JPH0975655A - Highly efficient exhaust gas treatment method in waste melting furnace - Google Patents
Highly efficient exhaust gas treatment method in waste melting furnaceInfo
- Publication number
- JPH0975655A JPH0975655A JP7237948A JP23794895A JPH0975655A JP H0975655 A JPH0975655 A JP H0975655A JP 7237948 A JP7237948 A JP 7237948A JP 23794895 A JP23794895 A JP 23794895A JP H0975655 A JPH0975655 A JP H0975655A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- melting furnace
- gas treatment
- dust
- fly ash
- 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
Links
Landscapes
- Chimneys And Flues (AREA)
- Gasification And Melting Of Waste (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、都市ごみ、産業廃
棄物の焼却灰や下水汚泥等を溶融処理する技術に係り、
廃棄物溶融炉における高効率排ガス処理方法に関する。TECHNICAL FIELD The present invention relates to a technique for melting and treating municipal solid waste, incinerated ash of industrial waste, sewage sludge and the like,
The present invention relates to a highly efficient exhaust gas treatment method in a waste melting furnace.
【０００２】[0002]
【従来の技術】図２に示すように、都市ごみ、産業廃棄
物等の焼却灰や、下水汚泥等を溶融処理する従来のシス
テムにおいて、処理物ホッパー１に貯留する廃棄物は、
直接あるいは溶融助剤ホッパー２から投入する溶融助剤
と共に溶融炉３に投入している。溶融炉３で発生する排
ガスは、熱エネルギーを回収するための廃熱回収部４を
通り、排ガス冷却部５に導入する。排ガス冷却部５にお
いて適当温度にまで冷却した排ガスを排ガス処理部６に
導き、排ガス中の酸性ガスの中和のために、アルカリ剤
［ＮａＯＨ，Ｃａ（ＯＨ）2 等] ７を添加し、その反応
生成物とダストを集塵装置８において捕集除去してい
る。この捕集した溶融飛灰９は埋立処分もしくは山元還
元１０し、集塵装置８を通過した処理ガスはファン１１
を介して煙突１２から大気に放出している。2. Description of the Related Art As shown in FIG. 2, in a conventional system for melting and treating incinerated ash of municipal solid waste, industrial waste, etc., and sewage sludge, the waste stored in the processed hopper 1 is
It is charged into the melting furnace 3 either directly or together with the melting auxiliary agent supplied from the melting auxiliary agent hopper 2. Exhaust gas generated in the melting furnace 3 is introduced into an exhaust gas cooling unit 5 through a waste heat recovery unit 4 for recovering thermal energy. The exhaust gas cooled to an appropriate temperature in the exhaust gas cooling unit 5 is guided to the exhaust gas processing unit 6, and an alkaline agent [NaOH, Ca (OH) 2 etc.] 7 is added to neutralize the acidic gas in the exhaust gas, The reaction product and dust are collected and removed by the dust collector 8. The collected molten fly ash 9 is landfilled or Yamamoto reduced 10, and the processing gas that has passed through the dust collector 8 is a fan 11
It is released to the atmosphere from the chimney 12 via the.
【０００３】[0003]
【発明が解決しようとする課題】上記した構成におい
て、回収した溶融飛灰９を効率良く山元還元するために
は、溶融飛灰中のカルシウム量を低減させることが必要
である。このために、排ガス処理部６においてアルカリ
（ＮａＯＨ）７を添加し、その反応生成物とダストを集
塵装置８において捕集除去しているが、集塵装置８とし
て電気集塵器を使用する場合とバグフィルターを使用す
る場合とを比較すると、電気集塵器ではダスト捕集効果
がバグフィルターに比べて低く、ダイオキシン類の抑制
効果にも問題があった。一方、バグフィルターを使用す
る場合には、ダストの剥離効果を考慮し、排ガス処理に
Ｃａ（ＯＨ）2 を使用するが、カルシウム分は溶融飛灰
からの重金属類回収時に不要物となり、カルシウム分の
増加は回収の効率に悪影響を及ぼすことになる。In the above-mentioned structure, it is necessary to reduce the amount of calcium in the molten fly ash in order to efficiently reduce the recovered molten fly ash 9 at the hillside. For this reason, alkali (NaOH) 7 is added in the exhaust gas treatment section 6 and the reaction product and dust are collected and removed in the dust collector 8, but an electric dust collector is used as the dust collector 8. Comparing the case with the case of using the bag filter, the dust collecting effect of the electrostatic precipitator was lower than that of the bag filter, and there was a problem in the dioxin suppressing effect. On the other hand, when using a bag filter, Ca (OH) 2 is used for exhaust gas treatment in consideration of the dust separation effect, but the calcium content becomes unnecessary when recovering heavy metals from the molten fly ash and the calcium content Will increase the efficiency of collection.
