600MW超临界锅炉微油点火试验研究

对某600 MW超临界锅炉采用微油点火技术在冷炉启动过程中,炉内燃烧状况、汽温、汽压变化、受热面壁温变化等进行了试验研究。试验结果表明:微油点火燃烧器在煤粉浓度很大的变化范围(0.2～0.6 kg煤/kg空气)内均可使煤粉稳定充分地燃烧,飞灰含碳量小于30%,飞灰中挥发分含量小于5%。锅炉受热面没有超温现象,水冷壁整体膨胀均匀,机组升温、升压速率在规程允许范围内,燃烧器壁温始终保持在300℃以下。微油点火改造取得的经济效益显著。

Experimental Investigation on 600 MW Supercritical Boiler with of Oil-saving Ignition Technology

Experimental studies were carried out on a 600 MW supercritical boiler that was ignited by the technology of oil-saving ignition.The combustion status,variation of steam temperature and pressure,and wall temperature of heat exchange surfaces were investigated.Test results demonstrated that the pulverized coal is able to be combusted fully and stably in the oil-saving ignition combustor,at a wide range of pulverized coal concentration from 0.2 to 0.6 kg/kg,and the wall temperature of the combustor remains less than 300 ℃.It was also shown that the wall temperature of heat exchange surfaces is also not overheated,which expands uniformly,and the rising rate of the steam temperature satisfies the requirement of operation rules.In addition,compared to the cases using conventional ignition techniques,the economical benefit by employing the technology of oil-saving ignition is pronounced.