600MW超临界机组无热源冷态启动设计与成功应用

Design and Application of Cold Startup without Heat Source in a 600-MW Supercritical Unit

为解决某厂单台5号机组在无外界热源条件下的冷态启动问题,在A磨煤机入口风道设计安装微油加热空气预热系统,从而获得了磨煤机干燥热风,利用等离子体点火技术实现锅炉点火,点火初期利用压缩空气对空气预热器吹灰,利用锅炉自产蒸汽,解决机组冷态启动过程中所必需解决的空气预热器吹灰、给水热力除氧、汽轮机轴封用汽、汽泵冲转等方面的蒸汽需求,成功实现取消启动锅炉,实现单台机组的冷态启动,节省燃油,降低启动能耗,并在点火初期即投入了电除尘。该研究成果对节约火电建设投资、降低火电运营成本具有较高的参考价值。

To solve the issue of cold startup under the condition of no external heat source in a single Unit 5 of a certain power plant, the micro oil heating air preheating system is designed and installed at the inlet air duct of Coal Mill A to obtain the hot dry air for the mill. The plasma ignition technology is applied for the boiler ignition and soot blowing with the compressed air is adopted in the air preheater at the beginning of the ignition. The steam produced by the boiler itself is used to satisfy the demands of air preheater blowing, feedwater deaeration, turbine shaft sealing and steam pump switching, to realize the boiler startup closure and the cold startup being achieved in a single unit. This method can save fuel oil and reduce energy consumption during startup with electrostatic precipitation launched at the beginning of the ignition, which is valuable for saving the construction investment and reducing the operating costs in thermal power plants.