1116results about "Fluidized bed combustion" patented technology

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

The invention discloses a digital twinning method and system for staged combustion of a coal-biomass fluidized bed. The method comprises the following steps: establishing a comprehensive database comprising three-dimensional simulation data and operation data of a coal-biomass fluidized bed boiler; modeling and coupling the gas phase and the particle phase by using a neural network to obtain a coal-biomass combustion model which is used for predicting a temperature field, a pressure field and a velocity field of the coal-biomass fluidized bed boiler; and finally, integrating the coal-biomass combustion model with a boiler PLC system of the coal-biomass fluidized bed to realize data transmission, so as to obtain a coal-biomass combustion digital twinborn model and realize real-time control and dynamic optimization. On-line real-time prediction of the boiler is achieved, and long-term updating of the model and continuous improvement of the intelligent level are achieved through continuous accumulation and dynamic training of operation data.

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

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

The utility model discloses a coupled biomass chemical looping combustion system which comprises an air reactor, a cyclone separator, a return feeder and a fuel reactor, the air reactor is communicated with the return feeder through the cyclone separator, the air reactor is configured to complete an oxidation reaction based on the received oxygen carrier and air, the generated oxidation-state oxygen carrier is conveyed to the cyclone separator under the driving of flue gas, and the corresponding oxidation-state oxygen carrier is conveyed to the return feeder through the cyclone separator; the return feeder is respectively communicated with the air reactor and the fuel reactor through a material conveying pipe, the input oxidation-state oxygen carrier is input into the air reactor and / or the fuel reactor by the return feeder, and the fuel reactor completes an oxidation-reduction reaction based on the received oxidation-state oxygen carrier and biomass fuel; the fuel reactor is used for inputting the reduced oxygen carrier into the air reactor through a return pipe; and the exhaust port of the fuel reactor is provided with a carbon dioxide trapping device so as to complete trapping of discharged carbon dioxide.

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 relates to a circulating fluidized bed boiler system with a sorting and feeding unit, comprising: a circulating fluidized bed boiler comprising a hearth, a first separator and a return feeder which are in pairwise communication, the return feeder is communicated with a dense-phase region or a corresponding region of the hearth through a return pipe, and the hearth is provided with a fuel supply inlet and a conventional fluidized air inlet; the sorting and feeding unit is suitable for sorting fuel into first fuel in a first particle size range and second fuel in a second particle size range, the first particle size range is larger than the second particle size range, the first fuel is suitable for being introduced into a fuel supply inlet, and the second fuel is suitable for being introduced into a peak regulation feeding opening of the circulating fluidized bed boiler based on pneumatic conveying. The invention further relates to a control method of the circulating fluidized bed boiler system.

The present invention discloses an ammonia-blended swirl burner with a multi-channel ammonia fuel pipe, which belongs to the technical field of burners. By arranging an ammonia fuel pipe assembly composed of an outer ammonia fuel pipe, an inner ammonia fuel pipe and an end ammonia fuel pipe in a primary air duct, the reliable and safe transportation of ammonia fuel in the swirl burner can be realized; and by setting the outlet of the ammonia fuel to a structure extending a certain distance from the outlet of the primary air duct, in combination with the trumpet-shaped outlet section at the end of the primary air duct and the flow-guiding refractory mechanism, the safe low-nitrogen and efficient combustion of ammonia fuel after being transported in the burner can be realized. The ammonia-blended swirl burner with a multi-channel ammonia fuel pipe in the present invention has a compact structure and is easy to use. It can not only ensure the air tightness of the ammonia channel, but also flexibly adjust the incident position and incident speed of ammonia, effectively realize the efficient and low-nitrogen combined combustion of coal powder and ammonia fuel, improve the environmental protection of coal-fired boilers during use, and reduce the operating cost of coal-fired boilers, and has good practical value.

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

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

A smoke filtering method using smoke drainage includes: a smoke collecting box and a rotating plate, wherein the smoke collecting box is divided into a filter chamber and an adjustment chamber by a partition plate, and a fixed frame is fixedly connected to a fixed groove opened in the filter chamber by a mosaic plate, and a diversion groove is opened at the upper end of the fixed frame, and drainage grooves are symmetrically opened at the bottom of both sides of the diversion groove, and a filter screen is fixedly connected to the middle of the fixed frame, and the rotating plate is movably connected in the adjustment chamber, and the inner cavity of the rotating plate is connected to the inner cavity of the partition plate through a through hole, and the side of the rotating plate away from the partition plate is fixedly connected to the main rotating rod, and the main rotating rod is movably connected to the smoke collecting box through a bearing, and a storage groove is symmetrically opened on the side of the adjustment chamber, and a positioning block is slidably connected in the storage groove by a spring and a fixed rod. The present invention can enhance the filtering effect of the device on dust particles in smoke and reduce the probability of dust particles polluting the environment through the cooperation of the fixed frame, the filter screen, the drainage groove and the diversion groove.

