不同出料方式的流化罐发送料特性实验研究

The Conveying Characteristics of Blow Tank Discharge in Different Types

摘要: 为研究不同出料方式流化罐发送粉料的特性，构建了流态化喷吹粉料的气力输送实验平台，通过实验系统考察了流化罐罐压、稳压气量与底部流化气量之比对喷粉量和固气比的影响，以及上出料和下出料两种不同出料方式的发送料特性。结果表明，喷粉量随着流化罐罐压的增加而增加，固气比则先急剧增加而后逐渐趋于平缓。在流化罐内压力一定的情况下，喷粉量和固气比均随着顶部稳压气量与底部流化气量比例的增大先增大后减小，在顶部稳压气量:底部流化气量 = 2:8时达到最大；在罐内压力相同的情况下，上出料的喷粉量比下出料的高，发送相同质量的粉料下出料所用的时间比上出料约多三分之一；通过计算出料管的局部阻力及阻力系数发现，上出料管的附加压力损失及其局部阻力系数小于下出料管的附加压力损失及其局部阻力系数。

Abstract: To research the conveying characteristics of different discharge types of blow tank, a comprehensive dense phase pneumatic conveying system including a lateral discharge and a bottom discharge blow tank was developed to simulate the transportation of blasting fluidized powder. Conveying characteristics of discharge types under different conditions were investigated, and the influence of fluidized tank pressure and pressurizing gas/fluidizing gas ratio on the solid mass flow rate and solid/gas mass ratio was investigated. Results indicate that the solid mass flow rate and solid/gas mass ratio increases with the raising of the pressure of blow tank. As the pressure of blow tank raises, solid mass flow rate increases and the solid/gas mass ratio starts with a sharp increase and then slowly increases. Under constant pressure of blow tank, solid mass flow rate and solid/gas mass ratio firstly increases and then decreases, to be maximized when pressurizing gas/fluidizing gas ratio is 2:8. At the same pressure of blow tank, the solid mass flow rate for the lateral discharge is larger than the bottom discharge. The bottom discharge type uses one third more time than the lateral discharge type for transporting the same quality solid. By calculating the local resistance and resistance coefficient of the elbow near the outlet of blow tank, we found that the resistance and the resistance coefficient for the bottom are bigger than the lateral discharge conveying systems.