JP2009028656A - Exhaust gas treating method and exhaust gas treatment apparatus - Google Patents

Exhaust gas treating method and exhaust gas treatment apparatus Download PDF

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JP2009028656A
JP2009028656A JP2007195804A JP2007195804A JP2009028656A JP 2009028656 A JP2009028656 A JP 2009028656A JP 2007195804 A JP2007195804 A JP 2007195804A JP 2007195804 A JP2007195804 A JP 2007195804A JP 2009028656 A JP2009028656 A JP 2009028656A
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exhaust gas
hydrogen chloride
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coal
gas treatment
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JP5003887B2 (en
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Hiroyuki Kamata
博之 鎌田
Toshiichiro Ueno
俊一朗 上野
Toshiyuki Naito
俊之 内藤
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IHI Corp
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<P>PROBLEM TO BE SOLVED: To provide an exhaust gas treating method and an exhaust gas treatment apparatus, which remove harmful substance and prevent failure like corrosion of a flue, even if excessive HCL for removing mercury is contained in exhaust gas, regardless of the kind of coal or the property of exhaust gas discharged from a combustion apparatus, when burning coal in the combustion apparatus like a boiler. <P>SOLUTION: This invention relates to the exhaust gas treating method for removing mercury contained in exhaust gas discharged from a coal-burning boiler B, when burning fossil fuel like coal C in the coal-burning boiler B. Crushed coal C and a chlorine compound Cl are fed to the coal-burning boiler B for combustion, a hydrogen chloride adsorbent is fed to the vicinity of the upstream side of a dust removing part 5 disposed in a flue R from the coal-burning boiler B for adsorbing excessive hydrogen chloride, and the hydrogen chloride adsorbent having adsorbed hydrogen chloride is collected in the dust removing part 5 together with soot. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、例えば、石炭などの化石燃料をボイラなどの燃焼装置によって燃焼させる際に、この燃焼装置から排出される排ガス中に含まれる水銀などの有害物質を除去するのに用いられる排ガス処理方法及び排ガス処理装置に関するものである。   The present invention relates to an exhaust gas treatment method used for removing harmful substances such as mercury contained in exhaust gas discharged from a combustion apparatus when fossil fuel such as coal is burned by a combustion apparatus such as a boiler. And an exhaust gas treatment apparatus.

上記した化石燃料の燃焼装置、例えば、石炭焚きボイラから排出される石炭の燃焼排ガスには、石炭に起因する水銀とともにＮＯＸやＳＯＸや煤塵などの有害物質が含まれているほか、水銀と同じく石炭に含まれる塩素に起因する塩化水素（ＨＣｌ）も含まれている。
上記水銀などの有害物質を排ガスから除去する排ガス処理装置としては、例えば、石炭焚きボイラから煙突に至るまでの煙道に、脱硝部、脱塵部及び脱硫部を順次配置して成るものがある。 Combustion apparatus of fossil fuels as described above, for example, in addition to the flue gas of the coal discharged from coal-fired boilers, which contain harmful substances such as NO X and SO X and dust with mercury caused by coal, mercury Similarly, hydrogen chloride (HCl) derived from chlorine contained in coal is also included.
As an exhaust gas treatment apparatus for removing harmful substances such as mercury from exhaust gas, there is, for example, an apparatus in which a denitration part, a dust removal part and a desulfurization part are sequentially arranged in a flue from a coal-fired boiler to a chimney. .

ここで、水銀は、難溶性の金属水銀Ｈｇ０と、水溶性の２価水銀Ｈｇ２＋（ＨｇＣｌ２）と、燃焼灰に付着した粒子状水銀ＨｇＰとの三つの形態に分かれて排ガス中に存在する。そのうちの粒子状水銀ＨｇＰは、その大半がこの排ガス処理装置の電気集じん器やバグフィルタなどの脱塵部で除去され、２価水銀Ｈｇ２＋は、湿式の脱硫部で高効率に除去されるが、排ガス中に含まれる金属水銀Ｈｇ０は、脱塵部や脱硫部でほとんど除去されずに大部分が大気に放出されているのが現状である。 Here, mercury, and metal mercury Hg 0 sparingly soluble, divalent mercury Hg 2+ soluble and (HgCl 2), in the exhaust gas is divided into three forms with particulate mercury Hg P adhering to the combustion ash Exists. Most of the mercury Hg P is removed by dust removal parts such as electric dust collectors and bag filters of the exhaust gas treatment device, and divalent mercury Hg 2+ is removed efficiently by the wet desulfurization part. However, the present situation is that most of the metallic mercury Hg 0 contained in the exhaust gas is released to the atmosphere without being almost removed by the dedusting part or the desulfurization part.

大気中に放出された金属水銀Ｈｇ０は、環境中でより有害な有機水銀（メチル水銀）に変換されるので、この有機水銀が魚貝類などの食用生物に蓄積されて、これが食物連鎖を経て人体内へ入り込むことが懸念されている。
この現状を踏まえて、米国環境保護局では、石炭焚き火力発電所からの水銀排出量を規制することを決定していて、水銀排出量を２０１０年までに現行の３０％削減し、さらに、２０１８年までに現行の７０％削減することを義務付けており、これと同様に、カナダでも石炭焚き火力発電所からの水銀排出量の規制を決定している。 Metallic mercury Hg 0 released into the atmosphere is converted into more harmful organic mercury (methylmercury) in the environment, and this organic mercury is accumulated in edible organisms such as fish and shellfish, which passes through the food chain. There is concern about entering the human body.
In light of this situation, the US Environmental Protection Agency has decided to regulate mercury emissions from coal-fired thermal power plants, reducing mercury emissions by 30% by 2010, and 2018 In the same way, Canada has decided to regulate mercury emissions from coal-fired thermal power plants.

