434 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 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 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 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 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 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 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 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.

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 utility model relates to the technical field of admixture preparation devices, in particular to slurry mineral admixture production equipment which comprises an emission collecting and processing unit, a flue gas desulfurization unit and a mineral admixture production unit which are sequentially connected in series, a desulfurizer slurry production unit is connected between the emission collection and treatment unit and the mineral admixture production unit, and the emission collection and treatment unit is in communication connection with the mineral admixture production unit; the desulfurizer slurry production unit is connected with the flue gas desulfurization unit; according to the slurry mineral admixture production equipment, available raw materials and emissions of a circulating fluidized bed power plant can be utilized, fly ash, furnace slag and desulfurization products are used as main raw materials, and a series of problems that emissions of a traditional circulating fluidized bed power plant need to be treated independently and the like are solved; solid waste emission of a power plant is reduced, the utilization rate of emissions of the circulating fluidized bed boiler power plant is increased, and a mineral admixture can be prepared.

The invention relates to the technical field of circulating fluidized beds, and discloses a plasma pulverized coal burner for a circulating fluidized bed, which comprises a circulating fluidized bed boiler, a lower air chamber is arranged on the circulating fluidized bed boiler, an air distribution plate is arranged in the circulating fluidized bed boiler, and a side air pipe is mounted on one side of the lower air chamber; a pulverized coal combustion mechanism is arranged on one side of the circulating fluidized bed boiler; according to the invention, high-temperature plasma arc is utilized to heat pulverized coal, combustion is complete, soot is not generated, hot air enters the lower air chamber, ash is conveyed to the upper space of the air distribution plate of the circulating fluidized bed, and the ash is fully combusted through deep fusion of the plasma pulverized coal burner and the circulating fluidized bed process. Efficient and stable combustion of pulverized coal under the low-temperature condition is achieved, the load adjusting capacity of the boiler is improved, the problem that fuel oil or natural gas needs to be consumed during cold-state starting is solved, and meanwhile the problem of ash heat value loss caused by insufficient combustion of low-quality coal is solved.

The utility model discloses a circulating bed boiler, which belongs to the technical field of circulating bed boilers and comprises a boiler body, and an air distribution plate is arranged in the boiler body. A slag falling pipe penetrates through the air distribution plate; the outer wall of the slag falling pipe is sleeved with a water cooling sleeve; the slag falling pipe extends out of the upper surface of the air distribution plate; a protective layer is arranged on the outer wall of the slag falling pipe on the upper surface of the air distribution plate; the protective layer is formed by castable, and the thickness of the protective layer is 150 mm. The circulating bed boiler can effectively solve the problems that in the prior art, a slag falling pipe in a circulating fluidized bed boiler is continuously scoured by high-concentration bed materials for a long time, so that the slag falling pipe and a water cooling sleeve on the outer wall are abraded or exploded, and the like.

The invention discloses a heat supply and power generation system coupled with molten salt heat storage to improve the flexibility of a thermoelectric load and an operation method. The heat supply and power generation system comprises a multi-source heat source module, a molten salt heat storage and release module, a steam power generation module, a graded heat supply module, a multi-medium heat exchange module and an intelligent regulation and control module. The multi-source heat source module comprises a pulverized coal boiler of a main heat source unit and a solar trough heat collector array and a biomass circulating fluidized bed boiler of an auxiliary heat source unit; the molten salt heat storage and release module comprises a high-temperature heat storage tank, a low-temperature heat storage tank, a molten salt circulating pump, a molten salt make-up pump, a molten salt heater and a molten salt cooler. Through the collaborative design of the multi-source heat source module, the molten salt heat storage and release module, the steam power generation module, the graded heat supply module, the multi-medium heat exchange module and the intelligent regulation and control module, the thermoelectric coupling rigidity is broken through, and the load regulation flexibility is remarkably improved.

