Sahar Safarian - Department of Chemical Engineering, Reservoir Engineering, Bahonar University, Kerman, Iran
Maryam Mousavi - Department of Chemical Engineering, Reservoir Engineering, Bahonar University, Kerman, Iran

This study mainly focuses on enhancing the overall efficiency of gas transmission networks. The authors developed a model with detailed characteristics of compressor and pressure reduction stations. Following this, they suggested three different systems with gas turbine including: organic rankine cycle (ORC), air bottoming cycle (ABC), and ABC along with steam injection (SI-ABC). In addition, use of turbo-expander as a good alternative to the expansion valves was also studied. Performance of proposed cycles was investigated on a real case study for natural gas transmission network. Results showed that the highest efficiency would be obtained with ORC system where n-pentane was used as the working fluid and turbo-expander was considered in pressure reduction stations Moreover, the efficiency improvement was estimated to be ۲۲% averagely in comparison with the existing network where the flow was in the span of ۵۰ up to ۹۰ MMSCMD.

Natural Gas Transmission Network, Organic Rankine Cycle, Air Bottoming Cycle, Steam Injection Air Bottoming Cycle, Turbo-Expander, Overall Efficiency