JP2010075784A - Mercury removing method for combustion flue gas - Google Patents

Mercury removing method for combustion flue gas Download PDF

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JP2010075784A
JP2010075784A JP2008244183A JP2008244183A JP2010075784A JP 2010075784 A JP2010075784 A JP 2010075784A JP 2008244183 A JP2008244183 A JP 2008244183A JP 2008244183 A JP2008244183 A JP 2008244183A JP 2010075784 A JP2010075784 A JP 2010075784A
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mercury
exhaust gas
combustion exhaust
coal
flue gas
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JP4932807B2 (en
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Taisuke Araki
泰輔 荒木
Masayoshi Konishi
正芳 小西
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Sumitomo Osaka Cement Co Ltd
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Sumitomo Osaka Cement Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a mercury removing method for a combustion flue gas, for easily removing mercury in the combustion flue gas by effectively utilizing existing equipment without newly using a mercury scavenger or newly installing a mercury removing apparatus or a coal carbonization device by using the coal drying and crushing means of a cement manufacturing facility. <P>SOLUTION: Coal C1 is crushed inside a coal drying and crushing device 6 and turned to powdered coal C2, then the combustion flue gas G1 discharged from the cyclone 1d of the top stage of the suspension preheater 1 of the cement manufacturing facility is introduced to the coal drying and crushing device 6, and the powdered coal C2 is made to adsorb the mercury included in the combustion flue gas G1. The powdered coal C2' which has adsorbed the mercury and the combustion flue gas G2 from which the mercury is removed are introduced to a bag filter 7, only the powdered coal C2' is caught and collected, and the combustion flue gas G2 from which the mercury is removed is discharged from a chimney 8 as cleaned exhaust gas. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、燃焼排ガスの水銀除去方法に関し、更に詳しくは、燃焼排ガスに含まれる水銀の除去装置として、セメント製造設備の付帯設備である石炭乾燥粉砕手段を用いることにより、新たに水銀捕集剤を用いたり、あるいは水銀除去装置を新たに設置することなく、低コストにて容易に除去することが可能な燃焼排ガスの水銀除去方法に関するものである。   The present invention relates to a method for removing mercury from combustion exhaust gas, and more particularly, as a device for removing mercury contained in combustion exhaust gas, by using a coal drying and pulverizing means that is ancillary equipment of a cement production facility, a new mercury collector is provided. The present invention relates to a method for removing mercury from combustion exhaust gas, which can be easily removed at low cost without using a new apparatus or installing a mercury removal apparatus.

従来、都市ごみ焼却炉、産業廃棄物焼却炉、下水汚泥焼却炉等から排出される燃焼排ガス、あるいはセメント製造設備等から排出される燃焼排ガスに含まれる水銀を除去する方法としては、乾式除去方法と湿式除去方法がある。
乾式除去方法は、燃焼排ガスに含まれる水銀を炭素粉末等の固体吸着剤等に吸着させて除去する方法であり、湿式除去方法は、燃焼排ガスを過マンガン酸カリウムやチオ硫酸ナトリウム等の水溶液中に導入して、燃焼排ガスに含まれる水銀を水溶液に移行させ、この水溶液中の水銀を析出させて除去する方法である。 Conventionally, as a method for removing mercury contained in combustion exhaust gas discharged from municipal waste incinerators, industrial waste incinerators, sewage sludge incinerators, etc., or combustion exhaust gas discharged from cement manufacturing facilities, etc., a dry removal method There are wet removal methods.
The dry removal method is a method of removing mercury contained in combustion exhaust gas by adsorbing it on a solid adsorbent such as carbon powder. The wet removal method is a method of removing the combustion exhaust gas in an aqueous solution such as potassium permanganate or sodium thiosulfate. In this method, mercury contained in the combustion exhaust gas is transferred to an aqueous solution, and mercury in this aqueous solution is deposited and removed.

