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本文选取三个煤样,在滴管炉(DTF)上制取了五种焦样,应用差示扫描量热(DSC)法对其在70～500℃的比热容进行了测定,并与根据经典煤焦比热模型计算得到的数值进行了比较。实验煤焦比热容的实验值与计算值都随温度升高单调增加,从70℃的0.9 kJ/(kg·K)左右增大到500℃时的1.4～1.7 kJ/(kg·K)左右,一般实验值要略大于理论值。1100℃下的焦样,比热容均比1300℃下的焦样要大,且原煤中挥发分含量V_(daf)越高,对应的两个热解温度水平下的焦样的比热值相差越大。
In this paper, three coal samples were selected and five coke samples were prepared on a dropper (DTF). The specific heat capacity at 70 ~ 500 ℃ was measured by differential scanning calorimetry (DSC) The calculated values of the specific heat model of coal char were compared. The experimental values and calculated values of specific heat capacity of coal char increased monotonically with increasing temperature, increasing from about 0.9 kJ / (kg · K) at 70 ℃ to about 1.4 ~ 1.7 kJ / (kg · K) at 500 ℃. The general experimental value is slightly larger than the theoretical value. The coke samples at 1100 ℃ had higher specific heat capacities than the coke samples at 1300 ℃, and the higher the volatile content V daa in the coal, the more the specific heat values of the coke samples at the two pyrolysis temperature levels were different Big.