796results about "Fluidized bed combustion" patented technology

The invention discloses a circulating fluidized bed combustion reduced-order prediction method based on enhanced compressed sensing and a time convolutional neural network. In the off-line preparation stage, firstly, original variable information in a multi-phase combustion field is obtained, the time average value of grid variables is calculated, and a result snapshot matrix is decentralized in time; and obtaining a POD mode and a corresponding mode coefficient thereof, and obtaining the optimal arrangement positions of the time convolutional neural network and the sensor. In the online prediction stage, the modal coefficient at the current moment is reconstructed based on the position of the sensor, the future modal coefficient is predicted based on the time convolutional neural network, and the flow field is reconstructed through linear combination with the POD modal. According to the method, on-line rapid prediction of full-field variables at the future moment is realized by utilizing sparse sensor data at the current moment, the defect that a traditional CFD method cannot be applied to industrial production rapid prediction is overcome, and the blank of multiphase combustion in the circulating fluidized bed in the aspect of on-line flow field rapid prediction is filled.

The invention relates to a NOx emission concentration prediction system for a circulating fluidized bed boiler. The system comprises a data acquisition and dynamic feature construction module of a distributed sensor network, which realizes multi-dimensional characterization of a combustion state through space-time coupling analysis; according to the hybrid prediction model, a double-layer architecture is adopted to decouple a static combustion rule and a dynamic delay effect, and the prediction precision is improved by utilizing stable output of a base layer and self-adaptive compensation of a correction layer; the closed-loop control module is used for forming a synergistic effect of feedforward and feedback based on an intelligent decision-making mechanism of a working condition mapping model so as to avoid control overshoot; and the health guarantee module constructs a triple protection system, so that the data reliability is ensured, and redundancy protection can be realized under a fault working condition. According to the method, high-precision prediction and real-time control of NOx emission of the coal-fired unit in the full working condition range can be achieved, and the stability and the environmental protection performance of boiler operation are remarkably improved.

The invention relates to a chemical looping combustion device of a coupling heat exchanger and a using method of the chemical looping combustion device. The chemical looping combustion device comprises an air reactor and a fuel reactor. The air reactor is provided with a top discharge port, and the fuel reactor is provided with a lower overflow port; the chemical looping combustion device further comprises a return feeder with an inlet and a first outlet, the inlet is communicated with the overflow port, and the first outlet is communicated with the air reactor through the fluidized bed heat exchanger. According to the chemical looping combustion device, flexible control over the temperature of the air reactor is achieved by conveniently and flexibly controlling the amount of materials entering the fluidized bed heat exchanger. According to the chemical looping combustion device, by arranging the fluidized bed heat exchanger, heat in the chemical looping combustion device is safely and effectively recycled, and the problems that a conventional heating surface arranged in an air reactor is prone to abrasion, and the efficiency of a wear-resistant heating surface is low are solved.

The invention relates to a circulating fluidized bed boiler system, comprising: a main circulating fluidized bed boiler comprising a main hearth, a main separator, a main return feeder and a flue; the activation and modification device comprises a coal slime inlet and a gas-solid fuel outlet, the coal slime is suitable for being at least partially gasified and combusted in the activation and modification device to form gas-solid fuel flowing out of the gas-solid fuel outlet, and the gas-solid fuel outlet is communicated with a fuel nozzle arranged in the main hearth. The invention further relates to a coal slime activating treatment method which comprises the following steps: at least part of coal slime is gasified and combusted in the activating and modifying device to generate gas-solid fuel; and gas-solid fuel is led to the middle lower part of the hearth of the circulating fluidized bed boiler. The scheme can be used for flexible peak regulation of the boiler.

The invention discloses an industrial waste circulating fluidized bed feeding control method based on a stock bin image, and the method comprises the steps: obtaining a fuel image in a stock bin through a monitoring camera with light supplement, building a fuel region recognition model through a semantic segmentation algorithm, and obtaining a stock bin material level recognition method. A feeding amount calculation model is established by using feeding amount data under different material levels, different revolution motor controller frequencies and different spiral motor controller frequencies, and the optimal revolution motor controller frequency and the optimal spiral motor controller frequency are output in real time by taking stable feeding as a target. Therefore, the standard feeding amount can be updated in real time, meanwhile, the optimal control scheme under the current material level is optimized in real time, equipment is automatically controlled, and the automation degree of feeding is improved.

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 method for intelligently controlling sulfur dioxide emission in a circulating fluidized bed flue gas desulfurization process. The method at least comprises the following steps: 1) automatically controlling the outlet temperature of the desulfurizing tower; (2) intelligently controlling the bed pressure drop of the desulfurizing tower; and (3) intelligently controlling the emission concentration of SO2. Wherein 1) the step of automatically controlling the temperature of the outlet of the desulfurizing tower is realized by automatically adjusting a backflow adjusting valve of a process water system, and 2) the step of intelligently controlling the pressure drop of the bed of the desulfurizing tower is realized by intelligently adjusting a material returning adjusting valve. According to the method, multi-factor controlled desulfurization emission is subjected to hierarchical control and system interlocking, all factors are automatically controlled, production parameters are optimized through interlocking of all the factors, and finally the purpose of multi-factor intelligent control over SO2 emission is achieved.

