528results about "Fluidized bed combustion" patented technology

The invention discloses a calcination and afterburning integrated coal gangue decarbonization device. The coal gangue decarbonization device comprises a shell, a multi-channel pulverized coal combustion gun and a secondary air heating combustor, an air reversing cavity, a combustion cavity and a calcination cavity which are sequentially communicated in the gas flowing direction are formed in the shell, the air reversing cavity is provided with a secondary combustion-supporting air inlet, the combustion cavity is provided with a primary air inlet and a tertiary combustion-supporting air inlet, and the calcination cavity is provided with a coal gangue feeding port. The multi-channel pulverized coal combustion gun is inserted into the primary air inlet, and the secondary air heating combustor is arranged close to the secondary combustion-supporting air inlet. The structure of the coal gangue calcining device is simplified, the problems of material cost, air leakage, heat loss and the like of external equipment and pipelines are reduced, and the construction and operation cost of the coal gangue calcining device is reduced. Meanwhile, through the hot air chamber furnace structure adapting to fine powder combustion and the high-temperature secondary air heating process design, the problems that the low-heating-value coal gangue is difficult to ignite and the heat value cannot be released are solved, and suspension calcination of the low-heating-value coal gangue is achieved.

The invention discloses a chemical looping combustion material circulation method and chemical looping combustion equipment. The chemical looping combustion material circulation method comprises the steps that heat carrier particles and oxygen carrier particles are mixed in an air reactor, the oxygen carrier particles and oxidizing airflow are subjected to an oxidation reaction and release heat, and the heat carrier particles absorb the heat by making contact with the oxygen carrier particles; the flow speed of the oxidizing gas flow is adjusted, heat carrier particles are selectively separated out by means of the difference of the fluidization characteristics of the heat carrier particles and oxygen carrier particles, and the separated oxygen carrier particles are conveyed to a fuel reactor; heat is extracted from the separated heat carrier particles, and then the heat carrier particles are discharged or flow back to the air reactor. The invention relates to a chemical looping combustion technology, and provides a chemical looping combustion material circulation method and chemical looping combustion equipment, heat carrier particles are introduced, the heat carrier particles absorb heat released by oxidation of oxygen carrier particles and transmit the heat to a heating surface of a heat recovery structure, and effective extraction of heat in the chemical looping combustion process is achieved.

A method for producing and transferring heat The method comprises producing heat in a first thermal device (910) and heating particulate material in the first thermal device (910) and conveying a part (MIH) of the particulate material, the part (MIH) having a first temperature (T1), from the first thermal device (910) to a mixing unit (100). The method comprises conveying a part (MIC) of particulate material, the part (MIC) having a second temperature (T2), from a second thermal device (920) to the mixing unit (100) and mixing the part (MIH) of the particulate material coming from the first thermal device (910) with the part (MIC) of the particulate material coming from the second thermal device (920) in the mixing unit (100) to form particulate material having a third temperature (T3). The method comprises conveying at least a part (MOH) of the particulate material having the third temperature (T3) from the mixing unit (100) to the second thermal device (920). A system for the same. A mixing unit suitable for the method.

To provide a fluidized furnace dispersion plate and a fluidized furnace including the same, which eliminate the need for maintenance and repair of a plurality of nozzles, are lightweight, and can be easily replaced partially, thereby improving maintenance and repair efficiency and minimizing maintenance and repair time, thereby improving the operation rate and efficiency of the fluidized furnace. [Solution] The fluidized furnace distribution plate of the present invention is a fluidized furnace distribution plate located inside a fluidized furnace for reducing fine ore, and is characterized in that it includes a plurality of support beams that cross the interior of the fluidized furnace and are supported on the inner wall of the fluidized furnace, and a plurality of grid plates welded to the plurality of support beams to form a single distribution plate.

