600MW低质量流速垂直管圈超临界煤粉锅炉设计开发

Development of the Design of a 600 MW Low Mass Flow Speed Supercritical Pulverized Coal-fired Boiler With a Vertical Tube Coil

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。

Analyzed were commonly seen specific features of several water wall arrangement modes of supercritical pulverized coal-fired boilers,tangentially and wall opposed combustion modes and principles for choosing the key parameters of a vertical tube coil water wall and designed and developed was a low mass flow speed vertical tube coil 600 MW supercritical pulverized coal-fired boiler. Under the full load operating condition,the design mass flow speed of the water wall was 940 kg / m2 s. The version under discussion adopted the low mass flow speed vertical tube technology developed by the Siemens Company. In combination with such merits as simple in the structure of vertical water walls and the self-compensated characteristics of the working medium at a low mass flow speed,the throttle orifice was removed,thus avoiding the complex structure of both water walls and lower headers,and at the same time,eliminating the safety hazard as the tube walls have exceeded the allowable temperature,created by any clogging in the structure of the throttle orifice during operation. An intermediate mixing header was provided between the upper and lower water wall in the furnace to mix with the working medium coming from the lower part of the furnace and minimizing the temperature deviation at the working medium side caused by non-uniform heat absorption and difference in the structure of the furnace. Finally,the authors described the structure of the boiler under discussion and predicted its performance.