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OALib Journal期刊
ISSN: 2333-9721
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准东高碱煤气化过程中碱金属迁移与结渣特性实验研究
, PP. 906-913
Keywords: 高碱煤,循环流化床,气化,运行特性,碱金属迁移,颗粒聚团
Abstract:
？利用循环流化床对天池木垒高碱煤进行了气化实验研究,获得了天池木垒高碱煤在循环流化床上的结渣特性及碱金属迁移规律,并对实验中出现的床内颗粒聚团现象进行了分析。结果表明,不同存在形态的碱金属在煤气化过程中的迁移规律不同,水溶钠和醋酸铵溶钠在煤气化过程中以气态形式析出,不溶钠主要存在半焦中;随着气化温度升高,底渣和煤气中钠含量增加,飞灰中钠含量减少;尾部管道温度降低过程中,煤气中钠的冷凝速率明显高于钾;天池木垒高碱煤气化过程中容易引起床内颗粒聚团,床温越高,颗粒聚团现象越明显,床温波动越大;碱金属与灰分中矿物成分及床料中sio2反应生成黏性低温共熔物是导致颗粒聚团的关键。
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