一种易挥发烃类油气混合物回收方法探讨

A DISCUSSION OF THE RECOVERY TECHNIQUE OF VOLATILE OIL-GAS MIXTURES

系统阐述了用于油气回收的三级直接冷凝法的原理和特点,在此基础上提出油气回收的三级加压冷凝法。通过数值计算分析,得出两种油气回收方法的回收效率和冷负荷特点。结果表明,三级加压冷凝法能有效减少第三级制冷负荷,提高能量利用效率。与三级直接冷凝法相比,三级加压冷凝法可将深冷温度提高约32℃,能耗降低51.87%。综合分析加压引起的温度和压力变化对爆炸下限和爆炸速率的安全性结果表明,采用三级加压冷凝法的安全性可以保证。

Principles and characteristics of the three-stage direct condensing technique for recovering oil- gas mixtures are systemically expressed, based on which a three-stage adding-pressure condensing technique is brought forward. By numerical calculation and analysis, the characteristics of recovery efficiency and cooling loads are obtained for these two condensing techniques, respectively. Results show that the adding-pressure one can effectively reduce the cooling loads of the third stage, and improve the coefficient of energy utilization. Comparing to the direct one by refrigeration circulation principle, it is found that the adding-pressure one can effectively rise the deep cooling temperature of more than 32 ℃ and reduce the energy consumption of 51.87%. A comprehensive analysis of the safety is directed on lowest explosion limit and the explosion velocity resulted from the change of temperature and pressure. Result shows that the safety is pointed out to be ensured for the three-stage adding-pressure condensing technique.