摘要
煤的比热容是热力工作中重要的基础参数,但到目前为止,比热容的获取尚未形成较系统的方法,大部分是根据经验公式和数学模型计算而得。本文就目前已有的各种实测方法和数学模型及其特点进行概述归纳。通过文献调研得知:对于实测方法,比较适用的有水卡计法和差示扫描法,其中水卡计法测试的温度范围较窄,一般在200℃以下;差示扫描法测试温度范围较广能达到1 000℃以上,但受测试条件的影响较大。对于数学模型,比较通用的有Kirov模型和Merrick模型,其中Merrick模型应用更广泛,在400℃以下模拟的较准确,在1 000℃以上与实测值偏差较大。因此,建议在较低温范围内,可通过数学模型和水卡计等方法获取煤的比热容;而在较高温度情况下,可采用差示扫描等方法进行实测获得。
The specific heat capacity of coal was an important basic parameter of thermodynamic engineering.Nevertheless,more systematic approach was not formed,and most of the values were calculated through empirical equations and mathematic models. Kinds of measuring methods and models mainly summarized and analyzed. Through literature research, both water calorimeter and DSC（ differential scanning calorimeter） were widely used, water calorimeter only used under 200 ℃ and DSC much influenced with testing conditions could be used up to 1 000 ℃. To mathematical model,Kirov model and Merrick model were quoted by most of literatures. Merrick model had a higher accuracy under 400 ℃,but also had a serious deviation above 1 000 ℃. Therefore,under a lower temperature,mathematical model and water calorimeter would be better. At relatively higher temperature,DSC and other advanced methods would be more useful.
出处
《广州化工》
CAS
2014年第21期56-58,共3页
GuangZhou Chemical Industry
关键词
煤
比热容
实测方法
数学模型
coal
specific heat capacity
measuring method
mathematical model
