CN110260302B - Combustion system for fluidized bed gasification fly ash - Google Patents

Combustion system for fluidized bed gasification fly ash Download PDF

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Publication number
CN110260302B
CN110260302B CN201910563521.0A CN201910563521A CN110260302B CN 110260302 B CN110260302 B CN 110260302B CN 201910563521 A CN201910563521 A CN 201910563521A CN 110260302 B CN110260302 B CN 110260302B
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hearth
air
fuel
outlet
distribution plate
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CN110260302A (en
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车得福
贾晓威
王长安
王超伟
张锦萍
赵林
杜勇博
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Xian Jiaotong University
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Xian Jiaotong University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
    • F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
    • F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
    • F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/18—Details; Accessories
    • F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/18—Details; Accessories
    • F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F23L7/007—Supplying oxygen or oxygen-enriched air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The invention discloses a combustion system of fluidized bed gasification fly ash, wherein a first fuel bin is arranged at the upper part of a hearth and is conveyed to the junction position of a dense-phase region and a dilute-phase region of the hearth through a gradually expanding pipeline; the inlet of the cyclone separator is connected with the outlet of the hearth, the outlet of the cyclone separator is connected with the inlet of the ash bucket, the outlet of the gasification fly ash bin is connected with the ash bucket, the blower is connected with the ash bucket, and the outlet of the ash bucket is connected to the dense-phase area at the bottom side of the hearth; the limestone bin is connected to the middle part of the hearth, the second fuel bin is connected to a dense-phase area at the bottom side of the hearth, the bottom side air distribution plate is arranged on a lateral inclined plane at the bottom of the hearth, and the bottom air distribution plate is arranged at the bottom of the hearth; the air film separator is arranged at the lower side outside the hearth, the inlet is connected with the outlet of the air compressor, and the outlet is respectively connected with the over-fire air pipeline, the bottom air distribution plate and the bottom air distribution plate. The invention can realize the high-efficiency combustion of the gasified fly ash in the circulating fluidized bed boiler, effectively utilize the gasified fly ash and simultaneously reduce the fuel consumption and NO of the circulating fluidized bed boilerxAnd (4) discharging the amount.

Description

Combustion system for fluidized bed gasification fly ash
Technical Field
The invention belongs to the field of energy conservation and emission reduction in thermal power generation, and particularly relates to a combustion system of fluidized bed gasification fly ash, which is used for recycling waste gas ash generated in the coal gasification process.
Background
The coal gasification process is a clean and efficient coal utilization technology, occupies a large market in the aspect of coal utilization at present, is limited by a process principle, generates a large amount of unburned gasification fly ash in the coal gasification process, and has great significance for the development of the coal gasification process for solving the problem that the gasification fly ash is difficult to utilize.
Compared with raw coal, the gasified fly ash has the advantages of finer particle size, higher ash content and ignition temperature, and the gasification fly ash is difficult to burn out because the combustion temperature cannot be met although the ash content is not greatly influenced when a common circulating fluidized bed boiler burns.
Disclosure of Invention
The invention aims to provide a combustion system of fluidized bed gasification fly ash, which preheats, gathers, burns at local high temperature and burns at an burnout area efficiently to the gasification fly ash by changing the arrangement mode of an air distribution plate, an air inlet mode, a feeding mode and other measures of a circulating fluidized bed boiler, thereby achieving the effects of burning the gasification fly ash efficiently in the fluidized bed boiler and saving energy and reducing emission of the fluidized bed boiler.
The invention is realized by adopting the following technical scheme:
a combustion system of fluidized bed gasification fly ash comprises a first fuel bin, a hearth, a cyclone separator, a gasification fly ash bin, a limestone bin, a second fuel bin, an ash bucket, a blower, a bottom air distribution plate, an air compressor and an air film separator; the first fuel bin is arranged at the upper part of the hearth and is conveyed to the junction position of a dense-phase region and a dilute-phase region of the hearth through a divergent pipeline, and the secondary air inlet is arranged on the side surface of the middle part of the hearth and is communicated with the position where the diameter of the divergent pipeline begins to increase; the inlet of the cyclone separator is connected with the outlet of the hearth, the outlet of the cyclone separator is connected with the inlet of the ash bucket, the outlet of the gasification fly ash bin is connected with the ash bucket, the blower is connected with the ash bucket, the outlet of the ash bucket is connected to the dense-phase area at the bottom side of the hearth, and the top of the cyclone separator is provided with a flue gas outlet;
the limestone bin is connected to the middle part of the hearth, the second fuel bin is connected to a dense-phase area at the bottom side of the hearth, the bottom side air distribution plate is arranged on a lateral inclined plane at the bottom of the hearth, and the bottom air distribution plate is arranged at the bottom of the hearth; the air film separator is arranged on the lower side outside the hearth, an inlet is connected with an outlet of the air compressor, an outlet is respectively connected with the over fire air pipeline, the bottom air distribution plate and the bottom air distribution plate, an inlet of the air compressor is a primary air inlet, a joint of the outlet of the over fire air pipeline and the upper part of the hearth is an over fire air inlet, and an ash residue outlet is further arranged at the bottom of the hearth.
