35 results about "Fluidized bed gasifier" patented technology

The invention discloses a preparation method and application of a wind cap of a circulating fluidized bed gasifier, the wind cap is arranged at the bottom of a gasifier body, the wind cap mainly comprises a wind cap gas inlet, a wind cap gas outlet and a wind cap gas flow channel, and the wind cap gas flow channel is composed of a Tesla valve fluid channel. The air cap is prepared from modified fly ash through a combined method of freezing ball-milling nano modification, 3D printing coupling microwave-assisted sintering and salt bath chromizing strengthening. According to the method, a large amount of solid waste of fly ash can be consumed to realize carbon emission reduction, the efficiency of the circulating fluidized bed can be improved through structural optimization, meanwhile, the preparation cost of the hood can be reduced, and the method has relatively high application and popularization values.

The utility model discloses a biomass fluidized bed gasification furnace heat supply coupling internal combustion engine power generation system. A biomass gasification furnace utilizes biomass raw materials to produce combustible gas; the internal combustion generator set generates power by taking combustible gas as a gas source, the working time of the internal combustion generator set is concentrated on the peak-flat section of the power grid electricity price, and the electric energy generated by the internal combustion generator set is supplied to the power grid; the biomass gas steam boiler receives combustible gas and burns the combustible gas to generate heat, steam heat energy generated by the biomass gas steam boiler is supplied to the user side, and the working time period of the biomass gas steam boiler is concentrated in the valley period of the power grid electricity price. Both the biomass gas steam boiler and the internal combustion generator set receive combustible gas produced by the biomass gasification furnace through gas pipelines, and the gas pipelines are provided with electric control valves for controlling the gas supply states of the internal combustion generator set and the biomass gas steam boiler. The comprehensive energy consumption cost can be reduced, the energy utilization efficiency is improved, and meanwhile, remarkable environmental benefits are achieved.

A method and a process arrangement for producing hydrocarbons from plastic-based raw material by a gasification in an integrated process The integrated process includes a gasification unit for forming a gasification product, a steam cracking unit for forming a cracking product and a recovery unit for recovering hydrocarbons. The plastic-based raw material is gasified with steam in the gasification unit having at least one fluidized bed gasifier and the gasification product is formed, the gasification product is cooled at least partly for slowing and / or stopping the chemical reactions after the gasification, The gasification product is supplied to a quench tower of the gasification unit in which the gasification product is treated and condensable components are removed from the gasification product forming a treated gasification product, and the treated gasification product and the cracking product of the steam cracking unit are supplied to the recovery unit for separating and recovering hydrocarbons.

The invention provides a system and method for coupling garbage grading pyrolysis gasification with a pulverized coal boiler. A solid substance inlet of a drying kiln is used for introducing household garbage for drying; a solid substance outlet of the drying kiln communicates with a solid substance inlet of the pyrolysis kiln and is used for performing pyrolysis treatment on the dried household garbage to obtain pyrolysis oil gas and garbage carbon; a pyrolysis substance outlet of the pyrolysis kiln is communicated with a gasified substance inlet of the fluidized bed gasification furnace and is used for carrying out gasification treatment on pyrolysis oil gas and garbage carbon to obtain combustible gas, a combustible gas outlet of the fluidized bed gasification furnace is communicated with a hearth of the coal-fired boiler for combustion power generation, and a flue gas outlet of the coal-fired boiler is communicated with an inlet of the flue gas treatment system. The garbage grading pyrolysis gasification system and the coal-fired power generation unit are deeply coupled, efficient garbage cleaning treatment and resource utilization are achieved, the energy utilization rate is increased, and pollutant emission is reduced.

This utility model discloses a fluidized bed gasification system, which includes a fluidized bed gasifier and a cooling device, a first dust removal device, and a cooling and scrubbing device connected in series at the syngas outlet of the fluidized bed gasifier. The cooling device is used to cool the syngas flowing out of the syngas outlet of the fluidized bed gasifier. The first dust removal device is used to collect fly ash from the syngas flowing out of the cooling device. The cooling and scrubbing device is used to wash the fly ash from the syngas flowing out of the first dust removal device. Based on the fluidized bed gasification system of this utility model, the resulting net syngas has a high CO content, low H2 and CO2 content, small wastewater and circulating water volume, low syngas dew point, and low heat loss from the gasifier.

