JP2023025270A - 排ガス処理方法および排ガス処理装置 - Google Patents
排ガス処理方法および排ガス処理装置 Download PDFInfo
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Abstract
Description
該方法が、前記気液接触工程に先立ち、前記排ガスの流れの中に加湿液を噴霧して該排ガスの増湿および冷却を行う増湿冷却工程を有し、該増湿冷却工程では、該排ガスが垂直方向下向きに流れる領域内で該加湿液を垂直方向下向きに噴射することを特徴とする方法を提供し、これにより上記課題を解決するものである。
前記排ガス導入口から前記中段室に導入された排ガスが、前記複数の排ガス分散管を通って前記下段室に収容された水性吸収液の液面下に気泡として噴出した後、該水性吸収液の液面上に形成された空間に処理ガスとして分離され、さらに前記処理ガス上昇路を通って前記上段室に流入し、該上段室から前記処理ガス排出口を通って排出されるように構成された排ガス処理装置において、
前記排ガス導入口には、排ガスが下向きに流れるように垂直方向に延びる領域を有する排ガス導入ダクトが接続し、該垂直方向に延びる領域には、該排ガス導入ダクト内を下向きに流れる排ガス中に加湿液を下向きに噴射する加湿液噴霧手段が設けられたことを特徴とする装置を提供し、これにより上記課題を解決するものである。
実機規模のJBR実験装置を用いて、排ガス中に加湿液を噴霧する模擬実験を行った。通常仕様のJBR装置の排ガス導入ダクト部分を変更し、排ガスが垂直方向下向きに流れる領域を設けて、その領域の途中に加湿液噴射ノズルを2段に配置した。図8に示すように、排ガス導入ダクトの当該ノズル配置部位の断面は8500mm×2500mmの矩形であり、1段目(上側)のノズル群としては下面に噴射孔(ノズル)を有する12本のノズル管を約700mm間隔で水平かつ平行に並べて配置し、2段目(下側)のノズル群としては1段目と同じ形状の13本のノズル管を同じ間隔で水平かつ平行に並べて配置した。1段目のノズル群と2段目のノズル群とは垂直方向に約1000mm離して配置し、1段目の各ノズルと2段目の各ノズルとが水平方向に互いに交互に(千鳥に)なるように配置した。
実施例と同様に、実機規模のJBR実験装置を用いて、排ガス中に加湿液を噴霧する試験を行った。比較例では、通常仕様のJBR装置の排ガス導入ダクト部分をそのまま用いた。すなわち、排ガスが垂直方向下向きに流れる領域を設けず、排ガスが水平に流れる領域の途中に加湿液噴射ノズルを2段に配置した。図10に示すように、排ガス導入ダクトの当該ノズル配置部位の断面は実施例と同じく8500mm×2500mmの矩形であり、1段目(左側)のノズル群としては側面に噴射孔(ノズル)を有する12本のノズル管を約700mm間隔で垂直かつ平行に並べて配置し、2段目(右側)のノズル群としては1段目と同じ形状の13本のノズル管を同じ間隔で垂直かつ平行に並べて配置した。1段目のノズル群と2段目のノズル群とは水平方向に約1000mm離して配置し、1段目の各ノズルと2段目の各ノズルとが水平方向に互いに交互に(千鳥に)なるように配置した。
2 上段室(処理ガス排出室)
3 中段室(排ガス導入室)
4 下段室(反応室)
11 水性吸収液
12 排ガス導入口
13 排ガス分散管
14 噴出孔
15 酸素供給手段
16 攪拌手段
17 ジェットバブリング層
18 排ガス導入ダクト
19 加湿液噴射ノズル
20 垂直領域の底板
21 ドレンタンク
22 吸収液抜出口
23 ポンプ
24 ポンプ
25 固液分離手段
26 循環ライン
27 吸収液供給口
28 ガス抜き手段
101、201 容器
102、202 下段室(反応室)
104、204 吸収液
105、205 中段室(排ガス流入室)
106、206 排ガス分散管(気体下降管)
107、207 上段室(処理済排ガス流出室)
108、208 酸素供給手段
109、209 ジェットバブリング層
110、210 攪拌手段
111、211 排ガス導入ダクト
