大規模炭層火災および自然発火の消火によるCO2大気放出量削減に関わる研究アプローチについて

Translated title of the contribution: A Research Approache for Reducing Natural CO2 Emissions by Extinguishing A Large Scale of Coal Fires and Spontaneous Combustions

K. Sasaki, Hemeng Zhang, Salmawati, Yongjun Wang, Chea Samneang, Ronald Nguele, Yuichi Sugai, Xiaoming Zhang

Research output: Contribution to journalReview article

Abstract

underground coal seams and spontaneous combustions in coal piles in the world. To reduce the emissions of combustion gases, such as CO2, CH4, etc., some technical challenges and researches are required related to CO2 flux measurements, developing an effective chemical water-solution extinguishes coal fires and inhibits spontaneous combustion, constructing a numerical simulation model to treat the aging effect in coal heating rate.
In this article, firstly, the previous studies were reviewed to explain measurement results of CO2 emission from coal fire/spontaneous combustion fields and the aging model used to simulate coal heating rate. Secondary, a trial development of some chemical solutions has been introduced to inhibit microscopic and macroscopic coal oxidations by forming a gel. Especially, sodium meta silicate solution showed a relatively good performance shifting the critical self-ignition temperature (CSIT) of a low rank coal to be 4 to 5℃ higher than that of water by forming gel with CO2 gases in the air and combustion gases emitted from coals. The brooking effect in macro scale
by forming gel is also expected to extinguish coal seam fires by reducing aperture width in fractures connecting to the atmosphere. A numerical simulation using ANSI FLUENT has showed an extinguishing fire process of an underground coal seam including a horizontal fracture that is connected inlet and outlet fractures being air paths for air and combustion gas, respectively.
Finally, the the research challenges required for technical developments have been proposed to carry a project extinguishing the coal seam fires and spontaneous combustions of coal piles with reducing CO2 emissions.
Translated title of the contributionA Research Approache for Reducing Natural CO2 Emissions by Extinguishing A Large Scale of Coal Fires and Spontaneous Combustions
Original languageJapanese
Pages (from-to)99-109
Number of pages11
JournalJournal of MMIJ
Volume136
Issue number9
DOIs
Publication statusPublished - Oct 5 2020

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

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