Carbon conversion efficiency (CCE) represent the percentage (%) of total carbon in the gasifier feedstock (i.e. coal or biomass) converted to product gases, which contain carbon (i.e. CO, CO2, CH4, C2H2, C2H4 and C2H6).
CCE (%) = 12 x Ydry gas x { [(CO + CO2 + CH4) + 2 x (C2H2 + C2H4 + C2H6)] / (22.4 x C) }
Where,
CO, CO2, CH4, C2H2, C2H4 and C2H6 are in % (v/v)
C is in % of carbon in dry feedstock
Ydry gas is dry gas yield in Nm3 per kg of dry feedstock
Gasifier energy efficiency can be given using two efficiencies i.e. cold gas efficiency (CGE) and hot gas efficiency (HGE) as per following formulas:
CGE (%) = [ CE x Ydry gas x 100 ] / (DBE+SE)
HGE (%) = [ (CE + PE) x Ydry gas x 100 ] / (DBE+SE)
Where,
DBE = Energy content of dry feedstock, MJ/kg
SE = Sensible energy of oxidizing agent, MJ/kg
CE = Chemical energy of dry gas, MJ/Nm3
PE = Sensible energy of hot gas, MJ/m3
Note: Tar is considered as gas impurity; hence, not included in above efficiencies.
Source: http://www.crcnetbase.com/doi/abs/10.1201/b16764-21
But how to find dry gas yield for steam gasification or co2 gasification sir
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