Co-pyrolysis Characteristics And Kinetic Analysis Of Microalgae And Sawdust

Algae has many advantages.The Thermochemical conversion technology has been widely used in algae treatment,at the mean time,the co-pyrolysis of algae and other substances has also become an important research issue Based on microalgae clean energy technology,this paper discusses the co-pyrolysis characteristics of chlorella and pine sawdust,the interaction between the two during co-pyrolysis and the best incubation time for the chlorella film formation experiment(ie,the best co-pyrolysis material ratios)This study was conducted to determine whether the mixture of chlorella and pine sawdust could be converted to thermochemical methods by the way of rapid pyrolysis liquefaction.First of all,elemental analysis and industrial analysis were performed on chlorella and pine sawdust,respectively.Thermogravimetric analysis was performed on chlorella and pine sawdust at three linear rates of temperature increase rate using thermogravimetric analyzer.Reaction conversion,and the TG and DTG curves were carried out at the same time.The pyrolysis characteristics of chlorella and pine sawdust were also analyzed.Then the mixture of chlorella and pine sawdust was mixed proportionally to obtain the mixture M.The thermogravimetric experiments of the mixture M were carried out under three conditions of linear heating rate,and the interaction between the two pyrolysis stages is analyzed.In addition,the mixing ratio of chlorella and pine sawdust(days of incubation)and the effect of heating rate on the interaction between the two were also examined,and a value CPI was used to evaluate the pyrolysis of chlorella,pine sawdust and mixture M.degree.The results showed that the optimal culture time for the chlorella film formation experiment was 12 days.However,when the chlorella and pine sawdust co-pyrolyzed at different heating rates,there was a mutual inhibitory effect between them,and the higher the heating rate,The stronger the mutual inhibition is.This provides reference for the suitability of chlorella and pine sawdust for co-pyrolysis..At the last of the reaserch,the FWO and KAS methods were used to calculate the apparent activation energies required for the pyrolysis reactions of chlorella,pine sawdust,and mixture M,further validating the interaction between Chlorella and pine sawdust.The kinetic analysis of the co-pyrolysis of the mixture M of Chlorella and pine sawdust was performed using the distributed activation energy model,and the temperature value at each conversion rate and the experimental temperature value of the pyrolysis stage calculated using the Miura-Maki DAEM model were used.The Fitting shows that the consequent is very good.However,the apparent activation energy required for the pyrolysis of the mixture at different conversions for different days was greater than that of Chlorella.In conclusion,microalgae and sawdust are not suitable for co-pyrolysis,and the mixture of them is even more unsuitable for the thermochemical conversion of fast pyrolysis liquefaction technology with a higher heating rate.In the practical application of pyrolysis to prepare the thermochemical conversion of bio-oil and biogas,it is still necessary to separate the mixture of microalgae and sawdust obtained in the microalgae biofilm reactor.