排ガス中に含まれる金属水銀Ｈｇ０は、上記塩化水素（ＨＣｌ）によって、反応式（１）に示すように、脱硝触媒や石炭灰や未燃焼分炭素の表面上で酸化される。
Ｈｇ０＋２ＨＣｌ＋１／２Ｏ２ → ＨｇＣｌ２＋Ｈ２Ｏ 反応式（１）
但し、２価水銀Ｈｇ２＋はＨｇＣｌ２である。
脱硝触媒上での水銀酸化効率は、ＨＣｌ濃度が高い程高くなる。つまり、ＨＣｌ濃度が高い程ＨｇＣｌ２の生成割合が増加することとなり、その結果、脱塵部や脱硫部で捕集される水銀の割合も増加する。
ＨｇＣｌ２は、Ｈｇ０に比べて吸着性が強いことから、脱塵部において灰の表面に吸着して粒子状水銀ＨｇＰとして捕集される。この際、脱塵部で捕集される水銀の割合は、灰中の未燃分炭素の量に依存するので、未燃分炭素が少ない場合は、脱塵部において灰により捕集される割合は少なくなる。 The metallic mercury Hg 0 contained in the exhaust gas is oxidized on the surface of the denitration catalyst, coal ash, and unburned carbon by the hydrogen chloride (HCl) as shown in the reaction formula (1).
Hg 0 + 2HCl + 1 / 2O 2 → HgCl 2 + H 2 O Reaction formula (1)
However, divalent mercury Hg 2+ is HgCl 2 .
The mercury oxidation efficiency on the denitration catalyst increases as the HCl concentration increases. That is, the higher the HCl concentration, the higher the generation ratio of HgCl 2. As a result, the ratio of mercury collected in the dedusting section and desulfurization section also increases.
Since HgCl 2 has a stronger adsorptivity than Hg 0 , it is adsorbed on the surface of ash in the dust removal part and collected as particulate mercury Hg P. At this time, since the proportion of mercury collected in the dust removal part depends on the amount of unburned carbon in the ash, if there is little unburned carbon, the percentage collected by the ash in the dust removal part Will be less.

このように、脱塵部において粒子状水銀ＨｇＰとして捕集される割合がそれほど高くなければ、脱硝触媒上で酸化された金属水銀Ｈｇ０及び２価水銀Ｈｇ２＋（ＨｇＣｌ２）のうちの相当量は、脱塵部を通過して脱硫部の排水中に捕集されることとなる。
ここで、脱塵部で捕集された灰は、セメントやコンクリート材料として有効に利用されるが、水銀を従来よりも多く含むため、水銀溶出等の対策に一層の配慮が必要である。 Thus, if the ratio collected as particulate mercury Hg P in the dedusting part is not so high, it is equivalent to metal mercury Hg 0 oxidized on the denitration catalyst and divalent mercury Hg 2+ (HgCl 2 ). The amount passes through the dedusting part and is collected in the drainage of the desulfurization part.
Here, the ash collected in the dust removal part is effectively used as a cement or concrete material. However, since it contains more mercury than in the past, further consideration must be given to measures such as mercury elution.

一方、脱硫部に到達した水銀は、脱硫部の排水中における汚泥の一部として捕集され、産業廃棄物として管理された状態で処理し得ることとなる。
したがって、脱硝触媒上で酸化された水銀は、脱塵部で捕集するよりも脱硫部で捕集した方がより望ましいと考えられる。
従来において、燃焼装置から排出される排ガス中の水銀を除去する技術として、煤塵を除去する電気集じん器やバグハウスなどの脱塵部の上流に、活性炭などの水銀吸着剤を吹き込み、この吸着剤表面に水銀を吸着させて除去する方法が提案されている（例えば、特許文献１参照）。 On the other hand, mercury that has reached the desulfurization section is collected as part of the sludge in the drainage of the desulfurization section, and can be treated in a state managed as industrial waste.
Therefore, it is considered that mercury oxidized on the denitration catalyst is more preferably collected in the desulfurization part than in the dust removal part.
Conventionally, as a technology for removing mercury in exhaust gas discharged from combustion equipment, mercury adsorbents such as activated carbon are blown upstream of dust removal parts such as electric dust collectors and bag houses that remove soot and dust. There has been proposed a method for removing mercury by adsorbing mercury on the surface of the agent (see, for example, Patent Document 1).

しかし、この吸着剤を用いた除去技術では、吸着剤を常時吹き込む必要があるため、ランニングコストが高くつくうえ、排ガス中のＨＣｌ濃度などのガス性状により効率が変化するといった欠点がある。
この排ガス中のＨＣｌ濃度に関して言えば、元来、石炭中に含まれる塩素の量が、数ppmから数１００ppmと少ないのに加えて、石炭の種類によって含有量に大きなバラツキがあり、これを燃焼排ガス中のＨＣｌ濃度に換算すると、１ppm未満から数１０ppmとなってしまい、このように排ガス中のＨＣｌ濃度が低い場合には、排ガスの性状にもよるが、脱硝触媒や未燃分炭素上での水銀酸化効率が低下し、これに伴って脱塵部及び脱硫部での水銀捕集効率も低下する。 However, this removal technique using an adsorbent has the disadvantages that the adsorbent needs to be constantly blown, so that the running cost is high and the efficiency varies depending on the gas properties such as HCl concentration in the exhaust gas.
In terms of the concentration of HCl in the exhaust gas, the amount of chlorine contained in the coal is originally small, from several ppm to several hundred ppm, and the content varies greatly depending on the type of coal. When converted to HCl concentration in the exhaust gas, the concentration is from less than 1 ppm to several tens of ppm. When the HCl concentration in the exhaust gas is low in this way, depending on the properties of the exhaust gas, it depends on the denitration catalyst and unburned carbon. As a result, the mercury oxidation efficiency decreases, and the mercury collection efficiency in the dedusting section and desulfurization section also decreases.

これに対応するべく、石炭焚きボイラからの煙道中にＨＣｌを注入する方法（例えば、特許文献２参照）や、塩素化合物を石炭とともに燃焼装置に供給して燃焼させた後、電気集じん器などの脱塵部の前で排ガス温度を１５０℃以下に冷却して、脱塵部において水銀の除去を行う方法（例えば、特許文献３参照）が提案されている。
米国特許第6521021号 特開平10-230137号公報 特開2000-325747号公報 In order to cope with this, a method of injecting HCl into the flue from a coal-fired boiler (see, for example, Patent Document 2), a chlorine compound supplied to a combustion device together with coal, and then burned, an electric dust collector, etc. A method has been proposed in which the exhaust gas temperature is cooled to 150 ° C. or lower in front of the dust removal section and mercury is removed in the dust removal section (see, for example, Patent Document 3).
U.S. Patent No. 6521021 Japanese Patent Laid-Open No. 10-230137 JP 2000-325747 A

ところが、上記した煙道中にＨＣｌを注入して水銀を除去する方法や、塩素化合物を石炭とともに燃焼装置に供給して燃焼させて脱塵部において水銀の除去を行う方法では、脱硝触媒や未燃分炭素上での水銀酸化効率を上げるために、排ガス中のＨＣｌ濃度を高くする必要がある。
つまり、排ガス中に過剰な量のＨＣｌが含まれる可能性があり、この場合には、排ガス中のＨＣｌが煙道中の結露水や脱硫部のスプレー液と反応することで塩酸が生じてしまい、腐食を引き起こしたり、脱硫部の性能低下を招いたりすることがないとは言えない。 However, in the method of removing mercury by injecting HCl into the flue and the method of removing chlorine in the dedusting section by supplying chlorine to a combustion device together with coal and burning it, the denitration catalyst or unburned In order to increase the mercury oxidation efficiency on carbon, it is necessary to increase the HCl concentration in the exhaust gas.
In other words, there is a possibility that an excessive amount of HCl is contained in the exhaust gas. In this case, HCl in the exhaust gas reacts with the dew condensation water in the flue and the spray liquid in the desulfurization section, thereby generating hydrochloric acid. It cannot be said that it does not cause corrosion or decrease the performance of the desulfurization part.

