JPH09108542A - Exhaust gas treating system - Google Patents

Exhaust gas treating system

Info

Publication number
JPH09108542A
JPH09108542A JP7268296A JP26829695A JPH09108542A JP H09108542 A JPH09108542 A JP H09108542A JP 7268296 A JP7268296 A JP 7268296A JP 26829695 A JP26829695 A JP 26829695A JP H09108542 A JPH09108542 A JP H09108542A
Authority
JP
Japan
Prior art keywords
exhaust gas
nitrogen oxides
nitric acid
tower
activated carbon
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.)
Pending
Application number
JP7268296A
Other languages
Japanese (ja)
Inventor
Takafuru Kobayashi
敬古 小林
Akinori Yasutake
昭典 安武
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Osaka Gas Co Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Osaka Gas Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd, Osaka Gas Co Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP7268296A priority Critical patent/JPH09108542A/en
Priority to EP96921096A priority patent/EP0779100B8/en
Priority to KR1019970701085A priority patent/KR100235854B1/en
Priority to DE69625887T priority patent/DE69625887T2/en
Priority to CN96190570A priority patent/CN1126594C/en
Priority to PCT/JP1996/001772 priority patent/WO1997001388A1/en
Priority to JP50431097A priority patent/JP3272366B2/en
Priority to AT96921096T priority patent/ATE231412T1/en
Priority to CA002193638A priority patent/CA2193638C/en
Publication of JPH09108542A publication Critical patent/JPH09108542A/en
Priority to US09/219,870 priority patent/US6106791A/en
Priority to US09/642,009 priority patent/US6814948B1/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Landscapes

  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

PROBLEM TO BE SOLVED: To remove nitrogen oxides (NOx ) and sulfur oxides (SOx ) contained in exhaust gas which is exhausted from a boiler, a gas turbine, an engine and a combustion furnace for burning various combustible materials. SOLUTION: Nitrogen oxides (NOx ) and sulfur oxides (SOx ) contained in exhaust gas exhausted from a boiler 11 are treated respectively as follows: nitrogen oxides (NOx ) are changed into nitric acid or nitrate in a denitration tower 22 filled with activated carbon fiber. Nitric acid or nitrate is recovered. Sulfur oxides (SOx ) are changed into sulfuric acid or sulfate in a desulfurization tower 23 filled with activated carbon fiber. Sulfuric acid or sulfate is recovered.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、各種燃焼を焼成さ
せるボイラ、ガスタービン、エンジン及び燃焼炉等から
排出される排ガス中の窒素酸化物(NOx )及び硫黄酸
化物(SOx )を除去する排ガスの処理システムに関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention removes nitrogen oxides (NO x ) and sulfur oxides (SO x ) in exhaust gas discharged from boilers, gas turbines, engines, combustion furnaces, etc. for burning various combustions. Exhaust gas treatment system.

【0002】[0002]

【従来の技術及】排ガス中の窒素酸化物(NOx )の除
去方法としては、排ガス中にアンモニアを添加し、触媒
上で反応を生成させて、窒素(N2 )と水(H2 O)と
に分解する選択還元脱硝方法が広く使用されている。
2. Description of the Related Art As a method of removing nitrogen oxides (NO x ) in exhaust gas, ammonia is added to the exhaust gas to cause a reaction on a catalyst to produce nitrogen (N 2 ) and water (H 2 O). ) And the selective reduction denitration method that decomposes into and are widely used.

