dc.contributor.author | Bunt, J.R. | |
dc.contributor.author | Marx, S. | |
dc.contributor.author | Waanders, F.B. | |
dc.contributor.author | Leokaoke, N.T. | |
dc.date.accessioned | 2018-06-19T11:17:20Z | |
dc.date.available | 2018-06-19T11:17:20Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Bunt, J.R. et al. 2018. Green coal development for application in fixed-bed catalytic gasification. Journal of the Southern African Institute of Mining and Metallurg, 118(4):419-429. [http://dx.doi.org/10.17159/2411-9717/2018/v118n4a12] | en_US |
dc.identifier.issn | 2225-6253 | |
dc.identifier.issn | 2411-9717 (Online) | |
dc.identifier.uri | http://hdl.handle.net/10394/27680 | |
dc.identifier.uri | http://dx.doi.org/10.17159/2411-9717/2018/v118n4a12 | |
dc.identifier.uri | http://www.saimm.co.za/Journal/v118n04p419.pdf | |
dc.description.abstract | A novel ‘green coal’ product formulation has recently been developed and
the utilization concept tested at the North-West University coal research
laboratories. Hydrothermal liquefaction was used to produce bio-oil and
biomass char from sweet sorghum bagasse at operating temperatures
ranging between 280 and 300°C, and the resultant char was mixed in
various ratios (0, 0.25, 0.50, 0.75, and 1) with fine medium-rank C
bituminous discard coal (<212 um) and CaCO3 (1–5 wt%). The mixtures
were pressed into 12 × 12 mm pellets using an LRX press at a pressure of 4
bar and gasified using CO2 at atmospheric pressure and temperatures
ranging between 800 and 1000°C. Kinetic parameters obtained from the
experimental data showed that the reaction rate of the biochar was an order
of magnitude higher than that of raw coal, with the blend containing 3 wt%
CaCO3 having the fastest reaction rate. In order to study the effect of
temperature and catalyst on the retention of elemental sulphur during
combustion of the various pellets, a combustion set-up consisting of a
furnace, glass bayonet-type reactor, Liebig cooler, liquid traps, and an SO2
gas analyser was used, with experiments conducted at temperatures
between 500 and 800°C. As expected, sulphur retention was low for the raw
coal and biochar blends, but increased significantly to between 56 and 86%,
decreasing with increasing temperature, in the runs with added metal
catalyst/sorbent. A simulation using FactSageTM predicted that >50% of the
pyritic sulphur entering the fixed-bed gasifier would be removed from the
gaseous phase as insoluble CaSO4 when operated in a catalytic gasification
mode at a temperature of 800°C, which is in good agreement with the
experimental findings | en_US |
dc.language.iso | en | en_US |
dc.publisher | SAIMM | en_US |
dc.subject | Coal briquette | en_US |
dc.subject | Catalytic gasification | en_US |
dc.subject | Reactivity | en_US |
dc.subject | Sulphur retention | en_US |
dc.title | Green coal development for application in fixed-bed catalytic gasification | en_US |
dc.type | Article | en_US |
dc.contributor.researchID | 20164200 - Bunt, John Reginald | |
dc.contributor.researchID | 10216847 - Marx, Sanette | |
dc.contributor.researchID | 10059571 - Waanders, Frans Boudewijn | |
dc.contributor.researchID | 20897952 - Leokaoke, Nthabiseng Tumelo | |