The invention discloses a variable-load chemical looping combustion system which comprises an air reactor, a fuel reactor, a feeding loop and a material returning loop. An industrial steam supply heating surface A is arranged in the air reactor, and 1-N load regulators are connected in parallel between the air reactor and the fuel reactor; each load regulator comprises a furnace body, a fluidization device arranged in the furnace body, a gas inlet connected with the furnace body below the fluidization device, a gas outlet connected with the furnace body above the fluidization device, oxygen carrier inlet pipes and oxygen carrier outlet pipes, the oxygen carrier inlet pipes are connected with the fuel reactor and are provided with regulating valves, and the oxygen carrier outlet pipes are connected with the air reactor; an industrial steam supply heating surface B is arranged in the furnace body above the fluidizing device; the invention further discloses a using method of the variable-load chemical looping combustion system. According to the invention, the load can be flexibly and stably adjusted in a wide range, meanwhile, negative effects caused by cooling of the reaction area and reduction of the activity of the oxygen carrier are avoided, and efficient and reliable operation of the chemical looping combustion system under the wide-load working condition is ensured.

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.

The invention discloses a low-load flue gas recirculation system for a circulating fluidized bed boiler. The low-load flue gas recirculation system comprises a hearth, and one end of a fifth pipeline is fixedly connected to the hearth; according to the invention, a part of flue gas is led out from the opening of the outlet flue of the induced draft fan and is introduced into the fourth pipeline, primary air heated by the first fan heater and the second fan heater is mixed, then pressurized by the first primary air fan and the second primary air fan and heated by the first preheater and the second preheater, and then enters a boiler air chamber; a dynamic parameter adjusting mechanism in the self-adaptive adjusting system adopts a feedforward-feedback composite control structure, the reheating steam temperature can be increased by about 2 DEG C every time the recirculation air volume is increased by 1%, the NOx concentration fluctuation is predicted in real time by applying an LSTM neural network, PID parameters are dynamically corrected through fuzzy reasoning, fuel characteristic changes are adapted, and the reheating steam temperature is increased by about 2 DEG C; and the amount of recycled flue gas is properly adjusted according to the load change to ensure that the unit is in the deep peak regulation load interval, and the unit operates to realize stable ultralow emission of NOx.

According to the oxygen-enriched combustion system of the circulating fluidized bed boiler and the operation method, under the oxygen-enriched combustion working condition, part of low-temperature and clean flue gas at the tail is led back, mixed with pure oxygen and then fed into a hearth, the total in-furnace gas flow after mixing is kept equivalent to the original total in-furnace air flow, and the total in-furnace gas flow after mixing is kept equivalent to the original total in-furnace air flow; when the mixed gas entering the furnace keeps the oxygen volume concentration equivalent to or slightly higher than that of air, the problems of fluidization, combustion and heat transfer in a hearth can be completely solved, and safe, reliable, economical and environment-friendly operation of a unit can be guaranteed; after air is completely replaced by the mixed gas, the CO2 concentration in the generated flue gas is greatly improved and can reach 80% or above at most, and CO2 can be captured with low cost and high efficiency; according to the invention, free switching between air combustion and oxygen-enriched combustion can be realized.

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.

The invention relates to a pure ammonia combustion circulating fluidized bed boiler system which comprises an ammonia water storage tank, an ammonia water evaporator, a fluidized bed boiler hearth, a separator and an external heat exchange cracking device, the separator is connected with a high-temperature material inlet of the external heat exchange cracking device through a shunt branch, and the shunt branch is provided with a shunt valve; a heat exchange pipe is arranged in the external heat exchange cracking device, one end of the heat exchange pipe is used for introducing ammonia gas, and the other end of the heat exchange pipe is connected with an ammonia cracking gas inlet of a hearth of the fluidized bed boiler, so that mixed gas formed after cracking is fed into the hearth of the fluidized bed boiler; an air inlet is formed in the bottom of the external heat exchange cracking device, and a high-temperature material outlet is formed in one side of the external heat exchange cracking device, so that high-temperature materials after heat exchange return to the hearth of the fluidized bed boiler. According to the boiler system, the combustion rate of ammonia gas can be increased, it is guaranteed that the ammonia gas can be completely combusted, stable combustion of pure ammonia is achieved, pollutant generation is controlled, and the thermal power industry is assisted to achieve carbon reduction.

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.

