JPH05256430A - Flying ash processing method and device for waste incinerator - Google Patents

Flying ash processing method and device for waste incinerator

Info

Publication number
JPH05256430A
JPH05256430A JP4299310A JP29931092A JPH05256430A JP H05256430 A JPH05256430 A JP H05256430A JP 4299310 A JP4299310 A JP 4299310A JP 29931092 A JP29931092 A JP 29931092A JP H05256430 A JPH05256430 A JP H05256430A
Authority
JP
Japan
Prior art keywords
exhaust gas
fly ash
refuse incinerator
temperature
conveyor
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.)
Pending
Application number
JP4299310A
Other languages
Japanese (ja)
Inventor
Eiichi Shibuya
榮一 澁谷
Takuro Nomura
卓朗 野村
Takanori Kanamaru
恭教 金丸
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.)
JFE Engineering Corp
Original Assignee
NKK 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 NKK Corp filed Critical NKK Corp
Publication of JPH05256430A publication Critical patent/JPH05256430A/en
Pending legal-status Critical Current

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Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Landscapes

  • Gasification And Melting Of Waste (AREA)
  • Processing Of Solid Wastes (AREA)
  • Air Supply (AREA)

Abstract

PURPOSE:To provide a flying ash processing method for a dust incinerator capable of performing an energy saving and attaining superior processing efficiency. CONSTITUTION:In a flying ash processing method for a waste incinerator for heating flying ash recovered from a waste incinerator and decomposing organic chlorine compound such as dioxine and the like contained in the flying ash, the flying ash transported by a conveyor 3 is directly heated up to the temperature from 350 deg.C to 600 deg.C with discharged gas of high temperature discharged from the incinerator 1.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は、ごみ焼却炉の飛灰処
理方法およびその装置、特に、省エネルギー化が図れ且
つ優れた処理効率が得られる、ごみ焼却炉の飛灰処理方
法およびその装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating fly ash in a refuse incinerator, and more particularly to a method and an apparatus for treating fly ash in a refuse incinerator which can achieve energy saving and excellent treatment efficiency. It is a thing.

【０００２】[0002]

【従来の技術】ごみ焼却炉から回収される飛灰には、ダ
イオキシン等の有害な有機塩素化合物が含まれている。
特開平２-78479号公報には、飛灰を密閉されたコンベア
内で電熱ヒータまたは排ガスによって間接的に飛灰を再
加熱して、飛灰中に含まれる有機塩素化合物を分解して
飛灰を無害化する、ごみ焼却炉の飛灰処理方法（以下、
従来技術という）が開示されている。Fly ash recovered from a refuse incinerator contains harmful organic chlorine compounds such as dioxins.
In Japanese Patent Laid-Open No. 2-78479, fly ash is indirectly reheated by an electric heater or exhaust gas in a conveyor in which the fly ash is sealed, and the fly ash is decomposed to decompose organic chlorine compounds contained in the fly ash. The fly ash treatment method of the refuse incinerator that makes the
Prior art) is disclosed.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、上述し
た従来技術は、飛灰を電熱ヒータによって加熱するの
で、電力を消費するばかりか、電熱ヒータ用の電気設備
が必要となる。一方、飛灰を排ガスによって加熱する方
法は、飛灰を間接的に加熱しているので、飛灰の処理効
率が悪い。However, in the above-mentioned prior art, since fly ash is heated by the electric heater, not only power is consumed but also electric equipment for the electric heater is required. On the other hand, in the method of heating fly ash by the exhaust gas, the fly ash is indirectly heated, so that the fly ash treatment efficiency is poor.

【０００４】従って、この発明の目的は、省エネルギー
化が図れ且つ優れた飛灰処理効率が得られる、ごみ焼却
炉の飛灰処理方法を提供することにある。Therefore, an object of the present invention is to provide a fly ash treatment method for a refuse incinerator, which can save energy and can obtain excellent fly ash treatment efficiency.