112、212 冷却液噴射ノズル
113、213 吸収液噴射ノズル
214 吸収液抜出管
218 液体下降管
221 固体分離手段
Claims (8)
- アルカリ剤および溶存酸素を含む水性吸収液中に硫黄酸化物を含む排ガスを導入して気液接触操作を行うことにより、該水性吸収液中でアルカリ剤と溶存酸素と硫黄酸化物との反応による反応生成物を固体として析出させる気液接触工程と、析出した固体反応生成物を含む該水性吸収液に対して固液分離操作を行うことにより、該固体反応生成物を回収する固液分離工程とを有する、排ガスから硫黄酸化物を除去し、除去した硫黄酸化物を固体反応生成物として回収する排ガス処理方法において、
該方法が、前記気液接触工程に先立ち、前記排ガスの流れの中に加湿液を噴霧して該排ガスの増湿および冷却を行う増湿冷却工程を有し、該増湿冷却工程では、該排ガスが垂直方向下向きに流れる領域内で該加湿液を下向きに噴射することを特徴とする方法。 - 前記加湿液の少なくとも一部として、析出した固体反応生成物を含む前記水性吸収液を抜き出して用い、排ガス中に噴霧された加湿液を排ガスから分離して加湿液ドレンとして回収し、回収した加湿液ドレンに対してのみ前記固液分離操作を行う請求項1に記載の方法。
- 前記加湿液を噴霧した後の排ガスの垂直方向下向きの流れを横方向に曲げ、排ガスの流れが曲がることによる遠心分離効果を利用して、排ガス中に噴霧された加湿液を該流れが曲がる位置の直下で分離回収する請求項1または2に記載の方法。
- 前記水性吸収液中のアルカリ剤は、石灰石スラリーとして供給される請求項1~3のいずれか一項に記載の方法。
- 直立する筒形容器の内部空間が上下方向に上段室、中段室および下段室の3室に仕切られ、該下段室にはアルカリ剤および溶存酸素を含む水性吸収液が収容され、該中段室の側壁には排ガスを導入するための排ガス導入口が設けられ、該中段室の床には該中段室内の空間に開口するとともに該床を貫通して該下段室に収容された水性吸収液中に先端が侵入するように垂直方向に延在する複数の排ガス分散管が設けられ、各排ガス分散管の先端付近には排ガスを該水性吸収液の液面下に噴出させるための噴出孔が設けられ、前記下段室内の底部付近には該水性吸収液中に酸素を含むガスを吹き込むための酸素供給手段が設けられ、該下段室の天井には該下段室内の空間に開口するとともに前記中段室を貫通して前記上段室内の空間に開口する処理ガス上昇路が設けられ、該上段室には処理ガスを排出するための処理ガス排出口が設けられ、
前記排ガス導入口から前記中段室に導入された排ガスが、前記複数の排ガス分散管を通って前記下段室に収容された水性吸収液の液面下に気泡として噴出した後、該水性吸収液の液面上に形成された空間に処理ガスとして分離され、さらに前記処理ガス上昇路を通って前記上段室に流入し、該上段室から前記処理ガス排出口を通って排出されるように構成された排ガス処理装置において、
前記排ガス導入口には、排ガスが下向きに流れるように垂直方向に延びる領域を有する排ガス導入ダクトが接続し、該垂直方向に延びる領域には、該排ガス導入ダクト内を下向きに流れる排ガス中に加湿液を下向きに噴霧する加湿液噴射手段が設けられたことを特徴とする装置。 - 前記加湿液噴射手段は、前記垂直に延びる領域の水平断面上に配置された複数の加湿液噴射ノズルを含む請求項5に記載の装置。
- 前記下段室は、該下段室内の水性吸収液を抜き出すための吸収液抜出口を有し、該吸収液抜出口から前記加湿液噴射手段に至る液経路が形成され、該吸収液抜出口から抜き出された水性吸収液が該液経路を通って該加湿液噴射手段から加湿液として排ガス中に噴霧されるように構成された請求項5または6に記載の装置。
- 前記排ガス導入ダクトは、前記垂直方向に延びる領域の下方において横方向に曲がった先で前記排ガス導入口に接続しており、該排ガス導入ダクトが横方向に曲がる位置の直下に加湿液ドレンを回収するドレンタンクが設けられた請求項5~7のいずれか一項に記載の装置。
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