Use of Laboratory Drag Measurements in Evaluating Hot-Gas Filtration of Char from the Transport Gasifier at the Pwer Systems Development Facility.

Dahlin, R. S. ; Landham, E. C.

Technical Information Center Oak Ridge Tennessee

关键词: Hot gas cleanup;    Filters;    Chars;    Coal gasification;    Power systems;   

RP-ID  :  DE2005835858

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The initial objective of this study was to better understand the reasons for the substantial increase in filter DP that was observed after the gasifier recycle loop modifications. Beyond this specific objective, a secondary goal was to develop a meaningful method of evaluating the effect of particle size and other particle properties on dustcake drag and filter DP. As mentioned earlier, the effect of particle size on dustcake drag and filter DP can be a very important consideration in the selection and specification of a precleaner cyclone for use upstream of the hot-gas filter. Installing a cyclone ahead of a hot-gas filter will reduce the transient areal loading of dust to the filter, but the beneficial effect of the reduced areal loading may be offset by an increase in drag associated with a finer particle-size distribution. The overall goal of this study was to better understand these tradeoffs and to ultimately develop a procedure that would be useful in analyzing the performance of hot-gas filters and in sizing new hot-gas filters. In addition to the obvious effects of a cyclone on dust loading and particle size, other indirect effects on particulate properties and flow resistance may occur when the cyclone is incorporated into the gasifier recycle loop as was the case at the PSDF. To better understand the importance of these other effects, this study sought to separate the particle-size effect from these other effects by measuring the drag of size-fractionated char samples collected before and after the recycle loop modifications.