Nitrogen gas was used as the carrier gas and to maintain the system in inert condition. The effect of nitrogen flow rate on the yield of the pyrolysis products was studied at temperature of 550oC and heating rate of 50oC/min.
The flow rates of nitrogen used in this study were 2, 3, and 4 L/min.
The increases of nitrogen flow increase the result of bio-oil. The high flow of nitrogen encourages the release of organic vapours from the solid particle and exits the reactor faster therefore it minimizes the occurrence of secondary cracking.
However, the effect of the nitrogen flow on the yield of bio-oil is not significant as indicated in Figure 2c.