US3834327A - Cyclone furnace having ash removal means - Google Patents

Cyclone furnace having ash removal means Download PDF

Info

Publication number
US3834327A
US3834327A US00352304A US35230473A US3834327A US 3834327 A US3834327 A US 3834327A US 00352304 A US00352304 A US 00352304A US 35230473 A US35230473 A US 35230473A US 3834327 A US3834327 A US 3834327A
Authority
US
United States
Prior art keywords
cyclone furnace
grate
passage
fuel
conduit
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
US00352304A
Other languages
English (en)
Inventor
B Hellstrom
U Karsberg
I Astrom
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.)
Goetaverken Angteknik AB
Original Assignee
Goetaverken Angteknik AB
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 Goetaverken Angteknik AB filed Critical Goetaverken Angteknik AB
Application granted granted Critical
Publication of US3834327A publication Critical patent/US3834327A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/32—Incineration of waste; Incinerator constructions; Details, accessories or control therefor the waste being subjected to a whirling movement, e.g. cyclonic incinerators
    • 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
    • F22B21/02—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from substantially-straight water tubes
    • F22B21/04—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from substantially-straight water tubes involving a single upper drum and a single lower drum, e.g. the drums being arranged transversely
    • 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
    • F23G7/10—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of field or garden waste or biomasses
    • F23G7/105—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of field or garden waste or biomasses of wood waste

