摘要
贵州某660 MW超临界W型火焰锅炉实际燃用的煤种严重偏离设计煤种,长期存在脱硝入口烟温及锅炉排烟温度偏高的问题,电厂采用掺烧烟煤方式解决该问题。通过不同比例的烟煤掺烧试验可知,随着烟煤掺配比例增加,总体灰量减少、飞灰含碳量与排烟温度下降明显,锅炉效率随之提高。对比不掺烧烟煤,烟煤掺烧比例从8.3%增加到16.7%时,锅炉热效率分别提高0.75%和1.9%,供电煤耗分别下降2.62 g/kWh和7.11 g/kWh。按年发电量60亿kWh进行核算,每年采购54.61万t、热值为20.93 MJ/kg的烟煤进行16.7%比例掺烧,年综合收益为723.2万元,进行烟煤掺烧具有较好的经济性,并且可以有效提高锅炉运行安全性和稳定性。
A 660 MW supercritical W-type flame boiler in Guizhou,which actually burns coal,deviates significantly from the designed coal type,and has long-term issues with high denitrification inlet flue gas temperature and high boiler flue gas discharge temperature.The power plant uses the method of blending pulverized coal to solve this problem.Through tests of blending coal with different proportions,it is known that as the proportion of blended pulverized coal increases,the total ash content decreases,the carbon content in fly ash and the flue gas discharge temperature drop significantly,and the boiler efficiency improves accordingly.Compared with not blending pulverized coal,when the blending ratio of pulverized coal increases from 8.3%to 16.7%,the boiler thermal efficiency increases by 0.75%and 1.9%respectively,and the coal consumption for power supply decreases by 2.62 g/kWh,and 7.11 g/kWh respectively.Based on an annual power generation of 6 billion kWh,the annual comprehensive benefit is 7.232 million yuan by purchasing 546100 tons of 20.93 MJ/kg pulverized coal for blending at a ratio of 16.7%.Blending pulverized coal has good economic benefits and can effectively improve the safety and stability of boiler operation.
作者
段天庆
程型
李坤
谭超
金顺利
张建华
DUAN Tian-qing;CHENG Xing;LI Kun;TAN Chao;JIN Shun-li;ZHANG Jian-hua
出处
《节能》
2024年第8期105-108,共4页
Energy Conservation
关键词
超临界W型火焰锅炉
烟温偏高
烟煤掺烧
炉效试验
经济性评估
supercritical W-Type flame boiler
high flue gas temperature
pulverized coal blending
furnace efficiency test
economic evaluation
