609 results about "Biomass gasification" patented technology

The invention provides a PLC-based biomass gasification industrial steam full-automatic intelligent control system and method. The system comprises a data acquisition module, a modeling identification module, a multi-objective optimization module, a rolling prediction control module, a coordination execution module, a self-adaptive correction module and an abnormal fault tolerance and safety control module. The system collects operation data of a feeding system, a gasification furnace, a boiler, a steam-water system and an environmental protection system in real time through a PLC platform, a dynamic coupling model of a combustion side, a steam-water side and an environmental protection side is established, and a multi-target constraint optimization model with stable steam pressure, up-to-standard emission and minimum energy consumption as targets is constructed. According to the invention, unattended operation of the biomass gasification industrial steam system is realized, the system has the advantages of high control precision, low energy consumption, stable emission and strong fault-tolerant capability, and the intelligence and safety of the industrial steam system are obviously improved.

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

The invention provides a green low-carbon biomass coupling fused salt energy storage methanol preparation system, and belongs to the field of methanol preparation systems. The problem that methanol purge gas is released and residual biomass gas is generated and needs to be treated in the process of preparing methanol through biomass gasification is solved. One part of new energy electricity is used for electrolyzing water, the other part of new energy electricity serves as abandoned electricity to enter a fused salt electric heater, hydrogen generated by electrolyzing water enters a catalytic synthesis tower, oxygen is used for biomass gasification, generated carbon monoxide, hydrogen and carbon dioxide enter the catalytic synthesis tower, and methanol is synthesized in the catalytic synthesis tower. Biomass, redundant biomass gas and formaldehyde purge gas enter the high-temperature and high-pressure biomass fluidized bed boiler, then superheated steam generated by the high-temperature and high-pressure biomass fluidized bed boiler and part of steam serve as a catalytic temperature heat source for methanol production, the remaining steam enters the power generation system to be used for power generation, and stable power supply of the whole system is guaranteed. And the generated high-temperature and high-pressure steam is used for power generation to improve the unit efficiency.

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

The invention discloses a biomass gasification experimental design and performance prediction method based on support vector and transfer learning, which comprises the following steps: establishing an Aspen plus simulation model, adjusting the gasification temperature to air equivalence ratio in the Aspen plus model, and obtaining a biomass gasification simulation data set covering wide boundary operation conditions; taking the simulation data set as a training sample, constructing a simulation agent model, and searching an optimal hyper-parameter; extracting a support vector sample through a support vector regression method, designing experimental working condition points, and collecting experimental data to obtain an experimental data set; taking the experimental data set as a model input sample, and outputting a predicted value by the model; performing linear migration on a model prediction result; and performing secondary correction on the difference between the migrated result and the experimental data to obtain a high-precision calibration model fusing linear migration and residual correction. According to the method, the problems of high acquisition cost of biomass gasification experiment data, limited simulation data precision and the like are effectively solved, a model with better generalization ability and higher interpretability is constructed under limited experiment samples, and accurate prediction of product distribution is realized.

Process for the synthesis of methanol comprising the steps of: subjecting a biomass to a gasification process in presence of steam and an oxidant; subjecting the so obtained gasifier stream to water gas shift conversion and purification to yield a synthesis gas with hydrogen, carbon monoxide and CO2; mixing said synthesis gas with a second stream of synthesis gas to yield a third stream of synthesis gas; feeding said third stream of synthesis gas to a methanol synthesis loop wherein a crude methanol and a tail gas retaining methane are produced; subjecting said tail gas to a reforming step in presence of an oxidant to generate said second stream of synthesis gas.

The invention relates to the technical field of green fuel preparation, and discloses a method for preparing green fuel by coupling biomass gasification and combustion, which comprises the following steps: (1) separating N2 from air, taking a part of residual gas as a gasification agent, and taking the other part as combustion gas; (2) carrying out chemical chain gasification on the biomass through steam under the condition of a gasifying agent to obtain H2 and CO2; (3) carrying out chemical looping combustion on the biomass under the conditions of an oxygen carrier and combustion gas to obtain CO2; (4) electrolyzing a part of obtained CO2 by using electric energy obtained by biomass chemical looping combustion to obtain CO; (5) synthesizing N2 and H2 to prepare a green NH3 product; and synthesizing H2, CO2 and CO to prepare a green methanol product. According to the method, a biomass fuel chemical looping power generation and biomass chemical looping gasification coupling technology is applied, a carbon source in biomass is fully utilized, meanwhile, green NH3 and methanol products are prepared, and efficient utilization of resources is achieved.

