155 results about "Bubbling fluidized bed" patented technology

The invention relates to a sludge drying and burning technique and its system devices, applying to the handling of active sludge in urban sewage treatment plants, its process flows through: wet sludge stock house, measuring bin, sludge mixer, sludge dryer, granular splitter, cooler, drying products storage bin, incinerator, smoke gas cleaning devices, which is characterized by: said incinerator is bubbling fluid bed incinerator with coal economizer, air heater fixed in its end part, high-heat smoke gas generated by burning is used to heat heat-conducting oil and cool air individually, and heat-conducting oil after being heated is transferred to sludge dryer through the circulating pump to dry wet-sludge. The invention is characterized by: take heat-conducting oil as heating medium, use the heat generated by burning dry sludge to heat heat-conducting oil and then dry wet-sludge to make full use of resources; the volume-reducing quantity after drying and burning could reach over 90%; the percentage of desulphurization in incinerator could reach 75% as a result of adopting two stage technology of sulfur removal, and the gross percentage of desulphurization meets national environmental legislation requirements. The invention accomplishes the resources, volume reduction, and innocence of sludge.

The present invention is one method of generating hydrogen via catalytic thermolysis and gasification of biomass. The hydrogen generating apparatus consists of circulating fluidizing bed, cyclonic separator and bubbling fluidizing bed connected serially. The hydrogen generating process the fluidization of biomass with steam in circulating fluidizing bed with catalyst CaO/MgO grains; the catalytic thermolysis and gasification of biomass to produce hydrogen; the fixation reaction of CO2 in gas product with catalyst CaO/MgO grains to form CaCO3/MgCO3; the separation of CaCO3/MgCO3 grains and coke grains in cyclonic separator; burning of coke grains to promote the decomposition of CaCO3/MgCO3 to release CO2 and high temperature CaO/MgO grains; and returning the high temperature CaO/MgO grains to the circulating fluidizing bed as catalyst and heat source.

A method for co-producing a sulfur-containing raw synthetic gas and an essentially desulfurized solid residue from a sulfur-containing heavy petroleum residue feedstock, comprising feeding a bubbling fluidized-bed gasification reactor with the feedstock, and converting the feedstock to a raw synthetic gas by a partial oxidation reaction in the presence of water at a temperature at or below about 1000° C. and a pressure at or below about 10 atm, thereby also producing an essentially desulfurized solid residue, while the sulfur components are essentially comprised in the raw synthetic gas; and separately recovering the essentially desulfurized solid residue and the sulfur-containing raw synthetic gas.

The invention belongs to the gas-solid fluidized bed reactor field and relates to a dual-distributing plate coal-based serial fluidized bed chemical-chain combustion apparatus suitable for the chemical-chain combustion of burning coal and other solid fuels; the bottom of a bubbling fluidized bed is provided with a gas inlet and a feed port; the inside of the bubbling fluidized bed is divided into three regions by two distributing plates; the bottom of a low gas velocity region and the bottom of a high gas velocity region are respectively provided with a distributing plate; the middle between two regions is provided with a transition region with a reduce section to realize different gas flow velocities in the low gas velocity gasification region and the high gas velocity deoxidization region; the upper part of a bubbling fluidized bed is in tubular communication with the upper part of a cyclone separating device; the top of the cyclone separating device is provided with an exhaust port which is communicated with a gas inlet of the bubbling fluidized bed; the lower part of the cyclone separating device is pumped to the low gas velocity gasification region by a feed leg; the bottom of the high gas velocity deoxidization region is communicated with a circulating fluidized bed by a feed returning device; the bottom of the circulating fluidized bed is provided with an air inlet; the upper part of the circulating fluidized bed is communicated with the cyclone separating device. The dual-distributing plate coal-based serial fluidized bed chemical-chain combustion apparatus has the advantages of low cost, flexible operation, high thermal efficiency, wide application range, etc.

The invention provides a pulverized coal combustion method with the function of capturing CO2, comprising the steps: CuFe2O4 is decomposed to generate O2 and oxygen vacancy ferrite CuFe2O4-delta (delta is no less than 0 but no more than 2); oxidation reaction is generated between the pulverized coal and the oxygen vacancy ferrite so as to generate CO2, H2O and non-condensed gas, wherein the oxidation reaction is generated between the non-condensed gas and O2 which is obtained by decomposition so as to generate CO2 and steam. The device for achieving the method comprises a loop which is formedby the communication of a fast fluidized bed, a first cyclone separator, a two-stage type bubbling fluidized bed, a U-type flow seal valve and the fast fluidized bed in sequence; and the bubbling fluidized bed is also communicated with a second cyclone separator which is communicated with an ash catching device. The pulverized coal combustion method with the function of capturing CO2 effectively combines a pure oxygen combustion technology of coal with a chemical chain combustion technology, not only lowers the preparation cost of the pure CO2, but also fully realizes the separation of the high-concentration CO2 after the coal reaction.

