EP0237712B1 - Verfahren zur Verbrennung für Wirbelbettfeuerungen - Google Patents

Verfahren zur Verbrennung für Wirbelbettfeuerungen Download PDF

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Publication number
EP0237712B1
EP0237712B1 EP19870100514 EP87100514A EP0237712B1 EP 0237712 B1 EP0237712 B1 EP 0237712B1 EP 19870100514 EP19870100514 EP 19870100514 EP 87100514 A EP87100514 A EP 87100514A EP 0237712 B1 EP0237712 B1 EP 0237712B1
Authority
EP
European Patent Office
Prior art keywords
fluidized bed
combustion
incinerator
refuse
exhaust gas
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
Application number
EP19870100514
Other languages
English (en)
French (fr)
Other versions
EP0237712A1 (de
Inventor
Minoru Narisoko
Satoshi Inoue
Sadahiro Yamada
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.)
IHI Corp
Original Assignee
IHI Corp
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 IHI Corp filed Critical IHI Corp
Publication of EP0237712A1 publication Critical patent/EP0237712A1/de
Application granted granted Critical
Publication of EP0237712B1 publication Critical patent/EP0237712B1/de
Expired legal-status Critical Current

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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
    • F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
    • 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
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage

Definitions

  • This invention relates to a method of controlling the combustion for fluidized bed incinerators for disposing of refuse such as municipal wastes. More particularly, it is concerned with a method of stabilizing combustion by recirculating the exhaust gas.
  • Fluidized bed incinerators are constructed in such a way that the substances such as municipal wastes that are to be incinerated (called “refuse” hereinafter) are incinerated away in a fluidized bed, formed together with a fluidizing medium such as sand (called “fluidizing medium” hereinafter) over the air diffuser which is provided within the fluidized bed incinerator body (called “furnace body” hereinafter), as they are thrown thereonto, both by means of the primary air that is injected from said air diffuser.
  • a fluidizing medium such as sand
  • the freeboard part of the furnace body above and over said fluidized bed constitutes a combustion chamber in which to burn the pyrolysis, or the thermal decomposition, gas generated in the fluidized bed in afterburning (called “afterburning chamber” hereinafter) with the secondary air introduced thereinto.
  • the exhaust gas that has been generated in the afterburning chamber and in the fluidized bed is discharged out of the furnace body from the furnace top, cleaned up, then released to the atmosphere.
  • the conventional method of combustion for such fluidized bed incinerator is simply to provide the primary and the secondary airs to burn the refuse.
  • properties of refuse as calorific value, water content, and size of lumps are changing from moment to moment, maintenance of stable combustion is difficult.
  • CH-A 577 144 discloses a combustion method according to which a refuse to be combusted and a fluidizing medium are fluidized with primary air so as to form a fluidized bed and to combust the refuse.
  • the primary air is supplied into the incinerator body by air diffuser means provided in the incinerator body.
  • DE-A 2 410 477 refers to a combustion method and describes an apparatus according to which it is possible to recirculate exhaust gases from the exhaust line to the primary air supply line and to mix said exhaust gases with the primary air supplied to the incinerator body. Therefore, said publication only refers to the recirculation of exhaust gases to the primary air supply means. This brings the drawback that a large powerful blowing is required in order to fluidize the refuse as well as the fluidizing medium so that also the method known from said DE-A 2 410 477 is achieved with the same drawback as the above-cited CH-A 577 144.
  • US-A 4 295 817 shows an apparatus in which inert gases are mixed with recirculated exhaust gases.
  • the teaching of said publication is similar to the teaching known form the above-cited DE-A 2 410 477.
  • EP-A 49 592 which also describes the recirculation of exhaust gases to be mixed with the primary air supply.
