97 results about "Methane decomposition" patented technology

The invention discloses a carbon dioxide hydrogenation methanation-cracking carbon preparation series method, which comprises the following steps: generating CH4 through a reaction of # imgabs0 # imgabs1 #, and realizing the production of a carbon material by adopting the technologies of condensation separation of CH4 and water vapor, CH4 cracking reaction of # imgabs2 #, cyclic utilization of hydrogen and the like. The process is composed of a carbon dioxide hydrogenation methanation reactor and a methane cracking reactor. In the methanation reactor, CO2 and H2 react under a low-temperature condition to generate CH4 and water vapor; cH4 and water vapor are separated by adopting a compressor condensation separation technology, and the separated CH4 is conveyed to a cracking reactor. In the methane cracking reactor, CH4 is cracked at a high temperature to generate H2 and a carbon nanomaterial, and then H2 is returned to the methanation reactor again. The separation of CH4 and water vapor at a relatively low temperature is realized in the tandem carbonization process through a low-temperature condensation technology; through low-temperature CO2 methanation and CH4 catalytic cracking, the content of CO2 is reduced, a high-quality carbon nanomaterial is obtained, and cyclic utilization of CO2 and H2 is realized.

The invention relates to the technical field of methane cracking and hydrogen production, and discloses a metal-modified Co-Bi liquid alloy catalyst, wherein the catalyst uses Co as an active component, uses Bi low melting point metal as a solvent, and uses a third metal M as an auxiliary agent; the invention also discloses a method for preparing the catalyst, comprising: calcining a cobalt salt to generate cobalt oxide, and then forming CoO-MO X The mixture powder was finally heated under N2 and H2 atmosphere to obtain CoO‑MO X The powder is mixed with elemental Bi to obtain a cobalt-bismuth ternary liquid alloy catalyst; the present invention also discloses a method for applying the catalyst to methane cracking and hydrogen production, comprising: heating the preheating furnace to a certain temperature, introducing pure methane gas, and reacting under normal pressure, at a temperature of 500 to 700°C, with a methane space velocity of 1 to 100 mL / g·min, and after the reaction is completed, the temperature drops to room temperature in an N2 atmosphere, and the carbon product is taken out of the reaction tube after cooling. The catalyst disclosed by the present invention has the advantages of high activity, good stability, strong methane cracking ability, mild reaction conditions, simple preparation process, and long life.

The invention discloses an alkaline earth metal modified aluminum oxide loaded nickel-based catalyst as well as preparation and application thereof. The alkaline earth metal modified aluminum oxide loaded nickel-based catalyst comprises a nanofiber-shaped gamma-Al2O3 carrier, Ni and alkaline earth metal oxide, wherein the Ni and the alkaline earth metal oxide are loaded on the carrier; the alkaline earth metal is at least one of Mg and Ca. The invention provides application of the alkaline earth metal modified aluminum oxide loaded nickel-based catalyst in a methane dry reforming reaction or a methane cracking reaction. The thermal stability and the carbon deposition resistance of the catalyst can be effectively improved, and the catalyst has good catalytic performance in a methane dry reforming reaction and a methane cracking reaction.

According to the new energy power generation and electricity hydrogen hybrid energy storage integrated comprehensive energy system, new energy is used for power generation, and a methane cracking hydrogen production device is used for converting methane into hydrogen to serve as a raw material to be used for power generation of a fuel cell and a micro gas turbine. The problems that due to randomness, volatility and intermittency of wind energy and solar energy, stability energy storage equipment lacks, power supply reliability is reduced, and power supply quality is affected are solved. In addition, the fuel cell and the micro gas turbine take hydrogen as fuel and cannot consume fossil fuel, so that carbon emission and pollution are reduced. Meanwhile, compared with hydrogen production through electrolysis of water, hydrogen production through methane conversion by the methane cracking hydrogen production device, complexity in the energy conversion process is reduced, and the overall energy utilization efficiency is improved. A methane cracking hydrogen production technology is introduced, so that the yield and quality of hydrogen are improved, and the whole process is green, environment-friendly and pollution-free. According to the invention, the energy utilization rate is improved while the carbon emission is reduced.

