JP2014176807A - Method for treating incineration ash - Google Patents
Method for treating incineration ash Download PDFInfo
- Publication number
- JP2014176807A JP2014176807A JP2013052323A JP2013052323A JP2014176807A JP 2014176807 A JP2014176807 A JP 2014176807A JP 2013052323 A JP2013052323 A JP 2013052323A JP 2013052323 A JP2013052323 A JP 2013052323A JP 2014176807 A JP2014176807 A JP 2014176807A
- Authority
- JP
- Japan
- Prior art keywords
- incineration ash
- ash
- moisture content
- aging treatment
- aging
- 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
Images
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
- Y02E20/14—Combined heat and power generation [CHP]
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
Description
本発明は、廃棄物焼却炉からの焼却灰を無害化処理する焼却灰の処理方法に関する。 The present invention relates to a method for treating incineration ash for detoxifying incineration ash from a waste incinerator.
都市ゴミなどの廃棄物を焼却する廃棄物焼却炉から排出される焼却灰に対して、メタンを主成分とする炭化水素混合ガスを燃料とするガスエンジンからの排ガスを３４０〜５００℃で接触させてエージングするエージング処理工程を実行して、焼却灰に含まれる鉛や六価クロムを無害化する方法が知られている（例えば、特許文献１参照）。
また、廃棄物焼却炉からの焼却灰に対して、水または水蒸気を混合してエージング処理する方法も提案されている（例えば、特許文献２参照）。
Incineration ash discharged from a waste incinerator that incinerates waste such as municipal waste is brought into contact with an exhaust gas from a gas engine fueled with a hydrocarbon mixed gas mainly composed of methane at 340 to 500 ° C. There is known a method of detoxifying lead and hexavalent chromium contained in incineration ash by executing an aging treatment step of aging (see, for example, Patent Document 1).
In addition, a method has been proposed in which water or steam is mixed with an incineration ash from a waste incinerator to perform an aging treatment (see, for example, Patent Document 2).
上記特許文献１に記載の処理方法は、ガスエンジンから排出される排ガスが、その排ガスの温度および二酸化炭素と酸素の含有量などにおいて、廃棄物焼却炉から排出される排ガスに比べて非常に安定している点に着目し、ガスエンジンからの排ガスにより焼却灰をエージングすることで、焼却灰に含まれる鉛や六価クロムを安定的に処理するために提案されたものである。
しかしながら、当該処理方法では、廃棄物焼却炉から排出される焼却灰の含水率にまでは言及していない。つまり、焼却灰の含水率がエージング処理効果に及ぼす影響については何の記載も示唆もない。
この点に関しては上記特許文献２の処理方法も同様で、焼却灰に水または水蒸気を混合してエージング処理する旨の記載はあるが、焼却灰の含水率がエージング処理効果に及ぼす影響にまで言及したものではない。
In the treatment method described in Patent Document 1, the exhaust gas discharged from the gas engine is very stable compared to the exhaust gas discharged from the waste incinerator in terms of the temperature of the exhaust gas and the contents of carbon dioxide and oxygen. It is proposed to stably treat lead and hexavalent chromium contained in the incineration ash by aging the incineration ash with the exhaust gas from the gas engine.
However, this treatment method does not mention the moisture content of the incinerated ash discharged from the waste incinerator. That is, there is no description or suggestion about the influence of the moisture content of incinerated ash on the aging treatment effect.
Regarding this point, the treatment method of Patent Document 2 is the same, and there is a description that water or steam is mixed with incineration ash to perform an aging treatment, but reference is made to the influence of the moisture content of the incineration ash on the aging treatment effect. It was n’t.
本発明は、焼却灰の含水率がエージング処理効果に及ぼす影響に着目し、種々の試験や実験を行った結果に基づくもので、その目的は、焼却灰に含まれる鉛と六価クロムを確実に無害化することのできる焼却灰の処理方法を提供することにある。 The present invention focuses on the influence of the moisture content of incineration ash on the effect of aging treatment, and is based on the results of various tests and experiments. Its purpose is to ensure the lead and hexavalent chromium contained in the incineration ash. An object of the present invention is to provide a method for treating incinerated ash that can be rendered harmless.
上記目的を達成するための本発明による焼却灰の処理方法は、廃棄物焼却炉からの焼却灰を無害化処理する焼却灰の処理方法であって、
その特徴構成は、前記焼却灰の含水率を１０〜２０％にし、当該焼却灰に対して、メタンを主成分とする炭化水素混合ガスを燃料とするガスエンジンからの排ガスを３４０〜５００℃で接触させてエージングするエージング処理工程を実行して、前記焼却灰に含まれる鉛と六価クロムを無害化する点にある。
The method for treating incineration ash according to the present invention for achieving the above object is a method for treating incineration ash for detoxifying incineration ash from a waste incinerator,
The characteristic configuration is that the moisture content of the incinerated ash is 10 to 20%, and the exhaust gas from a gas engine using a mixed gas of hydrocarbons mainly composed of methane as fuel for the incinerated ash is 340 to 500 ° C. It is in the point which renders harmless the lead and hexavalent chromium which are contained in the incineration ash by executing an aging treatment step of aging by contact.
