煤尘层最低着火温度变化规律实验研究

刘天奇; 李雨成; 罗红波

doi:10.11858/gywlxb.20170649

煤尘层最低着火温度变化规律实验研究

doi: 10.11858/gywlxb.20170649

刘天奇^{1, 2, 3,},
李雨成^{1, 2, 3},
罗红波^{1, 2, 3}

1.
辽宁工程技术大学安全科学与工程学院, 辽宁阜新 123000
2.
辽宁工程技术大学矿山热动力灾害与防治教育部重点实验室, 辽宁阜新 123000
3.
辽宁工程技术大学煤炭资源安全开采与洁净利用工程研究中心, 辽宁阜新 123000

基金项目:

国家自然科学基金 51774168

国家自然科学基金 51204089

辽宁省自然科学基金 201602355

辽宁省教育厅项目 LJYL002

辽宁省教育厅项目 551610001276

详细信息

作者简介:
刘天奇(1990-), 男, 博士研究生, 主要从事矿井通风与粉尘放置理论及技术研究.E-mail:ltq613@163.com

中图分类号: X932
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出版历程
- 收稿日期: 2017-09-27
- 修回日期: 2017-10-30

Variation Law for Minimum Ignition Temperature of Coal Dust Layer

LIU Tianqi^{1, 2, 3
,},
LI Yucheng^{1, 2, 3},
LUO Hongbo^{1, 2, 3}

1.
College of Safety Science and Engineering, Liaoning Technical University, Fuxin 123000, China
2.
Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education, Liaoning Technical University, Fuxin 123000, China
3.
Research Center of Coal Resources Safe Mining and Clean Utilization, Liaoning Technical University, Fuxin 123000, China

摘要

摘要: 为研究煤尘层最低着火温度随煤样变质程度、煤尘粒径及煤尘层厚度的变化规律，采用煤尘层最低着火温度测定系统进行实验研究，结果表明：随着煤样由褐煤到无烟煤变质程度逐渐增大，煤尘层最低着火温度由290℃上升到400℃以上，同时，褐煤、长焰煤、不粘煤、气煤煤尘层着火时观察到明显的火焰。随着煤尘粒径不断减小，不同煤质的煤尘层最低着火温度明显减小，煤尘层厚度为15 mm时，随着煤尘粒径由0.5 mm减小至0.075 mm，不同煤质煤尘层最低着火温度分别减小了31.0%、26.7%、28.1%、25.8%、28.6%、27.8%、18.9%和15.0%，煤尘粒径影响作用十分显著。随着煤尘层厚度的增大，不同煤质在不同粒径下的煤尘层最低着火温度都减小，其中无烟煤的变化最不明显。
- 煤尘层厚度 /
- 着火温度 /
- 变化规律 /
- 煤尘粒径
Abstract: In this paper we studied the variation of the minimum ignition temperature of coal dust layer with its metamorphism, particle size and thickness using the minimum ignition temperature measurement system.The results showed that, with the gradual increase of its degree of metamorphism, the minimum ignition temperature of coal dust layer varied from 290℃ to above 400℃; and that when the coal dust layer of lignite, long flame coal, non-stick coal, gas coal were ignited, an obvious flame was observed; and that, as the coal dust particle size decreased, the minimum ignition temperature of different kinds of the coal dust layer exhibited a significant reduction trend.It was found that when the thickness of the layer is 15 mm, with the particle size decreasing from 0.5 mm to 0.075 mm, the minimum ignition temperature decreased by 31.0%, 26.7%, 28.1%, 25.8%, 28.6%, 27.8%, 18.9% and 15.0%, respectively, indicating a very obvious effect of the coal dust particle size.With the increase of the layer's thickness, the minimum ignition temperature of different kinds of the coal dust layer exhibited a decreasing trend, while the trend of anthracite was the least significant.
- thickness of coal dust layer /
- ignition temperature /
- change law /
- coal dust particle size

HTML全文

图 1 煤尘层最低着火温度测定装置

Figure 1. Coal dust layer MIT tester

下载: 全尺寸图片幻灯片

图 2 煤尘层最低着火温度测定装置结构

Figure 2. Structure of coal dust layer MIT tester

1.Thermocouple height adjustment knob; 2.Spring; 3.Heater base; 4.Recording thermocouple on hot plate surface; 5.Hot plate surface; 6.Heater; 7.Metal ring; 8.Control thermocouple on hot plate surface; 9.Dust layer thermocouple; 10.Heater leads

下载: 全尺寸图片幻灯片

图 3 热板表面上煤尘层着火的典型温度-时间曲线

Figure 3. T-t curve of coal dust layer on hot surface

下载: 全尺寸图片幻灯片

图 4 煤尘层温度-时间曲线

Figure 4. T-t curve of coal dust layer

下载: 全尺寸图片幻灯片

图 5 煤尘层最低着火温度与粒径关系

Figure 5. T_L-r curve of coal dust layer

下载: 全尺寸图片幻灯片

表 1 8种煤质的煤尘层最低着火温度

Table 1. Coal dust layer MIT of 8 kinds of coal quality

No.	Coal quality	Particle size/mm	Thickness/mm	Minimum ignition temperature/℃	Ignition type	Ignition time/min
1	Lignite	0.2	5	290	a	18
2	Long flame coal	0.2	5	310	a	22
3	Not sticky coal	0.2	5	330	a	18
4	Gas coal	0.2	5	320	a	20
5	Coking coal	0.2	5	340	c	11
6	Lean coal	0.2	5	360	c	9
7	Meagre coal	0.2	5	370	c	13
8	Anthracite	0.2	5	>400	No fire	>30

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