The invention provides an air cap anti-backflow device for a circulating fluidized bed boiler, belongs to the technical field of boiler combustion air distribution structures, and can at least partially solve the problems of low plugging efficiency, difficulty in ensuring coverage rate and poor sealing effect when an existing air cap is temporarily and physically plugged, or difficulty in sealing due to adoption of an inclined hole and increase of orifice resistance. In order to solve the problems that slag leakage speed and amount are reduced to a certain extent, and backward flowing cannot be fundamentally blocked, the air cap comprises an air cap body and a plugging assembly, the plugging assembly comprises a valve seat, a valve element and an elastic piece, the plugging assembly is arranged in each air outlet hole of the air cap body, and by means of mutual restriction of primary air pressure and elastic pre-tightening force, the air outlet holes of the air cap body can be effectively blocked. The valve element is automatically opened under the action of primary air pressure when the boiler normally operates and is automatically closed under the action of the elastic piece when the boiler is shut down or the primary air pressure is reduced to be lower than the preset opening pressure, active prevention of bed material backward flowing at the moment of boiler shut down is achieved, and the risk of serious dust accumulation and blockage of an air chamber is eliminated.

The invention provides a fluidized bed combustion system and a combustion method. The fluidized bed combustion system comprises a fluidized bed combustion reaction device and a mild gasification reaction device, the fluidized bed combustion reaction device comprises a dilute-phase region arranged in the middle and a dense-phase region arranged at the lower part; a gas phase outlet of the mild gasification reaction device is connected with a gas phase inlet of the dilute phase zone, and a solid phase outlet of the mild gasification reaction device is connected with a solid phase inlet of the dense phase zone. The system is stable in combustion, high in denitration efficiency, compact in structure, easy and convenient to operate, low in operation cost and suitable for low-nitrogen transformation and new projects of coal and biomass combustion devices, and has good industrial application prospects and popularization value.

The present application belongs to the technical field of biomass boiler, in particular to a circulating fluidized bed boiler tail flue fly ash conveying system, which comprises a bin pump and a fly ash conveying pipeline, the bin pump is arranged at the bottom of the discharge pipe of the tail flue ash bucket; a flow zone is arranged at the middle part of the discharge pipe, a flow bin is arranged inside the flow zone, and the flow bin is communicated with the bin pump through a mixing pipe arranged at the middle part; the accumulated ash and the airflow are mixed in advance to form a gas-solid mixture which is sent into the bin pump and flows to the ash storage, so that the flowability of the ash is improved, the short-time concentrated release of the ash is converted into the continuous release of the gas-solid mixture, and the load on the bin pump is reduced; and the process of forming the gas-solid mixture from the accumulated ash expands the gap between the cinder, so that the cinder is diffused, the excessive concentration of the cinder through the bin pump is avoided, the blockage of the upper opening or the valve of the bin pump is avoided, the failure rate of the bin pump is reduced, and the smooth transfer of the accumulated ash of the boiler tail flue is ensured.

Provided are a pulverized coal boiler with a bottom combustor, and a control method for the pulverized coal boiler, wherein the pulverized coal boiler includes a furnace, at least one bottom combustor and a secondary air distributing device. Each combustor is provided with a combustor spout, and the secondary air distributing device surrounds the combustor and is arranged at the bottom of the furnace. The secondary air distributing device includes an internal secondary air distributing device and an external secondary air distributing device, wherein the internal secondary air distributing device includes an internal secondary air gathering box and an internal secondary air pipe, and the external secondary air distributing device includes an external secondary air gathering box and an external secondary air pipe.

The embodiment of the invention discloses a solid waste bottom slag waste heat utilization circulating fluidized bed boiler system which comprises a boiler body and an air-water slag cooler, the boiler body is provided with a discharge port and an air return port, the discharge port is used for discharging high-temperature bottom slag outwards, the air return port is used for conveying air into the boiler body, and the air-water slag cooler is used for cooling the air-water slag cooler. The air-water slag cooler comprises a shell and an economizer, the shell communicates with the discharge outlet so as to be used for receiving high-temperature bottom slag discharged from the boiler body, and the shell is provided with an air inlet so as to be used for conveying air into the shell; the economizer is arranged in the shell and used for recycling flue gas waste heat emitted by the high-temperature bottom slag and can convert air conveyed into the shell into hot air, and the hot air converted by the economizer can be circularly conveyed into the boiler body through the air return opening. According to the circulating fluidized bed boiler system utilizing the waste heat of the solid waste bottom slag, waste of heat energy is reduced by recycling the waste heat of the high-temperature bottom slag, and the overall heat efficiency of the boiler is improved.

