SponComGAS™ testing
The gas evolution trends that occur in response to increasing coal temperature can be used for the early detection of a self-heating event. CB3 can determine the unique gas evolution trends for your situation which can be vital to define and support the alarm limits set in the Trigger Action Response Plans (TARPs) developed as part of the Spontaneous Combustion Principal Hazard Management Plan for an underground coal mine or any form of transportation and stockpiling. The test is normally started at the in-mine temperature condition to determine the presence of any seam gas and background levels of gas evolution. Gas samples are subsequently obtained at regular intervals as the coal temperature increases up to approximately 200 °C. The samples are analysed by Gas Chromatography to determine the concentrations of Oxygen, Nitrogen, Methane, Carbon Dioxide, Carbon Monoxide, Ethane and Ethylene. The characteristic trend in gas evolution obtained for the coal can then be used to define the most appropriate indicator gases or ratios to be implemented into a site specific TARP.
Figure 3: SponComGAS™ test results showing individual gas evolution trends for a high volatile bituminous coal.
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