  • the object underlying the present invention is to provide a method of controlling the combustion for fluidized bed incinerators that is free of the drawbacks known from the state of the art and that is capable of controlling the rise of temperature of the fluidized bed, thereby making the drying, pyrolysis and combustion of refuse sluggish and stabilized. It is another object of the present invention to prevent generation of unburnt gas and to decrease NOx.
  • Said objects are solved by introducing a part of the discharged exhaust gas of the step comprising the discharging of exhaust gas produced upon combustion of the pyrolysis gas to the incinerator above the fluidized bed and to the primary air, or by introducing a part of the discharged exhaust gas of the step comprising the discharging of exhaust gas produced upon combustion of the pyrolysis gas to the fluidized bed and the secondary air.
  • the fluidized bed incinerator 1 is equipped with an air diffuser comprising a plurality of air diffuser tubes 2, whose duty it is both to form a fluidized bed 3 out of the substances to be incinerated a such as municipal wastes (the refuse) and a fluidizing medium b such as sand (the fluidizing medium) and to burn the refuse therein with the primary air sand air diffuser tubes 2 inject thereinto.
  • the air diffuser tubes 2 are positioned in the lower part of the incinerator body (the furnace body) in a plural number and in parallel to each other, each tube having a large number of nozzles from which to blow the primary air in.
  • a primary air charging tube 6 is connected to the air diffuser tubes 2 through a primary air blower 5.
  • the freeboard space of the furnace body above and over the fluidized bed 3 serves as the secondary combustion chamber (afterburning chamber) 7 in which to burn the pyrolysis gas generated in the fluidized bed 3.
  • an uptake 9 to lead the exhaust gas discharged out of the afterburning chamber 7 to a stack 8 through a gas cooler 10, a gas clean-up unit 11 such as an electrostatic precipitator, and an induced draft fan 12 in said order.
  • a secondary air charging tube 14 To the afterburning chamber 7, there is connected a secondary air charging tube 14 through a secondary air blower 13 to supply the secondary air thereinto. Also provided to the afterburning chamber 7 are a refuse charging port 15 and a fluidizing medium charging port 20, respectively through which the refuse a and the fluidizing medium b are thrown thereinto.
  • an exhaust returning tube 16 is provided to the uptake 9 at a place downstream to the induced draft fan 12 to be connected to the afterburning chamber 7 through an exhaust circulator fan 17, said exhaust returning tube 16 being equipped with a valve 21 at a place downstream of the exhaust circulator fan 17.
  • a branch pipe 18 that branches off the exhaust returning tube 16 at a place between the valve 21 and the exhaust circulator fan 17 is connected to the primary air charging tube 6 at a place upstream of the primary air blower 5 so as to supply the exhaust gas to the air diffuser tubes 2.
  • a packed bed 4 made up of the combustion residue c of refuse a and the fluidizing medium b.
  • a screw conveyor 22 to take out the combustion residue c and the fluidizing medium b; the combustion residue c and the fluidizing medium b taken out of the furnace body thereby are separated from each other by the separator 23, the fluidizing medium b returning into the furnace body through a returning line, then through the charging port 20.
  • the temperature of the fluidized bed 3 is decreased, and the combustion is stabilized more easily. Also, since the flame temperature of the afterburning chamber 7 is controlled by the fed back exhaust, the temperature of the fluidized bed 3 is indirectly controlled, aiding stabilization of combustion in the fluidized bed 3.
  • the branch pipe 18 of the exhaust returning tube 16 may be led directly into the fluidized bed 3 as shown in Fig. 2.
  • the exhaust returning tube 16 may be connected to the secondary air charging tube 14 at a place upstream of the secondary air blower 13 as shown in Fig. 2.
  • the amount of the exhaust gas to be fed back may be automatically controlled through operating the valve 19 and the valve 21 by measuring the temperature of the fluidized bed 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Claims (2)