また、水銀除去を目的としない排ガス処理においても、すなわち、煙道中へのＨＣｌの注入や、石炭に塩素化合物の添加を行わない場合の排ガス処理においても、石炭中に含まれる塩素の量が多い場合には、排ガス中のＨＣｌ濃度が高まって、上記と同様の不具合が生じる可能性がないとは言えず、この問題を解決することが従来の課題となっている。
本発明は、上記した課題を解決するためになされたもので、化石燃料、例えば、石炭をボイラなどの燃焼装置によって燃焼させる際に、石炭の種類や燃焼装置から排出される排ガスの性状にかかわりなく、有害物質を除去することができるのは勿論のこと、例えば、水銀除去用のＨＣｌが排ガス中に過剰に含まれる場合であったとしても、煙道が腐食するなどといった不具合が生じるのを阻止することができる排ガス処理方法及び排ガス処理装置を提供することを目的としている。 In addition, in the exhaust gas treatment not intended for mercury removal, that is, in the exhaust gas treatment when HCl is injected into the flue or when no chlorine compound is added to the coal, the amount of chlorine contained in the coal is large. In this case, it cannot be said that there is no possibility that the concentration of HCl in the exhaust gas increases to cause the same problem as described above, and it has been a conventional problem to solve this problem.
The present invention has been made to solve the above-described problems, and relates to the type of coal and the properties of exhaust gas discharged from the combustion device when fossil fuel, for example, coal, is burned by a combustion device such as a boiler. In addition, it is possible to remove harmful substances, for example, even if HCl for mercury removal is excessively contained in the exhaust gas, problems such as corrosion of the flue may occur. It is an object of the present invention to provide an exhaust gas treatment method and an exhaust gas treatment device that can be prevented.

本発明の請求項１に係る発明は、石炭などの化石燃料をボイラなどの燃焼装置で燃焼させる際に当該燃焼装置から排出される排ガス中に含まれる有害物質を除去する排ガス処理方法であって、化石燃料を前記燃焼装置に供給して燃焼させ、前記燃焼装置からの煙道に配置した脱塵部の上流側近傍に塩化水素吸着剤を供給して過剰な塩化水素を吸着させ、前記塩化水素を吸着した塩化水素吸着剤を前記脱塵部で煤塵とともに捕集する構成としたことを特徴としており、この排ガス処理方法の構成を前述した従来の課題を解決するための手段としている。   The invention according to claim 1 of the present invention is an exhaust gas treatment method for removing harmful substances contained in exhaust gas discharged from a combustion apparatus when fossil fuel such as coal is burned by a combustion apparatus such as a boiler. The fossil fuel is supplied to the combustion device for combustion, and a hydrogen chloride adsorbent is supplied to the vicinity of the upstream side of the dedusting section disposed in the flue from the combustion device to adsorb excess hydrogen chloride, and the chloride The hydrogen chloride adsorbent that has adsorbed hydrogen is configured to be collected together with soot and dust in the dedusting section, and the configuration of this exhaust gas treatment method is a means for solving the above-described conventional problems.

本発明の請求項２に係る発明は、石炭などの化石燃料をボイラなどの燃焼装置で燃焼させる際に当該燃焼装置から排出される排ガス中に含まれる水銀を除去する排ガス処理方法であって、粉砕した化石燃料及び塩素化合物を前記燃焼装置に供給して燃焼させ、前記燃焼装置からの煙道に配置した脱塵部の上流側近傍に塩化水素吸着剤を供給して過剰な塩化水素を吸着させ、前記塩化水素を吸着した塩化水素吸着剤を前記脱塵部で煤塵とともに捕集する構成としたことを特徴としており、この排ガス処理方法の構成を前述した従来の課題を解決するための手段としている。   The invention according to claim 2 of the present invention is an exhaust gas treatment method for removing mercury contained in exhaust gas discharged from a combustion device when fossil fuel such as coal is burned in a combustion device such as a boiler, The crushed fossil fuel and chlorine compound are supplied to the combustion device and burned, and a hydrogen chloride adsorbent is supplied near the upstream side of the dedusting section disposed in the flue from the combustion device to adsorb excess hydrogen chloride. The hydrogen chloride adsorbent that has adsorbed the hydrogen chloride is collected together with soot and dust in the dedusting section, and the configuration of this exhaust gas treatment method is a means for solving the above-described conventional problems It is said.

本発明の請求項３に係る発明は、前記脱塵部で煤塵とともに捕集された前記塩化水素を吸着した塩化水素吸着剤を煤塵積層灰とともに前記燃焼装置に戻して燃焼させる構成としている。
本発明の請求項４に係る発明は、前記化石燃料及び塩素化合物を一緒に粉砕混合して成る混合物を前記燃焼装置に供給して燃焼させる構成としている。 The invention according to claim 3 of the present invention is configured such that the hydrogen chloride adsorbent adsorbing the hydrogen chloride collected together with the soot dust in the dust removing section is returned to the combustion device together with the soot dust ash and burned.
The invention according to claim 4 of the present invention is configured such that a mixture obtained by pulverizing and mixing the fossil fuel and the chlorine compound together is supplied to the combustion device and combusted.

本発明の請求項５に係る発明は、前記化石燃料及び塩素化合物を個々に粉砕し、粉砕した化石燃料を前記燃焼装置に供給すると共に、前記燃焼装置に用いる二次燃焼用空気をキャリヤとして粉砕した塩素化合物を前記燃焼装置に供給して燃焼させる構成としている。
この場合、塩素化合物としては、ＣａＣｌ２やＮａＣｌやＮＨ４Ｃｌなどの化合物が挙げられる。一般的に販売されているＣａＣｌ２では、純度が高いほど粉末状になり、純度が低いほど大きな累状やフレーク状になるが、純度の低いフレーク状のものも粉砕が可能である。なお、ＮＨ４Ｃｌでは、粉末状の試薬だけでなく、安価な鉱物（塩化アンモン石）を直接利用することができる。 According to a fifth aspect of the present invention, the fossil fuel and the chlorine compound are individually pulverized, and the pulverized fossil fuel is supplied to the combustion device, and the secondary combustion air used in the combustion device is pulverized as a carrier. The configured chlorine compound is supplied to the combustion device and burned.
In this case, examples of the chlorine compound include compounds such as CaCl 2 , NaCl, and NH 4 Cl. In general, CaCl 2 that is sold becomes powdery as the purity increases, and becomes larger and flakes as the purity decreases. However, flakes with low purity can be pulverized. In NH 4 Cl, not only a powdery reagent but also an inexpensive mineral (ammonite chloride) can be directly used.

