Optimal design of CCLC coupled SCO₂ Brayton cycle process based on molecular dynamics and steady-state simulation

Key Words:CHEMICAL LOOPING COMBUSTION; PYROLYSIS; COAL; MODEL

Abstract:In China, coal-fired power generation still dominates the electricity supply. However, the extensive use of coal has increased environmental and sustainable development issues. Therefore, a novel process of coal chemical looping combustion (CCLC) coupled supercritical CO2 (SCO2) Brayton cycle system is designed through molecular dynamics (MD) simulation and process simulation in this paper. Firstly, the reaction kinetics of the CCLC process are investigated using MD simulation, obtaining the activation energy of the reactions of fuel reactor (FR) and air reactor (AR) as 57.58 kJ/mol and 34.26 kJ/mol, respectively. Subsequently, the proposed CCLC coupled Brayton cycle system is designed based on the results of MD simulation. Finally, the key parameters are analyzed based on the cycle efficiency to realize process optimization. The cycle efficiency of the novel process proposed can reach 80.19 %, which is of great significance in reducing CO2 emissions and improving energy conversion efficiency.

Volume:209

Issue:

Translation or Not:no