CN104456545A - Special circulating fluidized bed boiler with flue gas recirculation - Google Patents

Special circulating fluidized bed boiler with flue gas recirculation Download PDF

Info

Publication number
CN104456545A
CN104456545A CN201410813337.4A CN201410813337A CN104456545A CN 104456545 A CN104456545 A CN 104456545A CN 201410813337 A CN201410813337 A CN 201410813337A CN 104456545 A CN104456545 A CN 104456545A
Authority
CN
China
Prior art keywords
flue gas
gas recirculation
flue
communicated
boiler
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410813337.4A
Other languages
Chinese (zh)
Inventor
王欢
王民发
郎凤娥
郑旭娟
郎鹏德
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANXI LANTIAN ENVIRONMANTAL ENGINEERING Co Ltd
Original Assignee
SHANXI LANTIAN ENVIRONMANTAL ENGINEERING Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SHANXI LANTIAN ENVIRONMANTAL ENGINEERING Co Ltd filed Critical SHANXI LANTIAN ENVIRONMANTAL ENGINEERING Co Ltd
Priority to CN201410813337.4A priority Critical patent/CN104456545A/en
Publication of CN104456545A publication Critical patent/CN104456545A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • 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 
    • F23C2201/00—Staged combustion
    • 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 
    • F23C2202/00—Fluegas recirculation

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

The invention discloses a special circulating fluidized bed boiler with flue gas recirculation, which belongs to the technical field of an industrial boiler, relates to a circulating fluidized boiler and solves the problems of the existing circulating fluidized bed boiler that the bed temperature is instable, the heated surface is easily worn, scaling and corrosion exist, NOX emission concentration is high. The special circulating fluidized bed boiler with flue gas recirculation comprises a separator communicated with a hearth, the top of the separator is communicated with three tail vertical flues, the bottom of the separator is communicated with the hearth through a return plate, the tail ends of the vertical flues are sequentially connected with a dust collector and an induced draft fan, and an outlet of the induced draft fan is communicated with the bottom of the hearth through a flue gas recirculation pipe. The balance of overall boiler temperature can be realized by adopting flue gas recirculation technology, the generation of NOX can be inhibited, the fuel adaptability is wide, and the combustion stability is high.

