A model for assessing the compound risk represented by spontaneous coal combustion and methane emission in a gob

Xu, Yu; Liu, Huasen; Zhai, Xiaowei; Li, Rongrong; Song, Pinfang; Jia, Mintao

doi:10.1016/j.jclepro.2020.122925

Cited by 51 publications

(14 citation statements)

References 27 publications

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“…The original temperature of the surrounding rock and air in the roadway is 45 • C, and the advance rate of the working face is 0.2 m/h. The main parameters of the model are set in Table 1, which are substituted from the contemporary literature [42,43].…”

Section: Methodsmentioning

confidence: 99%

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Numerical Analysis on the Thermal Performance in an Excavating Roadway with Auxiliary Ventilation System

Liu

et al. 2021

IJERPH

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A steady and proper thermal environment in deep underground is imperative to ensure worker health and production safety. Understanding the thermal performance in the roadway is the premise of temperature prediction; ventilation design; and improvement in cooling efficiency. A full coupled model incorporated with a moving mesh method was adopted; reflecting the dynamic condition of roadway construction. This study revealed the characteristics of the thermal performance and its evolution law in an excavating roadway. Several scenarios were performed to examine the designs of the auxiliary ventilation system on thermal performance in the roadway. The results show that there is a limitation in the cooling effect by continuously increasing the ventilation volume. Reducing the diameter of the air duct or distances between the duct outlet and the working face will aggravate the heat hazard in the roadway. The heat release from the roadway wall increases with the increase of the advance rate of the working face or roadway section size. Furthermore; an orthogonal experiment was conducted to investigate the effect of major factors on the average air temperature and local heat accumulation in the roadway

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Section: Methodsmentioning

confidence: 99%

“…The o ature of the surrounding rock and air in the roadway is 45 °C, and the adv working face is 0.2 m/h. The main parameters of the model are set in Ta substituted from the contemporary literature [42,43]. A moving mesh method is incorporated into the mathematical model to perform the dynamic excavation of the roadway.…”

Section: Methodsmentioning

confidence: 99%

Numerical Analysis on the Thermal Performance in an Excavating Roadway with Auxiliary Ventilation System

Liu

et al. 2021

IJERPH

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“…According to the theory of heat transfer, the differential equations of heat transfer process between the same object or different objects can be summarized [27][28][29]. Combined with the second law of thermodynamics, it can be known that the temperature difference is the reason of heat transfer from high temperature to low temperature, and the heat transfer modes are heat conduction, heat convection, and heat radiation, respectively.…”

Section: Governing Equationsmentioning

confidence: 99%

Numerical Analysis of the Spontaneous Combustion Accidents of Oil Storage Tanks Containing Sulfur

Cai

2021

Processes

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In order to study various influencing factors of spontaneous combustion accidents of sulfur-containing oil storage tanks, this paper constructed a two-dimensional model of the storage tank wall by COMSOL Multiphysics software. The proposed model takes temperature change trend as an observation index to explore the heat transfer process of the tank wall. By fitting the function curve of heat release with oxidation reaction temperature of sulfur corrosion products and comparing with constant heat sources, it is found that heat source intensity will affect the temperature growth trend of tank spontaneous combustion. In addition, the air convection heat transfer coefficient represents the interference degree of external environment to the spontaneous combustion heating process, and the wall heating rate decreases with the increase of air convection heat transfer coefficient. The different heat release rates in varying oxidation stages will lead to distinct temperature growth trends. The larger the air convection heat transfer coefficient, the greater the temperature difference between the inner and outer walls of the tank, which is not conducive to the detection of the abnormal temperature of the heat source. The difference of thermal insulation and thermal conductivity of tank materials also affects the wall heat transfer, so the material properties should be considered comprehensively in actual production. The research results can provide a research basis and a theoretical basis for monitoring, prevention, and control of spontaneous combustion of sour oil storage tanks.

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“…Since spontaneous combustion of coal can lead to the ignition of methane, this subject has also been presented in several interesting and valuable works [85][86][87].…”

Section: Brief Literature Review Of Ventilation Of Longwalls and Methane And Coal Spontaneous Combustion Hazardsmentioning

confidence: 99%

The Impact of the Ventilation System on the Methane Release Hazard and Spontaneous Combustion of Coal in the Area of Exploitation—A Case Study

et al. 2020

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Various types of natural hazards are inextricably linked to the process of underground hard coal mining. Ventilation hazards—methane and spontaneous combustion of coal—are the most dangerous; they pose a major threat to the safety of the workers and decrease the effectiveness of the whole coal production process. One of the methods designed to limit the consequences of such hazards is based on the selection of a ventilation system that will be suitable for the given mining area. The article presents a case study of an active longwall area, where—due to increasing ventilation hazard (methane and spontaneous combusting of coal)—the whole system was rebuilt. The U-type ventilation system was used in the initial stage of the extraction process, however, it often generated methane in amounts that exceeded the allowable values. Consequently, such conditions forced the change of the ventilation system from a U–type to Y–type system. The new system was installed during the ongoing mining process, unlike the usual practice. The article presents the results of tests on mine gas concentrations and descriptive statistics for both types of ventilation system. The results clearly demonstrate that the U-type longwall ventilation system, in the case of high methane release hazard, prevents safe and effective operation. At the same time, the use of this system limits the carbon oxidation reactions in the goaf, leading to spontaneous heating and combustion, which is confirmed by the low concentrations of gases—by-products of these reactions. In turn, the use of the Y-type longwall ventilation system ensures safe and effective operation in areas with high methane release hazard, but at the same time deteriorates the safety associated with the spontaneous combusting of coal. The presented case—both from a scientific and practical perspective—is quite interesting and greatly broadens the knowledge in the scope of an efficient ventilation system for underground workings.

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A model for assessing the compound risk represented by spontaneous coal combustion and methane emission in a gob

Cited by 51 publications

References 27 publications

Numerical Analysis on the Thermal Performance in an Excavating Roadway with Auxiliary Ventilation System

Numerical Analysis on the Thermal Performance in an Excavating Roadway with Auxiliary Ventilation System

Numerical Analysis of the Spontaneous Combustion Accidents of Oil Storage Tanks Containing Sulfur

The Impact of the Ventilation System on the Methane Release Hazard and Spontaneous Combustion of Coal in the Area of Exploitation—A Case Study

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