698 results about "Circulating fluidized bed boiler" patented technology

The invention discloses a circulating fluidized bed boiler bed temperature optimization control method and system, and the method comprises the steps: obtaining and preprocessing the historical operation data of a circulating fluidized bed boiler, analyzing the preprocessed data, and determining the operation characteristic parameters affecting the bed temperature of the circulating fluidized bed boiler; building a bed temperature prediction model based on the operation characteristic parameters and a preset neural network model, and performing prediction according to the bed temperature prediction model to obtain bed temperature prediction data; acquiring a bed temperature requirement for the circulating fluidized bed boiler, and determining a deviation characteristic between the bed temperature prediction data and the bed temperature requirement; analyzing and evaluating the bed temperature difference of the circulating fluidized bed boiler based on the deviation characteristics to obtain a bed temperature difference evaluation value; and determining an operation optimization coefficient according to the bed temperature difference evaluation value, and performing optimization control on the bed temperature of the circulating fluidized bed boiler according to the operation optimization coefficient. The running efficiency and stability of the circulating fluidized bed boiler can be improved, energy consumption and emission are reduced, and therefore the benefits of energy conservation, emission reduction and cost reduction are achieved.

The invention discloses a predictive optimization control method and system for joint debugging of bed temperature and bed pressure of a circulating fluidized bed boiler, and relates to the field of industrial automatic control, and the method comprises the steps: screening out key operation parameters affecting the bed temperature and the bed pressure from a historical data set according to the operation condition and the actual operation demand of the boiler, determining a modeling feature set influencing the bed temperature and the bed pressure; based on the boiler bed temperature and bed pressure prediction model, obtaining a boiler bed temperature and bed pressure prediction value under each load; determining an optimization target and constraint conditions to obtain a boiler bed temperature and a bed pressure target value under each load; according to the boiler bed temperature and bed pressure prediction values and the corresponding target values under each load, the error and the error change rate of each prediction value and the corresponding target value are determined; therefore, the parameter adjustment amount of the PID controller can be determined. And further determining the control quantity output of the rotating speed of the slag cooler or the frequency of the primary fan. According to the invention, the response capability of the system to emergencies can be improved, and the flexibility and accuracy of regulation and control are enhanced.

The invention discloses an efficient denitration device of a circulating fluidized bed boiler, and relates to the technical field of denitration, the efficient denitration device comprises a treatment tower, the surface of the treatment tower is fixedly provided with a smoke inlet, the surface of the treatment tower is fixedly provided with a smoke outlet, the bottom of the treatment tower is fixedly provided with a discharge pipe, and the top of the treatment tower is fixedly provided with a purification device; a liquid outlet pipe is arranged at the bottom of the purification device; the scraping device is arranged in the treatment tower, the scraping device comprises a motor, a reciprocating screw rod, a fixed rod, a threaded block, a circular concave plate, an elastic telescopic rod, a scraping plate, an L-shaped rod and a trapezoidal block, the motor rotates to drive the reciprocating screw rod to rotate, the reciprocating screw rod rotates to drive the elastic telescopic rod to rotate, the motor is fixedly mounted at the top of the treatment tower, and the fixed rod is fixedly mounted at the bottom of the treatment tower. And smoke dust in the flue gas is prevented from adhering to the interior of the treatment tower due to long-time introduction of the flue gas, and a smoke inlet is blocked due to long-time accumulation, so that the denitration efficiency is not influenced.

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 relates to the technical field of sludge treatment, in particular to a low-calorific-value incineration sludge circulating fluidized bed boiler system which comprises a sludge component monitoring module, a fuel proportion adjusting module, a drying and gasifying module, a staged combustion module, a heat energy recycling and power generating module, an ash sorting module and a flue gas purifying module. Wherein the sludge component monitoring module is used for collecting organic matter content, water content and calorific value data of sludge; the fuel ratio adjusting module is used for automatically adjusting the ratio of the sludge to the auxiliary fuel; and the drying and gasifying module is used for receiving the fuel mixture and drying the fuel mixture by utilizing waste heat of the incinerator, and meanwhile, part of organic matters are converted into combustible gas through gasifying treatment. According to the invention, through intelligent fuel adjustment, waste heat recovery and multi-stage flue gas purification technologies, high-efficiency combustion, energy reutilization and up-to-standard emission of the low-calorific-value sludge are realized, and the environmental protection property and economical efficiency of sludge treatment are remarkably improved.