The utility model belongs to the technical field of methane hydrogen production, and particularly relates to a methane cracking hydrogen production system which comprises a molten metal reactor, the bottom of the molten metal reactor is connected with a methane inlet pipe, and the upper portion of the molten metal reactor is connected with a hydrogen discharge pipe and a carbon flow guide pipe. A buffer area, a reaction area and a hydrogen buffer area are sequentially arranged in the shell from bottom to top, the buffer area is used for conducting gas diffusion on methane to enable the methane to enter the reaction area, the methane is subjected to a high-temperature cracking reaction in the reaction area to generate hydrogen and carbon black, and the hydrogen upwards enters the hydrogen buffer area and is discharged through a hydrogen discharging pipe I; carbon black is deposited upwards at the bottom of the hydrogen buffer area, a carbon scraping device is arranged in the methane cracking system and used for pushing and sweeping the carbon black, and the carbon black enters a carbon collecting and cleaning device through a carbon flow guide pipe.

The present disclosure relates to the field of catalytic reactors, specifically to a low-temperature catalytic methane splitting reactor operating between 500°C and 650°C. The reactor is designed for the continuous production of high-purity hydrogen and graphitic carbon, with no CO₂ emissions, using a novel combination of supported catalysts, reaction module, and a membrane-based gas separation system.

The invention discloses a monolithic foamed nickel catalyst, a preparation method of the monolithic foamed nickel catalyst and efficient application of the monolithic foamed nickel catalyst in methane dry reforming, and relates to a strategy of in-situ construction of a Ni interface active site monolithic catalyst by taking porous foamed metal as a substrate. The reaction rate of methane dry reforming is improved by utilizing excellent thermal conductivity and abundant three-dimensional channels of a foamed nickel structured metal material, and adverse effects of sintering, carbon deposition and the like on active sites caused by methane cracking and carbon monoxide cracking are balanced; the monolithic catalyst prepared by the invention is applied to a methane dry reforming reaction with a certain concentration, under the conditions that the pressure is 0.1-1 MPa, the mass space velocity is 10000-50000 mL.gcat <-1 >. H <-1 >, CH4: CO2: N2 is 1: 1: 3 and the temperature is 650-700 DEG C, the CO2 conversion rate exceeds 85%, the CH4 conversion rate exceeds 75%, and the monolithic catalyst is expected to be applied to an industrial methane dry reforming process.

The invention relates to a rotary table small hole shunting natural gas cracking decarburization hydrogen production and in-situ power generation device, and aims to solve the problems of high methane cracking energy consumption, low methane conversion rate, difficulty in preparation of a high-quality carbon material, low hydrogen production efficiency, high storage and transportation safety risk and the like. The device is provided with a natural gas shunting turntable, so that methane is uniformly shunted into molten metal and is efficiently cracked, and a high-quality carbon product and hydrogen are prepared. Raw material airflow is subjected to three-stage preheating through a heat exchanger where hydrogen power generation flue gas, a carbon material at an outlet of a cracker and mixed gas (hydrogen and residual natural gas) are located. Extra heat loads needed by natural gas molten metal cracking are supplemented through hydrogen separated from cold exchange mixed gas in an in-situ power generation mode, and surplus hydrogen electricity is merged into a power grid. According to the device, waste heat and hydrogen energy are fully utilized for in-situ cyclic power generation, gas-liquid contact is enhanced, residual gas is subjected to cyclic cracking, and the reaction efficiency is improved, so that mass production of high-quality carbon materials is achieved through safe and efficient utilization of the hydrogen energy, and the market demand of the high-quality carbon materials is relieved.

