JPH07256051A - Desulfurization of so3-containing exhaust gas - Google Patents

Desulfurization of so3-containing exhaust gas

Info

Publication number
JPH07256051A
JPH07256051A JP6057096A JP5709694A JPH07256051A JP H07256051 A JPH07256051 A JP H07256051A JP 6057096 A JP6057096 A JP 6057096A JP 5709694 A JP5709694 A JP 5709694A JP H07256051 A JPH07256051 A JP H07256051A
Authority
JP
Japan
Prior art keywords
exhaust gas
absorbent
gas
slurry
alkali
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
JP6057096A
Other languages
Japanese (ja)
Inventor
Akira Nanba
明良 南波
Kazutaka Tomimatsu
一隆 富松
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
Original Assignee
Mitsubishi Heavy Industries 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 filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP6057096A priority Critical patent/JPH07256051A/en
Publication of JPH07256051A publication Critical patent/JPH07256051A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To desulfurize SO3-containing exhaust gas by a slurried absorbent without producing SO3 mist CONSTITUTION:SO3-containing exhaust gas is passed through a reticulated passage 2 through which solid CaO is passed to remove SO3 in the exhaust gas. CaO having SO3 adsorbed thereon and new CaO 19 are mixed with water in a slaking tank 7 to prepare an alkali absorbent which is, in turn, sprayed into the exhaust gas from a slurry spraying part 12 to remove SO3.

Description

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

【0001】[0001]

【産業上の利用分野】本発明はSO3 を含む排ガスに適
用される脱硫方法に関する。
The present invention relates to a desulfurization method applied to exhaust gas containing SO 3 .

【0002】[0002]

【従来の技術】従来実施されているアルカリスラリ噴霧
による脱硫においては、SO2 はスラリ吸収剤と反応し
吸着されるが、SO3 ガスはガス中へのスラリ噴霧によ
るガス中の湿度の上昇、ガス温度低下により極めて微細
な硫酸ミストとなる為、吸収剤との反応が難しくこの硫
酸ミストは下流へ通過してしまう。通過した硫酸ミスト
は下流機器の腐食の原因及び工場近辺への硫酸ミストの
落下につながる。
2. Description of the Related Art In conventional desulfurization by spraying alkaline slurry, SO 2 reacts with a slurry absorbent and is adsorbed, but SO 3 gas increases in humidity in the gas by spraying slurry into the gas. Because the sulfuric acid mist becomes extremely fine due to the decrease in gas temperature, it is difficult to react with the absorbent, and this sulfuric acid mist passes downstream. The passed sulfuric acid mist causes the corrosion of downstream equipment and causes the sulfuric acid mist to fall near the factory.

【0003】従って、排ガス中にSO3 ミストを吸着す
るダストすなわちフライアッシュ等が少ない油焚ボイラ
排ガスでは特にスラリ噴霧によりSO3 ガスはミスト化
する為、スラリ噴霧後は腐食が問題であった。
Therefore, in the case of an oil-fired boiler exhaust gas in which a small amount of dust that absorbs SO 3 mist in the exhaust gas, that is, fly ash, etc., SO 3 gas is converted into a mist especially by slurry spraying, so that there is a problem of corrosion after slurry spraying.

【0004】[0004]

【発明が解決しようとする課題】本発明はSO3 ガスを
含む排ガス中からSO3 ミストを発生させることなくア
ルカリスラリ吸収剤によって脱硫を行うことのできる脱
硫方法を提供することを課題としている。
SUMMARY OF THE INVENTION It is an object of the present invention to provide a desulfurization method capable of desulfurizing an exhaust gas containing SO 3 gas with an alkaline slurry absorbent without generating SO 3 mist.

【0005】[0005]

【課題を解決するための手段】本発明においては、アル
カリスラリ吸収剤を排ガス中に噴霧する前にSO3 ガス
を固形のアルカリ吸収材すなわちCaO等の固形物と接
触させることにより予め吸着反応させ低減させておき、
スラリ吸収剤噴霧による硫酸ミストの発生を抑えること
でスラリ吸収剤噴霧部以降に配設された機器の腐食低減
をはかる。
In the present invention, SO 3 gas is brought into contact with a solid alkali absorbent, that is, a solid substance such as CaO to cause an adsorption reaction before spraying the alkali slurry absorbent into the exhaust gas. Reduce it,
By suppressing the generation of sulfuric acid mist due to the spray of the slurry absorbent, the corrosion of the equipment arranged after the spray portion of the slurry absorbent can be reduced.