【０００４】本発明は上記した課題を解決するもので、
捕集した溶融飛灰中におけるカルシウム成分量の抑制
と、ダイオキシン類の発生の抑制および捕集を行い、添
加薬剤量の低減を図ることができる廃棄物溶融炉におけ
る高効率排ガス処理方法を提供することを目的とする。The present invention solves the above-mentioned problems, and
A highly efficient exhaust gas treatment method in a waste melting furnace capable of suppressing the amount of calcium components in the collected molten fly ash and suppressing and collecting the generation of dioxins and reducing the amount of added chemicals. The purpose is to
【０００５】[0005]
【課題を解決するための手段】上記した課題を解決する
ために、本発明の廃棄物溶融炉における高効率排ガス処
理方法は、排ガス処理部に廃棄物溶融炉から排出する排
ガスを導いてＮａＯＨを噴霧し、排ガス処理部を通った
排ガスを電気集塵器に導いて溶融飛灰を捕集し、電気集
塵器を通った排ガスに剥離剤および吸着剤を噴霧し、そ
の後にバグフィルターに導いてダストを捕集し、捕集し
たダストを廃棄物溶融炉へ再投入する構成としたもので
ある。In order to solve the above-mentioned problems, a method for highly efficient exhaust gas treatment in a waste melting furnace of the present invention is directed to an exhaust gas treating section for introducing exhaust gas discharged from the waste melting furnace to generate NaOH. The flue gas that has been sprayed and passed through the flue gas treatment section is guided to the electrostatic precipitator to collect the molten fly ash. The dust is collected by using the above method, and the collected dust is reintroduced into the waste melting furnace.
【０００６】上記した構成により、排ガス処理にＮａＯ
Ｈを使用するので、電気集塵器で捕集した溶融飛灰には
余分なカルシウムが含まれず、溶融飛灰を効率良く山元
還元することができる。電気集塵器により大部分の溶融
飛灰を除去した後の排ガスをバグフィルターに導くの
で、バグフィルターの入口におけるダスト負荷は小さく
なる。このため、バグフィルターに小型の型式のものを
使用することができる。また、電気集塵器を通った排ガ
スに噴霧する剥離剤および吸着剤を適宜に調合すること
により、バグフィルターにおいてダイオキシン類を除去
することができる。また、剥離剤および吸着剤はダイオ
キシン類を含むダストとともに廃棄物溶融炉に再投入さ
れるので、剥離剤および吸着剤は適当な薬剤を選定する
ことにより、溶融助剤として作用させることができる。With the above structure, NaO is used for exhaust gas treatment.
Since H is used, the molten fly ash collected by the electrostatic precipitator does not contain excess calcium, and the molten fly ash can be efficiently reduced to the hill. Since the exhaust gas after removing most of the molten fly ash by the electric dust collector is guided to the bag filter, the dust load at the inlet of the bag filter becomes small. Therefore, a small type of bag filter can be used. Further, by appropriately blending a stripping agent and an adsorbent that are sprayed on the exhaust gas that has passed through the electrostatic precipitator, it is possible to remove dioxins in the bag filter. Further, since the stripping agent and the adsorbent are reintroduced into the waste melting furnace together with the dust containing dioxins, the stripping agent and the adsorbent can act as a melting aid by selecting an appropriate chemical.
【０００７】ここで、剥離剤としては、けいそう土、硅
砂、シラス等のＳｉＯ2 系の微粉を使用し、吸着剤とし
ては微粉炭、活性コークス等を使用する。Here, SiO 2 type fine powder such as diatomaceous earth, silica sand and shirasu is used as the stripping agent, and pulverized coal, activated coke and the like are used as the adsorbent.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施形態を図面に
基づいて説明する。図１において、処理物ホッパー２１
から供給する廃棄物は、溶融助剤ホッパー２２から供給
する溶融助剤とともに、溶融炉２３に導いて溶融処理す
る。溶融炉２３において発生する排ガスは、廃熱回収部
２４に導いて熱エネルギーを回収して後に、排ガス冷却
部２５において適当温度にまで冷却する。その後、排ガ
スを排ガス処理部２６に導き、排ガス処理のためにＮａ
ＯＨ２７を噴霧し、排ガス処理部２６を通った排ガスを
小型電気集塵器２８に導いて溶融飛灰２９を捕集する。
捕集した溶融飛灰２９は山元還元３０により処理する。Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG.
The waste material supplied from the above is introduced into the melting furnace 23 together with the melting auxiliary agent supplied from the melting auxiliary agent hopper 22, and is subjected to the melting treatment. The exhaust gas generated in the melting furnace 23 is guided to the waste heat recovery unit 24 to recover the thermal energy, and then cooled to an appropriate temperature in the exhaust gas cooling unit 25. After that, the exhaust gas is guided to the exhaust gas treatment unit 26, and Na is used for exhaust gas treatment.
OH 27 is sprayed, and the exhaust gas that has passed through the exhaust gas processing unit 26 is guided to a small-sized electrostatic precipitator 28 to collect the molten fly ash 29.
The collected molten fly ash 29 is processed by Yamamoto reduction 30.
