Experimental Study on Spontaneous Combustion Characteristics of Large Coal Particles after Soaking

Han, Guang; Dong, Ziwen; Li, Zhao; Zhang, Qianqian

doi:10.1021/acsomega.2c00521

Cited by 13 publications

(4 citation statements)

References 42 publications

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“…Liquid nitrogen fracturing has become a promising fluid fracturing technology, which provides a significant advantage for the utilization and development of geothermal energy. 43 In the future, we will further explore and improve the fracturing technology of high pressure multidischarge carbon dioxide gas, track the effect of coal seam permeability enhancement by establishing a long-term monitoring system, evaluate its sustainability, and conduct a comprehensive environmental impact assessment to ensure that the technology will not have a negative impact on groundwater, the surface environment, etc.…”

Section: Resultsmentioning

confidence: 99%

Improvement of Thick Coal Seam Gas Drainage Efficiency Using Highly Pressurized Multidischarge CO₂ Gas Fracturing Technique

Guo,

Zhong,

Zhang

et al. 2024

ACS Omega

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Thick coal seam fracture stimulations were conducted to enhance pre-gas drainage efficiency through the use of a highly pressurized multidischarge carbon dioxide gas fracturing technique. This method also offers potential as a strategy for carbon dioxide sequestration, aiding in the reduction of atmospheric carbon dioxide levels and thereby contributing to the fight against climate change. This paper discusses findings from both field experiments and numerical simulations. Data from the field show that the multidischarge fracturing approach significantly improves permeability in thick coal seams, thereby boosting gas drainage effectiveness. Additionally, the impact of increasing the number of fracturing devices is more pronounced at distances of 2.5 or 7.5 m from the borehole but becomes more complex at 12.5 m or further. The numerical simulations reveal that this technique primarily enhances coal seam gas drainage by improving the seam permeability and establishing a gas pressure gradient within the seam. It is noted that the radius of failure around the borehole wall expands with higher discharge pressures, while the radius of effective drainage narrows as the gap between discharge heads increases. Moreover, adding more discharge sets significantly influences the deformation and permeability of the coal seam within a 5 m radius of the fracturing borehole, but the influence is not obvious after 10 m from the fracturing borehole.

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Section: Resultsmentioning

confidence: 99%

Improvement of Thick Coal Seam Gas Drainage Efficiency Using Highly Pressurized Multidischarge CO₂ Gas Fracturing Technique

Guo,

Zhong,

Zhang

et al. 2024

ACS Omega

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“…The conversion rate ranges from 0.1 to 0.9. Table shows the calculation data of the experimental process. , According to the calculation data in the table, 1000/ T is taken as the horizontal coordinate and log[ G (α)/ T 2 ] is taken as the vertical coordinate; the R of the fitting curve obtained is >20.97. Through the analysis of the fitting curve of the activation energy of the experimental coal sample, the activation energy E and the pre-exponential factor A can be calculated, as shown in Table .…”

Section: Resultsmentioning

confidence: 99%

A Novel Microbial Compound Inhibitor and Its Efficacy in Preventing and Controlling Mine Fire Risks: A Case Study on Low-Rank Coal Spontaneous Combustion

Wang,

Liu,

et al. 2024

ACS Omega

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To guarantee the safety and sustainability of coal mining by effectively mitigating the substantial risk associated with coal spontaneous combustion, this study proposes a multifaceted prevention strategy aligned with green environmental principles. A compound flame retardant with a physicochemical control mechanism was prepared using indigenous microorganisms to mineralize residual coal after mining, utilizing Bacillus pasteurelli as a substitute material for inorganic salts. Under laboratory conditions simulating coal self-combustion, biobased flame retardants were employed to investigate the physical and chemical transformations of heat and mass evolution from ambient temperature to combustion in two representative low-rank coals. By quantitatively comparing alterations in microbiome-based groups among raw lignite, bioretarded lignite, and two control samples, the inhibitory mechanism of biobased materials on the oxygen reaction pathway was elucidated. The findings substantiated that biobased modification can consolidate the methyl and methylene groups present in aliphatic hydrocarbon side chains, which are prone to instigating low-temperature oxidation reactions. Additionally, the preventive performance of biobased flame retardants was assessed through temperature-programmed experiments, which involved estimating the critical self-heating temperature, oxygen consumption, and gas production rates of compared coal samples. The results demonstrated significant enhancements in the resistance to spontaneous combustion following bioretarded modification. Notably, the identification grade of long flame coal shifted from easy to moderate susceptibility to spontaneous combustion. Furthermore, biobased flame retardants exhibited remarkable flame retardancy rates of approximately 80% for lignite, thereby validating their efficacy as more environmentally friendly and technologically advanced substitute materials for inhibiting spontaneous combustion in low-rank coals.

