燃料化学学报
燃料化學學報
연료화학학보
JOURNAL OF FUEL CHEMISTRY AND TECHNOLOGY
2014年
9期
1040-1046
,共7页
陈群%庞任重%陈熙%杨锐明%禚玉群%陈昌和
陳群%龐任重%陳熙%楊銳明%禚玉群%陳昌和
진군%방임중%진희%양예명%작옥군%진창화
生物质%热解%焦炭%比热容%热分析
生物質%熱解%焦炭%比熱容%熱分析
생물질%열해%초탄%비열용%열분석
b iomsa s%primary pyrolysis%biochar%specific heat capacity%TG-DSC
采用热重-差示量热扫描法( TG-DSC)测量了生物质和一次热解焦炭及不同转化率下半焦的比热容,建立了计算半焦比热容的数学模型并与实验测量结果进行了对比。结果表明,生物质样品和热解焦炭的比热容在60~200℃随温度升高而线性增大。生物质焦炭的比热容低于生物质样品的比热容,从60℃时的1.2 J/(g· K)增大到200℃附近的1.8~2.0 J/(g· K)。生物质半焦比热容随热解转化率的提高而降低。由半焦比热容数学模型计算得到的结果在接近150~200℃时与实验测定的半焦比热容数值基本一致。
採用熱重-差示量熱掃描法( TG-DSC)測量瞭生物質和一次熱解焦炭及不同轉化率下半焦的比熱容,建立瞭計算半焦比熱容的數學模型併與實驗測量結果進行瞭對比。結果錶明,生物質樣品和熱解焦炭的比熱容在60~200℃隨溫度升高而線性增大。生物質焦炭的比熱容低于生物質樣品的比熱容,從60℃時的1.2 J/(g· K)增大到200℃附近的1.8~2.0 J/(g· K)。生物質半焦比熱容隨熱解轉化率的提高而降低。由半焦比熱容數學模型計算得到的結果在接近150~200℃時與實驗測定的半焦比熱容數值基本一緻。
채용열중-차시량열소묘법( TG-DSC)측량료생물질화일차열해초탄급불동전화솔하반초적비열용,건립료계산반초비열용적수학모형병여실험측량결과진행료대비。결과표명,생물질양품화열해초탄적비열용재60~200℃수온도승고이선성증대。생물질초탄적비열용저우생물질양품적비열용,종60℃시적1.2 J/(g· K)증대도200℃부근적1.8~2.0 J/(g· K)。생물질반초비열용수열해전화솔적제고이강저。유반초비열용수학모형계산득도적결과재접근150~200℃시여실험측정적반초비열용수치기본일치。
The specific heat capacities of chars during primary pyrolysis of biomass with different conversion and the heat capacities of virgin biomass were determined.The ratio method was employed to measure the specific heat capacities of two biomass samples and their pyrolyzed chars through thermogravimetry and differential scanning calorimetry ( TG-DSC).A mathematical model was developed to calculate values of specific heat of chars.The results show that the specific heat capacitei s of the two biomass samples and their derived chars increase linearly within 60~200℃.The values oft he specific heat capacity fo the chars are lower than those fo the virgin biomass samples.The specific heat of chars decreases as the extent of pyrolysis increases.The calculated specific heat capacities from the developed mathematical model are quite close to those me asured by TG-DSC analyses eb twe n 150~200℃.