The Research On A Granular Layer Filter With Conical Filter Units In Fluidized-bed

The problems of energy and environment have brought forward imperative desire for clean coal technologies with high efficiency and low pollution emission. Advanced Clean Coal Technologies such as Integrated Gasification Combined Cycle (IGCC) and Pressurized Fluidized Bed Combustion (PFBC) are expected to be a primary choice for the electrical power generation industry over the next decade because of the generation efficiency and environment protection attraction. The advanced coal-fired power conversion systems(IGCC,PFBC) require reliable and efficient gas-stream-cleanup devices that can remove fine particulate and gaseous pollutants from high temperature and high pressure gas streams.A series of research have been made on a Fluidized Bed with particle layer filter,fluidizing feature,system resistance feature and filtration had been analyzed and discussed on this paper. The structure optimal research on the filter system had also been done,which lay a solid foundation for its investigation and further commercial application. This thesis give a development status quo of the energy,environment and the clean coal technologies,analyze the requirements for pollutants clean-up in the coal-fired power conversion systems, introduce the developing ceramic and granular filters.The experiments about uniformity of granular cake on lab-scale are introduced in detail. The fluidizing feature of fluidized-bed with conical filtration units is researched on the rebuilt test-bed. An empirical expression of minimum fluidizing velocity is obtained on the basis of experiments.Pressure feature of the rebuilt filtration device is researched through experiments. Setting up a pressure drop model for conical porous filtration medium and a pressure drop model on the ideally conditions.The filtration characteristics of this filter are researched. By analyzing the types of forces acting on a sphere particle in contact with the cake, a cake maintenance model is constituted. The collision force acted by other particles is the sake of that the periodical cleaning by a backpulse of compressed gas is no longer needed for this filtration device.