この乾式除去方法としては、石炭を乾留して得られた石炭乾留物を、各種プロセス排ガス中に吹込み、この石炭乾留物に排ガス中のダイオキシン、ＳＯｘ、水銀等の有害成分を吸着し、この石炭乾留物を集塵装置により回収することにより、排ガスを浄化する方法（特許文献１）等が提案されている。
特開２０００−２３７５２８号公報 As this dry removal method, coal dry matter obtained by carbonizing coal is blown into various process exhaust gas, and harmful components such as dioxin, SOx and mercury in the exhaust gas are adsorbed on the coal dry matter, A method (patent document 1) etc. which purify exhaust gas by collect | recovering coal distillate with a dust collector is proposed.
JP 2000-237528 A

ところで、従来の水銀の除去方法においては、炭素粉末を噴射する噴射装置や水溶性の水銀を湿式吸収する装置等が別途必要となるが、セメント製造設備等のような排出ガスの排出量が多い製造設備においては、水銀除去装置が大型化するために、新たな水銀除去装置の設置は、場所的制約及び経済的な理由から難しいという問題点があった。
また、石炭乾留物に排ガス中のダイオキシン、ＳＯｘ、水銀等の有害成分を吸着し、この石炭乾留物を集塵装置により回収する方法では、石炭を乾留する装置が別途必要になり、また、回収した石炭乾留物自体の取り扱いに手間が掛かるという問題点もあった。 By the way, in the conventional mercury removal method, an injection device for injecting carbon powder, a device for wet absorption of water-soluble mercury, etc. are separately required, but the amount of exhaust gas emitted from a cement production facility is large. In a manufacturing facility, since the mercury removal device is enlarged, it is difficult to install a new mercury removal device due to location restrictions and economic reasons.
In addition, a method of adsorbing harmful components such as dioxin, SOx, mercury, etc. in exhaust gas to coal dry matter and recovering this coal dry matter with a dust collector requires an additional device for dry distillation of coal. There was also a problem that it took time and effort to handle the dried coal.

本発明は、上記の課題を解決するためになされたものであって、燃焼排ガスに含まれる水銀を除去する装置として、セメント製造設備の付帯設備である石炭乾燥粉砕手段を用いることにより、新たに水銀捕集剤を用いたり、あるいは水銀除去装置や石炭乾留装置を新たに設置することなく、既存の設備を有効利用することで容易に除去することができる燃焼排ガスの水銀除去方法を提供することを目的とする。   The present invention has been made in order to solve the above-mentioned problems, and as a device for removing mercury contained in combustion exhaust gas, by using a coal dry pulverization means which is an incidental facility of a cement production facility, To provide a mercury removal method for combustion exhaust gas that can be easily removed by effectively using existing equipment without using a mercury scavenger or installing a new mercury removal device or coal distillation device. With the goal.

本発明は、上記課題を解決するために、次の様な燃焼排ガスの水銀除去方法を提供した。
すなわち、本発明の燃焼排ガスの水銀除去方法は、燃焼排ガスに含まれる水銀をセメント製造設備の石炭乾燥粉砕装置を用いて除去する方法であって、前記燃焼排ガスを前記石炭乾燥粉砕装置内の石炭微粉中を通過させ、前記燃焼排ガスに含まれる水銀を前記石炭微粉に吸着させて除去することを特徴とする。 In order to solve the above problems, the present invention provides the following method for removing mercury from combustion exhaust gas.
That is, the mercury removal method for combustion exhaust gas according to the present invention is a method for removing mercury contained in combustion exhaust gas using a coal drying and pulverizing device of a cement manufacturing facility, and the combustion exhaust gas is removed from the coal in the coal drying and pulverizing device. It passes through the fine powder, and the mercury contained in the combustion exhaust gas is adsorbed by the fine coal powder to be removed.

この燃焼排ガスの水銀除去方法では、燃焼排ガスを石炭乾燥粉砕装置内の石炭微粉中を通過させることで、この燃焼排ガスに含まれる水銀を石炭微粉に吸着させて除去する。
これにより、この燃焼排ガスに含まれる水銀は、石炭微粉に吸着されて除去され、この燃焼排ガス中の水銀の濃度は大幅に減少する。 In this mercury removal method of combustion exhaust gas, the combustion exhaust gas is passed through the coal fine powder in the coal drying and pulverizing apparatus, so that the mercury contained in the combustion exhaust gas is adsorbed to the coal fine powder and removed.
Thereby, mercury contained in the combustion exhaust gas is adsorbed and removed by the coal fine powder, and the concentration of mercury in the combustion exhaust gas is greatly reduced.