The invention belongs to the technical field of biomass energy power generation, and particularly relates to a decoupling type biomass gasification power generation system and a multi-parameter cooperative control method.The method comprises the steps that 1, biomass raw materials are fed into a vertical multi-section decoupling gasification furnace to be gasified, a gasifying agent and water vapor are introduced into the decoupling gasification furnace, and the biomass raw materials are gasified by adjusting the introduction amount of the gasifying agent and the water vapor; the temperature of a reduction zone is controlled to be 700-900 DEG C; 2) cooling a gasification product of the decoupling gasification furnace through a heat exchanger, performing primary filtration through a filter I, removing moisture through a steam-water condensation separator, pressurizing through a Roots blower, performing secondary filtration through a filter II, and feeding into an internal combustion engine for power generation; and (3) gas exhausted by the internal combustion engine is supercharged by an exhaust turbocharger, compressed by a compressed air generator and sent to the decoupling gasifier as a gasifying agent. The system has the advantages that in-situ high-temperature catalytic cracking of tar, efficient utilization of waste heat and stable operation of the system can be realized, the power generation efficiency is improved, and meanwhile, the equipment cost is reduced.

The invention relates to a fluidized bed and bubbling bed combined biomass gasification device, which comprises a biomass gasification device, a fuel feeding system, an ignition system, a bed material supply system, a cyclone separator, a special biomass high-temperature gas boiler, an air blower, an induced draft fan and the like. Biomass gas is produced in a mode of combining a fluidized bed and a bubbling bed and is used by a special boiler. According to the device, an existing fixed bed gasification furnace cooling device is omitted, biomass high-temperature fuel gas is used as a medium, more heat is utilized in a rear fuel gas special boiler, and the water cooling jacket cooling loss of the fixed bed gasification furnace is reduced to a great extent. And meanwhile, steam generated by the rear-end boiler is fed into the bubbling bed to further gasify a by-product (charcoal) of fluidized bed gasification reaction, so that more heat energy is released, the biomass gasification efficiency is greatly improved, and the biomass energy is more fully utilized.

The invention discloses a method for capturing carbon dioxide to participate in biomass gasification to prepare green methanol, and particularly relates to the field of biomass energy utilization, a gasification furnace body, a dust removal heat exchanger and a purification water washing box are included, and the exhaust end of the purification water washing box is connected with a high-voltage electrostatic decoking device through a pipeline; the exhaust end of the high-voltage electrostatic decoking device is connected with a synthetic gas cabinet, the synthetic gas cabinet is connected with a gas desulfurization and dechlorination purifier through a pipeline, and the exhaust end of the gas desulfurization and dechlorination purifier is connected with an effective gas reforming transformation box through a pipeline; and the effective gas reforming transformation box is connected with a gasifying agent inlet at the bottom end of the gasifier body through a pipeline. Carbon dioxide discharged in the secondary reforming transformation process of gasified synthesis gas is captured and fed into the gasifying agent at the front end, the carbon dioxide is doped into the gasifying agent, so that the oxygen proportion is reduced, a small amount of oxygen can promote pyrolysis and gasification reaction of biomass, the yield of hydrogen is increased, and waste gas utilization of the carbon dioxide is achieved.

The invention relates to an off-grid comprehensive energy hydrogen production system planning method and device for a hydrogen demand, and the method comprises the steps: constructing a hydrogen production-storage-use full-process model which comprises an off-grid hydrogen production section model, a compression buffer section model and an industrial synthesis section model; the off-grid hydrogen production section model comprises a water electrolysis hydrogen production model, a biomass gasification hydrogen production model and a natural gas reforming hydrogen production model, the compression buffer section model comprises a compressor model and a hydrogen storage tank model, and the industrial synthesis section model comprises an industrial hydrogen load model; a hydrogen production system double-layer planning model comprising an upper layer planning model and a lower layer operation model is constructed, the upper layer planning model takes the minimum construction and operation cost, the minimum carbon emission and the maximum total hydrogen production amount as the target, and the lower layer operation model takes the minimum operation cost as the target; and solving the bilayer planning model of the hydrogen production system to obtain an optimal planning scheme. The carbon emission in the hydrogen production process is reduced while the industrial requirements for stability and reliability of hydrogen are met.

