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EP0175407A1 - Apparatus for metering and blowing a combustible material into a furnace - Google Patents

Apparatus for metering and blowing a combustible material into a furnace Download PDF

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Publication number
EP0175407A1
EP0175407A1 EP85201365A EP85201365A EP0175407A1 EP 0175407 A1 EP0175407 A1 EP 0175407A1 EP 85201365 A EP85201365 A EP 85201365A EP 85201365 A EP85201365 A EP 85201365A EP 0175407 A1 EP0175407 A1 EP 0175407A1
Authority
EP
European Patent Office
Prior art keywords
furnace
combustible material
blowing
volume
metering device
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.)
Granted
Application number
EP85201365A
Other languages
German (de)
French (fr)
Other versions
EP0175407B1 (en
Inventor
Johannus Theodorus Willibrordus Windt
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.)
ESDEX V.O.F. TE AMSTERDAM.
Original Assignee
Esmil BV
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 Esmil BV filed Critical Esmil BV
Priority to AT85201365T priority Critical patent/ATE34037T1/en
Publication of EP0175407A1 publication Critical patent/EP0175407A1/en
Application granted granted Critical
Publication of EP0175407B1 publication Critical patent/EP0175407B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
    • 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
    • F23G5/44—Details; Accessories
    • F23G5/442—Waste feed arrangements
    • F23G5/444—Waste feed arrangements for solid waste

