553 results about "Circulating fluidized bed boiler" patented technology

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 soot blowing optimization method for an intelligent circulating fluidized bed boiler, belongs to the technical field of boiler equipment and intelligent control, and is suitable for efficient operation and maintenance of circulating fluidized bed (CFB) boilers in the industries of electric power, chemical engineering, metallurgy and the like. The method aims at solving the technical problems that real-time sensing of the soot deposition state is insufficient, and soot blowing strategy hysteresis is high. The method comprises the steps of multi-dimensional data real-time acquisition and fusion, dust deposition state intelligent prediction and decision making, closed-loop feedback optimization and adaptive adjustment, and system integration and intelligent operation and maintenance. A high-precision sensor network (including hearth temperature, flue gas parameters, heating surface temperature gradient and the like) is deployed in a key area of a boiler, an infrared thermal imaging or image recognition technology is combined to monitor an ash deposition state, and an ash deposition prediction model is constructed through a machine learning algorithm (such as LSTM, random forest and CNN). Based on real-time data and model analysis, the soot blowing frequency, strength and medium parameters are dynamically adjusted through fuzzy control or a self-adaptive PID algorithm, and accurate soot blowing is achieved.

The invention provides a visualization method and device for the combustion process of a circulating fluidized bed boiler, and the method comprises the steps: collecting the operation data of the circulating fluidized bed boiler in real time through a distributed control system at an upper computer, and storing the collected data in a CSV format; in the lower computer, a three-dimensional modeling tool is used for establishing a three-dimensional model of the solid boiler, and grid division is carried out; controlling the upper computer to generate boundary condition data of numerical simulation according to the acquired CSV data, transmitting the boundary condition data to the lower computer, and reading the latest boundary condition data by using the lower computer to perform real-time simulation calculation; performing post-processing on a simulation calculation result by utilizing the lower computer to obtain a picture and curve data, and transmitting the picture and curve data to the upper computer through a network; and the upper computer is controlled to display the visual results of the temperature field, the velocity field, the pressure field, the gas component concentration field and the ash combustible content in real time through a platform interface in the forms of static diagrams, dynamic diagrams and trend curves. According to the method, the combustion process of the circulating fluidized bed boiler can be rapidly visualized, the operation state of the boiler can be predicted, and guidance is provided for operation optimization and parameter adjustment.

The utility model discloses a circulating fluidized bed boiler system capable of realizing deep peak regulation by regulating circulating ash. The circulating fluidized bed boiler system comprises a hearth, a separator, a return feeder, an ash cooler and a tail flue, one side of the top of the hearth is provided with an outlet, the outlet is connected with a separator, the upper part of the separator is connected with a tail flue, the bottom of the separator is connected with a return feeder, the return feeder is provided with a return feeder ash discharge port, and the return feeder ash discharge port is respectively communicated with the lower part of the hearth and an ash cooler; an outlet in one side of the ash cooler is connected with the slag warehouse. According to the system, the differential pressure transmitter is used for displaying the size of the differential pressure of the hearth to feed back the circulating ash amount, and the opening degree of the ash cooler is regulated and controlled to control the circulating ash amount entering the boiler, so that the influence of inertia of materials in a circulating loop on load change is reduced, the lowest stable combustion load of the boiler is reduced, and the peak regulation capacity of the boiler is greatly improved.

The invention relates to the technical field of circulating fluidized bed boilers, in particular to an intelligent temperature control system and method for a circulating fluidized bed boiler, accurate regulation and control of boiler operation parameters are achieved through a multi-algorithm cooperative control and intelligent compensation mechanism, a model prediction control unit is based on a multivariable control matrix constructed by an ARX / FIR model, and the temperature control accuracy of the circulating fluidized bed boiler is improved. Dynamic tracks of boiler bed temperature, pressure and oxygen parameters can be predicted in real time, a multivariable coupling problem which is difficult to process in traditional PID control is converted into an optimization solution problem, control precision is improved, a neural network optimization control unit dynamically adjusts the coal feed quantity and air quantity ratio through a reinforcement learning mechanism, boiler thermal efficiency is improved, and the control precision is improved. The fuzzy control unit converts an operator experience rule into a compensation control quantity under a non-linear boundary condition, so that bed temperature overshoot and oxygen abrupt change are effectively inhibited, and the stability of the combustion process can still be kept under a variable working condition.

The invention discloses a regulation and control method for coping with accidental overrun of outlet steam pressure of a circulating fluidized bed boiler, which realizes advanced coping with the overrun of the outlet steam pressure of the circulating fluidized bed boiler and greatly avoids the overrun phenomenon. 0.001 MPa per second is defined as an accidental overrun early warning value of the outlet steam pressure change rate of the circulating fluidized bed boiler; the change rate of the steam pressure at the outlet of the circulating fluidized bed boiler is collected in real time, if the change rate of the steam pressure at the outlet of the circulating fluidized bed boiler collected in real time is larger than 0.001 MPa / s, it is pre-judged that the steam pressure at the outlet of the circulating fluidized bed boiler is about to accidentally exceed the limit, and the coal feeding flow of the boiler is adjusted by changing feedforward of a PI adjusting system of the coal feeding flow of the boiler. The purpose of rapidly adjusting the coal feeding flow of the boiler is achieved, and therefore the situation that the outlet steam pressure is about to exceed the limit accidentally is avoided.

