Study On Microstructure And Combustion Mechanism Of Biomass Briquettes Combustion

Biomass is a kind of renewable energy, much attention is wide paid to it, which is developed and used by many countries in the world. China is a large agricultural country. Crop stalks resource is abundant in the country. Effective utilization of crop stalks, forestry waste, and other biomass, which is one of the important ways to solve rural and urban life energy problems, and also leads to good economic, environmental and social benefits. Biomass combustion use as a biomass use way, and it is gradually being accepted. Biomass compact molding technology has matured, but the technology of biomass briquettes combustion equipment is still immature. Because of people knew a little about the microstructure and combustion mechanism of biomass briquettes combustion, which leads to selection inaccurate design parameters of boiler and the combustion efficiency decreasing of biomass briquettes combustion. Thereby it affects the entire technology promotion.In order to solve the above technical problems, we put forward the study on microstructure and combustion mechanism of biomass briquettes combustion. This study tests the microstructure from the start, which finds the different structure of biomass briquettes combustion, and also analysis the combustion mechanism of biomass briquettes combustion and the combustion dynamics influencing factors. Our study is basis of biomass briquettes fuel efficient use. Through rigorous scientific testing and the accuracy of the data processing, the content and conclusions of this study are as follows:1. Using scanning electron microscopy, we observed the microstructure of the corn stalks, bean straw and sawdust briquette combustion. We concluded the microstructure characteristics of them, and the impact of the structure to their combustion mechanism.2. Using a special porosity measuring device, we tested the relative porosity of corn stalks, bean straw and sawdust briquette, reached their relative porosity. And formulated a relative porosity testing standards of them, developed and standardized the testing of relative porosity.3. Using the LCT-2B differential thermal balance, we researched the corn stalks, bean straw and sawdust dense briquette combustion. We analyzed the eigenvalues of the TG,DTA,DTG curve of them, and the heating rate and fuel fineness of the curve. And using thermal analysis systems and Excel software, we made the linear regression analysis to the test results, obtained kinetics parameters activation energy E and frequency factor K₀.4. Through orthogonal design and the self-made test device combustion, we test combustion speed different factors of biomass briquettes fuel, and make the multi-factor analysis of variance using SAS and Excel software. The results show that the reaction temperature impacts most significantly to the average speed of biomass briquettes fuel combustion, Secondly, for air volume, the final fuel relative porosity effects.