A 4E analysis of a novel coupling process of syngas purification and CO2 capture, transcritical CO2 power and absorption refrigeration

Abstract

To achieve the goal of CO2 emission peak and carbon neutrality, a novel process coupling syngas purification and CO2 capture, transcritical CO2 power and absorption refrigeration is proposed. The purpose is to realize energy conservation and CO2 emission reduction by coupling medium and low-grade waste heat, electricity and cold water in the process. Based on verifying the accuracy of the model and simulation, the proposed system is studied from four aspects: energy, exergy, economy and environment (4E). The results show that the process can meet the industrial requirements of syngas purification and CO2 products. The thermal efficiency and exergy efficiency are 35.58% and 35.96% respectively. The annual total cost is 2.45 million dollars, and the annual CO2 emission reduction is 113.6 kt. By exploring the exergy destruction and cost distribution of components, the parts that need attention and improvement in the process are determined. In addition, the effects of heat transfer temperature difference and refrigeration temperature on the performance of the process are also studied. This provides a reference for the comprehensive performance analysis and application feasibility of the coupling process of syngas purification, CO2 capture and waste heat utilization.