2078 results about "Biogas" patented technology

The invention relates to the technical field of sewage plant-oriented carbon neutralization regulation and control scheme design, in particular to a sewage plant-oriented carbon neutralization regulation and control method and a sewage plant-oriented carbon neutralization regulation and control system. The method comprises the steps of collecting water quality, energy consumption and gas emission data in real time through a multi-source sensor, inputting the data into a space-time diagram convolutional network to predict a carbon emission trend after edge computing node cleaning, and dynamically optimizing an aeration rate and a sludge reflux ratio based on a fuzzy PID controller. A whole-process carbon footprint is tracked by adopting a life cycle evaluation method, a multi-target compensation strategy is generated in combination with an improved NSGA-III algorithm, and photovoltaic, biogas and green power resources are scheduled preferentially. A digital twin platform and a block chain evidence storage module are innovatively integrated, the former calibrates model parameters in real time, and the latter generates a non-tampering carbon neutralization voucher. According to the method, the problems of one-sided data, regulation and control lag and insufficient credibility of a traditional method are solved, and minute-level sensing, prediction and offset closed-loop control of carbon emission in the sewage treatment process is realized.

An improved method and apparatus for removing acid gases and other impurities from raw biogas streams, such as biogas from landfills or biogas from controlled anaerobic digestion, is disclosed. The method provides efficient generation of high-purity renewable natural gas from raw biogas. The biogas is treated in a multi-stage membrane system integrated with compression equipment. The membrane separation units are arranged into interconnected high-pressure and low-pressure gas recycling loops powered by high-pressure and low-pressure compressors. The multi-stage membrane system can be integrated with deoxygenation and auxiliary nitrogen removal systems. The combined system provides for the generation of efficient contaminant removal from raw biogas to generate high-purity methane products with reduced compression energy consumption.

Disclosed herein are membrane-based gas separation methods and systems. The methods and systems may, in particular, be used for separating a feed stream comprising methane and carbon dioxide (such as for example a biogas feed stream) in order to provide a methane product stream (such as for example a biomethane stream).

An improved method and apparatus for removing acid gases and other impurities from raw biogas streams, such as biogas from landfills or biogas from controlled anaerobic digestion, is disclosed. The method provides efficient generation of high-purity renewable natural gas from raw biogas. The biogas is treated in a multi-stage membrane system integrated with compression equipment. The membrane separation stages are integrated with high-pressure and low-pressure compressors with the low-pressure compressor operating in a defined pressure range. The combined system provides for efficient contaminant removal from raw biogas to generate high-purity methane products with reduced membrane area and compression energy consumption.

The invention discloses a biogas internal combustion engine exhaust gas waste heat cascade reutilization heat energy recovery device which comprises an exhaust gas conveying pipeline, a heat exchange cavity is formed in the exhaust gas conveying pipeline, a plurality of tower-shaped spiral heat exchange pipelines are arranged in the heat exchange cavity, the multiple heat exchange pipelines are vertically and sequentially distributed, the heat exchange pipelines are corrugated pipelines, and the heat exchange pipelines are communicated with the heat exchange cavity. A power rod is arranged in the middle of the heat exchange pipeline; the vibration motor and the power rod are arranged in the waste gas conveying pipeline, so that the power rod can guide and transmit the driving force of the vibration motor to the tower-shaped spiral heat exchange pipeline capable of extending and contracting through the hard connecting structure or the soft connecting structure, and the heat exchange pipeline can shake up and down in the heat exchange operation period; and therefore, water flowing in the pipeline can be driven to roll up and down, the water flowing in the pipeline can be more sufficiently and uniformly attached to the inner wall of the heat exchange pipeline, the heating area of the pipeline is more uniform, and the overall heat exchange effect is effectively improved.

The invention belongs to the field of microbial electrochemistry and solid organic waste recycling, and discloses a microbial electrosynthesis enhanced solid wastewater hydrolysis and anaerobic digestion biogas high-value utilization system coupling microbial electrosynthesis, organic solid waste electrochemical-biological synergistic hydrolysis oxidation and anaerobic digestion. The system comprises a cathode chamber and an anode chamber which are separated by an ion exchange membrane, an electrochemical driving device and an anaerobic digestion unit communicated with the anode chamber. And the cathode chamber is provided with a cathode electrode and an anaerobic acetic acid production microbial system and is communicated with biogas generated by anaerobic digestion, so that carbon dioxide in the biogas is reduced at the cathode to generate acetic acid and methane-enriched gas is output. The anode chamber is provided with an anode electrode, organic solid waste and a hydrolytic microorganism system are added, electrochemical-biological synergistic hydrolytic oxidation of the organic solid waste and hydrolysates of the organic solid waste is used as an anode reaction, oxygen evolution is inhibited, and oxygen transmembrane migration is reduced; and the hydrolysate in the anode chamber flows into the anaerobic digestion unit to produce biogas, so that the integrated operation of solid wastewater hydrolysis and biogas upgrading is realized.

