孔隙率分布对陶瓷过滤元件过滤特性的影响

针对整体煤气化联合循环和增压流化床燃烧联合循环中陶瓷过滤元件之间的粉尘架桥现象，依据陶瓷过滤元件过滤流动的基本模型和理论，提出变孔隙率陶瓷过滤元件的新概念，推导出为消除或减小粉尘架桥现象的孔隙率沿轴向的分布函数．结果表明：为了避免或减小陶瓷过滤元件之间的粉尘架桥现象采用变孔隙率陶瓷过滤元件是可行的；所用陶瓷过滤元件的孔隙率沿轴向分布的函数表达式为幂指数形式，并且孔隙率沿轴向是逐渐增大的；当陶瓷过滤元件管内处于层流或紊流流态时，因管道摩擦系数不同孔隙分布函数的表达式也不同．

Effects of the Distribution of Void Fraction on the Filter Flowing Characteristics of the Ceramic Filter Elements

For the dust bridge phenomenon among ceramic filter elements in integrated gasification combined cycle and pressurizd fluidized bed combustion combined cycle, based on the basic filter flowing models and theories, the new concept of the ceramic filter elements with variable fraction void vacuum is put forward. And the distribution functions for the void fraction along the axis are deducted eliminate or decrease the dust bridge phenomenon. The results show that the ceramic filter elements with variable void fraction can be suitably adopted to eliminate or decrease the dust bridge phenomenon. The distribution functions for the void fraction of the ceramic filter elements along the axis are taken as exponential, and the void fraction increases gradually along the axis. When the flow in the tube of the ceramic filter elements is laminar or turbulent, the forms of the distribution functions for the fraction void vacuum are different due to the individual the friction coefficients in the tube.