40 results about "Bubbling fluidized bed" patented technology

An autothermal process of concentric bubbling fluid double bed for the production of syngas by gasification with biomass steam, in the presence of a granular material includes: continuous gasification under stationary bed condition of said granular material in bubbling fluidisation regime of biomass with water vapour with thermochemical transformation of the fuel into raw syngas and char, the raw syngas including heavy hydrocarbons in the steam state and any harmful compounds in traces, in a first reaction volume; combustion in bubbling fluidised bed with air of the char and of auxiliary fuel in a second reaction volume; the transfer velocity of the granular material between the first and second reaction volumes being such that the thermal difference does not exceed 20° C.; separation from the raw syngas by hot filters; and elimination of any harmful compounds in traces.

The invention relates to a method for producing methane through biomass hydrogasification. The method comprises the following steps: S1, the water electrolysis hydrogen production device produces hydrogen and oxygen; s2, fully mixing the biomass particles with steam in a biomass hydrogenation bubbling fluidized bed reactor, and hydrogen and oxygen from a water electrolysis hydrogen production unit for reaction to generate crude synthesis gas rich in methane; s3, cooling the crude synthesis gas rich in methane in a waste heat recovery unit and producing cooled crude synthesis gas and steam; s4, removing fly ash and part of impurities from the cooled crude synthesis gas in a dust removal washing unit to obtain washed crude synthesis gas; s5, converting the washed crude synthesis gas in a carbon monoxide conversion unit to obtain converted synthesis gas; s6, removing carbon dioxide and other impurities from the converted synthesis gas in a synthesis gas purification unit to obtain purified synthesis gas; s7, separating 0-55vol% of the purified synthesis gas in a gas separation unit to generate carbon-rich gas and hydrogen-rich gas; and S8, generating methane from the residual purified synthesis gas in a methanation unit.

The invention relates to a method for efficiently preparing hydroxylamine hydrochloride. The method comprises the following steps: mixing a diacetylmonoxime solution and a hydrochloric acid solution, pretreating through a pressurized nano-bubble fluidized bed, and carrying out reaction distillation under heating and pressurizing; after the reaction is finished, cooling reaction liquid, performing primary filtration and suction filtration through cross-flow filtration equipment, and collecting hydroxylamine hydrochloride crystals; and washing the crystal with absolute ethyl alcohol, recovering ethyl alcohol through cross-flow filtration equipment, and finally freeze-drying to obtain the high-purity hydroxylamine hydrochloride. The preparation method comprises the following steps: stirring quinoline-8-yl acrylate, tributyltin acrylate, 4-vinyl benzocyclobutene, ethanol and benzoyl peroxide to obtain a mixed solution; immersing the PTFE membrane subjected to low-temperature plasma pretreatment into the mixed solution, and then carrying out ultrasonic cleaning and vacuum drying to obtain a polymer modified PTFE membrane; the hydroxylamine hydrochloride prepared by the method disclosed by the invention has relatively high purity and yield, and meanwhile, the content of heavy metal ions and the content of water are effectively reduced.

The invention discloses a megawatt pressurized bubbling fluidized bed oxygen-enriched combustion test platform and a combustion method. The platform comprises a feeding system, a pressure swing adsorption oxygen production and gas inlet system, a deslagging system, an oxygen-enriched combustion reaction system and a flue gas and fly ash sampling treatment system. The feeding system adopts a spiral and star-shaped double-path independent pressure feeding unit, and is provided with a multi-stage stock bin, a drying device and a pipeline cooling structure, so that pressurized continuous feeding is realized, and tempering is prevented; the pressure swing adsorption oxygen generation and gas inlet system generates oxygen-enriched gas through a PSA technology, and the oxygen-enriched gas is mixed with CO2 to form a graded oxygen-enriched atmosphere; according to the oxygen-enriched combustion reaction system, accurate temperature control is achieved through an air distribution plate, a reducer pipe and a partition heat exchange device, and generation of NOx is restrained; the problems of unstable fuel supply, unreliable deslagging, low combustion efficiency, difficulty in CO2 enrichment and the like under the high-pressure oxygen-enriched combustion condition in the prior art can be effectively solved.