Definitions

  • the invention relates to apparatus for metering and blowing a combustible material into a furnace, e.g. a cement kiln.
  • a combustible material may be a material reclaimed from domestic refuse (RDF) for example a loose non-compressed combustible material reclaimed from domestic refuse, mainly comprising paper and plastics, known as "fluff".
  • RDF domestic refuse
  • fluff loose non-compressed combustible material reclaimed from domestic refuse
  • RDF reuse derived fuel
  • the combustible material is compressed to a granular material of a relatively high density.
  • Fluff is loose material, mainly comprising paper and plastics with a maximum size, e.g. 200 mm, determined by a grinding process preceding the reclamation thereof.
  • Fluff has a low density and forms a resilient mass which can be compressed to bales.
  • US-A-2 011 133 One possible method of feeding combustible material, in this case pulverized coal, into a furnace is illustrated in US-A-2 011 133 where the coal is metered from a hopper by a rotating compartment feeder opening below into a venturi which is energized by a fan and connects directly into a pneumatic conveying line leading to the furnace.
  • the hopper includes agitators to ensure that the compartments of the feeder are filled.
  • FR-A-2 500 122 shows in Fig. 1 an inclined conveyor which lifts combustible material in the form of lumps, e.g wood, maize cobs, straw balls, into a chute down which they feed by gravity into a furnace.
  • the conveyor has projecting bars to catch the material.
  • a rotating compartment valve may be provided in the chute.
  • the object of the invention is to provide apparatus for metering and blowing combustible material into a furnace, which can handle a variety of materials, especially but not exclusively the fluff described above.
  • the invention is set out in claim 1.
  • the volume metering device for the combustible material comprises an upwardly inclined belt conveyor carrying compartments for the removal of the combustible material from a storage container, e.g. bin or bunker.
  • the compartments are formed by catch plates at right angles to the belt direction and the belt runs at an angle a in the range 30° to 80° to the horizontal.
  • pellets can be metered by this preferred embodiment, it is especially suitable for volume metering of combustible material in the form of fluff.
  • the quantity of fluff which is metered is to a large extent dependent on the instantaneous properties of the fluff such as its density and compressibility.
  • the combustion value of RDF is, as a rule, not constant but varies depending on the kind of RDF, and also on its origin, the season of the year etc.
  • the speed of the belt conveyor is adjustable, so that the supply rate of RDF to the furnace can be controlled.
  • the capacity of the rotating compartment valve is considerably larger than the capacity of the volume metering device. As a consequence, clogging is prevented.
  • the venturi has its axis located at right angles to the axis of rotation of the rotating compartment valve. This improves the regularity of supply of RDF to the furnace.
  • the invention provides advantages in particular in the metering and blowing of fluff into a cement kiln, but is not limited thereto, and an apparatus of the invention can be capable of handling a variety of materials.
  • the invention can just as well be applied to the alternating burning of fluff and RDF pellets in a cement kiln, or to the burning of RDF pellets only, or to the burning of another combustible material such as peat or lignite.
  • the invention can also be applied to the burning of a combustible material in a different kind of furnace, for instance a travelling grate furnace or a fluidized bed furnace.
  • the supply of the combustible material is indicated, for the specific case in which fluff compressed in bales is processed.
  • the bales move on a supply roller conveyor 15 and are subsequently lifted by means of an inclined belt 2 from which they pass into a mill 3 via a hopper 16. If there is only a short distance between a refuse separation apparatus and the furnace, the fluff reclaimed from domestic refuse can alternatively be supplied in bulk.
  • the loose material obtained from the mill 3 is collected in a storage bin or bunker 4 and removed therefrom with a volume metering device 5 which comprises an upwardly inclined plate belt 6, on which compartments 7 are mounted.
  • the compartments are formed by catch plates 8 arranged at right angles to the plate belt and thus to the direction of movement of the upward run of the plate belt, which is an angle a in the range 30° to 80° to the horizontal.
  • the quantity of combustible material removed from the bin 4 by each compartment and thus the rate of removal corresponds to the size of the compartments and the angle of repose of the combustible material.
  • the material removed from the bin 4 by the volume metering device 5 is discharged into a hopper 9, from which a'rotating compartment valve or rotor lock 10 is fed.
  • the volume metering device has a casing 18 connected to the hopper 9.
  • the venturi 11 is energized by a fan 12.
  • This pipeline 14 runs to the furnace 17, which is indicated schematically. In this way, pneumatic transport and blowing into the furnace 17 of the combustible material take place.
  • the speed -v of the plate belt 6 and the size of the compartments 7 which together determine the capacity of the volume metering device 5 and the rotating speed of the rotor lock 10 and the size of the compartments 13 are chosen so that the capacity of the rotor lock 10 is, at all times, considerably larger than the capacity of the volume metering device 5. As a consequence, clogging is prevented.
  • the speed of the plate belt 6 is adjustable by a control, so that the rate of supply of combustible material to the furnace can be controlled.
  • the axis of the venturi 11 is arranged at right angles to the axis of rotation of the rotor lock 10, so that a regular supply of combustible material to the furnace is obtained. Also, the rotor lock 10 discharges vertically above the venturi 11, which promotes the falling of combustible material into the air flow.

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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)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

Apparatus for metering and blowing combustible material into a furnace, a rotating compartment valve (10) for the material which opens downwardly into a venturi (11) which is energized by a fan (12) and is connected to a conduit (14) for transport of the material to the furnace and blowing it into the furnace. To make the apparatus capable of handling a wide range of materials, including fluff (sheet material from domestic refuse) there is provided a volume-metering device (5) which supplies the material to the rotating compartment valve (10). Preferably the volume flow capacity of the rotating compartment valve (10) is substantially greater than that of the volume-metering device (5).