The present application relates to circulating fluidized bed boiler technical field, specifically provide based on the load regulation control method and device of coal powder circulating fluidized bed collaborative combustion, the method includes steps, in response to the load regulation instruction of target power grid, according to preset load threshold and load regulation instruction are judged, the target working state of target boiler is determined;Load regulation instruction includes load variation and load change rate;Target boiler includes circulating fluidized bed boiler and coal powder burner;In the case where the target working state is the first state, according to load variation and load change rate, the output of circulating fluidized bed boiler and the output of coal powder burner are adjusted and controlled;In the case where the target working state is the second state, the output of coal powder burner is controlled to be preset steady-state output, and the output of circulating fluidized bed boiler is adjusted and controlled according to load variation.The present application can effectively improve the overall load change rate.

The invention relates to the technical field of boilers, in particular to a circulating fluidized bed boiler, which is provided with an SNCR (selective non-catalytic reduction) and SCR (selective catalytic reduction) combined device, the SNCR and SCR combined device comprises an SNCR device and an SCR device, the SNCR device comprises an ammonia water spray pipe arranged in an area with the temperature of 800 DEG C, ammonia water is sprayed into tail gas through the ammonia water spray pipe, the ammonia water is gasified and subjected to contact reaction with NOx, and the concentration of NOx at an outlet of a cyclone separator is controlled to be less than 40mg / Nm < 3 >. The SCR device comprises an SCR reactor arranged in an area of 320-420 DEG C, NOx and ammonia gas are subjected to catalytic reaction in the SCR reactor, the concentration of NOx is reduced to be smaller than 25 mg / Nm < 3 > under the action of a catalyst, the concentration of NOx after reaction is reduced to be 20 mg / Nm < 3 >, the content of NH3 in flue gas is 45 mg / Nm < 3 >, the NOx enters an ammonia-process desulfurization tower along with the flue gas and serves as supplement of a desulfurization agent for ammonia-process desulfurization, ammonia escape can be controlled to be smaller than 1 mg / Nm < 3 > after ammonia-process desulfurization, and the ammonia escape can be controlled to be smaller than 1 mg / Nm < 3 > after ammonia-process desulfurization. The environment-friendly emission standard is met.

The circulating fluidized bed boiler comprises a hearth, a feeding device, a material returning device, a secondary tuyere, an air distribution plate, a cyclone separator, a tail flue and a superheater, the hearth is divided into three areas including a preheating mixing area, a hearth combustion area and a hearth heat exchange area from bottom to top, refractory castable is laid in the hearth to form a heat insulation hearth, a superheater is arranged in a hearth heat exchange area on the upper portion in the hearth, and an evaporation water cooling screen is additionally arranged below the superheater in the hearth. According to the circulating fluidized bed boiler suitable for the high-coking fuel, the defects that a traditional circulating fluidized bed boiler is insufficient in combustion, prone to coking, uneven in hearth temperature distribution and the like when biomass fuel and garbage fuel are combusted are overcome, the combustion temperature and stability can be improved, coking is avoided, fluidization is more uniform, and the combustion efficiency is improved.

The invention discloses a CFB boiler system for dynamic peak regulation of high-temperature circulating ash. The CFB boiler system comprises a hearth, a separator, a material returning pipe, a hot material storage bin and a control system. One end of the material returning pipe is communicated with the particulate matter outlet of the separator, and the other end is communicated with the dense-phase area of the hearth; one end of the hot material storage bin is communicated with the particulate matter outlet of the separator through a first ash control valve, and the other end of the hot material storage bin is communicated with the material returning pipe through a second ash control valve; the control system can obtain a power grid load instruction and a CFB boiler load reduction state, the first ash control valve is opened, and the second ash control valve is closed; and in the load rising state of the CFB boiler, the first ash control valve is closed, and the second ash control valve is opened. In the load increasing process, the hot circulation ash stored in the hot material storage bin can return to the hearth along with the hot circulation ash generated in the separator, the amount of the hot circulation ash entering the hearth can be increased, the material concentration in the hearth can be increased, then heat exchange in the boiler is enhanced, and therefore the response speed in the load changing process of the circulating fluidized bed boiler can be increased.

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.

The utility model relates to a vertical fluidized bed furnace with more sufficient combustion, which is characterized by comprising a feeding machine and a vertical combustion furnace, the discharge end of the feeding machine is provided with a first conveying belt, the discharge end of the first conveying belt is provided with a lifting conveying belt, the discharge end of the lifting conveying belt is provided with a roller screen, the discharge end of the roller screen is provided with a lifting machine, and the discharge end of the lifting conveying belt is provided with a second conveying belt. The discharging end of the elevator is provided with a transfer bin, the discharging end of the transfer bin is connected with a feeding port of the vertical combustion furnace, the bottom of the vertical combustion furnace is connected with a centrifugal fan, the top of the vertical combustion furnace is connected with a cyclone dust collector, and the discharging end of the cyclone dust collector is connected with a drying tower. The combustion main furnace is arranged to be of a vertical structure, rotating airflow is added to the bottom of the combustion main furnace, large-particle coal particles are blown up to be combusted repeatedly, and the coal particles are combusted more sufficiently.

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.