CN108240619A - A kind of flue gas recirculation system using hi-temp hi-effective cyclone separator - Google Patents

A kind of flue gas recirculation system using hi-temp hi-effective cyclone separator Download PDF

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Publication number
CN108240619A
CN108240619A CN201810242612.XA CN201810242612A CN108240619A CN 108240619 A CN108240619 A CN 108240619A CN 201810242612 A CN201810242612 A CN 201810242612A CN 108240619 A CN108240619 A CN 108240619A
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CN
China
Prior art keywords
cyclone separator
flue gas
boiler
temp
gas recirculation
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
CN201810242612.XA
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Chinese (zh)
Inventor
张翔
闫凯
吴乃新
徐雪元
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Shanghai Boiler Works Co Ltd
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Shanghai Boiler Works 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 Shanghai Boiler Works Co Ltd filed Critical Shanghai Boiler Works Co Ltd
Priority to CN201810242612.XA priority Critical patent/CN108240619A/en
Publication of CN108240619A publication Critical patent/CN108240619A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/003Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for pulverulent fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/027Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING 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
    • F23L7/00Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F23L7/007Supplying oxygen or oxygen-enriched air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2202/00Fluegas recirculation
    • F23C2202/30Premixing fluegas with combustion air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00Intercepting solids
    • F23J2217/40Intercepting solids by cyclones
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/32Direct CO2 mitigation
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cyclones (AREA)
  • Chimneys And Flues (AREA)

Abstract

The invention discloses a kind of flue gas recirculation systems using hi-temp hi-effective cyclone separator, it is characterized in that, including passing through the sequentially connected boiler of flue gas recirculation pipeline, hi-temp hi-effective cyclone separator, circulating fan, the mixing arrangement with pure oxygen pipeline, the dust-exhausting port connection cyclone separator ash-storing bin of hi-temp hi-effective cyclone separator, the ash separated from ash-storing bin outlet enter boiler by the blasting action of circulating fan;The port of export of circulating fan connects mixing arrangement, cyclone separator ash-storing bin respectively, and mixing arrangement is connected with the boiler-burner of boiler, and cyclone separator ash-storing bin connects respectively with the burner hearth of boiler, boiler back end ductwork.The simple system, small investment, transformation are convenient, and boiler in-furnace temperature and Slagging degree effectively can be adjusted, and reduce wind turbine abrasion, improve economy and the safety of boiler operatiopn.