【０００５】[0005]

【課題を解決するための手段】この発明は、ごみ焼却炉
から回収される飛灰を加熱して、前記飛灰中に含まれる
ダイオキシン等の有害な有機塩素化合物を分解するごみ
焼却炉の飛灰処理方法において、前記ごみ焼却炉から排
出される高温の排ガスによって前記飛灰を直接、350 か
ら600 ℃の温度に加熱することに特徴を有するものであ
る。The present invention relates to a fly ash of a refuse incinerator which heats fly ash recovered from a refuse incinerator to decompose harmful organic chlorine compounds such as dioxins contained in the fly ash. The ash treatment method is characterized in that the fly ash is directly heated to a temperature of 350 to 600 ° C. by the high temperature exhaust gas discharged from the refuse incinerator.

【０００６】次に、この発明の、ごみ焼却炉の飛灰処理
方法の一実施態様を、図面を参照しながら説明する。Next, an embodiment of the fly ash treatment method for a refuse incinerator according to the present invention will be described with reference to the drawings.

【０００７】図１は、この発明の、ごみ焼却炉の飛灰処
理方法の一実施態様を示す概略断面図、図２は、図１の
Ａ−Ａ線断面図である。FIG. 1 is a schematic sectional view showing an embodiment of a fly ash treatment method for a refuse incinerator according to the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG.

【０００８】図１および図２において、１は、ごみ焼却
炉、２は、ごみ焼却炉１に付設された廃熱ボイラ、３
は、ボイラ２のボイラホッパ2Aの下部に水平に設けられ
たスクリュ−型、あるいは、スクレーパ型等のコンベア
である。コンベア３のボイラホッパ2Aとの接続部分は開
放されている。In FIGS. 1 and 2, 1 is a refuse incinerator, 2 is a waste heat boiler attached to the refuse incinerator 1, and 3 is a waste heat boiler.
Is a screw-type or scraper-type conveyer horizontally provided below the boiler hopper 2A of the boiler 2. The connecting portion of the conveyor 3 with the boiler hopper 2A is open.

【０００９】集塵装置（図示せず）によって回収された
飛灰は、コンベア３の入口3Aからコンベア３内に連続的
に供給される。飛灰は、コンベア３内を移送される過程
で、ボイラ２内を流れる350 から600 ℃の温度の排ガス
によって直接、加熱される。このように再加熱されるこ
とによってダイオキシン等の有害な有機塩素化合物が分
解された飛灰は、出口3Bから排出される。ダイオキシン
等の有害な有機塩素化合物は、350 から600 ℃の温度域
において分解されるが、この化合物は、高温度に加熱さ
れる程、分解され易い。しかし、600 ℃を超える温度の
排ガスは、ハンドリング上好ましくない。Fly ash collected by a dust collector (not shown) is continuously supplied into the conveyor 3 through the inlet 3A of the conveyor 3. Fly ash is directly heated by exhaust gas having a temperature of 350 to 600 ° C. flowing in the boiler 2 while being transferred in the conveyor 3. Fly ash in which harmful organic chlorine compounds such as dioxins are decomposed by being reheated in this manner is discharged from the outlet 3B. Hazardous organochlorine compounds such as dioxins are decomposed in the temperature range of 350 to 600 ° C, but the higher the temperature, the more easily the compounds are decomposed. However, exhaust gas having a temperature exceeding 600 ° C. is not preferable for handling.

【００１０】廃熱ボイラを備えておらず、排ガス冷却装
置を備えているごみ焼却炉の場合には、図３および図３
のＡ−Ａ線断面図である図４に示すように、ごみ焼却炉
１と排ガス冷却装置４との間の排ガスダクト５に、上述
した実施例におけると同様なコンベア６を水平に設け
る。排ガス冷却装置によって排ガス温度を低下させるの
は、次の理由による。即ち、排ガス温度の有効利用を図
るために排ガスは、空気予熱器に送られ、ここで、ごみ
焼却炉の燃焼ガス用空気を予熱するが、排ガス温度が高
すぎると、空気予熱器が損傷するからである。廃熱ボイ
ラが設置されている場合には、ボイラとの熱交換によっ
て排ガス温度が低下するので、排ガス冷却装置を設ける
必要がない。コンベア６の排ガスダクト５との接続部分
は開放されている。これによって飛灰は、コンベア６内
を入口6Aから出口6Bに連続的に移送される過程で、高温
の排ガスによって直接、加熱される。3 and 3 in the case of a refuse incinerator which does not have a waste heat boiler but an exhaust gas cooling device.
As shown in FIG. 4 which is a cross-sectional view taken along the line AA of FIG. 4, an exhaust gas duct 5 between the refuse incinerator 1 and the exhaust gas cooling device 4 is horizontally provided with a conveyor 6 similar to that in the above-described embodiment. The exhaust gas temperature is lowered by the exhaust gas cooling device for the following reasons. That is, in order to effectively utilize the exhaust gas temperature, the exhaust gas is sent to the air preheater, where the air for combustion gas of the refuse incinerator is preheated, but if the exhaust gas temperature is too high, the air preheater is damaged. Because. When the waste heat boiler is installed, the exhaust gas temperature is lowered due to heat exchange with the boiler, so that it is not necessary to provide an exhaust gas cooling device. The connecting portion of the conveyor 6 with the exhaust gas duct 5 is open. As a result, fly ash is directly heated by the high-temperature exhaust gas in the process of being continuously transferred from the inlet 6A to the outlet 6B in the conveyor 6.

