中国电机工程学报2012，Vol.32Issue(11)：47-53,7.
单颗粒褐煤烟气干燥过程模型研究
Modeling of Single Lignite Particle Drying Process in Flue Gas
摘要
Abstract
Lignite drying is very useful for improving lignite quality. In order to deeply understand lignite drying process in high temperature flue gas, a onedimensional spherical numerical model of a single lignite particle drying process in flue gas was proposed. In this model, lignite particle was divided into dry region and wet region by an evaporation interface. In the wet region, only heat transfer was considered. In the dry region, both heat transfer and mass transfer were involved to describe water evaporation. Crank-Nicolson scheme was adopted to describe the transport equations so that dynamic evaporation process can be correctly solved in a large time step. With the proposed model, gas temperature, moisture content and temperature distribution within the particle varying with the resident time were simulated during drying process. It is found that the maximum particle temperature during drying process is lower than the particleflue gas balance temperature. Particle diameter as well as initial flue gas temperature has an important effect on lignite particle drying process. Particle drying time, td becomes shorter as the initial flue gas temperature increases, td is also proportional to the square of particle diameter.关键词
褐煤颗粒/烟气/干燥过程/传热传质/数学模型Key words
lignite particle/flue gas/drying process/heatand mass transfer/numerical model分类
化学化工引用本文复制引用
郝正虎,吴玉新,吕俊复,张守玉,王秀军,彭定茂..单颗粒褐煤烟气干燥过程模型研究[J].中国电机工程学报,2012,32(11):47-53,7.基金项目
国家重点基础研究规划（973）项目（2012CB214900）. （）
