and a capacity configuration objective function, and establishing constraint conditions of the scheduling model objective function and the capacity configuration objective function, wherein the scheduling model objective function is the minimum value of the sum of the energy purchase cost, the amount of abandoned wind and abandoned light, and the operation and maintenance cost, and the capacity configuration objective function is the minimum value of the sum of the construction cost, the operation and maintenance cost, and the carbon emission cost; and the optimal scheduling scheme and the optimal capacity configuration scheme are obtained by using a CPLEX solver. The present application provides a scheduling and capacity planning model considering system flexibility, which is innovative in model establishment and has universality.

This invention discloses a photovoltaic and biomass coupled biogas production system, preparation method, and optimized coupling method, belonging to the field of carbon dioxide methanation technology. This invention addresses the biomass-to-biogas process under fluctuating photovoltaic conditions by coupling direct methanation and decarbonization of biogas. The biogas flow rate entering the methanation process is adjusted according to the hydrogen production. Excess biogas enters a carbon separation unit for CO2 storage. Controlling the circulation rate of the biogas methanation reactor ensures a stable space velocity and meets conversion requirements. Simultaneously, the oxygen produced during hydrogen production is used for oxygen-enriched combustion of fermentation biogas residue, overcoming the poor combustion performance caused by the low calorific value and high moisture content of the residue. Furthermore, the heat released from biogas methanation is comprehensively utilized to produce steam, meeting the steam consumption requirements of the electrolytic hydrogen production and decarbonization processes, thus improving the energy efficiency of the coupled system.

Disclosed in the present invention is a zero-carbon glass kiln process. A system required by the process comprises a photovoltaic power generation device, an air separation device, a device for hydrogen production via water electrolysis, a mixer, a methanation device, a waste heat boiler I, a reforming device, a glass kiln, a waste heat boiler II, and a dust removal and desulfurization device. In the present invention, the generation of green oxygen, green nitrogen and green hydrogen is driven by green electricity; flue gas from the glass kiln is cyclically enriched into high-concentration carbon dioxide (95.0 v% or higher), which undergoes a methanation reaction with green hydrogen to generate methane, and methane, carbon dioxide and water vapor are subjected to a reforming reaction to generate carbon monoxide and hydrogen; and carbon monoxide and hydrogen are used as the fuel of the glass kiln, green oxygen and carbon dioxide are mixed to form a carbon-based oxygen-enriched mixture which is used as a combustion improver for the glass kiln to perform carbon-based oxygen-enriched combustion in the glass kiln, and redundant carbon dioxide is sold. The present invention achieves the purposes of greenness, energy conservation, almost zero nitrogen oxides and zero carbon.