Description

A kind of flue gas recirculation system using hi-temp hi-effective cyclone separator
Technical field
The present invention relates to a kind of flue gas recirculation systems using hi-temp hi-effective cyclone separator, and it is oxygen-enriched to belong to coal-burning boiler Combustion field.
Background technology
The discharge for reducing greenhouse gases is a big hot spot of the world today.The discharge of carbon dioxide is wherein reduced, especially It is the task of top priority to reduce the carbon dioxide generated from coal burning.Researchers are to carbon dioxide capture and Plugging Technology Applied thus A large amount of research is carried out, wherein oxygen-enriched combusting is one of main means and mode in carbon dioxide capture and Plugging Technology Applied.
Oxygen-enriched combustion technology is an efficient energy-saving combustion technology.Refer in existing station boiler system-based, with height The O of purity2Instead of combustion air.The rate-of flow and heat-transfer character in burner hearth are adjusted using flue gas recirculation simultaneously, height can be obtained CO is rich in up to 85%~95% volumetric concentration2Flue gas, so as to smaller cost condensation compression realize CO after purification2Forever It seals up for safekeeping or recycling long.
In oxygen-enriched combusting, the system of most critical is that flue gas recirculation system, and wherein circulating fan is that this is Key equipment in system.Flue gas is drawn through circulating fan before air preheater and is sent into mixing arrangement and oxygen mix.But It is that directly flue gas is recycled using circulating fan containing the fly ash granule after a large amount of coal dust firings in flue gas, it is a large amount of to fly Ash particle will wear wind turbine, influence the normal operation of wind turbine.A kind of solution is to extract the low-temperature flue gas after deduster out Recycled, at this moment flue gas needs the heating that exchanges heat again, increases cost, and at low load flue gas recirculation system without Method works.Dimension, it is necessary to the fly ash granule in flue gas recirculation system before the removing dedusting that takes measures.
In the industry, cyclone separator is the generated centrifugal force when making high speed rotation using the non-homogenous system of gaseous state, will A kind of dry type gas-solid separation equipment that dust is separated from air-flow.The minimum diameter that particle can cost-effectively be detached can Up to 5 microns.Cyclone separator have it is relatively simple for structure, operation, easy to maintain, steady performance, and again not by containing The limitations such as concentration, temperature, the physical property of dust and gas body, and cost is relatively low, has been widely used in oil, chemical industry, coal, electric power, ring In the industrial productions such as guarantor and metallurgy.Dimension can detach the fly ash granule in circulating flue gas using cyclone separator.
In addition, a problem for comparing concern in boiler combustion is the Slagging problem of heating surface, often through mixing The substances such as kaolin are burnt to reduce the Slagging of heating surface.In tail flue gas, unreacted kaolinite is contained in fly ash granule Soil particle also fails to Efficient Cycle utilization.If self-loopa can be carried out to flying dust, silica alumina ratio in regulating stove, will effectively improve by Hot face prevents the ability of Slagging.
Therefore, it is necessary to the abrasion for taking effective measure to solve circulating fan in flue gas recirculation system in oxygen-enriched combusting is asked Topic, while fly ash granule is efficiently used, these also fail to solve now.It needs to be transformed flue gas recirculation system, come The abrasion of circulating fan is reduced, reduces the Slagging of heating surface, improves economy and the safety of boiler.
Invention content
Problem to be solved by this invention is:Wind turbine wear problem, provides one kind existing for existing flue gas recirculating technique Using the flue gas recirculation system of hi-temp hi-effective cyclone separator, the simple system, small investment, transformation is convenient, in Boiler Furnace Temperature is effectively adjusted, and reduces wind turbine abrasion, improves economy and the safety of boiler operatiopn.
To solve the above-mentioned problems, the technical solution adopted in the present invention is:
A kind of flue gas recirculation system using hi-temp hi-effective cyclone separator, which is characterized in that including by flue gas again The sequentially connected boiler of circulation line, hi-temp hi-effective cyclone separator, circulating fan, the mixing arrangement with pure oxygen pipeline, high temperature The dust-exhausting port connection cyclone separator ash-storing bin of efficient cyclone separator, the ash separated from ash-storing bin outlet pass through circulated air The blasting action of machine enters boiler;The port of export of circulating fan connects mixing arrangement, cyclone separator ash-storing bin, mixing dress respectively It puts and is connected with the boiler-burner of boiler, cyclone separator ash-storing bin connects respectively with the burner hearth of boiler, boiler back end ductwork;Institute It states cyclone separator and includes mutually nested outer barrel, inner cylinder, the bottom of outer barrel is equipped with conic tube, is set on the outside of outer barrel There is inlet tube, the upper end of inner cylinder is equipped with exhaust pipe, and the outside of exhaust pipe is equipped with secondary separation cylinder.
Preferably, the front side of the boiler back end ductwork is equipped with air preheater, and flue gas recirculation pipeline is from air preheat The front side of device is drawn, and the flue-gas temperature of extraction is 200~550 DEG C.
Preferably, the flue gas flow rate in the inlet tube of the cyclone separator is 10~30m/s.
Preferably, the outside of the inner cylinder of the cyclone separator is equipped with the baffle ring that section is triangle.
