JP2016108604A - Mercury recovery device and mercury recovery method - Google Patents

Mercury recovery device and mercury recovery method Download PDF

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JP2016108604A
JP2016108604A JP2014246620A JP2014246620A JP2016108604A JP 2016108604 A JP2016108604 A JP 2016108604A JP 2014246620 A JP2014246620 A JP 2014246620A JP 2014246620 A JP2014246620 A JP 2014246620A JP 2016108604 A JP2016108604 A JP 2016108604A
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JP6366186B2 (en
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仁司 輪達
仁司 輪達
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太平洋セメント株式会社
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Abstract

PROBLEM TO BE SOLVED: To efficiently recover mercury from a material containing mercury, at low cost.SOLUTION: A mercury recovery device 1 comprises: an external kiln 4 for indirectly heating a mercury-containing dust D3, for volatilizing mercury contained in the mercury-containing dust D3, and discharging transport gas G1 containing the volatilized mercury; a bag filter 5 for collecting the transport gas G1 discharged from the external kiln 4; a fan 6 for adding dilution air A2 to the mercury-containing gas G2 discharged from the bag filter 5; and an active carbon absorption tower 7 for absorbing the mercury contained in the mercury dilution gas G3, and recovering the mercury. The external kiln 4 comprises a gas discharge part 4e for discharging the transport gas G1, and a dust discharge part 4f for discharging the mercury removal dust D4 generated by removing the mercury from the mercury-containing dust D3. By setting mercury density of the mercury dilution gas G3 to equal to or lower than 1,000 mg/m, mercury absorption efficiency in the active carbon absorption tower 7 is enhanced.SELECTED DRAWING: Figure 1

Description

本発明は、セメントキルン排ガスから回収したダストや石炭灰等の水銀を含む物質から水銀を回収する装置及び方法に関する。   The present invention relates to an apparatus and method for recovering mercury from a substance containing mercury such as dust and coal ash recovered from cement kiln exhaust gas.

セメントキルン排ガスには、セメントの主原料である石灰石等の天然原料が含有する水銀や、フライアッシュ等のリサイクル資源に含まれる水銀に由来する微量の水銀が含まれている。セメントキルン排ガス中の水銀が増加すると、大気汚染の原因となる虞があり、フライアッシュ等のリサイクル資源利用拡大の阻害要因となる虞もある。   Cement kiln exhaust gas contains mercury contained in natural raw materials such as limestone, which is the main raw material of cement, and trace amounts of mercury derived from mercury contained in recycled resources such as fly ash. If the mercury in the cement kiln exhaust gas increases, it may cause air pollution, which may hinder the expansion of the use of recycled resources such as fly ash.

そこで、特許文献1には、図2に示すように、空気A11を加熱する熱風炉12と、セメントキルン排ガスから回収した、水銀を含むキルンダストD11を熱風炉12からのガスG11で直接加熱する抽気ダクト13と、揮発水銀を含む搬送用ガスG12を集塵して水銀含有ガスG13と水銀除去ダストD12とに分離するサイクロン14と、水銀含有ガスG13を集塵して水銀含有ガスG14と水銀除去ダストD13とに分離するバグフィルタ15と、水銀含有ガスG14から熱回収する熱交換器16と、水銀含有ガスG15に含まれる水銀を回収する活性炭吸着塔19と、熱交換器16で生じた熱を熱風炉12に供給するファン18とを備えるセメントキルン排ガスの処理装置11が提案されている。   Therefore, in Patent Document 1, as shown in FIG. 2, a hot air furnace 12 for heating air A11 and a kiln dust D11 containing mercury recovered from cement kiln exhaust gas and directly heated with gas G11 from the hot air furnace 12 are extracted. Duct 13, cyclone 14 that collects carrier gas G 12 containing volatile mercury and separates it into mercury-containing gas G 13 and mercury removal dust D 12, and mercury-containing gas G 13 that collects mercury-containing gas G 14 and removes mercury Bag filter 15 separated into dust D13, heat exchanger 16 for recovering heat from mercury-containing gas G14, activated carbon adsorption tower 19 for recovering mercury contained in mercury-containing gas G15, and heat generated in heat exchanger 16 A cement kiln exhaust gas treatment device 11 including a fan 18 for supplying the hot air furnace 12 to the hot air furnace 12 has been proposed.

