摘要
针对一实际尺寸的涡旋式分解炉,建立了煤粉与RDF共燃模型,通过数值模拟的方法研究了从不同高度入炉的煤与RDF共燃过程中的交互影响规律。研究结果表明:位于煤粉进口上方的RDF入炉燃烧后,对来自下方的未燃烬煤粉的燃烧具有一定的阻碍作用,使其燃烧速率降低了,进而使得交互作用区的温度有所降低;而位于RDF进口下方的煤粉燃烧后所产生的高温气流上升至RDF燃烧区后,则对RDF的燃烧产生了很强的促进作用,不仅使其燃烧速率提高了,而且使其燃烧路径缩短了;在燃料完全燃烧所释放的热量相等的前提下,当一部分煤粉被RDF替代后,炉内的温度梯度将变小,但平均温度会有所下降。
To explore the co-combustion mechanism and interactive influence between pulverized coal and refuse derived fuel injected into the precalciner from different height, numerical simulation was executed aiming at an actual swirl-type precalciner. The results show that the combustion of the refuse derived fuel injected into the precalciner above the coal inlet hinders the combustion of those unburned pulverized coal came from below, resulting in a lower burning rate and a lower temperature in the interaction zone. On the contrary, when the high temperature gas generated from coal combustion rises up to the combustion zone of the refuse derived fuel, the combustion of the refuse derived fuel is highly promoted with not only an increased burning rate but also a shorter burning path. Under the condition of the same total heat production from fuel, when part of pulverized coal was replaced by refuse derived fuel, temperature gradient in the precalciner will be smaller, however, the average temperature will decline.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2016年第12期4054-4059,4081,共7页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金青年科学基金项目(51502221)
关键词
分解炉
煤粉
RDF
共燃
数值模拟
precalciner
pulverized coal
refuse derived fuel
co-combustion
numerical simulation
