LNG冷能用于气体直接接触法制取冰浆研究

Study on ice slurry production by air direct contact method on basis of utilizing LNG cold energy

阐述了LNG冷能利用的背景,分析了LNG冷能梯级利用原理,提出了用LNG代替传统制冷系统作为冷源的气体直接接触式冰浆制取改进方法。LNG冷能不同利用方式的对比计算结果表明,通过利用LNG冷量可将系统的能效系数提高到原来的3倍左右。LNG直接利用时冷量损失大于LNG梯级利用。随着LNG初始利用温度的升高,LNG冷量损失近似线性下降,而所需的LNG质量流量则呈现"J"字型增长趋势。

The background of LNG cold energy utilization was discussed and the cascade utilization principle of LNG cold energy was analyzed.Then the improved method that using LNG cold energy as cold source of ice slurry production system was proposed.Different methods of using LNG cold energy were compared and the results show that the energy efficiency coefficient of the system increases up to about 3 times of the original result by using LNG cold energy,the cold exergy loss rate of directly using of LNG cold energy is greater than cascade utilization of LNG cold energy.With the initial temperature of the used LNG rising,cold exergy loss rate of LNG approximately decreases linearly and the required mass flow rate of LNG shows J-shaped growth.