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

The invention discloses a 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.

A burner process for iron fuel combustion, comprising the steps of: providing an iron fuel suspension medium comprising iron fuel and oxygen in a suspension solid density of between 2 to 15 kg / Nm3 and more preferably of between 4 to 8 kg / Nm3; introducing said iron fuel suspension medium into an iron fuel burner arrangement at a velocity of between 5.5 and 55 m / s and more preferably between 20 and 40 m / s; introducing air from air inlet means into said iron fuel burner arrangement, wherein said air from said air inlet means is introduced with an overall angular momentum ratio between said air and said iron fuel suspension medium of between 3 and 12 and more preferably between 3.8 and 8.9; mixing said iron fuel suspension medium by subjecting it with said air such that an overall oxygen-to-fuel equivalence ratio is obtained between 1.0 and 2.5 and more preferably between 1.2 and 1.8 for obtaining a combustible medium in the said burner arrangement; igniting said combustible medium to provide a combusting iron fuel containing medium.

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

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

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

The invention discloses a 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 present invention discloses a structure for regulating the circulation flow rate of a circulating fluidized bed boiler, comprising a cyclone separator, a ventilation pipe, and an air intake and exhaust assembly. The ventilation pipe passes through the side wall of the material leg of the cyclone separator, one end of the ventilation pipe is located at the inner upper end of the material leg and has a vent, and the other end of the ventilation pipe is located outside the material leg; the air intake and exhaust assembly is connected to the other end of the ventilation pipe, and is used to introduce air into the inner upper end of the material leg through the ventilation pipe to increase the pressure at the inner upper end of the material leg, and to exhaust air from the inner upper end of the material leg through the ventilation pipe to reduce the pressure at the inner upper end of the material leg. The present invention can regulate the circulation flow rate of a circulating fluidized bed boiler, and has a fast response speed, is easy to adjust, and is simple to operate.

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.

The invention discloses a circulating fluidized bed boiler bed slag recycling device which comprises a mounting base, a slag elevator and a mounting frame are fixedly arranged at the top of the mounting base, a slag bin slag sliding pipe is fixedly arranged at the discharging end of the slag elevator, and a discharging pipe is fixedly arranged at the bottom of the slag bin slag sliding pipe. A connecting pipe is arranged below the discharging pipe, and a pneumatic opening and closing assembly is arranged between the top of the connecting pipe and the bottom of the discharging pipe. The mounting frame is driven by the vibration assembly to vibrate, so that the mounting frame drives the first-stage screen and the second-stage screen to vibrate, the first-stage screen and the second-stage screen are used for screening slag, the slag removed through screening enters the slag bin, screened fine materials are conveyed into the collecting box on the ground through the recycling pipe, and therefore the slag can be recycled conveniently; the waste of bed materials such as sand, mud powder, pebbles, stones and iron blocks in the furnace slag is avoided, and the problem that the cost is increased due to the purchase of new bed materials is avoided.

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.

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

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

The invention discloses an energy storage type vertical fluidized bed fluidized bed furnace which comprises a combustion chamber, a dust remover and a settling chamber independently arranged between the combustion chamber and the dust remover. An inlet and an outlet are symmetrically formed in the two sides of the settling chamber, a smoke pipeline is arranged at the top of the combustion chamber and communicated with the inlet, the dust remover is provided with a cyclone pipeline, the cyclone pipeline is communicated with the outlet, and the sectional area of the outlet is larger than that of the inlet; a partition plate extending downwards from the inner wall of the top of the settling chamber enables the inner space of the settling chamber to form a U-shaped flow channel, the U-shaped flow channel comprises a first flow channel, a bottom flow channel and a second flow channel, and an inverted-cone-shaped inner cavity is formed below the bottom flow channel. According to the invention, secondary combustion of unburnt particles before entering the dust remover is realized, the combustible content in the flue gas is obviously reduced, the carbon deposition risk of subsequent dust removal equipment is reduced, the temperature of the flue gas entering the dust remover is reduced, and the service life of the equipment is prolonged.