烘焙处理对烟草废弃物热解和燃烧特性的影响
Influence of torrefaction treatment on the pyrolysis and combustion characteristics of tobacco waste
-
摘要: 以烟草废弃物为对象,利用结构组成分析及热重分析方法研究烘焙处理对其微观形貌、元素组成、热解和燃烧特性的影响规律。结果表明:烘焙处理可降低样品平衡含水率和氧元素含量,提升碳元素含量,高位热值由原始的17.15 MJ/kg提升至19.05 MJ/kg;烘焙过程中烟草废弃物发生明显的脱水和脱羧反应,随着烘焙温度的升高,样品色泽逐渐加深,且高温烘焙后的烟草废弃物表面出现气孔,微观结构被破坏。烘焙温度对烟草废弃物的热解过程影响明显,表现为降低挥发性成分析出阶段的失重率,热解残余质量由原始的27.00%提升至40.13%(240 ℃烘焙),随着烘焙温度升高,起始分解温度和终止分解温度均向高温方向偏移,综合热解指数逐步提高至2.07×10-4%/(min·℃2),主要热解失重阶段的高斯分峰拟合能够较好地反映样品中各组分的比例变化;高烘焙温度可提升烟草废弃物的引燃温度和燃尽温度,210 ℃烘焙样品的综合燃烧特性指数最高,为11.87×10-7%/(min2·℃3)。各样品的热分解过程均符合化学反应控制模型,烘焙处理可改变样品主要失重阶段的反应活化能。烘焙处理可作为烟草废弃物的预处理手段以提升其能量密度,改善其热解燃烧特性。Abstract: Tobacco waste was selected as the research object, and structural composition analysis and thermogravimetric analysis methods were used to study the influence of torrefaction treatment on its micro-morphology, elemental composition, pyrolysis, and combustion characteristics. The results showed that torrefaction treatment reduced the equilibrium moisture content and oxygen content of the samples while increasing the carbon content. The higher heating value increased from the original 17.15 MJ/kg to 19.05 MJ/kg, which increased the energy density of the samples, facilitating storage, transportation, and thermochemical conversion and high-value utilization of tobacco waste. During torrefaction, tobacco waste underwent obvious dehydration and decarboxylation reactions. As the torrefaction temperature increased, the surface color of the samples gradually darkened, and it gradually turned charcoal-like. SEM observation showed that after high-temperature torrefaction, the tobacco waste had pores on its surface and its microstructure was destroyed. The effect of torrefaction temperature on the pyrolysis process of tobacco waste was significant. This was reflected in the reduction of the weight loss rate during the volatile component release stage. The pyrolysis residual mass increased from the original 27.00% to 40.13% at a torrefaction temperature of 240 ℃. Both the onset and termination decomposition temperatures shifted to higher values with increasing torrefaction temperature. The comprehensive pyrolysis index gradually increased to 2.07×10-6%/(min·℃2). Gaussian peak fitting of the main pyrolysis weight-loss stages could better reflect the changes in the proportion of each component in the sample. An increase in torrefaction temperature raised the ignition and burnout temperatures of tobacco waste. The sample torrefied at 210 ℃ had the highest integrated combustion characteristic index of 11.87×10-7%/(min2·℃3). The decomposition kinetics analysis of the main weight-loss stages during pyrolysis and combustion showed that the decomposition process of each sample followed the chemical reaction control model, and torrefaction treatment altered the reaction activation energy during the main weight-loss stages of the samples. Torrefaction pretreatment can be used as a pretreatment method for tobacco waste to enhance its energy density and improve its pyrolysis and combustion characteristics.
-
-
[1]
张峻松,朱鑫超,王姗姗,等.基于水热碳化技术的废弃烟末制备水热炭和碳量子点研究[J].轻工学报,2023,38(4):105-112.
-
[2]
王金棒,池哲翔,李源源,等.烟草在燃料制备领域的研究现状与展望[J].轻工学报,2023,38(6):118-126.
-
[3]
CHEN H P,LIN G Y,CHEN Y Q,et al.Biomass pyrolytic polygeneration of tobacco waste:Product characteristics and nitrogen transformation[J].Energy & Fuels,2016,30(3):1579-1588.
-
[4]
YAN B C,ZHANG S P,CHEN W B,et al.Pyrolysis of tobacco wastes for bio-oil with aroma compounds[J].Journal of Analytical and Applied Pyrolysis,2018,136:248-254.
-
[5]
GAO W H,CHEN K F,XIANG Z Y,et al.Kinetic study on pyrolysis of tobacco residues from the cigarette industry[J].Industrial Crops and Products,2013,44:152-157.