Invention relates to a method of monitoring a process of circulation of solid ma-terial in a circulating fluidized bed reactor (10) comprising at least the following steps: selecting process variables of the process of circulating of solid material in the return path (15) of solid material, and selecting performance indicators of the process of circulation of solid material amongst the selected process varia-bles for each performance indicator of the process of circulation of solid material; creating a multivariate model for each performance indicator, using history data of the process variables and the performance indicators of the process of circu-lation of solid material; determining a modelled value of the performance indica-tors, by applying current measured values of the process variables to the multi-variate model; and comparing the modelled value of each performance indicator to a respective measured value of each performance indicator and inspect pres-ence of an anomaly between the modelled value and the measured value. The method provides an effect by means of which possible problems in circulation of solid material can be effectively foreseen so that remedial actions can be taken early enough to maintain the process operational. Invention relates also to a con-trol system (48) for monitoring a process of circulation of solid material in a cir-culating fluidized bed reactor (10).

The cyclone separation device of the circulating fluidized bed boiler comprises a separator body, a filter screen, a cleaning mechanism and a rotating mechanism, an air outlet pipe is arranged at the top of the separator body, the filter screen is connected into the air outlet pipe in a penetrating mode, the cleaning mechanism comprises a cleaning brush arranged at the bottom of the filter screen, and a rotating plate is arranged at the bottom of the cleaning brush. The rotating mechanism is used for rotating the cleaning brush; the cleaning brush is used for cleaning the filter screen; the rotating mechanism comprises a rotating shaft and a rotating motor. The rotating shaft is fixedly connected to the top of the rotating plate. Through the design of the filter screen, the cleaning brush, the rotating plate and the rotating mechanism, the arranged filter screen is annular and is fixedly connected into the air outlet pipe in a penetrating and inserting mode, the filter screen is used for blocking objects carried in wind and reducing discharged objects in the using process, and when the objects carried in the wind block the filter screen, the cleaning brush is used for cleaning the filter screen. And the rotating mechanism drives the rotating plate and the cleaning brush to clean the filter screen, so that the condition that gas cannot penetrate through the filter screen is avoided.

A slag screening and crushing device. Current screening and crushing are separate devices requiring conveying equipment, and can only crush one particle size of slag at a time. This invention includes: a screening device and a crushing device. The crushing device is fixed to one side of the screen outlet of the screening device. The crushing device includes a crushing chamber containing two crushing rollers connected by bearings. The two crushing rollers are stepped crushing rollers. Two middle baffles and two side baffles are fixed inside the crushing chamber, dividing it into three crushing spaces. The screening device includes a screen box containing a screen plate. Two slag-blocking plates are fixed inside the screen box, dividing it into three slag-screening spaces. This invention is used for slag screening and crushing.

The invention discloses a biomass and coal coupled combustion system and method.The biomass and coal coupled combustion system comprises a pyrolysis reactor used for pyrolyzing biomass raw materials to generate biomass charcoal and pyrolysis gas, the pyrolysis reactor is provided with a first feeding port and a first discharging port, and the first feeding port is used for feeding the biomass raw materials; the preheating device is arranged on the pyrolysis reactor and is used for preheating the pyrolysis reactor; the combustion furnace is provided with an air inlet, a second feeding port and a coal feeding port, the second feeding port and the air inlet are both communicated with the first discharging port, and the coal feeding port is used for feeding coal. According to the biomass and coal coupling combustion system, the raw material range of biomass and coal coupling combustion can be effectively expanded, the biomass fuel treatment cost is reduced, and the coupling combustion stability and combustion efficiency are improved.