Definitions

  • the cyclone furnace has a cylindrical combustion For the combustion of wood refuse such as bark 5 Chamber a vertical axis and IS provided a chips and the like, a cyclone furnace is often used.
  • a furnace comprises a cylindrical, vertical combustion chamber, which, in its lower part is provided with a grate and usually also a mechanical stoking device feeding the fuel to the central portion thereof, in such a manner that the fuel will form a substantially conical mound thereon.
  • Other ways of feeding the fuel include a chute for feeding the fuel onto the grate in a downward direction.
  • the combustion chamber is provided with a number of tangentially directed air nozzles, which impart a forceful whirling motion upon the combustion gases.
  • the diameter of the grate is selected in such a manner with respect to the desired combustion capacity and to the angle of repose of the fuel to be used that an annular passage, free of fuel will be formed around the mound of fuel.
  • the grate is, within this annular passage, usually provided with openings forming a connection with ash collecting pockets located below the grate.
  • Bark contains a rather substantial amount of mineral components, and wood refuse is often contaminated with sand which has been entrained when the logs are dragged along the ground. Such incombustible matter will fuse when subjected to elevated temperature, and it very often happens that particles of fuel still un-burnt falling into the annular passage will be intermingled with and fused together with the mineral particles, which leads to a clogging of the ash removal openings in the grate.
  • One object of the present invention is to provide a continuous collection of such particles as are circulated along this annular passage by the rotating gases and to remove them from the mound of fuel.
  • the invention is characterized in an exit passage open towards the annular passage and directed tangentially with respect to the wall of the combustion chamber, in an ejector connected to said passage, and in a conduit connecting the ejector with a conduit conveying air under pressure in such a manner that a continuous ejection is obtained in the exit passage.
  • An outlet conduit from the ejector may be connected to the upper part of the combustion chamber, or alternatively to a combustion plant located downstream of the cyclone furnace.
  • FIG. 1 is a vertical section through a cyclone furnace suitable for the combustion of bark and connected to a steam boiler,
  • FIG. 2 shows part of a section along line II II in FIG. 1, the view looking in the direction of the arrows, and
  • FIG. 3 is a view partly in elevation and partly in cross section showing a cyclone furnace fitted to a steam boiler.
  • grate l 1 in its lower portion.
  • the fuel which on this occasion consists of bark and similar wood refuse, is fed centrally onto this grate by means of a stoking apparatus 12, the details of which are not shown on the draw- 0 ing, in such a manner that a substantially conical mound 13 will be formed upon the grate.
  • the diameter of the grate and of the furnace chamber is selected in such a manner with respect to the desired combustion capacity and the angle of repose of the fuel to be used that, during use, an annular passage 14, free of fuel, will be formed around the mound of burning fuel.
  • nozzles 16 for the injection of secondary air are provided. These nozzles are directed tangentially with respect to an imaginary cylinder concentric with the axis of rotation and are supplied with preheated air from a duct 17 connected to a fan (not shown).
  • combustion chamber is connected to a furnace 18 of a steam boiler, which is indicated above the cyclone furnace.
  • the air issuing from the secondary air nozzles 16 induce a forceful whirling motion within the chamber.
  • a great many particles of un-burnt matter are carried by this vortex and will be finally combusted carried by the gases.
  • a number of heavier particles will, .however, slide down along the wall of the combustion chamber, ending up in the annular passage, where they, while still burning, may be baked together with ash particles sliding down along the slope of the mound of fuel and will form a sintered slag clogging the air entrance opening in the outer portion of the grate, as well as possible ash removal openings in the annular passage.
  • An exit passage 19 is provided in the wall of the combustion chamber, just above the grate and is directed towards the rotating gas-swirl. All larger particles will be collected in this passage.
  • the passage is connected to an ejector 20, which, by way of a first conduit 21, is connected to the duct 17 supplying secondary combustion air.
  • the particles collected will, in this manner, by way of a second conduit 22, be transported from the ejector to the furnace of the steam boiler, downstream of the cyclone furnace, in which they will be finally burnt.
  • the resulting ash has the consistency of light cinder, and will facilitate the cleaning of the heating surfaces of the steam boiler while passing through the latter.
  • conduit 22 to the upper part of the combustion chamber to the cyclone furnace, above the level of the secondary air nozzles 16.
  • the final combustion of the collected particles will then start in the cyclone furnace, but will be finalized in the second furnace, with the particles following the gas stream passing through the throat connecting the two furnaces.
  • An inspection and cleaning opening having a cover 15 is provided at the ejector 20 in such a manner that the latter, as well as the exit passage may be cleaned,
  • FIG. 3 shows the cyclone furnace l fitted to a steam boiler, the combustion chamber 18 of which is provided with oil burners 30 or other fuel combustion means operable independently of the cyclone furnace.
  • the combustion gases leaving the steam boiler will pass through a dust separator 31 connected to the smoke stack.
  • Conduit 22 from the ejector at the cyclone furnace is connected to the dust separator at 32, and will pass through a feed water heater 33 or some similar heat exchanger for cooling of the mixture of air and ash particles.
  • a cyclone furnace having a vertical axis, a combustion chamber provided with upper and lower portions, a grate in the lower portion of the combustion chamber, means for feeding solid fuel onto the grate to form, in use, a conical mound of burning matter thereon, said grate having such an extension in relation to the desired combustion capacity and to the angle of response of the fuel utilized that an annular passage, free of fuel is formed around the mound, a number of nozzles in the upper portion of the combustion chamber for the introduction of secondary air tangentially with respect to an imaginary cylinder concentric with the longitudinal axis of the chamber, and an axial outlet for the combustion gases, a gas passage to which said axial outlet leads, the improvement including an exit passage in a side wall of the cyclone furnace located level with an open towards the annular passage and directed tangentially away therefrom, an ejector means fitted into said exit passage, the ejector means having an outlet end, a first passage connecting said ejector means with a source of pressure fluid,
  • the cyclone furnace according to claim 3 including a device for cooling of the mixture of gases and solid matter therein through which the second conduit passes before entering the dust collector.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Solid-Fuel Combustion (AREA)
  • Incineration Of Waste (AREA)
US00352304A 1972-06-14 1973-04-18 Cyclone furnace having ash removal means Expired - Lifetime US3834327A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE07803/72A SE362947B (enrdf_load_stackoverflow) 1972-06-14 1972-06-14

Publications (1)

Publication Number Publication Date
US3834327A true US3834327A (en) 1974-09-10

Family

ID=20272359

Family Applications (1)

Application Number Title Priority Date Filing Date
US00352304A Expired - Lifetime US3834327A (en) 1972-06-14 1973-04-18 Cyclone furnace having ash removal means

