Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Anthony H. Clemens"'
Publikováno v:
International Journal of Coal Geology. 45:163-179
Acid producing potential static tests have been undertaken on sample lithologies from New Zealand coal mines, to rank the lithologies into acid producing waste rock and stable non-acid producing waste rock. Results indicated that the main acid produc
Publikováno v:
Fuel. 78:1379-1385
During coal combustion, the partitioning behaviour of the volatile toxic trace elements, boron, arsenic and selenium, is influenced by the highly alkaline nature of a typical New Zealand industrial sub-bituminous coal, and the combustion regime (unde
Publikováno v:
Fuel. 77:1017-1020
It is known that several factors influence the ability of calcium to catalyse the steam-activated gasification of chars derived from low rank coals. One of the most important is that calcium which is ion exchanged on to the parent coal is more likely
Autor:
Anthony H. Clemens, Trevor W. Matheson
Publikováno v:
Fuel. 75:891-895
The self-heating of coal mainly involves exothermic reactions of oxygen at reactive radical sites within the coal and the enhancing or moderating effect that water has on these reactions. The thermal response of samples of low-rank coals, dried by he
Autor:
Brian H. Robinson, Haruo Kumagai, R. Melville Carr, Anthony H. Clemens, Trevor W. Matheson, Barrie M. Peake
Publikováno v:
Fuel. 74:389-394
The changes in radical concentrations and species brought about by vacuum and gas flow drying of New Vale lignite and Stockton bituminous coal samples were studied. Vacuum drying produces a sudden increase in concentration, flow drying a more gradual
Autor:
Anthony H. Clemens, Trevor W. Matheson
Publikováno v:
Fuel. 74:57-62
The modification of Gieseler fluidity development in coals by various pretreatments is examined and clarified. These pretreatments include the addition of solvent extracts, preheating and quenching, addition of radical stabilizers and blending. The e
Publikováno v:
Fuel. 70:215-221
The chemical and thermal responses of six dried coals on exposure to a flow of oxygen or air were studied using isothermal differential thermal analysis (DTA) and temperature-programmed in situ diffuse reflectance infrared Fourier Transform spectrosc
Publikováno v:
Fuel. 69:255-256
Differential thermal analyses of reactions between dried low rank coals and oxygen at temperatures of 30, 60, 90, 120, 150 and 180 °C show an immediate, sharp exothermic response. The exotherm increases with increasing temperature and is most pronou
Publikováno v:
Journal of the American Chemical Society. 109:1773-1782
Publikováno v:
Fuel. 68:1162-1167
Highly fluid fresh bituminous coals were oxidised and four techniques (cross-link measurement, chloroform extraction, proton magnetic resonance thermal analysis (PMRTA) and FT-i.r. diffuse reflectance spectroscopy) were used to correlate Gieseler flu