The invention provides a fuel coal chemical looping combustion CO2 separation method in coupling with pure oxygen gasification. In a fuel reactor, a gasification agent (B) composed of water vapor and a small amount of oxygen enters from the bottom of a bed of a bubbling fluidized bed gasification furnace (1), the bed material (C) is coarse-grained inert material and performs fluidization movement under the action of the gasification agent and forms a dense phase zone; fine powdered coal (A) is added into the bubbling fluidized bed gasification furnace (1) from the dense phase zone and performs gasification reaction with the gasification agent (B), so as to form coal gas and unburned carbon (D); oxygen carrier particle (E) enters from the bottom of a lifting pipe (2) and reacts with the combustible components such as CO, H2 and CH4 in the coal gas, so as to generate CO2 and H2O. The flue gas composed of CO2, water vapor, uncompleted burned combustible gas and tiny amount of carbon-containing fine fly ash enters into a reburning chamber (13), wherein the combustible gas and the carbon in the fine fly ash perform combustion reaction with oxygen (J) from an oxygen inlet (14) of the reburning chamber, so as to generate CO2 and H2O.

This invention relates to a method for producing hydrogen by using combustible reducing gas as raw material, and using iron/ferrous oxide as oxygen-carrier, during the reaction in a fluidized bed reactor, with coproduct of high concentration carbon dioxide. This invented equipment comprises: a circulation fluidized bed, a moveable bed, a bubbling fluidized bed, a hydrogen separator unit and a carbon dioxide separator. A horn type bucket is used under the bottom of hydrogen separator and connecting the lower part of the bubbling fluidized bed; the bottom of the carbon dioxide separator is connected with horn type bucket; a contraction type bucket is used for connection middle lower part of the bubbling fluidized bed and the moveable bed; the upper part of moveable bed is connected with the middle part of the circulation fluidized bed; the lower ends of the circulation fluidized bed and moveable bed and bubbling fluidized bed are equipped with fluidized steam inlets A and B gas fuel inlet C. This invention has advantages of: simple struction, low cost and high efficiency.

The invention provides a process for refining molten iron by directly using low-grade iron ores. The process comprises the following steps that: 1, low-grade iron ores are magnetically roasted in a fluidized bed reactor to obtain iron ores with stronger magnetism; 2, the fine ores obtained after roasting enter a hot magnetic separator to obtain hot iron ores with higher grade by hot magnetic separation; 3, the high-quality hot iron ores, which are obtained by magnetic separation, are added into a pre-reduction multi-stage fluidized bed to obtain pre-reduction iron ores with a higher reductiondegree, wherein the pre-reduction multi-stage fluidized bed is combined by a 2 to 4-stages circulating fluidize bed and a bubbling fluidized bed reactor, and after being reduced by the pre-reduction multi-stage fluidized bed, the metallization rate of the fine ores is over 60 percent; and 4, the pre-reduced iron ores are directly injected in a final reduction furnace or fusion gasification furnaceby a hot-pressed block for final reduction refining so as to obtain the molten iron. In the process, the refining process of the low-grade iron ores is completed by fully using energy in the technological process and the low-grade iron ores avoids repeated heating and cooling when being refined into the molten iron, so the energy consumption is greatly reduced.

The invention discloses the treatment technology for biomass solid waste and hazardous waste. Materials are sequentially subjected to pretreatment, loading, pyrolysis and gasification, and combustion and steam making, and the generated tail gas is subjected to the fuel gas treatment. The combustion temperature of a pyrolysis and gasification furnace is controlled at 700-900 DEG.C when the pyrolysis and gasification furnace treats the solid waste such as mushroom dregs, so that a problem that a static bed is liable to coke is avoided. The whole operation is performed in the reduction environment, NOx can be effectively prevented from generating, the disturbance of the materials in the whole bed is high, and the whole gas output and the factor of created gas are stable. Waste liquid and ash output by a pyrolysis and gasification bed can be fully combusted and burned out through the fuel gas output by the pyrolysis and gasification bed, so that carbon residue in the ash can be further reduced, and the waste liquid can be thoroughly eliminated. A bubbling fluidized bed combustion tower employs pyrolysis and gasification bed ash as the bed material, and the fluidization of the materials in the furnace can be promoted after the air enters the combustion tower.