The utility model relates to the technical field of air cap structures, in particular to an anti-abrasion air cap which comprises a bottom pipe, the top end of the bottom pipe is fixedly connected with an air cap, the air cap comprises an outer cover and a connecting pipe fixed with the outer cover, a plurality of groups of side holes are formed in the side wall of the outer cover, and the side holes are fixedly connected with a branch pipe; the connecting pipe is fixed at the bottom end of the outer cover, and the inner side wall of the connecting pipe is meshed and fixed with the outer side wall of the bottom pipe; the side holes are formed in the outer cover at equal intervals in an array mode, openings of the branch pipes face the bottom and are parallel to the bottom pipe, a user can disperse the airflow direction in the hood through the branch pipe structures through the formed side holes and the branch pipe structures, the airflow pressure can be firstly improved through the obliquely-arranged branch pipe structures, and large particulate matter can be left in the outer cover; the problem of blockage is reduced, airflow flowing back to the air inlet cap is effectively prevented from directly scouring the outer wall of the air inlet pipe, abrasion of the outer wall of the air inlet pipe is avoided, and the service life of the air inlet pipe is prolonged.

The application belongs to the technical field of electric digital data processing, and particularly relates to a circulating fluidized bed boiler nitrogen oxide control optimization operation method and system. The circulating fluidized bed boiler nitrogen oxide control optimization operation method comprises the following steps: obtaining particle formation of a particle swarm based on a particle swarm algorithm; calculating the fitness of each particle according to a target function; obtaining a historical best cost vector and a population minimum cost vector; calculating the position vector and the velocity vector of the particle after iteration; obtaining the operation parameters and the cost of the corresponding circulating fluidized bed boiler and denitration device according to the position vector of the particle after iteration, and setting the operation parameters. The application automatically finds the optimal operation parameters of the circulating fluidized bed boiler and the denitration device through the particle swarm algorithm, fully considers the coupling effect of boiler combustion and tail denitration in the calculation, and can reduce the coal consumption of the circulating fluidized bed boiler and the consumption of the denitration agent under the given load and the demand of nitrogen oxide emission concentration, so as to minimize the operation cost.

The utility model discloses a detachable wind cap, which relates to the technical field of wind caps, and comprises a seat body, a sleeve and a wind cap, a through hole extending in the vertical direction is formed in the base body. The sleeve comprises a connecting part and a supporting part. The technical scheme provided by the utility model has the technical effects that the air holes in the outer side wall of the air cap and the circulating cavity formed by the through hole, the sleeve and the air cap are adopted, so that air can enter and exit, the air required by the boiler can be met, and the flowing cavity can also prevent things in the boiler from flowing back. By adopting the detachable arrangement mode of the air cap, a user or a maintainer can conveniently take down the air cap from the sleeve to clean or replace the air cap, so that the situation that dust, dirt or other sundries are accumulated in the air cap and the air holes due to long-time use, so that the ventilation effect is influenced is avoided, and the flexibility is improved.

The invention discloses a cooperative control method and device for multiple fluidized bed boilers and a medium, and is applied to the field of advanced process control. The method comprises the following steps: acquiring a pressure change rate corresponding to a mother pipe pressure signal; determining a load adjusting instruction corresponding to the boiler according to the pressure change rate and the absolute value, and determining a corresponding load adjusting quantity according to the pressure change rate and boiler performance parameters corresponding to the boiler; and if the absolute value of the second derivative of the pressure change rate is not smaller than a decoupling threshold value in the process that the boiler carries out load adjustment according to the load adjustment instruction and the load adjustment quantity, corresponding air-coal decoupling compensation operation is determined according to the second derivative of the pressure change rate, and cooperative control is carried out based on the air-coal decoupling compensation operation and load adjustment. According to the method, the mother pipe pressure signal belongs to a feedforward signal in the boiler operation process, and compared with post feedback, the response speed is increased, and the response precision is improved. And the air-coal decoupling compensation operation and the load regulation are cooperatively controlled, so that the quality, the safety and the economy are improved.