This utility model discloses a circulating fluidized bed gasifier, a CO2-captured cement production line, and a gypsum decomposition system. The cement production line, by modifying the decomposition furnace structure and adding a circulating feed pipe, a jacketed circulating fluidized bed gasifier, and a green hydrogen system, achieves high-concentration carbon dioxide capture and alternative fuel recycling. The industrial by-product gypsum decomposition system uses an electromagnetically heated decomposition furnace, gasification coupling, and a green hydrogen system for power supply, achieving co-production of sulfuric acid and lime with low carbon emissions. Both the cement production line and the industrial by-product gypsum decomposition system convert carbon dioxide into combustible gas for their own combustion through a jacketed circulating fluidized bed gasifier, combined with green electricity-to-hydrogen technology, completely solving the problems of fuel cost and carbon emissions. This system features high capture efficiency, low energy consumption, and compact equipment, making it suitable for large-scale industrial applications.

The utility model discloses a cooling device for a biomass pressurized fluidized bed gasifier inlet, which comprises a clamping flange forge piece, a jacket outer pipe, a jacket core pipe and a jacket inner pipe, the jacket outer pipe and the jacket inner pipe are coaxially arranged, the jacket inner pipe is positioned in the jacket outer pipe, the jacket core pipe is arranged between the jacket outer pipe and the jacket inner pipe, and the jacket inner pipe is positioned in the jacket outer pipe. A first cooling liquid flow channel is formed between the jacket outer pipe and the jacket core pipe, a second cooling liquid flow channel is formed between the jacket inner pipe and the jacket core pipe, the same ends of the jacket outer pipe, the jacket core pipe and the jacket inner pipe are fixedly connected with the clamping flange forge piece, and the other ends of the jacket outer pipe and the jacket inner pipe are fixed on the sealing plate. The cooling device disclosed by the utility model can be used as an extension part of the screw rod cooling jacket of the screw conveyer towards the inside of the gasification furnace, so that the temperature at the inlet of the biomass gasification furnace can be effectively reduced, the material selection range is favorably increased, and the total cost is reduced.

The invention relates to the technical field of biomass energy utilization and metallurgical reduction, in particular to a system and a method for coupling multi-stage grading biomass gasification with iron ore powder reduction, which comprises a multi-stage grading fluidized bed gasifier connected with a waste heat boiler through a pipeline, the waste heat boiler is connected with the reduction reactor through a pipeline, the lower end of the reduction reactor is connected with the product tank through a pipeline, the upper end of the reduction reactor is connected with the external cyclone separator through a pipeline, and the external cyclone separator is connected with the water scrubbing tower through a pipeline. The lower end of the external cyclone separator is connected with a material returning device through a pipeline, the material returning device is connected with the reduction reactor through a pipeline, the equipment has high integration, the technological process is compact and efficient, the carbon emission is low, the efficient gasification technology and the fluidized bed reduction technology are organically coupled, the whole technological process does not need to depend on coke, and the energy consumption is low. And the external carbon emission is extremely low.

The utility model discloses a high-temperature spiral conveyer for a biomass pressurized fluidized bed gasifier, which comprises a shell, a spiral blade arranged in the shell, a motor fixed at one end of the shell and connected with the spiral blade, and a self-balancing component, and the self-balancing component comprises a multi-connecting-rod component and a configuration block, one end of the multi-connecting-rod component is fixedly hinged to the shell, the other end of the multi-connecting-rod component is hinged to the shell and can move in the axial direction of the shell, and the configuration block is connected to the movable end of the multi-connecting-rod component. The self-balancing assembly is connected to the shell and comprises the multi-connecting-rod component and the balancing weight, when one end of the shell is likely to expand and deform, deformation force is transmitted to the multi-connecting-rod component, and therefore the other end of the multi-connecting-rod component ascends or descends synchronously. The force acting on the inlet end and the outlet end is also uniformly distributed, so that the situation that the high-temperature spiral conveyor for the biomass pressurized fluidized bed gasification furnace is torn due to overlarge stress at the pipe orifice, and further leakage is caused is avoided.

