Simulation And Experimental Study On The Integration Of The New Type Calcium Based Carbon Capture System And Thermal Power Station

In recent years, environmental problems caused by CO2 emissions have become increasingly prominent, while capturing CO2 in the flue gas to reduce CO2 emissions from the conventional coal-fired power plant is significant, CaO-based sorbents cyclic carbonation/calcination reaction system is considered as one of the most promising and competitive technology in post-combustion capture technology because of its low cost absorbent wide sources of raw materials that are readily available and can be recycled. This paper can be divided into two parts.The first part of this paper is the experimental section. In this section, the monomer fluidized bed experimental station is built and a flue gas analyzer is used to measure the CO2 and SO2 volume fraction versus with time. Besides, Matlab software is used to fit the experimental data and calculate the conversation of the calcium in the CO2 capture process and the microstructure of particles is observed by the scanning electron microscopy(SEM). The experimental results show that, SO2 will reduce the capacity of the absorbent carbon capture and shorten the reaction time. What’s more, the decomposition of CaCO3 will hinder the absorption of SO2 and the SO2 capturing rate of the sorbents in carbonization stage is less than that of the calcinations stage. The surface pores of the sorbents after numerous of cycles with SO2 is less than that of the sorbents without SO2 and thus greatly reduce cycle conversion rate of the calcium. The conversion rate of the sorbents in the flue gas with or without SO2 present the similar trend and decreases with increasing cycle. With the decrease of the particle size of the absorbent, the conversion rate of the cycle is increased.With the Aspen Plus software, a 600MW coal-fired power plant integrated with a new CaO-based sequential desulfurization and decarburization system is proposed. The parameters of the new system is optimized and compared with the CaO-based sorbents cyclic carbonation/calcination reaction system under the same CO2 capture rate of 85%. In addition, three deep heat integration methods are proposed, seven cases of a 600MW power plant integrated with CO2 capture process are investigated. The simulation results show that, the optimal thermal efficiency of the new system integrated with the power plant is 1.06% higher than that of new system. Moreover, among five deep system integration cases, the maximum system thermal efficiency is 3.01% higher than that of the traditional system. At the same time, the energy consumption of the new system, especially the energy consumption of the air separation and CO2 compression are less than the standard system.