Description

With the specific cycle fluidized-bed combustion boiler of flue gas recirculation
Technical field
The invention belongs to Industrial Boiler Technology field, relate to CFBB, be specifically related to a kind of specific cycle fluidized-bed combustion boiler with flue gas recirculation.
Background technology
CFBB (CFB) is the high-efficiency low-pollution clean-burning technology developed rapidly in recent years, be used widely in fields such as station boiler, Industrial Boiler and offal treatment utilizations, there is the advantages such as efficiency of combustion is high, coal adaptability is strong, load regulation range is wide, high-efficiency low-pollution.But easily following problem is produced in actual moving process:
(1) bed temperature is unstable: boiler is in running, and because of the factor such as physical characteristic, air distribution, gas-solid ratio of fuel, the wild effects such as too high or too low easily appear in bed temperature, and controllability is poor;
(2) heating surface wear is serious: CFBB burn time produce a large amount of ashes and flue gas in contain a large amount of flying dust grains, can clash and wash away heating surface, causing serious wearing and tearing;
(3) NO xconcentration of emission is high: NO in existing CFBB flue gas xcontent is about 400-600mg/m 3, generally adopt the rear denitration technology of SNCR or SCR burning, cost is higher;
(4) slagging scorification corrosion condition is serious: CFBB is when burning high sodium coal, alkali metal at high temperature can evaporate with gaseous state, along with high-temperature flue gas motion, very easily condense on the heating surfaces such as boiler back end ductwork and up-downgoing flue, finally form contamination, dust stratification, slagging scorification and corrosion, and then affect thermal balance in stove, exhaust gas temperature is raised, reduces the thermal efficiency and the reliability of boiler.
In order to solve the above-mentioned defect that existing CFBB exists, the invention provides a kind of specific cycle fluidized-bed combustion boiler with flue gas recirculation.
Summary of the invention
The present invention is that the bed temperature in order to solve the existence of existing CFBB is unstable, heating surface is easy to wear, slagging scorification burn into NO xthe problem that compound concentration of emission is high, and provide a kind of specific cycle fluidized-bed combustion boiler with flue gas recirculation.
The present invention is achieved by the following technical solutions:
A kind of specific cycle fluidized-bed combustion boiler with flue gas recirculation, comprise the separator be communicated with burner hearth, the top of separator is communicated with three vertical flues of afterbody, bottom is communicated with burner hearth by returning charge plate, the end of vertical flue connects deduster and air-introduced machine successively, and the outlet of air-introduced machine is communicated with burner hearth bottom by flue gas recirculation pipe.
Further, water-cooled evaporimeter and superheater is fixed with from top to bottom in first vertical flue in three described vertical flues of afterbody, superheater and economizer is fixed with from down to up in second vertical flue, economizer and air preheater is fixed with from top to bottom in 3rd flue, wherein the bottom of first and second vertical flue is provided with expansion chamber, and the top of second and third vertical flue is reserved with except nitre space.First vertical flue is down pass, is furnished with evaporator section heating surface and the overheated heating surface of part, with descending expansion chamber, be convenient to the sedimentation separation forming ash, can ensure the clean of follow-up flue surface, ash concentration is reduced, thus the flying dust that reduction burning produces is to the wearing and tearing of heating surface; Second vertical flue is uptake flue, arrange superheater and most of economizer, bottom is provided with expansion chamber, SCR denitration installing space is reserved on top, be convenient to realize degree of depth denitration, and the flue-gas temperature in SCR region can be kept to meet the best operating condition of 370 DEG C-420 DEG C, realize best denitration temperature province; 3rd vertical flue is down pass, main layout air preheater heating surface and a part of economizer surface, and SCR denitration installing space is reserved on top, and its outlet realizes docking with the direct of deduster entrance.
Described separator is eccentric scroll casing type efficient flying dust multi-cycle separation device; By deep or light section of formation, the hydrodynamics of high-performance solid material separator and taking into full account of frame for movement optimization of and flue gas swirl strength fast to entrance cigarette, separator self structure, select eccentric scroll casing type efficient flying dust multi-cycle separation device, to realize the bed temperature balanced action of Matter Transfer process further, evaporation capacity heating surface heat transfer in strengthening stove, the ash circulating ratio that final acquisition is larger.
Described burner hearth is poured into a mould by castable refractory, or is overall adiabatic furnace structure; Be different from the regular circulation fluid bed type of furnace, to adapt to the poor fuel combustion of rubbish, unburnable coal or other physicochemical property, to obtain the stove combustion stability of stable underload/ultra-low load and changeable load, there is very high wall with refractory lining, refracto height, realize subregion burning.
The entrance of described separator and material returning device returning charge battered leg have reserved SNCR denitration device spray ammonia position respectively.
What the vertical flue of described afterbody have employed Large Diameter Pipeline, wide pitch and high flow rate arranges structure; The paragraph of the up-downgoing flue vulnerable to pollution part of the vertical flue of afterbody have employed the special setting of Large Diameter Pipeline, wide pitch and high flow rate especially, to ensure high sodium coal, spongiosa fuel, the rubbish to low melting point, and the adaptability of other animals and plants waste material, slow down the black dirt pollutant attachments such as the fume side coking of heating surface epidermis, crust and bonding as far as possible, guarantee the efficient heat transfer of each section of heating surface.
Fluidized-bed combustion boiler of the present invention adopts the CFB type of furnace global design concept of the low fluidizing velocity of 3.5-4.6m/s, wherein First air part is with flue gas recirculation pipe, flue gas recycled is the clean flue gas of air-introduced machine outlet, also easily extensible is to the flue gas recirculation incorporation way of Secondary Air, to obtain the emulsion zone lower combustion mode of relatively hypoxia, be used for producing to catching fire and the integrated fuel heat release inhibitory action of burnout, avoid and prevent bed temperature in the inner too early stove that appearance is very high of burner hearth, to realize the equilibrium of overall furnace temperature; Under the assistance of grey cyclic process, utilize Secondary Air deep-graded and flue gas recirculation to suppress the effect of burning, make the combustion process of whole boiler possess best efficient low nitrogen burning behavior, the furnace temperature controllability reflected will significantly be better than homotype fluid bed.
Compared with prior art, the present invention has the following advantages:
(1) adopt flue gas recirculating technique, on the one hand adjustable bed temperature, avoid bed temperature in the inner too early stove that appearance is very high of burner hearth, realize the balance of overall furnace temperature; The emulsion zone lower combustion mode of relatively hypoxia can be obtained on the other hand, ensure reducing atmosphere, suppress NO xgeneration;
(2) very high wall with refractory lining, refracto height is adopted to arrange or overall adiabatic furnace arranges, arranges with low flow velocity in stove, flue gas recirculation arranges and combines, good degree and zoning burning can be realized, and the effective bed temperature that regulates balances, and realizes the smooth combustion that different fuel comprises unburnable coal, rubbish and the poor fuel of other physicochemical property;
(3) low-nitrogen discharged: employing flue gas recirculation, Secondary Air deep-graded technology combine, realize the efficient low nitrogen burning behavior of whole boiler, under the pattern relying on low nitrogen burning completely, described CFBB all can realize NO under the burning condition of different fuel xburning is no more than 180mg/m 3, NO during individual fuel burning xdischarge can reach 100 mg/m 3left and right; Reserve SCR installation site in described second flue gas ascent stage, described grey multi-cycle separation device and material returning device battered leg have been installed and has reserved SNCR and spray ammonia position, estimate, when low nitrogen burning mode and SCR/SNCR combine, can NO be realized x< 50 mg/m 3ultra-clean discharge;
(4) heating surface wear is few, and can prevent contamination, slagging scorification and corrosion, and boiler operatiopn stability is high;
(5) fuel tolerance is wide: be different from big-and-middle-sized power station CFB boiler, described CFBB belongs to the coal-fired CFB boiler of back yard industry or waste incineration CFB boiler, higher clean emission performance is had than the conventional solid fuel CFB type of furnace, stronger operation stability, with wide in range fuel adaptive capacity, adaptable heat output of fuel scope reaches 750Kcal ~ 6000Kcal.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
A kind of specific cycle fluidized-bed combustion boiler with flue gas recirculation as shown in Figure 1, comprise the separator 2 be communicated with burner hearth 1, the top of separator 2 is communicated with three vertical flues of afterbody, bottom is communicated with burner hearth 1 by returning charge plate 3, the end of vertical flue connects deduster 8 and air-introduced machine 9 successively, and the outlet of air-introduced machine 9 is communicated with bottom burner hearth 1 by flue gas recirculation pipe 10.
Wherein separator 2 is eccentric scroll casing type efficient flying dust multi-cycle separation device; Water-cooled evaporimeter 4 and superheater 5 is fixed with from top to bottom in first vertical flue in three vertical flues of afterbody, superheater 5 and economizer 6 is fixed with from down to up in second vertical flue, economizer 6 and air preheater 7 is fixed with from top to bottom in 3rd flue, wherein the bottom of first and second vertical flue is provided with expansion chamber 11, and the top of second and third vertical flue is reserved with except nitre space; Burner hearth 1 is poured into a mould by castable refractory, or is overall adiabatic furnace structure; The entrance of separator 2 and material returning device 3 returning charge battered leg have reserved SNCR denitration device spray ammonia position respectively; What the vertical flue of afterbody have employed Large Diameter Pipeline, wide pitch and high flow rate arranges structure.

