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电力大数据:2018,21(5):-
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300MW燃煤锅炉低氮燃烧器改造研究
黄俊杰
(广州恒运企业集团股份有限公司 广州 510730)
Study on Modefication of Low-NOx Combustor for A 300MW Coal-fired Boiler
HUANG Junjie
(Guangzhou Hengyun Enterprises and Corporation LTD.)
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投稿时间:2018-03-18    修订日期:2018-03-20
中文摘要: 由于新环保标准《火电厂大气污染物排放标准》(GB13223-2011)的公布,国家对环保要求越来越严格,为更好地达到环保要求以及进一步降低脱硝运行成本,经过调研及针对电厂目前燃煤情况,对某电厂300MW燃煤锅炉进行了低氮燃烧器改造的必要性与可行性的研究分析,决定采用某锅炉厂新研发的多维深度分级燃烧系统,并实施了低氮燃烧器技术改造。 为了考察新型低氮燃烧系统改造后的运行状态,以及为电厂日常运行寻找最佳工况,依据国家以及行业相关标准进行多维深度分级燃烧系统(多维深度分级)的调试,进行制粉系统试验和燃烧优化调整试验,通过一系列的磨煤机出力特性试验、磨煤机分离器挡板特性试验、煤粉细度调整试验,还有习惯工况下变氧量试验、变高位燃尽风量试验、变高位燃尽风摆角试验、变氧试验、磨煤机投运组合试验、变低位燃尽风量试验、变夹心风量试验、二次风配风方式试验、负荷特性试验、空预器漏风测试等一系列试验,优化低氮燃烧器的燃烧调整,寻找较优运行工况,优化锅炉燃烧状况,更好地实现脱硝反应器前入口烟气中NOx含量低于300mg/Nm3的排放要求,延长昂贵的SCR反应器中金属催化剂的寿命,进一步降低SCR脱硝装置的运行成本,实现节能降耗,令锅炉燃烧更加地稳定、可靠与经济,防止出现水冷壁严重结焦和大屏严重挂焦问题,提高锅炉效率,达到了改造目标。
Abstract:As the new national environmental standards "Thermal Power Plant Air Pollutant Emission Standards" (GB13223-2011) published, which has increasingly stringent environmental requirements, in order to meet environmental requirements better and further reduce the denitration operation cost, based on a series of research, and for the currently coal cases, the necessity and feasibility analysis on modefication of low-NOx combustor for a 300MW coal-fired boiler of a power plant were studied. Finally, the newly developed multi-dimensional depth staged combustion system of a boiler plant was adopted. In order to examine the operation state of low nitrogen combustion system after modification and find out find the best working condition for the daily operation of power plant, according to national and industrial standards related, multi-dimensional depth grading combustion system (MDSS) was debugged, and pulverizing system test and combustion optimization adjustment test were carried on. Through a series of mill output characteristics test, mill separator baffles characteristic test, coal fineness adjustment test, as well as variable oxygen volume test on customary conditions, variable high over fired air volume test, variable angles of high over fired air damper test, variable oxygen volume test, mill commissioning combination test, variable low over fired air volume test, variable sandwich air volume test, the secondary air distribution test, load characteristics test, air preheater leakage test and so on, low nitrogen combustion burner adjustments were optimized, optimum operating conditions were found out, and boiler combustion was optimized in order to meet the emission requirements that NOx content in flue gas is lower than 300mg / Nm3 before denitration reactor inlet better, and prolong the life of expensive metal catalyst in SCR reaction to further reduce operating costs of SCR denitration devices, achieving energy saving, to make the boiler combusting more stable, reliable and economic, to prevent problems of serious water wall coking and hung coke on full screen superheater, to improve boiler efficiency and achieve modificating objectives.
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