The invention has the further improvement that flow valves are arranged on pipelines respectively connected with the overfire air pipeline, the bottom air distribution plate and the bottom air distribution plate at the outlet of the air film separator.
The invention has the further improvement that the bottom air distribution plate adopts a four-corner tangential air distribution plate, four air inlets are uniformly arranged in the circumferential direction of the bottom air distribution plate, air flow with lower oxygen concentration is blown into the hearth in a direction vertical to the longitudinal axis of the hearth, fuel in a dense-phase region of the hearth rotates around the longitudinal axis of the boiler by blowing air in a manner of four-side tangential circles, fine particle fuel is gathered in the center of the hearth, and meanwhile large particle fuel rotates around an outer ring to prolong the detention time of the large particle fuel in the boiler.
The system is further improved in that three ways of powder feeding are provided, wherein the first way of powder feeding is that gasified fly ash directly enters an ash bucket of a cyclone separator of the circulating fluidized bed boiler through a fuel bin and directly enters a dense-phase area of the circulating fluidized bed boiler through a blower acting on the ash bucket, the second way of powder feeding is connected to the periphery of the dense-phase area of a hearth through a second fuel bin, and the third way of powder feeding is connected to the center of the hearth through the first fuel bin.
The invention is further improved in that low-oxygen-concentration air flow and high-oxygen-concentration air flow are formed through an air film separator, wherein the low-oxygen-concentration air flow is blown into a hearth from a bottom air distribution plate arranged at the bottom side of a boiler, so that fuel in a dense-phase area of the boiler rotates around the longitudinal axis of the boiler, and the high-oxygen-concentration air flow is separately introduced into the central part of the air distribution plate at the bottom of the boiler and an over-fire air channel at the upper part of the boiler, so that high-temperature combustion of fine-particle fuel gathered in the middle of the dense-phase area is promoted.
The invention is further improved in that the powder feeding to the periphery of the dense phase zone of the hearth is the same as or different from the powder feeding to the center of the hearth, the powder feeding amount to the center of the hearth is less than the powder feeding amount to the periphery of the dense phase zone of the hearth, and when the fuels are different, the powder feeding to the center of the hearth adopts the fuel with low nitrogen content.
The invention has the following beneficial technical effects:
the invention provides a fluidized bed gasThe system for burning the gasified fly ash adopts the mode of preheating the gasified fly ash to supply the gasified fly ash at an ash bucket of a cyclone separator of a circulating fluidized bed boiler, mixes the gasified fly ash with high-temperature circulating ash by an air blower to preheat and conveys the mixture to a dense-phase region of a hearth. The bottom side of the hearth is provided with an air distribution plate at the bottom side, air flow with slightly low oxygen concentration is introduced, the tangential speed of the particles in the furnace perpendicular to the longitudinal axis of the hearth is given, the fuel in a dense phase region in the boiler rotates around the longitudinal axis of the boiler while being in suspension combustion, the large-particle fuel rotates around the periphery of the hearth under the action of centrifugal force, the small-particle fuel containing gasified fly ash is gathered in a central axis region of the hearth, the retention time of the large-particle fuel in the boiler is prolonged, and the NO of the fuel at the periphery of the hearth isxThe release amount is also beneficial to slag discharging of the ash on the bottom side of the hearth; the method for carrying out local high-temperature combustion on the gasified fly ash is to improve the oxygen content of primary air at the central part of an air distribution plate at the bottom of a boiler, fine-particle fuel is combusted at high temperature by introducing primary air with high oxygen concentration into the center of a hearth, the gasified fly ash can be effectively combusted at high temperature, meanwhile, a powder supply pipeline is arranged at the center of the hearth from top to bottom, tangential air is introduced into the part where the diameter of the pipeline begins to be enlarged to enable the fuel to rotate downwards to form convection with the small-particle fuel containing the gasified fly ash and then diffuse to the cross section of the hearth, so that disturbance in the boiler is enhanced, the combustion effect is enhanced, and finally, the fuel in the boiler is further combusted by high-oxygen concentration.
