氧燃烧方式下痕量元素形态转化的试验和模拟研究  

A EXPERIMENTAL AND SIMULATIVE STUDY ON THE MORPHO- LOGICAL TRANSFORMATION OF THE TRACE ELEMENT UNDER OXYGEN-COMBUSTION ATMOSPHERE

作　　者：王泉海[1] 邱建荣[1] 温存[1] 孔凡海[1] 熊全军[1] 吴辉[1] 张小平[1] 刘豪[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《工程热物理学报》2006年第z2期199-202,共4页Journal of Engineering Thermophysics

基　　金：高等学校青年教师教学科研奖励计划项目(2001);国家自然科学基金重点基金资助项目(No.90410017);国家自然科学基金项目资助(No.50525619)

摘　　要：结合热重试验及XRF测量,采用化学热平衡分析方法对煤中易挥发的有毒痕量元素砷、铬、锑和汞在不同燃烧方式下的化学形态及分布进行了研究。计算表明,在常规燃烧方式下,痕量元素在400-1800 K的温度范围内容易蒸发,生成气相单质或氧化物。富氧燃烧条件下,高浓度的CO2(g)以及碳颗粒温度的降低在一定程度上会抑制痕量元素的蒸发,同时CO2(g)也会抑制痕量元素向气相次氧化物及单质的转化。Combined with TG/DTG/DSC and XRF analyzer, an equilibrium thermodynamics method is used to study the morphological transformation and distribution of the volatile poisonous trace elements/ (As、Cr、Sb、Hg) under different atmosphere. The results show that the trace element would easily volatilize and become simple substance or oxide under N2-based combustion during 400~1800 K. While under Oxygen-combustion atmosphere, the high CO2(g) concentration and decrease of char temperature would restrain the vaporization of trace element to a certain extent, meanwhile the translation of trace element to simple substance qr suboxide would also be restrained.

关 键 词：煤 痕量元素 燃烧 化学热力学 氧燃烧 

分 类 号：X701[环境科学与工程—环境工程]