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 utility model discloses a feed pump core cladding protection system which comprises a circulating fluidized bed boiler, an outlet of the circulating fluidized bed boiler is communicated with an inlet of a steam turbine, an outlet of the steam turbine is communicated with an inlet of a condensate pump, and an outlet of the condensate pump is respectively communicated with an inlet of a slag cooler and an inlet of a booster pump. An outlet of the slag cooler is communicated with an inlet of the water feeding pump through a low-pressure heater and a deaerator in sequence; the booster pump outlet is communicated with the feed pump inlet; the outlet of the high-pressure heater is communicated with the inlet of the circulating fluidized bed boiler. According to the system, a bypass is additionally arranged beside a pipeline, leading to sealing water of a feed pump, of a condensate pump, a booster pump is additionally arranged on the bypass, and the pressure of condensate entering the feed pump seal is adjusted. The lowest pressure of the outlet of the condensate pump is set, once the pressure is smaller than the minimum pressure required by a sealing system, the booster pump is started immediately, stable condensate pressure is guaranteed, a water pump core bag is prevented from being damaged, and safe operation of a unit is guaranteed.

The invention relates to the technical field of solid waste resource utilization, in particular to a flue gas desulfurization circulating fluidized bed boiler ash in-furnace modifier and a preparation method and application thereof.The modifier is prepared from, by mass, 90% of steel slag, 1%-3% of rare earth tailings and 7%-9% of electric furnace phosphorus slag; the modifier prepared by the invention can realize in-furnace modification of flue gas desulfurization circulating fluidized bed boiler ash, the obtained modified ash is low in water demand, the SO3 content is less than 3.0%, and the strength activity index is increased to 90% or above; the modifier also has combustion-supporting, desulfurization and denitrification functions, and can reduce the combustion temperature, improve the desulfurization and denitrification effect and reduce the load of a flue gas desulfurization system; the raw materials are all bulk solid wastes and do not contain carbonate, the modifier is not decomposed in the using process, CO2 is not discharged, and the modifier is green, low-carbon and environment-friendly, is beneficial to promoting ultra-low emission of a circulating fluidized bed boiler coal-fired power generation technology and is remarkable in economic effect.

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 utility model discloses a circulating fluidized bed boiler furnace outlet horizontal flue ash removal device which comprises a furnace, a horizontal flue, a cyclone separator, a high-temperature superheater, a low-temperature superheater, a coal economizer and an ash removal device, one end of the ash removal device is arranged at the bottom of the horizontal flue, and the other end of the ash removal device is arranged at the lower end of the coal economizer. The ash removal device comprises a primary air pre-heater, a conveying air pipe, a conveying air branch pipe and an ash removal module, and the ash removal module is arranged at the bottom in the horizontal flue and comprises a main air pipe, a branch air pipe, a connecting rod and a small air cap. A small part of primary air is led to the bottom of the horizontal flue at the hearth outlet through the bypass pipeline of the primary air pre-heater and enters the ash removal device, accumulated ash accumulated at the horizontal flue at the hearth outlet is loosened and fluidized through the small air cap and then enters the cyclone separator along with flue gas, and therefore the purpose of removing the accumulated ash in the horizontal flue at the hearth outlet is achieved. After accumulated ash is cleaned, the smoke flow speed of a hearth outlet is reduced, and the efficiency of the boiler is 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 discloses a coal-fired circulating fluidized bed boiler graded ammonia doping system and method capable of adjusting the ammonia doping proportion. Comprising a first-stage ammonia gas channel, a second-stage ammonia gas channel, a third-stage ammonia gas channel, a fourth-stage ammonia gas channel, a furnace bottom primary air distribution plate, a primary fan, a primary air box, a lower secondary air cylinder, a coal spreading pipe, an upper secondary air cylinder, a cyclone separator inlet ammonia gas measuring point, a NOx measuring point and a NOx measuring point in a tail flue. The first-stage ammonia gas channel is arranged at the position of the primary air box in a penetrating mode, the second-stage ammonia gas channel is arranged between the upper secondary air cylinder and the lower secondary air cylinder, the third-stage ammonia gas channel is arranged above the upper secondary air cylinder, and the fourth-stage ammonia gas channel is arranged below the top of the hearth. The four stages of ammonia gas channels are arranged, the provided adjusting method is combined, ammonia doping adjustment of the coal-fired circulating fluidized bed boiler under different loads in different proportions is achieved, the ammonia doping flexibility is improved, and the combustion stability of the circulating fluidized bed boiler under the low load is improved.

