Analysis of Pressure Drop Characteristics and Methods for Calculating Gas and Gas-Solid Flow in Horizontal Pipes for Dilute Coal Conveying System

摘要

This article reported pressure drop characteristics and methods for calculating friction factors λ 0 and λ_μ for gas and gas-solids flows, respectively, in straight horizontal pipes are summerized.The advantages and disadvantages of calculating friction factor λ_μ through dimensional analysis in comparison with model simulation are analyzed. It is pointed out that model simulation is more suitable to engineering use than dimensional analysis. According to experimental results of dilute gas-coal powder flow in straight horizontal pipes of the coal pulverization system in a power plant, an empirical formula and a theoretical formula for calculating friction factor λ_μ in straight horizontal pipes transporting dilute coal powder are obtained.