Improvement of cyclone grit arrestor performance by partial gas transportation of collected hopper solids through sidestream baghouse
As a result of the 1990 Environmental Protection Act, a coal burning customer may be faced with a statutory duty to comply with emission standards perhaps five times more stringent than before. It is hoped that good cyclone systems can limit emissions from most coal burning appliances to the standard now demanded for boilers up to 50 MW (nett thermal input). The purpose of this study is to investigate particularly the multicell cyclone system, since this type of arrestor is physically most appropriate to larger boilers. One method for enhancing the performance of all types of cyclones is flue gas blowdown, where a small percentage of the throughput flue gas is extracted from the cyclone, most frequently from the dust hopper but sometimes from the vortex outlet tube. This technique has been explored, both for its absolute improvement of performance, and also to find whether it might overcome the problem of hopper cross-talk suffered by multicell designs. A practical application of blowdown, retrofitted at an industrial coal customer site, is described. As a further tool for investigating multicell cyclone design and performance, a mechanistic computer model, termed CYCINT, has been derived specifically for axial entry cyclone cells.
Bibliographic Reference: EUR 14269 EN (1992) 77 pp., MF, ECU 4, blow-up copy ECU 13.50
Record Number: 199310060 / Last updated on: 1994-11-29
Original language: en
Available languages: en