JP6061285B2 - Cement kiln combustion exhaust gas treatment apparatus and treatment method - Google Patents

Cement kiln combustion exhaust gas treatment apparatus and treatment method Download PDF

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JP6061285B2
JP6061285B2 JP2012073076A JP2012073076A JP6061285B2 JP 6061285 B2 JP6061285 B2 JP 6061285B2 JP 2012073076 A JP2012073076 A JP 2012073076A JP 2012073076 A JP2012073076 A JP 2012073076A JP 6061285 B2 JP6061285 B2 JP 6061285B2
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exhaust gas
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cement kiln
dust
slaked lime
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小川 洋介
洋介 小川
泰之 石田
泰之 石田
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Taiheiyo Cement Corp
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Description

本発明は、セメントキルン燃焼排ガスの処理装置及び処理方法に関し、特に、セメントキルンの窯尻からプレヒータの最下段サイクロンに至るまでのキルン排ガス流路より燃焼ガスの一部を抽気し、塩素分等を除去する塩素バイパスシステムの排ガスを処理する装置及び方法に関する。   The present invention relates to a cement kiln combustion exhaust gas processing apparatus and processing method, and in particular, a part of combustion gas is extracted from a kiln exhaust gas passage from the kiln bottom of the cement kiln to the lowermost cyclone of the preheater, and the chlorine content, etc. The present invention relates to an apparatus and method for treating exhaust gas of a chlorine bypass system that removes water.

従来、セメント製造設備におけるプレヒータの閉塞等の問題を引き起こす原因となる塩素、硫黄、アルカリ等の中で、塩素が特に問題となることに着目し、セメントキルンの窯尻から最下段サイクロンに至るまでのキルン排ガス流路より、燃焼ガスの一部を抽気して塩素を除去する塩素バイパスシステムが用いられている。   Focusing on chlorine, sulfur, alkali, etc., which causes problems such as blockage of preheaters in cement manufacturing facilities, from the bottom of the kiln of the cement kiln to the bottom cyclone A chlorine bypass system for extracting a part of combustion gas and removing chlorine from the kiln exhaust gas flow path is used.

この塩素バイパスシステムでは、特許文献1に記載のように、抽気した燃焼ガスを冷却して生成したダストの微粉側に塩素が偏在しているため、ダストを分級機によって粗粉と微粉とに分離し、粗粉をセメントキルン系に戻すとともに、分離された塩化カリウム等を含む微粉(塩素バイパスダスト)を水洗して塩素を除去し、固液分離して得られた脱塩ケーキをセメント原料として利用していた。   In this chlorine bypass system, as described in Patent Document 1, since chlorine is unevenly distributed on the fine powder side of the dust generated by cooling the extracted combustion gas, the dust is separated into coarse powder and fine powder by a classifier. The coarse powder is returned to the cement kiln system, and the fine powder (chlorine bypass dust) containing the separated potassium chloride is washed with water to remove chlorine, and the desalted cake obtained by solid-liquid separation is used as the cement raw material. I was using it.

上記抽気した燃焼ガスには、一部の酸性ガス等が残留するため、抽気ガスをそのまま大気に排出することができず、セメントキルンに付設されているプレヒータやクリンカクーラ等に戻しても、硫黄等の微量成分は系外に排出されず、セメント製造工程内を循環しながら次第に濃縮し、工程トラブルを引き起こすことが知られている。   Since some of the acid gas and the like remain in the extracted combustion gas, the extracted gas cannot be discharged into the atmosphere as it is, and even if it is returned to the preheater or clinker cooler attached to the cement kiln, It is known that trace components such as are not discharged out of the system, but gradually concentrate while circulating in the cement manufacturing process, causing a process trouble.

そこで、上記抽気ガスを脱硫装置を通した後、セメントキルンの排気系へ送るか、特許文献2に記載のように、抽気ガスを湿式集塵装置で溶媒を用いて集塵し、ダストの回収と、抽気ガスの脱硫とを同時に行った後、脱硫後の清浄ガスを大気に放出していた。   Therefore, after the extraction gas passes through the desulfurization device, it is sent to the exhaust system of the cement kiln, or as described in Patent Document 2, the extraction gas is collected by a wet dust collector using a solvent, and the dust is recovered. In addition, the extraction gas was simultaneously desulfurized, and then the desulfurized clean gas was released to the atmosphere.

