两种煤成灰特性对比试验研究

来源 :中国电机工程学报 | 被引量 : 0次 | 上传用户:VIPYJS
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为分析某循环流化床锅炉纯烧一种南非煤时无法实现满负荷运行的原因,利用热重及静态燃烧结合冷态振筛的方法将该南非煤和淮北烟煤进行燃烧和成灰特性对比试验.结果表明,南非煤发热量高、着火温度低、燃尽时间短、成灰量少且易成细灰;同等粒径的2种原煤在相同的成灰条件下,南非煤成灰的平均粒径明显偏细,细灰(≤91 μm)质量份额高于40%,淮北烟煤低于20%;原煤粒径增大,南非煤成灰平均粒径变化不大;原煤粒径超过4 mm后,淮北烟煤成灰平均粒径显著增大.南非煤的成灰特性可能是此锅炉密相区超温、不能满负荷运行的原因,可从提高旋风分离器分离效率、添加辅助床料及采用飞灰回燃技术等方面着手改进.
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