Distribution of ignition temperature and ignition heat of power coal in China

doi:10.11949/j.issn.0438-1157.20141860

Abstract

Abstract:

In order to identify the function between the distribution pattern of steam coal content and ignition and stable combustion characteristics, a mathematical analyzing data test is made to 166 coal qualities used by pulverized-coal fired boiler of large power station in China. This research analyzed the distribution pattern of V_daf ratio between fixed carbon (C_gt) and equivalent gaseous carbon (C_qt 3.67H_ar), and its influence on the ignition and combustion characteristics. With the experimental data from one dimension sedimentation furnace of 77 coals collected from the literatures, the function of ignition temperature to V_ad and A_ad was simulated, and the distribution characteristics of ignition temperature and heat of different coal samples were calculated and analyzed. A new method for resolving images of ignition temperature and heat was introduced, which has been applied to analyze the characteristics of coal firing. The results showed that it can not only quantitatively distinguish the ignition characteristics among the same and different type of coals, but also give reasonable explanation of macroscopic law in theory.

Key words: coal combustion, fuel, thermal ignition, ignition temperature, ignition heat, model

摘要：

为了寻求动力煤成分分布与煤质着火及稳燃特性之间的函数关系,根据燃烧学的热力着火理论,对国内大型电站煤粉锅炉燃用的166个典型的煤质分析数据进行了数学分析。分析了固态碳(C_gt)和当量气态碳(C_qt 3.67H_ar)比值随V_daf的分布规律及其对煤质着火的影响;根据文献中77个煤质的一维沉降炉实验数据,拟合出煤粉的着火温度与V_ad及A_ad的函数关系,计算分析了本文大数据样本煤质的着火温度及着火热的分布规律,提出将着火热和着火温度作为煤质着火特性的图像分辨新方法。据此分析了各类煤质的着火与稳燃特性。结果表明,本方法能明确地定量区分不同类煤质和同类煤质的着火特性差异,且在理论上给出符合宏观规律的合理解释。

关键词: 煤燃烧, 燃料, 热力着火, 着火温度, 着火热, 模型

CLC Number:

TK224

FAN Jinyuan, CHEN Hongwei. Distribution of ignition temperature and ignition heat of power coal in China[J]. CIESC Journal, 2015, 66(10): 4170-4176.

樊晋元, 陈鸿伟. 中国动力煤的着火温度与着火热的分布规律[J]. 化工学报, 2015, 66(10): 4170-4176.

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