また、塩化水素吸着剤としては、消石灰や重曹が挙げられる。
さらに、粉砕して得られる塩素化合物の粒子の大きさは、分解効果を促進するために、２００メッシュ（７５μｍ）の通過割合を７０〜８０％とすることが望ましく、１００メッシュ（１５０μｍ）の通過割合を９０％前後とすることが望ましい。
さらにまた、燃焼装置に供給する塩素化合物の量は、Ｈｇ０の酸化効率を上昇させるべく、化石燃料、例えば、石炭に含有される塩素濃度に基づいて決定する。この際、例えば、脱硝触媒上でのＨｇ０の転換反応は、ＮＨ３の共存により強い阻害を受けることがわかっている。これは、触媒表面の活性金属（Ｖ）に、ＮＨ３が優先的に吸着してしまい、Ｈｇ０の転換に必要なＨＣｌの吸着を阻害するからである。したがって、燃焼装置に供給する塩素化合物の量は、塩素濃度に加えて、脱硝部に供給するＮＨ３の量も考慮する。 Examples of the hydrogen chloride adsorbent include slaked lime and sodium bicarbonate.
Furthermore, the particle size of the chlorinated compound obtained by pulverization is preferably 70 to 80% for the passage rate of 200 mesh (75 μm), and the passage of 100 mesh (150 μm) in order to promote the decomposition effect. It is desirable that the ratio be around 90%.
Furthermore, the amount of chlorine compounds is supplied to the combustion apparatus, in order to increase the oxidation efficiency of Hg 0, fossil fuels, for example, be determined based on the concentration of chlorine contained in coal. At this time, for example, it has been found that the conversion reaction of Hg 0 on the denitration catalyst is strongly inhibited by the coexistence of NH 3 . This is the active metal (V) of the catalyst surface, NH 3 ends up preferentially adsorbed, because inhibits adsorption of HCl necessary for the conversion of Hg 0. Therefore, the amount of the chlorine compound supplied to the combustion apparatus takes into account the amount of NH 3 supplied to the denitration unit in addition to the chlorine concentration.

一方、本発明の請求項６に係る発明は、石炭などの化石燃料をボイラなどの燃焼装置で燃焼させる際に当該燃焼装置から排出される排ガス中に含まれる有害物質を除去する排ガス処理装置であって、前記燃焼装置からの煙道に配置された脱塵部と、前記脱塵部の上流側近傍に配置されて、過剰な塩化水素を吸着させるべく塩化水素吸着剤を前記燃焼装置から排出される排ガスに供給する塩化水素吸着剤供給部を備えている構成としている。   On the other hand, the invention according to claim 6 of the present invention is an exhaust gas treatment device for removing harmful substances contained in exhaust gas discharged from a combustion device when fossil fuel such as coal is burned by a combustion device such as a boiler. A dedusting portion disposed in the flue from the combustion device, and an upstream portion of the dedusting portion, and a hydrogen chloride adsorbent is discharged from the combustion device to adsorb excess hydrogen chloride. It is set as the structure provided with the hydrogen chloride adsorbent supply part which supplies to the waste gas to be made.

本発明の請求項７に係る発明は、石炭などの化石燃料をボイラなどの燃焼装置で燃焼させる際に当該燃焼装置から排出される排ガス中に含まれる水銀を除去する排ガス処理装置であって、粉砕した化石燃料及び塩素化合物を前記燃焼装置に供給する供給部と、前記燃焼装置からの煙道に配置された脱塵部と、前記脱塵部の上流側近傍に配置されて、過剰な塩化水素を吸着させるべく塩化水素吸着剤を前記燃焼装置から排出される排ガスに供給する塩化水素吸着剤供給部を備えている構成としている。   The invention according to claim 7 of the present invention is an exhaust gas treatment apparatus that removes mercury contained in exhaust gas discharged from the combustion apparatus when fossil fuel such as coal is burned in a combustion apparatus such as a boiler, A supply unit for supplying the pulverized fossil fuel and chlorine compound to the combustion device, a dedusting unit disposed in a flue from the combustion device, and an upstream side of the dedusting unit are provided with excess chloride. A hydrogen chloride adsorbent supply unit that supplies the hydrogen chloride adsorbent to the exhaust gas discharged from the combustion device to adsorb hydrogen is employed.

本発明の請求項８に係る発明は、前記脱塵部で煤塵とともに捕集された前記塩化水素を吸着した塩化水素吸着剤を煤塵積層灰とともに前記燃焼装置に戻す返還路を備えている構成としている。
本発明の請求項９に係る発明において、前記供給部は、前記化石燃料及び塩素化合物を一緒に粉砕混合して前記燃焼装置に供給するミルを具備している構成としている。 The invention according to claim 8 of the present invention includes a return path for returning the hydrogen chloride adsorbent adsorbing the hydrogen chloride collected together with the soot dust in the dust removing unit to the combustion device together with the soot stack ash. Yes.
In the invention according to claim 9 of the present invention, the supply section includes a mill that pulverizes and mixes the fossil fuel and the chlorine compound together and supplies them to the combustion device.

本発明の請求項１０に係る発明において、前記供給部は、前記化石燃料を粉砕して前記燃焼装置に供給する燃料用ミルと、塩素化合物を粉砕する化合物用ミルと、粉砕した塩素化合物を前記化合物用ミルから前記燃焼装置に用いる二次燃焼用空気の流路に導く導入路を具備している構成としている。
本発明の排ガス処理方法及び排ガス処理装置において、燃焼装置から湿式脱硫部に至るまでの煙道には、通常、脱硝部や脱塵部が順次配置され、脱硝部内（及び煙道中）に存在する未燃炭素分や灰分の表面などで、Ｈｇ０とＨＣｌとを反応させてＨｇＣｌ２に酸化させる。 In the invention according to claim 10 of the present invention, the supply unit pulverizes the fossil fuel and supplies it to the combustion device, a compound mill for pulverizing a chlorine compound, and a pulverized chlorine compound as the pulverized chlorine compound. It is configured to have an introduction path that leads from the compound mill to the flow path of the secondary combustion air used in the combustion apparatus.
In the exhaust gas treatment method and the exhaust gas treatment apparatus of the present invention, the flue from the combustion device to the wet desulfurization unit is usually arranged with a denitration unit and a dedusting unit in sequence, and exists in the denitration unit (and in the flue). On the surface of unburned carbon or ash, Hg 0 and HCl are reacted to oxidize to HgCl 2 .

