Mortaza Zivdar - Corresponding Author: Chem. Eng. Dept., Faculty of Eng., University of Sistan and Baluchestan, Zahedan, Iran
Moslem Abrofarakh - PhD. Student, Chemical Engineering Department University of Sistan and Baluchestan, Zahedan, Iran

Natural gas transmission processes in the pipeline encounter many problems, such as the high cost of purchasing and maintaining compressors in pressure boosting stations, the formation of gas hydrates, the formation of two-phase fluid, noise pollution, and service and maintenance costs of the pipeline. To solve these problems, natural gas transmission in the supercritical state (dense phase state) is recommended. Unfortunately, there is limited information on the transmission of natural gas in the dense phase. In this research, the natural gas transmission of Iran’s fourth national pipeline in the supercritical state has been studied, and the results have been compared with the normal state. By performing this process in the dense phase mode, the number of pressure stations was reduced from ۱۰ stations in the normal mode to ۴ stations in the dense phase mode. The results of this study also showed that the pressure drop and energy of compressors in the dense phase state were reduced by ۵۹% and ۶۰%, respectively.

Dense Phase, Natural gas transmission, Pipelines, Simulation