Country Status (6)

Country Link
US (1) US3834327A (enrdf_load_stackoverflow)
JP (1) JPS49108643A (enrdf_load_stackoverflow)
BR (1) BR7304462D0 (enrdf_load_stackoverflow)
CA (1) CA975616A (enrdf_load_stackoverflow)
FI (1) FI54192C (enrdf_load_stackoverflow)
SE (1) SE362947B (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177740A (en) * 1978-03-10 1979-12-11 Enterprises International, Inc. Apparatus for generating heat from waste fuel
FR2451000A1 (fr) * 1979-03-05 1980-10-03 Janot Francois Incinerateur de dechets
US4300460A (en) * 1978-03-10 1981-11-17 Enterprises International Inc. Method for generating heat from waste fuel
FR2496232A1 (fr) * 1980-08-27 1982-06-18 Satake Eng Co Ltd Four de combustion d'enveloppes vegetales
US4389979A (en) * 1979-09-03 1983-06-28 Oddmund Saxlund Method and apparatus for the operation of a boiler installation with stoker firing
EP0092622A1 (en) * 1982-04-20 1983-11-02 YORK-SHIPLEY, Inc. Fast fluidized bed reactor and method of operating the reactor
US4422388A (en) * 1981-12-01 1983-12-27 Raskin Jean F Wood and other solid register burner
US4469050A (en) * 1981-12-17 1984-09-04 York-Shipley, Inc. Fast fluidized bed reactor and method of operating the reactor
US4538529A (en) * 1980-10-15 1985-09-03 Vereinigte Kesselwerke Ag Garbage incinerator
US4903616A (en) * 1986-05-12 1990-02-27 Konstantin Mavroudis Device for supply of secondary air, and boiler with the device
US4928606A (en) * 1988-01-13 1990-05-29 Air Products And Chemicals, Inc. Combustion of low B.T.U./high moisture content fuels
US20090126607A1 (en) * 2007-11-16 2009-05-21 Hong Jin Kim Combustion Apparatus For Recovering Heat
WO2016025857A1 (en) * 2014-08-15 2016-02-18 Higgins Daniel R Power boiler having vertically mounted cylindrical combustion chamber
US20210190311A1 (en) * 2015-02-27 2021-06-24 Morgan State University System and method for biomass combustion

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2627827A (en) * 1948-12-10 1953-02-10 Elliott Lacester Fly-ash handling apparatus
US2769411A (en) * 1951-11-06 1956-11-06 Rosenblad Corp Fuel combustion process and apparatus
US2917011A (en) * 1956-05-10 1959-12-15 Kohlenscheidungs Gmbh Apparatus and method for melting fly ash in a tangentially fired furnace chamber
US3022753A (en) * 1955-01-11 1962-02-27 Jacksonville Blow Pipe Company Incinerator
US3289620A (en) * 1963-10-23 1966-12-06 Goetaverken Ab Combustion furnaces

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2627827A (en) * 1948-12-10 1953-02-10 Elliott Lacester Fly-ash handling apparatus
US2769411A (en) * 1951-11-06 1956-11-06 Rosenblad Corp Fuel combustion process and apparatus
US3022753A (en) * 1955-01-11 1962-02-27 Jacksonville Blow Pipe Company Incinerator
US2917011A (en) * 1956-05-10 1959-12-15 Kohlenscheidungs Gmbh Apparatus and method for melting fly ash in a tangentially fired furnace chamber
US3289620A (en) * 1963-10-23 1966-12-06 Goetaverken Ab Combustion furnaces

