二氧化碳输送过程的优化

针对以超临界和液体方式输送C02的问题，考虑环境温度变化对C02输送管道设计的影响，采用ASPEN PLUS10．1软件对输送管道直径和加压站数目进行了定量分析和优化设计．结果表明，采用液体输送方式可以降低系统能耗和成本．在绝热和相同入口压力条件下，一次加压后的许用距离随着管道C02入口温度的升高近似线性减小．在同等条件下，管道等温输送比绝热输送减少的输送距离随管道C02入口温度的升高而增大，但C02在入口为液态时的输送距离差别则很小．

Optimization of COTransmission Processes

Two CO_2 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 CO_2 transport system for CO_2 sequestration. The permitted transport distance decreases almost linearly with the increase of pipe inlet CO_2 temperature under the same pipe inlet pressure and adiabatic conditions. A comparison of CO_2 transmissions in isothermal condition with that of adiabatic condition indicates that the reduced distance rises with the increase of pipe inlet CO_2 temperature in the same conditions. There is a tiny difference between isothermal and adiabatic transmissions when the pipe inlet CO_2 is in liquid state.