尾气净化工段硫回收率偏低原因及凋节方法？
参考答案：
原因有：
①尾气净化反应器床层温度偏低；
②尾气净化反应器催化剂失活；
③尾气中H2含量偏低；
④克劳斯工段硫转化率偏低；
⑤吸收塔气液接触效果差；
⑥吸收塔温度偏高；
⑦精贫液中H2S含量偏高；
⑧装置低负荷尾气净化反应器发生偏流。
调节方法：
①提高尾气净化应器入口温度；
②对催化剂进行预硫化或再生操作；
③提高氢气流量或降低空气/瓦斯配比；
④优化克劳斯工段操作；
⑤平衡系受塔精/半贫液入塔流量；
⑥降低尾气和贫液温度；
⑦提高再生塔蒸汽/富液配比
⑧投用过程气抽射器，建立低处理量循环。
Ann is a middle school student. She has a sister 1 a brother. They are Helen and Paul. Ann and Helen can 2 . Ann can sing and play 3 well, but Helen 4 . Helen doesn’t like playing the instruments（乐器）. She 5 chess, but she doesn’t play chess 6 Ann. Ann can’t play chess. Helen often plays with Paul, because Paul plays 7 very well. Paul can 8 play basketball well. And he is 9 the school basketball club. He often 10 other students with basketball.
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