Furthermore, the mode of gathering the gasified fly ash is that four corner tangential air distribution plates are arranged at the bottom side of the hearth, and a tangential speed is given to fuel particles in a dense-phase region of the hearth, so that the fuel particles rotate around the longitudinal axis of the hearth, due to the action of centrifugal force, large-particle fuel rotates around the periphery of the hearth, the residence time of the large-particle fuel in a boiler is prolonged, small-particle fuel is gathered in the central axis region of the hearth, and the gasified fly ash is gathered in the central axis region of the hearth due to the fine particle size.
Further, the air membrane separator can divide the air entering the instrument into two air flows with higher oxygen concentration and lower oxygen concentration, wherein the air flow with higher oxygen concentration is introduced into the central part of the air distribution plate at the bottom of the hearth and the over-fire air pipeline at the upper part of the hearth, and the air flow with lower oxygen concentration is introduced into the air distribution plate at the bottom side of the hearth, so that the NOx generated by burning large-particle fuel gathered at the periphery of the hearth in a reducing atmosphere is lower, the combustion temperature is ensured by burning small-particle fuel gathered at the middle shaft area of the hearth under high oxygen concentration, and the mixed fuel can be further burnt under the action of over-fire air with high oxygen concentration. In addition, the air film separator can ensure that the total intake oxygen content in the hearth is not changed.
Furthermore, the flow valve can adjust the air inflow, ensure the fluidization state of the fuel in the boiler and the rotation state of fuel particles in a dense-phase region, and simultaneously control the air volume of the burnt-out air to ensure the combustion effect of the mixed fuel.
Furthermore, the fuels of the first fuel bin and the second fuel bin can be the same or different, and because the reducing atmosphere at the periphery of the dense-phase region of the hearth can inhibit the generation of nitrogen oxides sent by the second fuel bin to the fuels, the powder feeding amount of the first fuel bin sent to the center of the hearth is smaller, and when the fuels are different, the fuels with low nitrogen content are preferentially adopted, and the NOx of the whole fuel of the circulating fluidized bed boiler is lower than that of a common fluidized bed boiler.
In summary, the present invention can increase the local combustion temperature of the boiler for the gasified fly ash by changing the arrangement of the air distribution plates, the oxygen content of the primary air, the oxygen content of the overfire air and the feeding mode of the circulating fluidized bed boiler, so that the gasified fly ash can be efficiently combusted in the circulating fluidized bed boiler, thereby not only solving the utilization problem of the gasified fly ash, but also reducing the fuel consumption and the discharge amount of nitrogen oxides of the circulating fluidized bed boiler.
Drawings
FIG. 1 is a schematic view of a fluidized bed gasification fly ash combustion system according to the present invention;
fig. 2 is a schematic view of a bottom side grid of a circulating fluidized bed boiler.
Description of reference numerals:
1-a first bunker; 2-hearth; 3-a cyclone separator; 4-gasification fly ash bin; 5-limestone silo; 6-a second fuel silo; 7-ash bucket; 8-a blower; 9-bottom air distribution plate; 10-bottom side wind distribution plate; 11-a flow valve; 12-an air compressor; 13-an air membrane separator; 101-an air inlet;
a-a primary air inlet; b, a secondary air inlet; c-an overfire air inlet; d-a flue gas outlet; e-ash outlet.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the system for burning fluidized bed gasification fly ash provided by the present invention comprises a first bunker 1, a furnace 2, a cyclone separator 3, a gasification fly ash bunker 4, a limestone bunker 5, a second bunker 6, an ash bucket 7, a blower 8, a bottom air distribution plate 9, a bottom air distribution plate 10, a flow valve 11, an air compressor 12 and an air film separator 13.