The invention relates to the technical field of energy utilization, in particular to a system and method for preparing green methanol from biomass coupled green hydrogen, and the system comprises a water electrolysis hydrogen production device, a biomass gasification device, a biomass direct combustion device, a biomass power generation device and a methanol synthesis device, oxygen generated by the water electrolysis hydrogen production device is communicated with the biomass gasification device, hydrogen generated by the water electrolysis hydrogen production device, and the biomass gasification device and the biomass direct combustion device are communicated with the methanol synthesis device; and the biomass direct combustion device is connected with the biomass power generation device. According to the system for preparing the green methanol by coupling the biomass and the green hydrogen, the biomass is converted into the green methanol, high-value utilization of biomass resources can be achieved, and convenient conditions can be provided for long-distance conveying of products and absorption of wind, light and green electricity.

The invention provides a biomass gasification coupling iron ore powder reduction device and method with CO2 circulation, and relates to the technical field of direct reduction of iron from biomass gasification products. The biomass gasification coupling iron ore powder reduction device with CO2 circulation comprises a biomass gasification reaction device and a circulating fluidized bed reduction reaction device. The method comprises a method of a biomass gasification reaction device and a method of a circulating fluidized bed reduction reaction device. Through structural arrangement and application of the biomass gasification reaction device and the circulating fluidized bed reduction reaction device, CO2 gas circulation, zero carbon emission and high-purity iron raw material efficient utilization preparation can be achieved; the preparation method is simple and easy to operate, green and environment-friendly, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.

The invention discloses a biomass gasification product prediction method based on mechanism and data fusion driving, and the method comprises the steps: constructing a biomass gasification product prediction mechanism model, and inputting biomass gasification operation parameters into the model to obtain a prediction result; calculating a residual vector between a prediction result and actual experimental data; establishing a support vector regression model between the biomass gasification operation parameters and the residual vectors; and taking the output of the support vector regression model as an error compensation item of a biomass gasification product prediction mechanism model, constructing a biomass gasification product prediction model based on mechanism and data fusion driving, and predicting a biomass gasification product by using the model. Through fusion of a mechanism model and data driving, the problem of prediction deviation caused by model simplification hypothesis in a traditional method is solved, high-precision prediction of biomass gasification products is achieved, a theoretical basis is provided for real-time optimization of process parameters, and the method is suitable for industrial control of biomass gasification systems such as fluidized beds and fixed beds.

The invention belongs to the field of biomass gasification catalysts, and particularly relates to a preparation method of an energy-saving corrosion inhibition type decarburizing agent. According to the invention, under the action of the catalyst, ethylene carbonate and methylamine are adopted as basic raw materials to synthesize N-methyldiethanolamine, and then 1, 3-propane sultone is adopted to modify N-methyldiethanolamine, so that the carbon dioxide absorption amount and absorption rate of N-methyldiethanolamine are improved; the activating agent is added into the energy-saving corrosion-inhibition type decarburizing agent, so that the absorption rate of the decarburizing agent on carbon dioxide can be effectively improved, and the desorption energy consumption of the carbon dioxide is reduced; and the corrosion inhibitor is added, so that the corrosion of metal equipment can be effectively reduced.

The invention relates to the field of industrial process control and digital twinning, in particular to a biomass gasification process twinning optimization system and a biomass gasification process twinning optimization method. Five modules, namely a multi-source data intelligent sensing module, a hybrid evolutionary algorithm self-optimization module, a knowledge graph self-adaptive reconstruction module, a multi-time-scale collaborative calibration and prediction module and a closed-loop feedback iterative symbiosis module, are integrated; the system constructs a multi-dimensional deviation feature vector through the intelligent sensing module, and accurately recognizes model deviation; the parameter self-optimization module performs self-adaptive optimization on model parameters by using a particle swarm and differential evolution algorithm; if the optimization does not reach the precision, the knowledge graph module is started, and the model is reconstructed based on the graph neural network; the multi-time scale module ensures that the model is accurately calibrated and predicted under different time scales; the closed-loop feedback module realizes bidirectional information flow between the model and the entity, continuous iterative optimization is realized, and long-term consistency and adaptability of the model are improved; the system realizes conversion from passive early warning to active optimization.