The invention discloses a circulating fluidized bed boiler water supply optimization method and system, and belongs to the technical field of boiler energy conservation. The system mainly comprises a condensate water tank, a demineralized water tank, a slag cooler, a deoxygenization water tank, a condensate water pump, a demineralized water pump, a plate heat exchanger, a reverse osmosis membrane group, a demineralized water buffer tank and the like. The principle of'condensate water priority 'is adopted, the supply amount of condensate water is preferentially adjusted according to the liquid level of the deoxygenated water tank through the intelligent control unit, and the insufficient part is supplemented by demineralized water; the demineralized water subjected to heat exchange by the slag cooler is intelligently distributed to a demineralized water tank, a condensation water tank or a deoxygenization water tank according to the water outlet temperature; the plate heat exchanger can preheat reverse osmosis inlet water by adopting a desalting water mode or a steam mode; the demineralized water buffer tank effectively inhibits water impact. Dynamic balance and heat energy gradient utilization of steam condensate water and demineralized water are achieved, the problems of water tank overflow and energy waste are effectively solved, and the economical efficiency and stability of boiler operation are remarkably improved.

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 belongs to the technical field of additives for coal-fired boilers, and particularly relates to a coal-saving desulfurization ash-removal decoking agent applied to boilers. The coal-saving, desulfurization, ash-removal and coke-cleaning agent is prepared from the following components: a component A, a component B and a component C, wherein active components CaO, HoFeO3 and CeO2 are loaded on a carrier SrO-MgO; the component B is prepared by loading the active components MgCO3 and KNO3 on the carrier BaFe12O19; the component C is Cu-doped CoFe2O4, and the component C is Cu- The mass ratio of the component A to the component B to the component C is (5-8): (2-3): 1. The coal-saving desulfurization ash-removal coke cleaning agent can effectively save fuel, improve the sulfur fixation efficiency, reduce generation of coke scales on the furnace wall, remove old coke scales, improve the working condition of a circulating fluidized bed boiler and greatly reduce the operation and maintenance cost of the circulating fluidized bed boiler.

The application belongs to the technical field of refractory materials, and particularly relates to a corundum castable special for a circulating fluidized bed boiler and a preparation method thereof. The raw materials of the castable include 20-50 parts of white corundum particles with a size of 3-5 mm, 5-10 parts of alpha-alumina micropowder, 2-5 parts of microsilica, 1-5 parts of a binder, 0.5-1 part of a water reducing agent, and 1-5 parts of SiC-ZrB2 / chitosan quaternary ammonium salt modified graphene composite material. The castable has the properties of low apparent porosity, good mechanical properties, strong corrosion resistance and the like.

The invention discloses a real-time control method and system applied to combustion of a circulating fluidized bed boiler, and relates to the technical field of circulating fluidized beds, and the real-time control method comprises the following steps: arranging a plurality of temperature monitoring points in a bed layer and installing a thermocouple device to realize real-time monitoring and recording of the bed temperature; identifying and analyzing a plurality of indexes influencing the bed temperature, and respectively fitting influence functions on the bed temperature and the stabilization time when each index is increased or decreased by utilizing a control variable method and a least square method; the system monitors the temperature change of each point in real time, compares the temperature change with a preset normal temperature range, and flexibly adopts a single-monitoring-point or multi-monitoring-point adjustment strategy for abnormal monitoring points; the single monitoring point strategy determines an optimal adjustment scheme by screening an influence function; the multi-monitoring-point strategy focuses on searching public indexes and adjusting modes, and comprehensive optimization is achieved in combination with a single-point strategy; through intelligent decision making of the temperature adjusting process of the circulating fluidized bed, accurate and real-time control over combustion of the circulating fluidized bed boiler is achieved.

The invention provides a circulating fluidized bed boiler load self-adaptive control system and method, and belongs to the technical field of circulating fluidized bed boiler load self-adaptive control. In order to realize in-boiler temperature regulation based on dynamic conveying of settled ash in a boiler and realize efficient active matching of heat transfer capability in a quick response load process of the boiler, the technical scheme is that the top of a hearth of the circulating fluidized bed boiler is communicated with the top of a cyclone separator through a coal ash recovery pipeline, and the top of the cyclone separator is connected into a tail flue; an economizer is arranged in the middle of the tail flue, and a flue outlet is formed in the bottom of the tail flue; the bottom of the cyclone separator is connected with a circulating ash returning device through an outlet pipeline, a settled ash conveying hole is formed in the upper part or the side part of the circulating ash returning device, and a conveying pipeline is welded on the outer side of the settled ash conveying hole and is connected with the bottom of a hearth of the circulating fluidized bed boiler; the method is used for self-adaptive control of the load of the circulating fluidized bed boiler.

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.