【０００９】小型電気集塵器２８を通過した排ガスの煤
塵濃度は、０．１ｇ／ｍ3 Ｎ以下とする。この排ガスに
剥離剤および吸着剤３１を噴霧する。剥離剤としては、
けいそう土、硅砂、シラス等のＳｉＯ2 系の微粉を使用
し、吸着剤としては微粉炭活性コークスを使用する。剥
離剤および吸着剤３１を伴った排ガスは、バグフィルタ
ー３２に導かれてダストを捕集される。捕集されたバグ
ダストは溶融炉へ再投入する。バグフィルター３２を通
過した排ガスは、ファン３３および煙突３４を通して大
気に排出する。この排ガスの煤塵濃度は０．０２ｇ／ｍ
3 Ｎとする。The soot concentration of the exhaust gas passing through the small electrostatic precipitator 28 is set to 0.1 g / m 3 N or less. A stripping agent and an adsorbent 31 are sprayed on this exhaust gas. As a release agent,
SiO 2 based fine powder such as diatomaceous earth, silica sand and shirasu is used, and pulverized coal activated coke is used as an adsorbent. The exhaust gas accompanied by the stripping agent and the adsorbent 31 is guided to the bag filter 32 to collect dust. The collected bag dust is re-charged to the melting furnace. The exhaust gas that has passed through the bag filter 32 is discharged to the atmosphere through the fan 33 and the chimney 34. The dust concentration of this exhaust gas is 0.02 g / m
3 N
【００１０】[0010]
【発明の効果】以上述べたように本発明によれば、排ガ
スにＮａＯＨを噴霧し、電気集塵器で溶融飛灰を捕集す
るので、余分なカルシウムを含ない溶融飛灰を山元還元
に供することができる。電気集塵器を通過した排ガスを
バグフィルターに導くことにより、ダスト負荷を低減し
てバグフィルターの小型化を図ることができ、剥離剤お
よび吸着剤を適宜に調合することにより、バグフィルタ
ーにおいてダイオキシン類を除去するとともに、剥離剤
および吸着剤を溶融助剤として作用させることができ
る。As described above, according to the present invention, since the exhaust gas is sprayed with NaOH and the molten fly ash is collected by the electrostatic precipitator, the molten fly ash containing no excess calcium is reduced to Yamamoto. Can be offered. By guiding the exhaust gas that has passed through the electrostatic precipitator to the bag filter, it is possible to reduce the dust load and reduce the size of the bag filter. By appropriately mixing the stripping agent and the adsorbent, it is possible to use the dioxin in the bag filter. In addition to removing the class, the release agent and the adsorbent can act as a melting aid.
【図１】本発明の高効率排ガス処理方法を示すブロック
線図である。FIG. 1 is a block diagram showing a highly efficient exhaust gas treatment method of the present invention.
【図２】従来の排ガス処理方法を示すブロック線図であ
る。FIG. 2 is a block diagram showing a conventional exhaust gas treatment method.
２１ 処理物ホッパー ２２ 溶融助剤ホッパー ２３ 溶融炉 ２４ 廃熱回収部 ２５ 排ガス冷却部 ２６ 排ガス処理部 ２７ ＮａＯＨ ２８ 小型電気集塵器 ２９ 溶融飛灰 ３０ 山元還元 ３１ 剥離剤および吸着剤 ３２ バグフィルター 21 Treated Material Hopper 22 Melting Auxiliary Hopper 23 Melting Furnace 24 Waste Heat Recovery Section 25 Exhaust Gas Cooling Section 26 Exhaust Gas Treatment Section 27 NaOH 28 Small Electrostatic Precipitator 29 Melt Fly Ash 30 Yamamoto Reduction 31 Stripping Agent and Adsorbent 32 Bag Filter
Claims (1)
る排ガスを導いてＮａＯＨを噴霧し、排ガス処理部を通
った排ガスを電気集塵器に導いて溶融飛灰を捕集し、電
気集塵器を通った排ガスに剥離剤および吸着剤を噴霧
し、その後にバグフィルターに導いてダストを捕集し、
捕集したダストを廃棄物溶融炉へ再投入することを特徴
とする廃棄物溶融炉における高効率排ガス処理方法。1. An exhaust gas treatment unit introduces the exhaust gas discharged from the waste melting furnace and sprays NaOH, and the exhaust gas that has passed through the exhaust gas treatment unit is introduced to an electrostatic precipitator to collect molten fly ash and collect electricity. The release agent and adsorbent are sprayed on the exhaust gas that has passed through the dust container, and then it is led to a bag filter to collect the dust,
A highly efficient exhaust gas treatment method in a waste melting furnace, characterized in that the collected dust is recharged to the waste melting furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23794895A JP3385139B2 (en) | 1995-09-18 | 1995-09-18 | High efficiency exhaust gas treatment method in waste melting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23794895A JP3385139B2 (en) | 1995-09-18 | 1995-09-18 | High efficiency exhaust gas treatment method in waste melting furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0975655A true JPH0975655A (en) | 1997-03-25 |
| JP3385139B2 JP3385139B2 (en) | 2003-03-10 |
Family
ID=17022844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23794895A Expired - Fee Related JP3385139B2 (en) | 1995-09-18 | 1995-09-18 | High efficiency exhaust gas treatment method in waste melting furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3385139B2 (en) |
-
1995
- 1995-09-18 JP JP23794895A patent/JP3385139B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3385139B2 (en) | 2003-03-10 |
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