The invention discloses a device and a method for producing hydrogen by catalyzing light alkane through ternary liquid metal based on electromagnetic induction. The device comprises an electromagnetic induction coil, a bubbling bed reactor and a gas distributor, the electromagnetic induction coil is arranged around the bubbling bed reactor, and the central axis of the electromagnetic induction coil coincides with or is perpendicular to the central axis of the bubbling bed reactor; the gas distributor is fixedly mounted at the gas inlet end of the bubbling bed reactor; the bubbling bed reactor is filled with a ternary liquid catalyst; according to the method, a nickel bismuth-indium compound is used as a ternary liquid metal catalyst, electromagnetic induction heating is used as a heating mode to directly heat the ternary liquid metal catalyst, and light alkane is introduced into the ternary liquid metal catalyst for cracking hydrogen production. The invention can solve the technical problems of low catalytic activity of the liquid metal catalyst, low methane conversion rate, low energy utilization rate in the reaction process and the like in the existing methane cracking hydrogen production method.

The invention relates to the technical field of comprehensive energy utilization, and provides a comprehensive energy system utilizing LNG (Liquefied Natural Gas) multi-energy complementary comprehensive output, which comprises an LNG cold energy utilization system, a methane cracking hydrogen production system, a power generation and power supply system, a waste heat centralized utilization system and a product supply system. A natural gas direct cracking hydrogen production technology, an LNG (Liquefied Natural Gas) cold energy utilization technology and a waste heat utilization technology are mainly utilized to realize natural gas state conversion, hydrogen production and hydrogen pre-cooling, and liquid hydrogen is prepared by utilizing a multi-stage circulating hydrogen cooling technology; meanwhile, by-product carbon of the methane cracking hydrogen production technology can be used as a high-purity carbon raw material after being captured and processed, and is used for processing various by-products. The system has the advantages of comprehensive energy resource output, extremely low carbon comprehensive emission and pollutant emission, cold and hot energy comprehensive regulation and control, energy safety guarantee and the like, and zero-carbon liquid hydrogen can be provided in a more energy-saving and environment-friendly manner.

The invention relates to a power generation system for coupling methane cracking hydrogen production with a solid oxide fuel cell, which is characterized by comprising a solid oxide fuel cell power generation module, a methane cracking hydrogen production module, an afterburning module and an air preheating module, methane gas passes through the methane cracking hydrogen production module to prepare hydrogen, the prepared hydrogen is respectively fed into the solid oxide fuel cell power generation module and the afterburning module to participate in reaction through a three-way valve, and the air preheating module is used for preheating air and then feeding the air into the solid oxide fuel cell power generation module to participate in reaction. And the afterburning module is used for feeding high-temperature gas generated after the reaction of hydrogen and air into the methane cracking hydrogen production module for providing heat for the methane cracking hydrogen production module. According to the invention, a methane direct cracking hydrogen production process is combined with a solid oxide fuel cell power generation system, so that the problems of tedious process flow, complex system, high carbon emission, large water consumption and the like of a methane hydrogen production coupling solid oxide fuel cell power generation system are solved.

The invention discloses a preparation method and application of a nickel-cobalt-based photo-thermal catalyst, NiCo alloy nanoparticles of the catalyst are uniformly loaded on amorphous Al2O3 nanosheets, metal elements in the catalyst comprise three metal elements of Ni, Co and Al, and the molar ratio of Ni to Co to Al is 1: 1: 1-3: 1: 1. The NiCo alloy catalyst shows excellent activity in photo-thermal methane cracking and photo-thermal methane dry reforming reaction; compared with traditional thermocatalysis, the catalyst provided by the invention utilizes light as energy input to drive the methane conversion reaction, and reduces energy input required by the reaction, so that the photo-thermal methane conversion utilization reaction adopted by the invention is more environment-friendly and energy-saving than a system in the prior art; the high-added-value carbon nanofibers are prepared through photo-thermal methane cracking for the first time, the diameter of the carbon nanofibers is about 30 nm, the length of the carbon nanofibers can reach micron, and the method is expected to be amplified in industry and applied practically.

