JP2008231278A - タール滓の処理方法およびタール滓のコークス炉装入方法 - Google Patents
タール滓の処理方法およびタール滓のコークス炉装入方法 Download PDFInfo
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Abstract
【解決手段】コークス炉の操業によって発生するコークス炉ガスからコールタールを回収し、コールタールからタール滓スラリーを分離した後、タール滓スラリーに含有されるタール滓が50質量%以上となるようにタール滓スラリーを濃縮して濃縮スラリーとし、濃縮スラリーを加熱しながら攪拌することによって濃縮スラリーに含有される低沸点成分を除去するとともに濃縮スラリーを乾燥して乾燥タール滓とし、乾燥タール滓を原料炭とともにコークス炉へ装入する。
【選択図】図1
Description
分離タールcには少量のタール滓が残留しているので、遠心分離機3(分離タール用)を用いてタール滓を濃縮し、タール滓スラリーdに混合する。分離タールc中に残留するタール滓の濃縮は、タールデカンター等を用いた沈降分離では困難であるから、遠心分離機で行なう。
タール滓分離装置2にてコールタールbから分離されたタール滓スラリーdは、遠心分離機4(タール滓スラリー用)に供給される。遠心分離機4はタール滓スラリーdからタール滓を分離するものである。この遠心分離機4で分離されるタール滓もコールタールを付随してスラリー状態になっているが、タール滓スラリーdに比べてタール滓の割合が高くなっている。したがって、このスラリーを濃縮スラリーfと記す。
濃縮スラリーfを分離した残余のコールタールe(以下、回収タールという)は、少量ではあるが残留するタール滓を分離するために、タール滓分離装置2へ供給される。
濃縮スラリーfの加熱と攪拌を行なう加熱搬送機5は特定の構成のものに限定しないが、加熱については、外面から加熱できる構造を有する密閉型の装置を用いることが好ましい。濃縮スラリーfは、加熱によって粘度が増加し、著しい固着性を呈してくる。そのため、回転翼(いわゆるプロペラ)を用いると攪拌が困難になるので、攪拌については、図2に示すようなスクリューフィーダーを用いることが好ましい。ただし、図2(a)に示すような中心軸を有するスクリューフィーダーでは、加熱された濃縮スラリーfが軸部に固着して攪拌に支障を来たす惧れがあるので、図2(b)に示すような軸なしスクリューフィーダーが一層好ましい。
濃縮スラリーfの加熱温度が100℃未満では、濃縮スラリーfが十分に乾燥せず油分が残留して粘度状になるので、加熱搬送機5の稼動に支障を来たす。しかも低沸点成分が揮発せずに残留する。一方、200℃を超えると、濃縮スラリー5が過剰に乾燥されて過熱乾燥機5内に付着して堆積するので、加熱搬送機5の稼動に支障を来たす。したがって、加熱温度は100〜200℃の範囲内が好ましい。より好ましくは150〜190℃である。
また、発明例1と同じ濃縮スラリーfを、加熱搬送機5(すなわち蒸気ジャケット付き軸なしスクリューフィーダー)に0.2ton/時間の割合で供給して加熱しながら攪拌して乾燥タール滓hを得た。蒸気ジャケットの蒸気圧は1.0MPa(180℃)とし、濃縮スラリーfの加熱攪拌を30分間行なった後で乾燥タール滓hが排出されるようにスクリューフィーダーの回転速度を設定して、搬送機能を付与した。これを発明例2とする。
一方、比較例1として、発明例1と同じ濃縮スラリーfを、そのままo−キシレンに捕集させ、さらにガスクロマトグラフにてC6以下の低沸点成分を測定した。
その結果、発明例1,2では、低沸点成分は検出されなかった。比較例1では、低沸点成分が0.045質量%検出され、比較例2では、1kgの濃縮スラリーfから低沸点成分が5mgの割合で検出された。
2 タール滓分離装置
3 遠心分離機(分離タール用)
4 遠心分離機(タール滓スラリー用)
5 加熱搬送機
6 排ガス処理設備
7 コールタール分離機
a コークス炉ガス
b コールタール
c 分離タール
d タール滓スラリー
e 回収タール
f 濃縮スラリー
g 低沸点成分
h 乾燥タール滓
i 原料炭
Claims (5)
- コークス炉の操業によって発生するコークス炉ガスからコールタールを回収し、前記コールタールからタール滓スラリーを分離した後、前記タール滓スラリーに含有されるタール滓が50質量%以上となるように前記タール滓スラリーを濃縮して濃縮スラリーとし、前記濃縮スラリーを加熱しながら攪拌することによって前記濃縮スラリーに含有される低沸点成分を除去するとともに前記濃縮スラリーを乾燥して乾燥タール滓を得ることを特徴とするタール滓の処理方法。
- 前記濃縮スラリーを100〜200℃に加熱して前記低沸点成分を除去することを特徴とする請求項1に記載のタール滓の処理方法。
- 前記濃縮スラリーを加熱しながら軸なしスクリューフィーダーを用いて攪拌することを特徴とする請求項1または2に記載のタール滓の処理方法。
- 前記コークス炉から発生するコークス炉ガスとともに前記低沸点成分を排ガス処理設備へ供給することを特徴とする請求項1、2または3に記載のタール滓の処理方法。
- 請求項1〜4のいずれかに記載のタール滓の処理方法で得られた乾燥タール滓を、原料炭とともにコークス炉へ装入することを特徴とするタール滓のコークス炉装入方法。
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