Description

  • The invention relates to apparatus for metering and blowing a combustible material into a furnace, e.g. a cement kiln. Particularly but not exclusively the combustible material may be a material reclaimed from domestic refuse (RDF) for example a loose non-compressed combustible material reclaimed from domestic refuse, mainly comprising paper and plastics, known as "fluff".
  • According to its type and composition, several kinds of RDF (refuse derived fuel) are known. In the case of pellets, the combustible material is compressed to a granular material of a relatively high density. Fluff is loose material, mainly comprising paper and plastics with a maximum size, e.g. 200 mm, determined by a grinding process preceding the reclamation thereof. Fluff has a low density and forms a resilient mass which can be compressed to bales.
  • It has already been suggested to burn RDF in a furnace. In the case of a cement kiln, the ashes of the RDF can be incorporated in the cement without reducing the quality thereof. Fuel is saved by burning RDF.
  • One possible method of feeding combustible material, in this case pulverized coal, into a furnace is illustrated in US-A-2 011 133 where the coal is metered from a hopper by a rotating compartment feeder opening below into a venturi which is energized by a fan and connects directly into a pneumatic conveying line leading to the furnace. The hopper includes agitators to ensure that the compartments of the feeder are filled.
  • FR-A-2 500 122 shows in Fig. 1 an inclined conveyor which lifts combustible material in the form of lumps, e.g wood, maize cobs, straw balls, into a chute down which they feed by gravity into a furnace. The conveyor has projecting bars to catch the material. To meter the material into the furnace, a rotating compartment valve may be provided in the chute.
  • The object of the invention is to provide apparatus for metering and blowing combustible material into a furnace, which can handle a variety of materials, especially but not exclusively the fluff described above.
  • The invention is set out in claim 1.
  • With the apparatus according to the invention, a regular supply of the RDF or other material to the furnace takes place. The risk of clogging of the apparatus is avoided or minimized.
  • Preferably, the volume metering device for the combustible material comprises an upwardly inclined belt conveyor carrying compartments for the removal of the combustible material from a storage container, e.g. bin or bunker. Preferably, in that case, the compartments are formed by catch plates at right angles to the belt direction and the belt runs at an angle a in the range 30° to 80° to the horizontal. Although pellets can be metered by this preferred embodiment, it is especially suitable for volume metering of combustible material in the form of fluff. When metering apparatuses already known are used, such as for instance a horizontal conveyor belt and a wiping device, like a doctor blade, by which the level of the combustible material on the conveyor belt is controlled, the quantity of fluff which is metered is to a large extent dependent on the instantaneous properties of the fluff such as its density and compressibility.
  • The combustion value of RDF is, as a rule, not constant but varies depending on the kind of RDF, and also on its origin, the season of the year etc. Preferably, therefore, the speed of the belt conveyor is adjustable, so that the supply rate of RDF to the furnace can be controlled.
  • Preferably, the capacity of the rotating compartment valve is considerably larger than the capacity of the volume metering device. As a consequence, clogging is prevented.
  • For good design of the apparatus, the venturi has its axis located at right angles to the axis of rotation of the rotating compartment valve. This improves the regularity of supply of RDF to the furnace.
  • The invention provides advantages in particular in the metering and blowing of fluff into a cement kiln, but is not limited thereto, and an apparatus of the invention can be capable of handling a variety of materials. For instance, the invention can just as well be applied to the alternating burning of fluff and RDF pellets in a cement kiln, or to the burning of RDF pellets only, or to the burning of another combustible material such as peat or lignite. The invention can also be applied to the burning of a combustible material in a different kind of furnace, for instance a travelling grate furnace or a fluidized bed furnace.
  • An embodiment of the invention will be described below by way of example with reference to the accompanying drawing in which Figure 1 shows schematically a side view of the apparatus embodying the invention.
  • On the right-hand side in Figure 1, the supply of the combustible material is indicated, for the specific case in which fluff compressed in bales is processed. The bales move on a supply roller conveyor 15 and are subsequently lifted by means of an inclined belt 2 from which they pass into a mill 3 via a hopper 16. If there is only a short distance between a refuse separation apparatus and the furnace, the fluff reclaimed from domestic refuse can alternatively be supplied in bulk.
  • The loose material obtained from the mill 3 is collected in a storage bin or bunker 4 and removed therefrom with a volume metering device 5 which comprises an upwardly inclined plate belt 6, on which compartments 7 are mounted. The compartments are formed by catch plates 8 arranged at right angles to the plate belt and thus to the direction of movement of the upward run of the plate belt, which is an angle a in the range 30° to 80° to the horizontal. The quantity of combustible material removed from the bin 4 by each compartment and thus the rate of removal, corresponds to the size of the compartments and the angle of repose of the combustible material.
  • The material removed from the bin 4 by the volume metering device 5 is discharged into a hopper 9, from which a'rotating compartment valve or rotor lock 10 is fed. The volume metering device has a casing 18 connected to the hopper 9. Below the rotor lock 10, there is a venturi 11 in open connection with the outlet side of the rotor lock 10. The venturi 11 is energized by a fan 12. Each time one of the compartments 13 of the rotor lock 10 comes in open communication with the venturi, the combustible material is carried with an air flow generated by the fan 12 into a pipeline 14 coupled to the venturi. This pipeline 14 runs to the furnace 17, which is indicated schematically. In this way, pneumatic transport and blowing into the furnace 17 of the combustible material take place.
  • The speed -v of the plate belt 6 and the size of the compartments 7 which together determine the capacity of the volume metering device 5 and the rotating speed of the rotor lock 10 and the size of the compartments 13 are chosen so that the capacity of the rotor lock 10 is, at all times, considerably larger than the capacity of the volume metering device 5. As a consequence, clogging is prevented.
  • The speed of the plate belt 6 is adjustable by a control, so that the rate of supply of combustible material to the furnace can be controlled.
  • The axis of the venturi 11 is arranged at right angles to the axis of rotation of the rotor lock 10, so that a regular supply of combustible material to the furnace is obtained. Also, the rotor lock 10 discharges vertically above the venturi 11, which promotes the falling of combustible material into the air flow.

