Ignition temperature of anthracite coal in O<sub>2</sub>/CO<sub>2</sub> atmospheres:experimental study and modeling prediction

GU Guangjin; ZHOU Yuegui; JIN Xudong; XU Yangyang

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Ignition temperature of anthracite coal in O₂/CO₂ atmospheres:experimental study and modeling prediction

Thermal Power Generation Vol. 43, Issue 1, Pages: 31-35(2014)

更新时间：2025-09-28

- Ignition temperature of anthracite coal in O₂/CO₂ atmospheres:experimental study and modeling prediction
- 作者机构：
  
  上海交通大学机械与动力工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK16
- Published：2014
- 稿件说明：
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GU Guangjin, ZHOU Yuegui, JIN Xudong, et al. Ignition temperature of anthracite coal in O₂/CO₂ atmospheres:experimental study and modeling prediction[J]. Thermal Power Generation, 2014, 43(1): 31-35.
DOI：

GU Guangjin, ZHOU Yuegui, JIN Xudong, et al. Ignition temperature of anthracite coal in O₂/CO₂ atmospheres:experimental study and modeling prediction[J]. Thermal Power Generation, 2014, 43(1): 31-35. DOI：

摘要

为了研究O2/CO2气氛下无烟煤的着火特性尤其是着火温度Ti

采用垂直沉降炉(DTF)实测了阳泉无烟煤在空气(21%O2/79%N2)气氛及4种不同O2浓度(10%、21%、30%、40%)的O2/CO2气氛下着火时的气体温度Ti

并采用改进的非均相热力着火模型对该无烟煤着火时的气体温度Ti

g和颗粒温度Ti

p进行了预报与比较。研究结果表明:在相同O2浓度时

O2/CO2气氛下阳泉无烟煤的着火温度明显高于O2/N2气氛下的着火温度

这主要是因为CO2比N2有更高的摩尔比热容以及O2在CO2中的质量扩散率比在N2中更低;在O2/CO2气氛中阳泉无烟煤的着火温度随着O2浓度的增加而呈指数形式降低;各气氛下煤粉着火时的气体温度预报值与实测值吻合较好。

Abstract

In order to determine the ignition characteristics especially the ignition temperature of an anthracite coal in O2 /CO2 atmospheres

the ignition gas temperature of Yangquan anthracite coal was measured in air(21%O2 /79%N2)atmosphere and O2 /CO2 atmospheres with O2 volumetric concentration of 10%

21%

30%and 40%in a drop tube furnace.Then the improved heterogeneous thermal explosion model was applied to predict the ignition temperatures of gas and coal particles

and they were compared with the experimental results.The results show that

the ignition temperature of Yangquan anthracite coal in O2 /CO2 atmosphere is significantly higher than that in O2 /N2 atmosphere with the same oxygen concentration.This is due to the high molar specific heat of CO2 and the lower mass diffusivity of O2 in CO2

compared with that of N2.Moreover

the ignition temperature of Yangquan anthracite coal exponentially decreases with the increase of oxygen concentration in O2 /CO2 atmospheres.The predicted ignition gas temperatures agreed well with experimental ones in all atmospheres.

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Ignition temperature of anthracite coal in O2/CO2 atmospheres:experimental study and modeling prediction

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Ignition temperature of anthracite coal in O₂/CO₂ atmospheres:experimental study and modeling prediction