The utility model provides a kind of cold slag machine with pressing mechanism, and the purpose is to solve the technical problem that present disc type cold slag machine surface layer hot slag cannot be fully cooled without turning over.The technical scheme used is: a kind of cold slag machine with pressing mechanism, including multiple annular water chambers arranged along vertical direction, and the water chamber is provided with the discharge channel that is communicated with its upper and lower surfaces;The upper surface of the water chamber is provided with inner and outer material baffle plates;The upper surface of the water chamber is provided with a pushing mechanism and a pressing mechanism, and the pushing mechanism is composed of multiple material scraping plates uniformly distributed on the upper surface of the water chamber;The pressing mechanism is composed of multiple compression rollers extending along the radial direction of the water chamber, and at least one compression roller is provided between every two adjacent material scraping plates;The compression roller is adapted with a driving device, and the pressing mechanism and the material scraping plate move synchronously along the circumferential direction of the water chamber.

This invention relates to the field of solid waste resource utilization and clean energy technology, specifically providing a cogeneration system and method based on pure combustion of extremely low calorific value coal gangue. The system includes a pretreatment unit, a pure combustion and activation unit, an alumina extraction unit, an energy recovery unit, and a resource utilization unit connected in sequence. The core of the method lies in: feeding extremely low calorific value coal gangue with a calorific value as low as 2300 kJ / kg into a circulating fluidized bed designed based on multiple regeneration and a combustion chamber without heating surfaces, without adding any high calorific value fuel, to achieve stable pure combustion and low-temperature activation at 850-900℃, generating highly active ash slag with an alumina activity index of not less than 79.6%; subsequently, alumina is extracted by acid extraction, and waste heat is simultaneously recovered for power generation and heating; finally, the white mud produced from alumina extraction is used to prepare silicon fertilizer or building materials, and the process wastewater is converted into chemical products such as dust suppressants and passivating agents. This invention is the first to achieve large-scale pure combustion of extremely low calorific value coal gangue, completely eliminating the dependence on high-quality coal and realizing the high-value utilization of all components, resulting in significant environmental and economic benefits.

This invention provides a method, apparatus, and equipment for predicting the amount of hydrated lime input outside the furnace in a two-stage combined desulfurization process, relating to the field of desulfurization control technology. The method includes: acquiring desulfurization operating parameters, including coal quality characteristics, the amount of limestone input in the boiler, the actual amount of hydrated lime input in the desulfurization tower, the actual SO2 concentration at the boiler outlet, and the actual SO2 concentration at the desulfurization tower outlet; using the desulfurization operating parameters as input, determining the desulfurization operating condition category corresponding to the desulfurization operating parameters through a pre-trained desulfurization operating condition prediction model; and calling the hydrated lime input prediction model corresponding to the determined desulfurization operating condition category, using the amount of limestone input in the boiler, the actual SO2 concentration at the boiler outlet, and the pre-determined target SO2 concentration at the desulfurization tower outlet as input, and predicting the target amount of hydrated lime input in the desulfurization tower through the hydrated lime input prediction model. This invention is based on modeling for combined in-furnace and out-of-furnace desulfurization, realizing the prediction of the amount of hydrated lime input outside the furnace.