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 application discloses a circulating fluidized bed boiler secondary air control method and system based on coal quality characteristics, relates to the technical field of automatic control, solves the technical problem that the existing manual control secondary air strategy makes it difficult to adjust the secondary air and match the secondary air with the furnace environment in time, and further causes the low efficiency of secondary air regulation, and comprises the following steps: acquiring industrial data of a fluidized bed boiler, constructing a digital twin model of the fluidized bed boiler based on the industrial data; acquiring coal quality data and furnace data of the coal to be added; inputting the coal quality data and the furnace data into the digital twin model to obtain corresponding simulated furnace data; generating a secondary air control scheme based on the simulated furnace data; regulating and controlling the fluidized bed boiler based on the secondary air control scheme; acquiring real-time furnace data, generating a secondary air adjustment scheme based on the real-time furnace data; and regulating and controlling the fluidized bed boiler based on the secondary air adjustment scheme; and the overall operation efficiency of the boiler 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.

The invention relates to a sludge incineration treatment system, and belongs to the field of sludge treatment. Comprising a sludge feeding system, an incineration system, an ash delivery system and an ash circulation system. By means of the double-sleeve type ash feeding pipeline, the air feeding quality can be improved, the problem that the rear section of a traditional air feeding system is small in pressure and prone to blockage is solved, high-pressure blowing is matched, and the stability of a sludge feeding system is guaranteed. A wear-resistant protective sleeve is additionally arranged at the elbow of the ash conveying pipeline, so that normal operation of equipment is ensured. The sleeve type high-temperature protection pipe is additionally designed, so that the problem of pipeline breakage caused by thermal expansion is completely eradicated; through the design structure of the valve, the flashboard is prevented from being clamped due to the fact that ash residues are accumulated in the supporting plate or gaps. By designing a cooling water line of the cooler, the steam heat efficiency of the circulating fluidized bed boiler is ensured. And an ash circulating system is additionally arranged, carbon particles which are not completely combusted in ash are fed into the hearth again, and the fuel utilization rate is increased.

The invention discloses a PID (Proportion Integration Differentiation) control method based on secondary air volume, which can realize accurate control of oxygen content in a hearth, and solves the problems that an existing oxygen content PID controller is easy to generate overshoot or oscillation and is difficult to realize accurate and stable control of the oxygen content in the hearth. The method comprises the following steps: firstly, obtaining a weighted average relationship between secondary air volume and boiler steam load through a test time period when the circulating fluidized bed boiler normally operates, and meanwhile, obtaining a weighted average relationship between the secondary air volume and boiler fire coal supply quantity through the test, and taking the ratio of the secondary air volume related to fire coal as 7; the method comprises the following steps: calculating a secondary air volume test predicted value according to the proportional relation that the ratio of the secondary air volume related to the steam load is 3, leading the supply quantity of the secondary air volume by using the secondary air volume test predicted value, and correcting the secondary air volume test predicted value according to the deviation between the traditional hearth oxygen content target value and the oxygen content value in the tail flue gas of the boiler. And the set value of the secondary air volume can be tracked quickly and accurately.

The application discloses a circulating fluidized bed boiler tail gas treatment device and relates to the technical field of circulating fluidized bed boilers, which comprises a cylinder and a tail gas pipe; a filtering round net plate is arranged in the cylinder; a rotating column is rotatably connected to the inside of the tail gas pipe near the filtering cavity; a stepping motor is connected to the outer wall of the tail gas pipe, and the main shaft end of the stepping motor is connected to one end of the rotating column; and a plurality of heating cavities are circumferentially arranged on the rotating column. The heating cavities distributed on the rotating column can be used for batch pushing of tail gas, and the distributed heating cavities pass through the position of the arc plate in sequence. Whenever a heating cavity is docked to the position of the arc plate, the heating cavity heats the tail gas, and when the temperature of the tail gas rises to the required temperature, the temperature sensor drives the rotating column to rotate through the stepping motor, so that the heated tail gas can advance to contact the atomized ammonia water, and the problem that the reaction is insufficient and the tail gas treatment effect is affected due to the fact that the temperature of the tail gas does not reach the set temperature can be avoided.