The invention discloses a landfill leachate anaerobic-denitrification treatment process and system based on waste molasses synergistic interaction, and belongs to the technical field of sewage treatment. The process comprises the following steps: (1) carrying out two-stage anaerobic digestion on the landfill leachate to remove organic matters and recover biogas, wherein first-stage anaerobic digestion adopts medium-temperature (35 + / -2 DEG C) anaerobic digestion, and second-stage anaerobic digestion adopts high-temperature (55 + / -1 DEG C) anaerobic digestion; (2) removing impurities from the waste molasses, diluting the waste molasses, mixing the diluted waste molasses with activated sludge, fermenting under an anaerobic condition to generate fermentation liquor rich in volatile fatty acid, and adding the fermentation liquor into a denitrification reactor; and (3) constructing an anaerobic-denitrification synergistic system, and increasing the denitrification rate by using the charcoal-loaded nano zero-valent iron (nZVI at BC) as an electronic mediator. According to the method, resource utilization of the waste molasses is realized, the problem of imbalance of the carbon nitrogen ratio of the landfill leachate is solved, anaerobic digestion and nitrification and denitrification processes are coupled, efficient nitrogen removal and organic matter removal are realized, and meanwhile, the sludge yield and the operation cost are reduced.

The present disclosure relates to a carbon dioxide capture apparatus and process combined with biogas upgrading, and there is provided the carbon dioxide capture apparatus combined with biogas upgrading for simultaneously obtaining high purity methane and carbon dioxide, and improving separation efficiency without an additional process by making use of gas streams after a liquefaction process, and recovering cold heat in the process.

A system for separating a gas mixture is provided. The system includes a source of a gas mixture and a membrane separation stage including a gas separation membrane module. The membrane separation stage is in fluid communication with the source of the gas mixture, and the gas separation membrane module is configured to separate the gas mixture into a retentate stream and a permeate stream. The gas separation membrane module also includes a membrane having a permeate side and a retentate side. A sweep stream is provided to the permeate side of the membrane, the sweep stream comprising a portion of the retentate stream.

A process and / or system for producing fuel using renewable hydrogen having a reduced carbon intensity. The renewable hydrogen is produced in a hydrogen production process comprising methane reforming, wherein at least a portion of the feedstock for the hydrogen production process comprises upgraded biogas sourced from a plurality of biogas plants. Each of the upgraded biogases is produced in a process that includes collecting biogas comprising methane and carbon dioxide, capturing at least 50% of the carbon dioxide originally present in the collected biogas and producing the upgraded biogas. Storage of the captured carbon dioxide reducing a carbon intensity of the fuel, without having to provide carbon capture and storage of carbon dioxide from hydrogen production.

The invention relates to the technical field of garbage treatment, in particular to a garbage low-carbon coupling treatment system and method.The method comprises the following steps that large wet materials and organic waste residues are separated from kitchen garbage, and the large wet materials are dried and put into a garbage incinerator to be combusted to release heat; fermenting the organic waste residues to obtain biogas which is used for burning and heating methanol liquid to generate methanol steam, mixing the methanol steam with water vapor, and performing catalytic hydrogen production to obtain mixed gas; the sludge is dried, a part of the dried sludge is put into a biomass gasifier to be subjected to coupled gasification with biomass waste to generate biomass gas, and the rest of the dried sludge is put into a garbage incinerator to be combusted together; and the mixed gas obtained through catalytic hydrogen production is separated, hydrogen and other combustible gas are obtained, and the biomass gas and the other combustible gas are fed into a garbage incinerator to be combusted together. According to the scheme, kitchen waste, sludge and biomass waste can be subjected to coupling treatment, and hydrogen is prepared.