The invention discloses a bubbling fluidized bed boiler for burning biomass fuel, and belongs to the technical field of boilers, the bubbling fluidized bed boiler comprises a boiler body, an air chamber is fixedly mounted on the boiler body, and an air pipe is fixedly mounted on the air chamber. According to the scheme, through the filter plate, burnt slag can enter the discharge chamber through the filter plate, the slag can preliminarily heat airflow in the air chamber at the moment, so that the slag can be preheated and utilized, the arrangement of the air chamber can prevent the slag from being combined with the airflow to influence the fluidization effect of bed materials, and when the slag in the discharge chamber needs to be discharged, the slag can be conveniently discharged. A user can start the motor, then the motor drives the auger to rotate, slag can be driven to move out of the boiler body in the auger rotating process, and therefore automatic slag discharging can be achieved, bed materials are prevented from being discharged by mistake, the situation that the slag makes contact with airflow again, and the fluidization effect is affected can be avoided, and the slag discharging effect is improved.

The invention belongs to the field of catalytic processes. In particular, the present invention relates to a thermocatalytic cracking process for the preparation of low molecular weight monocyclic aromatic compounds. According to the present invention there is provided a thermocatalytic cracking process for preparing a low molecular weight monocyclic aromatic compound from a feed stream comprising biomass and / or one or more polymers, the process comprising the steps of: a) subjecting the feed stream comprising biomass and / or one or more polymers to a pyrolysis treatment at a pyrolysis temperature to produce a pyrolysis steam; b) optionally cooling or heating the pyrolysis steam; c) contacting the pyrolysis steam with an aromatization catalyst at an aromatization temperature in a catalytic conversion step to produce a conversion product comprising low molecular weight aromatics, and d) optionally recovering low molecular weight monocyclic aromatics from the conversion product, the catalytic conversion step c) being carried out in a stationary or bubbling fluidized bed reactor.

The invention discloses a fluidized gasification-pyrolysis conveying coupled reaction device which comprises an air chamber, an air distribution plate, a bubbling fluidized bed reactor, a transition section, a conveyor I, a spiral feeder, a conveyor II and a gasification furnace, a material outlet of the spiral feeder is connected with one side end of the bubbling fluidized bed reactor, the other side end of the bubbling fluidized bed reactor is connected with the conveyor I through the conveyor II, the bottom end of the bubbling fluidized bed reactor is connected with the top end of the air chamber, and the air distribution plate is arranged between the bubbling fluidized bed reactor and the air chamber. The top end of the bubbling fluidized bed reactor is connected with a conveyor I through a transition section, and the tail end of the conveyor I is communicated with an inlet of the gasification furnace. Through coupling of the two conveyors, semicoke particle pyrolysis and conveying integration is achieved, the bubbling fluidized bed has the advantages of being long in particle retention time and sufficient in gas-solid contact of the bubbling fluidized bed and also has the advantages of being high in external circulation flow rate and sufficient in semicoke particle pyrolysis, and support is provided for follow-up efficient gasification of a gasification furnace.

This invention provides a computer program, an information processing method, and an information processing device for detailed observation of the inside of a bubbling fluidized bed combustion furnace. [Solution] The computer program acquires images of the inside of a bubbling fluidized bed combustion furnace using an infrared camera, generates a brightness distribution inside the bubbling fluidized bed combustion furnace and a velocity vector distribution representing the distribution of velocity vectors of moving objects inside the bubbling fluidized bed combustion furnace based on the images, and causes the computer to execute a process to output analysis results based on the brightness distribution and the velocity vector distribution.

The utility model discloses a fluidization gasification - pyrolysis conveying coupling's reaction unit, including air chamber, cloth air distribution board, bubbling fluidized bed reactor, transition section, conveyor I, screw feeder, conveyor II and gasification furnace, the material outlet of screw feeder is connected with the one side end of bubbling fluidized bed reactor, and the other side end of bubbling fluidized bed reactor is connected with conveyor I through conveyor II, and the bottom of bubbling fluidized bed reactor is connected with the top of air chamber, and cloth air distribution board sets up between bubbling fluidized bed reactor and air chamber, and the top of bubbling fluidized bed reactor is connected with conveyor I through transition section, and the end of conveyor I is in communication with the inlet of gasification furnace. Through the coupling of two section conveyors, realize half -coke granule pyrolysis conveying integration, have both the advantage that bubbling fluidized bed granule stays long, gas -solid contact is sufficient, and have the advantage that external circulation flow rate is high, and half -coke granule pyrolysis is sufficient, provide the support for the efficient gasification of subsequent gasification furnace.

