JPH07256051A - Desulfurization of so3-containing exhaust gas - Google Patents
Desulfurization of so3-containing exhaust gasInfo
- 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
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- Treating Waste Gases (AREA)
Abstract
Description
【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
Ｏ2 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
Ｏ2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 吸
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
Ｏ3 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.
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)
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.
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) |
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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 |
-
1994
- 1994-03-28 JP JP6057096A patent/JPH07256051A/en active Pending
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| 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 |
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