上記特徴構成によれば、焼却灰の含水率を１０〜２０％にし、その焼却灰に対してガスエンジンからの排ガスを３４０〜５００℃で接触させてエージング処理するので、後述する試験結果などから明らかなように、鉛と六価クロムの溶出量が抑制され、環境庁告示４６号に定められた基準値、つまり、鉛＝０．０１ｍｇ／Ｌ以下、六価クロム＝０．０５ｍｇ／Ｌ以下の基準値以下にまで無害化することが可能となる。 According to the above characteristic configuration, the moisture content of the incineration ash is set to 10 to 20%, and the exhaust gas from the gas engine is brought into contact with the incineration ash at 340 to 500 ° C. so that the aging treatment is performed. As is apparent, the elution amount of lead and hexavalent chromium is suppressed, and the standard values set forth in Notification No. 46 of the Environment Agency, that is, lead = 0.01 mg / L or less, hexavalent chromium = 0.05 mg / L or less It is possible to detoxify to below the standard value.
本発明による焼却灰の処理方法の更なる特徴構成は、前記焼却灰の含水率が２０％を超える湿潤焼却灰の場合、当該湿潤焼却灰を乾燥させて含水率を１０〜２０％に調整する乾燥工程を実行したのち、前記エージング処理工程を実行し、
前記焼却灰の含水率が１０〜２０％の場合、当該焼却灰に対してそのまま前記エージング処理工程を実行する点にある。
A further characteristic configuration of the method for treating incineration ash according to the present invention is that when the moisture content of the incineration ash exceeds 20%, the wet incineration ash is dried to adjust the moisture content to 10 to 20%. After performing the drying process, execute the aging process,
When the moisture content of the incineration ash is 10 to 20%, the aging treatment process is directly performed on the incineration ash.
上記特徴構成によれば、焼却灰の含水率が１０〜２０％の場合は勿論のこと、含水率が２０％を超える湿潤焼却灰の場合には、湿潤焼却灰を乾燥させて含水率を１０〜２０％に調整したのちにエージング処理工程を実行するので、いずれの場合にも、鉛と六価クロムの溶出量を環境庁告示４６号に定められた基準値以下にまで抑制することができる。 According to the above-described characteristic configuration, when the moisture content of the incinerated ash is 10 to 20%, in the case of wet incinerated ash with a moisture content exceeding 20%, the wet incinerated ash is dried to obtain a moisture content of 10%. Since the aging process is performed after adjusting to -20%, in any case, the elution amount of lead and hexavalent chromium can be suppressed to below the reference value stipulated in Environment Agency Notification No. 46. .
本発明による焼却灰の処理方法の更なる特徴構成は、前記焼却灰の含水率が１０％未満の乾燥焼却灰の場合、当該乾燥焼却灰にシャワリングをして含水率を１０〜２０％に調整する湿潤工程を実行したのち、前記エージング処理工程を実行する点にある。 A further characteristic configuration of the method for treating incineration ash according to the present invention is that when the incinerated ash has a moisture content of less than 10%, the incinerated ash is showered to give a moisture content of 10 to 20%. After performing the adjusting wet process, the aging process is performed.
上記特徴構成によれば、含水率が１０％未満の乾燥焼却灰の場合には、乾燥焼却灰にシャワリングをして含水率を１０〜２０％に調整したのちにエージング処理工程を実行するので、たとえ含水率が１０％未満の乾燥焼却灰であっても、鉛と六価クロムの溶出量を環境庁告示４６号に定められた基準値以下にまで抑制することができる。 According to the above characteristic configuration, in the case of dry incineration ash having a moisture content of less than 10%, the aging treatment process is performed after the dry incineration ash is showered to adjust the moisture content to 10 to 20%. Even if it is dry incinerated ash with a water content of less than 10%, the elution amount of lead and hexavalent chromium can be suppressed to below the standard value stipulated in Notification No. 46 of the Environment Agency.
本発明による焼却灰の処理方法の更なる特徴構成は、前記焼却灰の含水率が１０％未満の乾燥焼却灰の場合、当該乾燥焼却灰にシャワリングをして含水率を１０〜２０％に調整する湿潤工程を実行したのち、前記エージング処理工程を実行し、
前記焼却灰の含水率が１０〜２０％の場合、当該焼却灰に対してそのまま前記エージング処理工程を実行する点にある。
A further characteristic configuration of the method for treating incineration ash according to the present invention is that when the incinerated ash has a moisture content of less than 10%, the incinerated ash is showered to give a moisture content of 10 to 20%. After performing the wet process to be adjusted, execute the aging process step,
When the moisture content of the incineration ash is 10 to 20%, the aging treatment process is directly performed on the incineration ash.