Systems and methods are provided for solid gasification that incorporates at least two reactors. The first reactor may include a fluidized bed gasifier for solids conversion into synthesis gas (i.e., syngas), methane (CH4), tar, and char. The gasified products are passed through at least one cyclone filter. Dipleg effluent including at least a portion of the char is passed into a first zone of the second reactor, which comprises a multi-zone thermal reformer.

The application relates to the technical field of SAF preparation, in particular to a biomass gasification SAF preparation process and device, which comprises a gasification furnace, a condensing device, an SAF synthesizing device, a hydrogenation isomerization device, an SAF separating device, an electrolytic water device and a waste heat power generation device. The method produces synthesis gas by gasifying biomass particles through a double-flow fluidized bed gasification furnace, produces hydrogen and oxygen by driving an electrolytic water hydrogen production device through renewable energy, provides oxygen to the gasification furnace, generates crude SAF by one-step F-T reaction of the synthesis gas and the hydrogen, and generates qualified SAF and biodiesel by hydrogenation isomerization and separation. The hydrogen produced by electrolytic water can be liquefied and stored through a liquid hydrogen device, hydrogen is supplemented according to the renewable energy condition, and the stability of hydrogen supply is adjusted. The method has the characteristics of simple process flow, low device operation energy consumption, good economy and the like, and has the advantages of liquid hydrogen energy storage and renewable energy fluctuation adaptation.

The application discloses a sludge flash drying system integrated with a fluidized bed gasification furnace, which comprises a wet sludge conveying subsystem, an outlet of the wet sludge conveying subsystem is communicated with an inlet of a sludge flash drying subsystem, an outlet of the sludge flash drying subsystem is connected with an inlet of a gas-solid separator, an outlet of the gas-solid separator is communicated with an inlet of a dry sludge conveying subsystem, an outlet of the dry sludge conveying subsystem is communicated with an inlet of a fluidized bed gasification furnace subsystem, an outlet of the fluidized bed gasification furnace subsystem is communicated with a gas-gas heat exchanger, an outlet of the gas-gas heat exchanger is communicated with an inlet of an external combustion chamber, and an outlet of the external combustion chamber is communicated with a drying gas inlet of the sludge flash drying subsystem. The application recycles the heat value generated in the sludge gasification process for sludge flash drying, so that the energy consumption is low, and the economic cost of system operation is reduced. Due to the high sludge drying efficiency and the strong sludge disposal capacity, the resourceization, reduction and efficient clean utilization of sludge can be realized.

This invention relates to a method and apparatus for the gasification, deoiling, and roasting of oil-containing waste catalysts in the field of hazardous waste disposal and utilization technology. The apparatus includes a fluidized bed gasifier, a secondary combustion chamber, a rotary kiln, an ignition burner, a supplementary combustion burner, a deoiled material conveying device, a mixing and feeding device, a waste heat boiler, an air preheating device, a blower, a quench tower, a dust collector, a deacidification tower, a flue gas reheater, an induced draft fan, a chimney, and a flue gas recirculation fan. This invention belongs to a pyrometallurgical process for the disposal and utilization of oil-containing waste catalysts. Through the method described in this invention, oil-containing waste catalysts are deoiled in a fluidized bed gasifier to produce combustible gas and deoiled material. The heat generated after the combustible gas is fully combusted in the secondary combustion chamber enters the rotary kiln to roast the mixture of the deoiled material and alkaline materials, generating sodium-based material. The subsequent treatment process of the sodium-based material discharged from the rotary kiln is not within the scope of this invention. The flue gas discharged from the rotary kiln undergoes purification treatment such as dust removal and acid removal in subsequent flue gas treatment processes, thereby achieving ultra-low emission standards. This invention achieves efficient recovery and utilization of precious metals from waste catalysts using a low-cost, low-energy pyrometallurgical process.