本発明の請求項１に係る排ガス処理方法及び請求項６に係る排ガス処理装置では、上記した構成としているので、化石燃料、例えば、石炭をボイラなどの燃焼装置によって燃焼させる際に、石炭の種類や燃焼装置から排出される排ガスの性状にかかわりなく、有害物質を除去することが可能であり、加えて、例えば、水銀除去用のＨＣｌが排ガス中に過剰に含まれる場合であったとしても、煙道が腐食するなどといった不具合が生じるのを阻止することができるという非常に優れた効果がもたらされる。   The exhaust gas treatment method according to claim 1 of the present invention and the exhaust gas treatment apparatus according to claim 6 have the above-described configuration. Therefore, when fossil fuel, for example, coal is burned by a combustion device such as a boiler, the type of coal It is possible to remove harmful substances regardless of the nature of the exhaust gas discharged from the combustion apparatus and, in addition, even if, for example, HCl for mercury removal is excessively contained in the exhaust gas, A very good effect is obtained that it is possible to prevent the occurrence of problems such as corrosion of the flue.

また、本発明の請求項２に係る排ガス処理方法及び請求項７に係る排ガス処理装置では、上記した構成としていることから、化石燃料、例えば、石炭をボイラなどの燃焼装置によって燃焼させる際に、例えば、水銀の除去に吸着剤を用いない分だけランニングコスト少なく抑えることができるうえ、排ガス中のＨＣｌ濃度などのガス性状により水銀捕集効率が変化することもない。   In addition, since the exhaust gas treatment method according to claim 2 of the present invention and the exhaust gas treatment device according to claim 7 have the above-described configuration, when fossil fuel, for example, coal is burned by a combustion device such as a boiler, For example, the running cost can be reduced as much as no adsorbent is used to remove mercury, and the mercury collection efficiency does not change due to gas properties such as HCl concentration in the exhaust gas.

つまり、石炭の種類や燃焼装置から排出される排ガスの性状にかかわりなく、水銀を高効率且つ低コストで除去することが可能であり、加えて、例えば、水銀除去用のＨＣｌが排ガス中に過剰に含まれる場合であったとしても、煙道が腐食するなどといった不具合が生じるのを阻止することができるという非常に優れた効果がもたらされる。
さらに、本発明の請求項３に係る排ガス処理方法及び請求項８に係る排ガス処理装置では、上記した構成としているので、低コスト化に貢献することができるという非常に優れた効果がもたらされる。 In other words, it is possible to remove mercury with high efficiency and low cost regardless of the type of coal and the nature of the exhaust gas discharged from the combustion device. In addition, for example, HCl for removing mercury is excessive in the exhaust gas. Even if it is included in the case, it is possible to prevent the occurrence of problems such as corrosion of the flue, which is very excellent.
Furthermore, since the exhaust gas treatment method according to claim 3 of the present invention and the exhaust gas treatment apparatus according to claim 8 have the above-described configuration, a very excellent effect of being able to contribute to cost reduction is brought about.

さらにまた、本発明の請求項４に係る排ガス処理方法及び請求項９に係る排ガス処理装置では、上記した構成としたから、化石燃料及び塩素化合物の微粉末状の混合物を燃焼装置のバーナノズルに供給して、高温下で一気に気化分解させることができるので、ガス状のＨＣｌを効率よく生成させることが可能である。
さらにまた、本発明の請求項５に係る排ガス処理方法及び請求項１０に係る排ガス処理装置では、塩素化合物の固体をミルで粉砕し、燃焼装置に用いる二段燃焼用空気を用いて微粉状の塩素化合物を燃焼装置に導入するようにしているので、塩素化合物を供給するための機構の追加が少なくて済むという効果が得られる。 Furthermore, since the exhaust gas treatment method according to claim 4 and the exhaust gas treatment apparatus according to claim 9 of the present invention are configured as described above, a fine powdery mixture of fossil fuel and chlorine compound is supplied to the burner nozzle of the combustion apparatus. In addition, since it can be vaporized and decomposed at a high temperature under high temperature, gaseous HCl can be efficiently generated.
Furthermore, in the exhaust gas treatment method according to claim 5 and the exhaust gas treatment apparatus according to claim 10 of the present invention, the solid of the chlorine compound is pulverized by a mill and finely powdered using the two-stage combustion air used in the combustion device. Since the chlorine compound is introduced into the combustion apparatus, the effect of adding less mechanism for supplying the chlorine compound can be obtained.

以下、本発明の実施形態を図面に基づいて説明する。
図１及び図２は、本発明の一実施形態による排ガス処理装置を示しており、この実施形態では、本発明の排ガス処理方法及び排ガス処理装置を石炭焚きボイラ（燃焼装置）から排出される排ガスの処理に適用した場合を例に挙げて説明する。
図１に示すように、この排ガス処理装置１は、石炭焚きボイラＢから煙突２に至るまでの煙道Ｒに順次配置した脱硝部３、エアヒータ４、脱塵部５、熱交換器６、脱硫部７及び熱交換器８を備えているほか、化石燃料としての石炭Ｃ及び塩素化合物Ｃｌを石炭焚きボイラＢに供給する供給部を備えており、この供給部は、図２に示すように、石炭Ｃ及び塩素化合物Ｃｌを一緒に粉砕混合して石炭焚きボイラＢに供給するミル９としている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an exhaust gas treatment apparatus according to an embodiment of the present invention. In this embodiment, the exhaust gas treatment method and the exhaust gas treatment apparatus of the present invention are exhausted from a coal-fired boiler (combustion device). A case where this is applied to the process will be described as an example.
As shown in FIG. 1, the exhaust gas treatment apparatus 1 includes a denitration unit 3, an air heater 4, a dedusting unit 5, a heat exchanger 6, a desulfurization unit, which are sequentially arranged in a flue R from a coal burning boiler B to a chimney 2. 2 and a heat exchanger 8, as well as a supply unit for supplying coal C as a fossil fuel and a chlorine compound Cl to the coal-fired boiler B. As shown in FIG. The mill 9 is configured such that coal C and a chlorine compound Cl are pulverized and mixed together and supplied to the coal-fired boiler B.

また、この排ガス処理装置１は、脱塵部５の上流側近傍に配置されて、過剰な塩化水素ＨＣｌを吸着させるべく塩化水素吸着剤を石炭焚きボイラＢから排出される排ガスに供給する塩化水素吸着剤供給部１０を備えていると共に、脱塵部５で煤塵とともに捕集された塩化水素を吸着した塩化水素吸着剤を煤塵積層灰とともに石炭焚きボイラＢに戻す返還路５ａを備えている。   Further, the exhaust gas treatment apparatus 1 is arranged in the vicinity of the upstream side of the dust removing unit 5 and supplies hydrogen chloride adsorbent to the exhaust gas discharged from the coal-fired boiler B so as to adsorb excess hydrogen chloride HCl. In addition to the adsorbent supply unit 10, the adsorbent supply unit 10 includes a return path 5a for returning the hydrogen chloride adsorbent that has adsorbed the hydrogen chloride collected together with the dust in the dust removing unit 5 to the coal-fired boiler B together with the dust ash.

