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WO2001083126A1 - Procede et dispositif de traitement de cendres volantes - Google Patents

Procede et dispositif de traitement de cendres volantes Download PDF

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Publication number
WO2001083126A1
WO2001083126A1 PCT/JP2001/003435 JP0103435W WO0183126A1 WO 2001083126 A1 WO2001083126 A1 WO 2001083126A1 JP 0103435 W JP0103435 W JP 0103435W WO 0183126 A1 WO0183126 A1 WO 0183126A1
Authority
WO
WIPO (PCT)
Prior art keywords
fly ash
sludge
melting furnace
waste
waste melting
Prior art date
Application number
PCT/JP2001/003435
Other languages
English (en)
Japanese (ja)
Inventor
Toshihiro Tatami
Tsuneo Matsudaira
Yasuo Suzuki
Tomohiro Yoshida
Yuichi Yamakawa
Original Assignee
Nkk Corporation
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 Nkk Corporation filed Critical Nkk Corporation
Publication of WO2001083126A1 publication Critical patent/WO2001083126A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
    • F23J3/06—Systems for accumulating residues from different parts of furnace plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2209/00—Specific waste
    • F23G2209/30—Solid combustion residues, e.g. bottom or flyash
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
    • F23J2900/01005—Mixing water to ash

Definitions

  • the present invention relates to a method for treating fly ash that is scattered and collected from a furnace during heat treatment of waste, such as waste melting treatment, waste incineration treatment, or waste incineration residue melting treatment. And its device. Background
  • the waste loaded contains flammable waste
  • the waste is pyrolyzed to produce flammable gas while being preheated on a hot coke bed.
  • This combustible gas is burned by blowing air in the melting furnace or in the secondary combustion furnace, and is sent as a high-temperature gas to the heat recovery unit.
  • the high-temperature gas discharged from the melting furnace is sent to the heat recovery unit.
  • the heat-recovered gas is sent to the dust collection process to remove dust (fly ash), and then sent to the harmful gas removal process to be purified and released.
  • the charged waste incineration residue ⁇ the thermal decomposition residue of the waste descends and melts in the high-temperature combustion zone, becomes molten slag, drops through the coke layer, and collects at the furnace bottom and discharges it. Is done.
  • fly ash collected in dust collectors and the like is also discharged during waste melting treatment, so that treatment must be performed to stabilize harmful metals in the fly ash.
  • Japanese Patent Application Laid-Open No. H11-110014 mentions that fly ash discharged from a waste melting furnace and collected in a gas treatment system is added with a component modifier such as lime powder or quartz powder.
  • a method is disclosed in which after adjusting the basicity to a predetermined range, the fly ash is blown into a furnace from a tuyere provided at the lower part of the furnace to melt fly ash and discharged from the lower part of the furnace as molten slag.
  • fly ash is blown into the lower part of a melting furnace maintained at a high temperature, so that most of the fly ash is quickly melted, and molten Discharged as lag.
  • the amount of fly ash blown exceeds a certain limit, the temperature around the tuyere into which the fly ash is blown drops to a level outside the allowable range. Then, the furnace condition at the bottom of the melting furnace becomes abnormal. This is because, compared to the case where fly ash is not blown, extra heat is required to heat the fly ash. Therefore, this method is suitable for treating a small amount of fly ash, and is unsuitable as a method for treating a large amount of fly ash.
  • the basicity of the fly ash to be blown must be adjusted so that the melt has an appropriate fluidity.
  • This basicity adjustment is performed in order to make the melt of fly ash flow down smoothly.
  • an adjustment operation of adding an appropriate amount of lime powder or adding an appropriate amount of quartz powder must be performed successively. . Therefore, the operation for supplying fly ash to the melting furnace becomes very complicated.
  • the present invention solves the above problems, and can treat a large amount of fly ash without having a complicated device, and a method for treating fly ash which is easy to treat and a method thereof. It is intended to provide a device.
