Influence of dense phase CO2 pipeline transportation parameters

Abstract

CO2 pipeline transportation is an important part of carbon capture, utilization and storage (CCUS) technology, and it'fs economical and effective when the phase state is the dense phase and supercritical phase during the transportation. When the fluid is in single-phase flow during the process of transportation, the energy required is minimum. As the temperature of the supercritical transportation is increased above 31.4C °, heating problem occurs in the transportation process because of the influence of the ambient temperature. In this paper, the dense phase transportation and supercritical phase transportation are compared, and the results show that the dense phase transportation has much greater advantage. On this basis, in order to determine the range of parameters for CO2 pipeline transportation in dense phase and ensure safety transportation, the relationship between transportation pressure, temperature and pipeline transportation distance under the influence of different inlet temperature, pipeline flow, total heat transfer coefficient, ambient temperature, etc. are studied using HYSYS software simulator. The results showed that the flow rate and ambient temperature have great influence on the pressure along the pipeline. In order to ensure cost-effective pipeline transportation, pipeline flow rate should not be too large, with phase transition not occurring in the 300 km pipe length in dense phase transportation. This study is a basic research of CO2 pipeline transportation in dense phase. It has a reference value for the formation of a complete CO2 pipeline transportation system in China.