The utility model discloses a Zhundong coal fluidized bed-entrained-flow bed two-section type grading gasification system. Relates to the technical field of coal chemical industry. A fluidized bed gasifier is provided with a fluidized bed coal feeding port, and the bottom of the fluidized bed gasifier is provided with a slag discharging pipe; the first-stage cyclone separator is communicated with the fluidized bed gasification furnace, and the first-stage cyclone separator is communicated with the second-stage cyclone separator; the fly ash storage tank is communicated with the secondary cyclone separator; a nitrogen inlet and a nitrogen outlet are formed in the fly ash storage tank; a high-temperature coal gas chiller is arranged at the top of the entrained-flow bed gasification furnace, an entrained-flow bed high-temperature nozzle is arranged on the entrained-flow bed gasification furnace, and the entrained-flow bed high-temperature nozzle is communicated with a fly ash storage tank; a gasification fan is arranged on the treatment assembly, the treatment assembly is communicated with the fluidized bed gasification furnace, the treatment assembly is sequentially communicated with a bag-type dust collector, a coal gas cooler and a chilling fan, and the chilling fan is communicated with a high-temperature coal gas chiller. The coal grading conversion device can realize coal grading conversion, save system energy consumption, eliminate fly ash and improve system carbon conversion rate.

This invention discloses a coal catalytic gasification system, comprising a fluidized bed gasification system, a slag tank, and an underground gasifier. The slag discharge port of the fluidized bed gasifier and the discharge port of the dust removal device of the fluidized bed gasification system are both connected to the inlet of the slag tank. The discharge port of the slag tank is connected to the air inlet of the underground gasifier. The air outlet of the underground gasifier is connected to the air inlet of the dust removal device via a pipeline. The advantages are: combining the fluidized bed gasifier and the underground gasifier allows the solids in the crude coal gas products obtained from both gasifiers to be returned to the slag tank, and combined with the ash and slag discharged from the bottom of the fluidized bed gasifier, which is then transported to the underground gasifier, reducing ash and slag emissions from the fluidized bed gasifier and minimizing environmental pollution; simultaneously, the low-cost catalyst in the ash and slag of the catalytic gasifier plays a further catalytic role in the underground gasifier, increasing the reaction intensity and maximizing the utilization of the low-cost catalyst.

The invention relates to a biomass gasification system and a gasification method. The gasification system 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 gasification 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 invention couples the advantages of the fluidized bed and the entrained-flow bed, and has the characteristics of wide raw material applicability, high effective gas content, no tar, low energy consumption and the like.

This disclosure relates to the field of coal chemical technology, and provides a raw material pretreatment method and system for a fluidized bed gasifier. The raw material pretreatment method for the fluidized bed gasifier involves pre-crushing the raw coal and / or solid waste to obtain pulverized coal, thereby increasing the contact area; the pulverized coal is then fed into a pretreatment unit for further crushing, water removal, and reduction of oxygen-containing functional groups to obtain pulverized coal, improving its hydrophobicity and giving it good slurry-forming properties; the pulverized coal is then fed into a washing unit for washing to remove water-soluble cations, obtaining wet pulverized coal, thus preventing cations from affecting the flowability of the coal-water slurry produced from the pulverized coal; the wet pulverized coal is then fed into a slurry preparation unit to obtain coal-water slurry. This multi-step treatment process allows for the production of coal-water slurry that meets technical parameters from inexpensive but low-quality raw coal and / or inexpensive solid waste, broadening the range of raw material selection for coal-water slurry gasification and reducing the cost of the coal-water slurry gasification process.

The invention relates to a fluidized bed gasification system and a control method. The fluidized bed gasification system comprises a conveying tank, a conveying pipeline, a gasification furnace and a control assembly, the conveying tank is provided with an ash outlet, the gasification furnace is provided with an ash return opening, and the ash outlet and the ash return opening are connected through the conveying pipeline; the conveying tank is used for conveying fly ash to the gasification furnace; an accelerator and a control valve are arranged on the conveying pipeline; the accelerator is sequentially and coaxially provided with a pressure-bearing pipeline layer, a ventilation layer and a supporting framework layer from outside to inside, and the pressure-bearing pipeline layer is connected with a gas conveying pipeline. A stop valve is arranged on the gas pipeline; and the control valve is arranged at the downstream of the accelerator. According to the circulating control system of the fluidized bed gasifier, gas and solid phases are fully mixed by utilizing the accelerator, and then parameters such as downstream speed and density are measured, so that the flow of powder returning gas is greatly reduced, gasification reaction is facilitated, and the conversion rate of gasified carbon is greatly improved.

