Energy Consumption Analysis Of Ammonia-based CO₂Removing System From Flue Gas Of Coal Fired Power Plant And Its Integration With Power Plant

In the21’st century, global warming has become the most massive environmental problem which human beings are facing with, CO2is the greenhouse gas which is the largest contribution to the green house effect, CO2emissions is imperative. In china, coal-fired power plants are the most important CO2emissions source, the CO2emissions of coal-fired power plants is to be the key to slow greenhouse effect in our country, which is very important for china.There are many decarburization methods of coal-fired power plants, among them, chemical absorption method is one of the most practical of CO2emissions feasibility method because of its long history, mature technology and stable operation. In all kinds of sorbents, aqueous ammonia is proved to be a new and efficient absorbent, which has lots of advantages such as strong absorptive capacity and lower heat requirement of regeneration.This paper applies the Aspen plus software to build the model of CO2removal system. Based on the model, the structure parameters of device and operating parameters of system are optimized. The effects of key parameters on the energy consumption of CO2absorption system are revealed. Taking the practical operation situation of power plants into account, the minimum regeneration energy consumption is obtained through the optimization of parameters while the loss of ammonia is less, which is around2.09MJ/kgCO2.A600MW unit is selected as the reference unit. The steam cycle system model of the coal-fired has been established and the integration model of CO2removal system with the power plant is developed. This paper proposes three kinds of integrated on ways and analyzes the effects of different integration ways on the performance of the power plant because of additional decarburization system. The simulation results show that the efficiency penalty of power plant is around4-6percent points reduction because of the addition of ammonia-based CO2removing system.The research achievements will provide a useful reference for the design and parameter optimization study for the ammonia-based CO2removing system, and CO2capture from the coal-fired power plant with less energy penalty.