1. Verfahren zur Steuerung der Verbrennung für eine Wirbelbettfeuerung (1), das folgende Stufen umfaßt:
a) Fluidisieren von Müll (a) und eines Wirbelmediums (b) mit Primärluft zur Bildung eines Wirbelbettes (3) und zur Verbrennung des Mülls (a), wobei die Primärluft durch im Verbrennungsschacht vorgesehene Luftverteilereinrichtungen (2) in den Verbrennungsschacht (1) geleitet wird;
b) Verbrennen des bei der Verbrennung gemäß Stufe (a) erzeugten Pyrolysegases mit Sekundärluft in dem Verbrennungsschacht (1); c) Ableiten des bei der Verbrennung gemäß Stufe
(b) erzeugten Abgases aus dem Verbrennungsschacht (1);
dadurch gekennzeichnet, daß das Verfahren ferner folgende Stufe umfaßt:
d) Einleiten eines Teils des abgeleiteten Abgases gemäß Stufe (c) in den Verbrennungsschacht (1) oberhalb des Wirbelbettes und in die Primärluft.
2. Verfahren zur Steuerung der Verbrennung in einer Wirbelbettfeuerung (1), das folgende Stufen umfaßt:
a) Fluidisieren von Müll (a) und eines Wirbelmediums (b) mit Primärluft zur Bildung eines Wirbelbettes (3) und zur Verbrennung des Mülls (a), wobei die Primärluft durch im Verbrennungsschacht vorgesehene Luftverteilereinrichtungen (2) in den Verbrennungsschacht (1) geleitet wird;
b) Verbrennen des bei der Verbrennung gemäß Stufe (a) erzeugten Pyrolysegases mit Sekundärluft in dem Verbrennungsschacht (1); und c) Ableiten des bei der Verbrennung gemäß Stufe
(b) erzeugten Abgases aus dem Verbrennungsschacht (1);
dadurch gekennzeichnet, daß das Verfahren ferner folgende Stufe umfaßt:
d) Einleiten eines Teils des abgeleiteten Abgases gemäß Stufe (c) in das Wirbelbett (3) und in die Sekundärluft.)
EP19870100514 1986-02-05 1987-01-16 Verfahren zur Verbrennung für Wirbelbettfeuerungen Expired EP0237712B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP22002/86 1986-02-05
JP2200286A JPS62182516A (ja) 1986-02-05 1986-02-05 流動床式焼却炉の燃焼方法

Publications (2)

Publication Number Publication Date
EP0237712A1 EP0237712A1 (de) 1987-09-23
EP0237712B1 true EP0237712B1 (de) 1990-05-09

Family

ID=12070798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870100514 Expired EP0237712B1 (de) 1986-02-05 1987-01-16 Verfahren zur Verbrennung für Wirbelbettfeuerungen

Country Status (4)

Country Link
EP (1) EP0237712B1 (de)
JP (1) JPS62182516A (de)
CA (1) CA1290988C (de)
DE (2) DE3762681D1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3712801A1 (de) * 1987-04-15 1988-11-03 Babcock Werke Ag Verfahren zum verfeuern von insb. salzhaltiger braunkohle
CA2018910C (en) * 1989-06-16 2000-02-22 Masaaki Furukawa Method of controlling combustion in a furnace
JP2957627B2 (ja) * 1990-03-15 1999-10-06 大阪瓦斯株式会社 都市ゴミ焼却溶融設備
WO2002090829A1 (en) * 2001-05-09 2002-11-14 Fortum Oyj Method and arrangement for reducing nitrogen oxide emissions froma fluidized bed combustion
KR100660757B1 (ko) * 2002-05-02 2006-12-26 제이에프이 엔지니어링 가부시키가이샤 폐기물소각로의 조업방법 및 폐기물소각로
CN105351944B (zh) * 2015-12-10 2017-12-08 重庆三峰卡万塔环境产业有限公司 一种改进的炉排炉垃圾焚烧装置
CN105910115B (zh) * 2016-04-19 2018-12-11 中石化炼化工程（集团）股份有限公司 一种废液焚烧装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2037561A1 (de) * 1970-07-29 1972-02-03 Metallgesellschaft AG, 6000 Frank fürt Schlammverbrennung
CH577144A5 (en) * 1974-10-03 1976-06-30 Mustad Stoperi & Mek Verksted Low grade fuel burning fluidised bed - uses fluidisation gas mixture made from primary air and combustion gases
DK310979A (da) * 1978-08-04 1980-02-05 Energy Equip Fremgangsmaade til styring af driften af fyringsanlaeg med fluidiseret bund samt midler til brug ved fremgangsmaadens gennemfoerelse
JPS56162312A (en) * 1980-05-19 1981-12-14 Hitachi Ltd Inhibiting and controlling device for nox of incinerator
AU547991B2 (en) * 1980-10-06 1985-11-14 Energy Equipment Co. Ltd., The Fluidised bed combustion units
JPS6046324A (ja) * 1983-08-24 1985-03-13 Kawasaki Steel Corp 連続焼なまし炉設備

Also Published As

Publication number Publication date
JPS62182516A (ja) 1987-08-10
CA1290988C (en) 1991-10-22
DE237712T1 (de) 1988-02-04
EP0237712A1 (de) 1987-09-23
DE3762681D1 (de) 1990-06-13

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