US20090084294A1 - Combustion System and Process - Google Patents

Combustion System and Process Download PDF

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Publication number
US20090084294A1
US20090084294A1 US11/940,575 US94057507A US2009084294A1 US 20090084294 A1 US20090084294 A1 US 20090084294A1 US 94057507 A US94057507 A US 94057507A US 2009084294 A1 US2009084294 A1 US 2009084294A1
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US
United States
Prior art keywords
fired
burners
air
oxy
reburn
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.)
Abandoned
Application number
US11/940,575
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English (en)
Inventor
Hamid Sarv
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.)
Babcock and Wilcox Power Generation Group Inc
Original Assignee
Babcock and Wilcox Power Generation Group Inc
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
Priority to US11/940,575 priority Critical patent/US20090084294A1/en
Application filed by Babcock and Wilcox Power Generation Group Inc filed Critical Babcock and Wilcox Power Generation Group Inc
Assigned to THE BABCOCK & WILCOX COMPANY reassignment THE BABCOCK & WILCOX COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SARV, HAMID
Priority to CA002611245A priority patent/CA2611245A1/en
Priority to AU2007237340A priority patent/AU2007237340B2/en
Priority to DK07254698.9T priority patent/DK1936269T3/da
Priority to PL07254698T priority patent/PL1936269T3/pl
Priority to PT72546989T priority patent/PT1936269E/pt
Priority to ES07254698T priority patent/ES2427154T3/es
Priority to EP07254698.9A priority patent/EP1936269B1/en
Priority to MX2007015620A priority patent/MX2007015620A/es
Priority to RU2007145537/06A priority patent/RU2007145537A/ru
Priority to KR1020070128330A priority patent/KR20080053908A/ko
Priority to NO20076395A priority patent/NO20076395L/no
Assigned to CREDIT SUISSE, CAYMAN ISLANDS BRANCH, AS COLLATERAL AGENT reassignment CREDIT SUISSE, CAYMAN ISLANDS BRANCH, AS COLLATERAL AGENT AFTER-ACQUIRED INTELLECTUAL PROPERTY SECURITY AGREEMENT (THIRD SUPPLEMENTAL FILING) Assignors: BABCOCK & WILCOX POWER GENERATION GROUP, INC. (FORMERLY KNOWN AS THE BABCOCK & WILCOX COMPANY)
Assigned to THE BABCOCK & WILCOX COMPANY reassignment THE BABCOCK & WILCOX COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SARV, HAMID
Assigned to BABCOCK & WILCOX POWER GENERATION GROUP, INC. reassignment BABCOCK & WILCOX POWER GENERATION GROUP, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: THE BABCOCK & WILCOX COMPANY
Publication of US20090084294A1 publication Critical patent/US20090084294A1/en
Assigned to BABCOCK & WILCOX CHINA HOLDINGS, INC., BABCOCK & WILCOX DENMARK HOLDINGS, INC., BABCOCK & WILCOX EBENSBURG POWER, INC., BABCOCK & WILCOX INTERNATIONAL SALES AND SERVICE CORPORATION, BABCOCK & WILCOX INTERNATIONAL, INC., NATIONAL ECOLOGY COMPANY, POWER SYSTEMS OPERATIONS, INC., REVLOC RECLAMATION SERVICE, INC., DIAMOND POWER INTERNATIONAL, INC., DIAMOND POWER AUSTRALIA HOLDINGS, INC., DIAMOND POWER CHINA HOLDINGS, INC., DIAMOND POWER EQUITY INVESTMENTS, INC., THE BABCOCK & WILCOX COMPANY, B & W SERVICE COMPANY, NORTH COUNTY RECYCLING, INC., AMERICON EQUIPMENT SERVICES, INC., AMERICON, INC., BABCOCK & WILCOX CONSTRUCTION CO., INC., BABCOCK & WILCOX EQUITY INVESTMENTS, INC., PALM BEACH RESOURCE RECOVERY CORPORATION, APPLIED SYNERGISTICS, INC., DIAMOND OPERATING CO., INC. reassignment BABCOCK & WILCOX CHINA HOLDINGS, INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH
Assigned to BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT reassignment BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT NOTICE OF GRANT OF SECURITY INTEREST IN PATENTS Assignors: BABCOCK & WILCOX POWER GENERATION GROUP, INC. (F.K.A. THE BABCOCK & WILCOX COMPANY)
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/08—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases using flares, e.g. in stacks
    • 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 
    • F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
    • F23C6/045—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure
    • F23C6/047—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure with fuel supply in stages
    • 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 
    • F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/08—Disposition of burners
    • 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
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • 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

