Jaojaruek K, Kumar S
Energy Field of Study, School of Environment, Resources and Development, Asian Institute of Technology, P.O. Box 4, Klongluang, Pathumthani 12120, Thailand.
Bioresour Technol. 2009 Dec;100(23):6052-8. doi: 10.1016/j.biortech.2009.06.052. Epub 2009 Jul 23.
Models of the gasification process are mostly based on lumped analysis with distinct zones of the process treated as one entity. The study presented here was conducted to develop a more useful model specifically for the pyrolysis zone of the reactor of a downdraft gasifier based on finite computation method. Applying principles of energy and mass conservation, governing equations formed were solved by implicit finite difference method on the node of 100 throughout the length of the considered pyrolysis range (20 cm). Heat transfer considered convection, conduction, and the influence of solid radiation components. Chemical kinetics concept was also adopted to simultaneously solve the temperature profile and feedstock consumption rate on the pyrolysis zone. The convergence criteria were set at 10(-6) and simulation used Fortran Power Station 4.0. Validation experiments were also conducted resulting in maximum deviation of 24 degrees C and 0.37 kg/h for temperature and feedstock feed rate, respectively.
气化过程的模型大多基于集总分析，将过程中的不同区域视为一个整体。本文开展的研究旨在基于有限计算方法，开发一个更适用于下行式气化炉反应器热解区的模型。应用能量和质量守恒原理，通过隐式有限差分法在整个考虑的热解范围（20厘米）内的100个节点上求解所形成的控制方程。热传递考虑了对流、传导以及固体辐射成分的影响。还采用化学动力学概念来同时求解热解区的温度分布和原料消耗率。收敛准则设定为10(-6)，模拟使用Fortran Power Station 4.0。还进行了验证实验，温度和原料进料速率的最大偏差分别为24摄氏度和0.37千克/小时。
