EP1664631A1 - Procede d'incineration de dechets solides - Google Patents

Procede d'incineration de dechets solides

Info

Publication number
EP1664631A1
EP1664631A1 EP04765005A EP04765005A EP1664631A1 EP 1664631 A1 EP1664631 A1 EP 1664631A1 EP 04765005 A EP04765005 A EP 04765005A EP 04765005 A EP04765005 A EP 04765005A EP 1664631 A1 EP1664631 A1 EP 1664631A1
Authority
EP
European Patent Office
Prior art keywords
combustion
waste
fluidized bed
chromium
content
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.)
Withdrawn
Application number
EP04765005A
Other languages
German (de)
English (en)
Inventor
Gurudas Samant
Gunnar Lischke
Eckhardt Lehmann
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.)
Doosan Lentjes GmbH
Original Assignee
Lurgi Lentjes AG
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 Lurgi Lentjes AG filed Critical Lurgi Lentjes AG
Publication of EP1664631A1 publication Critical patent/EP1664631A1/fr
Withdrawn legal-status Critical Current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
    • F23G5/30—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
    • F23G5/008—Incineration of waste; Incinerator constructions; Details, accessories or control therefor adapted for burning two or more kinds, e.g. liquid and solid, of waste being fed through separate inlets
    • 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
    • F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations

Definitions

  • the invention relates to a process for the combustion of solid waste, in particular domestic waste, industrial waste, special waste, waste wood individually or in a mixture, with a grain size of up to 300 mm and / or sewage sludge in a gas-solid reactor, in which the waste and / or sewage sludge in a rotating sub-stoichiometric fluidized bed of high turbulence produced by blowing primary combustion air from inert fluidization material with a particle size of ⁇ 2 mm, having a temperature of 550 to 750 ° C, dried in the fluidized bed, gasified and partially burned, the combustion products in one Above the fluidized bed with secondary combustion air exposed space at a temperature of 850 to 930 ° C and with a dwell time of at least 2 s completely afterburned, the combustion gases emerging from the gas-solid reactor are fed to a steam boiler and a partial flow of the combustion gases to de r Dust is returned to the fluidized bed as recirculation air.
  • Fluidization material preferably made of sand with a grain size of ⁇ 2 mm, which may also contain inert material grains with a similar grain size, is set in rotating motion by the arrangement of different nozzle numbers and by the introduction of different amounts of primary combustion air and by deflectors attached above the vortex chamber. whereby a fluidized bed of high turbulence and strong cross-mixing of the fluidized bed content consisting of mirror-image counter-rotating elliptical rolls is formed. Since the fluidized bed is operated with substoichiometry and at a temperature of approx.
  • the coarse-grained combustion residues are separated into magnetic and non-magnetic parts separately from each other by means of various conveying units, sieves and magnetic separators, while the screened fluidizing material is returned to the gas-solid reactor.
  • the exhaust gas recirculation enables a constant temperature in the fluidized bed, on the other hand it reduces the excess air, so that the exhaust gas losses are reduced and the thermal efficiency is increased.
  • a landfill of the Combustion residues on household waste landfills generally occur because the permissible limit values for chromium (VI) have been exceeded - according to DIN 38414, part 4, the permissible concentration of chromium (VI) in waste eluates is 0.1 mg / l or the soluble proportion per kg of waste 1.0 mg - not taken into account, so that such incineration residues have to be mainly disposed of in special waste or in underground landfills and thus comparatively high disposal costs arise.
  • EP-A-1123719 describes a process for the treatment of chromium (VI) compound-containing residues from chemical, metallurgical and combustion processes, in which the residues contain at least one of the compounds iron sulfate (FeSO -nH 2 O), iron chloride (FeCI 2 ), iron ammonium sulfate [Fe (NH 4 ) 2 (SO 2 ) -nH O] and manganese sulfate (MnSO 4 ) in one Environment with a pH value of> 4 can be mixed.
  • the chromium (VI) content of the residues can be reduced to 0.1 mg / kg.
  • VI chromium
  • the gases discharged from the gas-solid reactor have a chromium (VI) content of up to 5 mg / kg and a grain size of up to 2 mm, based on the chromium content, 2 to 3 times the amount of iron sulfate and / or iron chloride and / or manganese sulfate, in the form of an up to 30% aqueous solution, mixed and the mixture is homogenized at a temperature of 80 to 200 ° C. , This measure allows the chromium (VI) content of the combustion residues to be reduced to values of at least 0.1 mg / kg.
  • a preferred embodiment of the method according to the invention consists in that the combustion residues by sieving into the screen overflow having a chromium (VI) content of ⁇ 1 mg / kg with a grain size of> 2 mm and the one chrome (VI) content from 1 to 5 mg / kg sieve having a grain size of ⁇ 2 mm separated and only the sieve is treated with the aqueous solution containing iron sulfate and / or iron chloride and / or manganese sulfate.
  • a chromium (VI) content of ⁇ 1 mg / kg with a grain size of> 2 mm
  • the one chrome (VI) content from 1 to 5 mg / kg sieve having a grain size of ⁇ 2 mm separated and only the sieve is treated with the aqueous solution containing iron sulfate and / or iron chloride and / or manganese sulfate.
  • the dust particles resulting from the utilization of the combustion exhaust gases in the steam boiler are 1.5 to 5 mg / kg Chromium (VI) contained, mixed with the sieve pass.
  • the small amount of combustion residues with a grain size of> 2 mm contained in the sieve passage can be separated by sieving again and added to the sieve overflow.
  • the pH of the aqueous mixture is adjusted to 4 to 12, preferably by adding Kaik.
  • the free flow cross-section of the gas-solid-state reactor 6 is narrowed upwards by obliquely arranged deflector plates 13, 14.
  • the discharge of the combustion residues and the fluidization material is supported by the movement of the fluidized bed and the beveling of the nozzle base 7 and takes place through the discharge chutes 11, 12 arranged laterally next to the nozzle base 7.
  • flue gas is returned via line 18, which is drawn off by means of a recirculation blower 20 after cooling in the steam boiler 19 and dedusting (not shown) in a cyclone, an electrostatic filter and two washers.
  • the flue gas recirculation enables on the one hand a constant temperature in the swirl chamber 5 and on the other hand a reduction in the excess air and thus a reduction in the exhaust gas losses or an increase in the thermal efficiency.
  • the temperature in the free space 15 is approximately 930 ° C. in order to avoid caking in the gas-solid reactor 6.
  • the combustion residues continuously discharged from the swirl chamber 5 via the discharge chutes 11, 12 contain in large quantities the fluidization material, which generally consists of sand and contains small amounts of inert substances of similar grain size.
  • the combustion residues withdrawn via lines 21, 22 and added to four water-cooled screws 23 are fed to the screening device 25 via line 24.
  • the sieve passage consisting essentially of fluidization material, is discharged via line 26 and conveyed into the feed container 28 by means of a bucket elevator 27.
  • the fluidization material is fed back into the gas-solid reactor 6 via line 29.
  • the screen overflow discharged via line 30 is separated into coarse-grained combustion residues and ferrous metals by means of the magnetic separator 31 and the ferrous metals are discharged via line 32.
  • the coarse-grained combustion residues with a grain size of> 2 mm are fed via line 33 to a screening device 34.
  • the screen overflow which usually has a chromium (VI) content with a permissible concentration of ⁇ 1 mg / kg, is discharged via line 35 and can be used without any problems, while that with a chromium (VI) content of 1 to 3 mg / kg loaded sieve passage is passed via line 36 into the mixing device 37, in which the sieve passage is mixed with FeSO -7H 2 O added via line 38 with the addition of water. After the mixture has been conditioned, the undissolved part of the residue is separated off by filtration and the chromium (VI) content is determined in the eluate according to DIN 38405, part 24.
  • the combustion residues discharged by the measures according to the invention and discharged from the mixing device 37 via line 39 can easily be deposited or otherwise easily used.
  • the combustion exhaust gases leaving the gas-solids reactor 6 via line 40 are fed to the steam boiler 19, from which the steam generated is discharged via line 41 and the separated dust particles containing a chromium (VI) content of 1.5 to 5 mg / kg by means of the discharge screw 42 to be abandoned via line 43 of the mixing device 37.
  • the exhaust gases emerging from the steam boiler 19 via line 44 are then dedusted in several stages.
  • Residues with an average chromium (VI) content of 2.5 mg / kg and a grain size of 3 to 4 mm are generated in a continuously operating incinerator when household waste and hospital waste are incinerated. These residues are stirred in a commercial mixer with 0.75% by weight ferrogranul (FeSO 4 -6H 2 O) with the addition of water with lime dissolved therein to adjust the pH to 9 for 15 minutes. The moisture content of the mixture is 20% by weight.
  • the average samples of the residues taken at intervals of 60 min contain 0.1 mg / kg chromium (VI) with a chromium (VI) content in the eluate of ⁇ 0.01 mg / l.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Processing Of Solid Wastes (AREA)
  • Gasification And Melting Of Waste (AREA)