The invention discloses a method for generating power by gasifying integrated straws in a supercritical coal-fired generator set. The method comprises the following steps of: packing and forming biomass straws serving as a gasification raw material of a gasifier of a bubbling fluidized bed, wherein primary wind-heat air surplus in a power station and tail gas fume of a boiler are used as gasifying agents. A biomass gasifier is effectively integrated by simply modifying the conventional supercritical unit to make biomass gasified, combusted and generate power, so that the defect that the biomass is directly blended and combusted is effectively overcome, the influence of biomass ash on fly ash is avoided, and the problem that the conventional auger feeding equipment is easy to damage is solved; therefore, biomass energy can be efficiently utilized and pollutant emission of coal-fired power stations is further reduced.

The invention provides a chemical looping combustion device and method based on a tower bubbling fluidized bed fuel reactor. The device is a circulating loop composed of an air reactor, an air cyclone separator, a return feeder, the tower fuel reactor, a fuel cyclone separator and an isolator. The method includes the steps that fuel in the tower fuel reactor sequentially upward passes through small chambers divided by multiple independent air distribution partition boards in the height direction to be subjected to deep oxidation reaction with oxidation state oxygen carriers, the mixture is converted into CO2 and H2O to be discharged, reduction state oxygen carriers enter the air reactor through the fuel cyclone separator and the isolator for oxygen carrier regenerative reaction to generate oxidation state oxygen carriers, and the oxidation state oxygen carriers are separated through the air cyclone separator and then enter the fuel reactor through the return feeder; solid fuel is subjected to gasification reaction in the small chamber on the lower portion of the fuel reactor and then is subjected to oxidation reaction. By means of the device and method, the air-solid flow state in the fuel reactor can be effectively improved, and chemical looping combustion efficiency is improved.

A circulating fluidized bed (CFB) boiler comprising a reaction chamber. A bubbling fluidized bed (BFB) is contained within an enclosure within the lower portion of the reaction chamber and contains an in-bed heat exchanger (IBHX) that occupies part of the reaction chamber floor. At least one non-mechanical valve, which includes an opening between the CFB and BFB and independently controlled fluidizing means located both upstream and downstream of the opening, is used to control the heat transfer to the IBHX by controlling the solids discharge from the BFB to the CFB. The elevation of the bottom of the opening is at or above the elevation of the fluidizing means. A flow control barrier may be located downstream of the opening.

An indirect combustion apparatus with serially connected fluidized beds for burning coal is composed of circulating fluidized-bed air reactor, bubbling fluidized-bed fuel reactor, moving fluidized-bed gas isolator, and cyclone separator, all of which are serially connected. Its combustion method includes mixing powdered coal with water, delivering the mixture to the water-coal slurry gasifying reactor, feeding the resultant gas in bubbling fluidized-bed fuel reactor and moving fluidized-bed gas isolator, oxidizing reaction between air and metal in said circulating fluidized-bed air reactor and separating by cyclone separator to obtain metallic oxide, reaction between said metallic oxide and said resultant gas in the bubbling fluidized-bed fuel reactor to reduce it into metal, returning back to said air reactor for regenerating metallic oxide, and reacting with water-coal slurry in fuel reactor to generate Co2 and H2O.

A method for reducing nitrogen oxide emissions of a bubbling fluidized bed boiler burning biofuel and an air distribution system for a bubbling fluidized bed boiler biofuel. A fluidized bed is arranged in a lower part of a furnace of the boiler. The bed is fluidized by fluidizing gas that includes primary air. Fuel is fed to the fluidized bed, which dries and pyrolizes into pyrolysis gas including volatile matter of the fuel. The gas rises upwards in the furnace and burns. Secondary air is supplied above the fluidized bed from secondary air nozzles, and tertiary air is supplied above the secondary air nozzles. A part of primary air is supplied in connection with fuel feeding such that the fuel is forced substantially on the surface of the fluidized bed, thus pyrolizing entirely, and at least a part of the pyrolysis gases formed in the pyrolysis is burned by primary air such that the air coefficient in relation to the volatile matter of fuel in the pyrolysis gases is in the substoichiometric area.