特開2011−88770号公報JP 2011-88770 A

しかし、上記特許文献1に記載の処理方法では、キルンダストD11を均一に加熱することが容易ではなく、キルンダストD11中の水銀を漏れなく揮発させるには加熱に用いるガスG11を大量に使用せざるを得なかった。このため、搬送用ガスG12の量が多くなり、加熱装置としての抽気ダクト13、集塵装置としてのサイクロン14やバグフィルタ15、及び水銀吸着装置としての活性炭吸着塔19等の関連設備を大型化せざるを得ず、設備コスト及び運転コストが高くなるという問題があった。   However, in the processing method described in Patent Document 1, it is not easy to uniformly heat the kiln dust D11, and in order to volatilize the mercury in the kiln dust D11 without leakage, a large amount of gas G11 used for heating must be used. I didn't get it. For this reason, the amount of the transfer gas G12 increases, and the related equipment such as the extraction duct 13 as the heating device, the cyclone 14 and the bag filter 15 as the dust collector, and the activated carbon adsorption tower 19 as the mercury adsorption device are enlarged. Inevitably, there was a problem that the equipment cost and the operating cost were increased.

そこで、本発明は、上記従来技術における問題点に鑑みてなされたものであって、低コストで水銀を含む物質から効率よく水銀を回収することを目的とする。   Therefore, the present invention has been made in view of the above problems in the prior art, and an object of the present invention is to efficiently recover mercury from a substance containing mercury at a low cost.

上記目的を達成するため、本発明は、水銀回収装置であって、水銀を含む物質を間接加熱して該物質に含まれる水銀を揮発させ、揮発水銀を含む搬送用ガスを排出する間接加熱装置と、該間接加熱装置から排出された搬送用ガスを集塵する集塵装置と、該集塵装置の排ガスに希釈用ガスを添加する希釈用ガス添加装置と、該希釈された排ガスに含まれる水銀を吸着して回収する水銀吸着装置とを備えることを特徴とする。   In order to achieve the above object, the present invention is a mercury recovery apparatus, which indirectly heats a substance containing mercury, volatilizes mercury contained in the substance, and discharges a carrier gas containing volatile mercury. A dust collector that collects the carrier gas discharged from the indirect heating device, a dilution gas addition device that adds a dilution gas to the exhaust gas of the dust collector, and the diluted exhaust gas. And a mercury adsorption device that adsorbs and collects mercury.

本発明によれば、間接加熱装置を用いることで大量のガスを使用しなくとも水銀を含む物質を均一に加熱することができるため、間接加熱装置から排出される搬送用ガス量を少なくすることができ、間接加熱装置、集塵装置、及び水銀吸着装置等の関連設備の小型化が可能となる。また、水銀を含む物質と加熱媒体との接触により加熱媒体に水銀が含まれることを防止することができ、加熱媒体の処理装置を簡易なものとすることができる。   According to the present invention, since a substance containing mercury can be uniformly heated without using a large amount of gas by using an indirect heating device, the amount of transport gas discharged from the indirect heating device can be reduced. It is possible to reduce the size of related equipment such as an indirect heating device, a dust collector, and a mercury adsorption device. Further, contact between the substance containing mercury and the heating medium can prevent mercury from being contained in the heating medium, and the heating medium processing apparatus can be simplified.

さらに、集塵装置の排ガスに希釈用ガスを添加することで、水銀吸着効率を向上させることができると共に、集塵装置に導入する搬送用ガス量を増加させないことで集塵装置の小型化を維持することができる。   Furthermore, by adding a dilution gas to the exhaust gas of the dust collector, the mercury adsorption efficiency can be improved, and the size of the dust collector can be reduced by not increasing the amount of transport gas introduced into the dust collector. Can be maintained.

上記水銀回収装置において、前記間接加熱装置は、前記揮発水銀を含む搬送用ガスを排出するガス排出部と、前記水銀を含む物質から水銀が除去されて生じた水銀除去物質を排出する物質排出部とを備えることができる。これにより、搬送用ガスによって水銀除去物質を搬送せずに揮発水銀のみを搬送すればよいため、搬送用ガスをさらに少量とすることができる。また、前記間接加熱装置を外熱キルンとすることができる。   In the mercury recovery apparatus, the indirect heating device includes a gas discharge unit that discharges the transfer gas containing the volatile mercury, and a substance discharge unit that discharges a mercury removal material generated by removing mercury from the mercury-containing substance. Can be provided. Thereby, since only the volatile mercury has to be transported without transporting the mercury removing substance by the transport gas, the transport gas can be further reduced. Further, the indirect heating device can be an external heat kiln.