上記特徴構成によれば、焼却灰の含水率が１０〜２０％の場合は勿論のこと、含水率が１０％未満の乾燥焼却灰の場合には、乾燥焼却灰にシャワリングをして含水率を１０〜２０％に調整したのちにエージング処理工程を実行するので、いずれの場合にも、鉛と六価クロムの溶出量を環境庁告示４６号に定められた基準値以下にまで抑制することができる。 According to the above characteristic configuration, the moisture content of the incinerated ash is of course 10-20%, and in the case of the dry incinerated ash having a moisture content of less than 10%, the moisture content is shown by showering the dried incinerated ash. Since the aging process is performed after adjusting to 10 to 20%, the elution amount of lead and hexavalent chromium should be controlled below the standard value stipulated in Environment Agency Notification No. 46 in each case. Can do.
本発明による焼却灰の処理方法の更なる特徴構成は、前記エージング処理工程をロータリーキルン装置により実行し、当該ロータリーキルン装置内において上流側から下流側へ向けて移動する前記焼却灰に対し、逆に下流側から上流側へ通流する排ガスを対向接触させてエージングする点にある。 A further characteristic configuration of the method for treating incineration ash according to the present invention is that the aging treatment step is performed by a rotary kiln device, and the downstream side is opposite to the incineration ash moving from the upstream side to the downstream side in the rotary kiln device. The exhaust gas flowing from the side to the upstream side is brought into contact with each other and aged.
上記特徴構成によれば、ロータリーキルン装置内において上流側から下流側へ向けて移動する焼却灰に対し、逆に下流側から上流側へ通流する排ガスを対向接触させてエージングするので、エージング処理を促進してエージング処理に要する時間の短縮を図るとともに、エージング効果の向上を図ることができる。 According to the above characteristic configuration, the incineration ash that moves from the upstream side toward the downstream side in the rotary kiln device is aged against the exhaust gas flowing from the downstream side to the upstream side, so that the aging process is performed. It is possible to promote the reduction of the time required for the aging process and to improve the aging effect.
本発明による焼却灰の処理方法の実施形態を図面に基づいて説明する。
この焼却灰の処理方法は、例えば、都市ゴミなどの廃棄物を焼却する廃棄物焼却炉から排出される焼却灰を対象とし、当該焼却灰に含まれる鉛と六価クロムを環境庁告示４６号（溶出量試験：鉛＝０．０１ｍｇ／Ｌ以下、六価クロム＝０．０５ｍｇ／Ｌ以下）に定められた基準値以下にまで無害化するためのものである。
当該処理方法の実施に使用する焼却灰の処理装置は、例えば、図１に示すように、第１〜第３までの３基の保管用ホッパー２、３、４を備え、これら保管用ホッパー２、３、４には、廃棄物焼却炉１から排出された焼却灰から分級装置（図示せず）などにより比較的大きな異物（乾電池など）が取り除かれた状態で、その焼却灰が一時的に保管される。
An embodiment of a method for treating incinerated ash according to the present invention will be described with reference to the drawings.
This incineration ash treatment method targets, for example, incineration ash discharged from a waste incinerator that incinerates waste such as municipal waste. Lead and hexavalent chromium contained in the incineration ash are notified by the Environment Agency Notification No. 46. (Elution amount test: lead = 0.01 mg / L or less, hexavalent chromium = 0.05 mg / L or less) It is for detoxifying to below the reference value defined.
The incineration ash treatment apparatus used for carrying out the treatment method includes, for example, three storage hoppers 2, 3, and 4 as shown in FIG. 1, and these storage hoppers 2. 3, 4, the incineration ash is temporarily removed from the incineration ash discharged from the waste incinerator 1 with relatively large foreign objects (such as dry cells) removed by a classifier (not shown). Stored.
各保管用ホッパー２、３、４からの焼却灰をエージング処理するのがロータリーキルン装置５で、当該ロータリーキルン装置５は、上流側（図面の左側）が高く、下流側（図面の右側）が低くなるように傾斜がつけられ、その内部には回転する多数の撹拌羽を備えていて、保管用ホッパー２、３、４からの焼却灰が、図中実線で示すように、上流側から下流側へ向けて移動搬送される。当該ロータリーキルン装置５に対して、例えば、第１保管用ホッパー２からの搬送路には焼却灰を乾燥させる乾燥機６が設けられ、第３保管用ホッパー４からの搬送路には焼却灰に水や水蒸気などをシャワリングするシャワリング装置７が設けられる。
焼却灰のエージングに使用されるのはガスエンジン８からの排ガスで、当該ガスエンジン８は、メタンを主成分とする炭化水素混合ガスを燃料とし、例えば、別途需要のある熱と電力を供給することのできるコジェネレーション設備の一角を担うものである。当該コジェネレーション設備からの電力によって、上述したロータリーキルン装置５、乾燥機６、シャワリング装置７なども駆動される。
The rotary kiln device 5 ages the incinerated ash from the storage hoppers 2, 3, and 4. The rotary kiln device 5 has a high upstream side (left side in the drawing) and a low downstream side (right side in the drawing). The incineration ash from the storage hoppers 2, 3, 4 moves from the upstream side to the downstream side as indicated by the solid line in the figure. It is moved and conveyed. For the rotary kiln device 5, for example, a dryer 6 for drying the incineration ash is provided on the conveyance path from the first storage hopper 2, and water is supplied to the incineration ash on the conveyance path from the third storage hopper 4. A showering device 7 is provided for showering water and water vapor.