【００１１】ごみ焼却炉と排ガス冷却装置とが一体的に
構築されている場合には、図５に示すように、ごみ焼却
炉の排ガスダクト（図示せず）にバイパス７を設け、バ
イパス７に上述した実施例におけると同様なコンベア８
を水平に設ける。コンベア８のバイパス７との接続部分
は開放しておく。これによって飛灰は、コンベア８内を
入口8Aから出口8Bに連続的に移送される過程で、高温の
排ガスによって直接、加熱される。When the refuse incinerator and the exhaust gas cooling device are constructed integrally, a bypass 7 is provided in the exhaust gas duct (not shown) of the refuse incinerator as shown in FIG. Conveyor 8 similar to that in the above embodiment
Is installed horizontally. The connection portion of the conveyor 8 with the bypass 7 is left open. As a result, fly ash is directly heated by the high temperature exhaust gas in the process of being continuously transferred from the inlet 8A to the outlet 8B in the conveyor 8.

【００１２】飛灰の排ガスによる加熱温度は、特に、40
0 〜500 ℃の範囲内が好ましいが、この場合には、ごみ
焼却炉出側の800 〜950 ℃の範囲内の高温度の排ガス温
度を、上記温度範囲内に低下させる必要がある。排ガス
温度をコントロールするには、図６および図７に示すよ
うに、排ガス冷却装置４の排ガス出口下部に上述した実
施例におけると同様なコンベア９を水平に設ければ良
い。これは、排ガス冷却装置４の排ガス温度は、排ガス
冷却装置４内において排ガスに向けて噴射される冷却水
の水量によって自在にコントロールできるからである。The temperature at which fly ash is heated by the exhaust gas is 40
The temperature is preferably in the range of 0 to 500 ° C, but in this case, it is necessary to lower the high temperature exhaust gas temperature in the range of 800 to 950 ° C on the exit side of the refuse incinerator to the above temperature range. In order to control the exhaust gas temperature, as shown in FIGS. 6 and 7, a conveyor 9 similar to that in the above-described embodiment may be horizontally provided below the exhaust gas outlet of the exhaust gas cooling device 4. This is because the exhaust gas temperature of the exhaust gas cooling device 4 can be freely controlled by the amount of the cooling water injected toward the exhaust gas in the exhaust gas cooling device 4.

【００１３】コンベア９の入口9Aからコンベア９内に連
続的に供給された飛灰は、コンベア９内を移送される過
程で、400 〜500 ℃の範囲内に温度コントロールされた
排ガスによって直接、加熱される。このように再加熱さ
れることによってダイオキシン等の有害な有機塩素化合
物が効率良く分解された飛灰は、出口9Bから排出され
る。Fly ash continuously supplied from the inlet 9A of the conveyer 9 into the conveyer 9 is directly heated by exhaust gas whose temperature is controlled in the range of 400 to 500 ° C. in the process of being conveyed in the conveyer 9. To be done. Fly ash in which harmful organic chlorine compounds such as dioxins are efficiently decomposed by being reheated in this manner is discharged from the outlet 9B.

