高压煤粉密相气力输送水平管阻力特性

通过试验和理论计算两种方法研究高压下煤粉密相气力输送水平管稳定段的压力损失情况.理论计算是在Barth气力输送理论基础上,引用Stegmaier的附加压力损失系数的经验关系式进行的.试验发现,尽管输送气体表观速度呈下降趋势,而水平管稳定段的单位压降随固气比增大而增加.显然,较高输送系统压力下气体引起的压降虽然不能忽略,但引起水平管段压降变化的主要因素是输送的煤粉浓度.通过试验值与计算值比较,发现试验与理论计算值吻合得相当好,说明基于Barth气力输送理论的附加压降法对高压煤粉密相气力输送阻力特性的计算具有较好的适应性.

Resistance Properties for Horizontal Pipe in Dense Phase Pneumatic Conveying of Pulverized Coal Under High Pressures

This paper investigated the pressure drops for horizontal pipes in dense-phase pneumatic conveying of pulverized coal under high pressures through experiments and theoretic calculation. Based on Barth's pneumatic conveying theory, Stegmaier's empirical equation of the additional pressure drop coefficient is introduced and applied in the calculation.It is found that the unit pressure drops in the stabilized conveying section of a horizontal pipe increase despite apparent velocity of the conveying air is decreased. Distinctly, a key factor affecting the pressure drops for horizontal pipe is the concentration of conveyed pulverized coal, though the pressure drops caused by the conveying air can't be ignored under high pressures.With the comparison between the calculated results and the experimental data, it is shown that the calculated results agreed fairly well with the experimental data. This illuminated that the additional pressure drops method based on Barth's pneumatic conveying theory has a better adjustability to the prediction of the resistance characteristics for the dense phase pneumatic conveying of pulverized coal under higher pressure.