循环流化床锅炉下排气旋风分离器的研究进展

Research progress of cyclone separator with downward exhaust gas in circulating fluidized bed boiler

下排气旋风分离器常用于循环流化床锅炉中,起到气固分离及颗粒回收等作用。综述下排气旋风分离器的结构形式及工作原理,概括循环流化床锅炉运行过程中存在的烟气飞灰含碳量高、燃烧不稳定、烟气除尘要求高、对煤质适应性较差等问题,介绍对分离器的底锥斜面、导流体和排气管等几种结构的改进措施及气固分离效果。提出对下排气旋风分离器的优化改进应从结构改进组合应用、内构件的安装与使用、新型分离器的开发以及设备使用寿命的提高等几方面入手实施。

The cyclone separator with downward exhaust gas is commonly used in circulating fluidized bed boilers to perform gas-solid separation and particle recovery.This study introduced the structure and working principle of the cyclone separator with downward exhaust gas.The problems existing in the operation of the circulating fluidized bed boiler,such as high carbon content of flue gas fly ash,unstable combustion,high requirements for flue gas dust removal,and poor adaptability to coal quality were summarized.The improvement measures of several structures such as the bottom cone slope,fluid guide and exhaust pipe of the separator and the gas-solid separation effect were introduced.It is proposed that the optimization and improvement of the lower exhaust cyclone separator should be carried out from the aspects of structural improvement and combination application,installation and use of internal components,development of new separators and improvement of equipment service life.