The exhaust gas from the gas engine 8 is used for the aging of the incineration ash, and the gas engine 8 uses a hydrocarbon mixed gas mainly composed of methane as a fuel, for example, to supply heat and electric power that are separately in demand. It is one of the cogeneration facilities that can be used. The above-described rotary kiln device 5, dryer 6, showering device 7 and the like are driven by the electric power from the cogeneration facility.
コジェネレーション設備で使用されるガスエンジン８は、理論空気比よりも薄い混合気（例えば、空気比１．６〜２．１程度）で運転することにより、リーンバーン状態となって燃費効率の良い状態で運転され、また、実質的に理論空燃比（例えば、空気比０．９５〜１．０５程度）で運転することにより、ストイキ状態で運転される。
なお、実際に稼働しているガスエンジン８について調べたところ、リーンバーン状態での運転時には、排ガス中に二酸化炭素を５．２〜６．７体積％、酸素を８〜１１体積％程度含有し、ストイキ状態での運転時には、二酸化炭素を９〜１１体積％程度含有し、酸素については含有していないことが判明した。
The gas engine 8 used in the cogeneration facility operates in a lean air-fuel mixture (for example, an air ratio of about 1.6 to 2.1) that is leaner than the theoretical air ratio. It is operated in a stoichiometric state by operating at a stoichiometric air-fuel ratio (for example, an air ratio of about 0.95 to 1.05).
In addition, when the gas engine 8 actually operating was examined, when operating in the lean burn state, the exhaust gas contained about 5.2 to 6.7% by volume of carbon dioxide and about 8 to 11% by volume of oxygen. During operation in the stoichiometric state, it was found that about 9 to 11% by volume of carbon dioxide was contained and oxygen was not contained.
このガスエンジン８から排出される排ガスの温度を温度調整機構９によって３４０〜５００℃に調整して、ロータリーキルン装置５の下流側に供給し、図中破線で示すように、下流側から上流側へ向けて通流する。
つまり、ロータリーキルン装置５内において、上流側から下流側へ移動搬送される焼却灰に対し、ガスエンジン８からの排ガスを３４０〜５００℃に調温した状態で、逆に下流側から上流側へ向けて通流させて接触させ、それによって焼却灰をエージングし、焼却灰に含まれる鉛と六価クロムを無害化する。
そして、無害化したのちの焼却灰は、処理済みホッパー１０に保管され、エージングに供されたのちの排ガスは、冷却塔１１により冷却され、集塵器１２により集塵されて装置外へ排気される。
なお、温度調整機構９として、ガスエンジン８からの排ガスを積極的に冷却または加熱する温度調整装置を使用し得るのは勿論のこと、排ガスを冷却する場合、ガスエンジン８からの排ガスをロータリーキルン装置５へ搬送するための排ガス用配管を温度調整機構９として使用することもできる。
The temperature of the exhaust gas discharged from the gas engine 8 is adjusted to 340 to 500 ° C. by the temperature adjusting mechanism 9 and supplied to the downstream side of the rotary kiln device 5, and from the downstream side to the upstream side as indicated by the broken line in the figure. It flows toward.
That is, in the rotary kiln device 5, the exhaust gas from the gas engine 8 is temperature-controlled at 340 to 500 ° C. with respect to the incinerated ash moved and conveyed from the upstream side to the downstream side, and conversely from the downstream side to the upstream side. The incinerated ash is aged to detoxify lead and hexavalent chromium contained in the incinerated ash.
The incinerated ash after detoxification is stored in the treated
It should be noted that a temperature adjusting device that actively cools or heats the exhaust gas from the gas engine 8 can be used as the temperature adjustment mechanism 9, and when exhaust gas is cooled, the exhaust gas from the gas engine 8 is removed from the rotary kiln device. The exhaust gas piping for transporting to 5 can also be used as the temperature adjusting mechanism 9.