Definitions

  • the present invention relates in general to a method and apparatus for combusting a fossil fuel such as coal, and in particular to new and useful method and apparatus for reducing the formation of nitrogen oxides during the combustion process.
  • NO x oxides of nitrogen
  • EPA U.S. Environmental Protection Agency
  • combustion air and a fossil fuel are mixed and provided to a main flame zone within a furnace.
  • NO x a byproduct of the combustion, is formed when naturally occurring nitrogen in the fuel and/or molecular nitrogen in the combustion air oxidize.
  • Fuel reburning is a technology capable of reducing NO x emissions.
  • the technology includes providing an oxygen-deficient secondary combustion reburn zone above an oxygen-rich main combustion zone.
  • Supplementary fuel provided to the reburn zone generates hydrocarbon radicals, amines, and cyanic species that react with incoming main combustion products to convert NO x to N 2 .
  • Additional air may then be provided by overfire air (OFA) ports, placed above the reburn zone, to combust the remaining fuel and combustible gases.
  • OFA overfire air
  • Fuel reburn applications generally utilize flue gas recirculation (FGR) technology to reduce NO x emission.
  • Flue gas from downstream of boiler is recirculated via conduits back to the secondary combustion zone as an oxygen-lean carrier gas, thereby maintaining a fuel-rich environment and enhancing the fuel penetration and mixing with the main combustion zone gases and products.
  • Quenching, resulting from utilizing flue gas from downstream of the boiler outlet as a carrier gas, further inhibits NO x formation in the reburn zone.
  • Pulverized coal-fired boilers and devices similar thereto generally use two or three types of gaseous streams.
  • the first is the primary air stream, typically constituting from about 10 to 20% percent of the overall amount of gas introduced into the combustion chamber.
  • the main purpose of the primary air is to convey fuel (e.g., pulverized coal) to the burner.
  • the flow rate is therefore kept sufficient to achieve the function of particle transport.
  • the transport gas need not contain an oxidant, although air is generally used due to cost and availability.
  • the secondary stream is generally an air stream injected at the burner level, around or near the primary air/fuel mixture.
  • the primary purpose of this stream is to provide oxidant to the fuel for combustion. Conventionally, this stream has been air due to cost and availability.
  • a third gaseous stream, generally used in air staging application is injected downstream of the burners in a secondary combustion zone.
  • This third stream generally injected through overfire air (OFA) port, has conventionally been air due to cost and availability.
  • OFA port In air staging application use of OFA port has shown to reduce NO x by about 20 to about 35 percent. Staging generally involves operating the main combustion zone fuel-rich, sub-stoichiometric in the range of about 0.75 to about 0.95, and a second zone fuel-lean, super-stoichiometric in the range of about 1.10 to about 1.25.
  • An additional NO x reduction technique involves injecting air and a supplementary fossil fuel above a generally oxidant rich primary combustion zone, stoichiometric ratio of at least 1.0, to create a locally oxidant deficient re-burn zone.
  • the supplement fuel generates reactive species which inhibit the production of NO x .
  • Re-burning fuel generally is injected into a zone having flue gas temperatures of about 1250° to about 1650° C. (about 2300° to about 3000° F.), and the efficiency of NO x reduction has been shown to generally increase with an increase in injection temperature and longer re-burn zone residence times.
  • Fuel re-burning techniques can result in up to 60% NO x reduction depending on the commercial systems. Additional air may then be introduced above the re-burn zone through overfire air ports to burn out the combustible matter.
