化学链燃烧中空气反应器内反应过程的模拟  

Numerical Simulation of Air Reactor in Chemical Looping Combustion Process

作　　者：张晓光[1] 赵加星 

机构地区：[1]中国特种设备检测研究院,北京100013

出　　处：《锅炉技术》2014年第1期76-80,共5页Boiler Technology

摘　　要：化学链燃烧具有二氧化碳内分离和低NOx等特点,研究固体燃料的化学链燃烧将有利于实现固体燃料的高效、经济、清洁利用,具有广阔的应用前景。基于颗粒动力学和化学动力学理论,运用基于最小能量原理的气固相间作用力计算方法,结合双流体模型,对化学链燃烧中空气反应器内流动反应过程进行数值模拟,获得了反应器内流场特性以及温度场分布规律。计算结果表明:考虑颗粒团聚效应的模型能够很好地捕捉到空气反应器中颗粒呈现出的非均匀环核流动结构,模拟结果同时分析了操作速度,操作温度对反应器中反应过程的影响,氧气转换率随着操作速度的增加而降低,随着操作温度的增加,反应速率随之增大,为耦合反应器的设计优化提供了一定的依据。Chemical looping combustion （CLC） is a combustion technology with inherent C02 separation and low NOx emission, which has a promising prospect to realize highly efficient utilization of solid fuels with economical feature and low pollution. With kinetic theory of granular flow and chemical kinetics, flow behaviors of particles in the air reactor aresimulated using a gas-solid two-fluid model. The drag forces of gas-solid phases are predicted from the local structure parameters of the dense and dilute phases based on the minimization of the energy consumed. Simulation results indicate that non-uniform core-annular flow structure can be captured with the cluster-based drag coefficient model. The effect of operating velocity and temperature on reaction process is also analyzed. Higher oxygen sorption rates can be achieved by lower gas velocity and higher temperature. Fundamental knowledge of multiphase reactive fluid dynamic behavior of the gas-solid flow is essential for the optimization and operation of a coupled reactor for chemical looping combustion process.

关 键 词：空气反应器 化学链燃烧 数值模拟 

分 类 号：TK229[动力工程及工程热物理—动力机械及工程]