摘要
以煤和石英砂为原料,在自制双热源煤新型气化炉上实现了煤炭新型气化,测试了气化产物,从气化原料的高温结构相变和气化反应过程热力学分析出发,研究了煤新型气化机理。结果表明:双热源煤新型气化的产物除了富含CO的煤气外,还包括大量SiC副产品,其晶相以3C-SiC(77.99%)和6H-SiC(19.28%)为主,煤气中可燃气体浓度为86.9%～90.5%,产率5.0m3/h;气化炉内不同温区,煤气产生原理不同,0～1400℃温区,煤气主要来源于原料干燥和煤热解反应,1400～2600℃温区,煤气主要来源于多孔焦碳与SiO2(l),SiO2(g)及中间产物SiO(g)的电热还原反应,同时伴生副产品SiC;各气化反应阶段所产煤气总量为该时刻所有温区所产煤气总和。
A new coal gasification has been carried out with coal and quartz in our own double-thermalsource gasifier. The products of the new coal gasification were analyzed. Its principles were researched based on the analysis of high-temperature structural phase change of gasification matericals and thermodynamics in the course of gasification, which turned out that besides the gas rich in CO, the products included lots of by-product SiC, among which the proportion of 3C - SiC is 77.99%, 6H - SiC is 19. 28%, the concentration of the combustible gas is 86.9% -90.5%, gas flux is 5 m^3/h ; the principles of producing gas were different in different temperature zones in the gasifier, for example, gas in the temperature zone of 0 - 1 400 ℃ mainly came from the drying of the materials and the reaction of the coal pyrolysis, while gas in the temperature zone of 1 400 - 2 600 ℃ came from the electro-thermal deoxidized reaction between porous coke and SiO2（6）, SiO2（g） or semis SiO（g）. By-product SiC was produced, and the general flow of gas produced in different gasification phrases equaled to the total gas produced in both temperature zones during gasifying.
出处
《西安科技大学学报》
CAS
北大核心
2009年第3期352-357,共6页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金项目(50174046)
关键词
煤炭气化
反应机理
多热源
气化炉
碳化硅
coal gasification
reaction principle
multi-thermal-source
coal gasifier
SiC
