摘要
为了研究喷动流化床煤部分气化炉的气-固流动特性,采用三维欧拉多相流模型和颗粒动能理论相结合的数学模型,对一台直径100 mm的喷动流化床试验台进行了数值模拟研究.研究内容包括喷动流化床不同工况下内部射流的发展、气-固流动特性、典型工况下气体速度分布、颗粒速度分布以及由于颗粒碰撞引起的颗粒相压力分布.模拟结果表明:典型工况下,当喷动风与总风的比例为50%时,流场有利于煤气化;气体曳力和颗粒碰撞对环形区颗粒特别是靠墙区颗粒的运动影响很大.为了验证模型的合理性,采用文献中的试验工况进行计算,计算结果和文献中的测量值吻合较好.
A three-dimensional Eulefian multi-fluid model and the kinetic theory of granular flow were applied to study the gas-solid flow behavior in a spout-fluid bed coal gasifier. A small spout-fluid bed with a diameter of 100 mm was simulated. The research was done on the development of an internal jet, gas-solid flow patterns under different operating conditions and distribution of gas velocity, particle velocity, and particle phase pressure due to particle collisions under typical operating conditions. Simulation results show that when the spout wind flow is half of the total, the flow field is propitious for gasification of coal. Gas drag force and particle collision are important to particles in the annular dense region, especially near the wall. Simulation of other experimental cases was performed to illustrate the rationality of this simulation, and the simulation value was compared with the experimental one, which showed good agreement.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2007年第4期309-313,共5页
Journal of Combustion Science and Technology
基金
国家重点基础研究发展计划(973)资助项目(G1999022105352004CB217702)
关键词
喷动流化床
欧拉法
气-固两相流
颗粒动能理论
数值模拟
spout-fluid bed
Eulerian approach
gas-solid flow
kinetic theory of granular flow
numerical simulation
