适合富氧燃烧发电系统的空分制氧能耗分析

Energy consumption analysis of air separation units for oxygen-enriched combustion power generation system

根据富氧燃烧对氧气需求的特点,讨论比较了基于深冷低温工艺的空分制氧设备的类型及流程,探讨了适合富氧燃烧发电机组的改进空分流程与参数选择,基于空气分离的热力学原理与空分系统主要设备耗功计算方法,以300 MW燃煤富氧燃烧机组为对象,计算了不同空分流程、不同制氧纯度的空分设备能耗和厂用电率,分析结果表明:氧纯度降低时,虽然处理的空气量增大,但厂用电率可降低约2%;在常压富氧燃烧下,外压缩流程能耗低于内压缩流程,二者厂用电率相差约8%;与目前工业上采用的高纯度空分装置的实际电耗比较,厂用电率可降低约13%。

According to the special demands of oxygen for oxygen-enriched combustion, different types and processes of air separation units（ASU） were comparatively discussed to get the improved processes and parameters for oxygen-enriched combustion power generation system. Based on thermodynamic principle of air separation and calculation method of wasted work, taking a 300MW power generating group under oxygen-enriched combustion mode as example, analytic calculation of energy consumptions and auxiliary power rates of different air separation processes and oxygen purity were completed. The results show that when oxygen purity decreases, while increasing of quantity of air, auxiliary power rate reduces 2%. Under oxygenenriched combustion, energy consumption of the external compression process is lower than the internal compression process and their auxiliary power rates differ by about 8%. Comparing with the actual power consumption of USA used in industry, the auxiliary power rate reduces 13%.