Study On The Compound Pelletization And Combustion Characteristics Of Flammulina Velutipes Residue

Biomass Molding Fuel(BMF)are characterized by low carbon,cleanliness and reproducibility.They are easy to store,transport,and easy to industrialize.They have been developed and promoted by the country.With the expansion of market size,raw material resources are limited and prices continue to rise,which seriously restricts the scale development of related industries.Edible fungus residue is the waste of the medium left after the product is harvested from the cultivation process of edible fungus.It belongs to agricultural waste,and has a centralized distribution and huge output.It is a kind of biomass resource with huge development potential.This article takes the Flammulina velutipes residue(FVR)as raw material for biomass pelletization research,and systematically studies the influence of the key pelletization parameters of the mold residue on the pelletization characteristics,and uses the commonly used molding material pine sawdust as the reference to analyze the difference in the pelletization properties of the two.Based on a detailed study of the molding characteristics of the two types,SEM and FTIR analysis were performed on the two types of pellets,and the microstructure of the two types of pellets was investigated.The compound pelletization of the Flammulina velutipes residue and pine sawdust were studied.The ANOVA was made to obtain the pelletization technical index equation,the pelletization parameters were optimized,and the pelletization technical indicators were obtained.The best pelletization parameters satisfying the technical indexes were obtained for industrialized Flammulina velutipes residue and pine sawdust.The combustion characteristics of the pellets of the Flammulina velutipes residue and pine sawdust were studied.The combustion process of the two different heating rates and mixing ratios were analyzed,and the combustion characteristics index and dynamics analysis were obtained.The specific research content and main conclusions are as follows:1.The influence of the pelletization parameters of the Flammulina velutipes residue on the performance index was systematically studied.1.Through single-factor experiments,the effect of pelletization parameters on relaxed density,Meyer strength,and specific energy consumption was investigated.The results show that when the moisture content is 11-14%,the molding temperature is kept at 100-120?,the molding pressure is 3-5 kN,and the particle size range is 0-5 mm,the molding effect is better.The relaxation density under this condition>1100 kg/m~3,Meyer strength>22 N/mm~2,specific energy consumption<15 kJ/kg.2.Single factor pelletization experiments of pine sawdust were conducted with moisture,temperature,pressure,and particle size as variables,considering the relaxed density,Meyer strength and specific energy consumption,When the moisture content is5-14%,the molding temperature is maintained at 120-180?,the pressure range is 3-5 kN,and the particle size range is 1-5 mm,the molding effect is better.The relaxed density under this condition>1100 kg/m~3,Meyer strength>20 N/mm~2,specific energy consumption<20kJ/kg.3.Comparing the pelletization conditions of the two kinds of experimental materials,the Flammulina velutipes residue and the pine sawdust,in the conditions of the same factors such as moisture,temperature,pressure,particle size and other factors,the Flammulina velutipes residue of each molding index is relatively better than the pine sawdust.4.By comparing the SEM images of two shaped particles at different temperatures,pressures and particle sizes,the effect of forming factors on the particle quality was verified and analyzed from the microstructure morphology.The experimental results show that the temperature and pressure increase to 120? and 5 kN.At that time,the particles are more closely bound together.Through the FTIR analysis of the two materials,the reasons for the difference in the molding properties of the two materials were analyzed.It was found that the absorption peaks of-OH and C-O of the two raw materials are relatively obvious,and the two functional groups are relatively easy to form.Intermolecular hydrogen bonding plays an important role in promoting molding.5.We conducted research on the compounding and molding of Flammulina velutipes residue and pine sawdust.Through response surface experiment design,regression analysis was performed on experimental data to establish a response surface model of pelletization parameters to molding indicators.The interaction of influencing factors and indicators was analyzed to obtain molding model and optimal parameters.6.Using the method of TG experiment,the combustion experiment was carried out on the Flammulina velutipes residue,pine sawdust and mixed pellets.The combustion process of the two kinds of mixed pellets of the residue and pine sawdust was analyzed,and the combustion parameters and combustion kinetics equations were calculated.The burning experiments of three kinds of different heating rates were carried out for the two kinds of raw material pellets,and the effect of heating rate on combustion was studied.It was found that the combustion temperature range shifted to a higher temperature as the heating temperature increased.At the same time,the combustion conditions of different mixing proportion molding particles were compared,and the influence of mixing proportion on combustion characteristics and process was analyzed.haimeihuifuwo.