Apparatus for fluidized bed gasification of solid carbon-containing feedstocks, comprising: a) a fluidized bed gasifier with a reaction chamber, b) a feed device for introducing the feedstock into the reaction chamber, c) a feed device for introducing a fluidizing gas into the reaction chamber, and d) an additive supply and introduction device with a storage container and a metering and introduction device for introducing an additive into the reaction chamber, characterized in that the additive is Ankerite (iron dolomite) or a derived iron-containing mineral material containing calcium and magnesium components, and that the apparatus is designed such that the additive is introduced into the reaction chamber during operation and simultaneously e) catalytically reduces, converts, or reforms tar compounds in the product gas, f) promotes the formation of hydrogen (H2) and / or carbon monoxide (CO) in the product gas.g) binds, transforms or reduces the concentration of sulfur compounds in the product gas, and h) stabilizes the ash properties, in particular by increasing the ash melting temperature and / or reducing the tendency to agglomerate and slag.

The application discloses a biomass fluidized bed gasification system and gasification method suitable for downstream shift device, which comprises a fluidized bed gasification furnace, a cyclone separator, an oxidative cracking furnace, a venturi scrubber, a hydrocyclone and a water washing tower; the fluidized bed gasification furnace, the cyclone separator, the oxidative cracking furnace, the venturi scrubber, the hydrocyclone and the water washing tower are sequentially connected along a synthetic gas flow direction to form a synthetic gas flow route; the system of the application adopts a quenching process, and the water-steam ratio can be about 0.8; the downstream shift device does not need to be supplemented with water vapor, and consumption and investment are saved; the fluidized bed gasification furnace of the application has a high-temperature oxidation zone, tar can be fully cracked, the tar content at the outlet of the fluidized bed gasification furnace is effectively reduced, or there is no tar at the outlet of the fluidized bed gasification furnace.

The invention relates to the technical field of gasification furnaces, and particularly provides a biomass circulating fluidized bed gasification furnace which comprises a boiler, an air distribution plate, a plurality of partition plates, a first air inlet passage and a second air inlet passage. The air distribution plate is in an upward-protruding cone shape, and a plurality of air holes are formed in the air distribution plate at intervals. The plurality of partition plates are arranged above the air distribution plate at intervals and are arranged along the periphery of the air distribution plate at intervals; the first air inlet channel is arranged below the air distribution plate and supplies air upwards through the multiple air holes. The second air inlet channel is arranged below the air distribution plate and supplies air to the peripheries of the partition plates. The air speed of the first air inlet channel is smaller than that of the second air inlet channel, and the oxygen content of the first air inlet channel is smaller than that of the second air inlet channel. According to the scheme provided by the invention, the biomass is subjected to stage treatment, and air flows with different flow rates and different oxygen contents are introduced into the biomass with different sizes, so that the biomass with different sizes can reach a better fluidized state, the reaction of the biomass is more sufficient, and the carbon loss is reduced.

This utility model relates to the field of fluidized bed temperature measurement technology and discloses a fluidized bed temperature measurement device, including: a fluidized bed gasifier and a through groove. The outer wall of the fluidized bed gasifier has a through groove, and the inner wall of the fluidized bed gasifier is fixedly connected to a fixed cover. The fixed cover and the through groove are interconnected, and the inside of the fixed cover is provided with an inner sleeve. This fluidized bed temperature measurement device, through the coordinated operation of its components, allows for easy replacement of the second measuring point if it is damaged. The operator rotates the second bolt counterclockwise to separate it from the circular plate, and then pulls the circular plate away from the fluidized bed gasifier. This allows the second armored thermocouple and the second measuring point to be removed and replaced from inside the fixed cover. At this time, the first measuring point remains inside the fixed cover and is in operation. This design allows for online replacement of a single measuring point without disassembly, enabling the other measuring point to continue operating normally and avoiding unnecessary economic losses.

