LNG冷能用于果蔬冷冻干燥的分析

Analysis of LNG Cold Energy Used in Freeze-drying of Fruits and Vegetables

以某LNG调峰储配站(日供气量为30×10^4 m^3/d)为例,设计了一种LNG冷能用于果蔬冷冻干燥加工工艺的方案,将LNG气化过程中产生的冷能用于果蔬冷冻干燥加工。通过Aspen Plus V11模拟,计算结果表明,质量流量为9 t/h的LNG,可提供给冻干机组预冷箱组的换热量为1224 kW,提供给冻干机组真空干燥箱组的换热量为612 kW,相当于节电900 kW。项目投资回收期为1 a,经济性效益好。

Taking a LNG peak-shaving storage and distribution station(the daily gas supply is 30×10^4 m^3/d)as an example,a scheme of using LNG cold energy for freeze-drying of fruits and vegetables is designed,and the cold energy generated during the LNG vaporizing is used in the freeze drying of fruits and vegetables.Through Aspen Plus V11 simulation,the calculation results show that the LNG with a mass flow rate of 9 t/h can provide a heat exchange capacity of 1224 kW to the pre-cooling box group of the freeze-drying unit,and a heat exchange capacity of 612 kW to the vacuum drying box group of the freeze-drying unit,which is equivalent to a power saving of 900 kW.The investment recovery period of the project is 1 year,and the economic benefit is good.