さらに、本発明は、水銀回収方法であって、水銀を含む物質を間接加熱して該物質に含まれる水銀を揮発させ、揮発水銀を含む搬送用ガスを集塵し、該集塵後の排ガスに希釈用ガスを添加し、該希釈された排ガスに含まれる水銀を吸着して回収することを特徴とする。   Furthermore, the present invention is a method for recovering mercury, which indirectly heats a substance containing mercury to volatilize mercury contained in the substance, collects a carrier gas containing volatile mercury, and exhausts the exhaust gas after the dust collection. A gas for dilution is added to mercury, and mercury contained in the diluted exhaust gas is adsorbed and recovered.

本発明によれば、上記発明と同様に、間接加熱を行うことで大量のガスを使用しなくとも水銀を含む物質を均一に加熱することができるため、搬送用ガス量を少なくすることができ、間接加熱、集塵、及び水銀吸着に要するコストを低減することができる。また、水銀を含む物質と加熱媒体との接触により加熱媒体に水銀が含まれることを防止することができ、加熱媒体の処理を簡易なものとすることができる。   According to the present invention, as in the case of the above-mentioned invention, since the substance containing mercury can be heated uniformly by performing indirect heating without using a large amount of gas, the amount of gas for transportation can be reduced. The cost required for indirect heating, dust collection, and mercury adsorption can be reduced. Further, contact of the substance containing mercury with the heating medium can prevent the heating medium from containing mercury, and the heating medium can be easily processed.

さらに、集塵後の排ガスに希釈用ガスを添加することで、水銀吸着効率を向上させることができると共に、集塵する搬送用ガス量を増加させないことで集塵に要するコストを低く維持することができる。   Furthermore, by adding a dilution gas to the exhaust gas after dust collection, the mercury adsorption efficiency can be improved, and the cost required for dust collection can be kept low by not increasing the amount of transport gas to be collected. Can do.

上記水銀回収方法において、前記間接加熱によって生じた揮発水銀を含むガスと水銀除去物質とを互いに分離し、該揮発水銀を含むガスを前記搬送用ガスとすることができる。これにより、搬送用ガスによって水銀除去物質を搬送せずに揮発水銀のみを搬送すればよいため、搬送用ガスをさらに少量とすることができる。   In the mercury recovery method, the gas containing volatile mercury generated by the indirect heating and the mercury removing substance are separated from each other, and the gas containing volatile mercury can be used as the carrier gas. Thereby, since only the volatile mercury has to be transported without transporting the mercury removing substance by the transport gas, the transport gas can be further reduced.

また、前記集塵後の排ガスに希釈用ガスを添加して該排ガスの水銀濃度を1,000mg/m3以下にすることで、水銀吸着効率をさらに向上させることができる。さらに、前記水銀を含む物質を、セメントキルン排ガスから回収したダスト又は石炭灰とすることができる。前記希釈用ガスの温度を20℃以上80℃以下とすることができ、集塵後の排ガスを冷却すると共に希釈することができ、効率的に水銀を吸着して回収することができる。 Moreover, mercury adsorption efficiency can be further improved by adding a dilution gas to the exhaust gas after dust collection so that the mercury concentration of the exhaust gas is 1,000 mg / m 3 or less. Further, the mercury-containing substance can be dust or coal ash recovered from cement kiln exhaust gas. The temperature of the dilution gas can be set to 20 ° C. or more and 80 ° C. or less, the exhaust gas after dust collection can be cooled and diluted, and mercury can be efficiently adsorbed and recovered.

以上のように、本発明によれば、低コストで水銀を含む物質から効率よく水銀を回収することができる。 As described above, according to the present invention, mercury can be efficiently recovered from a substance containing mercury at low cost.

本発明に係る水銀回収装置の一実施の形態を示す全体構成図である。 It is a whole lineblock diagram showing one embodiment of a mercury recovery device concerning the present invention. 従来の水銀回収装置の一例を示す全体構成図である。 It is a whole block diagram which shows an example of the conventional mercury collection | recovery apparatus.