The H-shaped dry and wet sludge mixed incinerator can directly receive wet sludge as a material, and compared with the prior art, dewatering or drying equipment does not need to be independently arranged for the wet sludge, so that the system complexity is reduced, and the system operation cost is also reduced; meanwhile, sludge incineration and flue gas incineration are respectively arranged in the incineration chamber and the secondary combustion chamber based on an H-shaped structure, the solid incineration chamber and the flue gas incineration chamber are separately arranged, high-temperature flue gas generated after dry and wet sludge on the bubbling fluidized bed is combusted is directly subjected to secondary combustion in the secondary combustion chamber from the flue gas guide channel, and the combustion efficiency is high; compared with an existing integrated furnace body, combustion-supporting heat does not need to be additionally increased, and the overall operation cost of the system is further reduced.

The invention discloses a bubbling fluidized bed biomass boiler feeding device based on fluidizing gas regulation, and relates to the technical field of fuel conveying, the bubbling fluidized bed biomass boiler feeding device comprises a feeding pipe, a feeding pipe, a vertical pipeline, a feeding mechanism, a feeding mechanism and a feeding mechanism, the feeding pipe is communicated with the surface of the upper end of the vertical pipeline, and the feeding pipe is communicated with the bottom end of the vertical pipeline; the feeding mechanism is arranged in the feeding pipe and the vertical pipeline, the feeding mechanism comprises an auger rotationally connected with the interior of the feeding pipe, the left end of the auger is fixedly connected with a second rotating shaft, the left end of the second rotating shaft is fixedly connected with a first beveling gear, and the top end of the interior of the vertical pipeline is rotationally connected with a first rotating shaft; and the lower end of the first rotating shaft is fixedly connected with a second beveled gear, so that the problems that an arch bridge is formed due to the fact that particles are stuck with one another, finally fuel flow is interrupted, biomass fuel suddenly flows into the arch bridge when the arch bridge collapses, and stable conveying of the biomass fuel is affected are solved.

A gas-solid two-fluid simulation method for a bubbling fluidized bed includes: S1. Using Solidworks to establish a three-dimensional model of the bubbling bed and importing the model into open source software; S2. Setting physical property parameters and establishing a microscale model of particle dynamics; S3. Refining the simulation based on the two-fluid method, setting different working conditions for simulation, verifying the effectiveness of TFM simulation when the grid is smaller than the particle diameter, and establishing a data connection between the coarse grid simulation and the fine grid simulation; S4. Calculating the two-phase drag force using the fine grid simulation data; S5. Correlation analysis between the refined data and the two-phase drag force, determining the input and output parameters of the training, and normalizing the data; S6. Building a complete artificial neural network training model; using Python tools to establish a nonlinear fitting relationship between the input and output parameters through the artificial neural network, and constructing a drag model; S7. Implanting the self-built model through secondary development, applying the model to large-scale industrial equipment, and verifying the model.

Various aspects provide for a fluidized bed reactor comprising a container having a bed of bed solids and a splashgenerator configured to impart a directed momentum to a portion of the bed solids. A bedwall may separate the bed solids into first and second reaction zones, and the directed momentum may be used to transfer bed solids from one zone to the other. A return passage may provide for return of the transferred bed solids, providing for circulation between the zones. A compact circulating bubbling fluidized bed may be integrated with a reactor having first and second stages, each with its own fluidization gas and ambient. A multistage reactor may comprise a gaswall separating at least the gas phases above two different portions of the bed. A gaslock beneath the gaswall may provide reduced gas transport while allowing bed transport, reducing contamination.

