为提高生物质燃料的燃烧效率,缓解生物质电厂锅炉的腐蚀问题,在不同的氧气化学当量比(14％和42％)及不同升温速率(10℃/min、30℃/min、60℃/min)下,采用热重-差热分析(TG-DTG)联用技术,以桉树干为基准燃料,对桉树枝、桉树皮和甘蔗渣混燃过程中的燃烧特性进行研究分析.结果表明,各燃料燃烧过程具有相似性,在同等升温速率下,桉树干在燃烧过程中表现出一定的滞后性,如10℃/min下M1-M5的最大失重速率在325～330℃之间,桉树干则在336℃时有最大失重速率.同时,随着氧气化学当量比的增大及升温速率的降低,各燃料的燃烧特性有所提高.此外,在14％O2条件下掺配比例较高的甘蔗渣(M2),在42％ O2条件下掺配中低比例的甘蔗渣(M4)均能提高生物质燃料的前期可燃性和综合燃烧特性,但燃尽特性较差.因此,甘蔗渣等草本类植物可作为难点燃的木质类物质的助燃添加剂,为生物质电站的高效稳定运行提供一定的参考.
In order to improve the combustion efficiency of the biomass fuel and alleviate corrosion problems in biomass power plant boiler.Under different oxygen stoichiometric ratio (14℃ and 42％,respectively) and different heating rates (10 ℃/min,30℃/min,60 ℃/min),using thermogravimetric analysis (TG-DTG) techniques on eucalyptus trees for fuel comparison,woody and herbaceous biomass of mixed fuel thermal cracking process and combustion characteristics were analyzed.Results show that every combustion processes are similar,under the same heating rate,eucalyptus trunk in combustion process performances a certain lag.Such as 10 ℃/min volatile at the analysis stage,M1-M5 perform maximum weight loss rate between 325-330 ℃,and eucalyptus trunk is in 336 ℃ with maximum weight loss rate.At the same time,with the increase of oxygen chemical equivalence ratio and the reduction of heating rate,the combustion characteristics of various fuels have been improved.In addition,in 14℃ O2 condition blending a higher proportion of bagasse (M2),in 42％ O2 under the condition of low mixing proportion of sugarcane bagasse (M4) can improve the early flammability and combustion characteristic,but the burnout characteristics perform poor.Therefore,bagasse and other herbaceous plants as the combustion supporting additive to ignite wood material,for the efficient and stable operation of biomass power plant to provide some suggestions.
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