Thermodynamic Analysis on of Skid-Mounted Coal-bed Methane Liquefaction Device using Cryogenic Turbo-Expander

Cryogenic Engineering Conference 2017

材料科学;物理学

Chen, Shuangtao^1 ; Niu, Lu^1 ; Zeng, Qiang^2 ; Li, Xiaojiang^2 ; Lou, Fang^2 ; Chen, Liang^1 ; Hou, Yu^1

State Key Laboratory of Multiphase Flow in Power Engineering, Xi'An Jiaotong University, Xi'an

710049, China^1

Xinjiang Coal Research Institute, Urumqi

830091, China^2

关键词: Compressor discharge pressures;    Cooling Capacity;    Liquefaction process;    Liquefaction systems;    Nitrogen content;    Object functions;    Optimum operations;    Thermo dynamic analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012027/pdf
DOI  :  10.1088/1757-899X/278/1/012027

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Coal-bed methane (CBM) reserves are rich in Sinkiang of China, and liquefaction is a critical step for the CBM exploration and utilization. Different from other CBM gas fields in China, CBM distribution in Sinkiang is widespread but scattered, and the pressure, flow-rate and nitrogen content of CBM feed vary significantly. The skid-mounted liquefaction device is suggested as an efficient and economical way to recover methane. Turbo-expander is one of the most important parts which generates the cooling capacity for the cryogenic liquefaction system. Using turbo-expander, more cooling capacity and higher liquefied fraction can be achieved. In this study, skid-mounted CBM liquefaction processes based on Claude cycle are established. Cryogenic turbo-expander with high expansion ratio is employed to improve the efficiency of CBM liquefaction process. The unit power consumption per liquefaction mole flow-rate for CBM feed gas is used as the object function for process optimization, compressor discharge pressure, flow ratio of feed gas to turbo-expander and nitrogen friction are analyzed, and optimum operation range of the liquefaction processes are obtained.