【0003】図6に従来の排煙処理システムによる排ガ
ス処理の一例を説明する。図6中、符号01はボイラ、
02は脱硝装置、03は空気予熱器、04は集塵器、0
5は冷却塔、08はガス・ガスヒータ及び06は脱硫装
置を図示する。図6に示すように、ボイラ01等の出口
には、触媒を用いた脱硝装置02を設け、該脱硝装置0
2の出口に空気予熱器03を設置し、排ガス温度を13
0℃程度まで低減するようにしている。上記空気予熱器
03を通過した排ガスは、集塵器04で集塵された後、
冷却塔05でさらに温度を50℃程度まで低減して、脱
硫装置06に導き、ここで硫黄酸化物(SOx )を処理
した後、煙突07から排ガスを大気中に排出するように
している。
FIG. 6 illustrates an example of exhaust gas treatment by a conventional flue gas treatment system. In FIG. 6, reference numeral 01 is a boiler,
02 is a denitration device, 03 is an air preheater, 04 is a dust collector, 0
5 is a cooling tower, 08 is a gas / gas heater, and 06 is a desulfurizer. As shown in FIG. 6, a denitration device 02 using a catalyst is provided at the outlet of the boiler 01 and the like.
Install an air preheater 03 at the outlet of 2 and adjust the exhaust gas temperature to 13
The temperature is reduced to about 0 ° C. The exhaust gas that has passed through the air preheater 03 is collected by the dust collector 04,
In the cooling tower 05, the temperature is further reduced to about 50 ° C., the temperature is guided to the desulfurization device 06, where the sulfur oxide (SO x ) is treated, and then the exhaust gas is discharged from the chimney 07 to the atmosphere.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、従来の
排ガス処理方法では、上記脱硝装置02において、触媒
を使用するため、200℃以上,好ましくは300℃以
上の温度が必要となる。従って、加熱装置を設置するか
又は設置される場所に制限が生じる場合がある。
However, in the conventional exhaust gas treatment method, since the catalyst is used in the denitration device 02, a temperature of 200 ° C. or higher, preferably 300 ° C. or higher is required. Therefore, the heating device may be installed or a place may be limited.

【0005】また、脱硫装置06内では、排ガス中の硫
黄酸化物(SOx )は炭酸カルシウムを吸収剤として吸
収し、石膏として回収するいわゆる石灰石膏方法が使用
されているが、上記石灰石膏方法では多量の吸収剤が必
要であるという問題がある。
In the desulfurization unit 06, a so-called lime-gypsum method is used in which sulfur oxide (SO x ) in exhaust gas absorbs calcium carbonate as an absorbent and is recovered as gypsum. However, there is a problem that a large amount of absorbent is required.

【0006】本発明は上記問題に鑑み、加熱手段を必要
とせず低温で排ガス処理を可能とすると共に多量の吸収
剤を使用することなく排ガス処理を効率良く行うことが
できる排ガス処理システムを提供することを目的とす
る。
In view of the above problems, the present invention provides an exhaust gas treatment system which enables exhaust gas treatment at a low temperature without requiring a heating means and can efficiently perform exhaust gas treatment without using a large amount of absorbent. The purpose is to

【0007】[0007]

【課題を解決するための手段】前記目的を達成する本発
明の排ガス処理システムの構成は、窒素酸化物(N
x )及び硫黄酸化物(SOx )を含有する排ガスから
活性炭素繊維を用いて、上記窒素酸化物(NOx )を硝
酸又は硝酸塩として回収すると共に、上記硫黄酸化物
(SOx )を硫酸又は硫酸塩として回収することを特徴
とする。
[Means for Solving the Problems] The present invention for achieving the above-mentioned object
Ming's exhaust gas treatment system consists of nitrogen oxides (N
O x) And sulfur oxides (SOxFrom exhaust gas containing
Using activated carbon fiber, the above nitrogen oxide (NOx) To glass
It is recovered as an acid or nitrate, and the above-mentioned sulfur oxide
(SOx) Is recovered as sulfuric acid or sulfate.
And

【0008】上記排ガス処理システムにおいて、処理ガ
ス温度が100℃以下の低温であることを特徴とする。
The above exhaust gas treatment system is characterized in that the treatment gas temperature is a low temperature of 100 ° C. or lower.

