摘要
建立了液态排渣煤气化炉炉内灰渣的流动和换热的数学模型,模型以基本的流动和换热方程为基础,经过简化物理模型,得到求解渣膜厚度的方程和渣膜的换热方程。为求解方程,在前人研究成果的基础上,结合对国内煤种的试验,总结出煤灰渣粘度与相关气化温度关系的方程。利用建立的模型,采用差分法对两段式干煤粉加压气化炉进行求解,得到灰渣的流动速度和渣膜厚度,并与该炉运行试验数据进行比较,发现理论求解结果和试验结果相近,证明了该模型的正确性。文中同时分析了该模型的局限性,该模型是忽略了炉内煤气对灰渣流动和换热影响的孤立模型,将该模型与炉内煤气流动和换热模型联合可以得到更精确的炉内灰渣的流动和换热的解。
A mathematical model was developed about flow and heat transfer of slag film in an entrained flow gasifier with liquid slag-removal process. The model was based on the traditional flow and heat transfer equations. By simplifying the physics model, the equations in terms of slag film thickness and heat transfer were obtained. In order to solve the equations, based on the previous research, the equations with coal slag viscosity and syngas temperature were built and relevant experiments were carried out. The model was then used to calculate the slag film character of the two-stage dry pulverized coal entrained-flow gasifier. The equations solved by calculus of differences, the velocity and the thickness of the slag film were obtained. By comparing with experimental data of gasifier, the modeling results are proved to be valid. The limitation of this model was also discussed. The effects of syngas flow and heat transfer are not included in this model. In the future, combining with syngas flow and heat transfer, the model will be more accurate.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第14期12-17,共6页
Proceedings of the CSEE
基金
国家高技术研究发展计划项目(863计划)(2007AA05Z265)~~
关键词
气流床气化炉
渣膜
流动
换热
厚度
entrained flow gasifier
slag film
flow
heat transfer
thickness
作者简介
李小宇（1976-），男，博士研究生，从事干煤粉加压气化技术和煤气化过程中传热过程的研究，lixiaoyu@tpri.com.cn。
