燃煤过程中典型痕量元素的挥发过程模拟的研究

文中首先对痕量元素的危害进行了概述,接着介绍了痕量元素在煤中的形态及分布、以及痕量元素的行为特性,然后对目前的痕量元素As的挥发过程的模型进行了介绍,As在挥发过程中主要经历三个阶段:(1)分子或原子通过熔融体向熔融体表面的传输;(2)在熔融体表面的蒸发;(3)通过焦炭孔隙向焦炭表面的传输。最后提出了该领域研究的若干方向。

Simulation of the Vaporization of Trace Element during Coal Combustion

The simulation of the vaporization of a typical trace element-As is reviewed in this paper.Firstly,there is a summary of the hazard of trace elements.Then the distribution and the mode of occurrence of trace elements is introduced.The behavior of trace elements during coal combustion is also shown in this paper.The vaporization of a typical trace element-As is mainly introduced as followed.It is composed of three consecutive steps:(1)transportation of molecules or atoms through the bulk liquid melt to the melt surface;(2)vaporization at the melt surface/interface;(3)transport of vapor through the char pores to the char surface.Finally,the promising research topics on the vaporization of trace elements are discussed.