Bio-oil distribution in different condensers
Fig. 5 shows the variation of the bio-oil yields in the three condensers and the cotton filter with the operating temperature of the C-ESP. Even though the condenser 1 is operated at the same temperature in all the three experiments, Fig. 5 shows a slight increase in the bio-oil yield of condenser 1, which is caused by minor changes in the temperature of the first condenser. With the increase in C-ESP temperature from 40 to 70◦C, the bio-oil yield of the C-ESP decreased and the yield of condenser 3 increased. In all the three experiments, the bio-oil yield of the cotton filter is less than 1%,which indicates efficient functioning of the condenser train.As the first condenser and the C-ESP are expected to collect bio-oil with low water content, the bio-oils recovered in condenser 1 and C-ESP are combined and hereafter referred as the “oil fraction”.As the bio-oil captured by the cotton filter is very small, the bio-oil recovered in the condenser 3 is hereafter referred as the “waterfraction”, and the very minor amount recovered in the cotton filter is assumed to have the same composition. Fig. 6 shows that as the C-ESP temperature is increased, the yield of the oil fraction is slightly decreased and the yield of the water fraction is slightly increased.The raw bio-oil is defined as the total bio-oil produced, and the yield of the raw bio-oil is the summation of the yields of bio-oil collected in the three condensers and the cotton filter. Fig. 6 also shows that the yield of the “raw bio-oil” is around 36 wt% in all the three experiments, showing very good reproducibility under the same operating condition of the bubbling bed reactor.