  • the present invention provides processes and equipment for fossil fuel combustion wherein the NO x byproduct of combustions is greatly reduced, potentially eliminating the need for downstream techniques such as SCR and SNCR.
  • the present invention provides a method for reducing the formation of nitrogen oxides emissions from the combustion of a fossil fuel in a nitrogen laden gas.
  • the method comprising the steps of providing a furnace wherein fossil fuel is combusted, providing multiple rows of air fired burners, providing a row of oxy-fired reburn burners downstream of the last row of the air fired burners, providing a row of over fire air ports downstream of the row of oxy-fired reburn burners, supplying the multiple rows of air fired burners with air and a fossil fuel and a stoichiometry of less than 1.0, supplying the oxy fired reburn burners with a fossil fuel and a gaseous stream comprising at least 90% oxygen in sufficient quantity to produce a reburn stoichiometry between about 0.35 and 0.65, and supplying the row of overfire air ports with sufficient air to produce a combustion stoichiometry above 1.10 downstream of the overfire air ports.
  • the present invention provides a combustion furnace comprising a plurality of air fired fossil fuel burners arranged in at least two rows, the improvement comprising replacing the uppermost row of air fired burners with a row of oxy-fired reburn burners.
  • the present invention provides a method of controlling nitrogen oxides emissions resulting from the combustion of a fossil fuel in a utility boiler, the method including the step of staging combustion to prevent the formation of nitrogen oxides precursors by providing at least two rows of air fired burner, each of the burners being supplied with air and a fossil fuel and combusted at a stoichiometry of less than 1.0, and by providing a row of overfire air ports downstream of the last row of the at least two rows of air fired burners, wherein the overfire air ports provide sufficient air to create a combustion stoichiometry of greater than 1.10, the improvement comprising providing a oxy-fired reburn burner downstream of air fired burners and upstream of the over fire air ports, providing the oxy-fired reburn burner with a fossil fuel and a gaseous steam comprising at least 90% oxygen, and operating the oxy-fired reburn burner to produce a combustion stoichiometry of between about 0.35 and 1.0 at the outlet of the oxy fired
  • FIG. 1 is a perspective view of one embodiment of a furnace according to the present invention in which all burners are positioned in one wall of the unit.
  • FIG. 2 is a perspective view of another embodiment of a furnace according to the present invention in which burners are located in opposing walls of the unit.
  • FIG. 3 is a perspective view of yet another embodiment of a furnace according to the present invention in which all burners are positioned in a tangential firing arrangement.
  • FIG. 4 is a side view, portions cut away, of a single wall embodiment of a furnace according to the present invention in operation.
  • FIGS. 1-3 portray three relatively common solid fuel furnace configurations, each of which can be used in the present invention.
  • FIG. 1 is a schematic representation of a single wall-fired unit 10
  • FIG. 2 is a schematic representation of a opposed wall-fired unit 20
  • FIG. 3 is a schematic representation of a tangential (or corner fired) unit 30 .
  • Each of these embodiments provides front wall 11 , rear wall 13 , and side walls 15 and 17 .
  • Tangential unit 30 also includes four corner walls 19 .
  • Single wall-fired unit 10 incorporates primary burners 12 , re-burn burners 14 and OFA ports 16 in front wall 11 .
  • additional OFA ports may be located in rear wall 13 of the single wall-fired unit.
