| The problem of energy shortage has been the focus of the whole society,and the non renewable of fossil energy is an urgent problem for all mankind.As the fourth largest energy source in the world,biomass energy is a kind of renewable energy,which is contained in plants and has great exploitability.Bamboo is an important forest resource in China and one of the most important biomass energy resources on the earth.With the development of science and technology,bamboo flooring industry is becoming stronger and stronger.Nowadays,with the increasing production of bamboo flooring,the treatment and utilization of waste bamboo flooring is an urgent problem to be solved.If the bioenergy in waste bamboo flooring can be extracted and utilized through pyrolysis process,it will be of great significance to solve the world environmental problems.In the past 10 years,the technology of bamboo charcoal,bamboo vinegar and other products from bamboo has become more and more mature.However,after long-term extrusion and deformation,the structure of waste bamboo flooring has changed.Whether waste bamboo has utilization value is still unknown.How waste bamboo will change after high temperature treatment needs further study.In order to explore the pyrolysis characteristics and utilization value of waste bamboo flooring,this paper analyzed the pyrolysis data of crushed bamboo flooring particles by thermogravimetric analysis(TGA)and kinetic analysis.Pyrolysis experiments were carried out to explore the differences between the pyrolysis characteristics of waste bamboo flooring and new bamboo flooring.The different heating rate,heating rate and heating rate were studied by controlling variable method The effects of particle size and atmosphere on the pyrolysis characteristics of the experimental materials were investigated.The thermodynamic parameters of the experimental object can be obtained by pyrolysis experiment.The kinetic model of the experimental object is established,and the activation energy E and frequency factor A are obtained by coats Redfern kinetic integral method,which provides a perfect data theory for the establishment of pyrolysis characteristics of waste bamboo flooring and theoretical support for the secondary utilization of waste bamboo flooring,In the thesis,the following conclusions are obtained through experiments and calculations.(1)The pyrolysis process of waste bamboo flooring can be divided into four stages:drying stage,weight loss preparation stage,main weight loss stage and carbonization stage.(2)Under different conditions,the pyrolysis process of waste bamboo flooring can be affected in different degrees.The heating rate has a great influence on the pyrolysis of waste bamboo flooring in nitrogen atmosphere,which is mainly reflected in the main weight loss stage.In the pyrolysis process of waste bamboo flooring with diameter of 0-0.425mm,40 mesh particles(diameter of 0.25-0.425mm)can produce the largest weight loss,about 84%.It was found that oxygen promoted the pyrolysis of waste bamboo flooring in different atmospheres.(3)According to coats Redfern integral method,the main weight loss stage of waste bamboo flooring conforms to the kinetic mechanism function "two-dimensional diffusion",and the activation energy of waste bamboo is about 30kj/mol.With the increase of heating rate,the pre exponential factor increases to a great extent,and the activation energy does not change with the increase of heating rate. |
