Scheme Design and Analysis on Light Hydrocarbon Recovery System for Town Natural Gas

The development of cryogenic separation technology promotes the progress of light hydrocarbon recovery technology. According to the character of town natural gas in Shenyang city, this paper describes the design of a natural gas light hydrocarbon recovery system. Based on this system, the paper analyzes the relation between the liquefaction rate and the condensation pressure and temperature of the light hydrocarbon, Then it gives the condensation pressure of 3.2 MPa and the condensation temperature of 208 K; According to the product specification, it confirms some basic parameters of the distillation column as the design pressure, the number of actual stages, the feed stage etc.. It also analyses the temperature distribution of the cold and hot fluid and the average logarithmic mean temperature difference (LMTD) of the heat exchangers. Finally, it uses large chemical process simulation software to simulate the light hydrocarbon recovery system, and gives the thermodynamic parameters of the key points. These provide the fundamental basis for engineering design and operation of the light hydrocarbon recovery system.