つまり、水銀除去用の塩化水素ＨＣｌが排ガス中に過剰に含まれる場合であったとしても、煙道Ｒが腐食するなどといった不具合が生じるのを阻止することができ、加えて、塩素を再利用することにより、低コスト化に寄与することができるようにしている。
この場合、煙道Ｒにおける脱硝部３の上流側にアンモニアを添加して、排ガスに含まれるＮＯＸを還元して窒素と水に変換するようにしている。
さらに、脱硝部３内及び煙道Ｒ中において、存在する未燃炭素分や灰分の表面などで、金属水銀Ｈｇ０とＨＣｌとを反応させて水溶性の２価水銀Ｈｇ２＋（ＨｇＣｌ２）に酸化させるようにしている。 In other words, even if hydrogen chloride HCl for removing mercury is excessively contained in the exhaust gas, it is possible to prevent problems such as corrosion of the flue R and to recycle chlorine. By doing so, it is possible to contribute to cost reduction.
In this case, by adding ammonia to the upstream side of the denitration unit 3 in the flue R, so that converted by reducing NO X contained in the exhaust gas to nitrogen and water.
Further, in the denitration unit 3 and in the flue R, metallic mercury Hg 0 and HCl are reacted with each other on the surface of unburned carbon and ash present to form water-soluble divalent mercury Hg 2+ (HgCl 2 ). I try to oxidize.

そして、湿式脱硫部７において、脱塵部５を通過した２価水銀Ｈｇ２＋（ＨｇＣｌ２）を液相吸収し、汚泥中に取り込んで捕集するようにしている。
この排ガス処理装置１では、予めミル９によって石炭Ｃ及び塩素化合物Ｃｌを一緒に粉砕混合し、その混合物を石炭焚きボイラＢに供給して燃焼を開始させる。そして、石炭焚きボイラＢから排出される排ガスの処理を行う場合には、まず、煙道Ｒにおける脱硝部３の上流側にアンモニアを添加して、排ガスに含まれるＮＯＸを還元して窒素と水に変換する。 Then, the wet desulfurization unit 7, divalent mercury Hg 2+ which has passed through the dedusted section 5 (HgCl 2) and a liquid phase absorption, so that collecting incorporate in the sludge.
In this exhaust gas treatment apparatus 1, coal C and chlorine compound Cl are pulverized and mixed together in advance by a mill 9, and the mixture is supplied to a coal-fired boiler B to start combustion. When performing the processing of the exhaust gas discharged from a coal-fired boiler B, first, by adding ammonia to the upstream side of the denitration unit 3 in the flue R, and nitrogen by reducing NO X contained in the exhaust gas Convert to water.

上記石炭焚きボイラＢから排出される排ガス中に含まれる水銀のうち、金属水銀Ｈｇ０は、脱硝部３内及び煙道Ｒ中に存在する未燃炭素分や灰分の表面などで、ＨＣｌと反応して水溶性の２価水銀Ｈｇ２＋（ＨｇＣｌ２）に変換される。
ここで、排ガス中に過剰な量の塩化水素ＨＣｌが含まれる場合には、脱硝部３の下流に位置する塩化水素吸着剤供給部１０から煙道Ｒに対して塩化水素吸着剤を供給して、過剰な塩化水素ＨＣｌを吸着する。 Among mercury contained in exhaust gas discharged from the coal-fired boiler B, metallic mercury Hg 0 is like the surface of the unburned carbon and ash present in the denitration unit 3 in and flue R, HCl reaction Thus, it is converted into water-soluble divalent mercury Hg 2+ (HgCl 2 ).
Here, when an excessive amount of hydrogen chloride HCl is contained in the exhaust gas, the hydrogen chloride adsorbent is supplied to the flue R from the hydrogen chloride adsorbent supply unit 10 located downstream of the denitration unit 3. Adsorb excess hydrogen chloride HCl.

次いで、脱塵部５では、２価水銀Ｈｇ２＋及び塩化水素ＨＣｌを吸着した塩化水素吸着剤を煤塵とともに捕集し、この脱塵部５で煤塵とともに捕集された塩化水素ＨＣｌを吸着した塩化水素吸着剤は、煤塵積層灰とともに返還路５ａを介して石炭焚きボイラＢに戻される。
湿式脱硫部７では、上記脱塵部５を通過した２価水銀Ｈｇ２＋（ＨｇＣｌ２）を液相で吸収して汚泥中に取り込んで捕集し、この後、水銀を含んだ汚泥を産業廃棄物として廃棄処理するようにしている。 Next, in the dust removing section 5, the hydrogen chloride adsorbent that adsorbs divalent mercury Hg 2+ and hydrogen chloride HCl is collected together with soot dust, and in this dust removing section 5, the chloride chloride that has absorbed hydrogen chloride HCl collected together with soot dust is collected. The hydrogen adsorbent is returned to the coal fired boiler B through the return path 5a together with the dust laminated ash.
In the wet desulfurization unit 7, the divalent mercury Hg 2+ (HgCl 2 ) that has passed through the dedusting unit 5 is absorbed in the liquid phase and collected in the sludge, and then the mercury-containing sludge is industrially discarded. They are disposed of as waste.

上記したように、この実施形態の排ガス処理方法及び排ガス処理装置１では、石炭Ｃを石炭焚きボイラＢによって燃焼させる際に、水銀の除去に吸着剤を用いていないので、その分だけランニングコスト少なく抑えることができ、加えて、排ガス中のＨＣｌ濃度などのガス性状により水銀捕集効率が変化することもない。
したがって、石炭Ｃの種類や排ガスの性状にかかわりなく、水銀を高効率且つ低コストで除去し得ることとなり、水銀を含んだ汚泥を産業廃棄物として廃棄処理するので、除去した水銀の管理が容易なものになる。 As described above, in the exhaust gas treatment method and the exhaust gas treatment apparatus 1 of this embodiment, when the coal C is burned by the coal-fired boiler B, the adsorbent is not used for removing mercury. In addition, the mercury collection efficiency does not change due to gas properties such as HCl concentration in the exhaust gas.
Therefore, regardless of the type of coal C and the nature of the exhaust gas, mercury can be removed with high efficiency and low cost, and the sludge containing mercury is disposed of as industrial waste, making it easy to manage the removed mercury. It will be something.

