摘要
为了适应规模日益增大的炼厂和其他化工装置的需求,更好地回收和利用大型煤制气装置所副产的高压燃料气在减压时的能量,通过对2 000万t/a炼油配套煤制气装置中低温甲醇洗单元的减压系统进行成本分析,发现通过设置膨胀机减压可以最有效回收能量,优于其他减压措施;并对应用于大型化煤制气装置时,从流程匹配、稳定性和可靠性、控制系统、投资及消耗等方面对膨胀机的串联、并联、串并联等设置方式进行对比,得出单系列一级膨胀难以适用于大气量、高膨胀比工况,多系列一级膨胀由于出口温度过低通常会导致介质中的CO_2结冰,单系列或多系列多级膨胀需结合实际情况进行选择;同时,对膨胀机控制系统进一步探讨,为同类装置对膨胀机的应用提供了参考。
In order to adapt to the increasing requirement for refinery and other chemical plants, and to better recycle the energy and utilize high pressure fuel gas decompression by-product from coal to syngas plant, the cost of decompression system of rectisol in a 2 000 million t/a coal to syngas plant was systematically analyzed. It was found that setting expander would be the most effective strategy for recycling energy. Study also made a comprehensive comparison on cascade, parallel or cascade-parallel setting modes by adjusting process configura- tion, stability and reliability, control system, investment and cost, etc. The results show that one-train one-stage setting mode is difficult to be applied for large volume, high expansion ratio case, and multi-trains one-stage setting mode usually fails because of CO2 freezing at the outlet with an excessive low temperature. As well, one-train multi-stages or multi-trains multi-stages setting mode would be pragmatic, but the ultimate selection should take the actual situations into consideration. In addition, this study also discusses the expander control sys- tems to provide a reference for expander application of similar plants.
作者
刘文
LIU Wen(Sinopec Ningbo Engineering Co. ,Ltd. ,Ningbo 315103 ,China)
出处
《洁净煤技术》
CAS
2018年第3期123-129,133,共8页
Clean Coal Technology
