为解决利用热泵对消防水带干燥时后期干燥速率慢、能耗高的问题,提出采用热泵+微波联合干燥的方式。设计和搭建热泵微波联合干燥实验台,设计分别以热泵初始送风温度、热泵干燥时间以及微波功率为自变量的单因素实验,以此确定各因素的影响范围,在单因素实验基础上以SMER、MER、ηen为指标,采用Box-Behnken中心组合实验设计并进行响应面优化分析。结果表明,热泵微波联合干燥消防水带优化工艺参数为：初始送风温度42.3 ℃、热泵干燥时间43.45 min、微波功率1.25 kW。在此条件下得到SMER为0.658 kg/kWh,MER为1.232 kg/h,微波能量利用率为63.7%。实验验证结果与模型预测值相近,相对误差均小于4%,表明优化结果可靠。
Abstract
In order to solve the problem of slow drying rate and high energy consumption when the fire hose is dried by heat pump, the combined drying method of heat pump and microwave is put forward. A heat pump microwave combined drying experimental platform was designed and built, and a single factor experiment was designed with the initial air supply temperature of the heat pump, the drying time of the heat pump and the microwave power as independent variables, so as to determine the influence range of each factor. On the basis of the single factor experiment, SMER, MER and ηen microwave energy utilization rate were taken as indicators. The Box-Behnken center combination experiment was designed and the response surface optimization analysis was carried out. The results show that the optimum process parameters of the combined heat pump microwave drying fire hose are as follows： initial air supply temperature is 42.3 ℃, heat pump drying time is 43.45 minutes and microwave power is 1.25 kW. Under these conditions, SMER is 0.658 kg/kWh, MER is 1.232 kg/h, and ηen is 63.7%. The experimental results are close to the predicted values of the model, and the relative errors are less than 4%, indicating that the optimization results are reliable.
关键词
联合干燥 /
热泵 /
微波 /
消防水带 /
响应面法 /
单位能耗除湿量
Key words
combined drying /
heat pump /
microwave /
fire hose /
response surface method /
specific moisture extraction rate
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