Pilot-Scale Experimental Study on Phase Diagrams of Pressurized Pneumatic Conveying with Pulverized Coal

Abstract

Pressurized pneumatic conveying plays an important role in large-scale coal gasification systems. Some of the underlying mechanisms affecting the conveying characteristics remain open issues. Phase diagrams can provide key information regarding flow characteristics by revealing the relationship between pressure drop and superficial gas velocity, which can be utilized for flow pattern identification, stability analysis, and system optimization, in an economic and feasible way. The present work experimentally investigated phase diagrams of pressurized pneumatic conveying on a pilot-scale setup, with three types of the most widely used pulverized coal in China selected as the conveyed materials. The effects of superficial gas velocity, solid-phase mass flow rate, pipeline layout, particle size, coal type, and moisture content were studied, respectively. The findings will contribute to a better understanding of the underlying mechanism of pressurized pneumatic conveying with pulverized coal, and to a better g...