The utility model relates to the technical field of feeding devices, and discloses an entrained-flow bed gasifier feeding device which comprises a feeding cylinder, a funnel is fixedly connected to the top end of the feeding cylinder, baffles penetrate through the two ends of the feeding cylinder in a sliding mode, and right-angle triangular blocks are fixedly connected to the two sides of the inner wall of the feeding cylinder and correspond to the top ends of the baffles. Guide columns are fixedly connected to the two sides of the bottom ends of the two baffles correspondingly, and rotating columns are rotationally connected to the positions, corresponding to the lower portions of the baffles, of the two ends of the feeding cylinder correspondingly. Through the structures of a motor, a driving shaft, a first gear, a second gear, a third gear, a first crushing shaft, a rotating column, a guide column, a guide groove and the like, the effects of quantitative feeding, prevention of excessive feeding, sufficient combustion and improvement of the combustion efficiency are achieved, and the problems that in the using process of a traditional device, the feeding amount cannot be controlled, and the combustion efficiency is improved are solved. Therefore, the feeding amount is too large, sufficient combustion cannot be achieved, and the combustion effect is affected.

This invention discloses a fluidized bed gasifier, comprising a gasifier, a cyclone separator, and a return pipe. The gasifier includes a shell with an ash outlet at its bottom. A fluidized bed distributor is positioned above the ash outlet. Multiple gas inlets are located between the fluidized bed distributor and the ash outlet. A biomass inlet is positioned above the fluidized bed distributor and connected to a feeding device. The upper end of the shell is connected to the cyclone separator. One end of the return pipe is connected to the bottom of the cyclone separator, and the other end is connected to the shell and above the fluidized bed distributor. The gasifying agent in the fluidized bed gasifier is pure oxygen. This invention uses pure oxygen as the gasifying agent, and the gas inlet is located below the fluidized bed distributor. The pure oxygen entering the gasifier is evenly distributed by the fluidized bed distributor and then contacts the biomass, ensuring complete biomass gasification and preventing the formation of molten ash slag that blocks the gasifier outlet.

Device (1) for treating raw gas (14) from a fluidized bed gasifier (7), comprising a raw gas path through which the raw gas from the fluidized bed gasifier can be conveyed to a gas purification system, wherein a recirculation cyclone (11), a raw gas cooler (12), and a hot gas filter (15) are associated with the raw gas path, characterized in that at least one additive inlet is associated with the fluidized bed gasifier, the raw gas path, and / or a gas path downstream of the hot gas filter, through which an additive for treating inorganic compounds, in particular alkali and chlorine compounds, can be introduced into the fluidized bed gasifier, into the raw gas, and / or into a gas formed from the raw gas, wherein at least one additive inlet is designed as a suspension injection device (1) through which the additive can be injected as a suspension into the fluidized bed gasifier, into a raw gas area associated with the fluidized bed gasifier, and / or into the raw gas path without pelletizing.and wherein the additive addition can be arranged in a hot region of the raw gas path, in the region of the recirculation cyclone, in the region of the raw gas cooler (12), in a cooler region of the raw gas cooler, downstream of the raw gas cooler, upstream of the hot gas filter, in the region of the hot gas filter and / or downstream of the hot gas filter.

The utility model belongs to the technical field of biomass circulating fluidized bed gasification furnaces, and particularly relates to air distribution equipment of a biomass circulating fluidized bed gasification furnace, which comprises a furnace body, three support legs arranged in an annular array are fixedly connected to the side surface of the furnace body, a biomass feeding pipe is fixedly connected to the inner wall of the furnace body, and a biomass discharging pipe is fixedly connected to the inner wall of the furnace body. A ventilation pipe is fixedly connected to the position, located on the lower side of the biomass feeding pipe, of the inner wall of the furnace body, a mounting cylinder is fixedly connected to the upper side of the ventilation pipe, a rotating rod is rotationally connected to the inner wall of the mounting cylinder and rotationally connected with the ventilation pipe, and a clamping hole is formed in the inner side wall of the mounting cylinder. According to the utility model, the air distribution disc and the air distribution holes are matched for use, so that air distribution treatment can be carried out on the gasification furnace, and the impact piece can oscillate the air distribution disc for use under the structures of the heat-resistant steel wire, the heat-resistant spring and the like, so that the air distribution holes are prevented from being blocked by biomass combustion particles, and normal circulation of oxygen is ensured.

