Simulation Study on the Optimization of Carbon Capture System and Its Impact on Thermal System in Subcritical Coal-fired Power Plants
In order to reduce the influence of alcohol-amine carbon capture system on thermal economy of coal-fired power plants,a carbon capture system was built based on rate model through ASPEN PLUS software,and built a novel carbon capture system integrating rich liquid split process,lean vapor compression process and steam superheat utilization.The results show that when the liquid-rich split ratio is 0.1 and the flash tank pressure is 0.16 MPa,the energy consumption of the novel carbon capture system is the lowest(3.09 GJ/t(CO2)),which is 20.77％lower than that of the conventional carbon capture system.Among them,the utilization of steam superheat reduces the energy consumption of the system by 11.54％.In addition,EBSILON software was used to build the sub-critical unit thermal system coupled with the carbon capture system.The results showed that when the unit load is 127.55 MW and CO2 capture capacity is 500000 tons/year,the boiler heat load of the novel carbon capture unit decreased by 1.87％and the coal consumption for power generation decreased by 7.22 g/kWh.It can be seen that the optimization measures adopted in this study can not only reduce the reboiler duty of the carbon capture system,but also greatly improve the thermal economy of the subcritical carbon capture unit.
subcritical unitcarbon capture systemreboiler dutythermal systemsimulation study
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