特開2004−330148号公報JP 2004-330148 A 特開2004−002143号公報JP 2004-002143 A

しかし、上記脱硫を兼ねた湿式集塵では大量の水を使用するため、水が高価な地域等では、湿式集塵装置等を導入することが困難である。   However, a large amount of water is used in the wet dust collection that also serves as the desulfurization. Therefore, it is difficult to introduce a wet dust collection device or the like in an area where water is expensive.

そこで、本発明は、上記従来の技術における問題点に鑑みてなされたものであって、大量の水を使用せずに塩素バイパスシステムの排ガスを処理することを目的とする。   Therefore, the present invention has been made in view of the problems in the above-described conventional technology, and an object thereof is to treat exhaust gas from a chlorine bypass system without using a large amount of water.

上記目的を達成するため、本発明は、セメントキルン燃焼排ガスの処理装置であって、セメントキルンの窯尻からプレヒータの最下段サイクロンに至るまでのキルン排ガス流路より燃焼排ガスの一部を冷却しながら抽気するプローブと、該プローブによる抽気ガスに水を噴霧し、該抽気ガス中の生石灰と水とで生成された消石灰と、該抽気ガス中のSO2とを反応させ、該抽気ガス中のSO2を除去する半乾式の脱硫装置としてのスプレー塔と、該スプレー塔の排ガスに含まれるダストを回収する集塵機と、該集塵機で回収されたダストを含むスラリーを、該ダストに含まれる生石灰から生成された消石灰スラリーと、石膏及び塩水とに分離するシックナーとを備え、前記スプレー塔において、前記シックナーで分離された消石灰スラリーを前記プローブによる抽気ガスに噴霧することを特徴とする。 In order to achieve the above object, the present invention is a cement kiln combustion exhaust gas treatment apparatus, which cools a part of combustion exhaust gas from a kiln exhaust gas passage from the kiln bottom of the cement kiln to the lowermost cyclone of the preheater. The probe bleeds while spraying water on the bleed gas by the probe, and reacts the slaked lime generated with quick lime and water in the bleed gas with SO 2 in the bleed gas, A spray tower as a semi-dry type desulfurization apparatus for removing SO 2 , a dust collector for collecting dust contained in the exhaust gas of the spray tower, and a slurry containing dust collected by the dust collector from quick lime contained in the dust A slaked lime slurry produced and a thickener that separates into gypsum and salt water. In the spray tower, the slaked lime slurry separated by the thickener is It sprays on the bleed gas by the probe.

そして、本発明によれば、スプレー塔で抽気ガスに水を噴霧して生成した消石灰と、抽気ガス中のSO2とを反応させてSO2を除去するため、大量の水を使用せずに抽気ガスを脱硫することが可能となる。また、シックナーで分離された消石灰スラリーをプローブによる抽気ガスに噴霧して有効利用し、分離された石膏及び塩水も各々有効利用することができる。 Then, according to the present invention, in order to remove the lime produced by spraying with water extracted gas with a spray tower, the SO 2 is reacted with SO 2 in the extracted gas, without using a large amount of water The extracted gas can be desulfurized. Further, the slaked lime slurry separated by the thickener can be effectively used by spraying it on the extraction gas by the probe, and the separated gypsum and salt water can also be used effectively.

上記処理装置は、前記プローブで抽気した抽気ガスを、粗粉と、微粉を含む排ガスとに分離する分級機を備え、該分級機から排出された微粉を含む排ガスを前記スプレー塔に供給することができる。   The said processing apparatus is equipped with the classifier which isolate | separates the extraction gas extracted with the said probe into coarse powder and the waste gas containing fine powder, and supplies the waste gas containing the fine powder discharged | emitted from this classifier to the said spray tower. Can do.