【0006】こうしてSO3 を吸着させて反応生成物を
含むアルカリ吸収材は必要に応じ新しいアルカリ吸収材
を添加して水と混合させてアルカリ吸収材とし、前記し
た吸着反応によりSO3 を低減させた後の排ガス中のS
2 を吸収するのに用いる。
In this way, the alkali absorbent containing SO 3 adsorbed and containing the reaction product is mixed with water by adding a new alkali absorbent as needed to form an alkali absorbent, and SO 3 is reduced by the above-mentioned adsorption reaction. In exhaust gas after
Used to absorb O 2 .

【0007】本発明において、SO3 ガスを吸着するた
めの固形のアルカリ吸収材としては、図1に示すよう
に、ガス通過煙道1の中にSO3 吸着・反応用のアルカ
リ吸収材を通過させる網状通路2を設けたものとしてよ
い。この網状通路2はメッシュ状の金網で粉体通路を作
ったもので以下、図1によりこれを具体的に説明する。
In the present invention, as the solid alkali absorbent for adsorbing SO 3 gas, as shown in FIG. 1, the alkali absorbent for SO 3 adsorption / reaction is passed through the gas passage flue 1. The mesh passage 2 may be provided. The mesh passage 2 is a powder passage made of a mesh-like wire mesh, and this will be specifically described below with reference to FIG.

【0008】網状通路2の上部には固形のアルカリ吸収
材例えばCaOを充填した上部ホッパ3を設けてあり、
上部ホッパ3からアルカリ吸収材は煙道1中の網状通路
2に充満されながら通過し、下部ホッパ4へ流れるよう
にする。
An upper hopper 3 filled with a solid alkali absorbent such as CaO is provided above the mesh passage 2.
The alkali absorbent from the upper hopper 3 passes through while being filled in the mesh passage 2 in the flue 1, and flows into the lower hopper 4.

【0009】下部ホッパ4には、アルカリ吸収材切出し
用フィーダ5が設置され、このフィーダ5によるアルカ
リ吸収材の切り出し量により網状通路2を通って下方に
流れるアルカリ吸収材の速度が決まる。
A feeder 5 for cutting out the alkali absorbent is installed in the lower hopper 4, and the amount of the alkali absorbent cut out by the feeder 5 determines the speed of the alkali absorbent flowing downward through the mesh passage 2.

【0010】このようにして、網状通路2を通過し下部
ホッパ4に堆積したアルカリ吸収材及び反応生成物は、
下部ホッパ4下部の切換シュート6により、再度上部ホ
ッパ3に循環させるかあるいは、スラリ吸収剤製造用ス
レーキングタンク7へ運ばれ、原料ホッパ13からのア
ルカリ吸収材と工水が注入されスレーキングされる。
In this way, the alkali absorbent and the reaction product which have passed through the mesh passage 2 and deposited on the lower hopper 4 are
By the switching chute 6 below the lower hopper 4, it is circulated to the upper hopper 3 again, or is carried to the slurry absorbent manufacturing slaking tank 7, where the alkaline absorbent and the working water from the raw material hopper 13 are injected for slaking.

【0011】スレーキングタンク7には攪拌機8が具備
され、タンク内でスレーキングされたスラリ10はスラ
リポンプ9を介して網状通路2を設置した煙道1の下流
に噴霧される。
The slaking tank 7 is equipped with a stirrer 8, and the slurry 10 slaked in the tank is sprayed via a slurry pump 9 to the downstream of the flue 1 having the mesh passage 2.

【0012】なお、図1には記載されていないが、Ca
O固形物の表面にはSO3 を吸着したCaSO4 の層が
出来るため、スレーキングを容易にするために、該固形
物をミル等で粉砕する構成としてもよいことは言うまで
もない。図1で13は原料生石灰のホッパである。
Although not shown in FIG. 1, Ca
Since a layer of CaSO 4 adsorbing SO 3 is formed on the surface of the O solid matter, it goes without saying that the solid matter may be pulverized by a mill or the like in order to facilitate slaking. In FIG. 1, 13 is a hopper for raw quicklime.

【0013】[0013]

【作用】本発明の脱硫方法において、SO3 を含有する
排ガスは固形のアルカリ吸収材と接触されることによっ
て排ガス中SO3 はアルカリ吸収材に物理的に吸着され
るか以下のように化学的に反応し、ガス中のSO3 は低
減される。
In the desulfurization method of the present invention, the exhaust gas containing SO 3 is brought into contact with the solid alkali absorbent so that SO 3 in the exhaust gas is physically adsorbed by the alkali absorbent or chemically treated as follows. And SO 3 in the gas is reduced.

