薄板烘丝机筒内结垢程度对设备工艺性能的影响
Impact of fouling in the thin-plate cut tobacco dryer on equipment process performance
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摘要: 为揭示薄板烘丝机筒内结垢对设备工艺性能的影响,利用涂层测厚仪结合数理统计分析技术、热成像分析技术对比两台薄板烘丝机结垢严重程度、过程参数批间运行值、热风控制稳定性、料尾延迟特性、蒸汽消耗量、壁面温度分布均匀性等差异。结果表明:制丝一区和制丝二区的烘丝机壁面污垢层厚度平均值分别为1.5 mm、0.4 mm;不同结垢程度的烘丝机,批间物料流量和工艺热风流量运行值存在显著性差异;与污垢层厚度为0.4 mm的烘丝机相比,当壁面污垢厚度为1.5 mm时,烘丝机工艺热风流量和温度的波动增大,料尾延迟时间增加了30 s,蒸汽消耗量增加了65 kg/h;壁面颗粒污垢的附着与积聚,影响了筒壁温度分布均匀性,局部温度极差达8 ℃。Abstract: In order to reveal the impact of fouling formation in the thin-plate cut tobacco dryer on the equipment process performance, a thickness detector combined with mathematical statistical analysis and thermal imaging analysis techniques was employed to comparatively analyze the differences in fouling severity, batch-to-batch operational values of process parameters, stability of hot air control, material tail delay characteristics, and steam consumption between two cut tobacco dryers. The results indicated that the average thicknesses of the fouling layers on the walls of the two dryers were 1.5 mm and 0.4 mm, respectively. Dryers with varying degrees of fouling exhibited significant differences in the operational values of material flow rate and process hot air flow rate between batches. Compared to the dryer with a fouling layer thickness of 0.4 mm, when the wall fouling thickness was 1.5 mm, fluctuations in the process hot air flow and temperature of the dryer were increased, resulting in a 30 s increase in material tail delay and a 65 kg/h increase in steam consumption. The adhesion and accumulation of particulate fouling on the walls affected the uniformity of the drum wall temperature distribution, with local temperature extremes reaching 8 ℃.
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