この燃焼排ガスの水銀除去方法では、前記燃焼排ガスは、前記セメント製造設備のセメントキルン、サスペンションプレヒータ、仮焼炉のうちの１つまたは２つ以上から排出される燃焼排ガスであることが好ましい。
水銀が除去された前記燃焼排ガス及び前記石炭微粉を、分離手段を用いて水銀が除去された燃焼排ガスと石炭微粉とに分離することが好ましい。
前記燃焼排ガスを、前記石炭乾燥粉砕装置の乾燥用熱源として利用することが好ましい。 In this mercury removal method of combustion exhaust gas, the combustion exhaust gas is preferably combustion exhaust gas discharged from one or more of a cement kiln, a suspension preheater, and a calciner of the cement manufacturing facility.
It is preferable to separate the combustion exhaust gas from which mercury has been removed and the coal fine powder into combustion exhaust gas from which mercury has been removed and coal fine powder by using a separating means.
The combustion exhaust gas is preferably used as a heat source for drying of the coal drying and pulverizing apparatus.

本発明の燃焼排ガスの水銀除去方法によれば、燃焼排ガスを石炭乾燥粉砕手段内の石炭微粉中を通過させ、この燃焼排ガスに含まれる水銀を石炭微粉に吸着させて除去するので、燃焼排ガス中の水銀の濃度を大幅に減少させることができる。したがって、セメント製造設備の付帯設備である石炭乾燥粉砕手段を用いることにより、新たに水銀除去用の装置を設置することなく、燃焼排ガスの浄化を容易に行うことができる。   According to the mercury removal method of combustion exhaust gas of the present invention, the combustion exhaust gas is passed through the coal fine powder in the coal dry pulverization means, and the mercury contained in the combustion exhaust gas is adsorbed and removed by the coal fine powder. The concentration of mercury can be greatly reduced. Therefore, by using the coal drying and pulverizing means that is ancillary equipment of the cement manufacturing equipment, it is possible to easily purify the combustion exhaust gas without installing a new mercury removal device.

本発明の燃焼排ガスの水銀除去方法を実施するための最良の形態について、図面に基づき説明する。
なお、本形態は、発明の趣旨をより良く理解させるために具体的に説明するものであり、特に指定のない限り、本発明を限定するものではない。 The best mode for carrying out the mercury removal method for combustion exhaust gas of the present invention will be described with reference to the drawings.
Note that this embodiment is specifically described for better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified.

図１は、本発明の一実施形態の燃焼排ガスの水銀除去方法に用いられるセメント製造設備を示す模式図であり、図において、１は多段のサイクロン１ａ〜１ｄからなるサスペンションプレヒータ、２は仮焼炉、３はセメントキルン、４はクリンカクーラ、５は石炭貯蔵庫、６は石炭乾燥粉砕装置（石炭乾燥粉砕手段）、７はバグフィルタ（分離手段）、８は煙突である。
これら石炭乾燥粉砕装置６及びバグフィルタ７により本実施形態の燃焼排ガスの水銀除去装置９が構成されている。 FIG. 1 is a schematic diagram showing a cement production facility used in a method for removing mercury from combustion exhaust gas according to an embodiment of the present invention. In the figure, 1 is a suspension preheater composed of multi-stage cyclones 1a to 1d, and 2 is calcined. A furnace, 3 is a cement kiln, 4 is a clinker cooler, 5 is a coal storage, 6 is a coal drying and grinding device (coal drying and grinding means), 7 is a bag filter (separating means), and 8 is a chimney.
The coal drying and pulverizing apparatus 6 and the bag filter 7 constitute a combustion exhaust gas mercury removing apparatus 9 of the present embodiment.