The first fuel bin 1 is arranged at the upper part of a hearth 2 and is conveyed to the junction position of a dense-phase region and a dilute-phase region of the hearth through a divergent pipeline, and a secondary air inlet B is arranged on the side surface of the middle part of the hearth and is communicated with the position where the diameter of the divergent pipeline begins to increase; an inlet of the cyclone separator 3 is connected with an outlet of the hearth 2, an outlet of the cyclone separator 3 is connected with an inlet of an ash bucket 7, an outlet of the gasified fly ash bin 4 is connected with the ash bucket 7, a blower 8 is connected with the ash bucket 7, an outlet of the ash bucket 7 is connected to a dense-phase area at the bottom side of the hearth, and a flue gas outlet D is formed in the top of the cyclone separator 3; the limestone bin 5 is connected to the middle part of the hearth, the second fuel bin 6 is connected to a dense-phase area at the bottom side of the hearth, the bottom side air distribution plate 10 is arranged on a lateral inclined plane at the bottom of the hearth, and the bottom air distribution plate 9 is arranged at the bottom of the hearth; the air membrane separator 13 is arranged at the lower side outside the hearth, an inlet is connected with an outlet of the air compressor 12, an outlet is respectively connected with an over-fire air pipeline, a bottom air distribution plate 9 and a bottom air distribution plate 10, the inlet of the air compressor 12 is a primary air inlet A, the joint of the outlet of the over-fire air pipeline and the upper part of the hearth 2 is an over-fire air inlet C, and an ash residue outlet E is further arranged at the bottom of the hearth 2. In addition, the bottom grid plate 9 is a four-corner tangential grid plate, and four air inlets 101 are uniformly formed in the circumferential direction of the grid plate.
Referring to fig. 1, it can be seen that the implementation process of the combustion system for fluidized bed gasification fly ash is as follows:
connecting the gasification fly ash bin 4 with an ash bucket 7 of a boiler cyclone separator 3, and blowing air to a dense-phase region of a hearth through an air blower (8) arranged on the ash bucket 7; four symmetrical air distribution plates are arranged at the bottom side of the boiler, and cooperate with a bottom air distribution plate 9 to ensure that fuel particles in a dense-phase region of a hearth rotate around the longitudinal axis of the hearth while keeping a fluidized state, so that large particles are separated from the periphery of the hearth and small particles are separated from a central axis region of the hearth; arranging a gradually expanding powder feeding pipeline from top to bottom in the middle of the hearth, and introducing tangential air at the position where the diameter of the pipeline begins to increase to enable the fuel to rotate downwards in the pipeline; an air film separator 13 is arranged outside the boiler to divide primary air into two air flows with different oxygen concentration, the air flow with high oxygen concentration is introduced into a burnout air pipeline which is introduced into the central part of an air distribution plate 9 at the bottom of the hearth and the upper part of the hearth, and the air flow with lower oxygen concentration is introduced into an air distribution plate 10 at the bottom of the hearth.
The operation process of the combustion system of the fluidized bed gasification fly ash provided by the invention is as follows:
gasified fly ash is mixed with circulating ash in an ash bucket 7 of a cyclone separator 3, the mixture enters a dense-phase region of a hearth through an air blower 8 and is mixed with fuel in the hearth, the mixed fuel spirally rises around the hearth under the action of air inlet of an air distribution plate 10 at the bottom side of the hearth and an air distribution plate 9 at the bottom, large-particle fuel is separated under the action of centrifugal force and is combusted at the periphery of the hearth, small-particle fuel containing the gasified fly ash is gathered and combusted in a central region of the hearth, the mixed fuel is efficiently combusted through adjustment of the air inlet oxygen concentration change of the air distribution plate 9 at the bottom center and an over-fire air pipeline, powder is fed downwards through the center of the hearth so that ascending fuel and descending fuel are convected, disturbance is enhanced, the combustion effect is enhanced, finally circulating ash in tail flue gas separated through the cyclone separator 3 enters the hearth to circulate, and the flue gas enters.
The core idea of the embodiment of the invention is that aiming at the characteristics of fine particle size and difficult combustion of gasified fly ash, reasonable measures are adopted to ensure that the gasified fly ash can be efficiently combusted in a circulating fluidized bed boiler, and the specific measures comprise: preheating the gasified fly ash by introducing the gasified fly ash into an ash bucket 7 of the cyclone separator 3; the fuel particles in the dense-phase area of the hearth are rotated by the action of an air distribution plate 9 at the bottom of the boiler and an air distribution plate 10 at the bottom side, and fine particle fuel containing gasified fly ash is gathered in the center of the hearth; the oxygen content of the air inlet at the central part of the air distribution plate 9 at the bottom of the hearth is improved, so that the gasified fly ash is violently combusted at high temperature; through the reverse convection of the downward rotating fuel flow in the central powder feeding pipeline of the hearth, the disturbance of the mixed fuel is enhanced, the combustion effect is enhanced, and the mixed fuel is further combusted by introducing over-fire air with high oxygen content.