Claims (6)

1. Apparatus for metering and blowing combustible material into a furnace, having a rotating compartment valve (10) for the material which opens downwardly into a venturi (11) which is energized by a fan (12) and is connected to a conduit (14) for transport of the material to the furnace and blowing it into the furnace characterized by
a volume-metering device (5) for the material which supplies the material to the rotating compartment valve (10).
2. Apparatus according to claim 1 wherein the volume-metering device is an inclined belt conveyor (6) carrying compartments (7) for the removal of the combustible material from a storage container (4) therefor.
3. Apparatus according to claim 2 wherein the compartments (7) are formed by catch plates (8) which extend at right angles to the direction of movement of the belt conveyor, and the belt conveyor (6), at least in its run which conveys the material out of the storage container (4), is inclined at an angle in the range 30° to 80° to the horizontal.
4. Apparatus according to claim 2 or claim 3 wherein the speed of the belt conveyor (6) is adjustable.
5. Apparatus according to any one of the preceding claims wherein the volume flow capacity of the rotating compartment valve (10) is arranged to be substantially greater than that of the volume-metering device (5).
6. Apparatus according to any one of the preceding claims wherein the axis of the venturi (11) is perpendicular to the rotation axis of the rotating compartment valve (10).
EP85201365A 1984-09-03 1985-08-30 Apparatus for metering and blowing a combustible material into a furnace Expired EP0175407B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85201365T ATE34037T1 (en) 1984-09-03 1985-08-30 DEVICE FOR DOSING AND INJECTING A FUEL INTO A FURNACE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8402675 1984-09-03
NL8402675A NL8402675A (en) 1984-09-03 1984-09-03 APPARATUS FOR DOSING AND INFLATING AN OVEN OF A FLAMMABLE MATERIAL.

Publications (2)

Publication Number Publication Date
EP0175407A1 true EP0175407A1 (en) 1986-03-26
EP0175407B1 EP0175407B1 (en) 1988-05-04

Family

ID=19844399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85201365A Expired EP0175407B1 (en) 1984-09-03 1985-08-30 Apparatus for metering and blowing a combustible material into a furnace

Country Status (4)