An improved method and apparatus for removing acid gases and other impurities from raw biogas streams, such as biogas from landfills or biogas from controlled anaerobic digestion, is disclosed. The method provides efficient generation of high-purity renewable natural gas from raw biogas. The biogas is treated in a multi-stage membrane system integrated with compression equipment. The membrane separation units are arranged into interconnected high-pressure and low-pressure gas recycling loops powered by high-pressure and low-pressure compressors. The multi-stage membrane system can be integrated with deoxygenation and auxiliary nitrogen removal systems. The combined system provides for the generation of efficient contaminant removal from raw biogas to generate high-purity methane products with reduced compression energy consumption.

The invention discloses a metal-doped modified zeolite molecular sieve adsorbent as well as a preparation method and application thereof. The metal-doped modified zeolite molecular sieve adsorbent comprises a carrier and an active metal component loaded on the carrier, the carrier is a mordenite molecular sieve; the active metal components comprise at least two of Ca, Mg, Ti, Fe, Ni, Co, Cu, Zn, Na and Ag; in the adsorbent, the loading capacity of the active metal component is 0.1%-15%. The adsorbent provided by the invention has good separation performance on CH4 / CO2, CH4 / N2, CO2 / N2 and CH4 / CO2 / N2 mixed gas separation systems, has the advantages of simple synthesis method, strong hydrothermal stability, high selectivity and the like, and can meet the requirements of CH4 purification in unconventional natural gas such as landfill gas, sewage treatment methane gas, agricultural and breeding biogas, coal bed gas, shale gas and shallow biogas, and the like. And the requirements of high-concentration natural gas denitrification, CO2 capture and other scenes can be met.

The invention discloses an anaerobic fermentation soft measurement modeling method based on TSSA-CNN-LSTM. The method is used for accurately predicting the biogas concentration which is difficult to directly measure in the anaerobic fermentation process. Comprising the following steps: 1) after data acquisition, using a convolutional neural network (CNN) algorithm to screen sampling data of an anaerobic fermentation process with a time tag sequence obtained through field operation or experiments; 2) establishing a CNN-LSTM soft measurement model for an anaerobic fermentation process, and optimizing hyper-parameters of the CNN-LSTM model by using a chaos sparrow optimization algorithm (TSSA); and 3) inputting the characteristic variables into a TSSA-CNN-LSTM soft measurement model for modeling. The modeling method provided by the invention has the advantages of good estimation performance, high accuracy and strong generalization ability, and is also suitable for soft measurement modeling in other complex chemical reaction processes.

The invention relates to the technical field of fuel gas mixing, and discloses a biological natural gas mixing control method and system.The method comprises the steps that a natural gas branch, a synthesis gas branch and a mixed gas outlet are each provided with a multi-mode sensor unit; carrying out data fusion on the detection data and the detection data of an on-line chromatographic instrument and a mixed gas rapid calorific value instrument, and estimating the low calorific value, the bloom index and the gas component percentage of the mixed gas in real time based on a constraint model and Kalman filtering; establishing a prediction controller, setting input to predict gas characteristics required by a future gas turbine, and outputting a synthesis gas valve opening degree and a natural gas valve fine tuning signal; calculating an allowable mixing proportion upper limit to form a dynamic mixing window, and adjusting the mixing proportion of the natural gas and the synthesis gas based on the dynamic mixing window when a hard boundary condition is met; and when the instability state occurs, the safety interlocking is triggered. According to the invention, rapid detection is realized, active adjustment of rapid working condition fluctuation is realized, and safety interlocking is arranged, so that the overall operation safety is improved.

The invention discloses modified biogas residue-based hydrothermal carbon, a preparation method thereof and a dry digestion method for kitchen waste, and belongs to the technical field of waste organic matter recycling. The preparation method comprises the following steps: soaking biogas residues in a phosphoric acid solution to obtain pretreated biogas residues; mixing the pretreated biogas residues, transition metal salt, biochar loaded with vitamin B12 and water with the mass being 8-15 times that of the pretreated biogas residues, and performing hydrothermal reaction for 1-4 hours under the conditions that the temperature is 180-250 DEG C and the pressure is 1.5-4 MPa to obtain a hydrothermal product; and activating the hydrothermal product for 1-2 hours under the protective atmosphere of 300-400 DEG C to obtain the modified biogas residue-based hydrothermal carbon. The surface Fe-Cu composite oxide sequentially catalyzes and oxidizes H2S into elemental sulfur and sulfate ions, the vitamin B12-loaded biochar can promote MA directional proliferation, the sulfate ions can competitively inhibit SRB substrate uptake, the quantity ratio of MA to SRB is increased, and the methane production efficiency is effectively improved.