  • the method for treating fly ash according to the present invention comprises the steps of: adding heat to the fly ash scattered from the furnace when the waste is heat-treated to form sludge; and disposing the sludge-like fly ash. It is characterized by being charged into a material melting furnace.
  • the fly ash treatment method is characterized in that the water added to make the fly ash into sludge is water in wastewater or waste with a high water content.
  • the method for treating fly ash according to the present invention is characterized in that sludge-like fly ash is melted in a waste melting furnace and discharged as molten slag.
  • the fly ash processing apparatus ′ in the present invention is provided with: a fly ash measuring and supplying means; a moisture measuring and supplying means; a kneading means for converting the supplied fly ash and moisture into a sludge state; It is characterized by having means for charging sludge-like fly ash into a waste melting furnace.
  • fly ash treatment apparatus of the present invention is characterized in that sludge fly ash is melted in a waste melting furnace and discharged as molten slag.
  • fly ash refers to dust that has been scattered and collected from the furnace during heat treatment of waste, and is generated when the waste is melted. Includes waste generated by incineration or waste generated by incineration residue melting. Therefore, fly ash that can be treated in the present invention is not limited to that generated from a waste melting furnace that treats the fly ash, but may be any other waste incineration equipment or waste melting equipment.
  • fly ash generated from the waste melting furnace does not refer only to fly ash collected by the collector, but is collected by a poiler or cooling tower located between the melting furnace and the dust collector. This is a generic term that also includes dust that is produced.
  • fly ash When fly ash is charged from the upper part of the waste melting furnace and melted, if the fly ash is directly charged into the melting furnace, a large amount of fly ash will be re-scattered. Pre-processing is required. However, according to the study results of the present inventors, It has been found that the pretreatment does not necessarily have to employ a complicated method for granulating fly ash.
  • the fly ash when the fly ash is charged into the waste melting furnace, the fly ash is scattered before reaching the high temperature coke layer deposited at the lower part of the melting furnace. Perform pre-processing just to disable As a pre-treatment, the fly ash is made sludge-like by adding moisture to the fly ash, and the sludge-like fly ash is charged into a melting furnace.
  • fly ash is a muddy substance containing water to such an extent that it does not easily scatter during transportation or loading.
  • the only pretreatment of the fly ash that occurs is to simply turn the powder into mud. Therefore, the processing when charging fly ash into the melting furnace is extremely simple and easy.
  • Fly ash treatment is not performed by blowing into the lower part of the melting furnace, but by charging from the upper part of the melting furnace. Therefore, a desired amount of fly ash can be charged without affecting the high-temperature combustion zone at the lower part of the melting furnace. As a result, a large amount of fly ash can be treated, and fly ash generated in other waste treatment facilities can be accepted and treated. ,
  • water such as industrial water may be used as a water source for the pretreatment of turning fly ash into sludge.
  • wastewater treatment facilities have wastewater (sewage) that must be treated by wastewater treatment equipment, and wastewater treatment equipment discharges waste such as sludge and sludge. Therefore, these wastewaters and wastes having a high moisture content may be added and kneaded. For this reason, according to the present invention, it is possible to perform not only the melting treatment of fly ash but also the treatment of secondary waste such as sewage and sludge.
  • the sludge-like fly ash When the sludge-like fly ash is charged into the melting furnace as described above, most of it falls onto the high-temperature coke layer deposited at the lower part of the melting furnace. Then, it is melted together with the waste residue and mixed into the slag, and is discharged as molten slag. However, in the process of heating the charged fly ash to a high temperature, some fly ash or components in the fly ash may be scattered. However, these materials are collected by a dust collector provided in a later process, re-charged into a melting furnace, and melted. It becomes a melt.
  • the present invention is a technology for charging and melting fly ash into a waste melting furnace for heat-treating waste, wherein the fly ash is charged after being pre-processed into sludge. It is characterized by the following. For this reason, the type of furnace into which the fly ash formed into sludge in the pretreatment is charged is not limited as long as the furnace can melt and discharge the fly ash.