The utility model provides an anti-falling structure for a partition wall of a boiler return feeder, which relates to the technical field of circulating fluidized bed boilers and comprises a boiler wall, a hexsteel, an anchor rod, a first connecting component and a second connecting component. According to the anti-falling structure for the partition wall of the boiler return feeder, the spliced hexsteel integrally covers the boiler wall, and the anchor rod penetrates through the center holes of the semicircular cylinder I and the semicircular cylinder II. And the threaded connecting cylinders are sequentially screwed into the first threaded cylinder and the second threaded cylinder and gradually tightened until the deep positions in the threaded connecting cylinders are matched with threads on the outer side of the end of the anchor rod, the hexsteel is prevented from being disengaged in the axis direction of the anchor rod, the hexsteel is tightly attached to the surface of the furnace wall, and no loosening gap exists between the meshes. The surface of the hexsteel is coated with the refractory material, the polygonal holes and the protrusions which are densely distributed on the surface of the hexsteel form abundant gap intervals, the polygonal holes and the protrusions are integrated through the physical embedding effect, and the refractory material is effectively prevented from being layered or falling off due to thermal expansion and cold contraction, material scouring and the like.

The invention relates to a circulating fluidized bed (CFB) stock boiler. According to the reconstruction and transformation method of the boiler, during transformation, the original boiler barrel, hearth and vertical shaft main body structures of the boiler are kept unchanged, and only a cyclone separator and a material returning system of the original boiler are omitted. The space between the rear wall of the hearth and the front wall of the vertical shaft is transformed into a two-return-stroke flue, a three-return-stroke flue and an auxiliary combustion chamber, and the structure has the function of integrating gas-solid separation, radiation heat transfer and boiling combustion; after transformation, the output can be obviously increased, the original output can be maintained, the material flow, flow velocity and flow resistance of the main combustion chamber can be reduced, the material internal circulation amount in the furnace is improved, and the fuel burnout degree is improved. The method is high in transformation efficiency, small in project amount, low in cost and short in period; after transformation, the pain points of high flow resistance, high failure rate and the like of the separator and a material returning system are thoroughly eliminated; the power utilization rate of the boiler can be reduced by 30%-50%, the operation and maintenance cost can be reduced by 70%-90%, the reliability, stability and heat efficiency of boiler operation are remarkably improved, the initial smoke emission concentration is greatly reduced, and the method is suitable for transformation of various CFB boilers in active service.

The application discloses a wind distribution device for a circulating fluidized bed boiler, which comprises a wind chamber, a wind distribution part, an adjustable baffle and a driving device. The wind chamber comprises a wind distribution area and a wind guide area, the wind distribution area is arranged above the wind guide area, and the wind distribution area is in communication with the wind guide area. The wind distribution part is arranged on the top of the wind distribution area. The adjustable baffle is rotatably connected to the top of the wind guide area. The driving device is connected to the adjustable baffle and drives the adjustable baffle to rotate so as to adjust the wind volume entering the wind distribution area. The air inlet is arranged on at least one side of the wind guide area. Thus, the wind volume entering each area of the furnace of the circulating fluidized bed boiler can be quantitatively controlled by arranging the adjustable baffle on the device, and the fluidization state of the bed material in each area can be differentially adjusted, so that the operation problems, such as poor fluidization of the bed material, high local bed temperature, coking and partial bed, are solved. Meanwhile, the device has the advantages of simple operation and low installation and maintenance cost.

The invention discloses an SNCR (selective non-catalytic reduction) denitration agent reduction method for a large-scale circulating fluidized bed boiler, which comprises the following steps of: adjusting primary and secondary air rates, adjusting upper and lower secondary air and adjusting flue gas recirculation in the operation process of the large-scale circulating fluidized bed boiler in a boiler starting period, a load increasing period, a load stabilizing period and a load reducing period; and the average oxygen content of the boiler is controlled to be 2.5-3.5%, and the single-point oxygen content is not allowed to be lower than 2%. And the original emission of boiler nitrogen oxide indexes is reduced, so that the input amount of the required denitration agent is reduced.

The invention provides an optimized circulating fluidized bed boiler flue gas denitration system, which belongs to the technical field of flue gas denitration, and comprises a boiler, a cyclone separator group, a preheater, a dust remover, an induced draft fan, a chimney, a material returning device, an air chamber, an injection system and a flue gas recirculation device, the cyclone separator group comprises a plurality of cyclone separators; the injection system comprises a static mixer, a first spray gun group and a second spray gun group; and the flue gas recirculation device comprises a recirculation fan and a primary fan. Based on the difference between the inlet and the outlet of the cyclone separator, the ultra-low emission requirement is met through SNCR (selective non-catalytic reduction) dynamic partition injection, flue gas recirculation variable load self-adaption and coal quality-denitration advanced linkage; the problem of NOx fluctuation under variable load and variable coal quality is solved.

