两段节流蒸发两段压缩热泵干燥装置模拟分析

为提高干燥后期干燥速率、降低能耗,提出了两段节流蒸发两段压缩热泵干燥装置的构想。模拟分析了以R134a为热泵工质、采用卧式流化床干燥机时,蒸发器1中工质蒸发温度te1、蒸发器2中工质蒸发温度te2、冷凝温度tc、两股空气质量流量比r(q1/q2)对制热系数COPH、除湿能耗比SMER的影响规律。结果表明:r=1,tc1=75℃,te2=15℃时,te1由15℃提高到25℃,COPH值由2.40提高到2.75,SMER由1.46 kg/(kW·h)提高到1.82 kg/(kW·h);tc1=75℃,te1=25℃,te2=15℃时,r由0.5提高到3.0时,COPH值由2.44提高到2.62,SMER由1.26 kg/(kW·h)提高到1.96 kg/(kW·h);在模拟条件范围内的COPH为2.40-3.01,SMER为0.89~1.96 kg/(kW·h)。

Simulation Analysis of the Two- stage Evaporation and Two- stage Compression Heat Pump Drying System

Two - stage evaporation and two - stage compression heat pump drying system was put forward in order to improve the late rate of drying period, and reduce energy consumption. Simulation analysis the influence of the refrigerant evaporation temperature te1 of the evaporator 1, the evaporation temperature te2 of the evaporator 2, the condensing temperature tc and the mass flow rate ratio r （q1/q2） of the two air on heating coefficient COPH and SMER, when horizontal fluidized bed was chosen as drying machine and R134a as the working refrigerant. The results shows that： when r = 1, tc = 75℃, te2 = 15℃, te1 changes from 15 ℃ to 25 ℃ , the COPH of the heat pump increases from2.40 to 2.75, while SMER raises from 1.46 kg/（kW · h） to 1.82 kg/（kW · h）. While tc = 75 ℃, te1 = 25℃, te2 = 15 ℃, r increases from 0. 5 to 3.0, COPH increases from 2.44 to 2.62, and the SMER raises froml. 26kg/（ kW · h） to 1.96 kg/（ kW · h）. Within the scope of the simulation condition, COP. ranges from 2.40 to 3.01,meanwhile SMER changes from 0. 89 kg/（ kW · h） to 1. 96 kg/（ kW ·h）.