The utility model discloses a novel IC anaerobic tower top structure, and belongs to the technical field of sewage treatment equipment. The top structure comprises a tower body and a tower top arranged on the tower body, and further comprises a biogas chamber arranged on the tower top and communicated with an exhaust pipe arranged on the tower top; and a gas inlet pipe is arranged on the biogas chamber corresponding to the tower top. The top structure of the anaerobic tower is in a totally closed form, so that methane in the tower can be completely prevented from escaping outwards, and the methane generated by reaction in the tower body can be completely collected; the top structure is completely closed, so that air can be prevented from entering the tower from the tower top; no external air enters, so that the possibility of electrochemical corrosion of a steam-water interface in the tower is greatly reduced, the service life of the tower body is greatly prolonged, and accidents are reduced; in addition, due to the completely-closed tower top structure, odor generated by reaction in the tower body can be completely prevented from overflowing, and pollution to the environment and influence on human health are reduced; the biogas chamber is arranged at the top of the tower to improve the space utilization rate.

The invention discloses a gas separation mixed matrix membrane and a preparation method thereof, and belongs to the technical field of gas membrane separation. The mixed matrix membrane comprises a high polymer material matrix and a porous material, and through hydrogen-bond interaction formed by the high polymer material matrix and the porous material, the interfacial compatibility between a filler and the polymer matrix and the dispersity of the filler are remarkably enhanced; the pore material is used as a pore structure regulator, improves the chain accumulation mode of a polymer matrix and provides a selective gas separation window, and the gas screening capacity of the membrane is remarkably improved through the synergistic effect of the pore material and the pore structure regulator. The mixed matrix membrane is prepared by adopting a solution pouring method, the process is simple, the repeatability is high, large-area preparation is easy, the cost is low, the method is suitable for the fields of helium separation, hydrogen purification, natural gas purification, biogas purification and carbon capture, and the application prospect is wide.

The application discloses a method for efficient denitrification and decarburization of kitchen waste and sludge co-fermentation anaerobic digestion effluent, which removes part of COD and ammonia nitrogen in the influent sludge by using a first SNAD, and maintains a certain amount of free ammonia of a certain concentration due to the high concentration of ammonia nitrogen and the high pH of the influent, so as to maintain the inhibition effect on nitrifying bacteria and ensure the conversion of part of the ammonia nitrogen into nitrite nitrogen, and the high activity of anaerobic ammonia oxidation bacteria is ensured in the first SNAD by limiting the aeration amount, so that the ammonia nitrogen and nitrite can be further removed; the effluent enters a nitrification tank, and the ammonia nitrogen is nitrified into nitrate nitrogen under the condition of nitrifying bacteria and sufficient aeration amount, and then enters a denitrification tank, and the denitrification process is carried out under the condition of heterotrophic denitrifying bacteria and sufficient carbon source, so that most of the nitrate nitrogen in the system is converted into nitrogen gas and removed, finally, the clear liquid is discharged after being filtered by an MBR membrane in a membrane tank, so as to achieve the purpose of efficient denitrification and decarburization of kitchen waste anaerobic digestion effluent.

The invention relates to the technical field of comprehensive energy system optimization scheduling, in particular to an energy-carbon excitation-based farm comprehensive energy system optimization scheduling method, which comprises the following steps: S1, constructing a comprehensive energy system covering an energy operator and farm users, providing electric heating energy by the operator, and supplying heat by the farm users through biogas power generation, the three types of loads are combined to construct an equipment and load model; s2, carbon potential is calculated based on a carbon emission flow theory, an energy-carbon price is formulated, and a stepped carbon transaction and segmented subsidy mechanism is adopted to stimulate a user to use low-carbon energy; s3, constructing a master-slave game model, performing upper-layer pricing excitation and lower-layer optimization response, and performing joint iterative solution by adopting a genetic algorithm and GUROBI; according to the invention, by constructing a master-slave game scheduling framework and introducing an energy-carbon joint pricing and stepped carbon excitation mechanism, collaborative optimization of system economy and a low-carbon target is realized, and user response enthusiasm and carbon emission reduction potential are effectively improved.

