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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN='8th ECIC & 9th ICSTI 2022':MAILTO:info@ecic-icsti.com
LOCATION:Room „Danzig“
SUMMARY:In-situ study of plastic layer permeability during coking of Australian coking coals
DESCRIPTION:The plastic layer permeability was investigated by using an integrated permeability/dilatation measurement rig and an in-situ permeability rig. The integrated measurement rig enabled the synchronized measurements of permeability and dilatation of coal samples during heating. The in-situ permeability measurement was fitted in the 4kg lab-scale double heated wall coke oven to measure the plastic layer permeability under thermal gradient induced coking conditions. To interpret the measurement data, the microstructure transitions across the plastic layer samples obtained from the plastic layer sampling technique fitted in the 4kg coke oven were analyzed by Synchrotron micro-CT. The permeability results and pore structure parameters derived from those analyses were correlated to better understand the mechanism of plastic layer permeability. Among all samples tested, the high-rank coking coal with low fluidity showed the lowest permeable peak at the later thermoplastic stage, corresponding to the high internal gas pressure (IGP). The microstructure in the resolidified layer of the high-rank coal was characterized by the lowest number of isolated pores and the larger volume of open pores within a larger size range of 50-100 µm, compared to those of the lower rank coals. In addition, its pore wall structure was highly compacted due to the high IGP. Based on these observations, a likely explanation of the lowest permeability of the high-rank coal is that the lower deformability of the pore wall structure at the later thermoplastic stage may have prevented additional pore growth, which prevented pore interconnectivity and decreasing permeability. For the high-pressure coal, there was a slight decrease in porosity in the initial softening layer. It is possible that the formation of the low permeable barrier redirected the plastic mass toward the loose coal side, thus increasing the fluidity of the region and filling the interparticle voids. These results suggest that the plastic layer permeability 
CLASS:PUBLIC
DTSTART:20220630T151000
DTEND:20220630T153500
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