DEVELOPMENT OF CARBON OXIDES SEQUESTRATION FROM YAMAHA EF1000 GENERATOR USING POST-COMBUSTION CAPTURE TECHNIQUE

DEVELOPMENT OF CARBON OXIDES SEQUESTRATION FROM YAMAHA EF1000 GENERATOR USING POST-COMBUSTION CAPTURE TECHNIQUE

ABSTRACT

This work aimed atdevelopment of carbon oxides sequestration from Yamaha EF1000 generator using post - combustion capture technique. The state of the art is the use of monoethanolamine as sorbent for carbon sequestration. The present study postulated reaction mechanism of sawdust ash leachate with CO2 from flue gas and examined the use of the leachate as sorbent for capture of CO2 and CO from Yamaha EF1000 generator as the source of flue gas. A prototype absorber was designed and fabricated to specifications of 8.2cm column diameter, overall column height of 11.4cm, column pressure drop of 1531.32N/m2 and volumetric hold-up of 0.32cm3 absorber liquid/cm3 column. The Kipps apparatus were appropriately connected to the source of the flue gas in countercurrent movement of the flue gas with the sorbent. Modelling and optimization of the process were carried out using design expert version 10 with concentration of absorber liquids, process time and absorber liquid flow rate as the process variables. Quadratic models were obtained as the best models for the capture for each of the sorbents with CO2 and CO of the exit flue gas as response. For the ash leachate, the CO2 and CO composition of exit flue gas values of 3.557% and 16.768% as optima respectively, at sequestrant concentration of 21.795g/L, sequestration time of 9.997mins and sequestrant flow rate of 200.278cm3 /min respectively were achieved. Optimum CO2 and CO composition of exit flue gas values of 4.139% and 18.959% respectively, and at the respective factors of 20.044g/L, 5.666mins and 223.848cm3 /min for sequestrant concentration, sequestration time and sequestrant flow rates respectively for monoethanolamine, were also obtained. From the results, the quadratic models best described the carbon sequestration process for both the leachate and the conventional monoethanolamine. CO2 and CO capture achieved with the leachate was about 8% more than that achieved with the conventional monoethanolamine. The postulated mechanisms of the leachate appropriately described the behavior of the leachate with CO2 from flue gas of Yamaha EF 1000 based on kinetics of the reaction obtained which agreed with the experimentally determined rate law. Capturing of CO with either monoethanolamine or sawdust ash leachate could not be seen published. This work has established that sawdust ash leachate can effectively be used as sorbent in place of the conventional monoethanolamine for Post – Combustion capture of CO2 and CO.

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