Mechanism And Experimental Study On Carbon Capture Using Ammonia Solution

In recent years, with extensive use of fossil fuels such as coal, oil, gas, combustionof CO2has increased substantially. The greenhouse effect caused by global warming hasbecome a hot issue for the world’s attention and discussion. Emissions of CO2aredirectly related to China’s sustainable development and carbon emission reduction is theonly way to solve the environmental pollution. The problems of carbon capturetechnology are the initial investment, equipment corrosion, difficult to recycle and reuseet 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, absorption and desorption experiment using self-designed system toexpand in-depth study on absorption CO2using ammonia and ammonia decarburizationdesorption of CO2. The effects of ammonia concentration, ammonia flow rate, gas flowrate, gas temperature, CO2partial pressure and other factors on the volumetric overallmass transfer coefficient (KGaV), the gas phase mass transfer coefficient (kG) and theeffective mass transfer cross-sectional area (aV) were investigated using ammoniasolution as the absorbent in homemade spray tower and packing tower. Experimentalresults show that KGaVhas upward trend as the increasing ammonia concentration,ammonia flow rate and gas flow rate, and first increases and then decreases with the riseof CO2partial pressure and gas temperature; kGincreases with the increasing ammoniaflow rate, gas flow rate and CO2partial pressure, aVincreases with the increasingammonia solution and gas flow rates; CO2partial pressure has less impact on KGaV, kGand aV. CO2absorption using ammonia solution is controlled mainly by the liquid film.The experiments about CO2desorption from ammonium bicarbonate solution werecarried out in a packed tower and a no-packing tower. The results show that thedesorption performance of ammonium bicarbonate solution in packed tower is greatlybetter than that of no-packing empty tower. The desorption experiments on ammoniumbicarbonate, the main absorption product of carbon capture using ammonia method, werecarried out in a microwave reactor. Comparative experimental results show thatmicrowave heating has some promoting role on CO2desorption of ammoniumbicarbonate and energy saving. This paper provides technical data for the application ofcarbon capture using ammonia solution.