【0009】上記排ガス処理システムにおいて、窒素酸
化物(NOx )を硝酸又は硝酸塩として回収する際に、
湿度を80%以下であることを特徴とする。
In the above exhaust gas treatment system, when recovering nitrogen oxides (NO x ) as nitric acid or nitrates,
The humidity is 80% or less.

【0010】上記排ガス処理システムにおいて、硫黄酸
化物(SOx )を硫酸又は硫酸塩として回収する際に、
湿度を100%以上であることを特徴とする。
In the above exhaust gas treatment system, when the sulfur oxide (SO x ) is recovered as sulfuric acid or sulfate,
The humidity is 100% or more.

【0011】〔作用〕先ず、排ガス中の窒素酸化物(N
x )を処理する方法としては、排ガスの温度を100
℃以下とし、しかも排ガスの湿度を80%以下、好まし
くは、60%以下にする。その後、活性炭素繊維が充填
された反応器に導き、該活性炭素繊維の表面にて上記排
ガス中の窒素酸化物(NOx )を酸化して二酸化窒素
(NO2),五酸化二窒素(N2 5 )とする。次い
で、この二酸化窒素(NO2 ),五酸化二窒素(N2
5 )を水分又はナトリウム等の塩類の水溶液と反応させ
て、硝酸又は硝酸塩として回収することにより、排ガス
中の窒素酸化物(NOx )を除去する。また、排ガス中
の硫黄酸化物(SOx )を処理する方法としては、排ガ
スの温度を100℃以下、好ましくは50℃以下とし、
しかも排ガスの湿度を100%以上にする。その後、活
性炭素繊維が充填された反応器に導き、該活性炭素繊維
の表面にて上記排ガス中の硫黄酸化物(SOx )を酸化
して三酸化硫黄(SO3)とする。次いで、この三酸化
硫黄(SO3 )を水分又はナトリウム等の塩類の水溶液
と反応させて、硫酸又は硫酸塩として回収することによ
り、排ガス中の硫黄酸化物(SOx )を除去する。
[Operation] First, nitrogen oxides (N
The method for treating O x ) is as follows:
C. or lower, and the humidity of exhaust gas is 80% or lower, preferably 60% or lower. After that, it is introduced into a reactor filled with activated carbon fibers, and nitrogen oxides (NO x ) in the exhaust gas are oxidized on the surface of the activated carbon fibers to oxidize nitrogen dioxide (NO 2 ), dinitrogen pentoxide (N 2 ). 2 O 5 ). Then, the nitrogen dioxide (NO 2 ) and dinitrogen pentoxide (N 2 O
Nitrogen oxides (NO x ) in the exhaust gas are removed by reacting 5 ) with water or an aqueous solution of a salt such as sodium to recover nitric acid or a nitrate. As a method of treating sulfur oxide (SO x ) in exhaust gas, the temperature of exhaust gas is set to 100 ° C. or lower, preferably 50 ° C. or lower,
Moreover, the humidity of the exhaust gas is set to 100% or more. Then, it is introduced into a reactor filled with activated carbon fibers, and the sulfur oxides (SO x ) in the exhaust gas are oxidized on the surfaces of the activated carbon fibers to sulfur trioxide (SO 3 ). Next, this sulfur trioxide (SO 3 ) is reacted with an aqueous solution of water or a salt such as sodium to recover it as sulfuric acid or a sulfate, thereby removing sulfur oxide (SO x ) in the exhaust gas.

【0012】[0012]

【発明の実施の形態】以下、本発明の実施の形態例を詳
細に説明するが、本発明はこれに限定されるものではな
い。
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below, but the present invention is not limited thereto.

