论文部分内容阅读
近年来中国投资大型化工企业建设发展迅速,锅炉为化工装置提供动力蒸汽,其经济运行非常重要。某煤化集团年产52万吨尿素的大化集团公司,由于天然气短缺和涨价,2001年4月公司决定用煤替代天然气,筹建循环流化床锅炉,来缓解天然气供求矛盾。自锅炉建成投产以来,运行基本稳定,由于对循环流化床锅炉燃烧规律掌握不够,缺乏优化控制运行经验,曾长期出现灰中渣残炭量(渣中残炭7%~16%,灰中残炭一直在18%~28%之间)过高的现象,造成锅炉热效率下降,运行很不经济。为此通过技术人员不断努力消化吸收循环流化床锅炉燃烧技术,结合长期实际运行的工况进行分析,合理控制与调整燃烧,摸索总结操作经验,来降低灰渣中的含碳量。
In recent years, China has been investing heavily in the construction of large-scale chemical enterprises. Boilers provide steam for chemical plants and its economic operation is very important. Due to the shortage of natural gas and price hikes, a certain chemical company of Dahua Group, which produces 520,000 tons of urea a day, decided to replace natural gas with coal and build a circulating fluidized bed boiler in April 2001 to ease the contradiction between supply and demand of natural gas. Since the boiler was put into operation, the operation basically stable, due to insufficient understanding of the combustion laws of circulating fluidized bed boilers, the lack of experience in the operation of optimal control, had long-term residual ash residue ash content (7% ~ 16% residual carbon residue, ash Residual carbon has been between 18% ~ 28%) is too high, resulting in reduced boiler thermal efficiency, the operation is not economical. To this end through continuous efforts by technical staff digestion and absorption of circulating fluidized bed boiler combustion technology, combined with long-term actual operating conditions analysis, reasonable control and adjustment of combustion, to explore the operating experience to reduce the carbon content of ash.