摘要
本文对气流床煤气化炉内高温合成气和渣层的流动、换热、相变过程进行了分析,在合理简化和假设的基础上建立了描述渣层流动、热质传递和相变的渣层数理模型。通过对气化炉内气固两相流和化学反应的模拟,得到灰渣颗粒在气化炉壁面的沉积率,进而对所建立的模型应用SIMPLE算法进行了求解,获得了气化炉壁面灰渣流动、传热和相变过程的数值模拟结果。结果表明:壁面温度对渣层厚度的影响较炉膛温度要大得多;当壁面温度不变时,炉膛温度增加,固态渣层厚度减少;炉膛温度不变时,壁面温度降低,固态渣层厚度增加。
The flow and heat transfer of high temperature syngas and slag layer in entrained-flow coal gasifier were analyzed, and a model for slag flow and heat transfer on the internal wall was proposed. The deposition rate of ash particle on the wall was obtained based on the simulation of gas-solid two-phase flow and gasification reaction in an entrained-flow coal gasifier. A series of simulations of the flow, heat transfer and phase change of slag layer on the wall in the gasifier were carried out based on the proposed model with SIMPLE algorithm. The results indicated that the wall temperature has more significant effect on the solid slag layer thickness than the hearth temperature. The solid slag layer thickness decreases with the increase of hearth temperature when the wall temperature is stable. The solid slag layer thickness increases with the decrease of wall temperature when the hearth temperature is stable.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2009年第4期631-634,共4页
Journal of Engineering Thermophysics
基金
国家重点基础研究发展计划资助项目(No.2004CB217703)
关键词
气流床煤气化炉
熔渣
厚度
相变
entrained-flow coal gasifier
melted slag
thickness
phase change