The present invention provides a biomass gasification control system and a biomass gasification control method, and belongs to the field of biosynthesis, the biomass gasification control system comprises: a first-stage fluidized bed pyrolysis reactor for performing a preliminary pyrolysis reaction on a biomass raw material to obtain a pyrolysis reactant; the second-stage fluidized bed gasification reactor is used for carrying out gasification reaction on the pyrolysis reactant by utilizing various gasification agents to obtain target synthesis gas, including H2 and CO; wherein the multiple gasifying agents comprise oxygen, water vapor and carbon dioxide; the sensor monitoring module is used for monitoring real-time state data in the first-stage fluidized bed pyrolysis reactor and the second-stage fluidized bed gasification reactor; the central control module is used for sending out an adjusting instruction according to the real-time state data, and the adjusting instruction is used for adjusting and controlling the flow of the multiple gasifying agents, the rotating speed of the fan and the reaction temperature, so that the molar ratio of H2 to CO in the generated target synthesis gas is within a first threshold value range.

The invention provides a synthesis gas preparation method based on a double-circulation gasifier. The synthesis gas preparation method based on the double-circulation gasification furnace comprises the following steps: S1, feeding a biomass raw material and a gasification agent into the double-circulation gasification furnace for gasification; s2, performing primary separation on the synthesis gas generated by gasification, returning a solid material generated by the primary separation to the double-circulation gasification furnace, and performing secondary separation on the synthesis gas after the primary separation; and S3, returning the solid material generated by the second-stage separation to the double-circulation gasification furnace. According to the preparation method of the synthesis gas, the carbon conversion rate and the gasification efficiency can be effectively improved, the total concentration of carbon monoxide and hydrogen in the synthesis gas is greater than 65%, and the quality of the biomass gasification synthesis gas is greatly improved.

The invention provides a biomass gasification system and a fluidized bed gasification process, the system comprises a fluidized bed gasification furnace, a cyclone separator and a material returning leg, the fluidized bed gasification furnace is provided with a gasification cavity and a gas chamber, and a fluidized bed formed by bed materials is arranged in the gasification cavity. Bed materials are added into the gasification furnace in a spiral feeding and pneumatic conveying combined mode, a fluidized bed is established, biomass particles are added after temperature rise, the pressure in the gasification furnace is kept to be certain, and an auxiliary gasification agent enables the biomass particles to be in a fluidized state. According to the invention, the melting characteristic of biomass ash can be effectively improved, the problem of easy slag bonding during biomass gasification is solved, the gasification temperature is effectively increased, and the methane content in the synthesis gas is reduced. The bed material can catalytically crack tar generated in the biomass gasification process, the quality of synthesis gas is optimized, the synthesis gas is prevented from being bonded and attached to the metal wall of a downstream device, the yield of the synthesis gas and the stability of the device are improved, and the heat exchange efficiency of a downstream waste heat recovery unit is enhanced.

The biomass gasification pyrolysis fuel gas fluidized bed generator comprises a furnace body, a rotary vane arch breaking fire grate is arranged on the lower portion of the furnace body, the rotary vane arch breaking fire grate comprises multiple sets of crushing rollers rotationally arranged on the furnace body, the two axial ends of the multiple sets of crushing rollers penetrate out of the furnace body, and first gears are arranged at the two ends, located outside the furnace body, of the multiple sets of crushing rollers; the adjacent crushing rollers are meshed through a first gear and form reverse rotation; the grate mechanism further comprises striker plates symmetrically arranged on the two sides of the furnace body, the striker plates on the two sides are horizontally arranged in the furnace body in a sliding mode and connected with the crushing rollers on the outermost sides of the two ends respectively, a closed frame is arranged on the outer side of the furnace body, a driving motor is arranged on the outer side of the closed frame, and an output shaft of the driving motor extends into the closed frame. According to the biomass combustion furnace, arch elimination can be carried out after feeding or when an arch-shaped structure is generated in the biomass combustion process, the uniformity and stability of biomass combustion are guaranteed, and meanwhile, the fire grate can be prevented from being blocked.

The present application belongs to the technical field of biomass energy power generation, and particularly relates to a decoupling type biomass gasification power generation system and a multi-parameter collaborative control method, which comprises the following steps: 1) biomass raw materials are fed into a vertical multi-stage decoupling gasification furnace for gasification, a gasification agent and water vapor are introduced into the decoupling gasification furnace, the amount of the gasification agent and water vapor introduced is adjusted, and the temperature in the reduction zone is controlled at 700-900 DEG C; 2) the gasification products of the decoupling gasification furnace are cooled by a heat exchanger, then filtered by a filter I for the first time, water is removed by a steam-water condenser separator, pressurized by a Roots blower, filtered by a filter II for the second time, and then fed into an internal combustion engine for power generation; and 3) the gas discharged from the internal combustion engine is pressurized by an exhaust gas turbocharger, then compressed by a compressed air generator, and then fed into the decoupling gasification furnace as a gasification agent. The present application has the advantages that the present application can realize in-situ high-temperature catalytic cracking of tar, efficient utilization of waste heat, and stable operation of the system, thereby improving the power generation efficiency and reducing the equipment cost.