加えて、水銀除去用の塩化水素ＨＣｌが排ガス中に過剰に含まれる場合であったとしても、煙道Ｒが腐食したり、湿式脱硫部７の性能低下を招いたりするなどといった不具合が生じるのを阻止することができる。
さらに、この実施形態の排ガス処理方法及び排ガス処理装置１では、石炭Ｃ及び塩素化合物Ｃｌの微粉末状の混合物を石炭焚きボイラＢのバーナノズルに供給するようにしているので、高温下で一気に気化分解させることができ、ガス状の塩化水素ＨＣｌを効率よく生成させることが可能である。 In addition, even if hydrogen chloride HCl for removing mercury is excessively contained in the exhaust gas, the flue R is corroded or the performance of the wet desulfurization section 7 is deteriorated. Can be prevented.
Furthermore, in the exhaust gas treatment method and the exhaust gas treatment apparatus 1 of this embodiment, since a finely powdered mixture of coal C and chlorine compound Cl is supplied to the burner nozzle of the coal fired boiler B, it is vaporized and decomposed at a high temperature at a stretch. It is possible to efficiently produce gaseous hydrogen chloride HCl.

図３は、本発明の他の実施形態による排ガス処理装置を示しており、この実施形態の排ガス処理装置１１が先の排ガス処理装置１と異なるところは、供給部が、石炭Ｃを粉砕して石炭焚きボイラＢに供給する燃料用ミル１９Ａと、塩素化合物Ｃｌを粉砕する化合物用ミル１９Ｂと、粉砕した塩素化合物Ｃｌを化合物用ミル１９Ｂから石炭焚きボイラＢに用いる二次燃焼用空気Ａの流路に導く導入路２０を具備している点にあり、この実施形態の排ガス処理装置１１では、石炭Ｃ及び塩素化合物Ｃｌを個々に粉砕し、粉砕した石炭Ｃを石炭焚きボイラＢに供給すると共に、この石炭焚きボイラＢに用いる二次燃焼用空気Ａをキャリヤとして粉砕した塩素化合物Ｃｌを石炭焚きボイラＢに供給して燃焼させるようにしている。   FIG. 3 shows an exhaust gas treatment apparatus according to another embodiment of the present invention. The difference between the exhaust gas treatment apparatus 11 of this embodiment and the previous exhaust gas treatment apparatus 1 is that the supply unit pulverizes coal C. Fuel mill 19A for supplying to coal-fired boiler B, compound mill 19B for pulverizing chlorine compound Cl, and flow of secondary combustion air A for using pulverized chlorine compound Cl from compound mill 19B to coal-fired boiler B In the exhaust gas treatment device 11 of this embodiment, the coal C and the chlorine compound Cl are individually pulverized, and the pulverized coal C is supplied to the coal-fired boiler B. The chlorine compound Cl pulverized using the secondary combustion air A used in the coal-fired boiler B as a carrier is supplied to the coal-fired boiler B for combustion.

この排ガス処理装置１１においても、石炭Ｃの種類や排ガスの性状にかかわりなく、水銀を高効率且つ低コストで除去し得ることとなり、加えて、水銀除去用の塩化水素ＨＣｌが排ガス中に過剰に含まれる場合であったとしても、煙道Ｒが腐食したり、湿式脱硫部７の性能低下を招いたりするなどといった不具合が生じるのを阻止することができる。
また、この排ガス処理装置１１では、石炭焚きボイラＢに用いる二段燃焼用空気Ａを用いて微粉状の塩素化合物Ｃｌを石炭焚きボイラＢに導入するようにしているので、塩素化合物Ｃｌを供給するための機構の追加が少なくて済む。 In this exhaust gas treatment device 11 as well, mercury can be removed with high efficiency and low cost regardless of the type of coal C and the nature of the exhaust gas. In addition, the hydrogen chloride HCl for removing mercury is excessive in the exhaust gas. Even if it is included, it is possible to prevent problems such as the flue R corroding or causing the performance of the wet desulfurization section 7 to deteriorate.
Further, in the exhaust gas treatment apparatus 11, since the finely divided chlorine compound Cl is introduced into the coal-fired boiler B using the two-stage combustion air A used in the coal-fired boiler B, the chlorine compound Cl is supplied. Therefore, it is possible to reduce the number of additional mechanisms.

本発明の一実施形態による排ガス処理装置を示す概略構成説明図である。BRIEF DESCRIPTION OF THE DRAWINGS It is schematic structure explanatory drawing which shows the waste gas processing apparatus by one Embodiment of this invention. 図１の排ガス処理装置の供給部を拡大して示す部分拡大説明図である。It is a partial expansion explanatory drawing which expands and shows the supply part of the exhaust gas processing apparatus of FIG. 本発明の他の実施形態による排ガス処理装置の供給部を拡大して示す部分拡大説明図である。It is a partial expanded explanatory view which expands and shows the supply part of the exhaust gas processing apparatus by other embodiment of this invention.

符号の説明Explanation of symbols

１，１１ 排ガス処理装置
３ 脱硝部
５ 脱塵部
５ａ 返還路
７ 脱硫部
９ ミル（供給部）
１０ 塩化水素吸着剤供給部
１９Ａ 燃料用ミル（供給部）
１９Ｂ 化合物用ミル（供給部）
２０ 導入路（供給部）
Ａ 二段燃焼用空気
Ｂ 石炭焚きボイラ（燃焼装置）
Ｃ 石炭（化石燃料）
Ｃｌ 塩素化合物
Ｒ 煙道 1,11 Exhaust gas treatment equipment 3 Denitration part 5 Dedusting part 5a Return path 7 Desulfurization part 9 Mil (supply part)
10 Hydrogen chloride adsorbent supply section 19A Fuel mill (supply section)
19B Compound Mill (Supplying Section)
20 Introduction route (supply section)
A Two-stage combustion air B Coal-fired boiler (combustion device)
C Coal (fossil fuel)
Cl Chlorine compound R Flue

Claims (10)