Abstract

L'invention concerne un procédé d'incinération de déchets solides dans un réacteur gaz-matière solide. Les déchets sont introduits dans un lit fluidisé rotatif chaud de 550 à 750 0C, séchés, gazéifiés et partiellement incinérés. Les produits d'incinérations sont rebrûlés dans un espace libre situé au-dessus du lit fluidisé à une température de 850 à 930 0C et un flux partiel des gaz de combustion est renvoyé au lit fluidisé. Pour garantir la réduction de la teneur en chrome VI des résidus de combustion à < 1.0 mg/kg d'imbrûlés, on les mélange, par rapport à la teneur en chrome, à 2 à 3 fois la quantité de sulfate de fer et/ou de chlorure de fer et/ou de sulfate de manganèse dans une solution jusqu'à 30 % aqueuse et on homogénéise ce mélange à une température de 80 à 200 °C.
EP04765005A 2003-09-10 2004-09-09 Procede d'incineration de dechets solides Withdrawn EP1664631A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003141610 DE10341610B8 (de) 2003-09-10 2003-09-10 Verfahren zur Verbrennung von festen Abfällen
PCT/EP2004/010072 WO2005026618A1 (fr) 2003-09-10 2004-09-09 Procede d'incineration de dechets solides

Publications (1)

Publication Number Publication Date
EP1664631A1 true EP1664631A1 (fr) 2006-06-07

Family

ID=34305630

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04765005A Withdrawn EP1664631A1 (fr) 2003-09-10 2004-09-09 Procede d'incineration de dechets solides

Country Status (4)

Country Link
EP (1) EP1664631A1 (fr)
CN (1) CN1846097A (fr)
DE (1) DE10341610B8 (fr)
WO (1) WO2005026618A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100447489C (zh) * 2005-09-16 2008-12-31 中国科学院工程热物理研究所 一种带有复合干燥器的湿污泥焚烧处理装置
CN100453905C (zh) * 2005-06-21 2009-01-21 中国科学院工程热物理研究所 一种带复合干燥器的循环流化床湿污泥干化焚烧处理方法
JP5030568B2 (ja) * 2005-12-27 2012-09-19 信越化学工業株式会社 アルカリセルロース及びセルロースエーテルの製造方法
DK3388744T3 (da) * 2017-04-12 2020-02-03 Improbed Ab System og fremgangsmåde til genanvendelse af fluidiseret kedellejemateriale
CN108488804B (zh) * 2018-04-02 2019-05-31 北京戎聚环境科技有限公司 用于固体废物处理的等离子体重整燃烧室和方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3153091B2 (ja) * 1994-03-10 2001-04-03 株式会社荏原製作所 廃棄物の処理方法及びガス化及び熔融燃焼装置
JPS5939368B2 (ja) * 1977-03-14 1984-09-22 堺化学工業株式会社 クロム含有粉状物の直接処理方法
US5156099A (en) * 1988-08-31 1992-10-20 Ebara Corporation Composite recycling type fluidized bed boiler
US5304710A (en) * 1993-02-18 1994-04-19 Envar Services, Inc. Method of detoxification and stabilization of soils contaminated with chromium ore waste
DE10000709A1 (de) * 2000-01-10 2001-07-19 Mg Technologies Ag Verfahren zur Behandlung von Chrom(VI)-haltigen Rückständen
EP1286112A1 (fr) * 2001-08-09 2003-02-26 Siemens Aktiengesellschaft Brûleur à prémélange et procédé opératoire dudit brûleur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005026618A1 *

Also Published As

Publication number Publication date
DE10341610B4 (de) 2007-06-06
WO2005026618A1 (fr) 2005-03-24
CN1846097A (zh) 2006-10-11
DE10341610A1 (de) 2005-05-04
DE10341610B8 (de) 2007-09-27

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