Absorption Of CO₂ By MDEA Solution And Its Compound System Under Atomization Coupling Dust Suppression

There are a large number of coal resources in China,which have been widely used in industry,especially in power plants.However,the emission of coal-fired power plants contains a lot of CO₂ and smoke.The emission of CO₂ has led to greenhouse effect and has serious dangerous to people's health.The emissiotn of smoke particles is also bad to our health.Therefore,the capture of CO₂ gas in combustion gas and the suppression of dust have become the primary task for the governance of environmental problems now.For the capture of CO₂ process,absorption is the most mature method and has been widely applied in industry,and MDEA is an absorbent with superior overall performance in absorption operations.The atomization technology can increase the gas-liquid or liquid-solid contacting area,so the atomization desulphurization technology and atomization dust suppression technology have been widely used.This subject introduces atomization technology for the capture of CO₂ and dust suppression from coal-fired flue gas.Based on the research of atomization absorption and atomization dust suppression,the process of absorbing CO₂coupling dust suppression by MDEA solution and its compound system are investigated,and the operating parameters are determined.A major innovation in this subject is absorption CO₂experiments coupling dust suppression.Firstly,the effects of the concentration of the absorbents,the atomization frequency,and the air flow rate on the atomization absorption of CO₂ have been studied.Experiments show that,for MDEA aqueous solution,the absorption rate of CO₂ increases with the increase of solution concentration and increases with the increase of atomization frequency.Within a certain range,the absorption rate increases with the increase of the air flowrate;Desorption experiments revealed that the MDEA solution desorbed after three absorption-desorption circles still has high CO₂ absorption rate.For the MDEA compound systems,the absorption rate of CO₂ by the MDEA/KOH compounded system is the highest.Secondly,the effects of solution concentration,atomization frequency and the air flowrate on dust suppression efficiency during atomization dust suppression have been studied.The experiment shows that for MDEA solution,the dust suppression efficiency decreases with the increase concentration of MDEA and increases with the increase of atomization frequency.Within a certain range,the dust suppression efficiency increases with the increase of the air flowrate;Tween-80 solution has higher dust suppression efficiency than PEG solution;For the MDEA compound system,the dust suppression effect of the MDEA/Tween-80 compounded system is the best,for which the dust suppression efficiency of the system reaches more than 80%,under different experimental conditions,higher than other MDEA compounded systems.Based on the above research,absorption CO₂ experiments coupling dust suppression have been carried out.Under different operating conditions,the CO₂ absorption rate of the coupling absorption rates are larger than the uncoupling dust suppression,and the process of coupling dust suppression enhances the absorption process.The addition of the dust suppression process,on one hand enhances the disturbance between the gas and liquid phases,on the other hand,the adsorption of droplets suppresses the entrainment,which not only achieves the purpose of enhancing CO₂ absorption,but also realizes dust suppression.Under experimental conditions,the enhancement factor is in the range of 1.00¹.79,and the dust suppression efficiency is in the range of 70%⁸5%.