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• W2462397855 abstract "Canister desorption is a widely used technique to measure the gas content of coal. The gas content data when normalised to volume / weight and multiplied by coal seam mass is used to estimate the gas in place in an area around the cored hole. However the gas content and the percentage of each constituent are likely to be influenced by trapped air in the canister at the time of the coal enclosure and subsequent sealing. Freshly cored coal samples were collected from three mines, mining coal from the Bulli seam, Sydney Basin. The underground mines were Appin West, West Cliff and Tahmoor. The research programme spanning a period of four years, focused only on the influence of the entrapped air in the canister on coal gas percentage of each constituent. It was found that the percentage of each coal gas constituent was influenced by the trapped air in the canister space. The effect of trapped air was extended to the component percentage of the gases in the crushed coal samples, normally used for the estimation of Q3. INTRODUCTION Canister desorption is a widely used technique to measure the gas content of coal. The gas content data when normalised to volume /weight and multiplied by coal seam mass is used to estimate the gas in place in an area around the cored hole. However the gas content and its components are likely to be influenced by the presence of trapped air column in the canister, particularly when the canister is not fully occupied by the coal column and the trapped air, if not removed, may likely to be a concern. Gas composition has been widely used to mean the percentage of each gas in a mixture of gas liberated from solid intact coal. This is not an appropriate phrase to be used when dealing with gas content measurement using canisters. The use of the phrase “gas component percentage“, is an acceptable terminology as it refers to the percentage of each gas in the canister space, which may be influenced by the trapped contaminant air Three systems of countering the influence of air column on the gas content of coal have been recognised in some gas processing laboratories are (a) by neutralising the canister air by flushing the air with helium gas; b) by calculating the level of air components in the canister and then recalculate the gas content of the gas in the canister, and c) by filling the air space with inert solid blocks and flushing out the rest of the remaining air with inert gas. Polymeric solid blocks rods are known to be used for canister’s unoccupied space filling, as these rods do not react with coal gases. No consideration has been given in this paper on the issue of water vapour correction as the objective of the paper was primarily for coal gas component percentages analysis and its variations with trapped air contaminants. While all these techniques are used, however, no studies have previously been reported to scientifically examine the impact of the air trapped in canisters on the overall estimation of (a) the gas content of coal (Qm), where Qm = Q1 +Q2 +Q3 , (b) coal gas component percentages, (c) component percentages of both Q2 and Q3. This paper reports on the findings of the study, and demonstrates the importance of eliminating or flushing out air pockets in canister columns. MEASUREMNT OF GAS CONTENT OF COAL Measurement of the gas content of coal samples involves three stages of Standards Australia (1999), (i) Determining the gas lost from the coal sample during core sample recovery (Q1), (ii) Measuring the gas desorbed from the coal sample, while sealed in a desorption canister (Q2), 1 School of Civil, Mining and Environmental Engineering, University of Wollongong, NSW, Australia. E-mail: naj@uow.edu.au, Tel: +61 242213449, M: 0466613184, 2016 Coal Operators’ Conference The University of Wollongong 358 10 – 12 February 2016 (iii) Measuring the gas released from a coal sub-sample during crushing (Q3). The gas content measured during the above listed stages is added together to give the total measured gas content (Qm) as:" @default.
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• W2462397855 date "2016-01-01" @default.
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• W2462397855 title "The Effect of Air Column in Transport Canisters on Measured Gas Contents" @default.
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