US3867909A - Slag prevention air slots in furnace sidewalls - Google Patents

Slag prevention air slots in furnace sidewalls Download PDF

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Publication number
US3867909A
US3867909A US417319A US41731973A US3867909A US 3867909 A US3867909 A US 3867909A US 417319 A US417319 A US 417319A US 41731973 A US41731973 A US 41731973A US 3867909 A US3867909 A US 3867909A
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US
United States
Prior art keywords
openings
walls
air
burner means
wall
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.)
Expired - Lifetime
Application number
US417319A
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English (en)
Inventor
John A Brown
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.)
Foster Wheeler Inc
Original Assignee
Foster Wheeler 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
Application filed by Foster Wheeler Inc filed Critical Foster Wheeler Inc
Priority to US417319A priority Critical patent/US3867909A/en
Priority to CA207,496A priority patent/CA1016415A/en
Priority to GB3766674A priority patent/GB1466579A/en
Priority to AU73598/74A priority patent/AU489455B2/en
Priority to JP49110930A priority patent/JPS5230641B2/ja
Priority to AR255822A priority patent/AR203492A1/es
Priority to IT28327/74A priority patent/IT1022799B/it
Priority to ES431386A priority patent/ES431386A1/es
Priority to BR9589/74A priority patent/BR7409589A/pt
Application granted granted Critical
Publication of US3867909A publication Critical patent/US3867909A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B19/00—Water-tube boilers of combined horizontally-inclined type and vertical type, i.e. water-tube boilers of horizontally-inclined type having auxiliary water-tube sets in vertical or substantially-vertical arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
    • F22B21/34—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
    • F22B21/341—Vertical radiation boilers with combustion in the lower part
    • F22B21/343—Vertical radiation boilers with combustion in the lower part the vertical radiation combustion chamber being connected at its upper part to a sidewards convection chamber

