Integration And Optimization Of Calcium-based CO₂ Capture System In Coal-fired Power Plant

High emissions of greenhouse gases such as CO₂ is the main factor causing global warming. Coal is the main energy of electric production in our country. Burning coal produces CO₂, which occupy about 50% of the total CO₂ emissions. And it is the largest source emissions of CO₂ in China. Therefore, reducing the emissions of CO₂ in coal-fired power plants has a great significance to control global warming and the greenhouse effect.In this paper, through Aspen Plus software to simulate the system performance, which is built by using the calcium-based sorbent cyclic calcinations/carbonation to capture CO₂. The influence of the hydration reaction module on the decarburizations unit performance is analyzed. The results showed that the decarburizations unit used in the hydration reaction module can reduce the energy consumption of carbon capture system, and improve the thermal performance of the system.Based on 1000 MW supercritical unit, domestic coal-fired thermal power unit thermodynamic system and the CO₂ capture system of 5 kinds of integration program was studied. The results showed that: the original unit thermal system scheme in transforming, the three kinds of integration program compared with the original unit, it's power efficiency is down by 8.55%⁸.55%, The cost of investment increased by 18.88%²3.7%. The third scheme for best performance, it's power efficiency is 33.55%, power generation cost is 228.33 ?/MWh, cost of emission reduction CO₂ is 55.53 ?/t; in the new 300 mw turbine using waste heat integration system, the 5th program showed better performance. It's generating capacity of 1143.4 MW, increased by 19.73% compared with the original unit, power efficiency was 35.62%, power generation cost is 219.85 ?/MWh, cost of emission reduction CO₂ is 42.54 ?/t.Compared with 5 kinds of integration program results showed that: a new 300 mw turbine unit integration system generating capacity increased by 20.1%⁴6.07% than the original unit integrated system; the hydration reaction in carbon capture module can effectively improve the integrated power generation system thermal efficiency, and reduce the cost of power generation, CO₂ emissions; carbon capture of hydration reaction system with the integration of new 300 mw turbine unit has better thermal performance and economic performance.