热泵辅助无规填料表面蒸发装置浓缩热敏料液性能研究

Study on the performance of heat pump assisted random filler surface evaporation device for concentrated thermosensitive feed liquid

目的:设计一种低能耗、可在常压下低温浓缩热敏料液的表面蒸发浓缩装置。方法:建立装置的基本方程,分析体积蒸发通量和节能倍率随料液流量、料液温度、吹扫气流量、吹扫气温度的变化规律,制作试验台并通过试验得出一组最佳性能参数。结果:当料液流量为0.02 kg/s时,装置具有最高的节能倍率和较高的体积蒸发通量;当料液温度从30℃增加到50℃时,体积蒸发通量增加了224.68%,但节能倍率降低了12.42%;当吹扫气流量从0.004 kg/s增加到0.006 kg/s时,体积蒸发通量增加了23.45%,但节能倍率降低了7.74%;当吹扫气温度从10℃增加到30℃时,体积蒸发通量减少了22.92%,但节能倍率升高了37.49%;以糖度为15°Brix的橙汁进行测试,当料液温度为38℃、吹扫气温度为26℃时,装置的体积蒸发通量可达219 kg/(m 3·h),节能倍率可达3.3。结论:热泵辅助无规填料表面蒸发装置浓缩热敏料液时具有常压下低温浓缩、能耗低等特点。

Objective:A surface evaporation concentration device were designed to concentrate thermosensitive feed liquid at low temperature under normal pressure with low energy consumption.Methods:Based on an introduction to the working principle of the device,the basic equations of the device were given.The changes of volumetric evaporation flux and energy saving ratio with flow rate of the feed liquid,feed liquid temperature,sweeping gas flow rate,sweeping gas temperature were calculated and analyzed.Designed an experimental platform and obtained a set of optimal performance parameters through experiments.Results:The results showed that when the flow rate of the feed liquid was 0.02 kg/s,the device had the highest energy saving ratio and higher volumetric evaporation flux;When the temperature of the feed liquid increased from 30℃to 50℃,the volumetric evaporation flux increased by 224.68%,but the energy saving ratio decreased by 12.42%;When the sweeping gas flow rate increased from 0.004 kg/s to 0.006 kg/s,the volumetric evaporation flux increased by 23.45%,but the energy saving ratio decreased by 7.74%;When the temperature of the sweeping gas increased from 10℃to 30℃,the volumetric evaporation flux decreased by 22.92%,but the energy saving ratio increased by 37.49%;An experimental device was established to test orange juice with a sugar content of 15°Brix,the results showed that when the feed liquid temperature was 38℃and the sweeping gas temperature was 26℃,the volumetric evaporation flux of the device could reach 219 kg/(m 3·h),and the energy saving ratio could reach 3.3.Conclusion:The heat pump assisted random filler surface evaporation device has the characteristics of low temperature concentration under atmospheric pressure and low energy consumption when concentrating thermosensitive feed liquid.