石炭などの化石燃料をボイラなどの燃焼装置で燃焼させる際に当該燃焼装置から排出される排ガス中に含まれる有害物質を除去する排ガス処理方法であって、
化石燃料を前記燃焼装置に供給して燃焼させ、前記燃焼装置からの煙道に配置した脱塵部の上流側近傍に塩化水素吸着剤を供給して過剰な塩化水素を吸着させ、前記塩化水素を吸着した塩化水素吸着剤を前記脱塵部で煤塵とともに捕集することを特徴とする排ガス処理方法。 An exhaust gas treatment method for removing harmful substances contained in exhaust gas discharged from a combustion device when fossil fuel such as coal is burned in a combustion device such as a boiler,
The fossil fuel is supplied to the combustion device and combusted, and a hydrogen chloride adsorbent is supplied to the vicinity of the upstream side of the dedusting portion disposed in the flue from the combustion device to adsorb excess hydrogen chloride, and the hydrogen chloride A method for treating exhaust gas, comprising collecting a hydrogen chloride adsorbent adsorbing methane together with soot dust in the dedusting section. 石炭などの化石燃料をボイラなどの燃焼装置で燃焼させる際に当該燃焼装置から排出される排ガス中に含まれる水銀を除去する排ガス処理方法であって、
粉砕した化石燃料及び塩素化合物を前記燃焼装置に供給して燃焼させ、前記燃焼装置からの煙道に配置した脱塵部の上流側近傍に塩化水素吸着剤を供給して過剰な塩化水素を吸着させ、前記塩化水素を吸着した塩化水素吸着剤を前記脱塵部で煤塵とともに捕集することを特徴とする排ガス処理方法。 An exhaust gas treatment method for removing mercury contained in exhaust gas discharged from a combustion device when fossil fuel such as coal is burned in a combustion device such as a boiler,
The crushed fossil fuel and chlorine compound are supplied to the combustion device and burned, and a hydrogen chloride adsorbent is supplied near the upstream side of the dedusting section disposed in the flue from the combustion device to adsorb excess hydrogen chloride. And collecting the hydrogen chloride adsorbent adsorbing the hydrogen chloride together with soot dust in the dedusting section. 前記脱塵部で煤塵とともに捕集された前記塩化水素を吸着した塩化水素吸着剤を煤塵積層灰とともに前記燃焼装置に戻して燃焼させる請求項１又は２に記載の排ガス処理方法。   The exhaust gas treatment method according to claim 1 or 2, wherein the hydrogen chloride adsorbent that adsorbs the hydrogen chloride collected together with soot dust in the dust removing unit is returned to the combustion device together with the soot dust ash and burned. 前記化石燃料及び塩素化合物を一緒に粉砕混合して成る混合物を前記燃焼装置に供給して燃焼させる請求項１から３のいずれかに記載の排ガス処理方法。   The exhaust gas treatment method according to any one of claims 1 to 3, wherein a mixture obtained by pulverizing and mixing the fossil fuel and the chlorine compound is supplied to the combustion device and combusted. 前記化石燃料及び塩素化合物を個々に粉砕し、粉砕した化石燃料を前記燃焼装置に供給すると共に、前記燃焼装置に用いる二次燃焼用空気をキャリヤとして粉砕した塩素化合物を前記燃焼装置に供給して燃焼させる請求項１から３のいずれかに記載の排ガス処理方法。   The fossil fuel and the chlorine compound are individually pulverized, the pulverized fossil fuel is supplied to the combustion device, and the pulverized chlorine compound is supplied to the combustion device using the secondary combustion air used in the combustion device as a carrier. The exhaust gas treatment method according to any one of claims 1 to 3, wherein combustion is performed. 石炭などの化石燃料をボイラなどの燃焼装置で燃焼させる際に当該燃焼装置から排出される排ガス中に含まれる有害物質を除去する排ガス処理装置であって、
前記燃焼装置からの煙道に配置された脱塵部と、
前記脱塵部の上流側近傍に配置されて、過剰な塩化水素を吸着させるべく塩化水素吸着剤を前記燃焼装置から排出される排ガスに供給する塩化水素吸着剤供給部を備えている
ことを特徴とする排ガス処理装置。 An exhaust gas treatment device for removing harmful substances contained in exhaust gas discharged from a combustion device when fossil fuel such as coal is burned in a combustion device such as a boiler,
A dedusting section disposed in a flue from the combustion device;
A hydrogen chloride adsorbent supply unit that is disposed in the vicinity of the upstream side of the dedusting unit and supplies the hydrogen chloride adsorbent to the exhaust gas discharged from the combustion device in order to adsorb excess hydrogen chloride. Exhaust gas treatment equipment. 石炭などの化石燃料をボイラなどの燃焼装置で燃焼させる際に当該燃焼装置から排出される排ガス中に含まれる水銀を除去する排ガス処理装置であって、
粉砕した化石燃料及び塩素化合物を前記燃焼装置に供給する供給部と、
前記燃焼装置からの煙道に配置された脱塵部と、
前記脱塵部の上流側近傍に配置されて、過剰な塩化水素を吸着させるべく塩化水素吸着剤を前記燃焼装置から排出される排ガスに供給する塩化水素吸着剤供給部を備えている
ことを特徴とする排ガス処理装置。 An exhaust gas treatment device for removing mercury contained in exhaust gas discharged from a combustion device when fossil fuel such as coal is burned in a combustion device such as a boiler,
A supply unit for supplying pulverized fossil fuel and chlorine compound to the combustion device;
A dedusting section disposed in a flue from the combustion device;
A hydrogen chloride adsorbent supply unit that is disposed in the vicinity of the upstream side of the dedusting unit and supplies the hydrogen chloride adsorbent to the exhaust gas discharged from the combustion device in order to adsorb excess hydrogen chloride. Exhaust gas treatment equipment. 前記脱塵部で煤塵とともに捕集された前記塩化水素を吸着した塩化水素吸着剤を煤塵積層灰とともに前記燃焼装置に戻す返還路を備えている請求項６又は７に記載の排ガス処理装置。   The exhaust gas treatment apparatus according to claim 6 or 7, further comprising a return path for returning the hydrogen chloride adsorbent adsorbing the hydrogen chloride collected together with soot dust in the dust removing unit to the combustion apparatus together with soot stack ash. 前記供給部は、前記化石燃料及び塩素化合物を一緒に粉砕混合して前記燃焼装置に供給するミルを具備している請求項６〜８のいずれかに記載の排ガス処理装置。   The exhaust gas treatment apparatus according to any one of claims 6 to 8, wherein the supply unit includes a mill that pulverizes and mixes the fossil fuel and a chlorine compound together and supplies the pulverized fuel and the chlorine compound to the combustion apparatus. 前記供給部は、前記化石燃料を粉砕して前記燃焼装置に供給する燃料用ミルと、塩素化合物を粉砕する化合物用ミルと、粉砕した塩素化合物を前記化合物用ミルから前記燃焼装置に用いる二次燃焼用空気の流路に導く導入路を具備している請求項６〜８のいずれかに記載の排ガス処理装置。   The supply unit pulverizes the fossil fuel and supplies it to the combustion device, a compound mill for pulverizing a chlorine compound, and a secondary that uses the pulverized chlorine compound from the compound mill to the combustion device. The exhaust gas treatment apparatus according to any one of claims 6 to 8, further comprising an introduction path leading to a combustion air flow path.
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