The utility model relates to a system for producing methane by biomass pyrolysis gasification, which comprises a riser reactor, a first gas-solid separator, a bubbling fluidized bed reactor and a second gas-solid separator, the riser reactor comprises a biomass raw material inlet, a solid heat carrier inlet, a pyrolysis product outlet and a first fluidized gas inlet; the first gas-solid separator comprises a pyrolysis product inlet, an oil-rich pyrolysis gas outlet and a pyrolysis semicoke outlet; the bubbling fluidized bed reactor comprises a pyrolysis semi-coke inlet, a crude synthesis gas outlet containing gasified semi-coke, a slag outlet, a solid heat carrier outlet, a second fluidizing gas inlet and a gasified semi-coke inlet; the second gas-solid separator comprises a gasified semicoke-containing crude synthesis gas inlet, a crude synthesis gas outlet and a gasified semicoke outlet; the pyrolysis product outlet is communicated with the pyrolysis product inlet, the pyrolysis semi-coke outlet is communicated with the pyrolysis semi-coke inlet, the gasified semi-coke-containing crude synthesis gas outlet is communicated with the gasified semi-coke-containing crude synthesis gas inlet, and the gasified semi-coke outlet is communicated with the gasified semi-coke inlet.

An apparatus for converting a plastic melt to hydrocarbons includes a moving bed cracking reactor for an anaerobic plastic pyrolysis reaction to produce gaseous and liquid hydrocarbons and a solid carbon-rich residue. A separate bubbling fluidized combustion bed reactor is connected to the cracking reactor by a solid particulate loop. Particles are circulated from the cracking reactor to the combustion reactor at a controlled mass rate and a controlled temperature at the cracking reactor inlet. Particles and solid pyrolysis products exiting the cracking reactor outlet are discharged through a non-mechanical valve into the combustion reactor inlet at a desired rate. Particles and combustion products are pneumatically transported in a vertical transport riser, separated from the gas in a gas-solid separator, sent to a bubbling fluidized bed buffer to regulate its temperature, and ultimately sent through a non-mechanical valve to a cracking reactor inlet at a desired rate.

This invention provides a method for producing hot-pressed iron blocks from laterite nickel ore hydrometallurgical slag, belonging to the field of laterite nickel ore hydrometallurgical slag utilization technology. The process includes the following steps: S1, pressure filtration and water removal, reducing the moisture content of the wet slag to ≤30%; S2, drying and crushing, reducing the moisture content of the dried slag to ≤5%; S3, preheating, decrystallization, sulfate decomposition, and desulfurization, generating SO2 gas and hot-roasted sand containing oxides such as Fe2O3, Fe3O4, and CaO; S4, the hot-roasted sand is reduced in a multi-stage fluidized bed consisting of a second-stage pre-reduction fluidized bed and a third-stage final reduction horizontal bubbling fluidized bed, using H2 as the reducing agent. After reduction in the second and third-stage reduction fluidized beds, the degree of reduction reaches 65-85% and the metallization rate is >93%, respectively; S5, the reduced iron powder from the third-stage final reduction horizontal bubbling fluidized bed is processed into hot-pressed iron blocks by a hot-pressing device. The purified high-temperature flue gas is then recycled in the burner of a flash heater, thus utilizing the wet smelting slag of laterite nickel ore.

The present invention discloses a process for converting biomass particles into synthesis gas using a pressurized bubbling fluidized bed device, comprising: delivering biomass particles and fluidizing agent particles as raw materials to a gasifier; the gasifier comprises a fluidized bed area, a secondary gasification area and a post-gasification area; a multi-layer gasification nozzle is designed in the gasifier, so that the tar produced by the biomass gasification can be fully reacted in the high-temperature area of ​​the gasifier, the synthesis gas produced by the pressurized bubbling fluidized bed gasifier enters a cyclone separator, and the synthesis gas after separation enters a synthesis gas cooler for cooling; the cooled synthesis gas enters a synthesis gas filter, and the filtered synthesis gas enters a quenching system; the synthesis gas filtered by the synthesis gas filter enters a quenching system's quenching system, is fully contacted with water for cooling, and then enters a washing tower for water washing, and the synthesis gas after cooling and water washing will enter a downstream area; the present invention reduces biomass ash melting and reduces and eliminates tar.