The invention relates to the technical field of acid soil treatment and improvement, in particular to a soil conditioner suitable for acid yellow red soil and a soil improvement method. The soil conditioner provided by the invention is prepared from the following components in percentage by weight: 10 to 20 percent of humic acid loaded biochar, 40 to 50 percent of modified organic fertilizer, 15 to 25 percent of biogas residue, 8 to 12 percent of oyster shell powder, 3 to 5 percent of functional microbial agent and 2 to 3 percent of water-retaining agent. The soil conditioner disclosed by the invention can better improve acid soil, and meanwhile, compared with traditional lime, the soil conditioner disclosed by the invention has longer duration time.

The invention discloses an anaerobic fermentation tank for livestock and poultry breeding mixed liquid dung, and belongs to the technical field of livestock and poultry waste treatment and utilization. The device is structurally provided with a steel tank body, a water inlet, an exhaust port, a water outlet, a heat exchange pipe, a slag discharge port and a pressure gauge. The water inlet, the exhaust port, the drainage port and the pressure indicator are arranged at the upper end of the tank body; the deslagging port and the heat exchange pipe are arranged at the lower end of the tank body; the interior of the tank body is divided into a plurality of independent cabins by isolation baffles, and the adjacent cabins are sequentially connected in series through cabin flow guiding openings and cabin slag discharging openings. Each cabin is divided into a plurality of small chambers by flow guide plates, and the adjacent small chambers are sequentially connected in series through small chamber exhaust holes and small chamber slag discharge holes. The heat exchange pipe is arranged at the bottom upper part of the tank body and annularly penetrates through the cabins; and the slag discharge port is arranged at the bottom of the serial tail cabin. According to the invention, the energy-consumption-free repeated settling separation of suspended matters in the liquid dung is fully realized, the solid / liquid separation efficiency of the liquid dung is improved, the methane content in unit liquid dung is high, the concentration of suspended matters in biogas slurry is low, the biogas residue is less, the problems of surface crusting, pipeline blockage and the like are avoided during long-term operation of equipment, and the operation and maintenance cost is low.

A process for stabilizing nutrients in anaerobic digestate involves removing hydrogen sulfide and ammonia from biogas. This process involves circulating the digestate in a column and contacting it with the biogas. Additional ammonium bisulfite, ammonia, and / or sulfur dioxide may be added to the contacting device to remove hydrogen sulfide from the biogas. The reactions will create ammonium bisulfite, ammonium sulfite, and ammonium thiosulfate to prevent ammonia and hydrogen sulfide emissions to allow for land application.

The invention discloses a multi-time-scale layered regulation and control method for a combined heat and power generation system considering light-storage-biomass collaboration, belongs to the technical field of power distribution network collaboration, and comprises the following steps: establishing a light-storage-biomass collaboration combined heat and power generation system model, and constructing cross-time-period energy storage constraints of a biogas digester biomass energy storage model and an energy storage battery model; a day-ahead-day-intra-day two-stage multi-time-scale layered regulation and control framework of a light-storage-biomass collaborative combined heat and power generation system is established, the comprehensive power utilization cost of the CHP system is minimized in the day-ahead stage of the upper layer, and the power deviation of photovoltaic power generation is reduced in the day-intra model of the lower layer; an intra-day rolling correction method based on model predictive control is provided, a light-storage-biomass collaborative combined heat and power generation system model is converted into a state-space equation, and dynamic compensation is performed by adopting short-time scale predictive information according to the predictive deviation of photovoltaic output and load demand in actual operation, so that the predictive deviation of the photovoltaic output and the load demand in actual operation is corrected. The problems that renewable energy is difficult to fully consume and the power of the power distribution network fluctuates are effectively solved.

The invention provides a microbial agent for producing acid through fermentation of organic waste and application of the microbial agent, and relates to the technical field of biology, the microbial agent contains Acetobacter xylinum, Clostridium bovifaecis and Eubacter mucilaginosus, and the microbial agent is prepared from the following raw materials: Acetobacter xylinum, Clostridium bovifaecis and Eubacter mucilaginosus. Studies find that acetobacter burgii, clostridium cow dung and eubacterium mucilaginosus complement each other in the anaerobic fermentation process, the degradation efficiency of organic matters such as carbohydrates and proteins in the organic wastewater / perishable garbage is improved, the yield of volatile fatty acids is remarkably increased, meanwhile, the emission of CO2 is reduced, and the environmental pollution is reduced. The method has the application prospects of organic wastewater / perishable garbage treatment and recycling. When the acid-producing bacterium agent is applied to organic wastewater / perishable garbage, the fermented mixed acid liquid is rich in VFA and can be used as an organic carbon source, and the additional value is higher; when the acid-producing bacterium agent is applied to organic wastewater / perishable garbage, the operation is simple and convenient, the cost is low, biogas slurry treatment links and cost are reduced, the added value of products can be improved, and the acid-producing bacterium agent has an engineering application prospect.