石炭乾燥粉砕装置６は、石炭貯蔵庫５から送り出された塊状の石炭Ｃ１を粒子径３００μｍ以下、好ましくは９０μｍ以下に粉砕するとともに、熱風あるいは加熱により乾燥して微粉炭（石炭微粉）Ｃ２とする装置であり、粉砕と乾燥とを同時に実施することのできることが必要である。このような装置としては、例えば、熱風あるいは加熱による乾燥と粉砕とを同時に行うことのできる竪型ローラーミルが好適に用いられる。   The coal drying and pulverizing device 6 pulverizes the bulk coal C1 delivered from the coal storage 5 to a particle size of 300 μm or less, preferably 90 μm or less, and is dried by hot air or heating to obtain pulverized coal (coal fine powder) C2. It is necessary that pulverization and drying can be performed simultaneously. As such an apparatus, for example, a vertical roller mill capable of simultaneously performing drying and pulverization by hot air or heating is preferably used.

この石炭乾燥粉砕装置６では、サスペンションプレヒータ１、仮焼炉２、セメントキルン３のうち１つまたは２つ以上から排出される燃焼排ガスＧ１（５０〜１００μｇ／ｍ３Ｎの水銀を含む）を導入して乾燥粉砕された微粉炭Ｃ２中を通過させ、この燃焼排ガスＧ１に含まれる水銀を微粉炭Ｃ２に吸着させて除去し、この水銀が吸着された微粉炭Ｃ２’及び水銀が除去された燃焼排ガスＧ２を後段のバグフィルタ７に送るようになっている。 In this coal drying and pulverizing apparatus 6, combustion exhaust gas G1 (containing 50 to 100 μg / m 3 N of mercury) discharged from one or more of the suspension preheater 1, the calcining furnace 2, and the cement kiln 3 is introduced. Then, the pulverized coal C2 that has been dried and pulverized is passed through, and the mercury contained in the combustion exhaust gas G1 is adsorbed and removed by the pulverized coal C2. The exhaust gas G2 is sent to the subsequent bag filter 7.

バグフィルタ７は、通気性を有する不織布からなる袋状のフィルタにより構成され、石炭乾燥粉砕装置６から排出される水銀が吸着された微粉炭Ｃ２’及び水銀が除去された燃焼排ガスＧ２から微粉炭Ｃ２’と燃焼排ガスＧ２とを分離するもので、これら微粉炭Ｃ２’及び燃焼排ガスＧ２から微粉炭Ｃ２’のみを捕集し回収して燃料として利用するとともに、水銀が除去された燃焼排ガスＧ２を煙突８に向けて排出する装置であり、導入される燃焼排ガスＧ２の温度は、概ね１００℃〜２００℃である。   The bag filter 7 is constituted by a bag-like filter made of a non-woven fabric having air permeability, and pulverized coal from the pulverized coal C2 ′ adsorbed with mercury discharged from the coal drying and pulverizing apparatus 6 and the combustion exhaust gas G2 from which mercury is removed. C2 ′ and combustion exhaust gas G2 are separated, and only pulverized coal C2 ′ is collected from these pulverized coal C2 ′ and combustion exhaust gas G2, recovered and used as fuel, and combustion exhaust gas G2 from which mercury has been removed is used. It is an apparatus that discharges toward the chimney 8, and the temperature of the introduced combustion exhaust gas G2 is approximately 100 ° C to 200 ° C.

このバグフィルタ７は、必要に応じて電気集塵機等と併用してもよい。
電気集塵機は、導入された燃焼排ガス中のダスト（塵埃）を、負極線による放電で帯電させ、この燃焼排ガスを一対の正極板間に導入することにより、この燃焼排ガス中の帯電したダストを正極板に吸着させて集塵する装置である。 The bag filter 7 may be used in combination with an electric dust collector or the like as necessary.
The electrostatic precipitator charges the dust (dust) in the introduced combustion exhaust gas by discharging with a negative electrode wire, and introduces this combustion exhaust gas between a pair of positive electrode plates, thereby converting the charged dust in the combustion exhaust gas into a positive electrode. It is a device that collects dust by adsorbing to a plate.

