饲料气力输送系统设计与试验

Design and test of feed pneumatic conveying system

为了解决现代规模化生猪养殖场饲料输送过程中饲料输送能力差、输送距离短、破碎率高以及疫病防控等问题,笔者以满足年出栏万头猪的饲料供给能力为目标,设计了饲料气力输送系统及试验装置,即选用了额定压力为100 kPa、流量为12.5 m^(3)/min和功率为37 kW的罗茨风机,排量为0.01 m^(3)/r的旋转供料器,管径为83 mm的DN80镀锌钢管输送管道,筒体直径(Φ)为500 mm的旋风分离器,以及袋滤式除尘器,并对试验装置的饲料输送能力、管道压降、破碎率等输送性能进行验证。结果表明:试验装置输送能力的相对误差小于8.33%,输送能力的提高随系统管道压降的增加近似呈线性关系,饲料平均破碎率为11.50%;试验装置在工作过程中无管道粘料及弯管堵塞现象,各部件均工作正常,系统运行稳定可靠,性能指标满足设计要求。说明本试验设计猪饲料的气力输送系统可满足现代规模化生猪养殖。

In order to solve the problems of poor feeding capacity,short feeding distance,high breakage rate as well as epidemic prevention and control in the feeding process of modern large-scale pig farms,in this paper,the feed pneumatic conveying system and test device were designed by author to meet the feed supply capacity of ten thousand pigs per year.Therefore,roots blower with rated pressure of 100 kPa,flow rate of 12.5 m^(3)/min and power of 37 kW,rotary feeder with displacement of 0.01 m^(3)/r,DN80 galvanized steel pipe with a pipe diameter of 83 mm for transporting pipes,cyclone separator with cylinder diameter of 500 mm and bag filter dust collectors were selected.The feed conveying capacity,pressure drop in pipes,and breakage rate of the test device were tested.The results showed that the relative error of the conveying capacity of the experimental device was less than 8.33%.With increasing of system pressure drop,the conveying capacity basically increased linearly.In the meanwhile,the average breakage rate of feed was 11.50%.There was no pipe sticking or elbow blockage during the working process.All the parts work normally,the system runs stably and reliably,also the performance indexes meet the design requirements.The research results indicated that the pneumatic conveying of pig feed designed in this experiment could meet the requirements of modern large-scale pig breeding.