NOx emission in a pulverized coal furnace was studied using numerical simulations to obtain information on mechanisms that take place in systems involving combustion of mixtures of coal and natural gas. Simulations were made for three different volatile matters content in the coal, and for rebuming with different percentage of natural gas. As the volatile matter percentage increased, the flame front became closer to the burner. The conditions for obtaining attached and detached flames could be indicated. This phenomenon could be explained by the heat-up time for the particles. When the volatile percentage was low, it took a short time for devolatilization, then it took some time for the particle to heat-up and bum. When the volatile percentage was high, the particle was already heated-up and started to bum during the devolatilization. There was also a significant effect of adding small amounts of natural gas to the coal combustion, by lowering the NOx emission by 60-85%. The reduction was in agreement with other experimental results. Original is an abstract.
|Number of pages||1|
|State||Published - 1 Dec 2002|
|Event||29th International Symposium on Combustion - Sapporo, Japan|
Duration: 21 Jul 2002 → 26 Jul 2002
|Conference||29th International Symposium on Combustion|
|Period||21/07/02 → 26/07/02|