つぎに、上述した焼却灰の処理装置を使用して、焼却灰に含まれる鉛と六価クロムを無害化する焼却灰の処理方法について説明する。
廃棄物焼却炉１から排出された焼却灰は、焼却灰の含水率に応じて、第１〜第３保管用ホッパー２、３、４のいずれかに保管される。例えば、焼却灰の含水率が２０％を超える湿潤状態の焼却灰であれば、第１保管用ホッパー２に保管され、その湿潤焼却灰を乾燥機６により乾燥させて含水率を１０〜２０％に調整する乾燥工程を実行したのち、ロータリーキルン装置５へ搬送する。
焼却灰の含水率が１０〜２０％であれば、第２保管用ホッパー３に保管され、そのままロータリーキルン装置５へ搬送する。また、焼却灰の含水率が１０％未満の乾燥状態の焼却灰であれば、第３保管用ホッパー４に保管され、その乾燥焼却灰をシャワリング装置７により湿潤させて含水率を１０〜２０％に調整する湿潤工程を実行したのち、ロータリーキルン装置５へ搬送する。
Next, an incineration ash treatment method for detoxifying lead and hexavalent chromium contained in the incineration ash using the above-described incineration ash treatment apparatus will be described.
The incineration ash discharged from the waste incinerator 1 is stored in one of the first to third storage hoppers 2, 3 and 4 according to the moisture content of the incineration ash. For example, if the incinerated ash has a moisture content exceeding 20%, the incinerated ash is stored in the first storage hopper 2, and the wet incinerated ash is dried by the dryer 6 so that the moisture content is 10 to 20%. After carrying out the drying process to be adjusted to, it is transported to the rotary kiln device 5.
If the moisture content of the incinerated ash is 10 to 20%, it is stored in the second storage hopper 3 and is conveyed to the rotary kiln device 5 as it is. In addition, if the incinerated ash has a moisture content of less than 10%, it is stored in the third storage hopper 4, and the dried incinerated ash is moistened by the showering device 7 so that the moisture content is 10-20. After carrying out the wetting process of adjusting to%, it is conveyed to the rotary kiln device 5.
いずれの場合においても、廃棄物焼却炉１から排出された焼却灰は、その含水率が１０〜２０％に調整されてロータリーキルン装置５へ搬送される。
そして、当該ロータリーキルン装置５内において、上流側から下流側へ移動搬送される含水率が１０〜２０％の焼却灰に対し、逆に下流側から上流側へ通流する排ガスを接触させて、つまり、メタンを主成分とする炭化水素混合ガスを燃料とするガスエンジン８からの排ガスを３４０〜５００℃で接触させてエージングするエージング処理工程が実行され、その結果、焼却灰に含まれる鉛と六価クロムが無害化される。
In any case, the incinerated ash discharged from the waste incinerator 1 is transported to the rotary kiln device 5 with its moisture content adjusted to 10 to 20%.
And in the rotary kiln device 5, the exhaust gas flowing from the downstream side to the upstream side is brought into contact with the incinerated ash having a moisture content of 10 to 20% transferred from the upstream side to the downstream side, that is, Then, an aging treatment step is performed in which the exhaust gas from the gas engine 8 fueled with a hydrocarbon mixed gas mainly containing methane is brought into contact at 340 to 500 ° C., and as a result, lead and six contained in the incinerated ash Valuable chromium is rendered harmless.
本発明による焼却灰の処理方法の効果確認、つまり、鉛と六価クロムの無害化に関する効果確認のため、本発明者らは種々の実験や試験を行ったので、その結果の一部について説明する。
下記の表１は、環境庁告示４６号（溶出量試験：鉛＝０．０１ｍｇ／Ｌ以下、六価クロム＝０．０５ｍｇ／Ｌ以下）による鉛の溶出量試験に関し、焼却灰の含水率に起因する鉛の溶出量の差異を試験したときの結果である。
試験に使用した焼却灰は、未処理の状態で鉛の溶出量が０．５２ｍｇ／Ｌの焼却灰で、使用した排ガスは、二酸化炭素（ＣＯ2）が５体積％、酸素（Ｏ2）が１０体積％、その他が窒素（Ｎ2）バランスの４００℃の排ガスである。そして、焼却灰条件（焼却灰の含水率）を変えながら、ロータリーキルン装置を使用してそれぞれエージング処理工程を６０分実行したのちの鉛の溶出量を分析した結果であり、試験は各条件につき２回（Ｎ＝１とＮ＝２）ずつ行った。
In order to confirm the effect of the method for treating incinerated ash according to the present invention, that is, to confirm the effect on detoxification of lead and hexavalent chromium, the present inventors conducted various experiments and tests, and some of the results are explained. To do.
Table 1 below shows the moisture content of incinerated ash for the lead elution test according to Notification 46 of the Environment Agency (elution test: lead = 0.01 mg / L or less, hexavalent chromium = 0.05 mg / L or less). It is a result when testing the difference in the amount of lead elution caused.
The incineration ash used in the test is incineration ash in an untreated state with a lead elution amount of 0.52 mg / L. The exhaust gas used is 5% by volume of carbon dioxide (CO 2 ) and oxygen (O 2 ). The exhaust gas at 400 ° C. is 10% by volume and the other is nitrogen (N 2 ) balance. And it is the result of analyzing the amount of lead elution after performing the aging process step for 60 minutes using a rotary kiln device while changing the incineration ash conditions (moisture content of incineration ash). Each time (N = 1 and N = 2).