The invention discloses a composite type solid-waste gasifying device. The composite type solid-waste gasifying device is characterized in that a reciprocating grate and a bubbling fluidized-bed reactor structure are combined, waste is firstly dried, pyrolyzed and gasified on the front-section reciprocating grate, and the rear-section fluidized bed device is used for pyrolysis of residual waste and suspended combustion of gasified slag. The reciprocating grate adopts a plurality of sections of high-temperature air distribution to dry, pyrolyze and gasify the waste so as to provide partial heat, and a long rear arch maintains high temperature under high-temperature flue gas, and is used for increasing radiant heat on the grate and providing energy for pyrolyzing and gasifying the waste with low calorific value. The high-temperature flue gas generated by combustion of a fluidized bed maintains high-temperature environment of the wall surface of the rear arch of the grate, and the slag is discharged by a slag discharging hole at the middle part of an air distributing plate of the fluidized bed. The composite type solid-waste gasifying device disclosed by the invention has the beneficial effects that the advantages of the traditional grate and the traditional fluidized-bed reactor are integrated; due to the radiation of a long high-temperature rear arch, the content of tar in gasified gas can be effectively reduced; full burning out of bottom slag is realized by the fluidized bed, so that high-efficiency gasification of low-grade waste is realized.

The invention provides a chemical chain combustion method for coalbed methane and an interconnected fluidized bed system. The method comprises the following steps: carrying out oxidization reaction on preheated air and a nanocopper oxygen carrier to generate nano CuO oxygen carrier particles and flue gas; then carrying out combustion reaction on nano CuO oxygen carrier particles and coalbed methane under lighting to generate a mixed gas and a nanocopper oxygen carrier; enabling the nanocopper oxygen carrier to repeat the steps; condensing and collecting the mixed gas, wherein the nanocopper oxygen carrier is formed by mixing nano CuO and inert carriers according to the ratio of (1.5-3.5) to 1, and the particle size of the nano CuO is 20-40nm. The system comprises an air heating device, a high-speed lifting fluidized bed, a cyclone separator, a first overflowing device, a bubbling fluidized bed, a heat recovery device and a CO2 collector which are sequentially connected, and an illumination device is arranged in the bubbling fluidized bed. The circulating times of the oxygen carrier can be increased by 23%, and the oxidization rate of surface deposits on the oxygen carrier is increased to 44.23%-75.11%.

A non-mechanical valve arrangement for use with circulating fluidized bed (CFB) boilers has a CFB reaction chamber and a bubbling fluidized bed (BFB) within an enclosure in the lower portion of the CFB reaction chamber, the BFB containing an in-bed heat exchanger (IBHX). Solids flowing from the BFB enclosure to the CFB reaction chamber may be controlled using one or more non-mechanical valves. Each non-mechanical valve is independently controlled using independently controlled fluidizing means. The non-mechanical valve has collectors to collect solids backsifting into the fluidizing means of the valve. Agglomerates are removed which could block the valve. Channel walls parallel to the direction of solids flow through the valve opening may be provided to reduce external interference with local fluidization to maintain the proper functionality of the non-mechanical valve.

The present invention provides a liquefaction-suspension combined combustion boiler comprising a vertical combustion chamber arranged in routine boiler, the combustion chamber has a bubble fluidized-bed combustion section equipped with a feeder, fluidized bed slag discharge opening on bottom; the combustion chamber has a low-temperature reducing property main combustion section on lower portion and a high temperature oxidation combustion section on upper portion. The main combustion section on lower part of the combustion chamber comprises a primary air nozzle and auxiliary air ejector nozzle arranged on walls on opposite sides of the combustion chamber for mixture of primary air-fuel entering into the combustion chamber. The high temperature oxidation combustion section on upper portion of the combustion chamber has at least one layer of secondary air nozzle arranged above the primary air nozzle. The primary air-fuel mixture nozzle and the oppositely arranged auxiliary air ejector nozzle form a strong rotation-circulation flow field at lower part of the combustion chamber, which implements combustion of majority of fuel in main low-temperature and reducing property combustion section, uncombusted particle and fuel gas are combusted on upper portion of the combustion chamber. The invention has advantages of high combustion efficiency, low harmful substance discharge, simple structure, safe and reliable operation.