The invention discloses a preparation method of a Sn-Bi-Ni-Cu quaternary liquid alloy methane cracking catalyst, production raw materials comprise composite melt metal and composite transition metal, and the mass ratio of the composite melt metal to the composite transition metal is 1: (0.3-1.2); the composite melt metal is composed of Sn and Bi according to the mass ratio of 1: (1.3-1.7); the composite transition metal is composed of Ni and Cu according to the mass ratio of 1: 0.15-1.2. The quaternary liquid alloy catalyst has the advantages that: 1) compared with the existing catalyst for hydrogen production by methane cracking, the quaternary liquid alloy catalyst provided by the invention can stably operate for more than 1000 hours in a range of normal pressure to 3MPa and air speed of 100-100mL. G <-1 >. H <-1 >, the active phase retention rate is more than 95%, and the quaternary liquid alloy catalyst is especially suitable for alkane pyrolysis hydrogen production, CO2 hydrogenation and easy carbon deposition reaction systems, and has a wide application prospect; a new material design thought and an engineering implementation scheme are provided for the field of liquid metal high-temperature catalysis; and 2) experiments show that the quaternary liquid alloy catalyst prepared by the method provided by the invention can significantly improve the carbon sequestration rate and the hydrogen yield.

According to the nickel-based catalyst and the preparation method and application thereof, through Ga modification, the methane cracking depth can be reduced, and then carbon deposition is effectively inhibited; ceO2 oxygen vacancies can effectively activate CO2, the generated intermediate oxygen species O further reacts with deposited carbon so as to achieve the purpose of carbon cleaning, the GaxNi / CeO2 catalyst is prepared by adopting a urea homogeneous precipitation method, 1000-hour long-term stable catalytic conversion of the nickel-based catalyst in a carbon dioxide methane dry reforming reaction is achieved, and the catalyst has the advantages of simple process, low cost and high efficiency. The nickel-based catalyst prepared by the method can keep good catalytic stability.

The invention relates to the technical field of hydrogen production through methane cracking, in particular to a sea urchin-shaped composite catalyst, a preparation method thereof and application of the sea urchin-shaped composite catalyst in hydrogen production through methane cracking. The obtained sea-urchin-shaped composite catalyst has a sea-urchin-shaped appearance, can efficiently catalyze methane cracking to produce hydrogen, simultaneously captures CO2 produced by vapour gasification carbon deposition in a catalyst regeneration process to generate CaCO3, promotes the gasification hydrogen production of the carbon deposition and strengthens the removal effect of the carbon deposition, and the generated CaCO3 can also be converted into CO in situ, so that the catalyst has a good application prospect. The obtained catalyst has good anti-sintering performance and excellent recycling performance.

The invention discloses an IES scheduling method and device based on coordinated hydrogen production and low carbon willingness, and relates to the field of comprehensive energy system optimization scheduling. According to a methane cracking hydrogen production method for kallaite hydrogen production, a kallaite hydrogen production mathematical model is constructed; the purposes of coordinating the proportions of green hydrogen and kallaite hydrogen prepared in different time periods and reducing the carbon emission of the system are achieved; analyzing the carbon footprint of the hydrogen-containing comprehensive energy system for supplying energy in a set time period according to the purchase willingness of a user for the zero-carbon energy, and dividing the energy supplied to the load side by the hydrogen-containing comprehensive energy system into zero-carbon electric energy heat energy and common electric energy heat energy; an extra price coefficient is set for the zero-carbon energy, and extra benefits of the zero-carbon energy are obtained; according to a set objective function, constructing a low-carbon economic dispatching model and constraint conditions; and inputting the set parameter data into the low-carbon economic dispatching model to output a hydrogen-containing comprehensive energy system dispatching strategy. The total operation cost and carbon emission of the system can be effectively reduced.