【0014】SO3 +CaO→CaSO4 SO3 を吸着反応させた反応生成物を含むアルカリ吸着
材は未反応のCaOと共に水と混合してアルカリ吸収剤
にされ、SO3 吸着後の排ガス中に噴霧されて次の反応
により排ガス中のSO2 を除去する。
The alkali adsorbent containing the reaction product obtained by the adsorption reaction of SO 3 + CaO → CaSO 4 SO 3 is mixed with unreacted CaO and water to form an alkali absorbent, which is sprayed into the exhaust gas after SO 3 adsorption. The SO 2 in the exhaust gas is removed by the following reaction.

【0015】 Ca(OH)2 +SO2 →CaSO3 +H2 O このように、本発明の脱硫方法では、SO3 低減過程で
使用したアルカリ吸収材は、SO2 吸収用スラリ原料と
して有効に利用される。
Ca (OH) 2 + SO 2 → CaSO 3 + H 2 O As described above, in the desulfurization method of the present invention, the alkali absorbent used in the SO 3 reduction process is effectively used as a raw material for SO 2 absorption slurry. It

【0016】以上の作用を前に説明した図1に示した装
置について少し具体的に説明する。ガス煙道1中に設け
られている網状通路2をアルカリ吸収剤が上から下へ層
状に移動し、横方向からガスがアルカリ吸収剤の層を通
過することにより、ガス中のSO3 が除去される。
The above-mentioned operation of the apparatus shown in FIG. 1 which has been described above will be described more specifically. The alkali absorbent moves in layers from top to bottom in the mesh passage 2 provided in the gas flue 1, and the gas passes laterally from the alkali absorbent layer to remove SO 3 in the gas. To be done.

【0017】SO3 を吸着反応させたアルカリ吸収材
は、網状通路2を下方に移動し下部ホッパ4に落下し下
部ホッパ4より切出し用フィーダ5を介して排出され
る。排出されたSO3 を吸着反応させた反応生成物を含
むアルカリ吸収材は切換シュート6によりコンベヤ11
にて上部ホッパ3に戻され、再び網状通路2を通過する
ことでガス中を循環する。
The alkali absorbent having adsorbed and reacted with SO 3 moves downward in the mesh passage 2 and falls into the lower hopper 4, and is discharged from the lower hopper 4 through the cutting feeder 5. The alkali absorbent containing the reaction product obtained by the adsorption reaction of the discharged SO 3 is conveyed by the switching chute 6 to the conveyor 11
Is returned to the upper hopper 3 and passes through the mesh passage 2 again to circulate in the gas.

【0018】ガス中を循環し、SO3 を吸着・反応し劣
化したアルカリ吸収材は、切換シュート6によりスラリ
吸収剤の原料としてスレーキングタンク7に移される。
The alkali absorbent, which circulates in the gas and is adsorbed and reacted with SO 3 and deteriorated, is transferred by the switching chute 6 to the slaking tank 7 as a raw material of the slurry absorbent.

【0019】網状通路2を通過しSO3 を低減されたガ
スは下流で、未反応のCaOを消和したCa(OH)2
スラリ吸収剤をスラリ噴霧部12から噴霧することでS
2を吸収反応される。
The gas, which has passed through the mesh passage 2 and whose SO 3 has been reduced, has Ca (OH) 2 which has absorbed unreacted CaO in the downstream.
By spraying the slurry absorbent from the slurry spray section 12, S
O 2 is absorbed and reacted.

【0020】スラリ吸収剤は、CaOすなわちSO3
着に使用した残存分と新しいCaO及びSO3 を吸着反
応させた反応生成物CaSO4 を原材にスレーキングタ
ンク7で消和され製造される。
The slurry absorbent is produced by dissolving in the slaking tank 7 the reaction product CaSO 4, which is the reaction product of CaO, that is, the residual component used for SO 3 adsorption, and the new CaO and SO 3, for adsorption reaction.