次に、本発明を実施するための形態について、図面を参照しながら詳細に説明する。尚、以下では、本発明に係る水銀回収装置によってセメントキルン排ガスから回収したダストを処理する場合を例にとって説明する。   Next, an embodiment for carrying out the present invention will be described in detail with reference to the drawings. In the following, a case where dust collected from cement kiln exhaust gas is treated by the mercury recovery apparatus according to the present invention will be described as an example.

図1は本発明に係る水銀回収装置の一実施の形態を示し、この水銀回収装置1は、セメントキルン排ガスから回収した、水銀を含むキルンダストD1を貯留するホッパ2と、ホッパ2から供給されたキルンダストD1と、後述する水銀除去ダストD2とが混在した水銀含有ダストD3を運搬するスクリューコンベア3と、スクリューコンベア3から供給された水銀含有ダストD3を間接加熱し、間接加熱によって揮発した水銀を含むガスと水銀除去ダストD4とを互いに分離する外熱キルン4と、外熱キルン4から排出された搬送用ガスG1を水銀含有ガスG2と水銀除去ダストD2とに分離するバグフィルタ5と、バグフィルタ5から排出された水銀含有ガスG2に希釈用空気A2を添加して水銀希釈ガスG3とするファン6と、水銀希釈ガスG3に含まれる水銀を吸着して回収する活性炭吸着塔7とを備える。   FIG. 1 shows an embodiment of a mercury recovery apparatus according to the present invention. This mercury recovery apparatus 1 is supplied from a hopper 2 that stores kiln dust D1 containing mercury recovered from a cement kiln exhaust gas, and a hopper 2. The screw conveyor 3 that conveys the mercury-containing dust D3 in which the kiln dust D1 and the mercury removal dust D2 to be described later are mixed, and the mercury-containing dust D3 supplied from the screw conveyor 3 is indirectly heated and contains the volatilized mercury by the indirect heating. An external heat kiln 4 that separates the gas and the mercury removal dust D4 from each other; a bag filter 5 that separates the carrier gas G1 discharged from the external heat kiln 4 into the mercury-containing gas G2 and the mercury removal dust D2; A fan 6 for adding a dilution air A2 to the mercury-containing gas G2 discharged from 5 to form a mercury dilution gas G3, and mercury dilution By adsorbing the mercury contained in the scan G3 and a activated carbon adsorption tower 7 to recover.

間接加熱装置としての外熱キルン4は、回転式のキルン4aと、キルン4aを囲繞して高温ガスが導入されるジャケット4bと、水銀含有ダストD3を供給するダスト供給部4cと、空気A1を導入するガス導入部4dと、搬送用ガスG1を排出するガス排出部4eと、水銀除去ダストD4を排出するダスト排出部4fとを有する。   The external heat kiln 4 as an indirect heating device includes a rotary kiln 4a, a jacket 4b that surrounds the kiln 4a and into which high-temperature gas is introduced, a dust supply unit 4c that supplies mercury-containing dust D3, and air A1. It has a gas introduction part 4d to be introduced, a gas discharge part 4e for discharging the carrier gas G1, and a dust discharge part 4f for discharging the mercury removal dust D4.

集塵装置としてのバグフィルタ5には、900℃程度までの耐熱性を有する高耐熱型のバグフィルタや、通常の耐熱性を有するバグフィルタを使用することができる。   As the bag filter 5 as a dust collector, a high heat-resistant bag filter having heat resistance up to about 900 ° C. or a normal heat filter can be used.

水銀吸着装置としての活性炭吸着塔7は、水銀希釈ガスG3中の水銀を吸着して回収するために備えられる。活性炭吸着塔7で使用される活性炭としては、市販の活性炭の中で、水銀回収能力に特に優れる活性炭を選定することが望ましく、具体的には、水銀吸着用として調整された硫黄添着処理が施されている活性炭が好適である。   An activated carbon adsorption tower 7 as a mercury adsorption device is provided for adsorbing and recovering mercury in the mercury dilution gas G3. As the activated carbon used in the activated carbon adsorption tower 7, it is desirable to select an activated carbon that is particularly excellent in mercury recovery ability from among commercially available activated carbons. Specifically, a sulfur impregnation treatment adjusted for mercury adsorption is performed. Activated carbon is preferred.

次に、上記構成を有する水銀回収装置1の動作について図1を参照しながら説明する。   Next, the operation of the mercury recovery apparatus 1 having the above configuration will be described with reference to FIG.

