Experimental Study On Co-Pyrolysis Of Camellia Shell And Polypropylene

The co-pyrolysis of camellia shell and polypropylene could produce high value-added solid,liquid and gas three-phase products,which was significant for ensuring national energy security and promoting the realization of the goals of "carbon peaking" and "carbon neutrality".Through a series of experiments,this paper explored the co-pyrolysis characteristics of Camellia oleifera and polypropylene,reveals the reaction mechanism of co-pyrolysis,and studied the influence of operating conditions on co-pyrolysis to bio-oil,which provided a theoretical basis and scientific guidance for the practical application of co-pyrolysis between camellia shell and polypropylene.The main results of this article were as follows:(1)The slow co-pyrolysis characteristics and reaction kinetics of camellia shell and polypropylene were studied through thermogravimetric experiments,and the results showed that the slow co-pyrolysis shifted the peak of polypropylene to the high temperature zone,the apparent activation energy of camellia shell and polypropylene increased,which meant the slow co-pyrolysis inhibited the pyrolysis of Camellia oleifera and polypropylene.(2)The rapid co-pyrolysis experiment of camellia oleifera and polypropylene was carried out by sliding rail tube furnace,and the effect of rapid co-pyrolysis on the yield of products was analyzed,which revealed the mechanism of rapid co-pyrolysis.The results showed that the synergistic effect of rapid co-pyrolysis between camellia shell and polypropylene was the result of the joint action of volatile-volatile interaction and volatile-biochar interaction.Volatile-biochar interaction increased biochar yield,and volatile-volatile interaction inhibited the cyclization and aromatization of camellia shell,which reduced the bio-oil yield.Fast co-pyrolysis suppressed the formation of biochar.Volatilevolatile interaction inhibited the condensation polymerization of camellia shell volatile,and biochar catalyzed the pyrolysis of polypropylene,which decreased the yield of bio-oil.The interaction of volatiles and volatilesbiochar promoted the pyrolysis of polypropylene volatiles,which increased the pyrolysis gas yield.(3)The effects of mixing ratio,pyrolysis temperature and carrier gas flow on bio-oil yield and hydrocarbon compounds were investigated through orthogonal experiments.The results showed that the mixing ratio,pyrolysis temperature and carrier gas flow had a very significant impact on bio-oil yield,but not significantly on the hydrocarbon compound content,and the degree of influence of each factor on bio-oil yield was: mixed proportional pyrolysis temperature carrier gas flow.Under the conditions of 3CS7 PP mixing ratio,600 ℃ pyrolysis temperature,and 100 mL/min carrier gas flow,the maximum co-pyrolytic bio-oil yield of 76.04 wt.% and the higher bio-oil hydrocarbon compound content of 82.49 wt.% can be obtained.