JP2014108383A - 硫酸製造装置向け脱硫方法及び脱硫装置 - Google Patents
硫酸製造装置向け脱硫方法及び脱硫装置 Download PDFInfo
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Abstract
【解決手段】 亜硫酸ガスを酸化して得られた三酸化硫黄ガスを硫酸水溶液に水を供給しながら吸収させて90wt%以上99wt%未満の高濃度硫酸を製造する濃硫酸生成工程を含む硫酸製造装置10から排出された、硫黄酸化物を含む排ガスの脱硫装置20であって、前記排ガスから前記硫黄酸化物を除去しつつ該硫黄酸化物から希硫酸を生成する脱硫塔25と、前記濃硫酸生成工程において前記希硫酸を前記硫酸水溶液に混ぜる希硫酸混合装置29とからなる。
【選択図】 図2
Description
図2に示すフローに従って試験装置を組み立てて、SO3ガスを吸収して濃硫酸を生成するSO3吸収塔13から排出された出口ガスを、加湿塔21と脱硫塔25とからなる希硫酸副生型の脱硫装置20に導いて連続的に脱硫する試験を行った。活性炭系触媒層25aには、活性炭粉にポリテトラフルオロエチレン分散液を混ぜて混練した後、シート状に加工すると共にその一部を更に波状に加工し、これらシート状のものと波状のものを交互に重ねたものを使用した。脱硫試験時の運転条件を下記の表1に示す。
図3に示すフローに示すように、水循環ポンプ22の吐出側ラインから抜き出した加湿塔21の循環水の供給先を脱硫塔25に代えて希硫酸混合装置29にした以外は実施例1と同じ条件で脱硫試験を実施した。その結果、脱硫率(平均値)は数十時間以降は安定し、400時間経過後でも75%前後で低下は認められなかった。
加湿塔21の循環水をヒーターで45℃前後に加温した以外は実施例2と同じ条件で脱硫試験を行った。その結果、脱硫率(平均値)は400時間経過後で84〜88%前後であった。すなわち、加湿塔21で使用する加湿用水を加温することによって、脱硫塔25での脱硫性能をより高いレベルで維持できることが分かった。
図4に示すフローに従って水移送ライン24に代表径3mmの活性炭を0.5L充填した分解槽30を設け、加湿塔21の水を分解処理してから脱硫塔25に移送するようにした。分解槽30には加湿塔21の水循環ポンプ22の吐出側ラインから1.5L/hで抜き出した水を導入すると共に下部から空気を0.5L/minの流量で吹き込んでニトロシル硫酸の分解処理を行った。これ以外は実施例1と同じ条件で脱硫試験を行った。
加湿塔21から分解槽30に導入する水に含まれるニトロシル硫酸の濃度を50mg/Lに代えて10mg/Lとし、加湿塔21の水循環ポンプ22の吐出側ラインから抜き出した水のうちの一部を分解槽30に供給して分解後に排出される5mg/hの液を脱硫塔25に添加し、抜き出した水の残りを希硫酸混合装置29に供給したこと以外は実施例4と同様にして脱硫試験を行った。
10 硫酸製造装置
11 SO2酸化塔
11a 五酸化バナジウム触媒
13 SO3吸収塔
13a 充填層
15 濃硫酸循環ポンプ
16 水供給ライン
20 脱硫装置
21 加湿塔
21a 充填層
22 水循環ポンプ
23 工水供給ライン
24 水移送ライン
25 脱硫塔
25a 活性炭系触媒層
26 スプレー管
27 希硫酸循環ポンプ
28 希硫酸移送ライン
29 希硫酸混合装置
30 分解槽
Claims (15)
- 亜硫酸ガスを酸化して得られた三酸化硫黄ガスを硫酸水溶液に水を供給しながら吸収させて90wt%以上99wt%未満の高濃度硫酸を製造する濃硫酸生成工程を含む硫酸製造装置から排出された、硫黄酸化物を含む排ガスの脱硫方法であって、