Country Link
EP (1) EP0175407B1 (en)
AT (1) ATE34037T1 (en)
DE (1) DE3562524D1 (en)
NL (1) NL8402675A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004083723A1 (en) * 2003-03-20 2004-09-30 Rolf Tews Method and device for feeding industrial combustion plants with wastes, in particular with secondary fuels
EP1469253A1 (en) * 2002-11-07 2004-10-20 Tokyo Elex Co., Ltd. Waste treatment method and treatment facility
EP2266897A1 (en) * 2008-03-24 2010-12-29 Kobelco Eco-solutions Co., Ltd. Waste conveyor and waste treating system with the same
CN102192524A (en) * 2011-03-24 2011-09-21 华新环境工程有限公司 System for comprehensively utilizing refuse derived fuel in cement kiln
JP2016125789A (en) * 2015-01-07 2016-07-11 株式会社神鋼環境ソリューション Waste supply device and operating method therefor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1422867A (en) * 1922-02-16 1922-07-18 Karycheff Vladimir Apparatus for feeding fuel to furnaces
US2011133A (en) * 1932-06-10 1935-08-13 Yoss Emanuel Pulverized fuel feeder
GB1067194A (en) * 1962-10-17 1967-05-03 Koppers Co Inc Improvements in or relating to rotary feeders
US3387574A (en) * 1966-11-14 1968-06-11 Combustion Eng System for pneumatically transporting high-moisture fuels such as bagasse and bark and an included furnace for drying and burning those fuels in suspension under high turbulence
FR2500122A1 (en) * 1981-02-17 1982-08-20 Heron Pierre Measured solid fuel feed for boiler - has conveyors supplying feed chute to boiler with feed control inlet door
US4377117A (en) * 1979-12-21 1983-03-22 Kolze Bruce A Particulate waste wood firing system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1422867A (en) * 1922-02-16 1922-07-18 Karycheff Vladimir Apparatus for feeding fuel to furnaces
US2011133A (en) * 1932-06-10 1935-08-13 Yoss Emanuel Pulverized fuel feeder
GB1067194A (en) * 1962-10-17 1967-05-03 Koppers Co Inc Improvements in or relating to rotary feeders
US3387574A (en) * 1966-11-14 1968-06-11 Combustion Eng System for pneumatically transporting high-moisture fuels such as bagasse and bark and an included furnace for drying and burning those fuels in suspension under high turbulence
US4377117A (en) * 1979-12-21 1983-03-22 Kolze Bruce A Particulate waste wood firing system
FR2500122A1 (en) * 1981-02-17 1982-08-20 Heron Pierre Measured solid fuel feed for boiler - has conveyors supplying feed chute to boiler with feed control inlet door

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 7, no. 50 (M-197) [1195], 26th February 1983; & JP-A-57 198 919 (ISHIKAWAJIMA HARIMA JUKOGYO K.K.) 06-12-1982 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1469253A1 (en) * 2002-11-07 2004-10-20 Tokyo Elex Co., Ltd. Waste treatment method and treatment facility
EP1469253A4 (en) * 2002-11-07 2007-01-03 Tokyo Elex Co Ltd Waste treatment method and treatment facility
US7392753B2 (en) 2002-11-07 2008-07-01 Tokyo Elex Co., Ltd. Process and apparatus for disposal of wastes
WO2004083723A1 (en) * 2003-03-20 2004-09-30 Rolf Tews Method and device for feeding industrial combustion plants with wastes, in particular with secondary fuels
EP2266897A1 (en) * 2008-03-24 2010-12-29 Kobelco Eco-solutions Co., Ltd. Waste conveyor and waste treating system with the same
EP2266897A4 (en) * 2008-03-24 2011-06-01 Kobelco Eco Solutions Co Ltd Waste conveyor and waste treating system with the same
CN102192524A (en) * 2011-03-24 2011-09-21 华新环境工程有限公司 System for comprehensively utilizing refuse derived fuel in cement kiln
CN102192524B (en) * 2011-03-24 2012-07-18 华新环境工程有限公司 System for comprehensively utilizing refuse derived fuel in cement kiln
JP2016125789A (en) * 2015-01-07 2016-07-11 株式会社神鋼環境ソリューション Waste supply device and operating method therefor

Also Published As

Publication number Publication date
NL8402675A (en) 1986-04-01
DE3562524D1 (en) 1988-06-09
ATE34037T1 (en) 1988-05-15
EP0175407B1 (en) 1988-05-04

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