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WO1994009320A1 - Fours - Google Patents

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Publication number
WO1994009320A1
WO1994009320A1 PCT/GB1993/002096 GB9302096W WO9409320A1 WO 1994009320 A1 WO1994009320 A1 WO 1994009320A1 GB 9302096 W GB9302096 W GB 9302096W WO 9409320 A1 WO9409320 A1 WO 9409320A1
Authority
WO
WIPO (PCT)
Prior art keywords
grate
primary
waste material
combustion chamber
furnace according
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.)
Ceased
Application number
PCT/GB1993/002096
Other languages
English (en)
Inventor
Peter Reginald Piggin
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.)
Erithglen Ltd
Original Assignee
Erithglen 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 Erithglen Ltd filed Critical Erithglen Ltd
Publication of WO1994009320A1 publication Critical patent/WO1994009320A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F23G5/002—Incineration of waste; Incinerator constructions; Details, accessories or control therefor characterised by their grates
    • 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
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion

Definitions

  • the invention relates to furnaces, particularly to furnaces for incinerating hazardous waste material such as human and animal tissue, blood or other body fluids, which are all classified as clinical waste, and drugs or other pharmaceutical products arising directly from manufacturing processes.
  • the furnace may be incorporated in a boiler capable cf using the generated heat to produce hot water for example for a central heating system.
  • a waste-fired boiler is illustrated in the present Applicant's International Patent Application, published as WO 88/02834 on 19S8 April 21.
  • variable combustion properties of diverse waste materials provide an additional difficulty in ensuring consistently low emissions.
  • the invention provides a furnace for incinerating waste material, including a combustion chamber, an inlet for introducing waste material to the combusticn chamber, an outlet for removing exhaust gases from tne combustion chamber, a burner for regulating the temperature inside the combustion chamber, a primary grate in the inlet and a secondary grate in the combustion chamber, CHARACTERIZED IN THAT the primary grate is located above the combustion chamber so tnat the underside of waste material on the primary grate can ce ignited from the combustion chamber.
  • the primary grate is preferaoly rotatable so as to drop waste material from the primary grate on the secondary grate.
  • the primary grate may alternatively be fixed and may have gaps through which waste material can fall.
  • Means may be provided for weighing the waste material on the primary grate.
  • the secondary grate preferably takes the form of a pivotable trap door to allow the removal of ash and unburned waste from the combustion chamber.
  • a plurality of such primary grates arranged in a vertical series may be provided in the inlet.
  • a further burner may be provided in the outlet to effect more complete combustion of the emissions from the combustion chamber.
  • the waste material may be fed to the inlet through a rotary air valve, which allows a limited supply of air into the inlet to assist combustion at the first grate.
  • a pair of the furnaces may conveniently be supplied alternately with waste material through a single rotary air valve.
  • the furnace forms part of a boiler.
  • the furnace may be surrounded by a water jacket and the conventional apparatus of a three pass boiler system.
  • the invention also provides a method of incinerating waste material, comprising the steps of: introducing the waste material onto a primary grate above a combustion chamber to ignite the underside of the waste material en the primary grate; causing ignited waste material to fall from the primary grate onto a secondary grate in the combustion chamber; and combusting the waste material en the secondary grate, , using a burner tc regulate the temperature in the combustion chamber.
  • the arrangement has also been found to reduce smoke emissions from the incinerator which are caused by incomplete combustion. No unburnt material can now be detected in the ash residue.
  • the Figure illustrates, schematically and in vertical cross section, a furnace in accordance with the present invention.
  • the furnace of the invention is contained within an upright, generally cylindrical, refractory lined vessel 2.
  • a space in the bottom of the vessel 2 provides a combustion chamber 4.
  • a central wall 6 divides the upper part of the vessel 2 into an inlet 8 and an outlet 10.
  • a chute 12 leads from a rotary air valve (not shown) to the inlet 8.
  • a first primary grate 14 is rotatably mounted in an outer wall of the inlet 8. It is shown in solid lines at its normal operating position and in chain lines rotated through 90° from its normal position.
  • the first primary grate 14 may be perforated by holes through which waste material can fall.
  • a second primary grate 15 may optionally be provided in the inlet below the first primary grate 14, so that waste material falling from the first primary grate 14 will land on the second primary grate 15.
  • the second primary grate 15 is rotatably mounted in the same manner as the first primary grate 14.
  • the base of the combustion chamber 4 comprises a pivotably mounted secondary grate 16.
  • the secondary grate 16 is shown in solid lines at its normal operating position and in chain lines pivoted away from its normal position.
  • a gap 17, tnrough Around the edge of the secondary grate 16 is a gap 17, tnrough which air for combustion may be blown into the combustion chamber 4.
  • a primary burner 18 is mounted in a wall of the combustion chamber 4.
  • the burner 18 is fuelled by oil or gas and may be controlled in response to the measurements of a temperature sensor in the combustion chamber 4 to regulate the temperature.
  • a secondary burner 20 in the outlet 10 effects further combustion of the gases from the combustion chamber 4 before they are finally emitted.
  • the vessel 2 housing the furnace is surrounded by a water jacket and the conventional arrangement of pipes and pumps for a three pass boiler system (not illustrated).
  • waste material is fed, generally in bags, into the rotary air valve (not shown) , which upon being rotated deposits the waste in the inlet chute 12.
  • the waste material slides down the chute 12 under gravity and lands on the first primary grate 14, which is in its horizontal position (as shown in solid lines).
  • the waste material is exposed to radiant heat from the combustion chamber 4 below, or from the second primary grate 15 if it is present, which causes the waste to ignite from the underside and releases any volatile waste slowly at the low temperature on the grate 14.
  • the waste begins to burn on the first primary grate 14, supplied with air that seeps through the rotary air valve and down the inlet 8.
  • the waste disintegrates and small pieces of burning waste drop through openings in the grate. If the second primary grate 15 is provided, the falling waste then lands on that second primary grate 15, which operates in a similar manner to the first primary grate 14.
  • each primary grate 14,15 is rotated tnrough 180° to prevent the accumulation of large, unburnt pieces of waste material.
  • the burning waste falling from the primary grates 14,15 lands on the secondary grate 16 in the base of the combustion chamber 4. There it is supplied with oxygen and kept agitated by the injection of air from below through the gaps 17.
  • the temperature in the combustion cha oer 4 may tend to vary.
  • the temperature sensor (not snown) therefore monitors the temperature and regulates the operation of the burner 18 to maintain the comoustion chamber temperature above a minimum value necessary to achieve effective combustion.
  • the operating temperature in the combustion chamber 4 is aoove 1000°C.
  • the secondary grate 16 is pivoted to the position shown in chain lines to remove ash and other combustion residues from the chamber 4.
  • tne secondary burner 20 may be operated to maintain the combustion temperature in the outlet 10.
  • other means may be provided for treating the emissions, such as the addition of lime to neutralize acid gases.

