煤粉高压密相气力输送特性

在输送压力可达4.0MPa,固体输送流率达840kg/h的仓式泵高压气力输送试验装置上进行粉煤高压浓相气力输送试验研究.考察了流化风量、充压风量、输送总差压对煤粉输送量、固气比的影响.研究表明:随着流化风量的增大,煤粉输送量逐渐增大,固气体积比先增大然后减小;当煤粉在发料罐内被充分流化后,再加大充压风量,固气体积比逐渐减小,而煤粉输送量略有增加;输送总压差对煤粉输送量有显著影响,随着总压差的增加,煤粉输送量呈线性增加.研究结果对高压超浓相气力输送系统的设计、运行和控制具有指导作用.

Investigation on characteristics of pulverized coal dense-phase pneumatic conveying under high pressure

Experiments of dense-phase pneumatic conveying of pulverized coal with nitrogen were carried out in an experimental facility with the conveying pressure up to 4.0 MPa and the solid mass flow rate up to 840 kg/h.The influences of fluidization nitrogen flow rate,the flow rate of supplementary nitrogen(for keeping pressure in the sending vessel),and total conveying pressure drop on the solid-gas ratio and the solid mass flow rate were investigated.The test results indicate that with the increase in fluidization nitrogen flow rate,the solid mass flow increases,and the solid-gas ratio increases at first and then declines.When the fluidization of pulverized coal in the sending pressure vessel becomes intensive,the solid-gas ratio declines and the solid mass flow rate increases gradually with the increase in supplementary nitrogen flow rate.And the solid mass flow rate increases linearly with the increase in total conveying pressure drop.The experimental results provide a datebase for the design,operation and control of dense-phase pneumatic conveying system.