CAJ | 학술논문

流化床技术在热转化生物质方面具有优势，但生物质流化床锅炉在运行中，经常遇到床料结渣问题。该文用流化床实验装置燃烧麦秸，发现床料发生了严重的团聚结渣，床层流化状态明显恶化。随着运行时间延长，床料颗粒表面富集越来越多的钾。分析表明，渣块中的融化物组成可以用K2O-CaO—SiO2三元系简化，三元系相图可解释融化出现的原因。由于生物质灰熔点低，燃烧的半焦表面变黏，黏结床料颗粒产生结渣。通过与细灰碰撞，床料颗粒表面形成一层均匀的灰层并融化，当灰层足够厚时，黏性力让床料颗粒通过有限的点黏结在一起，形成结渣。
류화상기술재열전화생물질방면구유우세，단생물질류화상과로재운행중，경상우도상료결사문제。해문용류화상실험장치연소맥갈，발현상료발생료엄중적단취결사，상층류화상태명현악화。수착운행시간연장，상료과립표면부집월래월다적갑。분석표명，사괴중적융화물조성가이용K2O-CaO—SiO2삼원계간화，삼원계상도가해석융화출현적원인。유우생물질회용점저，연소적반초표면변점，점결상료과립산생결사。통과여세회팽당，상료과립표면형성일층균균적회층병융화，당회층족구후시，점성력양상료과립통과유한적점점결재일기，형성결사。
The fluidized bed technology has advantges at thermal conversion of biomass, though agglomeration of bed particles is a main technical problem during operation of biomass fluidized bed boiler. Wheat straw was burning in a fludized bed experimental device, and severe bed aggelomeration emerged with deterioratied fludization state. As the combustion continued, bed particles caught more and more potassium. Analysis shows that the composition of melt agglomerate can be simplified by the ternary system K2O-CaO-SiO2, and the melting behavior can be explained by the phase diagram. Because of low melting point of straw ash, surfaces of burning char become sticky at high temperatures, and the char bonds with bed particles forming agglomerates. Melting ash coats homogeneously bed particles through collisions between bed particles and fine ash. When the coats are thick enough, adhesive force makes bed particles bond together on limited points.