Disclosed is a method of producing hydrogen and carbon nanotubes by methane decomposition and its use as an electrode material, and more particularly, a method of manufacturing an electrode material for an electrode, including promoting methane decomposition to produce high-purity hydrogen and carbon nanotubes by using a nickel-based catalyst, and manufacturing an electrode material using the carbon nanotubes.

The invention discloses a method for constructing a high-conductivity / heat-conductivity carbon material based on microwave induction, and belongs to the technical field of nano carbon material synthesis. According to the method, methane and auxiliary gas are introduced into a variable-frequency microwave vapor deposition system, and the microwave frequency is dynamically regulated and controlled within the range of 2.43-7.5 GHz, so that the methane cracking rate, plasma energy distribution and deposition kinetics are regulated; controllable deposition of multi-scale and multi-morphology composite carbon structures (carbon nanotubes, graphene-like and amorphous carbon) on the surface of a single substrate under the constant temperature condition is achieved, and therefore the microstructure and the electromagnetic response performance are optimized. According to the method, the frequency conversion microwave technology is introduced into a methane cracking deposition system for the first time, atomic-scale controllable deposition of the carbon material is achieved, complex temperature gradient control is avoided, and the obtained carbon-based material has high electric conductivity / heat conductivity, wide-frequency-band shielding effectiveness and excellent structural stability.

This application discloses a process for improving the yield of HCN prepared by the Andruse process, belonging to the field of HCN preparation technology. This application utilizes the tail gas after HCN removal and dehydration reactions, using residual methane in the tail gas to increase methane conversion, using CO in the tail gas to inhibit methane decomposition and improve methane selectivity, and using H2 in the tail gas, with H2 combustion providing heat instead of the heat provided by methane decomposition. This improves the conversion rate of methane to HCN, increases the overall reaction yield, and eliminates ammonia residue in the post-reaction gas, saving the ammonia removal step. Simultaneously, it reduces air consumption and increases the ratio of ammonia to methane to oxygen, allowing the reaction to proceed far from the explosion zone, thus improving process safety.

The present disclosure relates to a low temperature method for the production of pure hydrogen using a methane rich stream as raw material, and to perform in-situ catalyst regeneration. The process involves the decomposition of methane into COx-free hydrogen in an electrochemical / chemical membrane / chemical reactor or chemical fluidised reactor. As the methane decomposition reaction progresses, carbon structures (whiskers) are accumulated at the catalyst surface leading eventually to its deactivation. The catalyst regeneration is achieved using a small fraction of the produced hydrogen to react with carbon formed at the catalyst surface provoking the carbon detachment, thus regenerating the catalyst. This is achieved either by chemical / electrochemical methanation of carbon at the catalyst interface with hydrogen / protons or by rising the temperature of the catalyst, ideally keeping the reactor temperature constant. A single compact device is described, enabling the hydrogen production, hydrogen purification and catalyst regeneration.

The invention relates to a gamma-Al2O3 loaded nickel-based catalyst for methane cracking and a preparation method of the gamma-Al2O3 loaded nickel-based catalyst. The preparation method comprises the following steps: dissolving nickel acetylacetonate and cobalt acetylacetonate in an inert organic solvent, stirring to uniformly mix the nickel acetylacetonate and the cobalt acetylacetonate, heating to 90-110 DEG C, keeping for 15-30 minutes to form a mixed solution, rapidly cooling to crystallize, carrying out solid-liquid separation, washing and drying to obtain a solid-phase precursor; grinding and mixing the solid-phase precursor and a gamma-alumina carrier, heating to 650-750 DEG C in an air atmosphere, keeping for 3-5 hours, and then naturally cooling to room temperature to obtain a calcined product; and heating the calcined product to 650-750 DEG C in a mixed atmosphere of hydrogen and inert gas, roasting and reducing for 3-5 hours, and then naturally cooling to room temperature to obtain the gamma-aluminum oxide loaded nickel-based catalyst. The prepared catalyst is high in carbon deposition resistance and sintering resistance, and has excellent reaction activity and stability in a methane cracking reaction.

