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作 者:马达夫 周文台 张守玉 何翔 陶丽 MA Dafu;ZHOU Wentai;ZHANG Shouyu;HE Xiang;TAO Li(Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200240,China;School of Energy and Power Engineering,Shanghai University of Science and Technology,Shanghai 200093,China)
机构地区:[1]上海发电设备成套设计研究院有限责任公司,上海200240 [2]上海理工大学能源与动力工程学院,上海200093
出 处:《洁净煤技术》2020年第3期161-168,共8页Clean Coal Technology
基 金:国家电力投资集团课题资助项目(201805559)。
摘 要:针对某600 MW超临界W火焰锅炉前墙水冷壁出现的拉裂现象,对其进行水冷壁向火面及背火面的温度测点安装,对锅炉启动过程中及600 MW负荷工况下的典型运行工况、氧含量、煤粉细度及F挡板开度影响下不同位置的水冷壁温度及壁面热负荷特性进行分析。试验结果表明,由于折焰角的存在,烟气流程靠近前墙,高负荷下前墙壁面热负荷高于后墙,且前墙36.8 m处热负荷最高,且炉膛宽达32 m,增加了水冷壁撕裂的可能性。采用"后墙压前墙"的F挡板开度,可降低前墙水冷壁热负荷,减少水冷壁撕裂的可能性。热负荷沿着炉高下降较快,以前墙为例,在36.8、44.0、48.5 m标高位置的平均无量纲热负荷分别为0.75、0.50、0.19左右。启炉过程中,背火面与向火面壁温差逐渐变大,投入煤粉后壁面热负荷逐渐增加。虽启磨时背火面壁温有短暂超温现象,但总体壁面热负荷较低,水冷壁较安全。氧含量对炉膛整体热负荷影响不大,在满负荷工况下,尾部烟道CO浓度不大的前提下建议氧含量维持在2%;煤粉变细后壁面热负荷略有下降,建议在不考虑磨煤机出力情况下采用工况8的折向挡板开度。In view of the cracking phenomenon of front water wall of a 600 MW supercritical W-flame boiler,the thermocouples on the fireside and backfiring surface of the water wall were installed.The influence of different location of the temperature and thermal load of water wall characteristics under the influence of the typical operating conditions,the oxygen concentration,the pulverized coal fineness and F-dampers opening under the process of boiler start-up and 600 MW load conditions was investigated.The test results show that due to the existence of the the angle of flame break,the flue gas flow is close to the front wall,the thermal load on the front wall is higher than that on the back wall under high load,and the thermal load on the front wall is the highest at 36.8 m,and the furnace width is up to 32 meters,which increases the possibility of water wall tearing.The F damper scale of rear wall pressing front wall can reduce the thermal load of front wall water wall as well as the possibility of water wall tearing.The thermal load decreases rapidly along with the furnace height.For the former wall,the average dimensionless thermal load at 36.8,44.0 and 48.5 m elevation of the former wall is 0.75,0.50 and 0.19 respectively.In the process of boiler start-up,the temperature difference between the the fireside and backfiring surface gradually increases,and the thermal load on the wall gradually increases after the pulverized coal is put into operation.Although the wall temperature of backfired surface has transient overtemperature when startingmill,the overall thermal load is low and the water wall is relatively safe.Oxygen concentration has little effect on the overall thermal load in the furnace.Under the condition of full load,the oxygen content is recommended to maintain at 2%under the premise of low CO concentration in the rear region.The thermal load decreases slightly after the pulverized coal become smaller.It is suggested that the scale of the folding dampers in condition 8 should be adopted without considering
分 类 号:X511[环境科学与工程—环境工程] TK229.6[动力工程及工程热物理—动力机械及工程]
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