The invention belongs to the technical field of electrical digital data processing, and particularly relates to a circulating fluidized bed boiler nitrogen oxide control optimization operation method and system.The circulating fluidized bed boiler nitrogen oxide control optimization operation method comprises the steps that based on a particle swarm algorithm, particles are obtained to form a particle swarm; calculating the fitness of each particle according to the target function; obtaining a historical optimal cost vector and a population minimum cost vector; calculating a position vector and a velocity vector of the particles after iteration; according to the position vectors of the particles after iteration, obtaining operation parameters and costs of the corresponding circulating fluidized bed boiler and the denitration device, and setting the operation parameters; according to the method, the optimal operation parameters of the circulating fluidized bed boiler and the denitration device are automatically searched through the particle swarm optimization, meanwhile, the effect of boiler combustion and tail denitration coupling is fully considered in calculation, the coal consumption of the circulating fluidized bed boiler and the consumption of the denitration agent can be reduced under the requirements of given load and nitrogen oxide emission concentration, and the system reliability is improved. And the operation cost is lowest.

The invention relates to the technical field of garbage incinerator devices, in particular to a CFD garbage incinerator for improving the combustion efficiency through primary air and secondary air. The system comprises a garbage incinerator, a comburent feeder arranged on one side of the garbage incinerator, a cyclone separator, a smoke dust remover, filtering and cooling equipment, a chimney and a bottom ash cooler arranged at the lower end of the garbage incinerator, wherein the cyclone separator, the smoke dust remover, the filtering and cooling equipment and the chimney are sequentially arranged on the other side of the garbage incinerator; the blast layer, the lower fluidization layer and the crushing fluidization layer are arranged in the garbage incinerator, primary air is introduced into the blast layer to blow comburent entering the garbage incinerator, so that the comburent is subjected to fluidization combustion in the lower fluidization layer, and secondary air drives the comburent to enter the crushing fluidization layer to be crushed and dispersed. The crushing assembly is used for crushing, dispersing and mixing comburent, the uniformity and stability of the waste incineration fluidization state are maintained, it is guaranteed that the comburent is fully combusted, and the combustion efficiency is improved.

The invention provides a circulating fluidized bed boiler system which comprises a boiler, a backflow device, a rotating shaft body and an intercepting device. The boiler is used for accommodating and combusting raw materials; the backflow device is arranged outside the boiler and communicates with an inner cavity of the boiler; the rotating shaft body is rotationally arranged in the boiler; the intercepting device is arranged in the boiler and arranged outside the rotating shaft body in a sleeving manner; the backflow device is used for separating gas and combustion particles in the flue gas and enabling the separated combustion particles to flow back into the boiler; the backflow device is further used for introducing airflow into the boiler so that an inner cavity of the boiler can be in a fluidized state. The intercepting device is used for rotating under the driving of the rotating shaft body to collect combustion particles in the boiler, and the combustion particles are prevented from being rapidly discharged out of the boiler along with fluidized airflow. Thus, combustion particles and heat in gas flowing out of the boiler can flow back to the boiler, the combustion particles are collected through the intercepting device and prevented from being discharged along with airflow, the situation of incomplete combustion can be reduced, and the combustion efficiency and the utilization efficiency of raw materials are improved.

A method for providing abrasive grains (CG1, CG2, CG3, CG4) comprises: - providing first input material (FEED1), which comprises abrasive grains (G0) adhered to a combustible substrate (BASE0), and - separating the abrasive grains (G0) from the substrate (BASE0) by at least partly combusting the substrate (BASE0) in a fluidized bed (BED1).