煤的原位瓦斯放散初速度测定装置及方法研究

薛伟超

doi:10.13272/j.issn.1671-251x.2023100059

煤的原位瓦斯放散初速度测定装置及方法研究

doi: 10.13272/j.issn.1671-251x.2023100059

薛伟超^{1, 2,}

1.
中国矿业大学矿业工程学院，江苏徐州　221116
2.
中煤科工集团沈阳研究院有限公司，辽宁抚顺　113122

基金项目: 辽宁省自然科学基金资助项目（2022-MS-463）。

详细信息

作者简介:
薛伟超（1988— ），男，河南沁阳人，副研究员，博士研究生，主要从事煤岩动力灾害防治工作，E-mail：xinshijixue@163.com

中图分类号: TD712
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出版历程
- 收稿日期: 2023-10-19
- 修回日期: 2024-04-19
- 网络出版日期: 2024-05-10

Research on the device and method for measuring the initial velocity of in-situ gas emission from coal

XUE Weichao^{1, 2
,}

1.
School of Mines, China University of Mining and Technology, Xuzhou 221116, China
2.
CCTEG Shenyang Research Institute, Fushun 113122, China

摘要

摘要: 瓦斯放散初速度是鉴定煤与瓦斯突出危险性的重要指标之一。现有研究未将煤的瓦斯放散初速度指标测试与突出鉴定的其他3个指标（煤层瓦斯压力、煤的破坏类型、煤的坚固性系数）的测试有机结合。现行瓦斯放散初速度测定方法基于AQ 1080—2009《煤的瓦斯放散初速度指标（∆p）测定方法》，测定结果仅反映标准实验条件下瓦斯通过煤粒子向外释放的难易程度，未考虑煤层瓦斯赋存的原位环境，无法准确反映现场煤岩体内部瓦斯向外释放的灾害严重程度。针对上述问题，提出了一种原位瓦斯放散初速度测定装置及方法：采用原始煤块代替煤颗粒，用原始瓦斯成分代替甲烷，增加煤体所处瓦斯压力、应力、温度环境，还原测定的原位环境。对某煤矿煤与瓦斯突出煤层进行原位瓦斯放散初速度测定试验，得出结论：① 随着模拟瓦斯放散过程的进行，瓦斯放散流量逐渐减小，随时间大致呈负指数变化规律。用瓦斯流量表征原位瓦斯放散初速度，则Δp_QA=7.1 mmHg，Δp_QI=2.9 mmHg。② 随着模拟放散过程的进行，放散空间内的瓦斯压力逐渐增大，放散瓦斯压力增大速度逐渐减小，瓦斯压力随时间变化大致呈对数函数关系。用放散瓦斯压力表征原位瓦斯放散初速度，则Δp_PA=25 mmHg，Δp_PI=26.6 mmHg，Δp_PD=11 mmHg。测定结果可综合反映煤层赋存的双重孔隙结构、煤体的力学特性、煤体内瓦斯的赋存能量、煤层赋存的地应力和温度等原位环境，真实反映煤矿井下发生突出危险性程度。
- 煤与瓦斯突出 /
- 突出危险性鉴定 /
- 瓦斯放散初速度 /
- 原位环境 /
- 放散瓦斯压力 /
- 放散瓦斯流量
Abstract: The initial velocity of gas emission is one of the important indicators for identifying the risk of coal and gas outburst. The existing research has not organically combined the testing of the initial gas emission rate index of coal with the testing of the other three indicators for outburst identification (coal seam gas pressure, coal failure type, and coal solidity coefficient). The current method for measuring the initial velocity of gas emission is based on AQ 1080-2009 "Method for Measuring the Initial Velocity Index (∆p) of Coal Gas Emission". The measurement results only reflect the difficulty of gas emission through coal particles under standard experimental conditions, without considering the in-situ environment of coal seam gas occurrence. The results cannot accurately reflect the severity of the disaster of gas emission inside the coal rock mass on site. In order to solve the above problems, the device and method for measuring the initial velocity of in-situ gas emission are proposed. The method replaces coal particles with original coal blocks, replaces methane with original gas components, increases the gas pressure, stress, and temperature environment in which the coal body is located. The method restores the in-situ environment for measurement. A in-situ gas emission initial velocity measurement experiment is conducted by use of coal samples from coal and gas outburst coal seams in a certain coal mine. The conclusions are listed as follows. ① With the simulation of gas emission process, the gas emission flow rate gradually decreases and shows a negative exponential change law with time. The gas flow rate is used to characterize the initial velocity of in-situ gas emission, then Δp_QA=7.1 mmHg, Δp_QI=2.9 mmHg. ② As the simulation of the gas emission process progresses, the gas pressure in the emission space gradually increases, and the rate of gas pressure increase gradually decreases. The gas pressure changes roughly with time in a logarithmic function relationship. The emission gas pressure is used to characterize the initial velocity of in-situ gas emission, then Δp_PA=25 mmHg, Δp_PI=26.6 mmHg, Δp_PD=11 mmHg. The measurement results can comprehensively reflect the dual pore structure of coal seams, the mechanical properties of coal bodies, the energy of gas occurrence in coal bodies, the in-situ environment of stress and temperature in coal seams, and truly reflect the degree of outburst danger in coal mines underground.
- coal and gas outburst /
- outburst danger identification /
- initial velocity of gas emission /
- in situ environment /
- emission gas pressure /
- emission gas flow rate

HTML全文

图 1 煤的原位瓦斯放散初速度测定装置组成

1−阀门1；2−阀门2；3−阀门3；4−阀门4；5−流量传感器1；6−流量传感器2；7−流量传感器3；8−流量传感器4；9−储气容器1；10−储气容器2；11−储气容器3；12−储气容器4；13−压力传感器1；14−增压泵；15−气体混合室；16−温度传感器1；17−温度控制器；18−阀门5；19−应力加载机；20−原位煤样或型煤；21−原位环境室；22−阀门6；23−阀门7；24−真空泵；25−管路；26−阀门8；27−放散空间；28−压力传感器2；29−阀门9；30−流量传感器5；31−原位环境模拟模块；32−抽真空模块；33−瓦斯放散模块；34−原位瓦斯气体制备模块；35−压力传感器3；36−放气口；37−阀门10；38−温度传感器2。

Figure 1. Composition of the initial velocity measurement device for in-situ gas emission from coal

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图 2 PLC控制模块

Figure 2. PLC control module

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图 3 本文方法测定的原位瓦斯放散流量曲线

Figure 3. In-situ gas emission flow curve measured by the method in the paper

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图 4 现行方法测定的瓦斯放散流量曲线

Figure 4. Gas emission flow curve measured by existing method

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图 5 瓦斯放散量随时间变化曲线

Figure 5. Variation curve of gas emission volume with time

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图 6 本文方法测定的原位瓦斯放散压力曲线

Figure 6. In-situ gas emission pressure curve meaused by the method in the paper

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