Claims (6)

1. the specific cycle fluidized-bed combustion boiler with flue gas recirculation, comprise the separator (2) be communicated with burner hearth (1), the top of separator (2) is communicated with three vertical flues of afterbody, bottom is communicated with burner hearth (1) by returning charge plate (3), the end of vertical flue connects deduster (8) and air-introduced machine (9) successively, it is characterized in that, the outlet of described air-introduced machine (9) is communicated with burner hearth (1) bottom by flue gas recirculation pipe (10).
2. the specific cycle fluidized-bed combustion boiler with flue gas recirculation according to claim 1, is characterized in that, described separator (2) is eccentric scroll casing type efficient flying dust multi-cycle separation device.
3. the specific cycle fluidized-bed combustion boiler with flue gas recirculation according to claim 1 and 2, it is characterized in that, water-cooled evaporimeter (4) and superheater (5) is fixed with from top to bottom in first vertical flue in three described vertical flues of afterbody, superheater (5) and economizer (6) is fixed with from down to up in second vertical flue, economizer (6) and air preheater (7) is fixed with from top to bottom in 3rd flue, wherein the bottom of first and second vertical flue is provided with expansion chamber (11), and the top of second and third vertical flue is reserved with except nitre space.
4. the specific cycle fluidized-bed combustion boiler with flue gas recirculation according to claim 1 and 2, is characterized in that, described burner hearth (1) is poured into a mould by castable refractory, or is overall adiabatic furnace structure.
5. the specific cycle fluidized-bed combustion boiler with flue gas recirculation according to claim 1 and 2, is characterized in that, the entrance of described separator (2) and material returning device (3) returning charge battered leg have reserved SNCR denitration device spray ammonia position respectively.
6. the specific cycle fluidized-bed combustion boiler with flue gas recirculation according to claim 1 and 2, is characterized in that, what the vertical flue of described afterbody have employed Large Diameter Pipeline, wide pitch and high flow rate arranges structure.
CN201410813337.4A 2014-12-24 2014-12-24 Special circulating fluidized bed boiler with flue gas recirculation Pending CN104456545A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410813337.4A CN104456545A (en) 2014-12-24 2014-12-24 Special circulating fluidized bed boiler with flue gas recirculation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410813337.4A CN104456545A (en) 2014-12-24 2014-12-24 Special circulating fluidized bed boiler with flue gas recirculation