Preferably, the lower end of the inner cylinder of the cyclone separator is throat structure, and it is 15~45 ° to inside contract angle.
Preferably, the contact surface of the cyclone separator and flue gas is equipped with ceramic wear-resisting material.
Preferably, angle runner is equipped between the exhaust pipe of the cyclone separator and secondary separation cylinder.
Compared with prior art, the beneficial effects of the invention are as follows:
1. adding a cyclone separator before the circulating fan of flue gas recirculation system, effectively remove in circulating flue gas absolutely Most of particulate matter reduces abrasion of the particulate matter to circulating fan, improves the safety of system, reduces operation and maintenance cost.
2. reducing the Radiant exothermicity in boiler furnace using flue gas recycled, vapor (steam) temperature is effectively adjusted, The system adjustment is sensitive, corresponding rapid.
3. the fly ash granule under being detached using cyclone separator is divided into two-way, a part is re-fed into burner hearth and carries out flying dust certainly Cycle adjusts the silica alumina ratio in inner flue gas of the stove using flying dust, effectively reduces the situation of the flying dust Slagging of stove internal heating surface, separately Deduster that is a part of then passing through boiler tail, is removed.
4. cyclone separator uses double volute import form, Eddy Distribution in cyclone separator can be made symmetrical, stablize whirlpool Stream prevents unstable vortex from generating, advantageously reduces the generation of short circuit phenomenon and reduce the air-teturning mixed phenomenon at dust-exhausting port.
5. installing inner cylinder in cyclone separator additional and utilizing great circulation area, the axial speed of ascending air in inner cylinder is reduced Degree so that particulate matter is not easy to be carried by air-flow and can realize gravitational settling, and secondary point is carried out using the rotating energy in exhaust pipe From further improving the separative efficiency of cyclone separator and reduce the pressure loss of cyclone separator.
Description of the drawings
Fig. 1 is the schematic diagram of the flue gas recirculation system provided by the invention using hi-temp hi-effective cyclone separator;
Fig. 2 is the perspective view of cyclone separator.
Specific embodiment
To be clearer and more comprehensible the present invention, hereby with preferred embodiment, and attached drawing is coordinated to be described in detail below.
Embodiment
As shown in Figure 1, 2, it is a kind of flue gas recirculation system using hi-temp hi-effective cyclone separator provided by the invention, It is included through 1 sequentially connected boiler of flue gas recirculation pipeline, hi-temp hi-effective cyclone separator 2, circulating fan 3, band pure oxygen The mixing arrangement 4 of pipeline 5, the dust-exhausting port connection cyclone separator ash-storing bin 6 of hi-temp hi-effective cyclone separator 2, goes out from ash-storing bin 6 The ash that mouth separates enters boiler by the blasting action of circulating fan 3;The port of export of circulating fan 3 connects mixing dress respectively Put 4, cyclone separator ash-storing bin 6, mixing arrangement 4 is connected with the boiler-burner of boiler, cyclone separator ash-storing bin 6 respectively with The burner hearth of boiler, boiler back end ductwork connection.
As shown in Fig. 2, cyclone separator 2 includes mutually nested outer barrel 201, inner cylinder 202, the bottom of outer barrel 201 Portion is equipped with conic tube 203, and the outside of outer barrel 201 is equipped with inlet tube 206, and the upper end of inner cylinder 202 is equipped with exhaust pipe 205, row The outside of tracheae 205 is equipped with secondary separation cylinder 204.The front side of boiler back end ductwork is equipped with air preheater 7, flue gas recirculation Pipeline 1 is drawn from the front side of air preheater 7, and the flue-gas temperature of extraction is 350~450 DEG C.Flue gas flow rate in inlet tube 206 For 10~30m/s.After flue gas enters in cyclone separator 2, the annular region spiral between inner cylinder 202 and outer barrel 201 It moves downward.The outside of inner cylinder 202 is equipped with the baffle ring 207 that section is triangle, and air-flow can carry after triangle baffle ring The tangential velocity of height rotation is conducive to improve separative efficiency.The lower end of inner cylinder 202 is throat structure, inside contract angle for 15~ 45 °, it is possible to reduce the short circuit phenomenon of exhaust pipe near ports.In 205 outside of exhaust pipe, welded between secondary separation cylinder 204 Connect angle runner 208, the spinning updraft in outside carries particle and secondary point of progress is separated from runner in exhaust pipe 205 From.Cyclone separator 2 and the contact surface of flue gas are equipped with ceramic wear-resisting material, and reach a high temperature the lower requirement used.
Specifically flue gas recirculation process is:
It is arranged in the flue gas recycled pipeline 1 before boiler tail air preheater 7 and flue gas is led into cyclone separator 2, Enter from two imports of cyclone separator 2 and fly ash granule separation carried out in cyclone separator 2, the fly ash granule separated into Enter cyclone separator ash-storing bin 6, the purifying smoke for being removed particle merges from 205 two outlet discharges of exhaust pipe, passes through cycle Purifying smoke is introduced mixing arrangement 4 by wind turbine 3, is entered with the pure oxygen separated in air separator by pure oxygen pipeline 5 and mixed It attaches together to put in 4 and mix, burner is then sent by pipeline, is traveled further into stove, achieve the effect that adjust steam temperature.Whirlwind point The hearth region before stove internal heating surface is carried along by pulverizer coal feeder air-supply from the ash in device ash-storing bin 6, mixes, utilizes with flue gas Silica alumina ratio in fly ash granule regulating stove effectively reduces the flying dust Slagging situation of stove internal heating surface.