【0021】[0021]

【実施例】以下、本発明による脱硫方法の実施の態様を
図2により具体的に説明する。図2において、図1に示
した機器構成と同じ部分には同じ符号を付してあり、そ
れらについての重複する説明は省略する。図2におい
て、14は脱硫すべきSO3 含有排ガスを発生するガス
発生源、15は蒸発反応塔、16は集塵機、17は吸込
ファン、18は煙突を示している。19はアルカリ吸収
材としての生石灰、20は蒸発反応塔15と集塵機16
から出るダストの輸送装置である。
EXAMPLE An embodiment of the desulfurization method according to the present invention will be specifically described below with reference to FIG. In FIG. 2, the same parts as those of the device configuration shown in FIG. 1 are designated by the same reference numerals, and the duplicated description thereof will be omitted. In FIG. 2, 14 is a gas generation source for generating SO 3 -containing exhaust gas to be desulfurized, 15 is an evaporation reaction tower, 16 is a dust collector, 17 is a suction fan, and 18 is a chimney. 19 is quick lime as an alkali absorbent, 20 is an evaporation reaction tower 15 and a dust collector 16
Is a device for transporting dust emitted from.

【0022】図2に示す実施態様は、生石灰を吸収材と
して使用した場合の例である。図2においてガス発生源
14より発生したガスは、後流に設置された吸込ファン
17により煙道1を流れ、図1に示したと同様の網状通
路2に充填された生石灰の粉末間を通過し、ガス中のS
3 が生石灰粉末により吸着、反応され低減される。
The embodiment shown in FIG. 2 is an example in which quicklime is used as an absorbent. In FIG. 2, the gas generated from the gas generation source 14 flows through the flue 1 by the suction fan 17 installed in the downstream, and passes between the quicklime powders filled in the mesh passage 2 similar to that shown in FIG. , S in gas
O 3 is adsorbed and reacted by the quick lime powder and reduced.

【0023】低減率は、石炭焚ボイラでのフライアッシ
ュによるSO3 の低減から推定して、80%以上と予想
される。SO3 を低減されたガスは、網状通路2を循環
しSO3 を吸着しCaSO4 を含む使用済の原料と原料
ホッパ13の新しい生石灰19を用いてスレーキングタ
ンク7で消和して消石灰スラリを得る。前記したように
SO3 を低減されたガスからはスレーキングタンク7で
得られた消石灰スラリを噴霧する蒸発反応塔15でSO
2 が本スラリにより次のように反応吸着される。本装置
により脱硫効率は70%以上が実証されている。
The reduction rate is estimated to be 80% or more as estimated from the reduction of SO 3 by fly ash in a coal-fired boiler. The SO 3 -reduced gas is slaked in the slaking tank 7 by using the used raw material containing CaSO 4 which circulates in the mesh passage 2 and adsorbs SO 3 and fresh lime 19 in the raw material hopper 13 to make slaked lime slurry. obtain. As described above, SO 3 is reduced in the evaporation reaction tower 15 which sprays the slaked lime slurry obtained in the slaking tank 7 from the SO 3 reduced gas.
2 is adsorbed by this slurry as follows. With this device, desulfurization efficiency of 70% or more has been verified.

【0024】 SO2 +Ca(OH)2 →CaSO3 +H2 O 蒸発反応塔15で噴霧された消石灰スラリ10はガスの
保有熱により水分が蒸発乾燥し、反応副生物及び未反応
固形分は乾燥ダストとして集じん機16で捕集される。
SO 2 + Ca (OH) 2 → CaSO 3 + H 2 O In the slaked lime slurry 10 sprayed in the evaporation reaction tower 15, the water is evaporated and dried by the heat of the gas, and the reaction by-products and unreacted solids are dried dust. Is collected by the dust collector 16.

【0025】集じん機16及び蒸発反応塔15のホッパ
で捕集された乾式ダスト、すなわちガス中煤塵、反応副
生物、未反応アルカリは乾式ダストとして処理される。
また未反応アルカリはリサイクルしてスレーキングにも
用いられる。
The dry dust collected by the dust collector 16 and the hopper of the evaporation reaction tower 15, that is, the soot dust in the gas, the reaction by-product, and the unreacted alkali are treated as dry dust.
Unreacted alkali is recycled and used for slaking.

【0026】[0026]

【発明の効果】ボイラ等の排ガスにおいては、ガス中に
SO3 を50ppm 以上含む場合があり、簡易脱硫として
アルカリスラリ吸収剤をガス中に噴霧しSO2 を反応吸
収しているケースでは、SO3 ミスト発生によ問題があ
ったが、本発明の脱硫方法によるSO3 の低減により下
流側でのSO3 ミスト問題が解決され、またSO3 と反
応して生成された反応副生品CaSO4 がスラリ製造に
有効に利用され、原料のコストをアップする事なくSO
3 低減が計れた。
EFFECTS OF THE INVENTION In exhaust gas from a boiler or the like, SO 3 may be contained in the gas in an amount of 50 ppm or more, and in a case where an alkaline slurry absorbent is sprayed into the gas for simple desulfurization and SO 2 is reactively absorbed, SO 2 is used. Although there was a problem due to the generation of 3 mist, the SO 3 mist problem on the downstream side was solved by the reduction of SO 3 by the desulfurization method of the present invention, and the reaction by-product CaSO 4 produced by reacting with SO 3 was generated. Is effectively used for slurry production, and SO can be used without increasing the cost of raw materials.
3 reduction was achieved.