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“…156 A deep parallel residual convolution neural network (DPRCNN) for predicting the degree of slagging in the precombustion chamber (PCC) of boilers has also been investigated. 145 4.4. Fuel Additive Technology.…”

Section: Advanced Mitigation Techniquesmentioning

confidence: 99%

Advances in Efficient Utilization of Low-Rank Fuels in Coal and Biomass-Fired Systems: A Comprehensive Review

Bankefa,

Nasah,

Laudal

et al. 2024

Energy Fuels

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While coal−biomass cocombustion has gained considerable attention as a climate-sensitive power generation strategy, the detrimental impact of inorganic species present in low-rank fuels can lead to counterproductive outcomes in combustion systems. Low-rank solid fuels negatively affect heat transfer efficiency and energy conversion during steam generation, resulting in adverse environmental consequences. However, a combination of improved combustion technology and fuel quality improvements can enable the safe utilization of these fuels. This review highlights the pressing need for research in fuel quality improvement as an effective climate change mitigation strategy during the global transition to renewable energy sources. Identifying the problematic species in solid fuels and understanding the mechanisms of ash formation are critical steps toward designing effective strategies to control ash aerosol-induced fouling. The paper discusses methods for promoting clean combustion, including fuel pretreatment and cocombustion. Additionally, the review examines recent advancements in fuel improvement strategies, such as CFD-targeted-in-furnace injection (CFD-TIFI), intelligent soot blowing, and fuel additive technology, with a focus on mineral additives. Due to its high efficiency, low cost, and minimal retrofit requirements, additive technology holds promise for large-scale applications, paving the way for fuel flexibility in utility-scale power generation. The current study emphasizes the importance of fuel ash mineral transformation and characterization techniques for evaluating the effectiveness of fuel additives. Assessing the viability of utility-scale applications economically and the feasibility of a large-scale demonstration requires further research.

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Experimental Study on Spontaneous Combustion Characteristics of Large Coal Particles after Soaking

Cited by 13 publications

References 42 publications

Improvement of Thick Coal Seam Gas Drainage Efficiency Using Highly Pressurized Multidischarge CO₂ Gas Fracturing Technique

Improvement of Thick Coal Seam Gas Drainage Efficiency Using Highly Pressurized Multidischarge CO₂ Gas Fracturing Technique

A Novel Microbial Compound Inhibitor and Its Efficacy in Preventing and Controlling Mine Fire Risks: A Case Study on Low-Rank Coal Spontaneous Combustion

Advances in Efficient Utilization of Low-Rank Fuels in Coal and Biomass-Fired Systems: A Comprehensive Review

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Experimental Study on Spontaneous Combustion Characteristics of Large Coal Particles after Soaking

Cited by 13 publications

References 42 publications

Improvement of Thick Coal Seam Gas Drainage Efficiency Using Highly Pressurized Multidischarge CO2 Gas Fracturing Technique

Improvement of Thick Coal Seam Gas Drainage Efficiency Using Highly Pressurized Multidischarge CO2 Gas Fracturing Technique

A Novel Microbial Compound Inhibitor and Its Efficacy in Preventing and Controlling Mine Fire Risks: A Case Study on Low-Rank Coal Spontaneous Combustion

Advances in Efficient Utilization of Low-Rank Fuels in Coal and Biomass-Fired Systems: A Comprehensive Review

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Improvement of Thick Coal Seam Gas Drainage Efficiency Using Highly Pressurized Multidischarge CO₂ Gas Fracturing Technique

Improvement of Thick Coal Seam Gas Drainage Efficiency Using Highly Pressurized Multidischarge CO₂ Gas Fracturing Technique