塔式玉米除湿热泵连续烘干系统的模拟及应用

Simulation and application of continuous corn drying tower of dehumidified heat pump

针对东北粮食干燥多在冬季,干燥能耗大和污染严重的问题,采用闭式多级串联除湿和加热的方法,设计塔式玉米除湿热泵连续烘干系统,对玉米热泵干燥系统的性能进行理论和试验研究,结果表明:1)理论计算结果与实测结果吻合;2)与玉米燃煤干燥系统相比,本研究提出的多级蒸发除湿和多级冷凝加热的除湿热泵系统节能达到30%以上;3)传统玉米干燥系统环境新风加热后与粮食完成一次热湿交换,然后直接排到环境中,浪费能源,同时随废气排出的糠皮对周围环境也造成一定的污染,而本研究设计的热泵干燥系统采用闭式循环结构,玉米绒及尘土在回风管路被除尘装置收集,无任何污染物排放到环境大气中,同时,因为干燥温度低,送风均匀,玉米品质明显提高。

Aiming at the problems of large energy consumption and serious pollution of corn drying,a continuous corn drying system of desiccant heat pump is designed and used in low temperature environment. The results show that; 1） Multi-stage evaporating dehumidification and multi-stage condensation system can recovery the sensible heat and latent heat of the exhaust gas discharged from the drying tower. Compared with the conventional drying equipment, the heat pump drying equipment has higher efficiency, and the overall energy-saving is 30%. 2） Of the traditional design, fresh air is heated and directly discharge atmosphere after finished heat exchange with corn which causes energy waste and the environment pollution by discharging brans with exhausted air. This drying system designed in this study is a closed-cycle structure which can have energy recovery of the air that discharged from the drying tower, no dust is released into the atmosphere and its energy-saving is obvious. Because of low drying temperature and uniformity of air flow,the quality of dried corn is improved obviously.