【0013】<第1の実施の形態例>図1に本発明の第
1の排煙処理システムの実施の形態例を示す。図1中、
符号11はボイラ、14は集塵器、15はガス・ガスヒ
ータ、21は酸化塔、22は硝酸塔及び23は脱硫塔を
各々図示する。図1に示すように、ボイラ11等の出口
に集塵器14を設け、該集塵器14を通過した排ガス
は、ガス・ガスヒータ15でガス温度を90℃程度まで
低減し、しかも排ガスの湿度を80%以下(好ましくは
60%以下)とし、その排ガスを酸化塔21内に導く。
この酸化塔21内には、コルゲート状とした活性炭素繊
維が充填されており、排ガス中の窒素酸化物(NOx
を酸化して二酸化窒素(NO2 ),五酸化二窒素(N2
5 )とし(下記「化1」)、次いで、硝酸塔22内で
二酸化窒素(NO2 ),五酸化二窒素(N2 5 )を含
有する排ガスを水と反応させて、硝酸を生成し(下記
「化2」)、排ガス中の窒素酸化物(NOx )を除去す
るようにしている。
<First Embodiment> FIG. 1 shows an embodiment of the first flue gas treatment system of the present invention. In FIG.
Reference numeral 11 is a boiler, 14 is a dust collector, 15 is a gas / gas heater, 21 is an oxidation tower, 22 is a nitric acid tower, and 23 is a desulfurization tower. As shown in FIG. 1, a dust collector 14 is provided at the outlet of the boiler 11 or the like, and the exhaust gas that has passed through the dust collector 14 is reduced in temperature by the gas / gas heater 15 to about 90 ° C. Is 80% or less (preferably 60% or less), and the exhaust gas is introduced into the oxidation tower 21.
The oxidizing tower 21 is filled with corrugated activated carbon fibers, and nitrogen oxides (NO x ) in the exhaust gas are filled.
To oxidize nitrogen dioxide (NO 2 ), dinitrogen pentoxide (N 2
O 5 ) (“Chemical formula 1” below), and then the exhaust gas containing nitrogen dioxide (NO 2 ) and dinitrogen pentoxide (N 2 O 5 ) is reacted with water in the nitric acid tower 22 to generate nitric acid. However, the nitrogen oxides (NO x ) in the exhaust gas are removed (Chemical formula 2 below).

【0014】[0014]

【化1】NO + 1/2O2 → NO2 4NO +3O2 → 2N2 5 [Chemical formula 1] NO + 1 / 2O 2 → NO 2 4NO + 3O 2 → 2N 2 O 5

【0015】[0015]

【化2】NO2 + H2 O → HNO32 5 + H2 O → 2HNO3 [Chemical formula 2] NO 2 + H 2 O → HNO 3 N 2 O 5 + H 2 O → 2HNO 3

【0016】また、一方上記硝酸塔22内において、水
の代わりにナトリウム等の水溶液で反応させることによ
り、硝酸として処理する代わりに、硝酸ナトリウム等の
塩類として回収することもできる。
On the other hand, in the nitric acid tower 22, by reacting with an aqueous solution of sodium or the like instead of water, it is possible to recover salts such as sodium nitrate instead of treating as nitric acid.

【0017】その後、上記窒素酸化物(NOx )が除去
された排ガスは、当該硝酸塔22内で加湿され、ガス中
の湿度を100%以上とした後、更に、コルゲート状と
した活性炭素繊維を充填した脱硫塔23内に送られ、こ
こで硫黄酸化物(SOx )を酸化して三酸化硫黄(SO
3 )とし(下記「化3」)、次いで、水と反応させて硫
酸として(下記「化4」)、窒素酸化物(NOx )が除
去された排ガス中の硫黄酸化物(SOx )を除去するよ
うにしている。その後、ガス・ガスヒータ15に導か
れ、加熱されて煙突から排出される。なお、排ガスの温
度は100℃以下、好ましくは50℃以下の低温として
いる。
After that, the exhaust gas from which the nitrogen oxides (NO x ) have been removed is humidified in the nitric acid tower 22, the humidity in the gas is set to 100% or more, and then the corrugated activated carbon fiber is further added. Is sent to the desulfurization tower 23, where sulfur oxide (SO x ) is oxidized and sulfur trioxide (SO x
3 ) (“Chemical formula 3” below), and then reacted with water as sulfuric acid (“Chemical formula 4” below) to remove sulfur oxides (SO x ) in the exhaust gas from which nitrogen oxides (NO x ) have been removed. I am trying to remove it. Then, it is guided to the gas / gas heater 15, heated, and discharged from the chimney. The temperature of the exhaust gas is 100 ° C. or lower, preferably 50 ° C. or lower.

