不同分布形式的钙盐对燃煤三模态颗粒物生成的影响

Influence of different distributions of Ca-mineral in coal on trimodal particulate matter formation during combustion

通过物理掺混和溶液浸渍两种方式将醋酸钙添加至烟煤中,分别制得富含外在钙盐的掺钙煤与富含内在钙盐的浸钙煤,将原煤、掺钙煤和浸钙煤在沉降炉中进行燃烧实验,炉膛温度1 300℃。收集并分析燃烧生成的颗粒物,研究不同分布形式的钙盐对三模态颗粒物生成的影响。结果表明,三种煤燃烧生成的超细模态、中间模态和粗模态颗粒物均分别位于小于0.2、0.2-2.0和大于2.0μm粒径范围内;内、外在钙盐均促进超细模态颗粒物的生成,其中,外在钙盐的促进作用更明显;内在钙盐抑制中间模态颗粒物的生成,而外在钙盐促进其生成;对于粗模态颗粒物的生成,内在钙盐具有促进作用,外在钙盐作用不明显。

Calcium acetate was added into a bituminous coal through physically blending and impregnation to obtain the ble-Ca coal rich in excluded Ca-mineral and imp-Ca coal rich in included Ca-mineral,respectively.The rawcoal,ble-Ca coal and imp-Ca coal were burned in a drop tube furnace at 1 300 ℃. The generated particulate matters（ PMs） were collected and analyzed to study the influence of different distributions of Camineral in coal on trimodal PMformation during combustion. The results showed that for the three coals,PMs with the ultrafine mode,central mode and coarse mode were all in the size range of 〈0.2 μm,0.2- 2 μm and 〉2 μm,respectively. The included and excluded Ca-minerals can both promote the formation of ultrafine mode PM,and the excluded one had more significant effect. The included Ca-mineral can restrain,while the excluded one can promote the formation of central mode PM. The included Ca-mineral can promote the formation of coarse mode PM,while the excluded one did not have obvious effect.