外熱キルン4のジャケット4bに高温ガスを導入してキルン4aの内部を加熱し、キルンダストD1をスクリューコンベア3を介してキルン4aに供給して間接加熱する。キルンダストD1は、キルン4aの高温となった内面に接触して加熱され、水銀が揮発する。一方、水銀を除去した水銀除去ダストD4をダスト排出部4fから系外に排出してセメント原料等として利用する。   Hot gas is introduced into the jacket 4b of the external heat kiln 4 to heat the inside of the kiln 4a, and the kiln dust D1 is supplied to the kiln 4a via the screw conveyor 3 and indirectly heated. The kiln dust D1 is heated in contact with the inner surface of the kiln 4a having a high temperature, and mercury is volatilized. On the other hand, the mercury-removed dust D4 from which mercury has been removed is discharged out of the system from the dust discharge part 4f and used as a cement raw material or the like.

ガス導入部4dから導入した空気A1によって揮発した水銀を搬送し、揮発水銀を含む搬送用ガスG1をガス排出部4eから排出する。搬送用ガスG1をバグフィルタ5に導入して水銀含有ガスG2と水銀除去ダストD2とに分離する。   Mercury volatilized by the air A1 introduced from the gas introduction part 4d is transported, and a transport gas G1 containing volatile mercury is discharged from the gas discharge part 4e. The carrier gas G1 is introduced into the bag filter 5 and separated into the mercury-containing gas G2 and the mercury removing dust D2.

水銀含有ガスG2に、ファン6から希釈用空気A2を添加して水銀含有ガスG2の水銀濃度が活性炭吸着塔7での吸着に適した濃度(1,000mg/m3以下)となるように希釈した後、水銀希釈ガスG3中の水銀を活性炭吸着塔7で吸着して回収する。ここで、希釈用空気A2の温度を20℃〜80℃にすることで、水銀含有ガスG2を希釈するだけでなく冷却することもでき、活性炭吸着塔7での吸着効率を高めることができる。活性炭吸着塔7から排出された水銀除去ガスG4は、適切な排ガス処理をした後大気に放出する。一方、水銀除去ダストD2は、スクリューコンベア3に戻し、キルンダストD1と共に水銀含有ダストD3としてキルン4aに供給する。 Dilution air A2 is added to the mercury-containing gas G2 from the fan 6 so that the mercury concentration of the mercury-containing gas G2 becomes a concentration suitable for adsorption in the activated carbon adsorption tower 7 (1,000 mg / m 3 or less). After that, mercury in the mercury dilution gas G3 is adsorbed by the activated carbon adsorption tower 7 and recovered. Here, by setting the temperature of the dilution air A2 to 20 ° C. to 80 ° C., the mercury-containing gas G2 can be cooled as well as being diluted, and the adsorption efficiency in the activated carbon adsorption tower 7 can be increased. The mercury removal gas G4 discharged from the activated carbon adsorption tower 7 is discharged into the atmosphere after appropriate exhaust gas treatment. On the other hand, the mercury removal dust D2 is returned to the screw conveyor 3 and supplied to the kiln 4a as the mercury-containing dust D3 together with the kiln dust D1.

以上のように、上記実施の形態では、外熱キルン4を用いることで大量のガスを使用しなくとも水銀含有ダストD3をジャケット4bによって均一に加熱することができるため、外熱キルン4のガス排出部4eから排出される搬送用ガスG1の量を少なくすることができ、外熱キルン4、バグフィルタ5、及び活性炭吸着塔7等の関連設備の小型化が可能となる。また、水銀含有ダストD3と加熱媒体(本実施の形態ではジャケット4bに導入される高温ガス)との接触により加熱媒体に水銀が含まれることを防止することができ、加熱媒体の処理装置を簡易なものとすることができる。   As described above, in the above-described embodiment, since the mercury-containing dust D3 can be uniformly heated by the jacket 4b without using a large amount of gas by using the external heat kiln 4, the gas of the external heat kiln 4 is used. The amount of the transfer gas G1 discharged from the discharge unit 4e can be reduced, and the related equipment such as the external heat kiln 4, the bag filter 5, and the activated carbon adsorption tower 7 can be downsized. Further, it is possible to prevent mercury from being contained in the heating medium due to the contact between the mercury-containing dust D3 and the heating medium (in this embodiment, the high temperature gas introduced into the jacket 4b), and the heating medium processing apparatus can be simplified. Can be.