【0018】[0018]

【化3】SO2 + 1/2O2 → SO3 [Chemical formula 3] SO 2 + 1 / 2O 2 → SO 3

【0019】[0019]

【化4】SO3 + H2 O → H2 SO4 [Chemical 4] SO 3 + H 2 O → H 2 SO 4

【0020】この硫黄酸化物(SOx )を除去の場合
も、上記窒素酸化物(NOx )を除去と同様に、上記脱
硫塔23内において、水の代わりにナトリウム等の水溶
液で反応させることにより、硫酸の代わりに硫酸ナトリ
ウム等の塩類として回収することもできる。
Also in the case of removing this sulfur oxide (SO x ), as in the case of removing the nitrogen oxide (NO x ), in the desulfurization tower 23, a reaction is carried out with an aqueous solution of sodium or the like instead of water. Thus, instead of sulfuric acid, it is possible to recover salts such as sodium sulfate.

【0021】ここで、上記硝酸塔22及び硫酸塔23内
に充填する活性炭素繊維とは、ピッチ系活性炭素繊維を
還元雰囲気の条件で焼成してなるものであるが、窒素酸
化物(NOx )処理用の場合には、約850℃で一時間
焼成したものを用い、一方の硫黄酸化物(SOx )処理
用の場合には、約1100℃で一時間焼成したものを用
い、各々コルゲート状に成形したものを本実施の形態例
では用いているが、本発明はこれに限定されるものでは
ない。図2は、窒素酸化物の二酸化窒素(NO2 )への
酸化性能を示す。同図に示すように、安定して80%以
上の高性能が得られる。
Here, the activated carbon fibers filled in the nitric acid tower 22 and the sulfuric acid tower 23 are obtained by firing pitch-based activated carbon fibers in a reducing atmosphere, and nitrogen oxides (NO x ) In the case of treatment, the one calcined at about 850 ° C. for 1 hour is used, and in the case of the treatment for sulfur oxide (SO x ), the one calcined at about 1100 ° C. for one hour is used. Although the molded product is used in this embodiment, the present invention is not limited to this. FIG. 2 shows the oxidation performance of nitrogen oxides to nitrogen dioxide (NO 2 ). As shown in the figure, a high performance of 80% or more is stably obtained.

【0022】また、図3は硫黄酸化物(SO2 )の酸化
硫黄(SO3 )への酸化特性を示す。同図に示すよう
に、安定して95%以上の高性能が得られる。
FIG. 3 shows the oxidation characteristics of sulfur oxide (SO 2 ) to sulfur oxide (SO 3 ). As shown in the figure, a high performance of 95% or more is stably obtained.

【0023】<第2の実施の形態例>図4には、本発明
の第2の排煙処理システムの実施の形態例を示す。図4
に示すように、ボイラ11等の出口には脱硝装置12を
設け該脱硝装置12出口に空気予熱器13を設置し、排
ガス温度を130℃程度まで低減するようにしている。
<Second Embodiment> FIG. 4 shows an embodiment of the second flue gas treatment system of the present invention. FIG.
As shown in, a denitration device 12 is provided at the outlet of the boiler 11 and the like, and an air preheater 13 is installed at the outlet of the denitration device 12 to reduce the exhaust gas temperature to about 130 ° C.