この表１の試験結果から、焼却灰の含水率が１０〜２０％であれば、鉛の溶出量は０．００５ｍｇ／Ｌ以下となり、環境庁告示４６号の０．０１ｍｇ／Ｌ以下の基準値を満たすことが確認できる。特に、含水率０体積％の乾燥焼却灰の場合、そのままエージング処理工程を実行しても、鉛の溶出量が０．０１３ｍｇ／Ｌ（Ｎ＝２参照）であったものが、含水率を１０〜２０％に調整することで０．００５ｍｇ／Ｌ以下となり、この点からも、エージング処理効果に対する含水率の影響の大きさがうかがえる。
ただし、含水率が３０％を超えると、ロータリーキルン装置内の温度が低下して、十分なエージング処理効果を得られないことも判明した。
また、焼却灰の含水率が１０〜２０％であれば、六価クロムの溶出量はいずれも０．０４ｍｇ／Ｌ以下で、環境庁告示４６号の０．０５ｍｇ／Ｌ以下の基準値も満たしていた。
また、他の実験から、焼却灰の含水率を１０〜２０％に調整してエージングする場合、排ガスの温度は３４０〜５００℃が適切で、３４０℃未満であると、鉛の溶出量が環境庁告示４６号の基準値を上回ることがあり、５００℃を超えると、六価クロムの溶出量が環境庁告示４６号の基準値を上回る可能性があることも判明した。
以上の結果から、焼却灰の含水率を１０〜２０％にし、当該焼却灰に対して、メタンを主成分とする炭化水素混合ガスを燃料とするガスエンジンからの排ガスを３４０〜５００℃で接触させてエージング処理工程を実行することによって、焼却灰に含まれる鉛と六価クロムの溶出量を環境庁告示４６号に定められた基準値以下に無害化できることが明らかとなった。
From the test results in Table 1, if the water content of the incinerated ash is 10 to 20%, the lead elution amount is 0.005 mg / L or less, and the standard value of 0.01 mg / L or less in the Environmental Agency Notification No. 46 Can be confirmed. In particular, in the case of dry incineration ash having a water content of 0% by volume, even if the aging treatment process is performed as it is, the lead elution amount was 0.013 mg / L (see N = 2), but the water content was 10%. By adjusting to -20%, it becomes 0.005 mg / L or less, and also from this point, the magnitude of the influence of the moisture content on the aging treatment effect can be seen.
However, it has also been found that when the moisture content exceeds 30%, the temperature in the rotary kiln apparatus decreases and a sufficient aging treatment effect cannot be obtained.
In addition, if the water content of incinerated ash is 10 to 20%, the elution amount of hexavalent chromium is 0.04 mg / L or less, which satisfies the standard value of 0.05 mg / L or less of Environment Agency Notification No. 46. It was.
Moreover, when adjusting the moisture content of incineration ash to 10 to 20% and aging from other experiments, when the temperature of exhaust gas is appropriately 340 to 500 ° C. and less than 340 ° C., the amount of lead elution is the environment It has also been found that it may exceed the standard value of Agency Notification No. 46, and if it exceeds 500 ° C, the elution amount of hexavalent chromium may exceed the standard value of Environment Agency Notification No. 46.
From the above results, the moisture content of the incineration ash is 10 to 20%, and the incineration ash is contacted with the exhaust gas from the gas engine using the hydrocarbon mixed gas mainly composed of methane at 340 to 500 ° C. By performing the aging treatment step, it became clear that the amount of lead and hexavalent chromium contained in the incineration ash can be made harmless below the standard value set in Notification No. 46 of the Environment Agency.
なお、先の実施形態では、発明の内容を容易にするため、第１から第３までの３基の保管用ホッパー２、３、４を設け、各保管用ホッパー２、３、４にそれぞれ含水率の異なる焼却灰が保管されている例を示した。
しかし、実施に際しては、例えば、保管用ホッパーを１基だけ設け、当該保管用ホッパーからロータリーキルン装置５へ至るまでの焼却灰用の搬送路に乾燥機６とシャワリング装置７を設け、焼却灰の含水率が２０％を超える場合、乾燥機６を作動しシャワリング装置７を作動停止して乾燥させ、含水率が１０％未満の場合、乾燥機６を作動停止しシャワリング装置７を作動して湿潤させ、また、含水率が１０〜２０％の場合、そのままロータリーキルン装置５へ搬送するように構成するなど、実際の実施に即した種々の構成を採用することができる。
また、エージング処理工程は、ロータリーキルン装置５以外の各種の装置を使用して実行することも可能であり、その場合、焼却灰と排ガスは必ずしも対向接触させるとは限らない。
In the previous embodiment, in order to facilitate the contents of the invention, the first to third storage hoppers 2, 3, 4 are provided, and each storage hopper 2, 3, 4 contains water. An example is shown in which incinerated ash with different rates is stored.