また、上記処理装置は、前記集塵機の排ガスを加熱する排ガス加熱手段と、前記スプレー塔に導入される抽気ガスを用い、前記排ガス加熱手段から供給された熱媒体を加熱する熱媒体加熱手段と、該熱媒体加熱手段で加熱された熱媒体を前記排ガス加熱手段に戻すルートとを備えることができる。これによって、熱損失を低く抑えながら効率よく集塵機の排ガスを加熱し、低い運転コストで排ガスを処理することができる。   Further, the processing apparatus includes an exhaust gas heating means for heating the exhaust gas of the dust collector, a heat medium heating means for heating a heat medium supplied from the exhaust gas heating means, using an extraction gas introduced into the spray tower, And a route for returning the heat medium heated by the heat medium heating means to the exhaust gas heating means. As a result, the exhaust gas of the dust collector can be efficiently heated while the heat loss is kept low, and the exhaust gas can be processed at a low operating cost.

上記処理装置において、前記集塵機を湿式電気集塵機とすることができ、半乾式脱硫後のダストを効率よく回収することができる。また、洗浄液もそのままシックナーに導入することができて効率のよいシステムを構成することができる。   In the said processing apparatus, the said dust collector can be used as a wet electric dust collector, and the dust after a semi-dry type desulfurization can be collect | recovered efficiently. Further, the cleaning liquid can be introduced into the thickener as it is, and an efficient system can be configured.

さらに、本発明は、セメントキルン燃焼排ガスの処理方法であって、セメントキルンの窯尻からプレヒータの最下段サイクロンに至るまでのキルン排ガス流路より燃焼排ガスの一部を抽気し、該抽気ガスに水を噴霧し、該抽気ガス中の生石灰と水とで生成された消石灰と、該抽気ガス中のSO2とを反応させ、該抽気ガス中のSO2を除去し、該SO2を除去した抽気ガスに含まれるダストを集塵し、該集塵したダストを含むスラリーを、該ダストに含まれる生石灰から生成された消石灰スラリーと、石膏及び塩水とに分離し、前記噴霧工程において、前記分離された消石灰スラリーを前記抽気ガスに噴霧することを特徴とする。本発明によれば、上記発明と同様に、大量の水を使用せずに抽気ガスを脱硫することができるとともに、分離した消石灰スラリー、石膏及び塩水を各々有効利用することができる。 Further, the present invention is a method for treating a cement kiln combustion exhaust gas, wherein a part of the combustion exhaust gas is extracted from a kiln exhaust gas passage from the bottom of the cement kiln to the bottom cyclone of the preheater, and the extracted gas sprayed with water, and slaked lime produced in the lime and water the bleed gas is reacted with SO 2 in the bleed gas to remove the SO 2 in the bleed gas to remove the SO 2 Dust contained in the extraction gas is collected, and the slurry containing the collected dust is separated into slaked lime slurry generated from quick lime contained in the dust, gypsum and salt water, and in the spraying step, the separation the slaked lime slurry is characterized by spraying to Rukoto the extracted gas. According to the present invention, similarly to the above invention, it is possible to desulfurize the extracted gas without using a large amount of water, separated slaked lime slurry, Ru can be each effectively utilized gypsum and brine.

以上のように、本発明によれば、大量の水を使用せずに、塩素バイパスシステムの排ガスを処理することが可能となる。   As described above, according to the present invention, it is possible to treat the exhaust gas of the chlorine bypass system without using a large amount of water.

本発明にかかるセメントキルン燃焼排ガスの処理装置の一実施の形態を示す全体構成図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram which shows one Embodiment of the processing apparatus of the cement kiln combustion exhaust gas concerning this invention.

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。   Next, an embodiment for carrying out the present invention will be described in detail with reference to the drawings.

図1は、本発明にかかるセメントキルン燃焼排ガスの処理装置の一実施の形態を示し、この装置1は、セメントキルン2の窯尻からプレヒータの最下段サイクロン(不図示)に至るまでのキルン排ガス流路より、燃焼排ガスの一部(図中符号G)を抽気するプローブ3と、プローブ3内に冷風Aを供給して抽気ガスG1を急冷する冷却ファン4と、抽気ガスG1に含まれるダストの粗粉D1を分離する分級機としてのサイクロン5と、排ガスG2の顕熱を回収する熱回収器6と、熱回収器6の排ガスG3に水等を噴霧するスプレー塔7と、スプレー塔7の排ガスG4から微粉(塩素バイパスダスト)D2を回収する湿式電気集塵機8と、湿式電気集塵機8から排出された微粉D2を含むスラリーを消石灰スラリーSと、石膏GYと塩水SWとに分離するシックナー9と、湿式電気集塵機8の排ガスG5を加熱する再加熱器10と、排気ファン11等で構成される。   FIG. 1 shows an embodiment of a treatment device for cement kiln combustion exhaust gas according to the present invention. This device 1 is a kiln exhaust gas from the kiln bottom of the cement kiln 2 to the lowermost cyclone (not shown) of the preheater. The probe 3 for extracting a part of the combustion exhaust gas (reference numeral G in the figure) from the flow path, the cooling fan 4 for supplying the cool air A into the probe 3 to quench the extracted gas G1, and the dust contained in the extracted gas G1 A cyclone 5 as a classifier for separating the coarse powder D1, a heat recovery unit 6 for recovering sensible heat of the exhaust gas G2, a spray tower 7 for spraying water or the like on the exhaust gas G3 of the heat recovery unit 6, and a spray tower 7 Wet electric dust collector 8 for recovering fine powder (chlorine bypass dust) D2 from the exhaust gas G4, and a slurry containing fine powder D2 discharged from the wet electric dust collector 8, slaked lime slurry S, gypsum GY and salt water SW A thickener 9 to separate, the reheater 10 for heating the exhaust gas G5 wet electrostatic precipitator 8, constituted by the exhaust fan 11 or the like.

プローブ3、冷却ファン4、サイクロン5及び排気ファン11は、従来の塩素バイパスシステムに用いられている装置であって、詳細説明を省略する。   The probe 3, the cooling fan 4, the cyclone 5, and the exhaust fan 11 are devices used in a conventional chlorine bypass system, and detailed description thereof is omitted.

熱回収器(熱媒体加熱手段)6は、サイクロン5の排ガスG2と再加熱器10からのガスG7との熱交換を行うものであり、サイクロン5の排ガスG2のガス温度を低下させると共に、排ガスG2から回収した熱を再加熱器10で利用するために設けられる。尚、サイクロン5の排ガスG2から熱を回収するにあたって、熱回収器6及び再加熱器10に代えてヒートパイプ、ユングストローム(登録商標)式熱交換器(アルストム株式会社製)、ガスガスヒータ等を用いることもできる。   The heat recovery device (heat medium heating means) 6 performs heat exchange between the exhaust gas G2 of the cyclone 5 and the gas G7 from the reheater 10, reduces the gas temperature of the exhaust gas G2 of the cyclone 5, and exhaust gas. The heat recovered from G2 is provided for use in the reheater 10. When recovering heat from the exhaust gas G2 of the cyclone 5, instead of the heat recovery device 6 and the reheater 10, a heat pipe, a Jungstrom (registered trademark) heat exchanger (manufactured by Alstom Co., Ltd.), a gas gas heater, etc. It can also be used.

スプレー塔7は、半乾式の脱硫装置であって、熱回収器6の排ガスG3に水を噴霧し、排ガスG3中の微粉に含まれる生石灰(CaO)から消石灰(Ca(OH)2)を生成すると共に、排ガスG3に、シックナー9から排出された消石灰スラリーSを噴霧し、スプレー塔7内で生成した消石灰と、シックナー9からの消石灰スラリーSとを排ガスG3中のSO2と反応させ、排ガスG3からSO2を除去するために備えられる。 The spray tower 7 is a semi-dry type desulfurization device, and sprays water on the exhaust gas G3 of the heat recovery unit 6 to generate slaked lime (Ca (OH) 2 ) from quick lime (CaO) contained in the fine powder in the exhaust gas G3. At the same time, the slaked lime slurry S discharged from the thickener 9 is sprayed onto the exhaust gas G3, and the slaked lime generated in the spray tower 7 and the slaked lime slurry S from the thickener 9 are reacted with SO 2 in the exhaust gas G3, Provided to remove SO 2 from G3.

湿式電気集塵機8は、排ガスG4から微粉D2を回収するために備えられ、集塵板等の洗浄に水Wが用いられる。特に、湿式荷電液滴(静電微粒化)電気集塵機等を用いると、より少ない水量で湿式集塵することができる。   The wet electric dust collector 8 is provided for recovering the fine powder D2 from the exhaust gas G4, and water W is used for cleaning the dust collecting plate and the like. In particular, when a wet charged droplet (electrostatic atomization) electrostatic precipitator or the like is used, wet dust collection can be performed with a smaller amount of water.

シックナー9は、湿式電気集塵機8から排出された微粉D2を含むスラリーを沈降分離するために備えられ、微粉D2に含まれる生石灰から生成される消石灰スラリーと、さらに反応が進んで、この消石灰が排ガスG3中のSO2と反応して生成される石膏GY及び塩水SWとに分離し、分離した消石灰スラリーSをスプレー塔7に戻すルートを備える。 The thickener 9 is provided to settle and separate the slurry containing the fine powder D2 discharged from the wet electrostatic precipitator 8, and the slaked lime slurry generated from quick lime contained in the fine powder D2 further proceeds with the reaction, and this slaked lime is exhausted. A route for separating the slaked lime slurry S separated into gypsum GY and salt water SW produced by reacting with SO 2 in G3 and returning to the spray tower 7 is provided.

再加熱器(燃焼排ガス加熱手段)10は、湿式電気集塵機8から排出された排ガスG5を加熱するために備えられる。   A reheater (combustion exhaust gas heating means) 10 is provided for heating the exhaust gas G5 discharged from the wet electrostatic precipitator 8.

次に、上記構成を有する処理装置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 processing apparatus 1 having the above configuration will be described with reference to FIG.

プローブ3で抽気された抽気ガスG1は、冷却ファン4からの冷風Aによって350〜550℃程度に冷却された後、サイクロン5に導入され、粗粉D1と、塩素分が偏在している微粉を含む排ガスG2とに分離される。ここで、粗粉D1は塩素含有量が少ないため、セメント原料系へ戻すことができる。   The extraction gas G1 extracted by the probe 3 is cooled to about 350 to 550 ° C. by the cold air A from the cooling fan 4 and then introduced into the cyclone 5 to remove coarse powder D1 and fine powder in which the chlorine content is unevenly distributed. It isolate | separates into the waste gas G2 containing. Here, since the coarse powder D1 has a low chlorine content, it can be returned to the cement raw material system.

サイクロン5から排出された微粉を含む排ガスG2は、熱回収器6において再加熱器10から導入されたガスと熱交換され、回収した熱を再加熱器10で利用する。   The exhaust gas G <b> 2 containing fine powder discharged from the cyclone 5 is heat-exchanged with the gas introduced from the reheater 10 in the heat recovery unit 6, and the recovered heat is used in the reheater 10.

次に、熱回収器6の排ガスG3は、スプレー塔7に導入され、微粉中の生石灰は、スプレー塔7内で噴霧された水と反応して消石灰となり、排ガスG2に含まれる硫黄分(SO2)は、この消石灰スラリーと下記のように反応して脱硫される。
CaO + H2O → Ca(OH)2
SO2 + Ca(OH)2 → CaSO3・1/2H2O + 1/2H2
CaSO3・1/2H2O + 1/2O2 + 3/2H2O → CaSO4・2H2
スプレー塔7の排ガスG4は、湿式電気集塵機8に導入され、微粉D2が回収される。湿式電気集塵機8から排出された微粉D2に含まれる生石灰は、シックナー9内で水と反応して消石灰スラリーSとなり、さらに反応が進むと消石灰スラリーSは、石膏GY及び塩水SWとなる。この際、比重の小さい消石灰スラリーSは上層に、比重の大きい石膏GY及び塩水SWは下層に分かれることで、沈降分離することができる。ここで生じた消石灰スラリーSをスプレー塔7での噴霧に使用することができる。さらに、石膏GYをセメントミル系へ添加したり、塩水SWから塩を回収後、排水処理して放流することができる。
Next, the exhaust gas G3 of the heat recovery unit 6 is introduced into the spray tower 7, and the quick lime in the fine powder reacts with the water sprayed in the spray tower 7 to become slaked lime, and the sulfur content (SO 2 ) is desulfurized by reacting with this slaked lime slurry as follows.
CaO + H 2 O → Ca (OH) 2
SO 2 + Ca (OH) 2 → CaSO 3 · 1 / 2H 2 O + 1 / 2H 2 O
CaSO 3 · 1 / 2H 2 O + 1 / 2O 2 + 3 / 2H 2 O → CaSO 4 · 2H 2 O
The exhaust gas G4 from the spray tower 7 is introduced into the wet electrostatic precipitator 8, and the fine powder D2 is collected. The quicklime contained in the fine powder D2 discharged from the wet electrostatic precipitator 8 reacts with water in the thickener 9 to become slaked lime slurry S. When the reaction further proceeds, the slaked lime slurry S becomes gypsum GY and salt water SW. At this time, the slaked lime slurry S having a small specific gravity can be separated into the upper layer, and the gypsum GY and the salt water SW having a large specific gravity can be separated into the lower layer by sedimentation. The slaked lime slurry S generated here can be used for spraying in the spray tower 7. Furthermore, gypsum GY can be added to the cement mill system, or salt can be recovered from the salt water SW and then discharged after being drained.

湿式電気集塵機8から排出された排ガスG5の温度は、熱回収器6での熱交換及びスプレー塔7での水の噴霧によって50〜150℃程度まで下がっているため、再加熱器10で100〜200℃程度まで昇温させる。再加熱器10の熱源には、上述のように、サイクロン5から排出された排ガスG2を用いる。   Since the temperature of the exhaust gas G5 discharged from the wet electrostatic precipitator 8 is lowered to about 50 to 150 ° C. by the heat exchange in the heat recovery unit 6 and the spray of water in the spray tower 7, it is 100 to 100 in the reheater 10. The temperature is raised to about 200 ° C. As described above, the exhaust gas G2 discharged from the cyclone 5 is used as the heat source of the reheater 10.

再加熱器10で昇温された排ガスG6は、排気ファン11及び図示しない煙突を経て大気に放出するか、別工程で排ガスG6から熱回収した後大気へ放出する。   The exhaust gas G6 heated by the reheater 10 is discharged to the atmosphere through the exhaust fan 11 and a chimney (not shown), or is recovered to the atmosphere after heat is recovered from the exhaust gas G6 in a separate process.

尚、上記実施の形態においては、湿式電気集塵機8を用いてスプレー塔7の排ガスG4に含まれる微粉D2を回収したが、湿式電気集塵機8に代えて、湿式集塵機(スクラバ)を用いることもできる。   In the above embodiment, the fine powder D2 contained in the exhaust gas G4 of the spray tower 7 is recovered using the wet electric dust collector 8. However, a wet dust collector (scrubber) can be used instead of the wet electric dust collector 8. .

1 セメントキルン燃焼排ガス処理装置
2 セメントキルン
3 プローブ
4 冷却ファン
5 サイクロン
6 熱回収器
7 スプレー塔
8 湿式電気集塵機
9 シックナー
10 再加熱器
11 排気ファン
D1 粗粉
D2 微粉
G 燃焼排ガスの一部
G1 抽気ガス
G2〜G6 排ガス
G7 ガス
GY 石膏
S 消石灰スラリー
SW 塩水
W 水
DESCRIPTION OF SYMBOLS 1 Cement kiln combustion exhaust gas processing apparatus 2 Cement kiln 3 Probe 4 Cooling fan 5 Cyclone 6 Heat recovery device 7 Spray tower 8 Wet electrostatic precipitator 9 Thickener 10 Reheater 11 Exhaust fan D1 Coarse powder D2 Fine powder G Part of combustion exhaust gas G1 Extraction Gas G2 to G6 Exhaust gas G7 Gas GY Gypsum S Slaked lime slurry SW Salt water W Water

Claims (5)

セメントキルンの窯尻からプレヒータの最下段サイクロンに至るまでのキルン排ガス流路より燃焼排ガスの一部を冷却しながら抽気するプローブと、
該プローブによる抽気ガスに水を噴霧し、該抽気ガス中の生石灰と水とで生成された消石灰と、該抽気ガス中のSO2とを反応させ、該抽気ガス中のSO2を除去する半乾式の脱硫装置としてのスプレー塔と、
該スプレー塔の排ガスに含まれるダストを回収する集塵機と、
該集塵機で回収されたダストを含むスラリーを、該ダストに含まれる生石灰から生成された消石灰スラリーと、石膏及び塩水とに分離するシックナーとを備え、
前記スプレー塔において、前記シックナーで分離された消石灰スラリーを前記プローブによる抽気ガスに噴霧することを特徴とするセメントキルン燃焼排ガスの処理装置。
A probe for extracting air while cooling a part of the combustion exhaust gas from the kiln exhaust gas flow path from the bottom of the kiln of the cement kiln to the lowermost cyclone of the preheater,
Half by spraying with water to bleed gas by the probe, and slaked lime produced in the lime and water the bleed gas is reacted with SO 2 in the bleed gas to remove SO 2 in the bleed gas A spray tower as a dry desulfurization device ;
A dust collector for collecting dust contained in the exhaust gas of the spray tower;
A slurry containing dust collected by the dust collector, a slaked lime slurry generated from quick lime contained in the dust, and a thickener for separating gypsum and salt water,
In the spray tower, the cement kiln combustion exhaust gas treatment apparatus is characterized in that the slaked lime slurry separated by the thickener is sprayed on the extracted gas by the probe.
前記プローブで抽気した抽気ガスを、粗粉と、微粉を含む排ガスとに分離する分級機を備え、
該分級機から排出された微粉を含む排ガスを前記スプレー塔に供給することを特徴とする請求項1に記載のセメントキルン燃焼排ガスの処理装置。
A classifier for separating the extracted gas extracted by the probe into coarse powder and exhaust gas containing fine powder,
2. The cement kiln combustion exhaust gas treatment apparatus according to claim 1, wherein exhaust gas containing fine powder discharged from the classifier is supplied to the spray tower.
前記集塵機の排ガスを加熱する排ガス加熱手段と、
前記スプレー塔に導入される抽気ガスを用い、前記排ガス加熱手段から供給された熱媒体を加熱する熱媒体加熱手段と、
該熱媒体加熱手段で加熱された熱媒体を前記排ガス加熱手段に戻すルートとを備えることを特徴とする請求項1又は2に記載のセメントキルン燃焼排ガスの処理装置。
Exhaust gas heating means for heating the exhaust gas of the dust collector;
A heating medium heating means for heating the heating medium supplied from the exhaust gas heating means, using an extraction gas introduced into the spray tower;
The cement kiln combustion exhaust gas treatment apparatus according to claim 1 or 2 , further comprising a route for returning the heat medium heated by the heat medium heating means to the exhaust gas heating means.
前記集塵機は、湿式電気集塵機であることを特徴とする請求項1、2又は3に記載のセメントキルン燃焼排ガスの処理装置。 4. The cement kiln combustion exhaust gas treatment apparatus according to claim 1 , wherein the dust collector is a wet electric dust collector. セメントキルンの窯尻からプレヒータの最下段サイクロンに至るまでのキルン排ガス流路より燃焼排ガスの一部を抽気し、
該抽気ガスに水を噴霧し、該抽気ガス中の生石灰と水とで生成された消石灰と、該抽気ガス中のSO2とを反応させ、該抽気ガス中のSO2を除去し、
該SO2を除去した抽気ガスに含まれるダストを集塵し、
該集塵したダストを含むスラリーを、該ダストに含まれる生石灰から生成された消石灰スラリーと、石膏及び塩水とに分離し、
前記噴霧工程において、前記分離された消石灰スラリーを前記抽気ガスに噴霧することを特徴とするセメントキルン燃焼排ガスの処理方法。
A part of the combustion exhaust gas is extracted from the kiln exhaust gas passage from the bottom of the kiln of the cement kiln to the bottom cyclone of the preheater,
Sprayed with water to the bleed gas, and slaked lime produced in the lime and water the bleed gas is reacted with SO 2 in the bleed gas to remove the SO 2 in the bleed gas,
Collecting dust contained in the extraction gas from which the SO 2 has been removed ;
The slurry containing the collected dust is separated into slaked lime slurry generated from quick lime contained in the dust, gypsum and salt water,
In the spraying step, the processing method of the cement kiln combustion exhaust gas, wherein spray to Rukoto the separated slaked lime slurry into the extracted gas.
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