LNG冷能利用与低温空气分离的集成

Integration of cryogenic air separation process with LNG cold energy utilization

提出了一种利用LNG冷能的三塔空分流程,应用该新空分流程可以在生产高纯度液氧、液氮产品的同时,为富氧燃烧装置提供大量低功耗的高压氧气。对空分流程进行了模拟和性能分析,结果表明:新空分流程利用LNG冷能不仅生产液氧、液氮产品的功耗较常规空分装置降低了50%,而且高压氧气的生产功耗也比常规空分装置低17.5%;同时可以使空分流程的LNG冷能利用量是全液体产品空分流程的3.5倍,大幅提高了LNG接收站的冷能利用率,而且LNG冷能利用的效率可达到62.5%。此外,对影响新空分流程功耗的主要参数进行了分析。

To improving cold energy utilization of liquefied natural gas（ LNG） in LNG receiving terminal and reducing the energy cost of air separation products,an air separation process using LNG cold energy with a triple column cycle is proposed,which produces not only the high purity liquid oxygen（ O_2） and nitrogen,but also the high pressure gaseous O2 for oxy-fuel combustion device. Aspen Plus software simulation has been created to evaluate the performance of the performance of the proposed air separation proless.The results show that compared with the LNG cold energy utilization,the specific consumption for liquid products and high pressure oxygen of the proposed air separation process are 50% and 17. 5% lower,respectively,than that of the conventional one due to the LNG cold enery utilization. Meanwhile,the regasified LNG in the proposed air separation process is 3. 5 times of that of the full liquid-product air separation process with LNG cold energy utilization,and the exergy efficiency of LNG cold energy reaches 62. 5%. In addition,the effects of some key parameters on the power consumption of the proposed air separation process have been analyzed.