Underground coal fire emission of spontaneous combustion, Sandaoba coalfield in Xinjiang, China: Investigation and analysis

Deng, Jinchang; Ge, Shaokun; Han, Qing; Zhou, Fang; Shi, Bobo

doi:10.1016/j.scitotenv.2021.146080

Cited by 42 publications

(10 citation statements)

References 34 publications

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“…The composition of emissions (gasses, particles) depends principally on the following factors: (a) composition, morphology, and microstructure of the coal (or any other biomass) (Li, Wang, et al., 2020; Lighty et al., 2000); (b) intrinsic thermophysical properties, such as density of hot spots, temperature, and temperature gradients (Deng et al., 2021; Fletcher et al., 1997; Hashimoto & Hayashi, 2021; Lighty et al., 2000); (c) thermal forces created by air density and temperature differences, which control the flux of oxygen and moisture toward the composition zone (Dindarloo et al., 2015; Ribeiro et al., 2016); (d) distance between the combustion zone and vents (O'Keefe et al., 2011); and (e) the presence of volatile elements such as N, Hg, and S (which depends on the composition of the coal, host rock, and temperature) (O'Keefe et al., 2010; Zhang et al., 2013).…”

Section: Principal Factors Controlling the Emissions Of Coal Firesmentioning

confidence: 99%

“…This type of sampling was recently conducted by Deng et al. (2021), who measured the concentration of the solid components within the gas emissions but did not characterize the mineralogical and chemical features of the individual particles. Filters for collecting NPs from coal fires should consist of binder‐free borosilicate glass microfibers.…”

Section: Recommendations For Improving the Research On Nps Associated...mentioning

confidence: 99%

“…In addition to these instruments, NPs emitted by coal fires may be also collected through the installation of filters at the openings of tubes or chambers used to collect and measure gas fluxes. This type of sampling was recently conducted by Deng et al (2021), who measured the concentration of the solid components within the gas emissions but did not characterize the mineralogical and chemical features of the individual particles. Filters for collecting NPs from coal fires should consist of binder-free borosilicate glass microfibers.…”

Section: Improving Sampling Techniquesmentioning

confidence: 99%

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A review of the mineralogical and chemical composition of nanoparticles associated with coal fires

et al. 2022

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This review summarizes our current knowledge on the health and environmental impact as well as the mineralogical and geochemical composition of nanoparticles (NPs) associated with coal fires. It will furthermore recommend new sampling and characterization protocols to gain a better understanding of the various types of NPs that are formed either through high-temperature nucleation and alteration processes or via low-temperature dissolution-reprecipitation and weathering processes. Coal fires affect the immediate environment of coal-producing areas and produce positive and negative feedback to climate change through the emission of carbon-and sulfate-bearing gases and aerosols, respectively. Nanoparticles form during and after coal fires. They are composed of mainly soot and tar particles as well as amorphous phases, minerals, and complex mixtures of amorphous phases and minerals. It is recommended that NPs for mineralogical studies should be collected using impactors (a new generation of collectors for particulate matter, such as the TPS100 NP sampler) or that borosilicate filters at the openings of pipes and chambers be used to collect and measure gases emitted by coal fires. Furthermore, assemblages of NPs occurring at the mouths of coal fire vents should be examined using a combination of focused ion beam (FIB) technology and transmission electron microscopy (TEM), and those containing ion-or electron-beam sensitive phases should be examined with the corresponding cryo-techniques, such as cryo-FIB, cryo-ion mill, and cryo-TEM.The mineralogical and chemical composition of NP-bearing bulk samples should be examined with spectroscopy techniques such as X-ray photoelectron spectroscopy, 13 C nuclear magnetic resonance spectroscopy, or time-of-flight secondary ion mass spectroscopy.