However, in the implementation, for example, only one storage hopper is provided, and a dryer 6 and a showering device 7 are provided in the incineration ash conveyance path from the storage hopper to the rotary kiln device 5, and When the moisture content exceeds 20%, the dryer 6 is activated and the showering device 7 is deactivated and dried. When the moisture content is less than 10%, the dryer 6 is deactivated and the showering device 7 is activated. When the moisture content is 10 to 20%, various configurations according to the actual implementation can be adopted, such as a configuration in which the moisture content is conveyed to the rotary kiln device 5 as it is.
In addition, the aging treatment step can be performed using various devices other than the rotary kiln device 5, and in that case, the incineration ash and the exhaust gas are not necessarily brought into contact with each other.
１ 廃棄物焼却炉
５ ロータリーキルン装置
６ 乾燥機
７ シャワリング装置
８ ガスエンジン
９ 温度調整機構
1 Waste incinerator 5 Rotary kiln device 6 Dryer 7 Showering device 8 Gas engine 9 Temperature control mechanism
Claims (5)
前記焼却灰の含水率を１０〜２０％にし、当該焼却灰に対して、メタンを主成分とする炭化水素混合ガスを燃料とするガスエンジンからの排ガスを３４０〜５００℃で接触させてエージングするエージング処理工程を実行して、前記焼却灰に含まれる鉛と六価クロムを無害化する焼却灰の処理方法。 An incineration ash treatment method for detoxifying incineration ash from a waste incinerator,
The moisture content of the incinerated ash is 10 to 20%, and the incinerated ash is aged by contacting exhaust gas from a gas engine using a hydrocarbon mixed gas containing methane as a main component at 340 to 500 ° C. A method for treating incineration ash by executing an aging treatment step and detoxifying lead and hexavalent chromium contained in the incineration ash.
前記焼却灰の含水率が１０〜２０％の場合、当該焼却灰に対してそのまま前記エージング処理工程を実行する請求項１に記載の焼却灰の処理方法。 In the case of wet incineration ash with a moisture content of the incineration ash exceeding 20%, after performing the drying step of drying the wet incineration ash and adjusting the moisture content to 10 to 20%, the aging treatment step is performed,
The processing method of the incineration ash of Claim 1 which performs the said aging process process as it is with respect to the said incineration ash, when the moisture content of the said incineration ash is 10-20%.
前記焼却灰の含水率が１０〜２０％の場合、当該焼却灰に対してそのまま前記エージング処理工程を実行する請求項１に記載の焼却灰の処理方法。 In the case of dry incineration ash having a water content of less than 10%, the incineration ash is subjected to a wetting process in which the dry incineration ash is showered to adjust the water content to 10 to 20%, and then the aging treatment process is executed. And
The processing method of the incineration ash of Claim 1 which performs the said aging process process as it is with respect to the said incineration ash, when the moisture content of the said incineration ash is 10-20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013052323A JP6356384B2 (en) | 2013-03-14 | 2013-03-14 | Detoxification method for incineration ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013052323A JP6356384B2 (en) | 2013-03-14 | 2013-03-14 | Detoxification method for incineration ash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2014176807A true JP2014176807A (en) | 2014-09-25 |
| JP6356384B2 JP6356384B2 (en) | 2018-07-11 |
Family
ID=51697340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2013052323A Active JP6356384B2 (en) | 2013-03-14 | 2013-03-14 | Detoxification method for incineration ash |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6356384B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016165713A (en) * | 2015-03-05 | 2016-09-15 | 大阪瓦斯株式会社 | Treatment method and treatment apparatus of incineration ash |
| JP2020192522A (en) * | 2019-05-24 | 2020-12-03 | 株式会社タクマ | Incinerated ash processing device and incinerated ash processing method |
| JP2021030121A (en) * | 2019-08-20 | 2021-03-01 | 株式会社タクマ | Incinerated ash treatment apparatus and incinerated ash treatment method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5787880A (en) * | 1980-11-19 | 1982-06-01 | Nippon Steel Corp | Prevention for heavy metal elution of dusts of waste incineration treatment |
| JP2003126807A (en) * | 2001-10-29 | 2003-05-07 | Takuma Co Ltd | Incineration ash treatment device |
| US20030206850A1 (en) * | 1999-01-21 | 2003-11-06 | Christoph Schultheiss | Method and apparatus for processing ashes of incinerator plants |
| JP2003340397A (en) * | 2002-05-28 | 2003-12-02 | Jfe Engineering Kk | Detoxifying treatment method for waste incineration ash and waste incineration equipment |
| JP2004074100A (en) * | 2002-08-22 | 2004-03-11 | Kobe Steel Ltd | Method of treating incineration ash |
| JP2005125210A (en) * | 2003-10-22 | 2005-05-19 | Kurita Water Ind Ltd | Treatment method for incineration main ash |
| JP2006223987A (en) * | 2005-02-17 | 2006-08-31 | Takuma Co Ltd | Reforming treatment method for incineration ash and incineration ash reforming mechanical stoker type incinerator |
| JP2012170907A (en) * | 2011-02-22 | 2012-09-10 | Osaka Gas Co Ltd | Treatment method and treatment equipment for incineration ash |
