密集烤房内置式生物质供热炉体的设计与试验

  目的  为有效解决生物质成型颗粒燃料烤烟供热设备存在的热效率不高、粉尘堵塞散热管道和控温精度较差等问题。  方法  采用动态量化的热量输出、吹风降温的机械传动和先阻后集的除尘等方式，设计了一种生物质燃料内置式烤烟供热炉体设备，配套开发出烤烟控制程序并开展试验测试。  结果  该设备在烟叶烘烤过程中采用5个具有连续变速的机械档位量化燃料供给，控温精度达到±0.5℃以内；生物质燃烧后产生的降尘颗粒经粉尘挡板过滤后大部分落入沉降箱内，粉尘主要粒径集中在89~420 μm范围内；通风室内温度保持在44.5℃~50.5℃之间，可避免高温对各类功能性部件的损坏；安装该设备后密集烤房的系统热效率达到64.26%~65.42%。  结论  该炉体能够满足密集烤房箱式和挂竿装载烟叶的烘烤供热需求，研究结果为生物质颗粒燃料烤烟供热设备的设计和应用提供参考。 

Design and test of biomass furnace in intensive baking room

  Objective  This study aims to solve the problems of low thermal efficiency, dust blockage of heat dissipation pipeline and poor temperature control precision of biomass molded flue tobacco pellet fuel heating equipment.  Methods  A kind of biomass fuel built-in flue-cured tobacco heating furnace was designed based on dynamic quantized heat output, mechanical transmission of blowing and cooling, and blcok-concenrating dust removal, and the control program of flue-cured tobacco was developed and tested.  Results  The difference between the target and actual dry-bulb temperatures was controlled within the range of ±0.5℃ during the tobacco curing process by adopting five continuous gears of the helix biomass fuel-feeding device to control the quantified biomass fuel supply. During the heating stage of the tobacco curing process, the temperature in the furnace's ventilation chamber was 44.5℃-50.5℃ as the blower blew continuously. Therefore, high-temperature damage of the ignition, ash cleaning, and infrared detection devices was avoided.The statistical curve of the collected fly dust particle size after classification showed a normal distribution, and the 99% confidence interval was concentrated within 89-420 μm. After connection of the standard radiator of the bulk curing barn issued by the State Tobacco Monopoly Administration of China, the existing bulk curing barn's system thermal efficiency increased by 64.26%~65.42%.  Conclusions  The proposed furnace satisfies the heating requirements of mechanical racks and manual sticks for loading fresh tobacco into the loading chambers of the barn. The findings serve as a reference for design and application of heating equipment of biomass fuel for tobacco curing.