【摘要】 设计建造了一台利用余热驱动的横盘管降膜蒸发海水淡化装置,利用电加热系统,对该装置进行了稳态模拟实验研究。实验结果表明,由于采用了横盘管降膜蒸发与降膜冷凝工艺,不但使装置变得紧凑,大大减少了焊接工作量,也使系统内的传热传质过程得到极大强化。在实验条件下,单位蒸发与冷凝面积传热速率分别达到4.25kW/m2和9.70kW/m2,因而系统具有较高的产水率。对加热水流量、加热水温度、装置内压力及冷却水温度等影响产水率的因素作了测试与分析,给出了合理的取值范围。更多还原

【Abstract】 A novel one-effect desalinization unit with the horizontal coil pipe falling film evaporation powered by waste heat was developed and tested. The experimental results showed that not only the unit become more compact and the welding work amount is saved and but also the heat and mass transfer in the unit are greatly improved due to the utilization of the horizontal coil pipe falling film evaporation and condensation processes. Under the experimental conditions, the heat transfer rates in evaporation and condensation processes can reach 4.25kW/m2 and 9.70kW/m2, respectively. So, the thermal performance of the unit is greatly improved. The main factors which have influences on the freshwater yield, for example hot water flow rate, operation temperature, the vacuum degree in unit and cooling water temperature, have been investigated. The reasonable range of the factors is confirmed.更多还原