Research On The Combustion,Release And Slagging Characteristics Of Biomass

Biomass straw is a renewable energy source.Choosing biomass straw as fuel can not only improve the current energy structure of the world’s over-reliance on non-renewable energy,but also dispose of biomass straw that has not been used in the countryside,turning waste into treasure.However,there are few studies that comprehensively analyze the combustion characteristics,emission characteristics,and slagging characteristics of biomass straws and apply them to large-scale power production at present.This paper will study about this.The wheat straw,rice straw,millet straw,and tobacco straw were evaluated for combustion characteristics,emission characteristics,and slagging characteristics to overcome the challenge of using biomass straw in power plants.A set of assessment procedures for biomass straw utilization in large-scale power industry is proposed to guide the feasibility of using biomass straw in power industry.The wheat straw,rice straw,millet straw,and tobacco straw were subjected to proximate analysis and high heating value measurement.It was found that wheat straw had the highest volatile matter content and fixed carbon content,and the lowest moisture content and ash content.The high heating value of wheat straw is also higher than the other three biomass straws,which is 17.4 MJ/kg.The four biomass straw samples were subjected to thermogravimetric(TG)and thermogravimetric and mass spectrometry combined(TG-MS)experiments,the thermogravimetric curves were obtained from the thermogravimetric(TG)experiments were used to calculate four combustion indices(comprehensive combustion index,Flammability index,ignition index,burnout index)and Arrhenius activation energy.The results show that wheat straw has the highest combustion indices and stable kinetic parameters,which indicates that wheat straw has the best ignition and burnout characteristics and the most stable combustion process.TG-MS experimental results show that the SO2 emissions of the four biomass straws during combustion are low,and the content ratio of CO2 and CO in the gas released from the combustion of wheat straw is the highest,which is 1.17.It shows that the burning efficiency of wheat straw is higher than that of the other three biomass straws.Because biomass straws are mostly used in fluidized bed combustion systems(FBC),the ash fusion temperatures of the four biomass straws are measured using a microcomputer ash fusion temperature analyzer,and the ash fusion temperatures are compared with the combustion temperature of the fluidized bed.It found that only the ash fusion temperature of millet straw was lower than the combustion temperature of the fluidized bed combustion system,so millet straw had the most severe slagging during the combustion process,and the other-three biomass straws had slight slagging.In summary,among the four biomass straw samples,when wheat straw is used as a fuel,there are many advantages,and the disadvantages are relatively insignificant.This study also proposes a set of assessment methods for the application of biomass in large power plants.In the laboratory,through industrial analysis,combustion index analysis,kinetic analysis,TG-MS analysis,and ash fusion temperature analysis of crop straw samples,the feasibility of using biomass fuel for large-scale power industry production could be determined.