The embodiment can control the rotation and fluidization speed of fuel particles in the hearth, the combustion temperature of fine particles in the middle shaft area of the hearth and the burnout degree of mixed fuel on the upper part of the hearth by adjusting the air film separator 13 and the flow regulating valve 11, so that the gasified fly ash can be efficiently combusted in the circulating fluidized bed boiler.
The embodiment can burn the fuel with high nitrogen oxide emission including the semicoke in the second fuel bin 6, and the nitrogen oxide emission of the fuel can be reduced under the reducing atmosphere because the fuel is introduced into the peripheral region of the dense-phase zone of the hearth with low oxygen concentration.
In the embodiment, the air compressor 12 is added before the air membrane separator 13 to ensure the working efficiency of the air membrane separator 13.

Claims (6)

1. A combustion system for fluidized bed gasification fly ash comprises a hearth (2), a cyclone separator (3), an ash bucket (7), an air blower (8) and a bottom air distribution plate (9), wherein an inlet of the cyclone separator (3) is connected with an outlet of the hearth (2), an outlet of the cyclone separator (3) is connected with an inlet of the ash bucket (7), the air blower (8) is connected with the ash bucket (7), an outlet of the ash bucket (7) is connected to a dense-phase area at the bottom side of the hearth, a flue gas outlet (D) is formed in the top of the cyclone separator (3), the bottom air distribution plate (9) is arranged at the bottom of the hearth, and an ash residue outlet (E) is formed in the bottom of the hearth (2); the gasification device is characterized by also comprising a first fuel bin (1), a gasification fly ash bin (4), a limestone bin (5), a second fuel bin (6), a bottom side air distribution plate (10), an air compressor (12) and an air film separator (13); wherein the content of the first and second substances,
the first fuel bin (1) is arranged at the upper part of the hearth (2) and is conveyed to the junction position of a dense-phase region and a dilute-phase region of the hearth through a divergent pipeline, the secondary air inlet (B) is arranged on the side surface of the middle part of the hearth and is communicated with the position where the diameter of the divergent pipeline begins to increase, and the outlet of the gasification fly ash bin (4) is connected with an ash bucket (7);
the limestone bin (5) is connected to the middle part of the hearth, the second fuel bin (6) is connected to a dense-phase area at the bottom side of the hearth, and the bottom side air distribution plate (10) is arranged on an inclined surface at the bottom side of the hearth; the air membrane separator (13) is arranged on the lower side outside the hearth, an inlet is connected with an outlet of the air compressor (12), an outlet is respectively connected with the over-fire air pipeline, the bottom air distribution plate (9) and the bottom air distribution plate (10), an inlet of the air compressor (12) is a primary air inlet (A), and a joint of the outlet of the over-fire air pipeline and the upper part of the hearth (2) is an over-fire air inlet (C).
2. The system for burning fluidized bed gasification fly ash according to claim 1, wherein the outlet of the air film separator (13) is provided with a flow valve (11) respectively connected with the over-fire air pipeline, the bottom air distribution plate (9) and the bottom air distribution plate (10).
3. The combustion system of fluidized bed gasification fly ash according to claim 1, wherein the bottom grid plate (9) is a tangential grid plate with four corners and four air inlets (101) uniformly arranged along the circumference, and air flow with low oxygen concentration is blown into the furnace chamber perpendicular to the longitudinal axis of the furnace chamber, and the fuel in the dense phase region of the furnace chamber is rotated around the longitudinal axis of the boiler by blowing air in tangential circles at four sides, so as to collect fine-particle fuel in the center of the furnace chamber, and simultaneously rotate large-particle fuel around the outer ring to prolong the residence time of the large-particle fuel in the boiler.
4. The combustion system of fluidized bed gasification fly ash according to claim 1, wherein the system is provided with three powder feeding paths, the first powder feeding path is that the gasification fly ash directly enters an ash hopper (7) of the cyclone separator (3) of the circulating fluidized bed boiler through a fuel bunker, and directly enters the dense phase region of the circulating fluidized bed boiler through a blower (8) acting on the ash hopper (7), the second powder feeding path is connected to the periphery of the dense phase region of the furnace through a second fuel bunker (6), and the third powder feeding path is connected to the center of the furnace through a first fuel bunker (1).
