Research on complex air leakage method to prevent coal spontaneous combustion in longwall goaf

Wang, Kun; Tang, Haibo; Wang, Fengqi; Miao, Yong; Liu, Dapeng

doi:10.1371/journal.pone.0213101

Cited by 32 publications

(16 citation statements)

References 24 publications

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“…In addition, dame sheets should be arranged outside the block wall and at the corner of the transportation roadway and the ventilation roadway of working face #10414. The anchor cable parts should be removed to fully cave the top coal at the corner of the roadway, reduce air leakage, and prevent heat accumulation (Figure ) …”

Section: Discussionmentioning

confidence: 99%

“…The anchor cable parts should be removed to fully cave the top coal at the corner of the roadway, reduce air leakage, and prevent heat accumulation ( Figure 9). [49][50][51][52][53][54] 6 | CONCLUSIONS In this paper, for the situation where the roof caving strength in a deep coal seam mine is relatively high, we analyze the relationship between the LDRC and CSC in the gob. In addition, we present a calculation model for CSC based on porosity and use working face #10414 in the Yangliu coal mine as an example to verify the correctness of the ASM.…”

Section: Suggestions For Fire Prevention and Extinguishing In The Minementioning

confidence: 99%

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Study of the influence of the characteristics of loose residual coal on the spontaneous combustion of coal gob

Shu

et al. 2019

Energy Science & Engineering

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Mine fires are becoming a serious issue as the intensity of mining increases, especially in deep mines. Loose coal gob has a hidden ignition location and a high possibility of spontaneous combustion, which makes fire prevention difficult. Therefore, based on the theory of gas seepage and the characteristics of loose coal, a model of air leakage and spontaneous combustion in gob is established in this paper. Using working face #10414 in the Yangliu coal mine as an example, the relationship between the three spontaneous coal combustion (CSC) zones and the three stress zones is analyzed and verified by combining a FLAC3D simulation with field monitoring. In addition, the influence of advancing speed on the CSC is discussed, and suggestions for fire prevention are presented. The results show that the variation in the calorific value of the CSC with increasing degree of looseness of the residual coal in the gob forms an arch‐shape. There is a one‐to‐one relationship between the distribution of the three stress zones and the three CSC zones. In addition, as the advancing speed increases, the contact time between the loose coal body and the air decreases and the possibility of CSC decreases. This study provides a scientific basis for fire prevention and control in mines.

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Section: Discussionmentioning

confidence: 99%

Section: Suggestions For Fire Prevention and Extinguishing In The Minementioning

confidence: 99%

Study of the influence of the characteristics of loose residual coal on the spontaneous combustion of coal gob

Shu

et al. 2019

Energy Science & Engineering

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“…After the overlying strata of the gob are broken and collapsed, an irregular caving zone is formed by the free accumulation of broken rock blocks in the lower part of the gob …”

Section: Evolution Law Of the Permeability Characteristics Of The Gobmentioning

confidence: 99%

Evolution and application of airflow permeability characteristics of gob in roof cutting and pressure releasing mining method

Chen

Wang

et al. 2020

Energy Science & Engineering

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Cutting roof and release pressure technology has changed the pressure transmission mode of the roof and the caving characteristics of roof rock, which in turn has changed the permeability evolution of the gob. To obtain the permeability characteristics of the gob for the roof cutting and pressure releasing mining method, a mathematical model for the gob voidage and permeability was established by analyzing the overlying strata movement law and the lateral stress variation in the gob. The airflow migration law of haulage roadway 12 201 in Halagou coal mine was studied using Fluent software and an established mathematical model. The main conclusions obtained are as follows: The overburden pressure and lateral stress in the gob gradually increase with the advancement of the working face; along the direction of the retaining roadway, there are two roadway windflows entering the critical zones (the 22-100 m and 390-398 m sections). The inflow at these two sections accounted for 59% of the total air inflow, of which the most critical is the 28-53 m section, which accounts for 43% of the total air inflow in the two severe air leakage sections. The findings of this work provide a theoretical basis for the implementation of antileakage technology in the gob under the roof cutting and pressure releasing mining method and help reduce the risk of spontaneous combustion in the gob. K E Y W O R D Scaving characteristics of roof rock, cutting roof and release pressure, gob, voidage and permeability model 2074 |

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“…When injecting nitrogen, the nitrogen does not remain in a fixed position for a long time and is easy to spread with airflow, which results in the risk of suffocation. 10 So, the effect of extinguishing and cooling in coal oxidation by injecting nitrogen is unsatisfactory. In grouting, the slurry flows to the low-lying zone and does not keep in the upper parts in the goaf.…”

Section: Introductionmentioning

confidence: 99%

“…Inert gases (N 2 and CO 2 ), grouting, foam, or gel have been used to prevent fires in coal mines. When injecting nitrogen, the nitrogen does not remain in a fixed position for a long time and is easy to spread with airflow, which results in the risk of suffocation 10 . So, the effect of extinguishing and cooling in coal oxidation by injecting nitrogen is unsatisfactory.…”

Section: Introductionmentioning

confidence: 99%

Preparation and optimization of thermosensitive hydrogels for inhibiting coal oxidation

et al. 2021

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Currently, the prevention and control of coal spontaneous combustion (CSC) mainly depend on liquid or inert gas injection. In this study, the mixed sol solution was prepared with methylcellulose (MC), polyethylene glycol (PEG), and surfactant sodium dodecyl sulfate (SDS). It has the advantages of in-situ, nontoxicity, easy biodegradation, etc., and can retain a large amount of water by sol-gel transition. The effect of each component on the gel properties was analyzed by using central composite design (CCD) of response surface methodology (RSM). The optimal values of independent variables were 1.99 wt% MC, 6 wt% PEG, and 8 mM/L SDS, under which the response values were obtained as gelation temperature 70 C, gelation time 75 seconds, gel strength 20.32 kPa, and seepage rate 28.51%. The obtained thermosensitive hydrogel (TSH) was characterized by Fourier transform infrared spectroscopy (FT-IR) and differential scanning calorimetry (DSC). The results showed that the hydrogel was formed by physical cross-linking of MC-PEG-SDS ternary system. The gelation temperature of MC increased in the coexistence of SDS and PEG. The

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Research on complex air leakage method to prevent coal spontaneous combustion in longwall goaf

Cited by 32 publications

References 24 publications

Study of the influence of the characteristics of loose residual coal on the spontaneous combustion of coal gob

Study of the influence of the characteristics of loose residual coal on the spontaneous combustion of coal gob

Evolution and application of airflow permeability characteristics of gob in roof cutting and pressure releasing mining method

Preparation and optimization of thermosensitive hydrogels for inhibiting coal oxidation

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