Application of Inorganic Solidified Foam to Control the Coexistence of Unusual Methane Emission and Spontaneous Combustion of Coal in the Luwa Coal Mine, China

Zhaojun Tian, Yi Lu, Shimin Liu, Shiliang Shi, He Li, Qing Ye

Research output: Contribution to journalArticle

Abstract

Unusual methane emission and spontaneous combustion of coal induced by the air leakage are both hazards during mining. The most common practice has been to improve mine safety is sealing the mining fractures. In this paper, the methane and geology, coal spontaneous combustion characteristics and the coexistence of methane emission and spontaneous combustion of coal were analyzed. The preparation system of inorganic solidified foam (ISF) in field applications is studied and the working principle of generating device consists of foam generator and mixer was expounded. The technical plan of site construction is that the foam fluid was injected to respectively seal the mining fractures behind hydraulic supports, the cavities of air return corner, and the fractures nearby the coal pillar. After the foam fluid injection, the two stress values in the coal pillar eventually maintained above 15.5 Mpa and 13 Mpa, respectively. It indicated that the ISF can enhance the bearing stress ability of the coal pillar by transforming the stress state from two dimensional to three dimensional. The methane concentration in the air return corner and air return roadway declined significantly to 0.63% and 0.25%. The differential pressure inside and outside of the 4301(1) goaf fluctuated between −100 pa and 150 pa and the concentration of CO and O 2 declined to 9 ppm and 6%. The CO concentration in the air return corner finally reached a stable level of 6 ppm. What that all means, the foam fluids can seal the air leakage and inhibit spontaneous combustion of coal effectively.

Original languageEnglish (US)
JournalCombustion science and technology
DOIs
StatePublished - Jan 1 2019

Fingerprint

Spontaneous combustion
spontaneous combustion
Coal
Methane
Coal mines
foams
coal
Foams
China
methane
Air
air
Leakage (fluid)
Carbon Monoxide
Seals
Fluids
Bearings (structural)
leakage
fluid injection
Coal combustion

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

Cite this

@article{2175932e2da64c68b81ef24a68f1075a,
title = "Application of Inorganic Solidified Foam to Control the Coexistence of Unusual Methane Emission and Spontaneous Combustion of Coal in the Luwa Coal Mine, China",
abstract = "Unusual methane emission and spontaneous combustion of coal induced by the air leakage are both hazards during mining. The most common practice has been to improve mine safety is sealing the mining fractures. In this paper, the methane and geology, coal spontaneous combustion characteristics and the coexistence of methane emission and spontaneous combustion of coal were analyzed. The preparation system of inorganic solidified foam (ISF) in field applications is studied and the working principle of generating device consists of foam generator and mixer was expounded. The technical plan of site construction is that the foam fluid was injected to respectively seal the mining fractures behind hydraulic supports, the cavities of air return corner, and the fractures nearby the coal pillar. After the foam fluid injection, the two stress values in the coal pillar eventually maintained above 15.5 Mpa and 13 Mpa, respectively. It indicated that the ISF can enhance the bearing stress ability of the coal pillar by transforming the stress state from two dimensional to three dimensional. The methane concentration in the air return corner and air return roadway declined significantly to 0.63{\%} and 0.25{\%}. The differential pressure inside and outside of the 4301(1) goaf fluctuated between −100 pa and 150 pa and the concentration of CO and O 2 declined to 9 ppm and 6{\%}. The CO concentration in the air return corner finally reached a stable level of 6 ppm. What that all means, the foam fluids can seal the air leakage and inhibit spontaneous combustion of coal effectively.",
author = "Zhaojun Tian and Yi Lu and Shimin Liu and Shiliang Shi and He Li and Qing Ye",
year = "2019",
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doi = "10.1080/00102202.2019.1590347",
language = "English (US)",
journal = "Combustion Science and Technology",
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T1 - Application of Inorganic Solidified Foam to Control the Coexistence of Unusual Methane Emission and Spontaneous Combustion of Coal in the Luwa Coal Mine, China

AU - Tian, Zhaojun

AU - Lu, Yi

AU - Liu, Shimin

AU - Shi, Shiliang

AU - Li, He

AU - Ye, Qing

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Unusual methane emission and spontaneous combustion of coal induced by the air leakage are both hazards during mining. The most common practice has been to improve mine safety is sealing the mining fractures. In this paper, the methane and geology, coal spontaneous combustion characteristics and the coexistence of methane emission and spontaneous combustion of coal were analyzed. The preparation system of inorganic solidified foam (ISF) in field applications is studied and the working principle of generating device consists of foam generator and mixer was expounded. The technical plan of site construction is that the foam fluid was injected to respectively seal the mining fractures behind hydraulic supports, the cavities of air return corner, and the fractures nearby the coal pillar. After the foam fluid injection, the two stress values in the coal pillar eventually maintained above 15.5 Mpa and 13 Mpa, respectively. It indicated that the ISF can enhance the bearing stress ability of the coal pillar by transforming the stress state from two dimensional to three dimensional. The methane concentration in the air return corner and air return roadway declined significantly to 0.63% and 0.25%. The differential pressure inside and outside of the 4301(1) goaf fluctuated between −100 pa and 150 pa and the concentration of CO and O 2 declined to 9 ppm and 6%. The CO concentration in the air return corner finally reached a stable level of 6 ppm. What that all means, the foam fluids can seal the air leakage and inhibit spontaneous combustion of coal effectively.

AB - Unusual methane emission and spontaneous combustion of coal induced by the air leakage are both hazards during mining. The most common practice has been to improve mine safety is sealing the mining fractures. In this paper, the methane and geology, coal spontaneous combustion characteristics and the coexistence of methane emission and spontaneous combustion of coal were analyzed. The preparation system of inorganic solidified foam (ISF) in field applications is studied and the working principle of generating device consists of foam generator and mixer was expounded. The technical plan of site construction is that the foam fluid was injected to respectively seal the mining fractures behind hydraulic supports, the cavities of air return corner, and the fractures nearby the coal pillar. After the foam fluid injection, the two stress values in the coal pillar eventually maintained above 15.5 Mpa and 13 Mpa, respectively. It indicated that the ISF can enhance the bearing stress ability of the coal pillar by transforming the stress state from two dimensional to three dimensional. The methane concentration in the air return corner and air return roadway declined significantly to 0.63% and 0.25%. The differential pressure inside and outside of the 4301(1) goaf fluctuated between −100 pa and 150 pa and the concentration of CO and O 2 declined to 9 ppm and 6%. The CO concentration in the air return corner finally reached a stable level of 6 ppm. What that all means, the foam fluids can seal the air leakage and inhibit spontaneous combustion of coal effectively.

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