This application relates to a catalytic cracking coke generator, a regeneration system, and a regeneration method. The coke generator, from bottom to top, includes a pre-lifting zone, a reaction zone (either a bubbling fluidized bed or a turbulent fluidized bed), and an outlet zone. The pre-lifting zone is connected to the bottom of the reaction zone and the regenerator, while the top of the reaction zone is connected to the outlet zone. At least one fuel oil inlet is provided at the outlet of the pre-lifting zone or at the bottom of the reaction zone. When the coke generator and system of this application are used in fluidized catalytic cracking reactions with high reaction heat, a coke source can be provided from the reaction system to the regenerator, solving the reaction heat balance problem without affecting the regeneration process and without damaging the physical and chemical properties of the catalyst.

The invention relates to a jet bubbling fluidized bed gasifier with double gas chambers. The jet bubbling fluidized bed gasifier comprises a hearth, an upper gas chamber, a lower gas chamber and a grading deslagging ring pipe, the hearth comprises a pressure-bearing furnace shell and a fluidization distribution plate, a plurality of fluidization air holes are formed in the conical fluidization distribution plate, and the small-caliber end of the fluidization distribution plate is connected with the grading deslagging ring pipe; the hearth below the fluidization distribution plate is divided into the upper gas chamber and the lower gas chamber by a spacer, the top end of the spacer is connected to the fluidization distribution plate, and the bottom end of the spacer is connected to the side wall of the hearth; and the upper gas chamber and the lower gas chamber are respectively provided with a gasifying agent inlet and an ash discharge port. According to the fluidized bed gasifier provided by the invention, the lower part of the hearth is divided into the upper gas chamber and the lower gas chamber through the spacer, and other gases are introduced into one of the gas chambers, so that partial steam fluidization can be replaced, the use amount of steam and the discharge amount of wastewater are greatly reduced, the energy consumption is reduced, and the economic benefit is improved.

The invention belongs to the technical field of grading treatment of wind driven generator blades, and particularly relates to a method and an integrated system for thermochemical grading treatment of waste wind driven generator blades. The integrated system comprises a spiral feeder, a gasification reactor bubbling fluidized bed gasification area, a gasification reactor lifting pipe reforming area, a cyclone separator, a heat exchanger, a bag-type dust collector, a matched gas conveying pipeline, a matched solid conveying pipeline and the like which are connected in sequence. The gasification reaction of the abandoned wind driven generator blade is decoupled into the gasification reaction and the reforming reaction, the solid product generates glass fiber powder, and the gas product realizes clean conversion of high-volatile organic matters into synthesis gas / fuel gas by enhancing the thermal cracking / oxidative cracking effect of organic macromolecules. And finally, stage treatment and resource utilization of the abandoned wind driven generator blades are achieved.

The utility model provides a bubbling fluidized bed thermochemical heat storage reactor, and relates to the technical field of energy storage. The device comprises a shielding layer, an electromagnetic induction coil layer and a heat storage reactor inner wall from outside to inside, and a cavity defined by the heat storage reactor inner wall is filled with thermochemical heat storage materials and induction heating particles which can be jointly fluidized. An air distribution device is arranged at the bottom of the cavity and communicated with the air chamber, and a gas outlet is formed in the top of the cavity. The induction heating particles heated by electromagnetic induction are used as a heat source, and the heat storage material is heated in the reactor cavity. The power regulation of electromagnetic induction heating is more sensitive, so that the temperature rise effect is fed back more quickly. And when the inner wall of the heat storage reactor is also made of a metal material, the heat storage reactor can become a heat source under the action of the electromagnetic induction coil layer, and high-temperature fluidizing air with a heating function is added, so that multiple heat sources are used for heating at the same time, and rapid input of high-power heat energy and efficient heat energy storage can be realized.

The invention relates to the technical field of ferrous metallurgy, in particular to a low-carbon zero-carbon ironmaking device and method.The low-carbon zero-carbon ironmaking device comprises a fluidized bed system and a smelting reduction furnace system, and the fluidized bed system comprises a fluidized bed feeding pipe, a fluidized bed discharging pipe, a fluidized bed air inlet and a fluidized bed air outlet; the fluidized bed system is a multi-stage fluidized bed or a multi-layer fluidized bed, when the fluidized bed system is the multi-stage fluidized bed, at least one stage of fluidized bed is a bubbling fluidized bed, and when the fluidized bed system is the multi-layer fluidized bed, at least one fluidized bed layer is a bubbling bed layer; the smelting reduction furnace system comprises at least one smelting reduction furnace; and the fluidized bed discharge pipe is connected with a solid material spray gun of the smelting reduction furnace. According to the device and the method, the carbon reducing agent and the hydrogen reducing agent can be simultaneously applied in any proportion, and the process requirements of the transition stage of carbon smelting and hydrogen smelting are met.

