Experimental study on velocity distribution of the gas-solid two phase flow in a louver coal concentrator

As a key part of the horizontal bias combustion (HBC) technology, the louver coal concentrator has been developed and successfully applied to many large-scale utility boilers. The gas-solid two phase flow was investigated using particle dynamics analyzer (PDA) to study the gas/solid separation mechanism in a louver coal concentrator. Gas-solid two phase field in typical sections, near the blade surface and fuel-rich side exit of the louver coal concentrator were obtained. The results show that the particle concentrate in the louver coal concentrator due to the collision between particles and the blade near the blade surface as well as gas-solid velocity slip between two blades. Blades concentrate particles near the blade and influence little in the zones away from blades. The erosion wall area in fuel-rich side exists between the last blade to 0.7a (″a″ is the width of the louver coal concentration) away from it and anti-erosion measures should be considered in application.