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177740A (en) * 1978-03-10 1979-12-11 Enterprises International, Inc. Apparatus for generating heat from waste fuel
US4300460A (en) * 1978-03-10 1981-11-17 Enterprises International Inc. Method for generating heat from waste fuel
FR2451000A1 (fr) * 1979-03-05 1980-10-03 Janot Francois Incinerateur de dechets
US4389979A (en) * 1979-09-03 1983-06-28 Oddmund Saxlund Method and apparatus for the operation of a boiler installation with stoker firing
FR2496232A1 (fr) * 1980-08-27 1982-06-18 Satake Eng Co Ltd Four de combustion d'enveloppes vegetales
US4538529A (en) * 1980-10-15 1985-09-03 Vereinigte Kesselwerke Ag Garbage incinerator
US4422388A (en) * 1981-12-01 1983-12-27 Raskin Jean F Wood and other solid register burner
US4469050A (en) * 1981-12-17 1984-09-04 York-Shipley, Inc. Fast fluidized bed reactor and method of operating the reactor
US4457289A (en) * 1982-04-20 1984-07-03 York-Shipley, Inc. Fast fluidized bed reactor and method of operating the reactor
EP0092622A1 (en) * 1982-04-20 1983-11-02 YORK-SHIPLEY, Inc. Fast fluidized bed reactor and method of operating the reactor
US4903616A (en) * 1986-05-12 1990-02-27 Konstantin Mavroudis Device for supply of secondary air, and boiler with the device
US4928606A (en) * 1988-01-13 1990-05-29 Air Products And Chemicals, Inc. Combustion of low B.T.U./high moisture content fuels
US20090126607A1 (en) * 2007-11-16 2009-05-21 Hong Jin Kim Combustion Apparatus For Recovering Heat
WO2016025857A1 (en) * 2014-08-15 2016-02-18 Higgins Daniel R Power boiler having vertically mounted cylindrical combustion chamber
US9581326B2 (en) * 2014-08-15 2017-02-28 Daniel R. Higgins Power boiler having vertically mounted cylindrical combustion chamber
US10215398B2 (en) 2014-08-15 2019-02-26 Daniel R Higgins Solid fuel burning-furnace having a vertically mounted cylindrical combustion chamber
US11015800B2 (en) * 2014-08-15 2021-05-25 Sullivan, Higgins & Brion PPE LLC Solid fuel burning-furnace having a vertically mounted cylindrical combustion chamber
US20210190311A1 (en) * 2015-02-27 2021-06-24 Morgan State University System and method for biomass combustion
US11982442B2 (en) * 2015-02-27 2024-05-14 Morgan State University System and method for biomass combustion

Also Published As

Publication number Publication date
FI54192B (fi) 1978-06-30
FI54192C (fi) 1978-10-10
JPS49108643A (enrdf_load_stackoverflow) 1974-10-16
CA975616A (en) 1975-10-07
BR7304462D0 (pt) 1974-09-05
SE362947B (enrdf_load_stackoverflow) 1973-12-27

Similar Documents

Publication Publication Date Title
US3834327A (en) Cyclone furnace having ash removal means
US2917011A (en) Apparatus and method for melting fly ash in a tangentially fired furnace chamber
US4159000A (en) Method for sootless combustion and furnace for said combustion
CA2389660C (en) Method and apparatus for combustion of residual carbon in fly ash
US4253409A (en) Coal burning arrangement
US4512736A (en) Apparatus for the expansion of mineral matter, especially perlite and vermiculite
US3955512A (en) Refuse incinerator
US4532872A (en) Char reinjection system for bark fired furnace
US4177740A (en) Apparatus for generating heat from waste fuel
AU593965B2 (en) Boosted coal-fired steam generator
JP2005300022A (ja) 固形燃料の燃焼装置
US5272866A (en) Method and apparatus for treating gases from gasification or combustion plants
US4300460A (en) Method for generating heat from waste fuel
US4840130A (en) Waste disposal system
CS198243B2 (en) Method of and apparatus for combusting wet waste fuel,especially of vegetal origin
US4286527A (en) System for ash removal
US4301747A (en) High temperature furnace with improved slag tap
US2891493A (en) Method of and apparatus for burning particle-form fuel
US2833230A (en) Pulverized coal firing system
US4279206A (en) Coal burning system
US3875875A (en) Cyclone furnace
US2856872A (en) Pulverized coal firing system
GB2034868A (en) Boiler combustion chamber
US3888632A (en) Combustion chamber
JPS5893785A (ja) 熱分解ガスの製造方法及びこの方法を実施する装置