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Reactivity study of fine discard coal agglomerates
(Elsevier, 2015)
In this laboratory study thermo-gravimetric analyses were conducted to determine the influence of the addition of an alkaline metal catalyst (K2CO3 incorporated into a fine discard coal agglomerate mixture by physical ...
Performance evaluation of a high-throughput microchannel reactor for ammonia decomposition over a commercial Ru-based catalyst
(Elsevier, 2015)
In this work, the prospect of producing hydrogen (H2) via ammonia (NH3) decomposition was evaluated in an experimental stand-alone microchannel reactor wash-coated with a commercial Ruthenium-based catalyst. The reactor ...
Pore development during gasification of South African inertinite-rich chars evaluated using small angle X-ray scattering
(Elsevier, 2015)
Pore development arising from steam and CO2 gasification of a char, prepared from an inertinite-rich Witbank Seam 4 coal, was investigated using small angle X-ray scattering. The char, ∼75 μm, was gasified to specific ...
A laboratory scale fixed-bed coal conversion reactor. Part 1. Operation, reaction zone identification and industrial representativeness
(Elsevier, 2015)
Fixed bed coal gasification and combustion operations form an important part in the global energy supply, and these processes are characterized by complex interactions which are difficult to study on an industrial scale. ...
Comparing the porosity and surface areas of coal as measured by gas adsorption, mercury intrusion and SAXS techniques
(Elsevier, 2015)
In this paper, we compare the surface area, porosity and other physical–structural properties of four bituminous coals from three different coal fields of South Africa determined using carbon dioxide (CO2) and nitrogen ...
Influence of potassium carbonate on the swelling propensity of South African large coal particles
(ACS, 2015)
The swelling propensity of some coals may restrict their use in fixed- and fluidized-bed gasification operations, and effective reduction of swelling can widen the applicability of these coals. Extensive research has been ...
Influence of maceral composition on the structure, properties and behaviour of chars derived from South African coals
(Elsevier, 2015)
The generation of coal chars is an important intermediate step in coal conversion processes such as combustion and gasification. The char structure impacts their behaviour in these processes. Detailed investigations on ...
Reduction of caking propensity in large (millimeter-sized) South African coal particles with potassium carbonate impregnation to expand fixed- and fluidized-bed gasification feedstock suitability
(ACS, 2015)
The caking propensity of coal causes challenges in combustion, gasification, and fluidized-bed applications, where this property limits coal selection. Certain gasifiers are fitted with mitigation technologies such as ...
The effect of acid washing on the pyrolysis products derived from a vitrinite-rich bituminous coal
(Elsevier, 2015)
Extensive characterization of the pyrolysis products, derived from raw and acid washed samples of a vitrinite-rich South African bituminous coal is reported. Pyrolysis experiments were carried out with use of a modified ...
The characterisation of slow-heated inertinite- and vitrinite-rich coals from the South African coalfields
(Elsevier, 2015)
The development of coal char structures with pyrolysis has been extensively investigated but has traditionally been focused on the carboniferous coals in the northern Hemisphere. In this investigation, the properties of ...