Simulation of the Influence of the Solid/gas Ratio on the Super-dense Phase Pulverized Coal Pneumatic Transmission Flow Pattern

In the light of the critical problems existing in the current dense phase pneumatic transmission numerical simulation process,presented was a mathematical model depicting the influence of the interaction inside the solid phase on the movement of the particles.The model in question was based on the discretion particle model,enabling it to simulate both sparse phase particle movement of a suspended flow and the super-dense phase gas-solid two phase flow when a build-up takes place inside tubes.By utilizing the mathematical model thus established,the high pressure super-dense phase pulverized coal pneumatic transmission particle flow process was numerically simulated and the simulated results revealed the typical flow pattern characteristics of a slug flow and sand hill flow etc.and the evolution law of their flow patterns with the solid/gas ratio.Moreover,the simulated results were verified in combination with the test.The fluctuation nature of the slug flow during a transmission process in pipelines is relatively conspicuous and the fluctuation frequency tends to be converted to a high frequency.The average slug flow length will increase with an increase of the solid/gas ratio of the feed.