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为什么湿煤封火害处大？

家庭中用煤炉时，总会有散落的煤末。一些人贪图省事，常常用湿煤末封火，这样做有两个坏处：
湿煤封火后，炉膛内温度仍然很高，水蒸气会源源不断进入烟道，烟筒壁温度较低，总有些水蒸气凝结附在烟筒内壁上。另外，煤里常混有含硫矿石，它们燃烧生成二氧化硫，溶于水得到亚硫酸，会加速烟筒的腐蚀。

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