Definitions

  • ABSTRACT An apparatus for reducing slag deposits in the furnace section of a vapor generator in which a plurality of openings are formed in at least one of the walls adja cent a wall through which the furnace burners discharge. Air is continuously passed through the openings and across the heat absorption surface of the latter wall to maintain an oxidizing atmosphere and reduce the build-up of slag deposits on-the wall.
  • This invention relates to a furnace structure and, more particularly, to a furnace structure having walls formed by a plurality of finned tubes for passing water in a heat exchange relation with the heat generated in the furnace.
  • a plurality of burners are usually associated with one or more walls of the furnace, with fuel being introduced through the burners and being combusted in the furnace to raise the temperature in the furnace to predetermined values.
  • slag logs which are formed by small pieces of slag removed by soot blowers or by gradual build-up of drips, form in the corners between the sloping walls and the vertical sidewalls and can either slide down the sloping walls and bridge the throat or build up to unacceptable levels.
  • an object of the present invention to provide a furnace structure in which the build-up of slag along the heat absorption surface of the furnace generator is reduced.
  • FIG. 1 is a schematic sectional view of a vapor generator incorporating features of the present invention
  • FIGS. 2 and 3 are cross-sectional views taken along the lines 2-2 and 33, respectively, of FIG. 1;
  • FIG. 4 is an enlarged cross-sectional viewtaken along the line 4--4 of FIG. 1.
  • a furnace section shown in general by the reference numeral 30, is formed in the lower portion of the vapor generator 10 with the finned tube wall sections 12b, 14b, 16b and 18b defining heat albsorption surfaces in the interior of the furnace section.
  • the lower portion of the furnace section 30 has a hopper section 32 which is formed by inwardly sloped lower portions of the walls 12 and 14 and which terminates in a throat section 34 for gravity expulsion of ash particles formed during the combustion process.
  • a windbox 36 extends around the upper portion of the furnace section 30 and supports three opposing rows of burners 38 which operate in a conventional manner to burn coal introduced thereto by a conveying means not shownand which discharge through openings 40 formed in the walls 12 and 14, respectively.
  • a duct 42 supplies air to the windbox 36 which air is circulated through the openings 40 to aid in the combustion process, in a conventional manner.
  • the combustion gases formed in the furnace section 30 pass upwardly through a vertical gas pass 44 to a horizontal gas pass 46.
  • a conventional downward vertical gas pass registers with the horizontal gas pass 46 for passing the gases to a stack, or the like.
  • a plurality of slots 50 are provided through two portions of each of the walls 16 and 18.
  • the slots are formed through consecutive finned portions of the finned tube sections 16b and 18b and extend vertically, with their lower end portions being substantially coplaner with a portion of the sloping wall portions 12 and 14.
  • a pair of seal boxes 52 and Marc mounted on the sidewall 16 and a pair of seal boxes 56 and 58 are mounted on the sidewall 18.
  • the seal boxes 52, 54, 56 and 58 are welded,or otherwise directly fastened, to the outer surfaces of the finned tube sections 16b and 186 so that the boxes cover the slots 50.
  • a plurality of ducts 60 connect the windbox 36 to the seal boxes 52, 54, 56 and 58 in order to supply air from the windbox to the slots 50 whereby the air is discharged in two directions directly across the sloping portions of the walls 12 and 14 as shown by the arrows in FIG. 3 in connection with the wall 14.
  • the spacing between the slots 50 can be varied from that shown in the drawings.
  • the design may be such that the windbox 36 extends over and encloses the slots 50, in which case the seal boxes 52, 54, 56 and 58, as well as the ducts 60, can be eliminated.
  • a furnace structure comprising at least four walls interconnected to form an enclosure, at least a portion of said walls defining an internal heat absorption surface, burner means associated with at least one of said walls for burning a fossil fuel within said enclosure and adjacent said heat absorption surface, said wall associated with said burner means having a vertical portion and a sloped portion, a plurality of openings extending through at least one of the walls connected to said wall associated with said burner means, and means for supplying air to said openings, said openings being located relative to said wall associated with said burner means so that said air passes substantially perpendicular to said vertical portion of said wall and across said sloped portion and across the junction between said vertical portion and said sloped portion to continuously maintain an oxidizing atmosphere at the heat absorption surface defined by said portions.
  • openings are in the form of a plurality of spaced slots aligned with said sloped portion and extending to said junction.
  • said means for supplying air comprises a windbox extending around a portion of said enclosure to supply air to said burner means, and duct means connecting said windbox to said openings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Supply (AREA)
  • Gasification And Melting Of Waste (AREA)
US417319A 1973-11-19 1973-11-19 Slag prevention air slots in furnace sidewalls Expired - Lifetime US3867909A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US417319A US3867909A (en) 1973-11-19 1973-11-19 Slag prevention air slots in furnace sidewalls
CA207,496A CA1016415A (en) 1973-11-19 1974-08-21 Slag prevention air slots in furnace sidewalls
GB3766674A GB1466579A (en) 1973-11-19 1974-08-28 Furnace structures
AU73598/74A AU489455B2 (en) 1973-11-19 1974-09-23 Slag prevention air slots in furnace sidewalls
JP49110930A JPS5230641B2 (enrdf_load_stackoverflow) 1973-11-19 1974-09-26
AR255822A AR203492A1 (es) 1973-11-19 1974-09-30 Estructura de horno
IT28327/74A IT1022799B (it) 1973-11-19 1974-10-11 Forno per generatori di vapope
ES431386A ES431386A1 (es) 1973-11-19 1974-10-25 Perfeccionamientos relativos a estructuras de hornos.
BR9589/74A BR7409589A (pt) 1973-11-19 1974-11-14 Estrutura de forno

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US417319A US3867909A (en) 1973-11-19 1973-11-19 Slag prevention air slots in furnace sidewalls

Publications (1)

Publication Number Publication Date
US3867909A true US3867909A (en) 1975-02-25

Family

ID=23653477

Family Applications (1)

Application Number Title Priority Date Filing Date
US417319A Expired - Lifetime US3867909A (en) 1973-11-19 1973-11-19 Slag prevention air slots in furnace sidewalls

Country Status (8)

