化工学报2013，Vol.64Issue(3)：897-905,9.DOI:10.3969/j.issn.0438-1157.2013.03.016
DD分解炉燃烧与分解耦合过程的数值模拟
Numerical simulation of coupling mechanism between pulverized coal combustion and calcium carbonate decomposition in double-sprayed precalciner
摘要
Abstract
To study the coupling mechanism between combustion of pulverized coal and thermal decomposition of calcium carbonate, numerical simulation was carried out aiming at an actual double-sprayed precalciner. In Euler coordinate system gas phase was expressed with the k-ε two-equation model, in Lagrange coordinate system solid phase was expressed with the discrete phase model (DPM) , chemical reaction was expressed with the species transport model, and radiation was expressed with the P-1 radiation model. The predicted burn-off rate of pulverized coal was 86%, and the predicted decomposition rate of calcium carbonate was 92. 9%. The data were in agreement with actual measurement. The results showed that when vertical high-velocity flue gas from the kiln met horizontal tertiary air, a major upward gas stream was created, by which coal particle stream was carried toward the outlet located on the side of the precalciner. Combustion of pulverized coal occurred mainly in the center of the lower semi-cylindrical part of the precalciner, resulting in a high temperature zone, around which calcium carbonate decomposed rapidly.关键词
分解炉/煤燃烧/碳酸钙分解/耦合/数值模拟Key words
precalciner/ coal combustion/ calcium carbonate decomposition/ coupling/ numerical simulation分类
化学化工引用本文复制引用
梅书霞,谢峻林,何峰,金明芳..DD分解炉燃烧与分解耦合过程的数值模拟[J].化工学报,2013,64(3):897-905,9.基金项目
国家"十二五"科技支撑计划项目(2011BAE29B01) （2011BAE29B01）
中央高校基本科研业务费专项资金项目. （）
