微油点火在600MW超临界W火焰炉的应用研究

微油点火在600MW超临界W火焰炉的应用研究
刘鹏远1，肖宏博2，赵兴华2，金坪学2，杜维毅3，廖永浩1
(1.华电电力科学研究院，杭州 310030；2.四川华电珙县发电有限公司，珙县 644502；3.山西鲁晋王曲发电有限责任公司，长治 047500)
The Study of Tiny-oil Ignition Application on a Down-fired Boiler of Supercritical 600MW Unit
LIU Peng-yuan1 , XIAO Hong-bo 2 , ZHAO Xing-hua 2 ,JIN Ping-xue2 ,
CHENG Zhi-hai3 ,LIAO Yong-hao1
(1.China HuaDian Electric Power Research Institute, Hangzhou 310030, China;
2.Gongxian Power Generation Co. ,Ltd. ,Gongxian 644502, China;
3. Wangqu Power Generation Co. ,Ltd., Changzhi 047500, China )

Abstract：Application of tiny-oil ignition technology on a 600MW supercritical down-fired boiler is presented and the optimization experiments were carried out based on the operation of tiny-oil burners, which includes: The optimal adjustment of vent air damper, and the adjustment of milling system dynamic separator, and the adjustment of the primary air velocity and perimeter wind as well as withdrawal of the oil gun experiment. Experiment research shows that the tiny-oil ignition systems is simple and reliable, and the pulverized coal can be ignited when cold furnace startup with large oil fired gun, and unburned carbon in fly ash can low as 26%, and the heating-up and pressure rising rates of boiler is stable. Compared with none tiny-oil ignition, the oil consumption significantly reduced during the boiler start-up process, and the effect of oil saving is obvious. The tiny-oil ignition burner as a common boiler burner has no bad effect on the boiler performance. The oil consumption decreases during start-up process after the application of tiny-oil ignition technology and remarkable economic benefits have been achieved.
Key words: Down-fired boiler; tiny-oil ignition; oil saving
摘 要：介绍了微油点火技术在600MW超临界W火焰炉上的应用情况，并进行了微油燃烧器运行方式优化试验，包括：乏气挡板优化调整、制粉系统动态分离器调整、一次风速和周界风调整以及撤油枪试验。通过试验得出，微油点火系统简单可靠，冷炉启动在大油枪伴燃的情况下煤粉可被点燃，飞灰可燃物为26%，锅炉升温升压稳定。与不采用微油点火相比，锅炉冷态启动过程油耗明显降低，节油效果明显。微油点火燃烧器作为常用燃烧器并未对锅炉性能产生不良影响。采用微油点火措施后，启动过程油耗下降，具有明显的经济效益。
关键词：W火焰锅炉；微油点火；节油率
1.        引 言
微油点火技术在燃用烟煤、褐煤锅炉上已得到广泛应用。其基本原理是将微油量油枪放置在一次风喷口内，煤粉采用浓缩技术后形成浓相煤粉，利用油枪引燃浓相煤粉，再由浓相煤粉着火燃烧放出的热量点燃更多的稀相煤粉，煤粉分级燃烧，燃烧能量逐级放大，最终实现用微油量启动锅炉的目的，节省启动用油[1~3]。珙县电厂为燃用无烟煤的W火焰炉超临界机组，由于机组需要经常性参与调峰，为减少锅炉冲管、启停及低负荷稳燃阶段的油耗，锅炉设置了微油点火燃烧器，通过微油枪助燃来实现冷态条件下的直接投粉，从而减少锅炉基建调试及启动油耗。
2.        设备概况

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