前記排ガスから前記硫黄酸化物を除去しつつ該硫黄酸化物から希硫酸を生成する脱硫工程と、前記濃硫酸生成工程において前記希硫酸を前記硫酸水溶液に混ぜる混合工程とを含む脱硫方法。 - 前記希硫酸の生成が前記排ガスを酸素の存在下で水分とともに活性炭系触媒に接触させることである、請求項1に記載の脱硫方法。
- 前記排ガスを前記活性炭系触媒に接触させる前に前記排ガスを加湿用液に接触させて加湿する加湿工程を更に含む、請求項2に記載の脱硫方法。
- 前記排ガスと接触した加湿用液の少なくとも一部を前記希硫酸とともに前記濃硫酸生成工程の前記硫酸水溶液に混ぜる、請求項3に記載の脱硫方法。
- 前記排ガスと接触した加湿用液の少なくとも一部からニトロシル硫酸を除去する除去工程を更に含み、前記ニトロシル硫酸が除去された液を前記水分として用いる、請求項3に記載の脱硫方法。
- 前記排ガスと接触した加湿用液の少なくとも一部からニトロシル硫酸を除去する除去工程を更に含み、前記ニトロシル硫酸が除去された液を前記希硫酸とともに前記濃硫酸生成工程の前記硫酸水溶液に混ぜる、請求項3に記載の脱硫方法。
- ニトロシル硫酸を除去する除去工程が、過酸化水素及びオゾンのうちの一方もしくは両方を添加する手段、又は空気を導入しながら活性炭と接触させる手段である、請求項5又は6に記載の脱硫方法。
- 前記排ガスと接触した加湿用液の少なくとも一部を加温する加温工程を更に含み、加温された液を前記加湿用液として用いる、請求項3に記載の脱硫方法。
- 亜硫酸ガスを酸化して得られた三酸化硫黄ガスを硫酸水溶液に水を供給しながら吸収させて90wt%以上99wt%未満の高濃度硫酸を製造する濃硫酸生成工程を含む硫酸製造装置から排出された、硫黄酸化物を含む排ガスの脱硫装置であって、
前記排ガスから前記硫黄酸化物を除去しつつ該硫黄酸化物から希硫酸を生成する脱硫手段と、前記希硫酸を前記硫酸水溶液に混ぜる混合手段とを含む脱硫装置。 - 前記脱硫手段は、前記排ガスを加湿用液に接触させて加湿する加湿手段と、該加湿手段で加湿された排ガスを受け入れる脱硫塔と、該脱硫塔に収容された活性炭系触媒と、前記脱硫塔に取り付けられ、前記活性炭系触媒に水分を供給する給水管とからなる、請求項9に記載の脱硫装置。
- 前記混合手段は、前記排ガスと接触した加湿用液の少なくとも一部を前記希硫酸とともに前記濃硫酸生成工程の前記硫酸水溶液に混ぜる、請求項10に記載の脱硫装置。
- 前記排ガスと接触した加湿用液の少なくとも一部からニトロシル硫酸を除去するニトロシル硫酸除去手段を更に含み、
前記ニトロシル硫酸が除去された液が前記活性炭系触媒に供給される、請求項10に記載の脱硫装置。 - 前記排ガスと接触した加湿用液の少なくとも一部を加温する加温手段を含み、加温された液が前記加湿手段により前記加湿用液として使用される、請求項10に記載の脱硫装置。
- 亜硫酸ガスを酸化して得られた三酸化硫黄ガスを硫酸水溶液に水を供給しながら吸収させて90wt%以上99wt%未満の高濃度硫酸を生成する濃硫酸生成手段と、
硫黄酸化物を含む排ガスから前記硫黄酸化物を除去して生成した希硫酸を前記濃硫酸生成手段の前記硫酸水溶液に混ぜる混合手段とを含む硫酸製造プラント。 - 前記混合手段は、前記排ガスと接触した加湿用液の少なくとも一部を前記希硫酸とともに前記濃硫酸生成手段の前記硫酸水溶液に混ぜる、請求項14に記載の硫酸製造プラント。
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