  • the present invention discloses the following. That is,
  • Fly ash processing equipment consists of:
  • a fly ash metering / supplying means for measuring and extracting the fly ash from the fly ash hopper; measuring a water content of the measured fly ash; and supplying a water content to the measured fly ash.
  • Supply means for measuring and extracting the fly ash from the fly ash hopper; measuring a water content of the measured fly ash; and supplying a water content to the measured fly ash.
  • Kneading means for adding the water supplied from the moisture measuring and supplying means to the fly ash supplied from the fly ash measuring and supplying means to form a sludge; and kneading in the kneading means.
  • FIG. 1 is a schematic diagram showing an example of an embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing an example of the configuration of the fly ash charging facility in FIG.
  • FIG. 3 is a schematic diagram showing another example of the configuration of the fly ash charging facility in FIG.
  • FIG. 1 is an explanatory diagram of an example according to an embodiment of the present invention. In the following description of Fig. 1, the case where the waste to be treated is combustible waste will be described.
  • Reference numeral 10 denotes a vertical and cylindrical waste melting furnace.
  • Numeral 1 is a waste charging facility, and waste, coke, and limestone as a slag component modifier are charged to the melting furnace by this facility.
  • Reference numeral 20 denotes fly ash charging equipment for receiving fly ash and charging it into the melting furnace 10. This equipment is usually for receiving fly ash collected in the gas treatment process and charging it into the melting furnace 10, but was collected at another waste treatment facility if necessary. Fly ash can also be accepted and processed. The configuration of the fly ash charging equipment 20 is shown in Fig. 2.
  • the lower part of the melting furnace 10 performs gasification of waste and melting treatment of residues, and the upper part whose diameter has been expanded is a free-pod part.
  • 50 indicates a coke layer deposited on the bottom of the furnace, and 51 indicates a fluidized bed of waste.
  • Reference numeral 12 denotes an outlet for combustion gas, and reference numeral 13 denotes an outlet for molten slag.
  • a main tuyere 14 for blowing air or oxygen-enriched air is provided at the lower part of the melting furnace 10 where the coke layer 50 is formed. Combustion zones are formed and waste residues are melted. At the position where the waste fluidized bed 51 is formed, a sub tuyere 15 for blowing air for flowing the waste is provided. 'Furthermore, a three-stage tuyere 16 for blowing air for burning the generated combustible gas is provided in the freeboard portion above the fluidized bed 51.
  • 31 is a boiler that recovers the heat of the combustion gas discharged from the melting furnace.
  • a cooling tower for cooling, 33 is a dust collector such as a bag filter, 34 is a draft fan, and 35 is a chimney. Fly ash collected by the dust collector 33 and fly ash collected by the boiler 31 and the cooling tower 32 are combined and sent to the fly ash charging facility 20.
  • the exhaust gas outlet, the boiler, the cooling tower and the dust collector are connected by an exhaust gas duct.
  • FIG. 2 is a diagram showing an example of the configuration of the fly ash charging facility in FIG. 21 is a fly ash hopper that receives fly ash collected in the gas treatment process.
  • Reference numeral 22 denotes fly ash metering and supply means for extracting fly ash from the fly ash 21 while measuring the fly ash.
  • a rotary feeder is used.
  • Reference numeral 23 denotes a closed powder carrier such as a screw conveyor.
  • Reference numeral 24 denotes a means for measuring and supplying water for measuring water such as sewage generated in a waste treatment facility.
  • a flow indicator 25 and a valve 26 for setting a flow rate are used. I do.
  • Reference numeral 28 denotes fly ash charging means for charging sludge-like fly ash into the melting furnace 10.
  • a monopump suitable for transporting mud is used. Compressed air is injected at the inlet of sludge-like fly ash, so that sludge-like fly ash is dispersed and loaded in the lower part of the furnace.
  • the fly ash is sludge-shaped so as to prevent fly ash charged into the melting furnace 10 from scattering before reaching the furnace lower part.