【0024】本実施の形態例では、従来の脱硝装置12
によって脱硝処理を行った後、更に排ガス中の窒素酸化
物(NOx )の処理を行うものである。図4に示すよう
に、高温処理による脱硝装置12によって脱硝処理を行
った後、上記空気予熱器13を通過した排ガスは、集塵
器14で集塵された後、ガス・ガスヒータ15でさらに
温度を90℃程度まで低減して、第1の実施の形態例と
同様に、その排ガスをコルゲート状に成形した活性炭素
繊維を充填した窒素酸化物(NOx )を硝酸又は硝酸塩
として回収する酸化塔21で処理することにより、排ガ
ス中の残りの窒素酸化物(NOx )を酸化し、次いで、
硝酸塔22で二酸化窒素(NO2 ),五酸化二窒素(N
2 5 )を含有する排ガスを水と反応させて、硝酸を生
成し、窒素酸化物(NOx )を除去するようにしてい
る。
In this embodiment, the conventional denitration device 12 is used.
After the denitration treatment is performed by the method, the nitrogen oxide (NO x ) in the exhaust gas is further treated. As shown in FIG. 4, the exhaust gas that has passed through the air preheater 13 after being subjected to the denitration treatment by the denitration device 12 by the high temperature treatment is dust-collected by the dust collector 14, and then further heated by the gas / gas heater 15. Is reduced to about 90 ° C., and as in the case of the first embodiment, an oxidation tower for recovering nitrogen oxides (NO x ) filled with activated carbon fibers formed by corrugating the exhaust gas as nitric acid or nitrates. 21 to oxidize residual nitrogen oxides (NO x ) in the exhaust gas, and then
In the nitric acid tower 22, nitrogen dioxide (NO 2 ), dinitrogen pentoxide (N 2
The exhaust gas containing 2 O 5 ) is reacted with water to generate nitric acid and remove nitrogen oxides (NO x ).

【0025】これにより、従来より使用されている脱硝
装置に接続して、脱硝性能を更に向上させることがで
き、更に処理能力が向上する。尚、同様にして従来の脱
硫装置を備えたシステムに対しても本システムを接続す
ることにより、脱硫性能を更に向上させることができ
る。
As a result, it is possible to further improve the denitration performance by connecting to a denitration device that has been conventionally used, and further improve the processing capacity. Similarly, by connecting this system to a system including a conventional desulfurization device, the desulfurization performance can be further improved.

【0026】<第3の実施の形態例>図5に本発明の第
3の排煙処理システムの実施の形態例を示す。図5に示
すように、ボイラ排ガスが集塵器14で集塵された後、
ガス・ガスヒータ15でさらに温度を90℃程度まで低
減して後、再度、冷却塔31に送られ、ここで加湿冷却
され排ガス温度を50℃以下とすると共に、湿度を10
0%以上とし、その低温高湿の排ガスをコルゲート状に
成形した活性炭素繊維を充填した脱硫塔23内に送り、
ここで硫黄酸化物(SOx )を硫酸又は硫酸塩として回
収するようにしている。本実施の形態例では、脱硫塔2
3で該硫黄酸化物(SOx )を酸化し、水と反応させ
て、硫酸を生成し、硫黄酸化物(SOx )を除去するよ
うにしている。
<Third Embodiment> FIG. 5 shows an embodiment of a third flue gas treatment system according to the present invention. As shown in FIG. 5, after the boiler exhaust gas is collected by the dust collector 14,
After the temperature is further reduced to about 90 ° C. by the gas / gas heater 15, it is sent to the cooling tower 31 again, where it is humidified and cooled to reduce the exhaust gas temperature to 50 ° C. or lower and the humidity to 10 ° C.
0% or more, the low temperature and high humidity exhaust gas is sent into a desulfurization tower 23 filled with activated carbon fibers molded into a corrugated shape,
Here, the sulfur oxide (SO x ) is recovered as sulfuric acid or sulfate. In the present embodiment example, the desulfurization tower 2
In 3, the sulfur oxide (SO x ) is oxidized and reacted with water to generate sulfuric acid, and the sulfur oxide (SO x ) is removed.

