热解进料用水平气力输送进料率的调控

摘要

A new pneumatic conveying test device for pyrolytic feeding is designed.In order to determine the regulation method of the feeding rate of the device,with Larch saw dust as conveyed materials,the effect of pulse time,duty cycle of solenoid valve and the nozzle's location on the feeding rate and the feeding weiqht is tested on an independently designed and erected test bench,with the test result showing that by increasing the closing time of the single-cycle solenoid valve,the scope of the linear feeding area can be increased and the conveying weiqht and feeding rate linearity can be adjusted;with the increase in the duty cycle,the feeding weiqht increases rapidly firstly and then increases steadily,while the feeding rate decrease rapidly firstly and then decreases steadily.Pulse pneumatic conveying is conducive to increasing the feeding weiqht per second while the solenoid valve is opened.Also,the feeding rate and feeding weiqht can be controlled by adjusting the centerline distance between the nozzle and the center.%设计了一台用于热解进料的新型水平气力输送试验装置.为确定该装置进料率的调控方法,以落叶松锯末颗粒为例,在自主设计的试验台上检验了电磁阀脉冲时间、占空比、喷嘴位置对颗粒进料率、输送量的影响.结果表明:通过增加单周期电磁阀关闭时间的方式,可以增大线性进料区范围,使输送量和进料率线性可调;随占空比的增加,输送量先快速增加后趋于稳定;进料率先快速降低后趋于稳定.脉冲式气力输送有利于在不增加气耗的条件下提高电磁阀打开时单位时间的输送量,通过改变喷嘴和料斗中心线的间距可以调节输送量和进料率.