Experimental study on visualization of the flow field in a louver coal concentrator

As a key part of the horizontal bias combustion (HBC) technology, the louver coal concentrator (LCC) has been developed and successfully applied to many large-scale utility boilers. To further study the effect of the flow field structure on performance of LCC, the experimental study on flow field structure was carried out using a laser sheet system, and the full-field images were obtained. The results show that the wall near the fuel-rich side is abraded by the particles which are enriched down by the blades. Thus the division plate with proper size can be put in the exit of the LCC in order to avoid the early mix of the fuel-rich and fuel-lean airflow. The different concentration in the front of the blade varies abrasion characteristics, thus the anti-abrasion of the each blade should be considered respectively in practical application. The amount of powder in fuel-lean side is changed by adjusting the space of the blades in order to improve the performance of the concentrator.