次に、本実施形態の燃焼排ガスの水銀除去方法について、図１に基づき説明する。
本実施形態の燃焼排ガスの水銀除去方法は、燃焼排ガスＧ１に含まれる水銀をセメント製造設備の石炭乾燥粉砕装置６を用いて除去する方法であり、燃焼排ガスＧ１を石炭乾燥粉砕装置６内の微粉炭Ｃ２中を通過させ、燃焼排ガスＧ１に含まれる水銀を微粉炭Ｃ２に吸着させて除去する方法である。 Next, a method for removing mercury from combustion exhaust gas according to this embodiment will be described with reference to FIG.
The method for removing mercury from the combustion exhaust gas according to the present embodiment is a method for removing mercury contained in the combustion exhaust gas G1 by using the coal dry pulverization apparatus 6 of the cement manufacturing facility, and the combustion exhaust gas G1 is pulverized in the coal dry pulverization apparatus 6. This is a method of passing through the coal C2 and removing the mercury contained in the combustion exhaust gas G1 by adsorbing it to the pulverized coal C2.

これらの各工程について、さらに詳細に説明する。
ここでは、燃焼排ガスＧ１としては、セメント製造設備のサスペンションプレヒータ１の最上段のサイクロン１ｄから排出される燃焼排ガス、仮焼炉２から排出される燃焼排ガス、セメントキルン３から排出される燃焼排ガス等のいずれか１種、または２種以上を混合した燃焼排ガスを用いる。
一方、石炭Ｃ１としては、燃料として用いられる石炭であれば、特に限定されないが、水銀を吸着することを考慮すると、燃料比（炭素成分／水素成分）の高い石炭が好ましい。 Each of these steps will be described in more detail.
Here, as the combustion exhaust gas G1, the combustion exhaust gas discharged from the uppermost cyclone 1d of the suspension preheater 1 of the cement manufacturing facility, the combustion exhaust gas discharged from the calciner 2, the combustion exhaust gas discharged from the cement kiln 3, etc. Any one of these, or a combustion exhaust gas in which two or more are mixed is used.
On the other hand, the coal C1 is not particularly limited as long as it is a coal used as a fuel. However, in consideration of adsorption of mercury, coal having a high fuel ratio (carbon component / hydrogen component) is preferable.

まず、塊状の石炭Ｃ１を石炭貯蔵庫５から石炭乾燥粉砕装置６に搬入し、この石炭乾燥粉砕装置６内にて粉砕し、粒子径３００μｍ以下、好ましくは９０μｍ以下の微粉炭（石炭微粉）Ｃ２とする。
ここで、粒子径を３００μｍ以下とした理由は、燃焼排ガスに含まれる水銀の吸着量をできるだけ多くするために、できるだけ微粉化してその比表面積をできるだけ大きくする必要があるからである。なお、粒子径が３００μｍを超えると、その微粉の比表面積が小さくなり、水銀を充分に吸着することが難しくなり、その結果、石炭乾燥粉砕装置６から排出される燃焼排ガス中に水銀が残留する虞が生じることとなるので、好ましくない。 First, the bulk coal C1 is carried from the coal storage 5 to the coal drying and pulverizing device 6 and pulverized in the coal drying and pulverizing device 6. The pulverized coal (coal pulverized) C2 having a particle diameter of 300 μm or less, preferably 90 μm or less To do.
Here, the reason why the particle diameter is set to 300 μm or less is that in order to increase the adsorption amount of mercury contained in the combustion exhaust gas as much as possible, it is necessary to make it as fine as possible and to increase its specific surface area as much as possible. When the particle diameter exceeds 300 μm, the specific surface area of the fine powder becomes small, and it becomes difficult to sufficiently adsorb mercury. As a result, mercury remains in the combustion exhaust gas discharged from the coal drying and pulverizing apparatus 6. This is not preferable because there is a fear.