さらに、バグフィルタ5から排出される水銀含有ガスG2に希釈用空気A2を添加することで、活性炭吸着塔7における水銀吸着効率を向上させると共に、バグフィルタ5に導入する搬送用ガスG1の量を増加させずに済むため、バグフィルタ5の小型化を維持することができる。   Further, by adding dilution air A2 to the mercury-containing gas G2 discharged from the bag filter 5, the mercury adsorption efficiency in the activated carbon adsorption tower 7 is improved and the amount of the carrier gas G1 introduced into the bag filter 5 is reduced. Since it is not necessary to increase the size, the downsizing of the bag filter 5 can be maintained.

尚、上記実施の形態では、セメントキルン排ガスから回収したダストを処理する場合について説明したが、石炭灰等の水銀を含む物質であれば、その他の物質を処理することも可能である。   In addition, although the said embodiment demonstrated the case where the dust collect | recovered from cement kiln exhaust gas was processed, if it is a substance containing mercury, such as coal ash, another substance can also be processed.

また、外熱キルン4のガス導入部4dに導入する空気A1に代えて不活性ガスを用いることもでき、希釈用ガスとして希釈用空気A2以外に不活性ガスを用いることもできる。また、加熱した空気A1を外熱キルン4のガス導入部4dに導入することもでき、空気A1をキルン4a内に滞留させて加熱することもできる。外熱キルン4のキルン4aの内部を加熱するにあたり、高温ガス以外の加熱媒体を用いてもよい。   Moreover, it can replace with the air A1 introduce | transduced into the gas introduction part 4d of the external heat kiln 4, can also use an inert gas, and can also use an inert gas other than the dilution air A2 as a dilution gas. Moreover, the heated air A1 can also be introduce | transduced into the gas introduction part 4d of the external heat kiln 4, and the air A1 can also be retained in the kiln 4a and can be heated. In heating the inside of the kiln 4a of the external heat kiln 4, a heating medium other than the high-temperature gas may be used.

さらに、上記水銀回収装置1における外熱キルン4、バグフィルタ5、活性炭吸着塔7に代えて他の形式の間接加熱装置、集塵装置、水銀吸着装置を用いることもできる。外熱キルン4は、搬送用ガスG1を排出するガス排出部4eと、水銀除去ダストD4を排出するダスト排出部4fとを有し、搬送用ガスG1と水銀除去ダストD4を別々に排出するが、水銀除去ダストの一部が搬送用ガスG1に混在するためバグフィルタ5を設けている。搬送用ガスと水銀除去ダストとの排出部が共通するような間接加熱装置を用い、搬送用ガス中の水銀除去ダストの濃度が高くなった場合でも、集塵装置で水銀除去ダストを集塵して対応することができる。   Furthermore, instead of the external heat kiln 4, the bag filter 5, and the activated carbon adsorption tower 7 in the mercury recovery apparatus 1, other types of indirect heating devices, dust collectors, and mercury adsorption devices can be used. The external heat kiln 4 has a gas discharge part 4e for discharging the transfer gas G1 and a dust discharge part 4f for discharging the mercury removal dust D4, and discharges the transfer gas G1 and the mercury removal dust D4 separately. The bag filter 5 is provided because a part of the mercury removing dust is mixed in the carrier gas G1. Even if the concentration of mercury removal dust in the carrier gas increases, the mercury collector dust is collected by the dust collector using an indirect heating device that has a common discharge section for the carrier gas and mercury removal dust. Can respond.

1 水銀回収装置
2 ホッパ
3 スクリューコンベア
4 外熱キルン
4a キルン
4b ジャケット
4c ダスト供給部
4d ガス導入部
4e ガス排出部
4f ダスト排出部
5 バグフィルタ
6 ファン
7 活性炭吸着塔
A1 空気
A2 希釈用空気
D1 キルンダスト
D2 水銀除去ダスト
D3 水銀含有ダスト
D4 水銀除去ダスト
G1 搬送用ガス
G2 水銀含有ガス
G3 水銀希釈ガス
G4 水銀除去ガス
DESCRIPTION OF SYMBOLS 1 Mercury recovery apparatus 2 Hopper 3 Screw conveyor 4 External heat kiln 4a Kiln 4b Jacket 4c Dust supply part 4d Gas introduction part 4e Gas discharge part 4f Dust discharge part 5 Bag filter 6 Fan 7 Activated carbon adsorption tower A1 Air A2 Dilution air D1 Kiln dust D2 Mercury removal dust D3 Mercury-containing dust D4 Mercury removal dust G1 Transport gas G2 Mercury-containing gas G3 Mercury dilution gas G4 Mercury removal gas

