COMBUSTION CHARACTERISTICS OF INTERACTING COAL PARTICLES OF VARIOUS SIZE AND ARRANGEMENT INSIDE VARYING OXYGEN CONCENTRATION ENVIRONMENT
The combustion characteristics of interacting pulverized coal particles in a convective flow are numerically investigated at various oxygen concentrations considering 2-dimensional particle arrangement and size difference. The numerical simulation includes detailed interaction among the inter-spaced particles, undergoing devolatilization and subsequent char burning. Several parametric studies, which include the effect of oxygen concentration and variation in geometrical arrangement and diameter of the particles on the volatile release rate along the char combustion rate, have been carried out. The results from multiple particles are compared with those from a single particle. The results show that the rate of devolatilization and char oxidation of interacting coal particles are influenced by the particle spacing (X) and more by the O2 concentration level. We showed that the particle of smaller size tended to burn faster. When all particles are of the same size, the first and last particles yielded nearly the same burning rate. The particle located between the first and last was prominently affected by the low temperature volatiles released from the neighboring particles. These accumulated volatiles reduced the surface temperature of the middle particle and, thus, its burning rate was also reduced.
Devolatilization Ozygen concentration Particle spacing Char combustion
Ki Duck KIM Ho Young KIM Chong Pyo CHO Sam S.YOON
Department of Mechanical Engineering, Korea University, 5-ga, Anam-dong, Sungbuk-gu, Seoul 136-701 Transportation Energy Research Center, Korea Institute of Energy Research, 71-2 Jang-dong, Yuseong-g
国际会议
第六届煤燃烧国际会议(The 6th International Symposium on Coal Combustion)
武汉
英文
262-273
2007-12-01（万方平台首次上网日期，不代表论文的发表时间）