  • the moisture content of the resulting fly ash does not have to be strictly controlled. For this reason, the equipment for measuring fly ash and water only needs to be able to measure almost quantitatively.
  • Waste, coke, and limestone are weighed and charged in predetermined quantities.
  • Main wing Air or oxygen-enriched air is blown from the port 14 to burn the coke in the coke layer 50, forming a high-temperature combustion zone at the bottom of the furnace.
  • the waste stays on the coke layer 50 to form a fluidized bed 51, is preheated on the high-temperature coke layer 50, and is thermally decomposed into a combustible gas.
  • the combustible gas is burned by blowing air from the three-stage tuyere 16 into high-temperature gas, discharged from the outlet 12 and sent to the gas treatment process.
  • the fly ash stored in the fly ash hopper 21 is collected by the rotary feeder 22. It is cut out almost quantitatively and supplied to the kneading means (paddle type kneading machine) 27 by the screw conveyor 23.
  • water such as sewage, which has been measured almost quantitatively by the water metering / supplying means 25, is co-supplied to the mixing means 27.
  • the fly ash supplied to the kneading means 27 is kneaded into sludge, and is charged into the melting furnace 10 by the fly ash charging means (monopump) 28. Most of the fly ash charged into the melting furnace 10 falls onto the coke layer 50, melts and flows down together with the waste residue, and is discharged as molten slag.
  • the high-temperature gas discharged from the melting furnace 10 is sent to the boiler 31 for heat recovery.
  • the exhaust gas from the boiler 31 is sprayed with water in a cooling tower 32, cooled rapidly, sent to a dust collector 33 for dust removal, and then emitted through a harmful gas removal device.
  • Fly ash scattered from the melting furnace 10 is collected by the dust collector 33, and the settled ash is also discharged from the boiler 31 and the cooling tower 32 upstream thereof. These fly ash are sent to the fly ash processing equipment 20 and recharged to the melting furnace 10 where they are melted.
  • fly ash The reloading of fly ash is repeated as described above. During this repetition process, in the process in which the fly ash charged into the melting furnace 10 is heated to a high temperature, some of the heavy metal compounds that are relatively easily vaporized in the components in the fly ash vaporize again. . Then, it is discharged together with newly generated fly ash. As a result, fly ash containing concentrated heavy metals is discharged. For this reason, operations to extract only a small amount of the collected fly ash are performed as appropriate. Since this fly ash contains a large amount of heavy metals such as zinc, it can be supplied for use as a raw material for manufacturing non-ferrous metals.
  • FIG. 3 is a diagram showing another example of the configuration of the fly ash charging facility.
  • the fly ash measured by the measuring and supplying means 22 and the water measured by the moisture measuring and supplying means 24 are directly sent to the fly ash charging means 28, and the fly ash and the moisture are removed.
  • the fly ash is charged into the melting furnace 10 while being kneaded in the fly ash charging means 28.
  • compressed air is injected to separate sludge-like fly ash into the lower part of the furnace so that it can be charged.
  • fly ash when fly ash is treated by a waste melting furnace, the fly ash can be melt-processed only by providing a simple pretreatment device that merely makes the fly ash sludge-like.
  • fly ash since fly ash is treated by charging from the upper part of the melting furnace, a desired amount of fly ash can be charged without affecting the high-temperature combustion zone in the lower part of the melting furnace. For this reason, a large amount of fly ash can be treated, and fly ash generated in other waste treatment facilities can be accepted and treated.
  • wastewater such as sewage and sludge can be used as a water source when pre-treating fly ash into sludge. It can also process secondary waste.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Processing Of Solid Wastes (AREA)
  • Treatment Of Sludge (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de traitement de cendres volantes dans un four de fusion de déchets par gazéification pouvant traiter de grandes quantités de cendres volantes sans avoir recours à des dispositifs complexes, ce dispositif fonctionnant simplement pendant le traitement. Les cendres volantes collectées dans un collecteur de poussières, dans une chaudière et dans une colonne de désurchauffe sont introduites dans un appareil de charge, et, au besoin, les cendres volantes produites dans d'autres appareils de traitement de déchets sont reçues et soumises au prétraitement requis avant d'être introduites dans un four de fusion de déchets par gazéification. Dans l'appareil de charge des cendres volantes, les cendres volantes reçues sont incorporées avec de l'eau de manière à les transformer en coulis, les cendres sous forme de coulis ainsi obtenues étant alors chargées dans le four de fusion de déchets par gazéification.