  • Opposed wall-fired unit 20 incorporates primary burners 12 a , re-burn burners 14 a and OFA ports 16 a in front wall 11 and incorporates primary burners 12 b , re-burn burners 14 b , and OFA ports 16 b in rear wall 13 .
  • Tangential unit 30 incorporates primary burners 12 a and 12 b , re-burn burners 14 a and 14 b , and OFA ports 16 a and 16 b in opposing corner walls 19 ; for the sake of clarity, only those burners and ports in one set of opposing corner walls 19 have been shown. Variations on these arrangements also are possible.
  • the upstream (lower) rows of ports incorporate primary burners 12 , i.e., burners configured to burn fuel in the presence of an oxidant gas such as air that includes a relatively large percentage of N 2 , while a downstream row of ports incorporates re-burn burners 14 that employ O 2 -enriched oxidant gas.
  • the term row, used hereinthroughout denotes an imaginary line connecting a series of similar burners. While variation in individuals burner elevation may occur in practice, minor variation are understood to be within the scope of the present invention.
  • OFA ports 16 are generally located downstream of re-burn burners 14 . Once the output of the furnace, flue gas 18 , passes OFA ports 16 , it is directed out of the furnace. While the present invention provides exceptional NO x removal, making additional processing steps associated with SCR or SCNR unnecessary to achieve current NO x emission regulation levels, use of such subsequent processing step may prove beneficial if cap and trade systems for NOx emissions become more established.
  • FIG. 4 portrays an alternative construction for a single wall-fired furnace unit.
  • pulverized coal is used as an exemplary solid fuel, although this is to be considered non-limiting because the ordinarily skilled artisan is aware of a variety of solid fuels that can be combusted in such units.
  • a combined stream of PC and oxidant gas can be supplied to furnace unit 50 via first conduit 32 and enter primary burners 12 disposed in upstream ports 22 .
  • the feed stream typically is provided at sufficient velocity to entrain the pulverized coal.
  • the oxidant gas component of the feed stream typically air, generally comprises a significant amount of N 2 , typically in the 70 percentile. Combustion of this feed stream forms first combustion zone 42 .
  • the combustion zone 42 generally creates a fuel rich environment, i.e., one which has a stoichiometric ratio of less than 1.0, preferably between about 0.8 to 1.0. In alternative embodiments, the stoichiometry of the first combustion zone 42 can be above 1.0 and up to about 1.10.
  • a second combined stream of PC and oxidant gas can be supplied to unit 50 via second conduit 34 and enter re-burn burner 14 disposed in downstream port 24 .
  • the feed stream typically is provided at sufficient velocity to entrain the pulverized coal.
  • Oxidant gas in this stream generally has a reduced concentration of N 2 , preferably less than 50%, wherein the reduced concentrations are a result of combining recycled flue gas and a relatively pure oxygen stream, and most preferably essentially free of N 2 in embodiments wherein a steam of relatively pure oxygen is utilized.
  • the oxidant gas is essentially pure O 2
  • it can be delivered by means such as a spud or lance; see, for example, U.S. Patent Publ. No. 2006/0257800 A1 wherein a multi-bladed injection device for the introduction of O 2 to re-burn burner 14 is described.
  • Combustion of the feed stream forms a second combustion zone 44 in the vicinity of the re-burn burner with an increased local flame temperature.
  • the second feed stream can include O 2 , and/or re-circulated flue gas.
  • Conduits can be installed anywhere along the boiler system to allow desired quantities of flue gas to be re-circulated into unit 50 .
  • Re-circulated flue gas can be premixed with O 2 or injected directly into second combustion zone 44 .