This invention discloses a multi-scale honeycomb structure Ti(C,N)-based cermet and its preparation method. The cermet has the following composition (mass fraction): Ti: 50.56~53.92, W: 1.96~2.04, Ta: 1.48~1.52, Nb: 1.87~1.93, Mo: 7.51~8.18, Ni: 11.91~16.23, C: 12.61~14.29, N: 6.93~7.06. The preparation method includes the following steps: (1) using Ti(C,N) as the base metal. (1) Using C,N), WC, TaC, NbC, Mo2C, Ni and graphite powder as raw materials, the mixture is prepared and ball-milled; (2) The mixed slurry is poured into a bubbling fluidized bed for fluidized drying to obtain mixed powder; (3) The mixed powder is pressed and sintered under vacuum to obtain multi-scale honeycomb structure Ti(C,N) based metal ceramic, which has good comprehensive mechanical properties; This method achieves multi-scale distribution of fine crystal agglomerates in the mixture by adjusting the drying process, and has the characteristics of low cost, simple process and easy industrialization.

This invention provides a method and apparatus for extracting heme iron based on a dual-membrane cascade and oxygen isolation protection, belonging to the field of biochemical separation and purification technology. The method first constructs a pneumatically suspended hemolytic environment, utilizing a metal sintered microporous distributor to generate a micron-sized inert bubble fluidized bed, achieving red blood cell disruption and deep deoxygenation under zero mechanical shear conditions, solving the molecular damage and oxidation problems caused by traditional processes. Then, a gas-liquid co-flow ultrafiltration mechanism is employed, introducing pulsed plug flow drive to physically peel off the protein gel layer on the membrane surface online, achieving dynamic anti-clogging and long-term stability in the macromolecular separation process. Finally, transmembrane partial pressure extraction is performed based on a reverse gas-scan nanofiltration model, distinguishing the migration paths of water molecules and dissolved oxygen, outputting a highly active concentrate and a closed-loop circulating gas flow. This invention effectively improves the extraction efficiency of the product Fe. 2+ Retention rate, purity, and continuity of industrial production.

The invention discloses a bubbling fluidized bed boiler capable of adjusting an air hole structure of a distribution plate, and belongs to the field of fluidized bed boilers. The bubbling fluidized bed boiler comprises a boiler body, the distribution plate is installed on the lower side in the boiler body, a plurality of circulation grooves are formed in the distribution plate, adjusting assemblies are installed in the circulation grooves, and rotating grooves are formed in the circulation grooves; the upper end of the rotating frame is fixedly provided with a blocking cap; the lower side of the distribution plate is provided with a connecting frame; the upper end of the connecting frame is fixedly provided with a plurality of connecting rods; one side of the lower end of the connecting frame is provided with a bolt in a penetrating manner, the bolt is rotatably connected with the connecting frame, and the upper side of the bolt is in threaded connection with the distribution plate; according to the fuel distribution device, the opening and closing degree of the circulation groove can be adjusted according to the size of fuel through the arranged adjusting assembly, so that the flow speed of gas flowing through the circulation groove can be adjusted, and meanwhile, the stability of fuel of different sizes during combustion is guaranteed.

This invention discloses a bubbling fluidized bed boiler with an adjustable distribution plate pore structure, belonging to the field of fluidized bed boilers. It includes a boiler body, with a distribution plate installed on the lower side inside the boiler body. Multiple flow channels are formed on the distribution plate, and an adjustment component is installed inside each flow channel. A rotating channel is formed inside each flow channel. The adjustment component includes a rotating frame rotatably connected to the rotating channel, with a stop cap fixedly installed at the upper end of the rotating frame. A connecting frame is installed on the lower side of the distribution plate, with multiple connecting rods fixedly installed at the upper end of the connecting frame. A bolt is threaded through one side of the lower end of the connecting frame, rotatably connected to the connecting frame, and its upper side is threadedly connected to the distribution plate. The bolt is used to adjust the distance between the connecting frame and the distribution plate. This invention, through its adjustment component, can adjust the opening and closing size of the flow channels according to the size of the fuel, thereby regulating the gas flow rate through the flow channels and ensuring the stability of combustion for fuels of different sizes.