Claims (7)

1. a kind of flue gas recirculation system using hi-temp hi-effective cyclone separator, which is characterized in that including being followed again by flue gas The sequentially connected boiler in endless tube road (1), hi-temp hi-effective cyclone separator (2), circulating fan (3), the mixing with pure oxygen pipeline (5) Device (4), the dust-exhausting port connection cyclone separator ash-storing bin (6) of hi-temp hi-effective cyclone separator (2), exports from ash-storing bin (6) The ash separated enters boiler by the blasting action of circulating fan (3);The port of export of circulating fan (3) connects mixing respectively Device (4), cyclone separator ash-storing bin (6), mixing arrangement (4) are connected with the boiler-burner of boiler, cyclone separator storage ash Storehouse (6) connects respectively with the burner hearth of boiler, boiler back end ductwork;The cyclone separator (2) includes mutually nested outer barrel (201), inner cylinder (202), the bottom of outer barrel (201) are equipped with conic tube (203), and the outside of outer barrel (201) is equipped with import It manages (206), the upper end of inner cylinder (202) is equipped with exhaust pipe (205), and the outside of exhaust pipe (205) is equipped with secondary separation cylinder (204)。
2. the flue gas recirculation system of hi-temp hi-effective cyclone separator is applied as described in claim 1, which is characterized in that described The front side of boiler back end ductwork is equipped with air preheater (7), and flue gas recirculation pipeline (1) draws on front side of air preheater (7) Go out, the flue-gas temperature of extraction is 200~550 DEG C.
3. the flue gas recirculation system of hi-temp hi-effective cyclone separator is applied as described in claim 1, which is characterized in that described Flue gas flow rate in the inlet tube (206) of cyclone separator (2) is 10~30m/s.
4. the flue gas recirculation system of hi-temp hi-effective cyclone separator is applied as described in claim 1, which is characterized in that described The outside of the inner cylinder (202) of cyclone separator (2) is equipped with the baffle ring (207) that section is triangle.
5. the flue gas recirculation system of hi-temp hi-effective cyclone separator is applied as described in claim 1, which is characterized in that described The lower end of the inner cylinder (202) of cyclone separator (2) is throat structure, and it is 15~45 ° to inside contract angle.
6. the flue gas recirculation system of hi-temp hi-effective cyclone separator is applied as described in claim 1, which is characterized in that described Cyclone separator (2) and the contact surface of flue gas are equipped with ceramic wear-resisting material.
7. the flue gas recirculation system of hi-temp hi-effective cyclone separator is applied as described in claim 1, which is characterized in that described Angle runner (208) is equipped between the exhaust pipe (205) of cyclone separator (2) and secondary separation cylinder (204).
CN201810242612.XA 2018-03-22 2018-03-22 A kind of flue gas recirculation system using hi-temp hi-effective cyclone separator Pending CN108240619A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109737392A (en) * 2019-01-25 2019-05-10 河南省锅炉压力容器安全检测研究院 The flying dust and clinker for being applicable in the coal-burning boiler with horizontally disposed burner hearth fire system again
CN111237744A (en) * 2020-01-22 2020-06-05 王玉琨 Pure oxygen combustion technology
CN114893766A (en) * 2022-05-27 2022-08-12 清华大学 Cyclone separator for circulating fluidized bed boiler
CN116104457A (en) * 2022-12-27 2023-05-12 清华大学 Gas preparation system and carbon dioxide oil displacement system
CN118009308A (en) * 2024-04-10 2024-05-10 山西吉祥锅炉制造有限公司 Boiler flue gas recirculation device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1959208A (en) * 2006-11-09 2007-05-09 华中科技大学 Boiler system of circulating fluid bed burning in oxygen enrichment
CN101935551A (en) * 2010-06-25 2011-01-05 四川南充兴华机电制造有限公司 Gas purifying device of straw gasification furnace
CN104841229A (en) * 2015-05-19 2015-08-19 青岛科技大学 Combined dust removal device
US20150330622A1 (en) * 2014-05-16 2015-11-19 Chung Yuan Christian University Fluidized bed boiler and method for enhancing furnace efficiency of the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1959208A (en) * 2006-11-09 2007-05-09 华中科技大学 Boiler system of circulating fluid bed burning in oxygen enrichment
CN101935551A (en) * 2010-06-25 2011-01-05 四川南充兴华机电制造有限公司 Gas purifying device of straw gasification furnace
US20150330622A1 (en) * 2014-05-16 2015-11-19 Chung Yuan Christian University Fluidized bed boiler and method for enhancing furnace efficiency of the same
CN104841229A (en) * 2015-05-19 2015-08-19 青岛科技大学 Combined dust removal device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109737392A (en) * 2019-01-25 2019-05-10 河南省锅炉压力容器安全检测研究院 The flying dust and clinker for being applicable in the coal-burning boiler with horizontally disposed burner hearth fire system again
CN111237744A (en) * 2020-01-22 2020-06-05 王玉琨 Pure oxygen combustion technology
CN114893766A (en) * 2022-05-27 2022-08-12 清华大学 Cyclone separator for circulating fluidized bed boiler
CN116104457A (en) * 2022-12-27 2023-05-12 清华大学 Gas preparation system and carbon dioxide oil displacement system
CN118009308A (en) * 2024-04-10 2024-05-10 山西吉祥锅炉制造有限公司 Boiler flue gas recirculation device

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Application publication date: 20180703