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Section: Principal Factors Controlling the Emissions Of Coal Firesmentioning

confidence: 99%

Section: Recommendations For Improving the Research On Nps Associated...mentioning

confidence: 99%

Section: Improving Sampling Techniquesmentioning

confidence: 99%

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A review of the mineralogical and chemical composition of nanoparticles associated with coal fires

et al. 2022

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“…Alimzhanova et al studied the effectiveness of sprinkler systems in car parks; reductions in fatalities, injuries, and property damage were considered as potential benefits after installing sprinklers [ 27 ]. Deng et alattempted to analyze the impact of underground coal fire pollution on the atmospheric environment and the effects of toxic and harmful gases such as CO, CO 2 , SO 2 , and NO [ 28 ]. Ju et al determined a fire risk index system for a subway station through expert consultation [ 29 ].…”

Section: Literature Reviewmentioning

confidence: 99%

An Integrated Quantitative Risk Assessment Method for Underground Engineering Fires

Yuan

Zhu

Zhang

et al. 2022

IJERPH

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Fires are one of the main disasters in underground engineering. In order to comprehensively describe and evaluate the risk of underground engineering fires, this study proposes a UEF risk assessment method based on EPB-FBN. Firstly, based on the EPB model, the static and dynamic information of the fire, such as the cause, occurrence, hazard, product, consequence, and emergency rescue, was analyzed. An EPB model of underground engineering fires was established, and the EPB model was transformed into a BN structure through the conversion rules. Secondly, a fuzzy number was used to describe the state of UEF variable nodes, and a fuzzy conditional probability table was established to describe the uncertain logical relationship between UEF nodes. In order to make full use of the expert knowledge and empirical data, the probability was divided into intervals, and a triangulated fuzzy number was used to represent the linguistic variables judged by experts. The α-weighted valuation method was used for de-fuzzification, and the exact conditional probability table parameters were obtained. Through fuzzy Bayesian inference, the key risk factors can be identified, the sensitivity value of key factors can be calculated, and the maximum risk chain can be found in the case of known evidence. Finally, the method was applied to the deductive analysis of three scenarios. The results show that the model can provide realistic analysis ideas for fire safety evaluation and emergency management of underground engineering. The proposed EPB risk assessment model provides a new perspective for the analysis of UEF accidents and contributes to the ongoing development of UEF research.

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“…and heavy metals (As, Se, Hg, etc.) are released, resulting in smog, acid rain and underground drinking water pollution disasters (Deng et al 2021;Wu et al 2019). The production and life of residents are seriously threatened.…”

Section: Introductionmentioning

confidence: 99%

Ignition control and waste heat assessment of spontaneous combustion gangue hill by gravity heat pipe group: a case study in Shanxi Province, China

Zhou

Guo

Zhang

et al. 2023

Environ Sci Pollut Res

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Spontaneous combustion gangue hill has attracted great attention due to serious environmental pollution and terrible geological disasters. However, the rich thermal resources inside are often ignored. In order to control the spontaneous combustion of gangue hill and utilize the internal waste heat resources, this project studied the combined treatment effect of 821 gravity heat pipes, laid 47 sets of temperature monitoring devices, evaluated the storage of waste heat resources and proposed different waste heat utilization methods. The results show that: (1)The positions of spontaneous combustion are all located on the windward slope. The highest temperature is in the range of 6m~12m underground, exceeding 700 ℃. (2) The single-tube experiment of gravity heat pipe shows that the effective temperature control radius is 2m. The cooling effect is obvious in the range of 3m~5m underground.However, the temperature rises at the depth of 1 m underground. (3) After 90 days of treatment of the gravity heat pipe group, the temperature at the depths of 3m, 4m, 5m and 6m in the high temperature zone dropped by 56℃, 66℃, 63℃ and 42℃ respectively. The maximum temperature drop exceeds 160℃. The average temperature drop in the middle and low temperature areas is between 9°C and 21°C. (4) The concentration of harmful gases (CO, SO2 and H2S) decreases by more than 90%. The hazard level is greatly reduced. (5) The amount of waste heat resources contained within ten meters of the spontaneous combustion gangue hill is 7.83E13J. Waste heat resources can be used for indoor heating and greenhouse cultivation. And, under the temperature difference of 50 °C, 100 °C and 150 °C, the electric energy generated by the heat through the thermoelectric conversion device in the high temperature zone of the gangue hill is 4056.8 kW•h, 7468.2 kW•h and 10603 kW•h, respectively.

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Underground coal fire emission of spontaneous combustion, Sandaoba coalfield in Xinjiang, China: Investigation and analysis

Cited by 42 publications

References 34 publications

A review of the mineralogical and chemical composition of nanoparticles associated with coal fires

A review of the mineralogical and chemical composition of nanoparticles associated with coal fires

An Integrated Quantitative Risk Assessment Method for Underground Engineering Fires

Ignition control and waste heat assessment of spontaneous combustion gangue hill by gravity heat pipe group: a case study in Shanxi Province, China

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