The invention relates to the field of low-carbon combustion of circulating fluidized bed boilers, in particular to an oxygen carrier reinforced ammonia-doped carbon-reducing combustion system and method for a circulating fluidized bed boiler, ammonia gas and combustion-supporting air are introduced into a hearth with pulverized coal and an oxygen carrier, the oxygen carrier circulates in the hearth in a reciprocating mode under the action of the combustion-supporting air and the gravity of the oxygen carrier, and in a dense-phase bed layer in the hearth, the combustion-supporting air and the oxygen carrier are mixed in the hearth. The oxygen carrier in the oxidation state uses combined oxygen of the oxygen carrier in the oxidation state for oxidation of ammonia and is partially converted into the oxygen carrier in the reduction state, the oxygen carrier in the reduction state catalyzes and decomposes the ammonia to generate hydrogen, and meanwhile NOx emission is controlled; in the dilute-phase bed layer in the hearth, the oxygen carrier in the oxidation state catalyzes and oxidizes ammonia to promote combustion of the ammonia-coal fuel, the internal oxygen distribution condition of the circulating fluidized bed boiler can be improved, and the combustion efficiency of the ammonia-coal fuel in the ammonia-doped combustion circulating fluidized bed boiler is improved.

The utility model discloses a circulating fluidized bed boiler suitable for high-alkali and high-chlorine coal. The circulating fluidized bed boiler comprises a hearth, a cyclone separator, a steam cooling flue and a tail flue which are connected in sequence, a water cooling screen is arranged in the hearth; the lower end of the cyclone separator is connected with a material returning device, the material returning device is connected with the lower part of the hearth through a first-stage material returning pipe and connected with an external bed through a connecting pipe, a high-temperature superheater is arranged in the external bed, and the external bed is connected with the lower part of the hearth through a second-stage material returning pipe; the steam cooling flue is divided into a steam cooling down flue and a steam cooling up flue through a longitudinal partition wall connected with the top of the steam cooling flue, and a water cooling tube bundle is arranged in the steam cooling up flue; according to the utility model, contamination and corrosion of high-alkali and high-chlorine coal for combustion to a heating surface can be prevented, damage to equipment in the boiler is avoided, and long-period stable operation of the boiler is realized.

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.

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 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.

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 invention discloses a precise control method for stabilizing the steam pressure of an outlet of a circulating fluidized bed boiler, and solves the technical problem of overshoot or undershoot when the coal feeding amount is regulated and controlled by an outlet steam pressure PID system of the circulating fluidized bed boiler in an existing combined heat and power generation thermal power plant along with the steam pressure. A traditional PID regulation and control mode with the steam pressure of an outlet of the circulating fluidized bed boiler as a regulation and control target is changed, the steam quantity of the outlet of the circulating fluidized bed boiler is directly and accurately regulated by soft measurement of internal factors of coal types and external factors of thermal loads in advance, by means of the steam quantity per ton of coal and by regulating and controlling the coal feeding quantity of the circulating fluidized bed boiler, and the steam quantity of the outlet of the circulating fluidized bed boiler is accurately regulated and controlled. Particularly, the stability of the steam pressure at the outlet of the circulating fluidized bed boiler is realized by feeding coal according to the pre-coal feeding amount and a reasonable coefficient of soft measurement.

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.

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 discloses a waste mash and slurry blending combustion system of a circulating fluidized bed boiler with lignin residues as fuel. An effective treatment and utilization way is explored for harmless combustion treatment of waste mash and slurry. Aiming at the characteristics that the circulating fluidized bed boiler takes lignin residues as fuel and high-concentration waste mash slurry needs to be mixed and combusted in a hearth for combusting the lignin residues, the ignition sequence of the circulating fluidized bed boiler, the opportunity for adding the mixed-combusted waste mash slurry into the hearth and the control of the doping amount are explored through a plurality of tests; meanwhile, a blending combustion conveying system suitable for blending combustion of waste mash thick slurry is designed, and high-efficiency combustion of harmful substances in the hearth is achieved through effective regulation and control of the screw pump.

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 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 utility model provides a pulverized coal pyrolysis, circulating fluidized bed boiler and gasification furnace integrated device which comprises a pyrolysis unit, a heat carrier heating unit, a powder selecting unit, a circulating fluidized bed boiler unit and a gasification unit, a solid phase outlet of the pyrolysis unit is independently connected with the heat carrier heating unit and the powder selecting unit, and a solid phase outlet of the gasification unit is independently connected with the circulating fluidized bed boiler unit. A smoke outlet pipeline of the heat carrier heating unit is connected with the powder selecting unit and the circulating fluidized bed boiler unit, an upper outlet of the powder selecting unit is connected with the gasification unit, and a lower outlet of the powder selecting unit is connected with the circulating fluidized bed boiler unit. According to the utility model, the particle size of the coke breeze after pulverized coal pyrolysis is graded, the graded coke breeze with smaller particle size is used for gasification, and the coke breeze with larger particle size is used as the fuel of the circulating fluidized bed boiler, so as to meet the requirements of different devices on the particle size of the coke breeze, effectively improve the utilization rate of the coke breeze, maximally utilize sensible heat of the coke breeze and realize efficient recycling of energy; and the treatment cost of downstream coke breeze processing is reduced, and efficient graded and quality-divided utilization of coke breeze is truly realized.