  • the stoichiometric ratio at re-burn burner 14 generally depends on the oxidant gas composition and feed stream flow rate.
  • re-burn burner 14 is operated fuel-rich, such that the stoichiometric ratio is below 1.0 and preferably between about 0.35 and 0.85.
  • non-oxidizing gases such as N 2 , H 2 O and CO 2 are introduced to re-burn burner 14 via transport air and/or one or more recycled flue gas streams.
  • a stoichiometry in the range of about 0.35 to about 0.65 is preferred.
  • the stoichiometry of re-burn burner 14 is maintained at or below that which would be utilized in an otherwise equivalent air-fired re-burn burner.
  • the combined stoichiometric ratio of the combustion zones resulting from primary burners 12 and re-burn burner 14 preferably is maintained between about 0.6 and 1.0 for maximum NO x reduction.
  • Additional oxidizing gas is brought to unit by conduit 26 and introduced downstream from second combustion zone 44 via OFA port 16 .
  • the oxidizing gas introduced via OFA port 16 raises the overall combustion stoichiometry within unit 50 to at least about 1.10, which assists in burning out combustibles such as chars, hydrocarbons, and CO.
  • OFA port 16 commonly can be located at a position where the flue gas temperature is about 980° to about 1550° C. (about 1800° to 2800° F.) to facilitate achieving complete combustion.
  • an existing furnace can be retrofitted so as to have the above-described configuration.
  • an existing furnace need not have new or additional burner ports installed.
  • the units shown in FIGS. 1 to 4 can be viewed either as newly manufactured units or previously manufactured units having undergone retrofitting.
  • One advantage of the present system and process is that overall use of O 2 , either as pure gas or as an enriching component of other gas(es), is reduced by limiting its use to deeply staged re-burn burners in the combustion zone as opposed to, e.g., technologies that use it throughout the main combustion zone. More specifically, total O 2 flow requirement for the re-burn burners is equivalent to or less than about 23% of the substituted air mass flow rate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Environmental & Geological Engineering (AREA)
  • Combustion Of Fluid Fuel (AREA)
US11/940,575 2006-12-11 2007-11-15 Combustion System and Process Abandoned US20090084294A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US11/940,575 US20090084294A1 (en) 2006-12-11 2007-11-15 Combustion System and Process
CA002611245A CA2611245A1 (en) 2006-12-11 2007-11-20 Combustion system and process
AU2007237340A AU2007237340B2 (en) 2006-12-11 2007-12-03 Combustion System and Process
DK07254698.9T DK1936269T3 (da) 2006-12-11 2007-12-04 Forbrændingskedel og forbrændingsfremgangsmåde ved anvendelse af oxyfuel-reburn brændere
PL07254698T PL1936269T3 (pl) 2006-12-11 2007-12-04 Piec do spalania i sposób spalania wykorzystujący palniki spalania wtórnego w tlenie
PT72546989T PT1936269E (pt) 2006-12-11 2007-12-04 Forno de combustão e método de combustão usando queimadores de requeima
ES07254698T ES2427154T3 (es) 2006-12-11 2007-12-04 Horno de combustión y método de combustión que usa quemadores de requemado de oxicombustible
EP07254698.9A EP1936269B1 (en) 2006-12-11 2007-12-04 Combustion furnace and combustion method using oxy-fuel reburn burners
MX2007015620A MX2007015620A (es) 2006-12-11 2007-12-07 Sistema y proceso de combustion.
RU2007145537/06A RU2007145537A (ru) 2006-12-11 2007-12-10 Система и способ сжигания топлива
NO20076395A NO20076395L (no) 2006-12-11 2007-12-11 Forbrenningssystem og -fremgangsmåte
KR1020070128330A KR20080053908A (ko) 2006-12-11 2007-12-11 연소로와 질소산화물의 저감방법 및 질소산화물 방출의제어방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US87432606P 2006-12-11 2006-12-11
US11/940,575 US20090084294A1 (en) 2006-12-11 2007-11-15 Combustion System and Process

