According to the structure characteristics of vertical tube platen, combined with the commissioning and trial operation experiences of the first ultra supercritical boiler in China, the factors contributing to the abnormal temperature on water wall tubes were analyzed.

The low mass flow-speed vertical tube platen features natural circulation characteristics, guaranteeing a safe operation of boilers while simultaneously meeting comparatively low mass flow-speed requirements.

Based on the research results of experts,sets out from momentum,and analyses the momentum change of liquid and solids,and puts forward calculation models of settling slurry velocity distribution and friction loss in vertical pipeline.

Heat transfer for the liquid with low boiling-point in the vertical tube;

Study on spiral flow in vertical pipe using the particle image velocimetry

Taking the object of transporting carbon black,analyzed the transportation pressure losing of level pipe、vertical pipe and bend pipe of the pneumatic transportation pipe line,gained the pres-sure losing formula of the three sorts of pipe line.

Hydraulic hoist of solid coarse particles in the vertical pipe is used in oil extraction, chemical engineering, ocean mining, coal mining and silt cleanup and so on.