Estimation of Ash Recirculation Effect upon Ash Collector Efficiency by the Example of a TsBR-150U-1280 Multicyclone Collector

摘要

Problems of the mathematical estimation of the amount of recirculating ash and its effect upon the efficiency of gas treating within ash collectors with the scroll and semiscroll gas supply, which are equipped by a gas and ash recirculation system, are considered. Based on the analysis of various publications and operational experience, a conclusion is drawn regarding the complex and substantial effect of the recirculation system upon the ash collector efficiency. The following research tasks are posed: computational determination of ash weight at the ash collector inlet subject to its recirculation, development of measures for enhancement of the ash collector, and estimation of these measures. A computation procedure for consumption of recirculating ash in the ash collector and its sections with the use of formulas of the geometrical progression is represented. Based on the represented procedure as applied to a TsBR-150U-1280 multicyclone collector collecting ash of coal of an Irsha-Borodinsk coalfield, corresponding ash consumptions are determined, including that at which the effective operation of the ash collector is provided. Various variants of the modernization of the mentioned multicyclone collector are developed and estimated. Conclusions are drawn regarding the necessity for further investigations for improvement of the represented procedure, in particular, the effect of the gas speed (boiler load) upon the efficiency of various ash collector units, recirculating ash consumption, and clogging their cyclone units.