The utility model relates to the field of methane high-temperature catalysis systems, in particular to a methane high-temperature catalysis system based on a liquid metal catalyst. The methane high-temperature catalytic system comprises a heat regenerator, a heater, a methane high-temperature catalytic cracking furnace, a hydrogen purification device, a desorbed gas compressor, a three-phase separator, a cooler and a deflation compressor, and the cooler and the three-phase separator are respectively connected to the deflation compressor through pipelines; the deflation compressor, the desorbed gas compressor and the heat regenerator are respectively connected to the hydrogen purification device through pipelines, and the desorbed gas compressor, the methane high-temperature catalytic cracking furnace and the heater are respectively connected to the heat regenerator through pipelines. Through combined communication of the heat regenerator, the heater, the methane high-temperature catalytic cracking furnace, the hydrogen purification device, the desorbed gas compressor, the three-phase separator, the cooler and the air release compressor, automatic continuous production is realized, and through system heat balance optimization, energy consumption is greatly reduced, and methane cracking efficiency is greatly improved.

The utility model discloses a methane cracking hydrogen production and carbon product continuous separation and purification device which mainly comprises a methane cracking reaction part for providing a reaction space for methane cracking reaction, a carbon product separation and collection part for realizing separation of a carbon product and metal catalyst impurities and facilitating collection of the carbon product, and a carbon product separation and collection part for realizing separation of the carbon product and metal catalyst impurities. The catalyst feeding part is used for timely supplementing a catalyst consumed in the reaction process, and the gas circulating part is used for recycling uncracked methane, improving the yield of hydrogen production through methane cracking and reducing methane gas waste. According to the utility model, methane is cyclically cracked in the molten metal catalyst, so that the methane cracking efficiency is improved; by collecting and purifying a carbon product, the operation cost is reduced, the hydrogen purity is improved, clean energy is generated, and carbon-free emission of energy is realized.

The invention belongs to the technical field of clean energy, and particularly relates to a method for researching a stable catalytic mechanism of carbon black enhanced activated carbon, which comprises the following steps: S1, material preparation, S2, compounding of carbon black and activated carbon, S3, characterization analysis, S4, catalytic performance test and methane cracking reaction: carrying out methane cracking reaction at high temperature, such as 700-1000 DEG C, the hydrogen yield and catalytic activity of the catalyst are tested, stability test is performed, methane cracking reaction is performed for a long time, the stability and inactivation condition of the catalyst are detected, the active carbon and carbon black materials with different inactivation performance are subjected to comparative research, and the mechanism of active carbon inactivation and carbon black catalytic performance self-enhancement is explored. A control mechanism for reducing the deactivation rate of the activated carbon carrier is established, and the efficiency of hydrogen production by methane cracking and the stability of the catalyst are further improved by researching a scheme of enhancing the catalytic performance of the activated carbon by carbon black.

The invention provides a method and a device for multi-stage reduction of iron by utilizing natural gas graded reforming, and belongs to the technical field of energy conservation, emission reduction and hydrogen energy ironmaking. The method for multi-stage reduction of iron by using natural gas fractional reforming comprises the following steps: performing natural gas fractional reforming in a gas production unit, wherein hydrogen and carbon monoxide are produced step by step by using a methane cracking reaction and a carbon-carbon dioxide neutralization reaction; according to the reaction characteristics of different reduction stages of the original iron oxide, hydrogen and mixed gas of hydrogen and carbon monoxide in different proportions are supplied to different reduction stages of the original iron oxide so as to carry out a multi-stage iron reduction reaction, and elemental iron is obtained; wherein in the multi-stage reduced iron reaction, the valence state of the original iron oxide is gradually reduced until zero-valence-state elemental iron is obtained.