次いで、燃焼排ガスＧ１を石炭乾燥粉砕装置６に導入する。この燃焼排ガスＧ１に含まれる水銀は、微粉炭Ｃ２と接触することにより、微粉炭Ｃ２に吸着され、燃焼排ガスＧ１から除去される。
導入される際の燃焼排ガスＧ１の温度は、この燃焼排ガスＧ１中の水銀を微粉炭Ｃ２に充分に吸着させることができ、しかも一旦吸着した水銀が蒸発しないように充分に低い必要があり、具体的には２００℃以下が好ましく、より好ましくは１５０℃以下である。
一方、微粉炭Ｃ２は燃焼排ガスＧ１により７０℃以下に加熱され、乾燥することとなる。このように、燃焼排ガスＧ１は石炭乾燥粉砕装置６の乾燥用熱源としても有効利用される。 Next, the combustion exhaust gas G1 is introduced into the coal drying and pulverizing apparatus 6. Mercury contained in the combustion exhaust gas G1 is adsorbed by the pulverized coal C2 and removed from the combustion exhaust gas G1 by contacting the pulverized coal C2.
The temperature of the flue gas G1 when introduced must be sufficiently low so that the mercury in the flue gas G1 can be sufficiently adsorbed by the pulverized coal C2 and the once adsorbed mercury does not evaporate. Specifically, it is preferably 200 ° C. or lower, more preferably 150 ° C. or lower.
On the other hand, the pulverized coal C2 is heated to 70 ° C. or less by the combustion exhaust gas G1 and dried. Thus, the combustion exhaust gas G1 is also effectively used as a drying heat source for the coal drying and pulverizing apparatus 6.

この石炭乾燥粉砕装置６から排出された水銀が吸着された微粉炭Ｃ２’及び水銀が除去された燃焼排ガスＧ２は、バグフィルタ７に導入されて微粉炭Ｃ２’のみが捕集されて回収される。
一方、水銀が除去された燃焼排ガスＧ２は、バグフィルタ７を通過することで清浄化された排ガスとなり、最終的には煙突８から排出される。 The pulverized coal C2 ′ from which the mercury discharged from the coal drying and pulverizing apparatus 6 is adsorbed and the combustion exhaust gas G2 from which the mercury has been removed are introduced into the bag filter 7 and only the pulverized coal C2 ′ is collected and recovered. .
On the other hand, the combustion exhaust gas G2 from which mercury has been removed becomes purified exhaust gas by passing through the bag filter 7 and is finally discharged from the chimney 8.

石炭乾燥粉砕装置６から回収された水銀が吸着された微粉炭Ｃ２’は、再度、仮焼炉２、セメントキルン３のうちいずれか、または双方の各バーナーへ送られ、燃料として用いられる。この燃焼工程では、微粉炭Ｃ２’に吸着された水銀は、微粉炭Ｃ２’が燃焼する過程で蒸発し、燃焼排ガス中に再度移行する。
これら一連の工程を循環することで、微粉炭Ｃ２’に吸着される水銀の濃度は循環毎に高くなり、水銀の吸着量が飽和することになる。
この水銀の吸着量が飽和した微粉炭Ｃ２’は、セメント製造設備の系外に取り出し、所定の処理が施され、水銀が吸着していない微粉炭Ｃ２として再利用される。 The pulverized coal C2 ′ to which the mercury recovered from the coal drying and pulverizing apparatus 6 is adsorbed is sent again to either or both of the calcining furnace 2 and the cement kiln 3 and used as fuel. In this combustion process, the mercury adsorbed on the pulverized coal C2 ′ evaporates in the process of burning the pulverized coal C2 ′, and moves again into the combustion exhaust gas.
By circulating these series of steps, the concentration of mercury adsorbed on the pulverized coal C2 ′ increases with each circulation, and the amount of mercury adsorbed is saturated.
The pulverized coal C2 ′ in which the mercury adsorption amount is saturated is taken out of the system of the cement manufacturing facility, subjected to a predetermined treatment, and reused as the pulverized coal C2 not adsorbed with mercury.