The utility model relates to the technical field of organic fertilizer fertilization, and particularly discloses an organic fertilizer fertilization system and a fertilization method, the organic fertilizer fertilization system comprises a differential pressure centrifugal filtering device, the differential pressure centrifugal filtering device comprises a device body, a centrifugal rotating disc is rotatably arranged in the device body, and a plurality of small filtering holes are formed in the middle of the side wall of the centrifugal rotating disc; a refined filtration liquid storage chamber and a slag liquid storage chamber are arranged in the device body; the bottom section cutting surfaces of the refined filtration liquid storage chamber and the slag liquid storage chamber are arranged in a manner that the middle parts are convex; the centrifugal turntable sequentially penetrates through the middle parts of the refined filtration liquid storage chamber and the slag liquid storage chamber; and a feeding pipe is arranged above the centrifugal turntable. The device has the beneficial effects of low energy consumption, high filtering efficiency, capability of meeting the requirement of applying biogas slurry to a drip irrigation system after treatment and the like.

The invention belongs to the technical field of hydrogen production processes, and discloses a bimetallic three-bed chemical looping hydrogen production method, which adopts a novel bimetallic oxygen carrier to replace Fe2O3 in a traditional three-bed system, thereby breaking through the limitation of traditional thermodynamics and maximally improving the hydrogen production efficiency under the condition that the carbon capture rate is not changed. According to the system, hydrogen is produced by using a redox pair of Fe3O4-FeO / Fe, and energy is provided for the system by using a redox pair of NiO-Ni, Mn3O4-MnO or Cu2O-Cu. By means of the method, energy distribution between the combustion process and the reforming process can be effectively controlled. The thermodynamic limitation is broken through by replacing a single iron-based oxygen carrier with the bimetallic oxygen carrier, and the carbon dioxide is captured in situ while the hydrogen production efficiency is improved. In addition, the bimetal oxygen carrier can also be used for research on hydrogen production from methane, biogas and other fuel gases, and the increasing requirement for clean hydrogen is met.

The invention discloses a membrane bio-membrane reactor and a method for efficiently coupling biogas recycling and denitrification by using the same, and relates to a reactor and a method for recycling and denitrifying biogas by using the same. The invention aims to solve the technical bottleneck problems that the traditional denitrification process depends on an external carbon source and is high in cost, and the existing methane-based membrane bio-membrane reactor cannot fully utilize biogas resources. The invention discloses a membrane bio-membrane reactor. Comprising a biogas high-pressure gas cylinder, a high-pressure gas pressure reducing valve, a reactor main body, a hollow fiber membrane assembly, a reactor main body water outlet, a reactor main body water inlet, a water inlet device, a reflux device, a circulating water outlet, a circulating water inlet, a gas sampling port, a reflux device water outlet, a liquid sampling port, a pH measuring instrument, a water outlet liquid sealing device and an atmosphere communication port. The mechanism of'one source and two purposes' (serving as an electron donor and converting into a carbon source in situ) of biogas methane is the core of realizing efficient denitrification and biogas resource utilization.

The invention discloses a method for preparing synthesis gas through methane chemical chain reforming. According to the method, an iron-based oxygen carrier is cyclically operated in a system comprising a reduction reactor, a reforming reactor and an air reactor. Comprising the following steps: reacting a complete iron oxide-based oxygen carrier regenerated in an air reactor with a part of synthesis gas generated by a reforming reactor in a reduction reactor to generate a gas mixture of water and carbon dioxide and a part of reduced iron-based oxygen carrier; the partially reduced iron-based oxygen carrier is introduced into a reforming reactor and reacts with biogas for reforming and deep reduction of the oxygen carrier, and a target product synthesis gas and the deeply reduced iron-based oxygen carrier are generated; and finally, introducing the deeply reduced iron-based oxygen carrier into an air reactor, reacting with air to regenerate a completely oxidized iron-based oxygen carrier, circulating the completely oxidized iron-based oxygen carrier to the reduction reactor for use, and generating oxygen-deficient air at the same time. According to the invention, through redox cycle of the iron-based oxygen carrier, biogas and air are used as raw materials, and efficient conversion from biogas to high-quality synthesis gas is realized.