Country Link
US (1) US3867909A (enrdf_load_stackoverflow)
JP (1) JPS5230641B2 (enrdf_load_stackoverflow)
AR (1) AR203492A1 (enrdf_load_stackoverflow)
BR (1) BR7409589A (enrdf_load_stackoverflow)
CA (1) CA1016415A (enrdf_load_stackoverflow)
ES (1) ES431386A1 (enrdf_load_stackoverflow)
GB (1) GB1466579A (enrdf_load_stackoverflow)
IT (1) IT1022799B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4257357A (en) * 1978-01-16 1981-03-24 Foster Wheeler Energy Corporation Furnaces
CN101699166B (zh) * 2009-11-16 2011-03-23 上海交通大学 四角切圆燃煤锅炉的炉底风喷口组
CN102620309A (zh) * 2012-04-10 2012-08-01 无锡华光锅炉股份有限公司 锅炉的底部风布置结构
CN102705818A (zh) * 2012-06-22 2012-10-03 上海锅炉厂有限公司 一种锅炉燃烧器贴壁风布置方式

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54142934U (enrdf_load_stackoverflow) * 1978-03-22 1979-10-04
JPS5540118U (enrdf_load_stackoverflow) * 1978-09-07 1980-03-14
US5305698A (en) * 1989-04-04 1994-04-26 Blackwell Brian R Method and apparatus for improving fluid flow and gas mixing in boilers
RU2253799C1 (ru) * 2004-06-28 2005-06-10 Григорьев Константин Анатольевич Вихревая топка
RU2253800C1 (ru) * 2004-07-02 2005-06-10 Григорьев Константин Анатольевич Вихревая топка
RU2253801C1 (ru) * 2004-07-12 2005-06-10 Григорьев Константин Анатольевич Вихревая топка

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1617694A (en) * 1924-03-11 1927-02-15 Int Comb Eng Corp Art of combustion
US2294242A (en) * 1939-04-14 1942-08-25 Josiah H Rohrer Steam generating furnace
US2695599A (en) * 1953-07-14 1954-11-30 Combustion Eng Superheat temperature control by overfire air
US3048131A (en) * 1959-06-18 1962-08-07 Babcock & Wilcox Co Method for burning fuel
US3269366A (en) * 1964-10-20 1966-08-30 Combustion Eng Vapor generator furnace wall deslagger
US3662719A (en) * 1970-10-09 1972-05-16 Foster Wheeler Corp Apparatus and process for slag reduction in a vapor generator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1617694A (en) * 1924-03-11 1927-02-15 Int Comb Eng Corp Art of combustion
US2294242A (en) * 1939-04-14 1942-08-25 Josiah H Rohrer Steam generating furnace
US2695599A (en) * 1953-07-14 1954-11-30 Combustion Eng Superheat temperature control by overfire air
US3048131A (en) * 1959-06-18 1962-08-07 Babcock & Wilcox Co Method for burning fuel
US3269366A (en) * 1964-10-20 1966-08-30 Combustion Eng Vapor generator furnace wall deslagger
US3662719A (en) * 1970-10-09 1972-05-16 Foster Wheeler Corp Apparatus and process for slag reduction in a vapor generator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4257357A (en) * 1978-01-16 1981-03-24 Foster Wheeler Energy Corporation Furnaces
CN101699166B (zh) * 2009-11-16 2011-03-23 上海交通大学 四角切圆燃煤锅炉的炉底风喷口组
CN102620309A (zh) * 2012-04-10 2012-08-01 无锡华光锅炉股份有限公司 锅炉的底部风布置结构
CN102705818A (zh) * 2012-06-22 2012-10-03 上海锅炉厂有限公司 一种锅炉燃烧器贴壁风布置方式

Also Published As

Publication number Publication date
ES431386A1 (es) 1976-11-01
IT1022799B (it) 1978-04-20
BR7409589A (pt) 1976-05-25
GB1466579A (en) 1977-03-09
JPS5230641B2 (enrdf_load_stackoverflow) 1977-08-09
AR203492A1 (es) 1975-09-15
AU7359874A (en) 1976-03-25
CA1016415A (en) 1977-08-30
JPS5083602A (enrdf_load_stackoverflow) 1975-07-07

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