Pulverized Coal Particle Presence Inside CWM Droplet

CWM 방울안의 미분탄 존재

The purpose of this study is to get experimental data on the distribution of CWM (Coal- Water Mixture) droplets size and the presence of pulverized coal particles inside CWM droplets. Atomization of CWM is done by Twin-Fluid Atomizer. The operational parameters are atomizing air pressure, coal particle loading, mean size of pulverized coal particles and sampling positions across spray. Th data analysis is initiated by Impression Sampling Method(Magnesium Oxide Technique) and Photo-technique and counting works are followed. Experimental work induces following research results. The variation of particle loadings in slurry makes no appreciable effects on the mean size of CWM droplets. It is evident that atomizing air pressure has very strong effect on the atomization of slurry. The mean size of atomized fuel droplets is dramatically reduced with the increasing air pressure. The population ratio of droplets without coal particles to total number of droplets is decreased as atomizing air pressure or loading rises and the same trend is obtained as the mean size of coal particles becomes smaller but a certain tendency of coal particle presence inside droplets could not be found from the change of sampling positions.

본 연구에서는 CWM을 이류체 미립화기(twin-fluid atomizer)로 미립화 시켜 미립화에 크게 영향을 미치는 인자들로 믿어지는 공기분사압력, 부하도(loading), 미 분탄의 크기 그리고 CWM 방울 채집위치의 변화가 CWM 방울크기 분포와 CWM 방울안 미 분탄 존재유무에 미치는 영향을 연구의 목적으로 하였다.