摘要
提出了一种新型高温空气煤粉多级点火燃烧器。在成功实现煤粉多级点火的基础上,对影响多级煤粉着火燃烧的各影响因素(一级煤粉浓度、热风温度、多级煤粉浓度、多级煤粉送粉风流量以及环形冷却风流量)进行了试验研究。结果表明,随着一级煤粉浓度的降低,燃烧器内总体温度水平下降,多级煤粉的剧烈燃烧区向燃烧器出口移动。当多级煤粉气流着火后,停止一级给粉,热风温度在一定范围内仍可维持多级煤粉的着火燃烧。多级点火燃烧器内部温度随多级煤粉浓度的升高呈现先上升后下降的趋势。多级煤粉送风量对多级煤粉燃烧的影响呈现出与多级煤粉浓度变化相似的趋势。少量的环形冷却风可以对多级煤粉的燃烧起到助燃以及防止结焦的作用。
A new style of multi-stage high temperature air（HTA） direct-igniting pulverized coal（PC） combustor was proposed.Base on the successful ignition,the factors’ effects on the ignition of multi-stage pulverized coal flow was studied,such as the concentration of the first stage PC flow and the multi-stage PC flow,the temperature of heating air,the flow rate of multi-stage PC flow and the flow rate of ringed cooling air.The results show that as the concentration of the first stage PC flow decreases,inner temperature level decreases in combustor and the intense combustion region moves to the combustor＇s outlet.Once the multi-stage PC flow being ignition,the first stage PC could be shut off,the HTA could sustain the multi-stage PC flow combustion.The inner temperature increases firstly and then decreases as the multistage PC concentration increases.And the same result is discovered for the flow rate of multi-stage PC flow.Minor ringed cooling air is helpful to the PC combustion and preventing coking.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第20期7-14,共8页
Proceedings of the CSEE
关键词
高温空气
多级点火
燃烧器
煤粉燃烧
high temperature air
multistage ignition
combustor
pulverized coal combustion