-
[6]
LIANG M,YANG T,ZHANG G,et al.Effects of hydrochloric acid washing on the structure and pyrolysis characteristics of tobacco stalk[J].Biomass Conversion and Biorefinery,2023,13(8):6817-6830.
-
[7]
LIAO S,ZHU L J,XU J,et al.Study on the effect of different solvent pretreatment on the pyrolysis characteristics of tobacco[J].Journal of Analytical and Applied Pyrolysis,2023,174:106142.
-
[8]
KONSOMBOON S,COMMANDRÉ J M,FUKUDA S.Torrefaction of various biomass feedstocks and its impact on the reduction of tar produced during pyrolysis[J].Energy & Fuels,2019,33(4):3257-3266.
-
[9]
陈勇,陈登宇,孙琰,等.烘焙脱氧预处理对生物质秸秆燃料品质的影响[J].科学技术与工程,2015,15(11):205-209.
-
[10]
张雨,徐佳佳,马中青,等.烘焙预处理对方竹热解产物特性的影响[J].浙江农林大学学报,2019,36(5):981-989.
-
[11]
-
[12]
SONG G H,XIAO J,ZHAO H,et al.A unified correlation for estimating specific chemical exergy of solid and liquid fuels[J].Energy,2012,40(1):164-173.
-
[13]
CHANNIWALA S A,PARIKH P P.A unified correlation for estimating HHV of solid,liquid and gaseous fuels[J].Fuel,2002,81(8):1051-1063.
-
[14]
FAN Y Y,LI L W,TIPPAYAWONG N,et al.Quantitative structure-reactivity relationships for pyrolysis and gasification of torrefied xylan[J].Energy,2019,188:116119.
-
[15]
CHEN X F,MA X Q,PENG X W,et al.Conversion of sweet potato waste to solid fuel via hydrothermal carbonization[J].Bioresource Technology,2018,249:900-907.
-
[16]
LIANG M,ZHANG K,LEI P,et al.Fuel properties and combustion kinetics of hydrochar derived from co-hydrothermal carbonization of tobacco residues and graphene oxide[J].Biomass Conversion and Biorefinery,2020,10(1):189-201.
-
[17]
MA Z Q,CHEN D Y,GU J,et al.Determination of pyrolysis characteristics and kinetics of palm kernel shell using TGA-FTIR and model-free integral methods[J].Energy Conversion and Management,2015,89:251-259.
-
[18]
CHEN C S,QU B Y,WANG W X,et al.Rice husk and rice straw torrefaction:Properties and pyrolysis kinetics of raw and torrefied biomass[J].Environmental Technology & Innovation,2021,24:101872.
-
[19]
MA Z Q,WANG J H,YANG Y Y,et al.Comparison of the thermal degradation behaviors and kinetics of palm oil waste under nitrogen and air atmosphere in TGA-FTIR with a complementary use of model-free and model-fitting approaches[J].Journal of Analytical and Applied Pyrolysis,2018,134:12-24.
-
[20]
程辉,余剑,姚梅琴,等.木质素慢速热解机理[J].化工学报,2013,64(5):1757-1765.
-
[21]
陈登宇,陈凡,岑珂慧,等.烘焙预处理对杉木成型燃料理化性质及热解特性的影响[J].能源研究与利用,2021(2):20-24.
-
[22]
XIN S Z,YANG H P,CHEN Y Q,et al.Assessment of pyrolysis polygeneration of biomass based on major components:Product characterization and elucidation of degradation pathways[J].Fuel,2013,113:266-273.
-
[23]
郭秀娟,王树荣,刘倩,等.不同烘焙条件对纤维素热裂解机理的影响研究[J].太阳能学报,2009,30(9):1246-1251.
-
[24]
CARDOSO C R,MIRANDA M R,SANTOS K G,et al.Determination of kinetic parameters and analytical pyrolysis of tobacco waste and Sorghum bagasse[J].Journal of Analytical and Applied Pyrolysis,2011,92(2):392-400.
-
[25]
YANG H P,YAN R,CHEN H P,et al.Characteristics of hemicellulose,cellulose and lignin pyrolysis[J].Fuel,2007,86(12/13):1781-1788.
-
[26]
CONESA J A,DOMENE A.Biomasses pyrolysis and combustion kinetics through n-th order parallel reactions[J].Thermochimica Acta,2011,523(1/2):176-181.
-
[27]
SAHU S G,SARKAR P,CHAKRABORTY N,et al.Thermogravimetric assessment of combustion characteristics of blends of a coal with different biomass chars[J].Fuel Processing Technology,2010,91(3):369-378.
-
[1]
-
点击查看大图
计量
- PDF下载量: 0
- 文章访问数: 9
- 引证文献数: 0
下载:
