74 results about "Methane decomposition" patented technology

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.

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 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 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 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.

Method for the production of hydrogen and renewable carbon from catalytic pyrolysis of methane for the steel industry including the steps of: - receive a gas stream including methane - receive an amount of amorphous carbon catalyst - at a controlled temperature in a reactor, perform a methane cracking reaction using the amorphous carbon catalyst generating a mixture of hydrogen and an additional gas, preferably methane; and an amorphous coke carbon comprising the catalyst carbon and carbon deposited during cracking.

The invention belongs to the technical field of methane cracking hydrogen production, and particularly relates to a catalyst for methane cracking hydrogen production as well as a preparation method and application thereof. The preparation method of the catalyst for hydrogen production by methane cracking comprises the following steps: preparing the KCC-1 carrier; preparing a metal precursor solution: dissolving metal salt in deionized water to form a metal salt solution with specific concentration; the preparation method comprises the following steps: adding a KCC-1 carrier into a metal salt solution, and stirring at room temperature to form uniform slurry so as to ensure that metal salt is in full contact with the KCC-1 carrier; and heating and continuously stirring until the solvent is completely evaporated, drying the obtained solid, and calcining to obtain a metal / KCC-1 composite material, namely the catalyst. The high specific surface area of the KCC-1 carrier and a radial fiber mesoporous network are utilized, so that metal species are highly dispersed on the surface of the carrier and in pore channels, the number of effective active sites is remarkably increased, and the methane cracking activity and stability are improved; by adjusting the composition and proportion of the metal precursor solution, controllable adjustment of the morphology of the cracked carbon material can be achieved, preparation of high-purity hydrogen and collaborative output of high-added-value carbon nanomaterials are both considered, and the method is suitable for a fixed bed or fluidized bed methane cracking hydrogen production device.

This invention discloses a near-zero CO2 emission hydrogen and solid carbon co-production device, relating to the fields of catalytic gas cracking hydrogen production via molten liquid media and carbon materials technology. It addresses the problems of high carbon emissions, high energy consumption, easy catalyst deactivation, and difficulty in separating carbon products in existing hydrogen production technologies. The device includes a methane cracking reactor with an internal methane cracking reaction zone and a carbon product storage transition zone between the reactor and the reaction zone. An air reactor is connected to a circulation mechanism. A novel energy supply method provides the necessary energy for methane cracking, achieving zero CO2 emissions during the energy supply process. This invention utilizes the excellent thermal conductivity, fluidity, and catalytic capacity of the molten liquid medium to effectively solve problems such as catalyst deactivation. By setting up the methane cracking reaction zone and the carbon product storage transition zone, automatic and continuous separation of solid carbon particles is achieved, ensuring the continuous, stable, and safe operation of the entire device.

The invention relates to the field of methane cracking, in particular to a process and system for co-producing hydrogen and a carbon material through methane cracking, and the process for co-producing hydrogen and the carbon material through methane cracking comprises the following steps: S1, a first feed gas is subjected to a methane cracking reaction in a first reactor to obtain a first mixed gas and a first carbon material; s2, filtering the second feed gas, the first mixed gas generated in the step S1 and the first carbon material, intercepting the first carbon material, and flowing out the second feed gas and the first mixed gas, namely second mixed gas; s3, the second mixed gas obtained in the step S2 is subjected to a methane cracking reaction through a second reactor, and hydrogen-rich mixed gas, tar steam and a second carbon material are generated; s4, separating out tar from the hydrogen-rich mixed gas and the tar steam obtained in the step S4 through oil-gas separation, and collecting the hydrogen-rich mixed gas; s5, purifying the hydrogen-rich mixed gas obtained in the step S4 to obtain hydrogen and purge gas; s6, washing and drying the first carbon material intercepted in the step S2 to obtain a dried first carbon material; and S7, combusting the tar obtained in the step S4 by using the purge gas obtained in the step S5, and providing heat for the drying treatment in the step S6 by using high-temperature flue gas generated by combustion.

The present application relates to the technical field of methane cracking and carbon production, and in particular to a method for methane cracking and carbon production based on molten medium regulation. The method comprises the following steps: placing a molten medium catalyst in a tubular furnace, heating the temperature to a reaction temperature at a heating rate of 7-10°C / min, introducing argon gas during the heating process, introducing methane when the temperature reaches the reaction temperature, and cooling the argon atmosphere to room temperature after the reaction is completed, and collecting the produced carbon product. The reaction temperature is 850-1000°C; the molten medium catalyst comprises a modified metal-based material and a chloride salt; and the modified metal-based material comprises a modified metal and a foamed metal.

The invention discloses a nitrogen-doped carbon modified Ni / MgAlO catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method comprises the following steps: firstly, taking a magnesium source, an aluminum source, a nickel source and hexamethylenetetramine as raw materials, preparing NiO / MgAlO through hydrothermal reaction and roasting, then carrying out surface modification on the NiO / MgAlO by taking dopamine hydrochloride as a carbon source, and carrying out carbonization treatment in a nitrogen atmosphere to prepare the Ni / MgAlO catalyst. A strong electron interaction exists between a carbon modifier introduced by carbonization and nickel, and the migration rate of carbon generated by methane cracking on the surfaces of nickel particles is accelerated through a homogeneous repulsion action mechanism, so that the formation of coated carbon is reduced, and the catalytic activity of the catalyst and the selectivity to hydrogen are enhanced; the carbon modifier on the surface of the catalyst has a space shielding protection effect on nickel particles, carbon generated by methane cracking is prevented from directly covering the surfaces of the nickel particles, meanwhile, sintering agglomeration of the nickel particles at high temperature is inhibited, and the catalytic stability of nickel is enhanced.

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.