Experimental Study on Absorption of CO_2Using DBU Solution in a Bubbling Bed
【摘要】：Anthropogenic activities have been discovered to be the chief contributor to the deterioration of today's climate. Transportation and particularly industrial processes or activities because of its heavily dependence on the use of coal as a source of fuel are just a few and most practical examples that generates billions of pollutants especially greenhouse gases into the atmosphere and the presence of these pollutants adversely causes great havoc to the atmosphere. In order to mitigate climate change, there is a desperate need to reduce CO2emissions from different sources.
Carbon Capture and Storage (CCS) offers the opportunity to reduce the CO2emissions associated with the use of fossil fuels. Carbon dioxide capture with a regenerable solvent is considered to be a mature technology, since it is successfully applied as CO2removal technology in industrial applications.
Absorption of carbon dioxide (CO2) from flue gas was investigated in a bubbling bed using DBU (1,8-diazabicyclo [5.4.0] undec-7-ene) aqueous solutions. DBU is a typical tertiary amine which has a stoichiometric capability of capturing CO2at1:1ratio. The bubbling bed is a simple tool or device (as per the research would be referred to as "reactor"), within which the absorbent is placed and the CO2absorption also takes place. CO2absorption under six main parameter conditions were studied; the effect of absorbent concentration; the effect of gas flowrate; the effect of solution pH; the effect of solution temperature; the effect of solution height and the effect of solution viscosity.
The experimental results showed that DBU solution under conditions of low absorbent concentrations have better collection efficiency whiles concentrations higher than30%collection efficiency remained almost unchanged. The experimental results again showed that the CO2removal efficiency increased with the solution height increasing. CO2removal efficiency increased with increase in solution pH. CO2removal efficiency decreased with both gas flow rate and solution temperature increasing. The last but not the least, increases in solution viscosity leads to an increase in the CO2removal efficiency.