000 MW机组启停节油技术研究

系统分析了1 000 MW超超临界、一级大旁路系统机组启停过程中油耗偏高的原因。通过降低单支油枪出力及减少油枪投入数量、降低启动疏水系统汽水热量损失、优化机组旁路运行方式、缩短暖机和并网至最低不投油稳燃负荷时间、冷态循环清洗过程中提高锅炉上水温度、停机时提前控制煤仓煤位等措施,降低机组启停油耗;提出了通过临炉加热和微油点火改造,可进一步降低机组启动油耗。

Study on Oil-Saving Technology in Startup and Shutdown of 1 000-MW Units

In this paper, the high fuel oil consumption during the startup and shutdown processes of 1 000-MW ultra-supercritical units with single bypass system is analyzed in details. Several measures to lower the oil consumption are proposed, such as reducing the output of single oil gun and the number of oil guns, minimizing the heat losses of steam and water in the startup drainage system, optimizing the operation mode of unit bypass system, shortening the warm-up time and the time from synchronization to the minimum oil-free stable-combustion loading, increasing the boiler water temperature in the process of cold recycling cleaning and adjusting the coal level of the coal bunker in advance when the unit is shut down. Additionally, it is recommended that by heating up the starting boiler with neighboring boiler and implementing tiny-oil ignition system the oil consumption can be reduced even further during unit startup.