The invention discloses a process for converting biomass particles into synthesis gas by using pressurized bubbling fluidized bed equipment. The process comprises the following steps: feeding the biomass particles and fluidizing agent particles as raw materials into a gasification furnace; the gasification furnace comprises a fluidized bed area, a secondary gasification area and a post gasification area; a plurality of layers of gasification nozzles are designed in the gasification furnace, tar generated by biomass gasification can fully react in a high-temperature area of the gasification furnace, and synthesis gas generated by the pressurized bubbling fluidized bed gasification furnace enters a cyclone separator to be separated and then enters a synthesis gas cooler to be cooled; the cooled synthesis gas enters a synthesis gas filter, and the filtered synthesis gas enters a shock cooling system; the synthesis gas filtered by the synthesis gas filter enters a quench cooler of the quench system to be fully contacted with water for cooling and then enters a washing tower for washing, and the cooled and washed synthesis gas enters a downstream area; according to the invention, biomass ash fusion is reduced; and tar is reduced and eliminated.

The invention discloses a hydrogen-coupled green methanol production system and method, and a green methanol product is obtained through the procedures of gasification, purification, methanol synthesis, methanol rectification and the like. The hydrogen-coupled green methanol production system comprises a gas making unit, a purification unit, a methanol synthesis unit and a methanol rectification unit, the gas making unit is a biomass gasification unit, the biomass gasification unit comprises a normal-pressure circulating fluidized bed, the normal-pressure circulating fluidized bed gasifies a biomass raw material to generate crude synthesis gas, the purification unit is used for purifying the crude synthesis gas, and the methanol rectification unit is used for rectifying the crude synthesis gas. The hydrogen compression unit is connected in front of the methanol synthesis unit, the hydrogen compression unit is used for providing hydrogen, the methanol synthesis unit is used for synthesizing synthesis gas and hydrogen into crude methanol, and the methanol rectification unit is used for rectifying the crude methanol into refined methanol. The method can promote the resource utilization of biomass materials, achieves the purposes of energy conservation, emission reduction and environmental protection, meets the current requirements of environmental protection, energy conservation and low-carbon economy, and is beneficial to green and sustainable development.

The invention provides a coral reef-shaped bifunctional catalyst for preparing green hydrogen through biomass gasification and synchronously decarbonizing and a preparation method of the coral reef-shaped bifunctional catalyst, and belongs to the field of biomass high-value utilization. The activity and the stability of the catalyst are improved by regulating and controlling the mutual matching of the active phase and the carrier through the falling position of the active metal; the coral reef-shaped bifunctional catalyst is directionally constructed, and a confinement environment required by bond breaking and CO2 conversion is provided by utilizing the unique spatial configuration of the carrier. The catalyst utilizes a green hydrogen production active center to directionally break bonds in a thermochemical conversion process, so that the content of green hydrogen in synthesis gas is increased; cO2 in the synthesis gas is absorbed and converted by using a decarburization active center, and the content of CO2 at an outlet of the reactor is reduced. The bifunctional catalyst prepared by the invention has relatively high activity and cycling stability, two reaction processes (bond breaking, decarbonylation and water gas shift reaction) are coupled to realize preparation of high-H2 / CO (3.84) synthesis gas through biomass thermochemical conversion, and the application prospect is wide.

The invention provides a biomass gasification and new energy electrolysis hydrogen production coupled green alcohol production co-combustion system and method, and belongs to the technical field of coal power unit carbon reduction, and the system comprises a new energy power generation device used for generating electric energy; the water electrolysis hydrogen production device is used for generating H2 and O2 based on the water and the electric energy generated by the new energy power generation device; the biomass gasification device is used for gasifying biomass based on the air and O2 generated by the water electrolysis hydrogen production device to generate CO and H2; the methanol production device is used for generating methanol based on CO and H2 generated by the biomass gasification device and H2 generated by the water electrolysis hydrogen production device; and the hearth combustion device is used for carrying out blending combustion based on methanol generated by the methanol production device. According to the scheme, the carbon emission generated in the power generation process of the coal-fired power generation unit can be reduced.

