Isotope radon measurement method to identify spontaneous combustion regions in coal gangue hills: case study for a coal mine in China

Wu, Songtai; Zhou, Bin; Wang, Junfeng; Yang, Qifan; Dong, Wen-Zhe; Dong, Zhiyu

doi:10.1080/19392699.2023.2199453

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…The on-site measurement results demonstrate that the isotopic radon measurement method can be adopted to detect coal gangue fire areas more accurately with less interference. 28 Wang et al used the temperature and the radon concentration as the principal indicators, and the gas concentration was a secondary index for verifying the results to estimate the extent and depth of the fire in the coal gangue dumps. 13,29 The main fire extinguishing methods for spontaneous combustion of coal gangue dumps include the excavation and cooling method, the grouting method, the overlay compaction method, the combustion control method, the low-temperature inert gas method, the water injection method, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Wu et al carried out an oxidation heating experiment on coal gangue samples and analyzed the law of radon release in the coal gangue at different temperatures. The on-site measurement results demonstrate that the isotopic radon measurement method can be adopted to detect coal gangue fire areas more accurately with less interference . Wang et al used the temperature and the radon concentration as the principal indicators, and the gas concentration was a secondary index for verifying the results to estimate the extent and depth of the fire in the coal gangue dumps. , …”

Section: Introductionmentioning

confidence: 99%

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Detection of Spontaneous Combustion Areas of Coal Gangue Dumps and Comprehensive Governance Technologies: A Case Study

Liu,

Qi,

Luo

et al. 2023

ACS Omega

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Spontaneous combustion of coal gangue dumps not only releases toxic and harmful gases, polluting the environment, but also leads to explosion accidents and casualties due to improper handling. This paper focuses on delineating the fire area, constructing a comprehensive fire prevention and extinguishing system, and restoring the ecological environment. Infrared thermal imaging was used to detect the shallow fire area, while intensive drilling was conducted to detect the deep fire area. The stability of the coal gangue dump was enhanced by perfusing three-phase foam for cooling and using a curing material to fill the cracks. Land reclamation was then performed to restore the ecological environment. The results indicate that spontaneous combustion of coal gangue dumps can trigger the spread of the fire area from the outside to the inside, gradually expanding due to the ‘stack effect’. The sources of spontaneous combustion in gangue fire areas are mainly located 3–5 m below the flat surface, and the shallow and deep fire areas are interconnected, posing a significant danger. These research findings can serve as a reference for detecting fire areas in coal gangue dumps and controlling environmental pollution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detection of Spontaneous Combustion Areas of Coal Gangue Dumps and Comprehensive Governance Technologies: A Case Study

Liu,

Qi,

Luo

et al. 2023

ACS Omega

View full text Add to dashboard Cite

show abstract

“…Most notably, the probe and cable are easily damaged, and it is not suitable to use it on a large scale [25]. A characteristic of methods such as isotope radon measurement [26] and magnetic and infrared induction [27,28] is that they cannot achieve directly contact in high-temperature locations, which leads the positioning and value of temperature anomaly points to be inaccurate. The radio wave detection method has high accuracy and low cost, but the transmission technology used in gob still needs further improvement [29].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Monitoring of Coal Spontaneous Combustion Degree Using a Distributed Fiber Optic Temperature Measurement System: Field Application and Evaluation

Zhang,

Han,

Qin

et al. 2023

Fire

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Coal spontaneous combustion (CSC) in gob not only leads to wasted resources and casualties, but also produces a lot of waste gas that pollutes the underground environment. Mastering the degree of CSC helps ensure that timely and effective control measures are taken. The real-time and accurate monitoring of temperature, as the primary indicator of the extent of CSC, is difficult due to the harsh and hidden environment of gob, resulting in a reduced ability to anticipate and prevent CSC. In this work, a complete distributed optical fiber temperature sensing system (DTSS) set with strong anti-damage ability was developed. The optical cable is protected by internal parallel steel cables and external protective pipes, which greatly improve the system’s reliability and integrity when used in gob. During its application in the Wangyun Coal Mine, an abnormal temperature rise in gob was discovered in time, and the effect of inhibitor spraying was monitored and evaluated. The degree of CSC in the gob was accurately identified, which shows that the work of coal mining can be targeted. This work is expected to improve early warning capability to prevent the risk of CSC in gob, and has promising applications.

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“…The remaining coal inside these hills can release a substantial amount of heat through slow atmospheric oxidation, resulting in high temperatures within the gangue hills. The internal temperatures can range from 573 K to 1473 K, while the surface temperatures can exceed 373 K [6,[11][12][13][14][15], which severely impacts vegetation growth and has the potential to lead to disasters such as explosions [16][17][18][19]. Therefore, it is urgent to address the problem of effective treatment methods for coal gangue hills.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Parameters for Gravity Heat Pipes in Coal Gangue Hills by Measuring Thermal Power Generation

Zhang,

et al. 2023

Processes

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In order to effectively control high temperatures inside coal gangue hills, gravity heat pipes with specific spacings are vertically installed in coal gangue hills. Heat extracted from these heat pipes can be utilized for power generation through energy conversion. In this study, an equivalent model of gravity heat pipes in coal gangue hills was established and, in a laboratory setting, experimental research and optimization were conducted on power generation per unit area using the temperature difference of gravity heat pipes for electricity generation. To facilitate real-time testing of different heat pipe parameters and to display the experimental results, a multi-parameter measurement system was designed and constructed. This study systematically investigated the effects of various structural parameters such as inclination angle, heating temperature, initial absolute pressure, and working fluid height. Through single-factor experiments, it was determined that the inclination angle had no significant impact. The range of values for heating temperature, initial absolute pressure, and working fluid height were confirmed based on six sets of experiments. To maximize the performance of the thermoelectric generator, a response surface analysis experiment was conducted using the Design-Expert software. The optimal conditions were determined to be a working fluid height of 200.001 mm, an initial absolute pressure of 0.002 MPa, and a heating temperature of 413.15 K. Under these conditions, the power generation per unit area of the thermoelectric generator reached 0.122981 W/(m2·K). The accuracy of the theoretical experiments was verified through on-site industrial experiments. By calculations, it was determined that the maximum temperature difference power generation capacity per gravity heat pipe was 42.39 W. This provides a new solution for the management of coal mine gangue hills and the secondary utilization of waste energy.

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Isotope radon measurement method to identify spontaneous combustion regions in coal gangue hills: case study for a coal mine in China

Cited by 7 publications

References 16 publications

Detection of Spontaneous Combustion Areas of Coal Gangue Dumps and Comprehensive Governance Technologies: A Case Study

Detection of Spontaneous Combustion Areas of Coal Gangue Dumps and Comprehensive Governance Technologies: A Case Study

Optimization of the Monitoring of Coal Spontaneous Combustion Degree Using a Distributed Fiber Optic Temperature Measurement System: Field Application and Evaluation

Optimization of the Parameters for Gravity Heat Pipes in Coal Gangue Hills by Measuring Thermal Power Generation

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