【0027】この硫黄酸化物(SOx )を除去した排ガ
スは、再び、冷却塔であるガス・ガスヒータ15に送ら
れ、ここで90℃程度まで排ガス温度を上昇して、活性
炭素繊維を充填した脱硝塔21内において、排ガス中の
窒素酸化物(NOx )を酸化して二酸化窒素(NO2
とし、硝酸塔22で硝酸と窒素酸化物を除去するように
している。
The exhaust gas from which the sulfur oxide (SO x ) has been removed is sent again to the gas / gas heater 15 which is a cooling tower, where the exhaust gas temperature is raised to about 90 ° C. and the activated carbon fiber is filled. In the denitration tower 21, nitrogen oxides (NO x ) in the exhaust gas are oxidized to produce nitrogen dioxide (NO 2 ).
The nitric acid tower 22 removes nitric acid and nitrogen oxides.

【0028】[0028]

【発明の効果】以上述べたように、本発明によれば、窒
素酸化物及び硫黄酸化物を含有する排ガスから活性炭素
繊維を用いることにより、100℃以下の低温条件でガ
ス処理することができる。
As described above, according to the present invention, by using the activated carbon fiber from the exhaust gas containing the nitrogen oxide and the sulfur oxide, the gas treatment can be performed under the low temperature condition of 100 ° C. or less. .

【0029】よって、現在使用されている脱硝装置及び
脱硫装置の代替として使用するか、又は現状より脱硝性
能又は脱硫性能を向上する必要がある場合には、本シス
テムを追加して設けることにより、更に処理能力が向上
する。
Therefore, when it is used as a substitute for the currently used denitration equipment and desulfurization equipment, or when it is necessary to improve the denitration performance or desulfurization performance from the current situation, by adding this system, Further, the processing capacity is improved.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に係る第1の実施の形態例の排煙処理シ
ステムの概略図である。
FIG. 1 is a schematic diagram of a flue gas treatment system according to a first embodiment of the present invention.

【図2】窒素酸化物の二酸化窒素(NO2 )への酸化性
能図である。
FIG. 2 is an oxidation performance diagram of nitrogen oxides to nitrogen dioxide (NO 2 ).

【図3】硫黄酸化物(SO2 )の酸化硫黄(SO3 )へ
の酸化特性図である。
FIG. 3 is an oxidation characteristic diagram of sulfur oxide (SO 2 ) to sulfur oxide (SO 3 ).

【図4】本発明に係る第2の実施の形態例の排煙処理シ
ステムの概略図である。
FIG. 4 is a schematic diagram of a flue gas treatment system according to a second embodiment of the present invention.

【図5】本発明に係る第3の実施の形態例の排煙処理シ
ステムの概略図である。
FIG. 5 is a schematic diagram of a flue gas treatment system according to a third embodiment of the present invention.

【図6】従来に係る排煙処理システムの概略図である。FIG. 6 is a schematic diagram of a conventional flue gas treatment system.

【符号の説明】[Explanation of symbols]

11 ボイラ 12 脱硝装置 13 空気予熱器 14 集塵器 15 ガス・ガスヒータ 21 酸化塔 22 硝酸塔 23 脱硫塔 31 冷却塔 11 Boiler 12 Denitration device 13 Air preheater 14 Dust collector 15 Gas / gas heater 21 Oxidation tower 22 Nitric acid tower 23 Desulfurization tower 31 Cooling tower

