基于Aspen HYSYS的撬装化沼气液化流程研究

Study on Liquefaction Process of Skid-mounted Biogas Based on Aspen HYSYS

撬装化沼气液化系统的优化设计对于沼气的开发与利用具有重要的现实意义和较高的使用价值。在深入研究小型天然气撬装系统的流程设计和工艺设计基础上,针对沼气的特点及液化条件分析,将撬装化设计技术引入沼气液化系统的设计中,建立净化与液化耦合的沼气液化系统。在模块化设计的基础上,对沼气液化系统运行中的模块构建、模块设计进行深入的研究和探索,计算撬装化各阶段装置的性能参数。结果表明:生物质LNG液化率为0.9242,生物质LNG与压缩罐装的沼气相比,甲烷含量高、二氧化碳的含量及氮气含量低。撬装化的沼气液化系统的能耗低、液化率高、能量损失少。

The optimal design of skid mounted biogas liquefaction system has important practical significance and high application value for the development and utilization of biogas. Large and medium-sized liquefaction systems have been applied in natural gas liquefaction plants. However, due to the huge equipment, it is not convenient to develop small gas fields, coalbed methane, biogas etc. The small skid-mounted liquefaction system has the characteristics of streamlined process, small equipment size, and skid-mounted device. Based on the in-depth study of the process design and process design of small natural gas skid mounted system, the skid mounted design technology is introduced into the design of biogas liquefaction system. Based on the existing modular design, the module construction and module design in the operation of biogas liquefaction system are deeply studied and explored. The biogas liquefaction system coupled with purification and liquefaction is established, the module design of the skid mounted system is carried out, and the performance data of each skid mounted device are obtained. The results show that the liquefaction rate of biomass LNG is 0.9242. Compared with biogas in compressed tank, the biomass LNG has higher methane content, lower carbon dioxide content and nitrogen content. The biogas liquefaction system has the advantages of low energy consumption, high liquefaction rate and less energy loss.