论文部分内容阅读
分析现有几种常见的超临界煤粉炉水冷壁布置型式的特点、切圆和前后墙对冲燃烧方式以及垂直管圈水冷壁关键参数的选取原则,设计开发了低质量流速垂直管圈600MW超临界煤粉锅炉。满负荷工况下,水冷壁设计质量流速为940 kg/m2·s。这一方案使用西门子公司低质量流速垂直管技术,结合垂直水冷壁结构简单、低质量流率工质具有自补偿特性的优点,取消了节流孔圈,避免了水冷壁及下集箱的复杂结构,同时消除了运行过程中孔圈结构堵塞造成管壁超温的安全隐患,在炉膛上、下水冷壁之间设置中间混合集箱,将来自下炉膛的工质进行混合,以减小由吸热不均匀和炉膛结构差异所导致的工质侧温度偏差。最后介绍了锅炉结构,并对其性能进行了预测。
This paper analyzes the characteristics of several common types of supercritical pulverized coal boiler water wall layout, the principles of heliospheric combustion of tangent and anterior and posterior walls and the selection of the key parameters of the vertical pipe wall, and designs a low-mass flow vertical tube 600MW ultra- Critical pulverized coal boiler. Under full load conditions, the waterwall design mass flow rate is 940 kg / m2 · s. This solution uses the Siemens vertical pipe technology of low mass flow rate. Combined with the simple structure of vertical water wall and the self-compensating characteristics of low-mass flow rate working fluid, the orifice ring is eliminated, which avoids the complexity of the water wall and the lower header Structure, at the same time eliminate the operation of the ring hole structure caused by the block wall temperature overheating security risks in the furnace, the lower water wall set between the middle of the mixing header, the working fluid from the lower furnace mixing to reduce from Uneven endothermic and furnace structure differences caused by the side of the temperature deviation. Finally, the boiler structure is introduced and its performance is predicted.