The invention discloses a preparing method of sulfur dioxide to sinter troilite through circulated bed in the chemical raw material preparing technological domain, which is characterized by the following: adopting ferric oxide with 40-50 um even particle diameter as bed material; making inner bed material lie rapid fluidization condition through adjusting fluidization wind quantity; heating bed material at 845-855 deg.c; improving evenness of inner bed temperature and composite gas-solid as well as one-set product; guaranteeing enough reacting time for fine particle separated from circulated fluidization bend reactor; allocating separating system and return system; separating fine particle from gas; sending the separated material to reactor continuously.

The invention provides a method for zero emission of CO2 from burning coal. The method comprises the following steps: MFe2O4 (M stands for any of Cu, Ni, Mn and Co) oxygen carrier is decomposed to generate oxygen deficient ferrite MFe2O4-delta (delta is more than or equal to 0 and is less than or equal to 2) and O2, the oxygen deficient ferrite and coal gasified products carry out reduction reaction to generate CO2, H2O and noncondensable gas, wherein the noncondensable gas and the O2 which is obtained by decomposition carry out oxidation reaction to generate CO2 and steam; and the generated CO2 and steam and the reduced oxygen deficient ferrite carry out reduction reaction to generate synthetic gas consisting of CO and hydrogen, thus realizing zero emission of CO2. The invention also provides a device for realizing the method, and main components of the device are a rapid fluidized bed, a two-section spouted-fluidized bed and a bubbling fluidized bed. The method and the device realize efficient and clean use of the burning coal and true zero emission of CO2, avoid energy and cost consumption of long-distance transmission of CO2 and have wide application prospect.

The invention relates to a flying ash processing device of a fluidized bed incinerator. The flying ash processing device comprise a cyclone separator, a flying ash conveying system, a bubble fluidized bed device and a moving bed ash cooler; the cyclone separator is arranged between the fluidized bed incinerator and a tail part flue and is communicated with the bubble fluidized bed device through the flying ash conveying system at the same time; the moving bed ash cooler is communicated with the bubble fluidized bed device; a buried tube heat exchanger is further arranged inside the moving bed ash cooler; the input end of the buried tube heat exchanger is connected with a water feeding pump of the fluidized bed incinerator; and the output end of the buried tube heat exchanger is connected with a coal economizer of the fluidized bed incinerator. With the adoption of the flying ash processing device, the flying ash is effectively captured before the pollutants are accumulated to the surface of the flying ash, and the sensible heat of the flying ash is effectively absorbed, so that the discharge quantity and the processing cost of the flying ash are greatly reduced, the accumulated ash, the abrasion and the corrosion to the heated plane at the tail part of the fluidized bed incinerator are reduced, the resource utilization of the flying ash is realized, the defects that a traditional method is large in capacity-increase and high cost are made up, the sensible heat of the flying ash is effectively used, and the heat economy of the system is improved.

The invention provides an industrial slag salt bubbling fluidized bed incineration harmless treatment device. The device can be used for conducting batched harmless treatment on industrial slag salt, the purity of obtained salt particles is high, and the treatment technology is simple. The device comprises a vertically-arranged incinerator. The lower portion of the incinerator is provided with a dense-phase incineration area, and the upper portion of the incinerator is provided with a dilute-phase incineration area. The diameter of the dense-phase incineration area is smaller than that of the dilute-phase incineration area. A distribution plate is arranged at the bottom of the dense-phase incineration area, and an air inlet pipeline is connected to the distribution plate. One side of the dense-phase incineration area above the distribution plate is connected with a feeding pipe, and the other side of the dense-phase incineration area above the distribution plate is connected with a discharging pipe. An inlet of the feeding pipe is arranged above an inlet of the discharging pipe. The top of the incinerator is in pipeline connection with a single-pipe cyclone separator A which is in pipeline connection with a single-pipe cyclone separator B.

The invention provides a municipal sludge incinerating system using rubbish landfill gas as auxiliary fuel. Dehydrated municipal sludge is incinerated after being dried and smashed, an incinerator used for incineration adopts a bubbling fluidized bed incinerator, primary air combusted and heated by the rubbish landfill gas is blown into and the rubbish landfill gas is led into to be used as the auxiliary fuel so as to maintain the temperature of a fluidized bed in the sludge incinerator. The invention greatly improves the incineration efficiency of the municipal sludge, fully utilizes the heat energy of the rubbish landfill gas, lowers the incineration treating cost of the municipal sludge, and achieves the purposes of treatment of a waste by another waste, energy saving and environment protection and remarkable economic benefit.