Zhang Zaoxiao,Feng Xiao
(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
Abstract:Two CO2 transport schemes, i.e., supercritical-transport and subcooling-transport,are simulated by means of ASPEN PLUS 10.1,and the pipe diameter and the number of the repressurization stations are optimized based on energy and cost efficiency.The results show that subcooling-transport scheme maximizes the energy efficiency and minimizes the cost of CO2 transport system for CO2 sequestration.The permitted transport distance decreases almost linearly with the increase of pipe inlet CO2 temperature under the same pipe inlet pressure and adiabatic conditions. A comparison of CO2 transmissions in isothermal condition with that of adiabatic condition indicates that the reduced distance rises with the increase of pipe inlet CO2 temperature in the same conditions. There is a tiny difference between isothermal and adiabatic transmissions when the pipe inlet CO2 is in liquid state.
Keywords:CO2;pipeline transmission;ambient temperature;heat transfer