Abstract: Abstract: Dense phase pneumatic conveying of pulverized coal is one of the critical technologies for the entrained flow coal gasification process. Based on the measurement of pressure drop in dense phase pneumatic conveying of pulverized coal for the vertical pipeline in the lab scale plant（pipe diameter 20, 50 mm）and pilot scale plant (pipe diameter 42 mm), a simple model for pressure drop prediction was established with a reasonable error within ±20%, which can provide effective reference for the design and operation of the conveying system. The pressure drop of solid phase gravity reaches about 35%-70% in the total pressure drop indicating the feature of high solid concentration in the pipeline, which shows an approximate linear relation with Froude number of solid phase if the pipeline diameter is determined. The online mass flow rate of pulverized coal for industrial facility can be evaluated through the pressure drop model when both Froude number and pipeline diameter are determined.