The present invention provides a process for the hydropyrolysis of biomass, said process comprising the steps of contacting biomass with a hydropyrolysis catalyst in a bubbling fluidised bed reactor under a hydrogen atmosphere, wherein the hydropyrolysis catalyst is prepared by a process comprising the steps of impregnating a gamma alumina carrier with a first impregnation solution comprising a tungsten salt, drying the tungsten-impregnated carrier; then impregnating the dried tungsten-impregnated carrier with a second impregnation solution comprising a source of a metal selected from those in groups 8, 9 and 10 of the periodic table, and, optionally, a molybdenum source, drying the fully impregnated carrier and then calcining it.

This invention discloses a bubbling fluidized bed boiler for burning biomass fuel, belonging to the field of boiler technology. It includes a boiler body with a wind chamber and air ducts fixedly installed on it. This design uses a filter plate to allow the combusted slag to enter the discharge chamber. The slag preheats the airflow within the wind chamber, thus utilizing the preheated slag. The wind chamber design prevents the slag from combining with the airflow, which would affect the fluidization effect of the bed material. When slag needs to be discharged from the discharge chamber, the operator starts a motor, which drives an auger. During the auger's rotation, the slag moves towards the outside of the boiler body, achieving automatic slag discharge. This prevents the bed material from being mistakenly discharged and avoids the slag from re-contacting the airflow, thus improving the fluidization effect and enhancing the slag discharge efficiency.

The invention discloses a phosphogypsum desulfurization device based on a bubbling fluidized bed, the phosphogypsum desulfurization device comprises the bubbling fluidized bed and an air inlet and outlet device, an air cap distribution plate for receiving feed is slidably connected in a reaction pipeline of the bubbling fluidized bed, and the air cap distribution plate is connected with a discharge pipe capable of moving along the reaction pipeline; the discharge pipe penetrates through the hood distribution plate and is communicated with the reaction pipeline above the hood distribution plate; the gas inlet device conveys gas into the reaction pipeline from the lower part of the hood distribution plate; the discharging pipe can adjust the distance between the top of the discharging pipe and the air cap distribution plate; a temperature control assembly is arranged in the bubbling fluidized bed, the temperature control assembly comprises a thermal insulation material filled between the inner wall and the outer wall of the bubbling fluidized bed and a heating rod arranged in the thermal insulation material, and the heating rod is connected with a controller for regulating and controlling the temperature. The distance between the top of a material and the top of the reaction device can be adjusted according to the feeding amount to improve the reaction effect.

The invention relates to the technical field of ferrous metallurgy, in particular to a particle size grading multi-layer bubbling fluidized bed and a direct steelmaking device. The fluidized bed comprises a gas distribution chamber and a plurality of fluidized bed layers from bottom to top, at least one of the fluidized bed layers is a bubbling bed layer, and the bubbling bed layer is a conical bed; the bottom fluidized bed layer is a cooling reduction bed layer, and the gas distribution chamber is provided with a low-temperature reducing gas inlet; the middle fluidized bed layers and the top fluidized bed layer are heating reduction bed layers, the heating reduction bed layers are divided into a fine particle bed layer and a coarse particle bed layer, and the fine particle bed layer is located above the coarse particle bed layer; except for the bottom fluidized bed layer, each fluidized bed layer is provided with a discharging pipe, the bottom fine particle bed layer is provided with a fine material discharging pipe, and the bottom fluidized bed layer is at least provided with a bottom discharging pipe. The cooling reduction bed layer is arranged, the temperature of DRI powder discharged from the fluidized bed is low, the iron grade can be directly improved after magnetic separation, direct steelmaking is achieved, and carbon emission in the whole steelmaking process is greatly reduced.