Landscapes

  • Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

Un four pour l'incinération de déchets dangereux comprend une chambre de combustion (4); une entrée (8) pour introduire les déchets dans la chambre de combustion (4); une sortie (10) pour évacuer les gaz d'échappement de la chambre de combustion (4); un brûleur (18) pour réguler la température à l'intérieur de la chambre de combustion (4); une ou plusieurs grilles primaires (14,15) situées dans l'entrée (8); et une grille secondaire (16) située dans la chambre de combustion (4). Les grilles primaires (14, 15) sont disposées au-dessus de la chambre de combustion (4) de sorte que le côté inférieur des déchets peut prendre feu par le bas, depuis la chambre de combustion (4) située au-dessous. La matière en combustion tombant des grilles primaires (14, 15) sur la grille secondaire (16) est oxydée d'une manière efficace, ce qui améliore la qualité des émissions et en particulier diminue les concentrations en monoxyde de carbone.
PCT/GB1993/002096 1992-10-16 1993-10-11 Fours Ceased WO1994009320A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9221821.3 1992-10-16
GB929221821A GB9221821D0 (en) 1992-10-16 1992-10-16 Furnaces

Publications (1)

Publication Number Publication Date
WO1994009320A1 true WO1994009320A1 (fr) 1994-04-28

Family

ID=10723601

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/002096 Ceased WO1994009320A1 (fr) 1992-10-16 1993-10-11 Fours

Country Status (2)

Country Link
GB (1) GB9221821D0 (fr)
WO (1) WO1994009320A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1844745B (zh) * 2006-04-21 2010-05-12 四川雷鸣生物环保工程有限公司 城市垃圾颗粒燃料智能焚烧炉

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE122087C (fr) *
CH467433A (de) * 1966-11-23 1969-01-15 Bjorklund & Vedin Nederland N Müllverbrennungsanlage
DE1401895A1 (de) * 1961-06-24 1969-01-30 Koppers Wistra Ofenbau Gmbh Muellverbrennungsofen
FR2057275A5 (fr) * 1969-08-08 1971-05-21 Missenard Andre
WO1982000188A1 (fr) * 1980-07-08 1982-01-21 S Johansson Moyens dans des installations de fours
WO1988002834A1 (fr) * 1986-10-11 1988-04-21 Erithglen Limited Four
JPH0221120A (ja) * 1988-07-08 1990-01-24 Sasakura Eng Co Ltd 廃棄物のバッチ式焼却装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE122087C (fr) *
DE1401895A1 (de) * 1961-06-24 1969-01-30 Koppers Wistra Ofenbau Gmbh Muellverbrennungsofen
CH467433A (de) * 1966-11-23 1969-01-15 Bjorklund & Vedin Nederland N Müllverbrennungsanlage
FR2057275A5 (fr) * 1969-08-08 1971-05-21 Missenard Andre
WO1982000188A1 (fr) * 1980-07-08 1982-01-21 S Johansson Moyens dans des installations de fours
WO1988002834A1 (fr) * 1986-10-11 1988-04-21 Erithglen Limited Four
JPH0221120A (ja) * 1988-07-08 1990-01-24 Sasakura Eng Co Ltd 廃棄物のバッチ式焼却装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 159 (M - 0956) 28 March 1990 (1990-03-28) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1844745B (zh) * 2006-04-21 2010-05-12 四川雷鸣生物环保工程有限公司 城市垃圾颗粒燃料智能焚烧炉

Also Published As

Publication number Publication date
GB9221821D0 (en) 1992-12-02

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