Research on Cross-Flow Filtration for Solids Removal from Coal Syncrudes. Final Report.

摘要

Tests were conducted to evaluate the applicability of cross-flow filtration for the removal of solids from solvent refined coal (SRC) filter feed. Preliminary tests were also conducted to evaluate cross-flow filtration for the removal of residual solids from solvent de-ashing overflow. A test system was designed and assembled for evaluating cross-flow filtration elements (sintered stainless steel tubes) at velocities of 10-24ft/sec,filtration pressures of 5-60psi,and temperatures of 400-500exp 0 F. The performance characteristics of the elements were determined by measuring the solids separation efficiency and the filtrate flux as a function of time and operating conditions. Tests with the SRC filter feed (5W percent ash) indicated that cross-flow filters can provide excellent solids removal (less than 0.05W percent ash in the filtrate),but the flux levels for all of the elements evaluated were too low ((0.28 gfh (2.6lb/h. ft exp 2 )) and declined too rapidly to make cross-flow filtration an economically viable process. Various techniques were evaluated for restoring the flux but were only partially effective. The preliminary tests with solvent de-ashing over-flow (0.25W percent ash) demonstrated that cross-flow filtration can produce a high quality filtrate (less than 0.05W percent ash) at flux levels substantially greater than those measured for the SRC filter feed. (ERA citation 03:044061)