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该文在上出料输送实验台基础上,改造出一个包含一套上出料和一套下出料的密相气力输送系统综合实验台。在此实验台上,以高压氮气作输送载气,进行了兖州烟煤的输送实验。通过改变出料方式及操作参数,对比研究了上、下出料系统输送特性的异同。研究结果表明,操作参数对上、下出料输送系统输送特性的影响具有一致性,但这种影响也存在一定差别。相同条件下,上、下出料方式输送系统中,煤粉质量流量、表观气速都随着总输送压差的增大而增大,煤粉质量流量随补充风流量增大而减小。补充风流量不变的前提下,总输送压差较低时,煤粉质量流量随着表观气速增大而增大,上、下出料方式对煤粉质量流量的影响随着表观气速变化规律不显著;总输送压差较高时,煤粉质量流量随着表观气速增大而减小,上出料输送系统煤粉质量流量明显高于下出料输送系统。随输送压差增加,固气质量比先增加明显后增加趋势减弱。上出料系统的煤粉质量流量、表观气速和固气质量比均略高于下出料系统。
Based on the experimental platform of discharging and conveying, the article reconstructs a comprehensive experimental platform of dense phase pneumatic conveying system which includes a set of discharging and a set of discharging. On this experimental stage, high-pressure nitrogen was used as the carrier gas for carrier transportation of Yanzhou bituminous coal. By changing the way of discharge and operating parameters, the similarities and differences between the conveying characteristics of the upper and lower discharge systems were compared. The results show that the influence of operating parameters on the conveying characteristics of the upper and lower discharging systems is consistent, but there are some differences between them. Under the same conditions, both the mass flow rate and the apparent gas velocity of pulverized coal increased with the increase of the total delivery pressure, and the mass flow of pulverized coal decreased with the increase of the additional air flow rate . Supplementary air flow under the premise of the same, the lower the total delivery pressure, the pulverized coal mass flow increases with the apparent air velocity increases, the impact of the upper and lower discharge mode on the mass flow of pulverized coal as the apparent When the total pressure difference is high, the mass flow of pulverized coal decreases with the increase of apparent air velocity. The pulverized coal mass flow rate of the upper discharge system is obviously higher than that of the lower discharge system. With the increase of differential pressure, the mass ratio of solid to gas increased first and then increased, then weakened. The pulverized coal mass flow, apparent air velocity and solid-gas mass ratio of the discharge system are slightly higher than that of the lower discharge system.