A New Integrated System Of CO₂Capture With CaO And Experimental Research

Controlling and reducing CO2from fossil fuel combustion is significant for the mitigation of global warming. CO2capture and storage(CCS) has been studied extensively in recent years, as the major means to reduce CO2emissions in coal-fired power plants. The use of CaO as a circulating sorbent in post-combustion capture is considered as the most promising technology,due to its widely accessiblity, recycl ability and economics. The article includes two aspects of content,that is the relevant laws of experimental research and the integrated system simulation.First of all, the reactor and experiment platform of Ca-based CO2capture is designed. By controlling the reaction temperature, carbonation process and calcining process can be reacted in one reactor. The experiment platform includes the reaction zone, temperature control device, gas supply part and online measurement equipment. After the successful commissioning test the platform can be worked stably.Secondly, this paper compares different experiment conditions of Ca-based CO2capture from several researchers. On the basis of analysis, the experimental condition and research contents of this study has been determined. Through the analysis of the change of CO2concentration measured by flue gas analyzer in the process of calcination/carbonation ten times, the recycling conversion rate of absorbent can be got from the concentration curve fitting using Matlab. In addition, element analysis of limestone sample and SEM observation of the absorbent which is recycled are carried out. In the later stage of the experiment, SO2is added to the mixed gas. The impact of SO2to calcination/carbonization process is analyzed, and the principle of absorbing SO2in the mixed gas by absorbent with performance degradation after many cycles is studied.In the aspect of system simulation, the hybrid system flowchart which is combined with Ca-based CO2, SOFC, gas turbine and HRSG is designed and simulated by Aspen Plus.In the condition of the unchanged original plant parameters, the variation of the performance parameters after adding different modules is compared. Meanwhile, the performance change of the whole system caused by the variation of calcination temperature, CO2capture rate and fuel cell stack pressure is analyzed.