CAJ | 학술논문

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。
이용순배류화상대천지목루고감매진행료기화실험연구，획득료천지목루고감매재순배류화상상적결사특성급감금속천이규률，병대실험중출현적상내과립취단현상진행료분석。결과표명，불동존재형태적감금속재매기화과정중적천이규률불동，수용납화작산안용납재매기화과정중이기태형식석출，불용납주요존재반초중；수착기화온도승고，저사화매기중납함량증가，비회중납함량감소；미부관도온도강저과정중，매기중납적냉응속솔명현고우갑；천지목루고감매기화과정중용역인기상내과립취단，상온월고，과립취단현상월명현，상온파동월대；감금속여회분중광물성분급상료중SiO2반응생성점성저온공용물시도치과립취단적관건。
The Tianchi Mulei high-alkali coal gasification in a circulating fluidized bed ( CFB) was conducted to study the operating characteristic and the migration of alkali metals, and the phenomenon of bed particles agglomeration was examined by some analytical technologies. The results show that the water-soluble and ammonium-acetate-soluble Na is released into gas while the insoluble Na is mainly remained in semi-char, indicating that the transformation of alkali is different for different modes of occurrence. At higher gasification temperature, both of Na existed in slag and gas become more, while the Na in fly ash declines. The condensation rate of Na in gas phase is higher than that of K with the decreasing of down stream temperature. It seems that the degree of agglomeration increases with the increase of temperature, resulting in bed temperature fluctuation. The eutectic with strong viscosity, formed by a direct reaction between alkali and mineral component of ash or SiO2 of bed material, is considered as the key factor leading to the agglomeration of particles.