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

【図1】本発明による脱硫方法の基本的プロセスを説明
するための機器配置図。
FIG. 1 is an equipment layout diagram for explaining a basic process of a desulfurization method according to the present invention.

【図2】本発明による脱硫方法の実施の態様を示す機器
配置図。
FIG. 2 is an equipment layout diagram showing an embodiment of a desulfurization method according to the present invention.

【符号の説明】[Explanation of symbols]

1 ガス煙道 2 網状通路 3 上部ホッパ 4 下部ホッパ 5 切出し用フィーダ 6 切換シュート 7 スレーキングタンク 8 攪拌機 9 スラリポンプ 10 スラリ(消石灰) 11 コンベヤ 12 スラリ噴霧部 13 原料(生石灰)ホッパ 14 ガス発生源 15 蒸発反応塔 16 集塵機 17 吸込ファン 18 煙突 19 生石灰 20 ダスト輸送装置 1 gas flue 2 mesh passage 3 upper hopper 4 lower hopper 5 feeder for cutting 6 switching chute 7 slaking tank 8 stirrer 9 slurry pump 10 slurry (slaked lime) 11 conveyor 12 slurry sprayer 13 raw material (quick lime) hopper 14 gas source 15 Evaporation reaction tower 16 Dust collector 17 Suction fan 18 Chimney 19 Quicklime 20 Dust transport device

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 SO3 を含有する排ガスを固形のアルカ
リ吸収材と接触させてSO3 を前記アルカリ吸収材に吸
着させたのち、反応生成物を含む前記接触後のアルカリ
吸収材を水と混合させてアルカリ吸収剤とし、前記吸着
によりSO3を低減させた後の排ガス中のSO2 を前記
アルカリ吸収剤に吸収することを特徴とするSO3 含有
排ガスの脱硫方法。
1. Exhaust gas containing SO 3 is contacted with a solid alkali absorbent to adsorb SO 3 on the alkali absorbent, and the contacted alkali absorbent containing a reaction product is mixed with water. A method for desulfurizing SO 3 -containing exhaust gas, characterized in that the alkali absorbent is used to absorb SO 2 in the exhaust gas after the SO 3 has been reduced by the adsorption.
JP6057096A 1994-03-28 1994-03-28 Desulfurization of so3-containing exhaust gas Pending JPH07256051A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6057096A JPH07256051A (en) 1994-03-28 1994-03-28 Desulfurization of so3-containing exhaust gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6057096A JPH07256051A (en) 1994-03-28 1994-03-28 Desulfurization of so3-containing exhaust gas

Publications (1)

Publication Number Publication Date
JPH07256051A true JPH07256051A (en) 1995-10-09

Family

ID=13045983

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6057096A Pending JPH07256051A (en) 1994-03-28 1994-03-28 Desulfurization of so3-containing exhaust gas

Country Status (1)

Country Link
JP (1) JPH07256051A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
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US11252990B2 (en) 2016-05-27 2022-02-22 British American Tobacco (Investments) Limited Apparatus and method for manufacturing tobacco industry products
US11540558B2 (en) 2016-05-27 2023-01-03 British American Tobacco (Investments) Limited Apparatus and method for manufacturing tobacco industry products
CN117258498A (en) * 2023-10-30 2023-12-22 河北中科朗博环保科技有限公司 Bypass flue system for corrosion prevention of flue gas purification facility of sintering machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11252990B2 (en) 2016-05-27 2022-02-22 British American Tobacco (Investments) Limited Apparatus and method for manufacturing tobacco industry products
US11540558B2 (en) 2016-05-27 2023-01-03 British American Tobacco (Investments) Limited Apparatus and method for manufacturing tobacco industry products
US12108782B2 (en) 2016-05-27 2024-10-08 British American Tobacco (Investments) Limited Apparatus and method for manufacturing tobacco industry products
CN117258498A (en) * 2023-10-30 2023-12-22 河北中科朗博环保科技有限公司 Bypass flue system for corrosion prevention of flue gas purification facility of sintering machine

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