PCT/JP2001/003435 2000-04-28 2001-04-23 Procede et dispositif de traitement de cendres volantes WO2001083126A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000129755A JP2001300470A (ja) 2000-04-28 2000-04-28 廃棄物溶融処理設備における飛灰の処理方法及び装置
JP2000-129755 2000-04-28

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WO2001083126A1 true WO2001083126A1 (fr) 2001-11-08

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107830527A (zh) * 2017-12-04 2018-03-23 大连易舜绿色科技有限公司 废物处理装置及废物处理方法
CN110331007A (zh) * 2019-05-16 2019-10-15 昌鑫生态科技(陕西)有限公司 煤炭气化渣回收利用技术
CN114713592A (zh) * 2022-03-31 2022-07-08 天津华能杨柳青热电有限责任公司 一种利用垃圾焚烧电厂废弃灰渣制取矿物棉的装置和方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4795015B2 (ja) * 2005-12-26 2011-10-19 三菱重工環境・化学エンジニアリング株式会社 飛灰無害化方法及びその装置
JP5014866B2 (ja) * 2007-04-04 2012-08-29 太平洋セメント株式会社 有害物質の処理方法
JP6980591B2 (ja) * 2018-03-28 2021-12-15 三機工業株式会社 汚泥焼却設備及び汚泥焼却方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6191415A (ja) * 1984-10-12 1986-05-09 Nippon Kokan Kk <Nkk> 高炉ダスト処理方法
JPH10300051A (ja) * 1997-04-28 1998-11-13 Takeo Terada 液状有機性汚泥及び焼却灰の同時処理方法
JP2000065334A (ja) * 1998-08-24 2000-03-03 Hitachi Zosen Corp 灰溶融炉用灰加湿供給装置
JP2000117223A (ja) * 1998-10-15 2000-04-25 Nippon Steel Corp 廃棄物溶融処理設備の灰処理方法
JP2000176431A (ja) * 1998-12-16 2000-06-27 Mitsui Eng & Shipbuild Co Ltd 焼却灰の移送方法および処理方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6191415A (ja) * 1984-10-12 1986-05-09 Nippon Kokan Kk <Nkk> 高炉ダスト処理方法
JPH10300051A (ja) * 1997-04-28 1998-11-13 Takeo Terada 液状有機性汚泥及び焼却灰の同時処理方法
JP2000065334A (ja) * 1998-08-24 2000-03-03 Hitachi Zosen Corp 灰溶融炉用灰加湿供給装置
JP2000117223A (ja) * 1998-10-15 2000-04-25 Nippon Steel Corp 廃棄物溶融処理設備の灰処理方法
JP2000176431A (ja) * 1998-12-16 2000-06-27 Mitsui Eng & Shipbuild Co Ltd 焼却灰の移送方法および処理方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107830527A (zh) * 2017-12-04 2018-03-23 大连易舜绿色科技有限公司 废物处理装置及废物处理方法
CN110331007A (zh) * 2019-05-16 2019-10-15 昌鑫生态科技(陕西)有限公司 煤炭气化渣回收利用技术
CN114713592A (zh) * 2022-03-31 2022-07-08 天津华能杨柳青热电有限责任公司 一种利用垃圾焚烧电厂废弃灰渣制取矿物棉的装置和方法
CN114713592B (zh) * 2022-03-31 2023-06-27 天津华能杨柳青热电有限责任公司 一种利用垃圾焚烧电厂废弃灰渣制取矿物棉的装置和方法

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