【００１４】表１に、400 〜430 ℃に温度コントロール
された排ガス冷却装置４からの排ガスによって直接、飛
灰を加熱したときの飛灰の成分結果を示す。Table 1 shows the results of the fly ash components when the fly ash is directly heated by the exhaust gas from the exhaust gas cooling device 4 whose temperature is controlled to 400 to 430 ° C.

【００１５】[0015]

【表１】 [Table 1]

【００１６】表１から明らかなように、飛灰中のダイオ
キシンはほぼ完全に分解されていることが分かった。As is clear from Table 1, it was found that the dioxin in the fly ash was almost completely decomposed.

【００１７】[0017]

【発明の効果】以上説明したように、この発明によれ
ば、ごみ焼却炉の排ガスによって飛灰を350 から600 ℃
の温度に加熱するので、省エネルギー化が図れ、しか
も、飛灰を直接、加熱するので優れた飛灰処理効率が得
られるといった有用な効果がもたらされる。As described above, according to the present invention, the fly ash is heated to 350 to 600 ° C. by the exhaust gas from the refuse incinerator.
Since it is heated to this temperature, energy saving can be achieved, and moreover, fly ash is directly heated, so that an excellent effect of fly ash treatment efficiency can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図１】この発明の、ごみ焼却炉の飛灰処理方法の一実
施態様を示す概略断面図である。FIG. 1 is a schematic cross-sectional view showing an embodiment of a fly ash treatment method for a refuse incinerator according to the present invention.

【図２】図１のＡ−Ａ線断面図である。FIG. 2 is a sectional view taken along the line AA of FIG.

【図３】この発明の、ごみ焼却炉の飛灰処理方法の他の
実施態様を示す概略断面図である。FIG. 3 is a schematic cross-sectional view showing another embodiment of the fly ash treatment method for a refuse incinerator according to the present invention.

【図４】図３のＡ−Ａ線断面図である。4 is a cross-sectional view taken along the line AA of FIG.

【図５】この発明の、ごみ焼却炉の飛灰処理方法の更に
別の実施態様を示す概略断面図である。FIG. 5 is a schematic sectional view showing still another embodiment of the fly ash treatment method for a refuse incinerator according to the present invention.

【図６】この発明の、ごみ焼却炉の飛灰処理方法の更に
別の実施態様を示す概略断面図である。FIG. 6 is a schematic sectional view showing still another embodiment of the fly ash treatment method for a refuse incinerator according to the present invention.

【図７】図６のＡ−Ａ線断面図である。7 is a cross-sectional view taken along the line AA of FIG.

【符号の説明】[Explanation of symbols]

１：ごみ焼却炉、 ２：ボイラ、 2A：ボイラホッパ、 ３：コンベア、 3A：コンベア３の入口、 3B：コンベア３の出口、 ４：排ガス冷却装置、 ５：排ガスダクト、 ６：コンベア、 6A：コンベア６の入口、 6B：コンベア６の出口、 ７：バイパス、 ８：コンベア、 8A：コンベア８の入口、 8B：コンベア８の出口、 ９：コンベア、 9A：コンベア９の入口、 9B：コンベア９の出口。 1: Waste incinerator, 2: Boiler, 2A: Boiler hopper, 3: Conveyor, 3A: Conveyor 3 inlet, 3B: Conveyor 3 outlet, 4: Exhaust gas cooling device, 5: Exhaust gas duct, 6: Conveyor, 6A: Conveyor 6 inlet, 6B: conveyor 6 outlet, 7: bypass, 8: conveyor, 8A: conveyor 8 inlet, 8B: conveyor 8 outlet, 9: conveyor, 9A: conveyor 9 inlet, 9B: conveyor 9 outlet .

Claims (6)