5. The combustion system of fluidized bed gasification fly ash according to claim 1, wherein the low oxygen concentration gas flow and the high oxygen concentration gas flow are formed by an air film separator (13), wherein the low oxygen concentration gas flow is blown into the furnace (2) from the bottom side air distribution plate (10) arranged at the bottom side of the boiler, so that the fuel in the dense phase area of the boiler rotates around the longitudinal axis of the boiler, and the high oxygen concentration gas flow is separately introduced into the central part of the bottom air distribution plate (9) of the boiler and the over-fire air channel at the upper part of the boiler, so as to respectively promote the high temperature combustion of the fine particle fuel gathered in the middle of the dense phase area and ensure the further combustion of the fuel at the upper.
6. The system of claim 1, wherein the pulverized coal fed to the periphery of the dense phase zone of the furnace is the same or different from the pulverized coal fed to the center of the furnace, the pulverized coal fed to the center of the furnace is smaller than the pulverized coal fed to the periphery of the dense phase zone of the furnace, and when the fuels are different, the pulverized coal fed to the center of the furnace is the fuel with low nitrogen content.
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RU200504U1 (en) * 2020-04-01 2020-10-27 Общество с ограниченной ответственностью "БАРНАУЛЬСКИЙ ЭНЕРГОМАШИНОСТРОИТЕЛЬНЫЙ ЗАВОД" Device for returning ash and unburned particles to the boiler furnace
CN112251260B (en) * 2020-11-05 2022-07-12 北京衡燃科技有限公司 Overhead feeding TFB gasification furnace
CN114713358B (en) * 2022-02-24 2022-09-20 淄博金通电力科技有限公司 Separator for removing over-hard particles in coarse-grained pulverized coal

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3354734B2 (en) * 1995-01-13 2002-12-09 三菱重工業株式会社 Method and apparatus for circulating fluidized bed combustion
CN101187471A (en) * 2007-06-27 2008-05-28 巩义市泰华机械厂 Taper tube and ash returning pump and ash recombustion type circulated fluid bed combustion equipment
EP2239500A2 (en) * 2009-03-20 2010-10-13 MVV Biopower GmbH Method for operating a biomass heating power plant with a fluidised bed
CN105444160A (en) * 2014-08-29 2016-03-30 中国科学院工程热物理研究所 Circulating fluidized bed fine ash burning apparatus
CN205939115U (en) * 2016-08-30 2017-02-08 福建省联盛纸业有限责任公司 High -efficient circulating fluidized bed boiler of papermaking
CN107859993A (en) * 2017-11-08 2018-03-30 上海锅炉厂有限公司 A kind of CFB Slag cooling structure and method
CN207455572U (en) * 2017-11-21 2018-06-05 东莞顺裕纸业有限公司 Cinder reinjection revert system
CN108504395A (en) * 2018-04-25 2018-09-07 新奥科技发展有限公司 A kind of coal gasification apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7287477B2 (en) * 2004-10-13 2007-10-30 Foster Wheeler Energy Corporation Cyclone bypass for a circulating fluidized bed reactor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3354734B2 (en) * 1995-01-13 2002-12-09 三菱重工業株式会社 Method and apparatus for circulating fluidized bed combustion
CN101187471A (en) * 2007-06-27 2008-05-28 巩义市泰华机械厂 Taper tube and ash returning pump and ash recombustion type circulated fluid bed combustion equipment
EP2239500A2 (en) * 2009-03-20 2010-10-13 MVV Biopower GmbH Method for operating a biomass heating power plant with a fluidised bed
CN105444160A (en) * 2014-08-29 2016-03-30 中国科学院工程热物理研究所 Circulating fluidized bed fine ash burning apparatus
CN205939115U (en) * 2016-08-30 2017-02-08 福建省联盛纸业有限责任公司 High -efficient circulating fluidized bed boiler of papermaking
CN107859993A (en) * 2017-11-08 2018-03-30 上海锅炉厂有限公司 A kind of CFB Slag cooling structure and method
CN207455572U (en) * 2017-11-21 2018-06-05 东莞顺裕纸业有限公司 Cinder reinjection revert system
CN108504395A (en) * 2018-04-25 2018-09-07 新奥科技发展有限公司 A kind of coal gasification apparatus

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