Thermodynamic and economic analysis of the coal-based polygeneration system with CO2 capture

Abstract Reducing the energy and cost penalties is the critical problem of CO 2 abatement. In this paper, through analyzing the effect of system integrating charact eristic of polygeneration system on system thermo -economic performance, the interaction between economic performance and thermodynamic performance is disclosed. And based on the analysis of the components of CO 2 avoidance cost, the essence of lower cost penalty for CO 2 avoidance in the polygeneration system is revealed. Through sys tem integration, the polygeneration system ca realize the n energy couple between the chemical island and power island, and simultaneously realize the trade-off between the insta lled capital cost and the primary energy saving, which result in very low cost p enalty for CO 2 avoidance, 2.7 $/t - CO 2 , in which the reduction of energy penalty for CO 2 avoidance plays the critical role. Furthermore, through analyzing the sensitivity of the cost of CO 2 avoidance to the capital cost and fuel cost in the polygeneration system, the results show that it is more sensitive to the capital cost, and then reducing the manufacture cost of equipment is an efficient way to reduce the cost penalty of CO 2 avoidance.