【特許請求の範囲】[Claims] 【請求項１】 ごみ焼却炉から回収される飛灰を加熱し
て、前記飛灰中に含まれるダイオキシン等の有害な有機
塩素化合物を分解するごみ焼却炉の飛灰処理方法におい
て、前記ごみ焼却炉から排出される高温の排ガスによっ
て前記飛灰を直接、350 から600 ℃の温度に加熱するこ
とを特徴とする、ごみ焼却炉の飛灰処理方法。1. A method for treating fly ash in a refuse incinerator, which comprises heating fly ash recovered from the refuse incinerator to decompose harmful organic chlorine compounds such as dioxins contained in the fly ash. A method for treating fly ash in a refuse incinerator, characterized in that the fly ash is directly heated to a temperature of 350 to 600 ° C by high-temperature exhaust gas discharged from the furnace. 【請求項２】 前記ごみ焼却炉の排ガス出側に設置され
た廃熱ボイラ内に、前記飛灰を連続的に通過させ、かく
して、前記飛灰を前記ボイラ内を通過する排ガスによっ
て直接、加熱することを特徴とする、請求項１記載の方
法。2. The fly ash is continuously passed through a waste heat boiler installed on the exhaust gas outlet side of the refuse incinerator, and thus the fly ash is directly heated by the exhaust gas passing through the boiler. The method of claim 1, wherein the method comprises: 【請求項３】 前記ごみ焼却炉の排ガス出側に設置され
た排ガス冷却装置と前記ごみ焼却炉との間の排ガスダク
ト内に、前記飛灰を連続的に通過させ、かくして、前記
飛灰を排ガスダクト内を通過する排ガスによって直接、
加熱することを特徴とする、請求項１記載の方法。3. The fly ash is continuously passed through an exhaust gas duct between an exhaust gas cooling device installed on the exhaust gas outlet side of the refuse incinerator and the refuse incinerator, thus removing the fly ash. Directly by the exhaust gas passing through the exhaust gas duct,
The method according to claim 1, wherein the heating is performed. 【請求項４】 前記ごみ焼却炉の排ガス出側に設置され
た排ガス冷却装置と前記ごみ焼却炉との間の排ガスダク
トにバイパスを設け、前記バイパス内に、前記飛灰を連
続的に通過させ、かくして、前記飛灰を前記バイパス内
を通過する排ガスによって直接、加熱することを特徴と
する、請求項１記載の方法。4. A bypass is provided in an exhaust gas duct between the exhaust gas cooling device installed on the exhaust gas outlet side of the refuse incinerator and the refuse incinerator, and the fly ash is continuously passed through the bypass. 3. The method according to claim 1, characterized in that the fly ash is thus heated directly by the exhaust gas passing through the bypass. 【請求項５】 前記ごみ焼却炉の排ガス出側に設置され
た排ガス冷却装置の排ガス出口からの温度コントロール
された排ガスによって前記飛灰を直接、加熱することを
特徴とする、請求項１記載の方法。5. The fly ash is directly heated by the temperature-controlled exhaust gas from an exhaust gas outlet of an exhaust gas cooling device installed on the exhaust gas outlet side of the refuse incinerator. Method. 【請求項６】 ごみ焼却炉から回収される飛灰を加熱し
て、前記飛灰中に含まれるダイオキシン等の有害な有機
塩素化合物を分解するごみ焼却炉の飛灰処理装置におい
て、前記ごみ焼却炉の排ガス出側に設置された排ガス冷
却装置の排ガス出口下部に飛灰搬送用コンベアが設けら
れ、前記コンベアに供給された前記飛灰を、前記排ガス
冷却装置の排ガス出口からの温度コントロールされた排
ガスによって直接、加熱することを特徴とする、ごみ焼
却炉の飛灰処理装置。6. A fly ash treatment device for a refuse incinerator, which heats fly ash recovered from the refuse incinerator to decompose harmful organic chlorine compounds such as dioxins contained in the fly ash. A fly ash transporting conveyor is provided below the exhaust gas outlet of the exhaust gas cooling device installed on the exhaust gas outlet side of the furnace, and the fly ash supplied to the conveyor is temperature controlled from the exhaust gas outlet of the exhaust gas cooling device. A fly ash treatment device for a refuse incinerator, which is characterized by being heated directly by exhaust gas.
JP4299310A 1991-10-21 1992-10-12 Flying ash processing method and device for waste incinerator Pending JPH05256430A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3-301036 1991-10-21
JP30103691 1991-10-21

Publications (1)

Publication Number Publication Date
JPH05256430A true JPH05256430A (en) 1993-10-05

Family

ID=17892084

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4299310A Pending JPH05256430A (en) 1991-10-21 1992-10-12 Flying ash processing method and device for waste incinerator

Country Status (1)

Country Link
JP (1) JPH05256430A (en)

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