Claims (8)

  1. 水銀を含む物質を間接加熱して該物質に含まれる水銀を揮発させ、揮発水銀を含む搬送用ガスを排出する間接加熱装置と、
    該間接加熱装置から排出された搬送用ガスを集塵する集塵装置と、
    該集塵装置の排ガスに希釈用ガスを添加する希釈用ガス添加装置と、
    該希釈された排ガスに含まれる水銀を吸着して回収する水銀吸着装置とを備えることを特徴とする水銀回収装置。
    An indirect heating device that indirectly heats a substance containing mercury to volatilize mercury contained in the substance, and discharges a carrier gas containing volatile mercury;
    A dust collector that collects the carrier gas discharged from the indirect heating device;
    A dilution gas addition device for adding a dilution gas to the exhaust gas of the dust collector;
    A mercury recovery apparatus comprising: a mercury adsorption device that adsorbs and collects mercury contained in the diluted exhaust gas. A mercury recovery apparatus comprising: a mercury adsorption device that adsorbs and collects mercury contained in the diluted exhaust gas.
  2. 前記間接加熱装置は、前記揮発水銀を含む搬送用ガスを排出するガス排出部と、前記水銀を含む物質から水銀が除去されて生じた水銀除去物質を排出する物質排出部とを備えることを特徴とする請求項1に記載の水銀回収装置。 The indirect heating device includes a gas discharge unit that discharges the carrier gas containing the volatile mercury, and a substance discharge unit that discharges a mercury removing substance generated by removing mercury from the mercury-containing substance. The mercury recovery apparatus according to claim 1.
  3. 前記間接加熱装置は、外熱キルンであることを特徴とする請求項1又は2に記載の水銀回収装置。 The mercury recovery apparatus according to claim 1, wherein the indirect heating device is an external heat kiln.
  4. 水銀を含む物質を間接加熱して該物質に含まれる水銀を揮発させ、
    揮発水銀を含む搬送用ガスを集塵し、
    該集塵後の排ガスに希釈用ガスを添加し、
    該希釈された排ガスに含まれる水銀を吸着して回収することを特徴とする水銀回収方法。
    Indirectly heating a substance containing mercury to volatilize mercury contained in the substance,
    Collecting transport gas containing volatile mercury,
    Add dilution gas to the exhaust gas after dust collection,

    A mercury recovery method comprising adsorbing and recovering mercury contained in the diluted exhaust gas. A mercury recovery method comprising adsorbing and recovering mercury contained in the diluted exhaust gas.
  5. 前記間接加熱によって生じた揮発水銀を含むガスと水銀除去物質とを互いに分離し、該揮発水銀を含むガスを前記搬送用ガスとすることを特徴とする請求項4に記載の水銀回収方法。 The mercury recovery method according to claim 4, wherein the gas containing volatile mercury and the mercury removing material generated by the indirect heating are separated from each other, and the gas containing volatile mercury is used as the carrier gas.
  6. 前記集塵後の排ガスに希釈用ガスを添加して該排ガスの水銀濃度を1,000mg/m 3以下にすることを特徴とする請求項4又は5に記載の水銀回収方法。 The mercury recovery method according to claim 4 or 5, wherein a dilution gas is added to the exhaust gas after dust collection so that the mercury concentration of the exhaust gas is 1,000 mg / m 3 or less.
  7. 前記水銀を含む物質は、セメントキルン排ガスから回収したダスト又は石炭灰であることを特徴とする請求項4、5又は6に記載の水銀回収方法。 The mercury recovery method according to claim 4, 5 or 6, wherein the substance containing mercury is dust or coal ash recovered from a cement kiln exhaust gas.
  8. 前記希釈用ガスの温度は、20℃以上80℃以下であることを特徴とする請求項4乃至7のいずれかに記載の水銀回収方法。   The mercury recovery method according to claim 4, wherein the temperature of the dilution gas is 20 ° C. or higher and 80 ° C. or lower.
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