以上説明したように、本実施形態の燃焼排ガスの水銀除去方法によれば、燃焼排ガスＧ１を石炭乾燥粉砕装置６内の微粉炭Ｃ２中を通過させ、この燃焼排ガスＧ１に含まれる水銀を微粉炭Ｃ２に吸着させて除去するので、燃焼排ガスＧ１中の水銀の濃度を大幅に減少させることができる。
また、セメント製造設備の付帯設備である石炭乾燥粉砕装置６を用いて燃焼排ガスＧ１から水銀を除去するので、水銀固体吸着剤吹き込み装置及び水銀含有固体吸着剤除去装置、あるいは水銀吸着用の固体吸着物充填塔等の水銀除去装置を別途設ける必要が無く、既存の設備のみで燃焼排ガスＧ１から水銀を効率良く除去することができる。 As described above, according to the mercury removal method for combustion exhaust gas of the present embodiment, the combustion exhaust gas G1 is passed through the pulverized coal C2 in the coal drying and pulverizing apparatus 6, and the mercury contained in the combustion exhaust gas G1 is pulverized coal. Since it is adsorbed and removed by C2, the concentration of mercury in the combustion exhaust gas G1 can be greatly reduced.
Further, since the mercury is removed from the combustion exhaust gas G1 using the coal drying and grinding device 6 which is ancillary equipment of the cement production facility, the mercury solid adsorbent blowing device and the mercury-containing solid adsorbent removing device, or the solid adsorption for mercury adsorption It is not necessary to separately provide a mercury removing device such as a packed tower, and mercury can be efficiently removed from the combustion exhaust gas G1 only with existing equipment.

以下、本発明の燃焼排ガスの水銀除去方法について実施例を挙げて具体的に説明するが、本発明はその要旨を超えない限り、以下の実施例によって何ら制限されるものではない。   Hereinafter, although the example is given and the mercury removal method of the combustion exhaust gas of the present invention will be specifically described, the present invention is not limited by the following example unless it exceeds the gist.

（実施例１）
セメント製造設備のサスペンションプレヒータ１の最上段のサイクロン１ｄから排出される燃焼排ガスを石炭乾燥粉砕装置６に導入し、この石炭乾燥粉砕装置６内の微粉炭と接触させた。
この石炭乾燥粉砕装置６から排出された微粉炭を含む燃焼排ガスを、バグフィルタ７に導入し、バグフィルタ７から排出された燃焼排ガス中の水銀濃度を測定したところ、１．９μｇ／ｍ３Ｎであった。
これにより、燃焼排ガス中の水銀濃度を大幅に低減することができることが分かった。 Example 1
The combustion exhaust gas discharged from the uppermost cyclone 1d of the suspension preheater 1 of the cement production facility was introduced into the coal drying and pulverizing apparatus 6 and brought into contact with the pulverized coal in the coal drying and pulverizing apparatus 6.
The combustion exhaust gas containing pulverized coal discharged from the coal drying and pulverizing apparatus 6 was introduced into the bag filter 7 and the mercury concentration in the combustion exhaust gas discharged from the bag filter 7 was measured. As a result, 1.9 μg / m 3 N Met.
Thereby, it turned out that the mercury concentration in combustion exhaust gas can be reduced significantly.

（比較例１）
セメント製造設備のサスペンションプレヒータ１の最上段のサイクロン１ｄから排出される燃焼排ガスを調湿塔及び電気集塵装置を通過させることにより、燃焼排ガス中の水銀を吸着除去した。
処理後の燃焼排ガス中の水銀濃度を測定したところ、１４．４μｇ／ｍ３Ｎであった。 (Comparative Example 1)
Mercury in the combustion exhaust gas was adsorbed and removed by passing the combustion exhaust gas discharged from the uppermost cyclone 1d of the suspension preheater 1 of the cement production facility through a humidity control tower and an electric dust collector.
Measurement of the mercury concentration in the combustion exhaust gas after treatment was 14.4μg / m 3 N.

（比較例２）
セメント製造設備のサスペンションプレヒータ１の最上段のサイクロン１ｄから排出される燃焼排ガスを石灰石乾燥装置及び電気集塵装置を通過させることにより、燃焼排ガス中の水銀を吸着除去した。
処理後の燃焼排ガス中の水銀濃度を測定したところ、１１．７μｇ／ｍ３Ｎであった。 (Comparative Example 2)
Mercury in the combustion exhaust gas was adsorbed and removed by passing the combustion exhaust gas discharged from the uppermost cyclone 1d of the suspension preheater 1 of the cement manufacturing facility through a limestone drying device and an electrostatic precipitator.
The mercury concentration in the treated flue gas was measured and found to be 11.7 μg / m 3 N.