The utility model relates to the technical field of coal gasification, in particular to a coal gasification device for coupling a circulating fluidized bed with a fixed bed, which comprises a circulating fluidized bed gasifier which is sequentially connected with an air preheater, a waste heat boiler, a cyclone dust collector, a coal economizer, a bag-type dust collector and a coal gas cooler. Fly ash outlets at the bottoms of the cyclone dust collector and the bag-type dust collector are connected with an ash bin, the ash bin is connected with a fly ash forming device, the fly ash forming device is connected with the fixed bed gasifier, a gas outlet of the gas cooler is connected with a gas output pipe, a gas outlet of the fixed bed gasifier is connected with an auxiliary gas pipe, and the auxiliary gas pipe is connected with the gas output pipe. Or the auxiliary gas pipe is connected to the upper reduction area of the circulating fluidized bed gasifier. The fly ash problem of the circulating fluidized bed gasification furnace is solved, most of carbon in coal is converted into coal gas, and the carbon conversion rate is remarkably improved.

The invention belongs to the technical field of biomass energy chemical industry, and particularly relates to a device and a method for preparing synthesis gas by coupling biomass gasification with high-temperature thermal reforming, and the device for preparing synthesis gas by coupling biomass gasification with high-temperature thermal reforming comprises a multi-section graded fluidized bed gasification furnace, the middle part of a furnace body of the multi-section grading fluidized bed gasification furnace is of a conical barrel-shaped structure, the upper part and the lower part of the furnace body of the multi-section grading fluidized bed gasification furnace are of cylindrical barrel-shaped structures, and the multi-section grading fluidized bed gasification furnace is connected with a high-temperature reforming furnace through a long pipeline; according to the device, the multi-section grading fluidized bed, the agglomerated ash separation component and the high-temperature reforming furnace are coupled, the carbon conversion rate of the device can reach 95% or above, tar and methane can be effectively cracked, and the tar content in synthesis gas is lower than 20 mg / Nm.

Invention relates to a method of converting an existing fluidised bed boiler into a fluidised bed gasifier. The existing fluidised bed boiler (1) comprises a furnace chamber (10), a windbox (20), a particle separator (30). Said method comprises step of providing a first gas-tight partition wall structure (40) inside the furnace chamber (10) so as to divide the furnace chamber (10) into a first gas-tight compartment (101, 121) and a second gas-tight compartment (102, 122), wherein a gasification reactor is provided in the first gas-tight compartment which (101, 121) is connected to inlet (32) of the particle separator (30). Said method further comprises step of providing a second gas-tight partition wall structure (50) inside the windbox (20), such that a first windbox chamber thus formed is configured to deliver fluidising gas to the gasification reactor. Invention relates also to a fluidised bed gasifier (1') retrofitted by said method.

The invention provides a novel biomass circulating fluidized bed gasifier device, belongs to the technical field of biomass energy gasification conversion, and aims to overcome the defects that an existing circulating fluidized bed is complex in structure, low in gasification efficiency and the like. The device comprises a novel biomass fluidized bed cyclone gasifier, a gasification cooling chamber, a gasified fly ash return feeder, a fly ash cooling buffer bin, a feeding preheating dryer and a gasified air preheater, during use, biomass fluidized bed cyclone dust removal and material returning are concentrated in one furnace body to realize internal circulation and external circulation of biomass gasified fuel, the fluidized bed structure is simplified, the biomass carbon conversion efficiency is improved by cyclone high-efficiency separation of a dilute-phase region, and meanwhile, the temperature of the dilute-phase region is improved by high temperature of the dilute-phase region, so that tar cracking is facilitated; the gasification cooling chamber is cooled by water vapor, the water vapor is heated by fuel gas and used for drying biomass feed, water-cooled vapor is generated to condense and heat primary air of the gasification furnace, and the biomass gasification efficiency is improved.