The invention discloses a biomass gasification product distribution prediction method based on a hard constraint physical information neural network. The method comprises the following steps: collecting and preprocessing gasification experiment data; constructing a multi-layer artificial neural network model, and converting prior monotonicity knowledge into an inequality constraint combination only related to network parameters by adopting a hard constraint learning mode; model training: aiming at regression loss and regularization loss of experimental data, adopting a constrained particle swarm optimization algorithm to perform network parameter optimization on the model under an inequality constraint combination to obtain a hard constraint physical information neural network model; and predicting biomass gasification input data by adopting a hard constraint physical information neural network model to obtain a biomass gasification product distribution condition. According to the method, the monotonicity knowledge between the biomass gasification products and the key input parameters is embedded into the neural network model, the problem that biomass gasification experiment samples are insufficient can be effectively solved, and a more accurate and more interpretable biomass gasification product distribution result is obtained.

The utility model relates to a biomass gasification system which comprises a pressurized feeding unit, a fluidized bed gasification unit, a deslagging unit, an entrained-flow bed high-temperature cracking unit, a synthesis gas washing unit, a slag water unit and a gasifying agent conveying unit, the fluidized bed gasification unit comprises a fluidized bed gasification furnace and a high-temperature cyclone separator; the fluidized bed gasification furnace is connected with the pressurized feeding unit, the gasifying agent conveying unit, the high-temperature cyclone separator and the deslagging unit; the entrained-flow bed high-temperature cracking unit comprises an entrained-flow bed high-temperature cracking furnace, and the entrained-flow bed high-temperature cracking furnace is connected with a high-temperature cyclone separator, a gasifying agent conveying unit, a synthesis gas washing unit and a slag water unit. Compared with the prior art, the fluidized bed entrained-flow bed has the advantages of a fluidized bed and an entrained-flow bed, and has the characteristics of wide raw material applicability, high effective gas content, no tar, low energy consumption and the like.

The utility model discloses a system for preparing green methanol by biomass gasification coupling green hydrogen. The system comprises a gasification unit (A), a purification unit (B), a hydrogen and oxygen unit (C) and a synthesis unit (D), synthesis gas (104) generated by the gasification unit (A) is synthesized into raw material gas (107) after passing through the purification unit (B); oxygen (109) produced by the oxyhydrogen unit (C) is used as oxygen of the gasification unit, and hydrogen (113) produced by the oxyhydrogen unit (C) is used as a hydrogen source for adjusting the hydrogen-carbon ratio of raw material gas of the synthesis unit (D); part of purge gas (121) of the synthesis unit (D) is returned to the gasification unit for recycling. The system is stable and reliable in operation, high in renewable carbon source utilization rate and low in methanol preparation cost.

The invention provides a natural gas preparation system and method, and relates to the technical field of natural gas preparation, the natural gas preparation system comprises a biomass gasification device, a water electrolysis device and a methanation device, in the biomass gasification device, biomass is baked and smashed to form biomass powder, the biomass powder is conveyed to a gasification unit, and in the water electrolysis device, the biomass powder is conveyed to a methanation unit. The water is electrolyzed to form oxygen and hydrogen, the oxygen is conveyed to the gasification unit, the biomass powder and the oxygen react in the gasification unit to form synthesis gas, and the synthesis gas and the hydrogen are respectively conveyed into the methanation device and react in the methanation device to form natural gas. According to the natural gas preparation system, biomass can be used as a raw material, the technological process is simple, the problems of high preparation cost and public engineering consumption can be solved, redundant carbon dioxide cannot be generated in the natural gas preparation process, the concept of green and sustainable development is met, and the problem of low carbon element utilization rate is solved.

The invention discloses a preparation method of a composite red mud catalyst for synthesis gas tar cracking, which comprises the following steps: (1) drying red mud, grinding into powder, mixing the red mud powder obtained by grinding with an adhesive, and adding water and acid under a stirring condition to completely dissolve alkali metal in the red mud powder to obtain red mud particles; (2) grinding biomass pyrolysis semi-coke particles, and mixing the ground biomass pyrolysis semi-coke particles with the red mud particles obtained in the step (1) for 10-15 minutes to obtain red mud glue; (3) putting the red mud glue into a granulator, and carrying out red mud catalyst granulation according to the length-diameter ratio of 3 to 5, so as to obtain composite red mud particles; and (4) air-drying, drying and heating the composite red mud particles obtained in the step (3) to obtain the composite red mud catalyst. The catalyst can prevent the iron-based catalyst from being oxidized and inactivated under the high-temperature condition of the synthesis gas, and high-temperature biomass gasification tar catalytic cracking and efficient cleaning purification are achieved.