（比較例３）
セメント製造設備のサスペンションプレヒータ１の最上段のサイクロン１ｄから排出される燃焼排ガスを粘土乾燥装置及び電気集塵装置を通過させることにより、燃焼排ガス中の水銀を吸着除去した。
処理後の燃焼排ガス中の水銀濃度を測定したところ、９．９μｇ／ｍ３Ｎであった。
これらの燃焼排ガス中の水銀濃度を表１に示す。 (Comparative Example 3)
By passing the combustion exhaust gas discharged from the uppermost cyclone 1d of the suspension preheater 1 of the cement manufacturing facility through a clay drying device and an electrostatic precipitator, mercury in the combustion exhaust gas was adsorbed and removed.
The mercury concentration in the treated flue gas was measured and found to be 9.9 μg / m 3 N.
Table 1 shows the mercury concentration in these combustion exhaust gases.

Figure 2010075784
Figure 2010075784

以上により、実施例１にて処理された燃焼排ガスでは、比較例１〜３にて処理された燃焼排ガスと比べて、水銀濃度を大幅に低減することができることが分かった。   From the above, it was found that the combustion exhaust gas treated in Example 1 can greatly reduce the mercury concentration as compared with the combustion exhaust gas treated in Comparative Examples 1 to 3.

本発明の一実施形態の燃焼排ガスの水銀除去方法に用いられるセメント製造設備を示す模式図である。It is a schematic diagram which shows the cement manufacturing equipment used for the mercury removal method of the combustion exhaust gas of one Embodiment of this invention.

符号の説明Explanation of symbols

１ サスペンションプレヒータ
１ａ〜１ｄ サイクロン
２ 仮焼炉
３ セメントキルン
４ クリンカクーラ
５ 石炭貯蔵庫
６ 石炭乾燥粉砕装置
７ バグフィルタ
８ 煙突
９ 燃焼排ガスの水銀除去装置 DESCRIPTION OF SYMBOLS 1 Suspension preheater 1a-1d Cyclone 2 Calciner 3 Cement kiln 4 Clinker cooler 5 Coal storage 6 Coal drying crusher 7 Bag filter 8 Chimney 9 Mercury removal apparatus of combustion exhaust gas

Claims (4)

燃焼排ガスに含まれる水銀をセメント製造設備の石炭乾燥粉砕手段を用いて除去する方法であって、
前記燃焼排ガスを前記石炭乾燥粉砕手段内の石炭微粉中を通過させ、前記燃焼排ガスに含まれる水銀を前記石炭微粉に吸着させて除去することを特徴とする燃焼排ガスの水銀除去方法。 A method of removing mercury contained in combustion exhaust gas using a coal dry pulverization means of a cement manufacturing facility,
A method for removing mercury from combustion exhaust gas, wherein the combustion exhaust gas is passed through coal fine powder in the coal drying and pulverizing means, and mercury contained in the combustion exhaust gas is adsorbed to the coal fine powder and removed. 前記燃焼排ガスは、前記セメント製造設備のセメントキルン、サスペンションプレヒータ、仮焼炉のうちの１つまたは２つ以上から排出される燃焼排ガスであることを特徴とする請求項１記載の燃焼排ガスの水銀除去方法。   The mercury of combustion exhaust gas according to claim 1, wherein the combustion exhaust gas is combustion exhaust gas discharged from one or more of a cement kiln, a suspension preheater, and a calcining furnace of the cement manufacturing facility. Removal method. 水銀が除去された前記燃焼排ガス及び前記石炭微粉を、分離手段を用いて水銀が除去された燃焼排ガスと石炭微粉とに分離することを特徴とする請求項１または２記載の燃焼排ガスの水銀除去方法。   The mercury removal from combustion exhaust gas according to claim 1 or 2, wherein the combustion exhaust gas and coal fine powder from which mercury has been removed are separated into combustion exhaust gas and coal fine powder from which mercury has been removed by using a separating means. Method. 前記燃焼排ガスを前記石炭乾燥粉砕手段の乾燥用熱源として利用することを特徴とする請求項１、２または３記載の燃焼排ガスの水銀除去方法。   The method for removing mercury from combustion exhaust gas according to claim 1, 2 or 3, wherein the combustion exhaust gas is used as a heat source for drying of the coal drying and pulverizing means.
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