电站煤粉锅炉掺烧兰炭试验研究

摘要

为考察兰炭在电站煤粉锅炉上的适应性,确定兰炭在煤粉锅炉上的掺烧比例和方式,在充分掌握兰炭燃料特性基础上,在国内首次进行了配中速磨制粉系统的电站煤粉锅炉掺烧兰炭试验.试验结果表明,电站锅炉燃用兰炭具有减轻燃烧器喷口结渣、大幅降低烟气污染物生成量、对低热值煤具有较好替代作用等优势,试验锅炉可以预混掺烧方式实现安全稳定燃用33％比例的兰炭.针对兰炭的强磨损、低燃尽特性对制粉系统以及锅炉安全经济运行可能产生的不利影响,提出了“预混+防磨+燃烧调整”的燃用兰炭原则.%To study the adaptability of semi-coke in power plant boiler,determine its blending ratio and the way when burned in pulverized coal fired boilers,based on the full grasp of fuel properties of the semi-coke,the blending and combustion test of semi-coke in a pulverized coal fired boiler of power station with medium speed mill pulverizing system was carried out for the first time at home.The results showed that blending and combustion with semi-coke had the advantages of reducing slagging,significantly reducing the pollutants generated and altemative the low calorific value coal,and that the pulverized coal fired boiler could blend 33％ semi-coke stably by pre-mixing.Considering the effects of semi-coke on the milling system as well as boiler operation,the premix blending mode of utilizing the milling system output margin blending semi-coke and the burning principle of premixing coupled with anti-wearing and combustion adjustment were recommended.