Study On The Separation Method And Pyrolysis Characteristics Of The Six-component Chemical Groups Of Biomass

As a green energy with great development prospects,biomass energy has the advantages of a wide range of sources,zero CO₂ emissions,short growth cycle,fast growth,clean and renewable energy,and has become the first choice and focus of energy transformation in response to climate change and carbon neutrality.It is an effective way to optimize and improve thermal conversion technology at the molecular level by composing the thermal transformation behavior and reaction mechanism of biomass through the chemical groups.Traditional biomass thermal conversion research is mainly based on the three major components of cellulose group,hemicellulose group and lignin group.However,there are many types of biomass.Biomass such as algae,food waste,and oil crops also contain a large amount of oil esters,protein,and starch.The three-component research method has poor general applicability.Hence,the research group of China University of Petroleum（East China）Tian Yuanyu proposed the concept of the six-component chemical groups.According to the chemical similarity,the biomass is divided into six chemical groups:cellulose,hemicellulose,lignin,oil ester,protein,and starch,and a six-component chemical group separation method suitable for all biomass is proposed.In this paper,the single-factor control variable method is used to study the separation process parameters of each chemical group in detail.Eight kinds of real biomass were selected and separated according to the optimal process parameters to obtain the content of each chemical group of different biomass.The optimal separation method of the six-component chemical group of biomass was established to realize the efficient separation of the chemical group of biomass.Then,the similarity analysis of the chemical groups were carried out to further verify the feasibility of the separation method of the chemical groups.Through elemental analysis,the element composition and H/C and O/C atomic ratios of the six components obtained from the real biomass separation and the industrial six components were compared.Through infrared analysis,the main absorption peaks of the extracted six components and the industrial six components were compared.Through TG-FTIR analysis,the pyrolysis behavior and gas phase products of the extracted six components and industrial six components were studied.Finally,Py-GC/MS was used to analyze and compare the pyrolysis products of six components and industrial six components.Through the above four works,the feasibility of the separation method of the six-component chemical groups of biomass is fully verified.Finally,the pyrolysis of eight different biomass materials was studied by TG-FTIR and Py-GC/MS.The results show that different biomass raw materials contain different chemical groups,and the pyrolysis behavior and products are quite different.Then,three typical biomasses of pine,soybean,and rice,and the respective chemical group components were obtained through the optimal technology,were selected as the experimental raw materials.The effects of heating rate and final pyrolysis temperature on biomass raw materials and their chemical group pyrolysis were investigated by DTG,TG FTIR and Py-GC/MS.