-
2013
- 2013-03-14 JP JP2013052323A patent/JP6356384B2/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5787880A (en) * | 1980-11-19 | 1982-06-01 | Nippon Steel Corp | Prevention for heavy metal elution of dusts of waste incineration treatment |
| US20030206850A1 (en) * | 1999-01-21 | 2003-11-06 | Christoph Schultheiss | Method and apparatus for processing ashes of incinerator plants |
| JP2003126807A (en) * | 2001-10-29 | 2003-05-07 | Takuma Co Ltd | Incineration ash treatment device |
| JP2003340397A (en) * | 2002-05-28 | 2003-12-02 | Jfe Engineering Kk | Detoxifying treatment method for waste incineration ash and waste incineration equipment |
| JP2004074100A (en) * | 2002-08-22 | 2004-03-11 | Kobe Steel Ltd | Method of treating incineration ash |
| JP2005125210A (en) * | 2003-10-22 | 2005-05-19 | Kurita Water Ind Ltd | Treatment method for incineration main ash |
| JP2006223987A (en) * | 2005-02-17 | 2006-08-31 | Takuma Co Ltd | Reforming treatment method for incineration ash and incineration ash reforming mechanical stoker type incinerator |
| JP2012170907A (en) * | 2011-02-22 | 2012-09-10 | Osaka Gas Co Ltd | Treatment method and treatment equipment for incineration ash |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016165713A (en) * | 2015-03-05 | 2016-09-15 | 大阪瓦斯株式会社 | Treatment method and treatment apparatus of incineration ash |
| JP2020192522A (en) * | 2019-05-24 | 2020-12-03 | 株式会社タクマ | Incinerated ash processing device and incinerated ash processing method |
| JP2021030121A (en) * | 2019-08-20 | 2021-03-01 | 株式会社タクマ | Incinerated ash treatment apparatus and incinerated ash treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6356384B2 (en) | 2018-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI535482B (en) | Use of bromide-containing inorganic salt for reducing mercury emissions from combustion gas streams | |
| JP6356384B2 (en) | Detoxification method for incineration ash | |
| JP5746229B2 (en) | Carbon dioxide stream generation system and method | |
| JP6612629B2 (en) | Sludge incineration system | |
| AU2014349841B2 (en) | Methods for treating waste gas streams from incineration processes by addition of ozone | |
| Kogut et al. | Opportunities for reducing mercury emissions in the cement industry | |
| JP2011089041A (en) | Gas treatment method and device in circulation fluidized bed gasification facility | |
| Wichliński et al. | The release of mercury from polish coals during thermal treatment of fuels in a fluidized bed reactor | |
| JP2013202593A (en) | Treatment method and treatment apparatus of incineration ash | |
| Pisa et al. | Influence of hydrogen enriched gas injection upon polluting emissions from pulverized coal combustion | |
| JP2014126541A (en) | Evaluation method and evaluation device for spontaneous ignition property of low-quality coal | |
| JP2003275543A (en) | Method for treating exhaust gas of waste incineration furnace | |
| Chen et al. | PCDD/Fs inhibition by sludge decomposition gases: effects of sludge dosage, treatment temperature and oxygen content | |
| JP5774869B2 (en) | Incineration ash treatment method and equipment | |
| JP6178544B2 (en) | Cement kiln exhaust gas treatment method | |
| WO2021124592A1 (en) | Flue gas treatment device | |
| JP2008006355A (en) | Drying method of cement burning apparatus and high-moisture organic waste | |
| PL420468A1 (en) | Method for reducing high concentrations of nitrogen oxides in waste gases from Diesel engines | |
| JP5411312B2 (en) | Organic waste processing apparatus, organic waste processing method, and control apparatus | |
| JP2012213713A (en) | Method for treating incineration ash | |
| JP2015054313A (en) | Processing method of incineration ash and incineration apparatus | |
| JP2006095485A (en) | Waste disposal system | |
| JPH11257632A (en) | Waste incineration treating method, restraining occurrence of harmful substance | |
| JP2014122808A (en) | Treatment apparatus and treatment method for radioactive waste | |
| Dziok et al. | A concept of the hybrid mercury removal process from hard coal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20151215 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20161110 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20161122 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20170117 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20170530 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20170704 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A821 Effective date: 20170705 |
|
| A911 | Transfer to examiner for re-examination before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20170726 |
|
| A912 | Re-examination (zenchi) completed and case transferred to appeal board |
Free format text: JAPANESE INTERMEDIATE CODE: A912 Effective date: 20170915 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20180405 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20180614 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 6356384 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |