JP2977759B2 - Exhaust gas dry treatment method and apparatus - Google Patents
Exhaust gas dry treatment method and apparatusInfo
- Publication number
- JP2977759B2 JP2977759B2 JP8071334A JP7133496A JP2977759B2 JP 2977759 B2 JP2977759 B2 JP 2977759B2 JP 8071334 A JP8071334 A JP 8071334A JP 7133496 A JP7133496 A JP 7133496A JP 2977759 B2 JP2977759 B2 JP 2977759B2
- Authority
- JP
- Japan
- Prior art keywords
- activated carbon
- exhaust gas
- powdered activated
- dust collector
- primary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Filtering Of Dispersed Particles In Gases (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、排ガスを、粉状ア
ルカリ剤による脱硫と粉末活性炭による脱硫とを併用し
て２段で効率よく乾式脱硫する方法及び装置、さらに
は、脱硫と同時に脱塵及び脱硝を行うことができる排ガ
スの乾式処理方法及び装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for efficiently performing dry desulfurization of exhaust gas in two stages by using desulfurization with a powdery alkaline agent and desulfurization with powdered activated carbon in combination, and furthermore, dedusting simultaneously with desulfurization. The present invention relates to a method and an apparatus for dry treatment of exhaust gas capable of performing denitration.
【０００２】[0002]
【従来の技術】従来から、石炭焚ボイラ排ガス、油焚ボ
イラ排ガス等の燃焼排ガス中のＳＯｘを除去する技術と
して、生石灰、消石灰又は石灰石等の粉末アルカリ剤を
利用する脱硫方法が知られている。また、特開平７−３
１８４７号公報には、廃棄物焼却炉からの排ガス中に活
性コークス粉末を消石灰粉末とともに吹き込んで、排ガ
ス中のダイオキシン類、塩化水素、重金属、ＳＯｘ等の
有害物質を吸着させるか、又は反応させ、吸着物、反応
物をバグフィルターで捕集・除去し、使用済の活性コー
クスを再生して再使用する排ガス中の有害物質除去方法
が記載されている。2. Description of the Related Art Conventionally, as a technique for removing SOx in combustion exhaust gas such as coal-fired boiler exhaust gas and oil-fired boiler exhaust gas, a desulfurization method using a powdered alkaline agent such as quicklime, slaked lime or limestone has been known. . Also, JP-A-7-3
No. 1847 discloses that activated coke powder is blown together with slaked lime powder into exhaust gas from a waste incinerator to adsorb or react with harmful substances such as dioxins, hydrogen chloride, heavy metals, and SOx in the exhaust gas. A method of collecting and removing adsorbed substances and reactants with a bag filter, regenerating used activated coke, and reusing the same is described.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の脱硫方法で
は、反応率が悪く、Ｃａ／Ｓモル比を３以上にしないと
脱硫率８０％以上を得ることができなかった。このた
め、アルカリ剤の使用量が多くなり、不経済であるばか
りでなく、排ガス中のＳＯｘ濃度を十分に下げることが
できなかった。また、上記の特開平７−３１８４７号公
報記載の方法は、焼却炉排ガス中のダイオキシン類、塩
化水素、水銀等を除去することを主目的としており、脱
硫剤となる消石灰、活性炭は１段（１箇所）で添加され
ているので、これを石炭焚ボイラ排ガスのようなＳＯｘ
を含有する排ガスに適用しても、十分な脱硫率を得るこ
とができないという問題がある。In the above-mentioned conventional desulfurization method, the reaction rate is poor, and unless the Ca / S molar ratio is set to 3 or more, a desulfurization rate of 80% or more cannot be obtained. For this reason, the use amount of the alkali agent is increased, which is not only uneconomical, but also has not been able to sufficiently reduce the concentration of SOx in the exhaust gas. Further, the method described in Japanese Patent Application Laid-Open No. 7-31847 has a main object of removing dioxins, hydrogen chloride, mercury, and the like in exhaust gas from an incinerator, and one step of slaked lime and activated carbon as desulfurizing agents is used. At one location), so this is added to SOx such as coal-fired boiler exhaust gas.
However, there is a problem that a sufficient desulfurization rate cannot be obtained even when applied to an exhaust gas containing.
【０００４】本発明は上記の諸点に鑑みなされたもの
で、本発明の目的は、１次脱硫として粉状のアルカリ剤
を、２次脱硫として粉末活性炭を使用して、排ガス中の
ＳＯｘ濃度を十分低下させると同時に、吸着済の活性炭
を再生炉で再生し、再生炉からの排ガス中の高濃度のＳ
Ｏｘと１次脱硫済のアルカリ剤とを直接接触させて、未
反応物を減少させてアルカリ剤の利用効率を高めること
により、アルカリ剤の使用量を大幅に低減させることが
できる排ガスの乾式処理方法及び装置を提供することに
ある。また、本発明の他の目的は、２次脱硫部の上流側
でアンモニア、尿素等の還元剤を排ガス中に噴霧するこ
とにより活性炭を脱硝触媒として兼用するようにした排
ガスの乾式処理方法及び装置を提供することにある。ま
た、本発明の他の目的は、使用済粉末活性炭の再生炉の
補助燃料として粉末石炭を利用し、かつ、空気及び水蒸
気を再生炉へ同時に供給することにより、再生炉を粉末
活性炭の製造炉としても兼用できるようにした排ガスの
乾式処理方法及び装置を提供することにある。また、本
発明のさらに他の目的は、排ガスの脱硫処理又は／及び
脱硝処理のほかに、脱塵処理をも同時に行うことができ
る排ガスの乾式処理方法及び装置を提供することにあ
る。The present invention has been made in view of the above-mentioned points, and an object of the present invention is to reduce the SOx concentration in exhaust gas by using a powdered alkaline agent as primary desulfurization and a powdered activated carbon as secondary desulfurization. At the same time, the activated carbon that has been adsorbed is regenerated in the regeneration furnace, and the high concentration of sulfur in the exhaust gas from the regeneration furnace is reduced.
Dry treatment of exhaust gas that can greatly reduce the amount of alkali agent used by directly contacting Ox with the primary desulfurized alkali agent to reduce unreacted substances and increase the use efficiency of the alkali agent It is to provide a method and an apparatus. Another object of the present invention is to provide a method and an apparatus for dry-treating exhaust gas, in which activated carbon is also used as a denitration catalyst by spraying a reducing agent such as ammonia or urea into the exhaust gas upstream of the secondary desulfurization unit. Is to provide. Another object of the present invention is to use a powdered coal as an auxiliary fuel for a regeneration furnace for spent powdered activated carbon, and to supply air and steam to the regeneration furnace at the same time. It is an object of the present invention to provide a method and an apparatus for dry treatment of exhaust gas, which can be used also as a method. Still another object of the present invention is to provide a method and an apparatus for dry treatment of exhaust gas, which can perform not only desulfurization treatment and / or denitration treatment of exhaust gas but also dust removal treatment at the same time.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明の排ガスの乾式処理方法は、排ガス中に粉
状のアルカリ剤を噴霧し１次乾式集塵機に導入して１次
脱硫・脱塵処理した後、１次処理された排ガスにアンモ
ニア、尿素等の還元剤を添加するとともに粉末活性炭を
噴霧し２次乾式集塵機に導入して２次脱硫・脱硝処理
し、２次処理に使用された使用済粉末活性炭を、補助燃
料用兼粉末活性炭製造用の粉末石炭、空気、水蒸気とと
もに活性炭再生炉と粉末活性炭製造炉を兼ねる旋回式熱
分解・再生炉に導入して再生するとともに石炭を部分燃
焼させて粉末活性炭を製造し、この炉から発生するＳＯ
ｘ含有可燃ガスをボイラに導入して可燃分を燃焼させた
後、ＳＯｘを１次脱硫剤である前記粉状のアルカリ剤と
接触させ、再生された粉末活性炭及び製造された粉末活
性炭を前記２次乾式集塵機上流の排ガス中に噴霧するよ
うに構成されている（図１参照）。アルカリ剤として
は、消石灰（Ｃａ（ＯＨ） 2 ）、生石灰（ＣａＯ）、石
灰石（ＣａＣＯ 3 ）、ドロマイト等が用いられる。 Means for Solving the Problems To achieve the above object,
In the dry treatment method of exhaust gas of the present invention, a powdery alkaline agent is sprayed into the exhaust gas, introduced into a primary dry dust collector, subjected to primary desulfurization and dust removal treatment, and then the primary treated exhaust gas is treated with ammonia. , Urea and other reducing agents are added, and the powdered activated carbon is sprayed and introduced into a secondary dry dust collector for secondary desulfurization and denitrification, and the spent powdered activated carbon used for the secondary treatment is subjected to auxiliary combustion.
The powdered activated carbon is produced by introducing it into a revolving pyrolysis / regeneration furnace that also serves as an activated carbon regeneration furnace and a powdered activated carbon production furnace together with powdered coal, air, and steam for the production of powdered activated carbon. , SO generated from this furnace
After the x-containing combustible gas is introduced into the boiler to burn combustibles, the SOx is brought into contact with the powdery alkaline agent as a primary desulfurizing agent, and the regenerated powdered activated carbon and the produced powdered activated carbon are subjected to the above-mentioned method. It is sprayed into the exhaust gas of the next dry dust collector upstream
It is configured urchin (see FIG. 1). As an alkaline agent
Is slaked lime (Ca (OH) 2 ), quicklime (CaO), stone
Limestone (CaCO 3 ), dolomite and the like are used.
【０００６】また、本発明の方法は、排ガス中に粉状の
アルカリ剤を噴霧し１次乾式集塵機に導入して１次脱硫
・脱塵処理した後、１次処理された排ガスに還元剤を添
加するとともに粉末活性炭を噴霧し２次乾式集塵機に導
入して２次脱硫・脱硝処理し、２次処理に使用された使
用済粉末活性炭を、補助燃料用兼粉末活性炭製造用の粉
末石炭、空気、水蒸気とともに活性炭再生炉と粉末活性
炭製造炉を兼ねる旋回式熱分解・再生炉に導入して再生
するとともに石炭を部分燃焼させて粉末活性炭を製造
し、この炉から発生するＳＯｘ含有可燃ガスを熱交換器
に導入し、空気と水との混合物を加熱して水蒸気を含む
空気として前記旋回式熱分解・再生炉に供給し、熱交換
後のＳＯｘ含有可燃ガスをボイラに導入して可燃分を燃
焼させた後、ＳＯｘを１次脱硫剤である前記粉状のアル
カリ剤と接触させ、再生された粉末活性炭及び製造され
た粉末活性炭を前記２次乾式集塵機上流の排ガス中に噴
霧することを特徴としている（図２参照）。In the method of the present invention, a powdery alkaline agent is sprayed into exhaust gas, introduced into a primary dry dust collector, subjected to primary desulfurization and dust removal treatment, and then a reducing agent is added to the primary treated exhaust gas. In addition, the powdered activated carbon is sprayed, introduced into a secondary dry dust collector, subjected to a secondary desulfurization and denitration treatment, and the spent powdered activated carbon used for the secondary treatment is powdered for the production of auxiliary fuel and powdered activated carbon. > Activated carbon regeneration furnace with powdered coal, air and water vapor and powder activity
It is introduced into a revolving pyrolysis / regeneration furnace that also serves as a coal production furnace to regenerate and partially burn the coal to produce powdered activated carbon.The SOx-containing combustible gas generated from this furnace is introduced into a heat exchanger, The mixture with water is heated and supplied as steam-containing air to the revolving pyrolysis / regeneration furnace, and the SOx-containing combustible gas after heat exchange is introduced into a boiler to burn combustibles. It is characterized in that it is brought into contact with the powdery alkaline agent as a secondary desulfurizing agent, and the regenerated powdered activated carbon and the produced powdered activated carbon are sprayed into exhaust gas upstream of the secondary dry dust collector (see FIG. 2 ).
【０００７】さらに、本発明の方法は、排ガス中に粉状
のアルカリ剤を噴霧し１次乾式集塵機に導入して１次脱
硫・脱塵処理した後、１次処理された排ガスに還元剤を
添加するとともに粉末活性炭を噴霧し２次乾式集塵機に
導入して２次脱硫・脱硝処理し、２次処理に使用された
使用済粉末活性炭を水蒸気とともに活性炭再生炉に導入
して再生し、この炉から発生するＳＯｘ含有可燃ガスを
脱硫反応器に導入し、１次乾式集塵機からの石膏と未反
応アルカリ剤との混合物と接触させて脱硫し、ついでボ
イラに導入して可燃分を燃焼させた後、ＳＯｘを１次脱
硫剤である前記粉状のアルカリ剤と接触させ、再生され
た粉末活性炭を前記２次乾式集塵機上流の排ガス中に噴
霧することを特徴としている（図３参照）。これらの方
法において、１次乾式集塵機及び２次乾式集塵機とし
て、バグフィルター及び乾式電気集塵機のいずれかを用
いることが好ましく、通常は、１次処理された排ガスに
粉末活性炭が連続的に噴霧される。また、２次乾式集塵
機としてバグフィルターを用い、１次処理された排ガス
に、上記の連続噴霧の場合よりも多い量の粉末活炭を噴
霧しろ布表面に粉末活性炭のプレコート層を形成させた
後、１次処理された排ガスをバグフィルターに導入して
処理するようにしてもよい。Further, in the method of the present invention, a powdery alkaline agent is sprayed into exhaust gas, introduced into a primary dry dust collector, subjected to primary desulfurization and dust removal treatment, and then a reducing agent is added to the primary treated exhaust gas. The powdered activated carbon is sprayed and added to the secondary dry dust collector for secondary desulfurization and denitrification. The spent powdered activated carbon used for the secondary treatment is introduced into an activated carbon regeneration furnace together with steam to regenerate the activated carbon. SOx-containing combustible gas generated from the reactor is introduced into a desulfurization reactor, brought into contact with a mixture of gypsum from a primary dry dust collector and an unreacted alkali agent, desulfurized, and then introduced into a boiler to burn combustibles. , SOx is brought into contact with the powdery alkaline agent as a primary desulfurizing agent, and the regenerated powdered activated carbon is sprayed into exhaust gas upstream of the secondary dry dust collector (see FIG. 3 ). In these methods, it is preferable to use either a bag filter or a dry electric precipitator as the primary dry precipitator and the secondary dry precipitator, and usually, the primary-treated exhaust gas is continuously sprayed with powdered activated carbon. . After using a bag filter as a secondary dry dust collector and spraying a larger amount of powdered activated carbon on the exhaust gas subjected to the primary treatment than in the case of the continuous spraying to form a pre-coated layer of the powdered activated carbon on the filter cloth surface Alternatively, the primary-treated exhaust gas may be introduced into a bag filter for processing.
【０００８】本発明の排ガスの乾式処理装置は、粉状の
アルカリ剤が添加されたボイラ排ガスを１次脱硫・脱塵
処理するための１次乾式集塵機と、１次処理された排ガ
スに還元剤及び粉末活性炭が添加された排ガスを２次脱
硫・脱硝するための２次乾式集塵機と、２次処理に使用
された使用済粉末活性炭を再生するとともに、補助燃料
用兼粉末活性炭製造用として供給された粉末石炭を部分
燃焼させて粉末活性炭を製造するための活性炭再生炉と
粉末活性炭製造炉を兼ねる旋回式熱分解・再生炉と、再
生された粉末活性炭及び製造された粉末活性炭を前記２
次乾式集塵機の上流の排ガスダクトに搬送し噴霧するた
めの粉末活性炭搬送手段と、旋回式熱分解・再生炉とボ
イラとを接続するＳＯｘ含有可燃ガス導管と、からなる
ことを特徴としている（図１参照）。The exhaust gas dry treatment apparatus of the present invention comprises a primary dry dust collector for performing primary desulfurization and dust removal treatment on boiler exhaust gas to which a powdered alkaline agent has been added, and a reducing agent for the primary treatment exhaust gas. Secondary dry dust collector for secondary desulfurization and denitrification of exhaust gas to which powdered activated carbon has been added, and regeneration of spent powdered activated carbon used for secondary treatment, and auxiliary fuel
Activated carbon regeneration furnace for producing powdered activated carbon by partially burning powdered coal supplied for the production of powdered activated carbon
A revolving pyrolysis / regeneration furnace also serving as a powdered activated carbon production furnace;
It is characterized by comprising a powdered activated carbon conveying means for conveying and spraying to an exhaust gas duct upstream of a secondary dry dust collector, and a SOx-containing combustible gas conduit for connecting a rotary pyrolysis / regeneration furnace and a boiler (FIG. 1 ).
【０００９】また、本発明の装置は、粉状のアルカリ剤
が添加されたボイラ排ガスを１次脱硫・脱塵処理するた
めの１次乾式集塵機と、１次処理された排ガスに還元剤
及び粉末活性炭が添加された排ガスを２次脱硫・脱硝す
るための２次乾式集塵機と、２次処理に使用された使用
済粉末活性炭を再生するとともに、補助燃料用兼粉末活
性炭製造用として供給された粉末石炭を部分燃焼させて
粉末活性炭を製造するための活性炭再生炉と粉末活性炭
製造炉を兼ねる旋回式熱分解・再生炉と、再生された粉
末活性炭及び製造された粉末活性炭を前記２次乾式集塵
機の上流の排ガスダクトに搬送し噴霧するための粉末活
性炭搬送手段と、旋回式熱分解・再生炉からのＳＯｘ含
有可燃ガスと、空気と水との混合物とを熱交換して水蒸
気を含む空気とするための熱交換器と、この熱交換器と
ボイラとを接続するためのＳＯｘ含有可燃ガス導管と、
この熱交換器と旋回式熱分解・再生炉とを接続する水蒸
気・空気混合気導管と、からなることを特徴としている
（図２参照）。Further, the apparatus of the present invention comprises a primary dry dust collector for performing primary desulfurization and dust removal treatment on boiler exhaust gas to which a powdery alkaline agent has been added, and a reducing agent and a powder for the primary treatment exhaust gas. and secondary dry dust collector for secondary desulfurization and denitration active carbon was added flue gas, reproduces the spent powdered activated carbon used in the secondary processing, and powder active auxiliary fuel
Activated carbon regeneration furnace and powdered activated carbon for producing powdered activated carbon by partially burning powdered coal supplied for the production of activated carbon
A rotary pyrolysis / regeneration furnace also serving as a production furnace ; powder activated carbon transport means for transporting and regenerating the regenerated powdered activated carbon and the produced powdered activated carbon to an exhaust gas duct upstream of the secondary dry dust collector; A heat exchanger for exchanging heat between the SOx-containing combustible gas from the pyrolysis / regeneration furnace and a mixture of air and water into air containing steam, and a heat exchanger for connecting the heat exchanger and the boiler. An SOx-containing combustible gas conduit;
It is characterized by comprising a steam / air mixture pipe connecting this heat exchanger and a revolving pyrolysis / regeneration furnace (see FIG. 2 ).
【００１０】さらに、本発明の装置は、粉状のアルカリ
剤が添加されたボイラ排ガスを１次脱硫・脱塵処理する
ための１次乾式集塵機と、１次処理された排ガスに還元
剤及び粉末活性炭が添加された排ガスを２次脱硫・脱硝
するための２次乾式集塵機と、２次処理に使用された使
用済粉末活性炭を再生するための活性炭再生炉と、再生
された粉末活性炭を前記２次乾式集塵機の上流の排ガス
ダクトに搬送し噴霧するための粉末活性炭搬送手段と、
活性炭再生炉からのＳＯｘ含有可燃ガスと、１次乾式集
塵機からの石膏と未反応アルカリ剤との混合物とを接触
させて脱硫するための脱硫反応器と、この脱硫反応器と
ボイラとを接続する可燃ガス導管と、からなることを特
徴としている（図３参照）。これらの装置において、１
次乾式集塵機及び２次乾式集塵機として、バグフィルタ
ー及び乾式電気集塵機のいずれかを用いることが好まし
い。バグフィルターを用いる場合は、前述のプレコート
方式を採用することもある。The apparatus of the present invention further comprises a primary dry dust collector for performing primary desulfurization and dust removal treatment on boiler exhaust gas to which a powdered alkaline agent has been added, and a reducing agent and a powder for the primary treatment exhaust gas. A secondary dry dust collector for secondary desulfurization and denitration of the exhaust gas to which the activated carbon is added, an activated carbon regeneration furnace for regenerating the used powdered activated carbon used for the secondary treatment, and Powder activated carbon conveying means for conveying and spraying to an exhaust gas duct upstream of the next dry dust collector,
A desulfurization reactor for bringing the SOx-containing combustible gas from the activated carbon regeneration furnace into contact with a mixture of gypsum and an unreacted alkali agent from the primary dry dust collector, and connecting the desulfurization reactor and the boiler And a combustible gas conduit (see FIG. 3 ). In these devices, 1
It is preferable to use either a bag filter or a dry electric dust collector as the secondary dry dust collector and the secondary dry dust collector. When a bag filter is used, the above-described precoat method may be employed.
【００１１】[0011]
【発明の実施の形態】図１は本発明の排ガスの乾式処理
方法を実施する装置の一例で、アルカリ剤による１次脱
硫・脱塵と活性炭による２次脱硫・脱硝とを併用した場
合で、燃焼排ガスの脱硫と脱硝とを同時に行い、かつ、
使用済の粉末活性炭の再生炉の補助燃料として粉末石炭
を使用し水蒸気を再生炉へ同時に供給することにより、
再生炉を粉末活性炭の製造炉として兼用する場合を示し
ている。ボイラ１０から排出されたＳＯｘ（主としてＳ
Ｏ 2 ）を含む燃焼排ガス中に粉状のアルカリ剤（例えば
消石灰）が噴霧され、１次乾式集塵機（例えばバグフィ
ルター）１２に導入されて、煙道内及びバグフィルター
内で化学反応により脱硫される（バグフィルター内のろ
布表面に粉状消石灰層が形成され、主としてこの層で脱
硫される）とともに脱塵された後、１次処理された排ガ
スにアンモニア、尿素等の還元剤が添加されるとともに
粉末活性炭が噴霧され２次乾式集塵機（例えばバグフィ
ルター）１４に導入されて、煙道内及びバグフィルター
内で物理吸着により２次脱硫されるとともに、脱硝処理
される（バグフィルター内のろ布表面に粉末活性炭層が
形成され、主としてこの層で脱硫・脱硝される）。ま
た、１次脱硫・脱塵処理された排ガスに、上記の場合よ
り多い量の粉末活性炭を吹き込 みろ布表面にプレコート
層を形成させた後、１次脱硫・脱塵処理された排ガスを
バグフィルターに導入して、このプレコート層で２次脱
硫・脱硝処理するように構成する場合もある。２次処理
に使用された使用済粉末活性炭（老廃炭）は粉末石炭、
空気、水蒸気とともに旋回式熱分解・再生炉２４に導入
され、燃焼空気比１以下、望ましくは０．４〜０．８の
部分燃焼制御を行って、粉末活性炭を製造すると同時に
使用済粉末活性炭を再生する。旋回式熱分解・再生炉２
４から発生するＳＯｘ含有可燃ガスは、ＳＯｘ含有可燃
ガス導管１８を介してボイラ１０に導入されて可燃物が
燃焼し後、１次脱硫剤である前記粉状のアルカリ剤と接
触して脱硫処理され、燃焼排ガスとともに前記と同様の
処理がなされる。旋回式熱分解・再生炉２４で製造され
た粉末活性炭及び再生された再生粉末活性炭は、粉末活
性炭搬送手段（例えば気流搬送手段）２０により搬送さ
れ、前記２次乾式集塵機１４上流の排ガス中に噴霧され
て再利用される。２２は排ガス誘引ファンである。図１
に示す装置においては、２段で脱硫するので脱硫率が向
上する。また、アルカリ剤の利用効率が高められ、未反
応アルカリ剤の減少及びアルカリ剤添加率の低減を図る
ことができる。図１に示す装置では、排ガスの脱硫以外
に、脱ダイオキシン類、脱塩化水素、脱重金属等に適用
することができる。 DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows a dry treatment of exhaust gas according to the present invention.
An example of an apparatus for performing the method, in which the primary
When sulfuric acid / dust removal and secondary desulfurization / denitration with activated carbon are used together
In case performs the desulfurization and denitration of combustion exhaust gas at the same time, and,
By using powdered coal as an auxiliary fuel for the spent powdered activated carbon regeneration furnace and simultaneously supplying steam to the regeneration furnace,
The case where the regeneration furnace is also used as a production furnace for powdered activated carbon is shown. SOx discharged from boiler 10 (mainly S
A powdery alkaline agent (eg, slaked lime) is sprayed into the combustion exhaust gas containing O 2 ) , introduced into a primary dry dust collector (eg, a bag filter) 12, and desulfurized by a chemical reaction in the flue and the bag filter. (Filter in the bag filter
A powdered slaked lime layer is formed on the fabric surface,
After being dedusting while being vulcanized), is introduced ammonia, a secondary powdered activated carbon is sprayed dry dust collector (e.g., bag filter) 14 with a reducing agent such as urea is added to the primary treated exhaust gas, Secondary desulfurization by physical adsorption in flue and bag filter and denitration treatment (powder activated carbon layer on filter cloth surface in bag filter)
Formed and desulfurized and denitrated mainly in this layer) . Ma
In addition, the primary desulfurization and dust removal
Pre-coat to the large amount of powdered activated carbon to blow write Miro cloth surface Ri
After forming a layer, the exhaust gas that has been subjected to primary desulfurization and dust removal
Introduce it to the bag filter and remove the secondary
In some cases, it is configured to perform sulfuric acid / denitrification treatment. The used powdered activated carbon (old waste coal) used for the secondary treatment is powdered coal,
Air and water vapor are introduced into the revolving pyrolysis / regeneration furnace 24, and a partial combustion control of a combustion air ratio of 1 or less, preferably 0.4 to 0.8 is performed to produce powdered activated carbon and to simultaneously use spent powdered activated carbon. Reproduce. Rotary pyrolysis / regeneration furnace 2
The SOx-containing combustible gas generated from 4 is introduced into the boiler 10 through the SOx-containing combustible gas conduit 18 to burn combustibles, and then comes into contact with the powdery alkaline agent as a primary desulfurizing agent to perform desulfurization treatment. Then, the same processing as described above is performed together with the combustion exhaust gas. The powdered activated carbon produced in the revolving pyrolysis / regeneration furnace 24 and the regenerated regenerated powdered activated carbon are transported by powdered activated carbon transporting means (for example, airflow transporting means) 20 and sprayed into exhaust gas upstream of the secondary dry dust collector 14. Being reused. Reference numeral 22 denotes an exhaust gas induction fan. FIG.
In the equipment shown in (1), desulfurization is performed in two stages, so
Up. In addition, the use efficiency of alkaline
Reduction of alkali-treating agent and reduction of alkali-adding rate
be able to. In the apparatus shown in FIG. 1, other than desulfurization of exhaust gas
And for dioxins, hydrogen chloride, heavy metals, etc.
can do.
【００１２】図２は本発明の排ガスの乾式処理装置の他
の例で、燃焼排ガスの脱硫と脱硝とを同時に行い、水蒸
気発生をボイラを使用しないでガス・ガス熱交換器（空
気加熱器）で行い、さらに、粉末活性炭を製造すること
ができるようにしたものである。ボイラ１０から排出さ
れたＳＯｘを含む燃焼排ガス中に粉状のアルカリ剤（例
えば消石灰）が噴霧され、１次乾式集塵機（例えばバグ
フィルター）１２に導入されて、煙道内及びバグフィル
ター内で化学反応により脱硫されるとともに脱塵された
後、１次処理された排ガスにアンモニア、尿素等の還元
剤が添加されるとともに粉末活性炭が噴霧され２次乾式
集塵機（例えばバグフィルター）１４に導入されて、煙
道内及びバグフィルター内で物理吸着により２次脱硫さ
れるとともに、脱硝処理される。２次処理に使用された
使用済粉末活性炭（老廃炭）は粉末石炭、空気、水蒸気
とともに旋回式熱分解・再生炉２４に導入され、燃焼空
気比１以下、望ましくは０．４〜０．８の部分燃焼制御
を行って、粉末活性炭を製造すると同時に使用済粉末活
性炭を再生する。旋回式熱分解・再生炉２４から発生す
るＳＯｘ含有可燃ガスは、ＳＯｘ含有可燃ガス導管１８
を介してガス・ガス熱交換器（空気加熱器）２６に導入
されて空気を加熱する。この加熱空気の一部は循環導管
２８を介して熱交換器２６の上流側に戻されるととも
に、この循環導管２８又は熱交換器の上流側の空気供給
管３０に水を注入する。空気と水との混合物は熱交換器
２６に導入され加熱されて、水蒸気と加熱空気との混合
気となって水蒸気・空気混合気導管３２を介して旋回式
熱分解・再生炉２４に導入される。熱交換器２６を出た
ＳＯｘ含有可燃ガスはボイラ１０に導入されて可燃物が
燃焼した後、１次脱硫剤である前記粉状のアルカリ剤と
接触して脱硫処理され、燃焼排ガスとともに前記と同様
の処理がなされる。旋回式熱分解・再生炉２４で製造さ
れた粉末活性炭及び再生された再生粉末活性炭は、粉末
活性炭搬送手段（例えば気流搬送手段）２０により搬送
され、前記２次乾式集塵機１４上流の排ガス中に噴霧さ
れて再利用される。FIG. 2 shows another embodiment of the exhaust gas dry treatment apparatus of the present invention, in which the desulfurization and the denitration of the combustion exhaust gas are simultaneously performed, and the steam is generated without using a boiler in a gas-gas heat exchanger (air heater). And activated carbon powder can be produced. A powdery alkaline agent (eg, slaked lime) is sprayed into the combustion exhaust gas containing SOx discharged from the boiler 10 and introduced into a primary dry dust collector (eg, a bag filter) 12 to perform a chemical reaction in the flue and the bag filter. After being subjected to desulfurization and dust removal, the primary-treated exhaust gas is added with a reducing agent such as ammonia and urea, is sprayed with powdered activated carbon, and is introduced into a secondary dry dust collector (eg, a bag filter) 14, Secondary desulfurization is performed by physical adsorption in the flue and in the bag filter, and denitration is performed. The spent powdered activated carbon (waste coal) used in the secondary treatment is introduced into the rotary pyrolysis / regeneration furnace 24 together with the powdered coal, air and steam, and the combustion air ratio is 1 or less, preferably 0.4 to 0.8. Is performed to produce powdered activated carbon and simultaneously regenerate used powdered activated carbon. The SOx-containing combustible gas generated from the revolving pyrolysis / regeneration furnace 24 is supplied to the SOx-containing combustible gas conduit 18.
And is introduced into a gas-gas heat exchanger (air heater) 26 to heat the air. A part of the heated air is returned to the upstream side of the heat exchanger 26 through the circulation conduit 28, and water is injected into the circulation conduit 28 or the air supply pipe 30 upstream of the heat exchanger. The mixture of air and water is introduced into the heat exchanger 26 where it is heated, becomes a mixture of steam and heated air, and is introduced into the rotary pyrolysis / regeneration furnace 24 through the steam / air mixture conduit 32. You. After the SOx-containing combustible gas exiting the heat exchanger 26 is introduced into the boiler 10 and combustibles are burned, the combustible gas comes into contact with the powdery alkaline agent as a primary desulfurizing agent and is subjected to desulfurization treatment. Similar processing is performed. The powdered activated carbon produced in the revolving pyrolysis / regeneration furnace 24 and the regenerated regenerated powdered activated carbon are transported by powdered activated carbon transporting means (for example, airflow transporting means) 20 and sprayed into exhaust gas upstream of the secondary dry dust collector 14. Being reused.
【００１３】図２に示す方法及び装置は、粉末活性炭の
製造に特徴を有している。すなわち、粉末活性炭及び、
水蒸気と加熱空気との混合気を旋回式熱分解炉（この場
合は、旋回式熱分解・再生炉の代わりに旋回式熱分解炉
を用いる）に導入し粉末石炭を部分燃焼させて粉末活性
炭を製造し、この炉から発生するＳＯｘ含有可燃ガスを
熱交換器２６に導入し、空気と水との混合物を加熱して
水蒸気を含む空気として、前記旋回式熱分解炉に供給す
るものである。なお、旋回式熱分解炉の代わりに旋回式
熱分解・再生炉を用い、使用済粉末活性炭を供給して、
粉末活性炭の製造と使用済粉末活性炭の再生とを同時に
行うように構成してもよい。これらの場合は、高濃度水
蒸気を含む高温空気により、低空気比で活性炭賦活温度
を維持することができる。このため、高圧水蒸気を必要
とせず、ボイラを必要としない。また、活性炭の固定炭
素を多く残留させることができ、歩留りが高くなる。The method and apparatus shown in FIG. 2 are characterized by the production of powdered activated carbon. That is, powdered activated carbon and
A mixture of steam and heated air is introduced into a swirling pyrolysis furnace (in this case, a swirling pyrolysis furnace is used instead of the swirling pyrolysis / regeneration furnace) to partially burn the powdered coal to produce powdered activated carbon. The SOx-containing combustible gas produced from the furnace is introduced into the heat exchanger 26, and a mixture of air and water is heated to supply the mixture as steam-containing air to the rotary pyrolysis furnace. In addition, instead of the rotary pyrolysis furnace, a rotary pyrolysis / regeneration furnace was used to supply used powdered activated carbon,
The production of powdered activated carbon and the regeneration of used powdered activated carbon may be performed simultaneously. In these cases, the activated carbon activation temperature can be maintained at a low air ratio by high-temperature air containing high-concentration steam. Therefore, no high-pressure steam is required, and no boiler is required. Further, a large amount of fixed carbon of the activated carbon can be left, and the yield increases.
【００１４】図３は本発明の排ガスの乾式処理装置の他
の例で、燃焼排ガスの脱硫と脱硝とを同時に行い、粉末
活性炭の製造炉とは兼用しない再生炉専用のフローで、
再生炉排ガス量が少なく再生炉もコンパクトになるよう
にしたものを示している。ボイラ１０から排出されたＳ
Ｏｘを含む燃焼排ガス中に粉状のアルカリ剤（例えば消
石灰）が噴霧され、１次乾式集塵機（例えばバグフィル
ター）１２に導入されて、煙道内及びバグフィルター内
で化学反応により脱硫されるとともに脱塵された後、１
次処理された排ガスにアンモニア、尿素等の還元剤が添
加されるとともに粉末活性炭が噴霧され２次乾式集塵機
（例えばバグフィルター）１４に導入されて、煙道内及
びバグフィルター内で物理吸着により２次脱硫されると
ともに、脱硝処理される。２次処理に使用された使用済
粉末活性炭（老廃炭）は、水蒸気とともに活性炭再生炉
１６に導入されて再生される。活性炭再生炉１６から発
生する例えば、２００〜５００℃のＳＯｘ含有可燃ガス
は、ＳＯｘ含有可燃ガス導管１８を介して脱硫反応器３
４に導入され、１次乾式集塵機１２からの未反応アルカ
リ剤を含む石膏と接触させて、未反応アルカリ剤により
脱硫される。脱硫反応器３４からの例えば、１５０〜３
００℃の可燃ガスは、可燃ガス導管３６を介してボイラ
１０に導入されて可燃物が燃焼した後、１次脱硫剤であ
る前記粉状のアルカリ剤と接触して残存するＳＯｘが脱
硫処理され、燃焼排ガスとともに前記と同様の処理がな
される。また、ボイラ１０で発生した水蒸気の一部は、
ヒーター３８により、例えば、３００〜６００℃に加熱
されて活性炭再生炉に供給される。活性炭再生炉１６で
賦活・再生された粉末活性炭は、粉末活性炭搬送手段
（例えば気流搬送手段）２０により搬送され、前記２次
乾式集塵機１４上流の排ガス中に噴霧されて再利用され
る。FIG. 3 shows another example of the exhaust gas dry treatment apparatus according to the present invention, which is a flow dedicated to a regeneration furnace which simultaneously performs desulfurization and denitration of combustion exhaust gas and does not double as a powdered activated carbon production furnace.
The figure shows that the amount of exhaust gas from the regeneration furnace is small and the regeneration furnace is compact. S discharged from boiler 10
A powdery alkaline agent (for example, slaked lime) is sprayed into the combustion exhaust gas containing Ox, introduced into a primary dry dust collector (for example, a bag filter) 12, and subjected to a chemical reaction in a flue and a bag filter by a chemical reaction, and also to be desulfurized. After being dusted, 1
A reducing agent such as ammonia and urea is added to the exhaust gas that has been subjected to the next treatment, and powdered activated carbon is sprayed and introduced into a secondary dry dust collector (eg, a bag filter) 14, where it is physically adsorbed in the flue and the bag filter. It is desulfurized and denitrated. The used powdered activated carbon (old carbon) used in the secondary treatment is introduced into an activated carbon regeneration furnace 16 together with steam to be regenerated. The SOx-containing combustible gas of, for example, 200 to 500 ° C. generated from the activated carbon regeneration furnace 16 is supplied to the desulfurization reactor 3 via the SOx-containing combustible gas conduit 18.
4 and is brought into contact with gypsum containing an unreacted alkaline agent from the primary dry dust collector 12 and desulfurized by the unreacted alkaline agent. For example, from 150 to 3 from the desulfurization reactor 34
The flammable gas of 00 ° C. is introduced into the boiler 10 through the flammable gas conduit 36 and combustibles are burned. Then, the remaining SOx is desulfurized by contacting the powdery alkaline agent as a primary desulfurizing agent. The same processing as described above is performed together with the combustion exhaust gas. Some of the steam generated by the boiler 10 is
The heater 38 is heated to, for example, 300 to 600 ° C. and supplied to the activated carbon regeneration furnace. The powdered activated carbon activated and regenerated in the activated carbon regeneration furnace 16 is transported by a powdered activated carbon transporting means (for example, an air current transporting means) 20, is sprayed into exhaust gas upstream of the secondary dry dust collector 14, and is reused.
【００１５】[0015]
【発明の効果】本発明は上記のように構成されているの
で、つぎのような効果を奏する。 （１） 請求項１、６の場合（図１）は、粉状アルカリ
剤による脱硫と粉末活性炭による脱硫とを併用して２段
で脱硫するので、脱硫率が向上する。また、活性炭再生
炉からのＳＯｘ含有可燃ガスをボイラへ導入して可燃物
を燃焼させた後、粉状アルカリ剤と接触させるので、ア
ルカリ剤利用効率が高められ、未反応アルカリ剤の減少
及びアルカリ剤添加率の低減を図ることができる。ま
た、脱硫と同時に脱塵を行うことができる。 （２） 請求項１、６の場合（図１）は、上記（１）の
効果に加えて、つぎの効果がある。すなわち、活性炭の
再生炉と製造炉とを兼用するので、粉末石炭から粉末活
性炭を製造すると同時に老廃炭を再生することができ
る。また、旋回式熱分解・再生炉を用いる場合は、炭化
炉と賦活炉（再生炉）を兼用することができ、炉及びフ
ローがシンプルでコンパクトになる。さらに、アンモニ
ア、尿素等の還元剤の添加により脱硫と脱硝とを同時に
行うことができる。 （３） 請求項２、７の場合（図２）は、上記（２）の
効果に加えて、つぎの効果がある。すなわち、ガス・ガ
ス熱交換器（空気加熱器）出口に空気の循環導管を設
け、この循環導管に水を注入して旋回式熱分解・再生炉
からのＳＯｘ含有可燃ガスで加熱して水蒸気を含む加熱
空気を発生させるので、ボイラから水蒸気を旋回式熱分
解・再生炉に供給する必要がなく、ボイラ不要で水蒸気
を発生させることができ、ボイラの運転資格が不要とな
る。また、高濃度水蒸気を含む高温空気により、低空気
比で活性炭賦活（再生）温度を維持することができる。
このため、高圧水蒸気を必要とせず、ボイラを必要とし
ない。また活性炭の固定炭素を多く残留させることがで
き、歩留りが高くなる。 （４） 請求項３、８の場合（図３）は、上記（１）の
効果に加えて、高温の水蒸気のみ（水蒸気１００％）に
より老廃炭を再生するので、活性炭再生炉からのＳＯｘ
含有可燃ガス量が少なくなり、かつ、再生反応速度が速
くなり、活性炭反応器容量を小さくすることができる。As described above, the present invention has the following effects. (1) In the case of claims 1 and 6 (FIG. 1), desulfurization is improved in two stages by using desulfurization using a powdered alkaline agent and desulfurization using powdered activated carbon in combination. Further, since the combustible gas containing SOx from the activated carbon regeneration furnace is introduced into the boiler to burn the combustible material, the combustible gas is brought into contact with the powdered alkaline agent, so that the use efficiency of the alkaline agent is increased, the reduction of the unreacted alkaline agent and the reduction of the alkali. The agent addition rate can be reduced. In addition, dedusting can be performed simultaneously with desulfurization. (2) In the case of claims 1 and 6 (FIG. 1 ), the following effect is obtained in addition to the effect of (1). That is, since the regeneration furnace and the production furnace of the activated carbon are also used, it is possible to produce the powdered activated carbon from the powdered coal and at the same time to regenerate the waste carbon. In the case of using a revolving pyrolysis / regeneration furnace, the carbonization furnace and the activation furnace (regeneration furnace) can be used together, and the furnace and the flow are simple and compact. Furthermore, desulfurization and denitration can be performed simultaneously by adding a reducing agent such as ammonia or urea. (3) In the case of claims 2 and 7 (FIG. 2 ), the following effect is obtained in addition to the effect of (2). That is, an air circulation conduit is provided at the outlet of the gas-gas heat exchanger (air heater), water is injected into the circulation conduit, and the vapor is heated by the SOx-containing combustible gas from the revolving pyrolysis / regeneration furnace. Since the generated heated air is generated, there is no need to supply steam from the boiler to the revolving pyrolysis / regeneration furnace, the steam can be generated without the need for the boiler, and the operating qualification of the boiler becomes unnecessary. In addition, the activated carbon activation (regeneration) temperature can be maintained at a low air ratio by high-temperature air containing high-concentration steam.
Therefore, no high-pressure steam is required, and no boiler is required. Further, a large amount of fixed carbon of the activated carbon can be left, and the yield is increased. (4) In the case of Claims 3 and 8 (FIG. 3 ), in addition to the effect of the above (1), since the waste coal is regenerated only with high-temperature steam (steam 100%), SOx from the activated carbon regeneration furnace is used.
The amount of combustible gas contained decreases, the regeneration reaction speed increases, and the capacity of the activated carbon reactor can be reduced.
【図１】本発明の排ガスの乾式処理方法を実施する装置
の一例を示すフローシートである。FIG. 1 is a flow sheet showing an example of an apparatus for performing a dry treatment method for exhaust gas of the present invention.
【図２】本発明の装置の他の例を示すフローシートであ
る。FIG. 2 is a flow sheet showing another example of the apparatus of the present invention.
【図３】本発明の装置のさらに他の例を示すフローシー
トである。FIG. 3 is a flow sheet showing still another example of the apparatus of the present invention.
１０ ボイラ １２ １次乾式集塵機 １４ ２次乾式集塵機 １６ 活性炭再生炉 １８ ＳＯｘ含有可燃ガス導管 ２０ 粉末活性炭搬送手段 ２２ 排ガス誘引ファン ２４ 旋回式熱分解・再生炉 ２６ ガス・ガス熱交換器 ２８ 循環導管 ３０ 空気供給管 ３２ 水蒸気・空気混合気導管 ３４ 脱硫反応器 ３６ 可燃ガス導管 ３８ ヒーター DESCRIPTION OF SYMBOLS 10 Boiler 12 Primary dry dust collector 14 Secondary dry dust collector 16 Activated carbon regeneration furnace 18 SOx-containing combustible gas conduit 20 Powder activated carbon conveying means 22 Exhaust gas induction fan 24 Rotary pyrolysis / regeneration furnace 26 Gas / gas heat exchanger 28 Circulation conduit 30 Air supply pipe 32 Steam / air mixture pipe 34 Desulfurization reactor 36 Combustible gas pipe 38 Heater
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｆ２３Ｊ 15/00 ＺＡＢ (58)調査した分野(Int.Cl.6，ＤＢ名) B01D 53/60 B01D 53/34 B01D 53/74 F23J 15/00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 identification code FIF23J 15/00 ZAB (58) Investigated field (Int.Cl. 6 , DB name) B01D 53/60 B01D 53/34 B01D 53 / 74 F23J 15/00
Claims (9)
次乾式集塵機に導入して１次脱硫・脱塵処理した後、１
次処理された排ガスに還元剤を添加するとともに粉末活
性炭を噴霧し２次乾式集塵機に導入して２次脱硫・脱硝
処理し、２次処理に使用された使用済粉末活性炭を、補
助燃料用兼粉末活性炭製造用の粉末石炭、空気、水蒸気
とともに活性炭再生炉と粉末活性炭製造炉を兼ねる旋回
式熱分解・再生炉に導入して再生するとともに石炭を部
分燃焼させて粉末活性炭を製造し、この炉から発生する
ＳＯｘ含有可燃ガスをボイラに導入して可燃分を燃焼さ
せた後、ＳＯｘを１次脱硫剤である前記粉状のアルカリ
剤と接触させ、再生された粉末活性炭及び製造された粉
末活性炭を前記２次乾式集塵機上流の排ガス中に噴霧す
ることを特徴とする排ガスの乾式処理方法。1. A powdery alkaline agent is sprayed into exhaust gas to
After the primary desulfurization and dedusting treatment after being introduced into the secondary dry dust collector,
A reducing agent is added to the exhaust gas that has been subjected to the next treatment, and the powdered activated carbon is sprayed and introduced into a secondary dry dust collector to carry out a secondary desulfurization and denitration treatment to supplement the used powdered activated carbon used in the secondary treatment.
Revolving furnace that also serves as activated carbon regeneration furnace and powdered activated carbon production furnace together with powdered coal, air and steam for auxiliary fuel and powdered activated carbon production
After being introduced into a thermal cracking / regeneration furnace for regeneration, coal is partially burned to produce powdered activated carbon, and SOx-containing combustible gas generated from this furnace is introduced into a boiler to burn combustibles. A dry treatment method for exhaust gas, comprising contacting the powdered alkaline agent as a primary desulfurizing agent with the powdered activated carbon, and spraying the regenerated powdered activated carbon and the produced powdered activated carbon into exhaust gas upstream of the secondary dry dust collector. .
次乾式集塵機に導入して１次脱硫・脱塵処理した後、１
次処理された排ガスに還元剤を添加するとともに粉末活
性炭を噴霧し２次乾式集塵機に導入して２次脱硫・脱硝
処理し、２次処理に使用された使用済粉末活性炭を、補
助燃料用兼粉末活性炭製造用の粉末石炭、空気、水蒸気
とともに活性炭再生炉と粉末活性炭製造炉を兼ねる旋回
式熱分解・再生炉に導入して再生するとともに石炭を部
分燃焼させて粉末活性炭を製造し、この炉から発生する
ＳＯｘ含有可燃ガスを熱交換器に導入し、空気と水との
混合物を加熱して水蒸気を含む空気として前記旋回式熱
分解・再生炉に供給し、熱交換後のＳＯｘ含有可燃ガス
をボイラに導入して可燃分を燃焼させた後、ＳＯｘを１
次脱硫剤である前記粉状のアルカリ剤と接触させ、再生
された粉末活性炭及び製造された粉末活性炭を前記２次
乾式集塵機上流の排ガス中に噴霧することを特徴とする
排ガスの乾式処理方法。2. A method in which a powdery alkaline agent is sprayed into exhaust gas.
After the primary desulfurization and dedusting treatment after being introduced into the secondary dry dust collector,
A reducing agent is added to the exhaust gas that has been subjected to the next treatment, and the powdered activated carbon is sprayed and introduced into a secondary dry dust collector to carry out a secondary desulfurization and denitration treatment to supplement the used powdered activated carbon used in the secondary treatment.
Revolving furnace that also serves as activated carbon regeneration furnace and powdered activated carbon production furnace together with powdered coal, air and steam for auxiliary fuel and powdered activated carbon production
It is introduced into a thermal cracking / regeneration furnace to regenerate and partially burn coal to produce powdered activated carbon. SOx-containing combustible gas generated from this furnace is introduced into a heat exchanger to heat a mixture of air and water. Is supplied to the revolving pyrolysis / regeneration furnace as air containing steam, and the SOx-containing combustible gas after heat exchange is introduced into a boiler to burn combustibles, and then SOx is reduced to 1%.
A dry treatment method for exhaust gas, comprising contacting the powdered alkaline agent as a secondary desulfurizing agent with the powdered activated carbon, and spraying the regenerated powdered activated carbon and the produced powdered activated carbon into exhaust gas upstream of the secondary dry dust collector.
次乾式集塵機に導入して１次脱硫・脱塵処理した後、１
次処理された排ガスに還元剤を添加するとともに粉末活
性炭を噴霧し２次乾式集塵機に導入して２次脱硫・脱硝
処理し、２次処理に使用された使用済粉末活性炭を水蒸
気とともに活性炭再生炉に導入して再生し、この炉から
発生するＳＯｘ含有可燃ガスを脱硫反応器に導入し、１
次乾式集塵機からの石膏と未反応アルカリ剤との混合物
と接触させて脱硫し、ついでボイラに導入して可燃分を
燃焼させた後、ＳＯｘを１次脱硫剤である前記粉状のア
ルカリ剤と接触させ、再生された粉末活性炭を前記２次
乾式集塵機上流の排ガス中に噴霧することを特徴とする
排ガスの乾式処理方法。3. A method in which a powdery alkaline agent is sprayed into exhaust gas.
After the primary desulfurization and dedusting treatment after being introduced into the secondary dry dust collector,
A reducing agent is added to the exhaust gas that has been subjected to the next treatment, and the activated carbon powder is sprayed and introduced into a secondary dry dust collector to perform a secondary desulfurization and denitration treatment. And the SOx-containing combustible gas generated from this furnace is introduced into a desulfurization reactor,
Next, after contacting with a mixture of gypsum and an unreacted alkali agent from a dry dust collector and desulfurizing it, and then introducing it into a boiler to burn combustibles, SOx is removed with the powdered alkaline agent as a primary desulfurizing agent. A dry treatment method for exhaust gas, comprising contacting and regenerating powdered activated carbon into exhaust gas upstream of the secondary dry dust collector.
バグフィルター及び乾式電気集塵機のいずれかであり、
１次処理された排ガスに粉末活性炭を連続的に噴霧する
請求項１、２又は３記載の排ガスの乾式処理方法。4. The primary dry dust collector and the secondary dry dust collector,
Either a bag filter or a dry electric dust collector,
The dry treatment method for exhaust gas according to claim 1, 2 or 3 , wherein powdered activated carbon is continuously sprayed on the exhaust gas after the primary treatment.
り、１次処理された排ガスに粉末活性炭を噴霧しろ布表
面に粉末活性炭のプレコート層を形成させた後１次処理
された排ガスをバグフィルターに導入する請求項１、２
又は３記載の排ガスの乾式処理方法。 5. A secondary dry dust collector is a bag filter, wherein the primary-treated exhaust gas is sprayed with powdered activated carbon to form a pre-coated layer of the powdered activated carbon on the surface of the filter cloth, and then the primary-treated exhaust gas is used as a bag filter. Claims 1 and 2 to be introduced
Or the dry treatment method of exhaust gas according to 3 .
ガスを１次脱硫・脱塵処理するための１次乾式集塵機
と、 １次処理された排ガスに還元剤及び粉末活性炭が添加さ
れた排ガスを２次脱硫・脱硝するための２次乾式集塵機
と、 ２次処理に使用された使用済粉末活性炭を再生するとと
もに、補助燃料用兼粉末活性炭製造用として供給された
粉末石炭を部分燃焼させて粉末活性炭を製造するための
活性炭再生炉と粉末活性炭製造炉を兼ねる旋回式熱分解
・再生炉と、 再生された粉末活性炭及び製造された粉末活性炭を前記
２次乾式集塵機の上流の排ガスダクトに搬送し噴霧する
ための粉末活性炭搬送手段と、 旋回式熱分解・再生炉とボイラとを接続するＳＯｘ含有
可燃ガス導管と、 からなることを特徴とする排ガスの乾式処理装置。6. A primary dry dust collector for subjecting a boiler exhaust gas to which a powdery alkaline agent has been added to primary desulfurization and dust removal processing, and an exhaust gas obtained by adding a reducing agent and powdered activated carbon to the primary treated exhaust gas. And a secondary dry dust collector for secondary desulfurization and denitrification of the wastewater, and recycle the used powdered activated carbon used for the secondary treatment, and the powdered coal supplied for the auxiliary fuel and powdered activated carbon production. To produce powdered activated carbon by partially burning
A rotary pyrolysis / regeneration furnace that also serves as an activated carbon regeneration furnace and a powdered activated carbon production furnace; and powdered activated carbon for conveying and spraying the regenerated powdered activated carbon and the produced powdered activated carbon to an exhaust gas duct upstream of the secondary dry dust collector. An exhaust gas dry treatment apparatus comprising: a conveying means; and a SOx-containing flammable gas conduit for connecting a rotary pyrolysis / regeneration furnace and a boiler.
ガスを１次脱硫・脱塵処理するための１次乾式集塵機
と、 １次処理された排ガスに還元剤及び粉末活性炭が添加さ
れた排ガスを２次脱硫・脱硝するための２次乾式集塵機
と、 ２次処理に使用された使用済粉末活性炭を再生するとと
もに、補助燃料用兼粉末活性炭製造用として供給された
粉末石炭を部分燃焼させて粉末活性炭を製造するための
活性炭再生炉と粉末活性炭製造炉を兼ねる旋回式熱分解
・再生炉と、 再生された粉末活性炭及び製造された粉末活性炭を前記
２次乾式集塵機の上流の排ガスダクトに搬送し噴霧する
ための粉末活性炭搬送手段と、 旋回式熱分解・再生炉からのＳＯｘ含有可燃ガスと、空
気と水との混合物とを熱交換して水蒸気を含む空気とす
るための熱交換器と、 この熱交換器とボイラとを接続するためのＳＯｘ含有可
燃ガス導管と、 この熱交換器と旋回式熱分解・再生炉とを接続する水蒸
気・空気混合気導管と、 からなることを特徴とする排ガスの乾式処理装置。7. A primary dry dust collector for subjecting a boiler exhaust gas to which a powdery alkaline agent has been added to primary desulfurization and dust removal processing, and an exhaust gas obtained by adding a reducing agent and powdered activated carbon to the primary treated exhaust gas. And a secondary dry dust collector for secondary desulfurization and denitrification of the wastewater, and recycle the used powdered activated carbon used for the secondary treatment, and the powdered coal supplied for the auxiliary fuel and powdered activated carbon production. To produce powdered activated carbon by partially burning
A rotary pyrolysis / regeneration furnace that also serves as an activated carbon regeneration furnace and a powdered activated carbon production furnace; and powdered activated carbon for conveying and spraying the regenerated powdered activated carbon and the produced powdered activated carbon to an exhaust gas duct upstream of the secondary dry dust collector. Conveying means; a heat exchanger for exchanging heat between the SOx-containing combustible gas from the rotary pyrolysis / regeneration furnace and a mixture of air and water into air containing steam; and a heat exchanger and a boiler. And a steam / air mixture conduit connecting the heat exchanger and the revolving pyrolysis / regeneration furnace.
ガスを１次脱硫・脱塵処理するための１次乾式集塵機
と、 １次処理された排ガスに還元剤及び粉末活性炭が添加さ
れた排ガスを２次脱硫・脱硝するための２次乾式集塵機
と、 ２次処理に使用された使用済粉末活性炭を再生するため
の活性炭再生炉と、 再生された粉末活性炭を前記２次乾式集塵機の上流の排
ガスダクトに搬送し噴霧するための粉末活性炭搬送手段
と、 活性炭再生炉からのＳＯｘ含有可燃ガスと、１次乾式集
塵機からの石膏と未反応アルカリ剤との混合物とを接触
させて脱硫するための脱硫反応器と、 この脱硫反応器とボイラとを接続する可燃ガス導管と、 からなることを特徴とする排ガスの乾式処理装置。8. A primary dry dust collector for subjecting a boiler exhaust gas to which a powdered alkaline agent has been added to primary desulfurization and dust removal processing, and an exhaust gas obtained by adding a reducing agent and powdered activated carbon to the primary treated exhaust gas. Secondary dry dust collector for secondary desulfurization and denitrification, activated carbon regeneration furnace for regenerating used powdered activated carbon used for secondary treatment, and regenerated powdered activated carbon upstream of the secondary dry dust collector A powdered activated carbon transport means for transporting and spraying to an exhaust gas duct; and an SOx-containing combustible gas from an activated carbon regeneration furnace, and a mixture of gypsum and an unreacted alkali agent from a primary dry dust collector for desulfurization. An exhaust gas dry treatment apparatus, comprising: a desulfurization reactor; and a combustible gas pipe connecting the desulfurization reactor and the boiler.
バグフィルター及び乾式電気集塵機のいずれかである請
求項６、７又は８記載の排ガスの乾式処理装置。9. The primary dry dust collector and the secondary dry dust collector,
The exhaust gas dry treatment apparatus according to claim 6, 7 or 8, which is one of a bag filter and a dry electric dust collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8071334A JP2977759B2 (en) | 1996-03-01 | 1996-03-01 | Exhaust gas dry treatment method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8071334A JP2977759B2 (en) | 1996-03-01 | 1996-03-01 | Exhaust gas dry treatment method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09234333A JPH09234333A (en) | 1997-09-09 |
| JP2977759B2 true JP2977759B2 (en) | 1999-11-15 |
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ID=13457530
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| JP8071334A Expired - Fee Related JP2977759B2 (en) | 1996-03-01 | 1996-03-01 | Exhaust gas dry treatment method and apparatus |
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| CN102350208B (en) * | 2011-06-30 | 2013-09-04 | 华北电力大学（保定） | Flue gas absorbent which simultaneously has functions of desulphurization and denitration and preparation method and application thereof |
| CN103736377B (en) * | 2014-01-02 | 2015-07-15 | 山东大学 | Method for gas-phase desulfurization of glue gas |
| JP5863885B2 (en) * | 2014-06-06 | 2016-02-17 | 三菱日立パワーシステムズ株式会社 | Boiler system and power plant including the same |
| CN105032093B (en) * | 2015-07-07 | 2017-03-01 | 江苏广鸿环境工程有限公司 | A kind of industrial boiler desulfurizing denitrating and integrating apparatus and technique |
| WO2018066079A1 (en) * | 2016-10-04 | 2018-04-12 | 中国電力株式会社 | Coal-fired power generation equipment |
| JP6559735B2 (en) * | 2017-05-02 | 2019-08-14 | 信六 西山 | Fine powder activated carbon regeneration method and fine powder activated carbon regeneration equipment |
| CN107816731A (en) * | 2017-11-21 | 2018-03-20 | 无锡市洗选设备厂 | A kind of coal particles drying process device |
| CN110075701A (en) * | 2018-01-26 | 2019-08-02 | 上海华芮环境工程技术有限公司 | A kind of dust removal integrated flue gas purifying technique of desulphurization denitration and system |
| CN108776192A (en) * | 2018-08-08 | 2018-11-09 | 国家能源投资集团有限责任公司 | Powdered activated coke device for evaluating performance |
| CN110131704A (en) * | 2019-05-15 | 2019-08-16 | 盐城中煤亚太机电设备制造有限公司 | A kind of industrial environment-protection boiler reducing exhaust gas discharge |
| CN112121614A (en) * | 2020-09-23 | 2020-12-25 | 山鹰国际控股股份公司 | Stable ultralow emission device and method for solid waste incineration flue gas |
| CN116272302A (en) * | 2023-03-30 | 2023-06-23 | 北京市弘洁蓝天科技股份有限公司 | System and method for treating waste activated carbon regenerated tail gas |
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| JPS5662518A (en) * | 1979-10-27 | 1981-05-28 | Kawasaki Heavy Ind Ltd | Treating method of exhaust gas |
| JPS6082124A (en) * | 1983-10-11 | 1985-05-10 | Sumitomo Heavy Ind Ltd | Stack gas desulphurization process |
| JP2655725B2 (en) * | 1989-07-10 | 1997-09-24 | 電源開発株式会社 | Exhaust gas treatment method for pulverized coal combustion boiler |
| JP3207019B2 (en) * | 1993-07-20 | 2001-09-10 | 株式会社神戸製鋼所 | How to remove harmful substances in exhaust gas |
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