The utility model relates to the technical field of fluidized bed boilers, and discloses a tail flue device of a circulating fluidized bed boiler, which comprises a hollow ventilation shell with openings on the upper side and the lower side, the inside of the ventilation shell is connected with a hollow shell body through a fixing plate, the shell body is annular, the inside of the shell body is rotatably connected with a connecting plate, and a space is reserved between the connecting plate and the upper inner wall of the shell body. An air outlet pipe is arranged on the lower side of the connecting plate, air is pumped into the air inlet pipe through the air outlet pipe, the connecting plate and other structures, air enters the air outlet pipe and is blown out from an air outlet nozzle, and therefore dust on the inner wall of the ventilation shell is blown off. Compared with the prior art, the air outlet nozzle can rotate around the axis of the connecting plate while blowing air, so that blown air is in uniform contact with the inner wall of the ventilation shell, and the dust removal effect is ensured.

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 a circulating fluidized bed boiler and an ammonia-doped combustion method, and belongs to the field of fluidized bed boilers. The side surface of the upper part of a hearth in the boiler is communicated with an inlet flue of the cyclone separator; a gas inlet and an air inlet are formed in an inlet flue of the cyclone separator, a thermocouple is arranged in the cyclone separator, and a flue gas analysis device and an ammonia spraying port are arranged at an outlet of the center cylinder; the introduced fuel gas and air are combusted in the cyclone separator, so that the temperature in the cyclone separator is 950-1000 DEG C; ammonia is injected from an ammonia injection port at the tail gas outlet to reduce nitrogen oxides in the tail gas; the thermocouple monitors the temperature in the cyclone separator in real time, and the flue gas analysis device monitors the concentration of nitric oxide in the tail gas in real time; the PID controller controls the flow of fuel gas, air and sprayed ammonia in real time according to the internal temperature of the cyclone separator and the concentration of nitrogen oxide. The combustion efficiency of the boiler is guaranteed, emission of nitric oxide, especially nitrous oxide, during ammonia-doped combustion of the circulating fluidized bed is reduced, and the boiler is simple and easy to transform.

The invention relates to the technical field of circulating fluidized bed boilers, and discloses an oxygen-enriched combustion optimization method for a low-load circulating fluidized bed boiler, and the method comprises the steps: obtaining oxygen-enriched combustion influence data, and dividing the oxygen-enriched combustion influence data into internal oxygen-enriched combustion influence data and associated oxygen-enriched combustion influence data; safe operation data are extracted, internal oxygen-enriched combustion data are processed, and internal oxygen-enriched combustion influence factors are calculated; determining oxygen-enriched combustion optimization demand information, and constructing an associated demand analysis value model; outputting an associated demand analysis value associated with the oxygen-enriched combustion influence data, and calculating an associated oxygen-enriched combustion influence factor; a comprehensive oxygen-enriched combustion influence factor is calculated according to the internal oxygen-enriched combustion influence factor and the associated oxygen-enriched combustion influence factor, and an oxygen-enriched injection strategy is set, so that accurate control of a high-concentration oxygen supply system is realized, and safe and stable operation of a boiler is ensured while efficient and clean combustion is realized; and a solid theoretical basis and technical support are provided for energy conservation, consumption reduction and emission reduction of the low-load CFB boiler.

The utility model belongs to the technical field of circulating fluidized bed boiler center cylinder equipment, and particularly relates to a circulating fluidized bed boiler center cylinder which comprises an arc plate, a circular plate is fixedly connected to the upper end of the surface of the arc plate, a protection plate is movably connected to the surface side of the arc plate, and an anti-expansion ring is fixedly connected to the right end of the surface side of the protection plate. An operator inserts a plurality of groups of arc plates into insertion grooves through insertion rods and installs protection plates and anti-packing rings on the arc plates, the protection plates and the anti-packing rings penetrate through stop blocks through through grooves, meanwhile, a pull plate is swung to extrude a spring to drive a movable block to contract, the protection plates and the anti-packing rings are rotated to enable the stop blocks to be inserted into installation grooves, and the stop blocks are installed in the installation grooves. And when the protection plate and the anti-piston ring need to be taken out, a pulling plate is swung, so that an extrusion spring pops up a movable block, the movable block pops up the protection plate and the anti-piston ring, transportation is facilitated, and when parts are damaged, disassembly is convenient and fast.

The invention relates to the technical field of boiler self-adaptive control, and discloses a circulating fluidized bed boiler load response system based on self-adaptive control, which comprises a data acquisition unit and a control unit, wherein the data acquisition unit is used for acquiring boiler operation state data and load change data; the control unit comprises a first processing module used for generating a predicted output load interval of the current boiler according to the boiler operation state data and the load change data; the second processing module is used for generating a corresponding boiler correction decision; and the third processing module is used for correcting the boiler operation parameters. Through self-adaptive control, a preheating combustion technology, accurate fuel injection control and an intelligent wind powder module, quick response to load change is realized, and the combustion efficiency and the system stability are improved.