(Department of Thermal Engineering,State Key Laboratary of Efficient and Clean Combustion of Coal,Toinghua University)

Abstract

The fractional collection efficiency of separator of CFB boiler is one of the main facts which control the performance of a circulating fluidized bed boiler. Based on cold test,a patent square separator with particle accelerating inlet was developed by Tsinghua University. Hot tests investigation were also undertook in a test rig. The measurement results prove that the fractional collection eficiency of square separator with particle accelerating inlet is almost unchanged during the diameter of separatorscaled from 300mm to 3000mm. And this efficiency issimilar as the round cyclone with corresponding diameter. The measured collection efficiency for 3000mm×3000mm was measured as: cut size dso is 42μm, dasis 160μm,while,its pressure drop is only 500Pa in industrial scale pilot.The results are valuable for scaling up design.

Keywords： square separator;fractional collection efficiency;pressure drop

DOI：10.13732/j.issn.1008-5548.1998.01.002