Research On Desorption And Regeneration Of Decarbonization Solution Using Ammonia Method In The Process Of CO₂Capture

In recent years, with extensive use of fossil fuels such as coal, oil, gas, combustion of CO2has increased substantially. The greenhouse effect caused by global warming has become a hot issue for the world’s attention and discussion. Emissions of CO2are directly related to China’s sustainable development and carbon emission reduction is the only way to solve the environmental pollution. The problems of carbon capture technology are the initial investment, equipment corrosion, difficult to recycle and reuse et al. Therefore, an important topic of carbon capture and desorption are low-cost, efficient and the decarburization absorbent can be recycled, recycling.In this study, desorption solution is desorption and regeneration of decarburization solution using ammonia method. Desorption experiment using self-designed system to expand in-depth study on ammonia decarburization desorption of CO2. Analysis of the impact of the basic condition, liquid coexist composition, auxiliary additives, mass transfer and reaction kinetics of CO2desorption process. Under the atmospheric pressure and nitrogen as carrier gas, several effects related to desorption of simulated decarburization solution were analyzed, such as temperature, solution concentration, pH and loading capacity et al. The results showed that the CO2desorption ratio increases with the increases of temperature, solution concentration and loading capacity, but CO2desorption percent increases with the increasing the pH and then decreases. Flue gas with SO2, NOx and HCl transfers to the liquid on process of ammonia carbon capture. Study on solution coexisting components to affect desorption of decarburization solution using ammonia method. Describes the reaction mechanism is SO2, NOx, CO2and ammonia method. Solution coexisting components are related to desorption of simulated decarburization solution were analyzed, such as (NH4)2SO3、(NH4)SO4、NH4NO3、 NaCl、NH4Cl and (NH4)2CO3et al. Studies have shown that desorption of CO2is affected by the different mass fraction of liquid phase coexistence composition, solution pH and surface tension. Most of solution coexisting components could reduce CO2desorption of decarburization solution. Different zeolites added into decarburization solution will increase the amount of CO2desorption, among these, zeolite10X has the most significant role. CO2desorption efficiency increases from16.08%to26.79%when zeolite10X is added into solution. Mechanism research shows that, the particular structure and performance of zeolite, such as selective adsorption for NH4+micro-bubbles produced in the surface of zeolite etc. generates enhancement for CO2desorption. The experiments proved that the reaction was a second order reaction, the activation energies is67.5kJ/mol and a reaction rate constant is9.8×106exp(-8113/T).