煤焦比热容的模型与DSC实验研究  

EXPERIMENTAL STUDY OF SPECIFIC HEAT MODELS OF COAL-CHARS BY APPLYING DSC

作　　者：陈珣[1] 傅培舫[1] 周怀春[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《工程热物理学报》2010年第1期169-172,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.50576025);国家自然科学基金资助项目(No.50721005)

摘　　要：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。Three kinds of raw coals are selected,and five kinds of coal-char samples are obtained in a Drop Tube Furnace（DTF）.The values of their specific heat in the range of 70～500℃are determined by applying DSC,and are compared with the values calculated by the classic theoretical models. Below 500℃,the values of specific heat of char samples monotonically increase from around 0.9 kJ/（kg·K） to 1.4～1.7 kJ/（kg·K） with the same trend of the theoretical data that is slightly smaller. The values of specific heat of chars prepared at 1100℃are all higher than that of chars prepared at 1300℃.The volatile content V_（daf） of raw coals influences the difference in the values of specific heat between chars prepared at different temperature levels.

关 键 词：煤焦 比热容 DSC 模型 

分 类 号：TK16[动力工程及工程热物理—热能工程]