W型火焰锅炉炉内燃烧过程检测实验研究  

Experimental Investigation of the Combustion Process Detection in a W-shaped Furnace

作　　者：方庆艳[1] 姚斌[1] 江瑞宝[1] 周怀春[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《热能动力工程》2005年第4期361-364,共4页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(50176056)

摘　　要：设计了一套用于大型燃煤锅炉炉内测温、烟气分析及颗粒取样研究的设备,它包括水冷枪抽气热电偶、飞灰等速取样仪和烟气多功能测量分析仪。利用它对某电厂300MW的W型火焰锅炉沿炉膛高度进行了测温、烟气分析及颗粒采样综合测试试验,并测量了颗粒样品含碳量和粒径分布。结果表明:炉内温度和煤粉细度都是影响煤粉燃尽率的重要因素,当锅炉负荷大于260MW时则煤粉细度成为主导因素;该炉磨煤机出力裕度不大,煤质变差时高负荷下煤粉急剧变粗,机械不完全损失和化学不完全损失都增加,是燃尽率低的主要原因。研究结果为掌握该炉燃烧特性和进行相关技术调整提供了有意义的参考信息。A whole set of equipment was designed for conducting temperature measurements, flue gas analysis, and particulate sampling research, etc in a large-sized coal-fired boiler. It comprises water-cooled gun suction thermocouples, fly-ash constant speed sampling device and flue gas multi-function measurement analyzer. With the help of the above devices comprehensive measurements and tests were conducted on a 300 MW W-shaped boiler, including temperature measurements, etc along with the measurement of the carbon content and particulate diameter distribution of the sampled particulates. The results of the measurements and tests indicate that in-furnace temperature and pulverized coal fineness are major factors having a great impact on the burn-out rate of the pulverized coal. When the boiler load exceeds 260 MW, the pulverized coal fineness will become a predominant factor. Because of the insufficient reserve margin of the coal pulverizer capacity, in case of low coal quality, the pulverized coal fineness will drastically deteriorate under a higher boiler load, resulting in an increase in mechanical and chemical incomplete combustion losses. The latter is the main cause of a low burn-out rate. The authors' study results may offer significant reference data and information for understanding the combustion characteristics of the above type of boilers and conducting relevant technical adjustments.

关 键 词：W型火焰锅炉 水冷枪抽气热电偶 烟气分析 燃尽率 温度 粒度 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]