Publications (1)

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US20090084294A1 true US20090084294A1 (en) 2009-04-02

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US11/940,575 Abandoned US20090084294A1 (en) 2006-12-11 2007-11-15 Combustion System and Process

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US (1) US20090084294A1 (da)
EP (1) EP1936269B1 (da)
KR (1) KR20080053908A (da)
AU (1) AU2007237340B2 (da)
CA (1) CA2611245A1 (da)
DK (1) DK1936269T3 (da)
ES (1) ES2427154T3 (da)
MX (1) MX2007015620A (da)
NO (1) NO20076395L (da)
PL (1) PL1936269T3 (da)
PT (1) PT1936269E (da)
RU (1) RU2007145537A (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090214989A1 (en) * 2008-02-25 2009-08-27 Larry William Swanson Method and apparatus for staged combustion of air and fuel
CN102200275A (zh) * 2011-04-12 2011-09-28 上海理工大学 褐煤脱水提质和降低氮氧化物排放的燃烧装置及其方法
US20150086930A1 (en) * 2009-12-11 2015-03-26 Power & Control Solutions, Inc. System and method for retrofitting a burner front and injecting a second fuel into a utility furnace

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Publication number Priority date Publication date Assignee Title
FI128749B (en) 2016-07-01 2020-11-30 Teknologian Tutkimuskeskus Vtt Oy Air arrangement above fire and bubbling swirl bed oven
CN109539545B (zh) * 2018-11-23 2021-05-14 兖矿集团有限公司 一种炉内脱硫脱硝除尘的常压燃煤锅炉及其处理方法
CN111804138A (zh) * 2020-08-25 2020-10-23 焦作市华康糖醇科技有限公司 一种生物质锅炉烟气脱硝系统及其使用工艺

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US4986199A (en) * 1989-12-21 1991-01-22 Kawasaki Jukogyo Kabushiki Kaisha Method for recovering waste gases from coal partial combustor
US5020454A (en) * 1990-10-31 1991-06-04 Combustion Engineering, Inc. Clustered concentric tangential firing system
US5823124A (en) * 1995-11-03 1998-10-20 Gas Research Institute Method and system to reduced NOx and fuel emissions from a furnace
US6058855A (en) * 1998-07-20 2000-05-09 D. B. Riley, Inc. Low emission U-fired boiler combustion system
US6206685B1 (en) * 1999-08-31 2001-03-27 Ge Energy And Environmental Research Corporation Method for reducing NOx in combustion flue gas using metal-containing additives
US7438005B2 (en) * 2002-05-15 2008-10-21 Praxair Technology, Inc. Low NOx combustion

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US6085674A (en) * 1999-02-03 2000-07-11 Clearstack Combustion Corp. Low nitrogen oxides emissions from carbonaceous fuel combustion using three stages of oxidation
US6699030B2 (en) 2001-01-11 2004-03-02 Praxair Technology, Inc. Combustion in a multiburner furnace with selective flow of oxygen
US7491055B2 (en) * 2005-05-11 2009-02-17 Babcock & Wilcox Power Generation Group, Inc. Oxy-fuel reburn: a method for NOx reduction by fuel reburning with oxygen

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
US4986199A (en) * 1989-12-21 1991-01-22 Kawasaki Jukogyo Kabushiki Kaisha Method for recovering waste gases from coal partial combustor
US5020454A (en) * 1990-10-31 1991-06-04 Combustion Engineering, Inc. Clustered concentric tangential firing system
US5823124A (en) * 1995-11-03 1998-10-20 Gas Research Institute Method and system to reduced NOx and fuel emissions from a furnace
US6058855A (en) * 1998-07-20 2000-05-09 D. B. Riley, Inc. Low emission U-fired boiler combustion system
US6206685B1 (en) * 1999-08-31 2001-03-27 Ge Energy And Environmental Research Corporation Method for reducing NOx in combustion flue gas using metal-containing additives
US7438005B2 (en) * 2002-05-15 2008-10-21 Praxair Technology, Inc. Low NOx combustion

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090214989A1 (en) * 2008-02-25 2009-08-27 Larry William Swanson Method and apparatus for staged combustion of air and fuel
US7775791B2 (en) * 2008-02-25 2010-08-17 General Electric Company Method and apparatus for staged combustion of air and fuel
US20150086930A1 (en) * 2009-12-11 2015-03-26 Power & Control Solutions, Inc. System and method for retrofitting a burner front and injecting a second fuel into a utility furnace
CN102200275A (zh) * 2011-04-12 2011-09-28 上海理工大学 褐煤脱水提质和降低氮氧化物排放的燃烧装置及其方法

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Publication number Publication date
AU2007237340A1 (en) 2008-06-26
MX2007015620A (es) 2009-02-12
PL1936269T3 (pl) 2013-11-29
EP1936269B1 (en) 2013-06-12
EP1936269A1 (en) 2008-06-25
NO20076395L (no) 2008-06-12
CA2611245A1 (en) 2008-06-11
KR20080053908A (ko) 2008-06-16
RU2007145537A (ru) 2009-06-20
PT1936269E (pt) 2013-09-02
DK1936269T3 (da) 2013-09-08
ES2427154T3 (es) 2013-10-29
AU2007237340B2 (en) 2013-04-04

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