The Studies On The Pyrolysis Characteristics Of Poplar And Pine Wood

With the progress of human society and the development of industrialization,the excessive exploitation and utilization of fossil energy makes mankind face the increasingly exhaustion of energy and severe environmental problems.As a renewable energy,biomass energy is an important potential energy and first development because of its rich resources and great potential for development.In order to clean and efficient use of biomass energy,various countries have carried out a series of development and research including biomass gasification,generation and pyrolysis of biomass,among which biomass pyrolysis is the most widely used technology.This paper focuses on and studies the recent situation and development trend of biomass energy at home and abroad.In connection with the specific situation of biomass energy utilization in China,we explore the research methods and contents of this paper through in-depth exploration of the combination of them.(1)Industrial analysis,element analysis and component analysis of poplar and pine wood were carried out.From the analysis results,the industrial composition of biomass mainly includes four parts of water,ash,volatile and fixed carbon.The elements are composed of 5 kinds,such as C,H,O,N,S and so on.The main components of biomass include cellulose,hemicellulose and cellulose.The pyrolytic behavior of lignin is considered to be the behavior of the synthetic pyrolysis of the three main components,because the chemical structure of the three components is slightly different,so the complexity of the pyrolysis process is determined.(2)Thermogravimetric analysis was used to study the pyrolysis characteristics of poplar and pine in three groups at different heating rates(15~55?/min,110~150?/min and210~250 ?/min).The results showed that the pyrolysis of poplar and pine wood two samples were divided into four stages: drying,preheating,pyrolysis and carbonization.And the pyrolysis trend of two samples at five(15,25,35,45,55?/min)low heating rate is similar.Because of the thermal hysteresis in the pyrolysis reaction,the TG curve moves to the high temperature zone with the increase of the heating rate,but the other two sets of heating rates(110,120,130,140,150?/min and 210,220,230,240,250?/min)are followed by the curves.The increase of heating rate shows the phenomenon of irregular movement to the low temperature zone,which indicates that the thermal hysteresis is not the leading factor.When the heating rate is within the range of 15~55?/min,the activation energy E and the correlation coefficient r of poplar and pine wood under 6(20%~70%)conversion rates are calculated by Ozawa method,and the correlation coefficient r is almost all between 0.991 and1,indicating that the activation energy is reliable.(3)The Fourier transform infrared spectrometer(FTIR)was used to analyze the spectral analysis of the raw materials of the two test samples of poplar and pine wood and three different pyrolysis residues at different termination temperatures,and compared the raw materials of the test samples with the infrared spectra obtained by the pyrolysis of the same temperature rate and the different final temperature.It is found that the shape of the spectral curve is similar to the whole trend,and the spectral curves are similar in the range of the same wavenumber,but the intensity of the absorption peak is significantly different.The FTIR spectra of different heating rates coincided with the trend of the curves,indicating that the components of the remaining substances were similar when the temperature of the pyrolysis was similar.In all the spectra obtained,only a few absorption peaks are left on the spectral curve after the pyrolysis reaction is over,and the absorption degree is low.This shows that the content of each component changes and the fiber structure changes with the pyrolysis reaction,and the polymer compounds have basically been decomposed into small molecules.The pyrolysis of biomass has been basically completed.