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 窒素酸化物(NOx )及び硫黄酸化物
(SOx )を含有する排ガスから活性炭素繊維を用い
て、上記窒素酸化物(NOx )を硝酸又は硝酸塩として
回収すると共に、上記硫黄酸化物(SOx )を硫酸又は
硫酸塩として回収することを特徴とする排ガス処理シス
テム。
1. The above-mentioned nitrogen oxide (NO x ) is recovered as nitric acid or nitrate by using activated carbon fiber from an exhaust gas containing nitrogen oxide (NO x ) and sulfur oxide (SO x ), and An exhaust gas treatment system, wherein sulfur oxide (SO x ) is recovered as sulfuric acid or a sulfate.
【請求項2】 請求項1記載の排ガス処理システムにお
いて、処理ガス温度が100℃以下の低温であることを
特徴とする排ガス処理システム。
2. The exhaust gas treatment system according to claim 1, wherein the treatment gas temperature is a low temperature of 100 ° C. or lower.
【請求項3】 請求項1及び2記載の排ガス処理システ
ムにおいて、窒素酸化物(NOx )を硝酸又は硝酸塩と
して回収する際に、湿度が80%以下であることを特徴
とする排ガス処理システム。
3. The exhaust gas treatment system according to claim 1 or 2, wherein the humidity is 80% or less when recovering nitrogen oxides (NO x ) as nitric acid or nitrate.
【請求項4】 請求項1〜3記載の排ガス処理システム
において、硫黄酸化物(SOx )を硫酸又は硫酸塩とし
て回収する際に、湿度が100%以上であることを特徴
とする排ガス処理システム。
4. The exhaust gas treatment system according to any one of claims 1 to 3, wherein the humidity is 100% or more when the sulfur oxides (SO x ) are recovered as sulfuric acid or sulfate. .
JP7268296A 1995-06-28 1995-10-17 Exhaust gas treating system Pending JPH09108542A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
JP7268296A JPH09108542A (en) 1995-10-17 1995-10-17 Exhaust gas treating system
PCT/JP1996/001772 WO1997001388A1 (en) 1995-06-28 1996-06-27 Flue-gas treatment system
KR1019970701085A KR100235854B1 (en) 1995-06-28 1996-06-27 Flue-gas treatment system
DE69625887T DE69625887T2 (en) 1995-06-28 1996-06-27 METHOD FOR THE NICKELING AND DESULFURATION OF EXHAUST GAS
CN96190570A CN1126594C (en) 1995-06-28 1996-06-27 Flue-gas treatment system
EP96921096A EP0779100B8 (en) 1995-06-28 1996-06-27 Flue-gas denitration und desulfurization processes
JP50431097A JP3272366B2 (en) 1995-06-28 1996-06-27 Exhaust gas treatment system
AT96921096T ATE231412T1 (en) 1995-06-28 1996-06-27 METHOD FOR DITOXIFICATION AND DESULPHURIZATION OF EXHAUST GAS
CA002193638A CA2193638C (en) 1995-06-28 1996-06-27 Exhaust gas treating systems
US09/219,870 US6106791A (en) 1995-06-28 1998-12-24 Exhaust gas treating systems
US09/642,009 US6814948B1 (en) 1995-06-28 2000-08-21 Exhaust gas treating systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7268296A JPH09108542A (en) 1995-10-17 1995-10-17 Exhaust gas treating system

Publications (1)

Publication Number Publication Date
JPH09108542A true JPH09108542A (en) 1997-04-28

Family

ID=17456561

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7268296A Pending JPH09108542A (en) 1995-06-28 1995-10-17 Exhaust gas treating system

Country Status (1)

Country Link
JP (1) JPH09108542A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002081064A1 (en) 2001-04-04 2002-10-17 Osaka Gas Co., Ltd. Desulfurizer and method of desulfurization

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002081064A1 (en) 2001-04-04 2002-10-17 Osaka Gas Co., Ltd. Desulfurizer and method of desulfurization
AU2002244966B2 (en) * 2001-04-04 2004-03-25 Mitsubishi Heavy Industries, Ltd. Desulfurizer and method of desulfurization
US7029639B2 (en) 2001-04-04 2006-04-18 Osaka Gas Co., Ltd. Desulfurizer comprising activated carbon and method of desulfurization

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