低浓度含氧煤层气净化控制系统设计

Design of Control System for Low-Concentration Oxygenated Coal Bed Methane Purification

低浓度含氧煤层气直接含氧液化精馏制液化天然气(LNG),在充分利用低浓度煤层气的同时又避免了煤矿瓦斯气直接排放造成的大气污染。首先,分析了含氧煤层气制LNG工艺中净化工段的工艺流程,结合工艺要求设计了可靠的控制系统。然后,根据低浓度含氧煤层气净化控制的工艺要求和系统规模,构建了分布式控制系统(DCS)的总体架构。在此基础上进行了硬件系统功能的选型及配置,以及对DCS软件的组态设计。最后,实现了DCS在工程实例中的一体化应用。该系统的应用提高了生产效率和产品质量,为工艺流程的稳定运行提供了安全保障。

The direct oxygenated liquefaction and distillation of low-concentration oxygenated coal bed methane to liquefied natural gas(LNG)makes full use of the low-concentration coal bed methane while avoiding the atmospheric pollution caused by the direct emission of coal mine gas.Firstly,the process flow of the purification section in the oxygenated coal bed methane to LNG process is analyzed,and a reliable control system is designed in combination with the process requirements.Then,according to the process requirements and system scale of low-concentration oxygenated coal bed methane purification control,the overall architecture of the distributed control system(DCS)is constructed.On this basis,the selection and configuration of the hardware system functions are carried out,and the software of the DCS is configured and designed.Finally,the integrated application of DCS in the engineering example is realized.The application of this system improves the production efficiency and product quality and provides safety guarantee for the stable operation of the process.