– Design And Development of A Carbonator For Carbon Dioxide Capture Using Locally Produced Lime –
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The work seeks to address environmental issue through the design and development of a carbonator for CO2 capture. A fixed bed carbonator with height 1.7 m and diameter0.9 m for CO2 capture was successfully designed and fabricated at a flow rate 7.9g/hr of carbon dioxide using 2kV household electric generator as a source of flue gas.
The flue gas was analyzed using NHA-506EN NANHUA Instrument gas analyzer and the average composition of the flue gas after allowing the generator to ran for 30min was found to be 7.78% CO, 2.50% CO2, 46ppm NOx, and 392ppm HC.
The material of construction used was mild steel and the fabrication was based on the specifications obtained from Aspes Plus version 11.1 software.
Hydrated lime Ca(OH)2 powder was made into pellets of different sizes: 0.8, 1.2, 1.5 and 2cm and packed differently at a height of 0.4m in the carbonator.
Flue gas at 150oC was passed through the bed of hydrated lime at 1atm. The average readings obtained from the outlet of the carbonator(top) were found to be 7.71%CO, 0.06% CO2, 46ppm NOx and 390ppm HC.
1.1 Background of the Study
Carbon dioxide (CO2) is a naturally occurring gas which plants use to live and grow. Over millions of years, plants and algae have been buried to produce oil and natural gas deposits, effectively ‗locking away‘ the CO2 they were using.
When fossil fuels are burned to produce electricity, the carbon within them is released back into the carbon cycle as CO2. This is now being emitted at such a rapid rate that the Earth‘s natural carbon cycle cannot accommodate.
Rising concentration of CO2 in the atmosphere is causing climate change; this involves global warming, increases in extreme weather events, ocean acidification and sea level rise.
Reducing the rate of CO2 emissions is, consequently, a priority (Research Council UK, 2008).Fossil fuels, namely coal, natural gas, and oil, are currently the dominant sources of energy used for electricity generation worldwide.
Nearly 70% of the world‘s electricity is derived from a fossil fuel source with coal accounting for 41% of the world‘s electricity generation (IEA, 2010).
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