Publications (1)

Publication Number Publication Date
CN104456545A true CN104456545A (en) 2015-03-25

Family

ID=52903031

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410813337.4A Pending CN104456545A (en) 2014-12-24 2014-12-24 Special circulating fluidized bed boiler with flue gas recirculation

Country Status (1)

Country Link
CN (1) CN104456545A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104791807A (en) * 2015-04-28 2015-07-22 无锡华光锅炉股份有限公司 Solid fuel gasification incineration boiler
CN105627300A (en) * 2016-02-05 2016-06-01 广东省特种设备检测研究院 Energy-saving environment-friendly circulating fluidized bed system
CN105642101A (en) * 2016-01-27 2016-06-08 西安航天源动力工程有限公司 Flue gas recirculation and SNCR joint denitration process system
CN107420925A (en) * 2017-07-07 2017-12-01 江苏盐环实业有限公司 A kind of environmentally friendly novel denitration desulphurization plant
WO2021120465A1 (en) * 2019-12-21 2021-06-24 上海康恒环境股份有限公司 Flue gas backflow system of waste incineration waste heat boiler

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104791807A (en) * 2015-04-28 2015-07-22 无锡华光锅炉股份有限公司 Solid fuel gasification incineration boiler
CN105642101A (en) * 2016-01-27 2016-06-08 西安航天源动力工程有限公司 Flue gas recirculation and SNCR joint denitration process system
CN105627300A (en) * 2016-02-05 2016-06-01 广东省特种设备检测研究院 Energy-saving environment-friendly circulating fluidized bed system
CN107420925A (en) * 2017-07-07 2017-12-01 江苏盐环实业有限公司 A kind of environmentally friendly novel denitration desulphurization plant
WO2021120465A1 (en) * 2019-12-21 2021-06-24 上海康恒环境股份有限公司 Flue gas backflow system of waste incineration waste heat boiler

Similar Documents

Publication Publication Date Title
CN101113816B (en) Biomass circulating fluid bed burning method and biomass circulating fluid bed boiler
CN104456545A (en) Special circulating fluidized bed boiler with flue gas recirculation
CN101949535A (en) Low-ratio biomass circulating fluidized bed boiler and combustion method thereof
CN203628635U (en) Supercritical circulating fluidized bed boiler
CN108758651A (en) A kind of circulating fluidized bed boiler suitable for waste incineration
CN101586799A (en) Moderate temperature moderate voltage steam boiler capable of burning down the blast furnace gas
CN204420993U (en) With the specific cycle fluidized-bed combustion boiler of flue gas recirculation
CN100434798C (en) Internally circulating fluidized reburning device for fly ash based on high temperature separation
CN111981473A (en) Slag burnout system and method of biomass boiler
CN104501177A (en) Waste incinerating circulating fluidized bed boiler
CN100441952C (en) Composite circulating fluidized bed system for high performance clean burning of urban domestic garbage
CN207378803U (en) A kind of garbage burning boiler superheater system
CN102818247B (en) Efficient steam boiler for gasification and combined combustion of pulverized coal
CN104595894A (en) System and method for solving high-sodium coal combustion contamination by low-wall-temperature heat exchange surface
CN104990072A (en) Efficient and low NOx emission fluidized bed boiler
CN204756912U (en) Fluidized bed boiler that high -efficient low NOx discharged
CN109058983A (en) Recirculating fluidized bed combustion with meagre oxygen catalysis oxidation fractional combustion boiler system and method
CN206094052U (en) Bed coal fired boiler economizer is vulcanized in high -efficient circulation
CN206094053U (en) Energy -conserving economizer of bed coal fired boiler is vulcanized in circulation
CN203147745U (en) Integrated hearth and flue biomass fluidized bed boiler
CN203893192U (en) Heat recovery device of garbage incinerator of circulating fluid bed
CN206430166U (en) Waste incinerator secondary blast device
CN207922209U (en) Medium temperature thermal energy efficiently utilizes fluidized-bed combustion boiler
CN106247324B (en) Efficient circulating fluid bed coal-burning boiler coal economizer
CN207880844U (en) A kind of waste incineration CFB boiler of cyclone separator and membrane type separation apparatuses in series

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20150325