The present disclosure relates to a carbon dioxide methanation and methane cracking coupled carbon sequestration power generation system and method. The system comprises a methane cracking unit, a methanation reaction unit and an energy recovery unit. The method uses a molten medium catalyst to catalyze methane cracking to produce hydrogen and solid carbon material; the hydrogen produced by methane cracking is used for Sabatier reaction to generate methane and water; the methane generated by Sabatier reaction is used for hydrogen production and solid carbon material; the heat released by Sabatier reaction and / or the heat discharged after the endothermic methane cracking reaction is used for power generation by a heat power conversion power generation system. The present disclosure solves the problem of catalyst carbon deposition and deactivation through process innovation and system integration, reduces the dependence on purchased hydrogen, and realizes the step-by-step utilization of energy in the reaction process.

The invention discloses a silane purification process which comprises the following steps: under the conditions of 250-350 DEG C and illumination, methane of silane containing methane impurities is cracked into solid carbon and hydrogen under the action of a photo-thermal catalyst reduced by hydrogen; the photo-thermal catalyst is a core-shell bifunctional catalyst and / or a core-shell-photosensitive three-functional catalyst; the core-shell bifunctional catalyst comprises a nickel core and a mesoporous silica shell wrapping the nickel core; the core-shell-photosensitive three-function catalyst comprises a nickel core, a mesoporous silica shell wrapping the nickel core and a CeO2 photosensitive layer distributed on the outer surface of the mesoporous silica shell in a nano island structure; in the photo-thermal catalyst, the pore diameter of the mesoporous silica shell is 2.3-2.7 nm.

The invention relates to the field of alkane cracking, and discloses an alkane cracking method, which comprises: (1) carrying out steam cracking on a cracking raw material containing alkane; (2) separating methane-rich gas from the steam cracking product; (3) performing methane cracking on the methane-rich gas; wherein the methane cracking is carried out in the presence of a plasma or a plasma and a catalyst. According to the method for cracking the alkane, the alkane cracking raw material can be cracked, methane in the cracking product can be further cracked, the methane in the cracking product is fully utilized, and meanwhile carbon emission is reduced.

The utility model relates to the technical field of hydrogen production, storage and transportation, in particular to a low-temperature adsorption type hydrogen production and storage and transportation system. The system comprises a liquefied natural gas storage tank, a cold energy recoverer, a heater, a methane cracking furnace, a separator, a desorbed gas compressor, a hydrogen compressor, a low-temperature adsorption tank and a low-temperature adsorption type gas cylinder, and the liquefied natural gas storage tank, the cold energy recoverer, the heater and the methane cracking furnace are sequentially communicated through pipelines. The outlet end of the methane cracking furnace is connected to the inlet of the heater through a pipeline, the outlet of the heater is connected with the separator through a pipeline, and the outlet of the separator is respectively connected to the cold energy recoverer and the pipeline between the cold energy recoverer and the heater through two pipelines. Through cooperation of the cold energy recoverer, the heater, the methane cracking furnace, the separator, the desorbed gas compressor, the hydrogen compressor, the low-temperature adsorption tank and the low-temperature adsorption type gas cylinder, efficient production and high-density storage and transportation of hydrogen are realized by taking natural gas as a raw material.

The invention relates to a carbon dioxide methanation and methane cracking coupled carbon sequestration power generation system and method. The system comprises a methane cracking unit, a methanation reaction unit and an energy recovery unit. According to the method, a molten medium catalyst is adopted to catalyze methane cracking to generate hydrogen and a solid carbon material; hydrogen generated by methane cracking is used for a Sabatier reaction to generate methane and water; methane generated by the Sabatier reaction is also used for cracking to produce hydrogen and solid carbon materials; the heat released by the Sabatier reaction and / or the heat flowing out after heat absorption of the methane cracking reaction are / is used for power generation of the heat-to-power conversion power generation system. Through process innovation and system integration, the problem of catalyst carbon deposition inactivation is solved, outsourced hydrogen dependence is reduced, and gradient utilization of energy in the reaction process is achieved.