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Hydraulic fracturing is an effective way of improving permeability of coal seams. Performance of the fracturing fluid is a key factor affecting the extent of improvement. Coal-seam permeability directly affects the difficulty of coal-bed methane extraction and is mainly related to the pore size. Comparison of the influence of water, which is widely used in underground fracturing, and viscoelastic...
Phosphogypsum (PG) is a by-product in the phosphate fertilizer industry, and low rank coal-lignite has high moisture which seriously influence its direct use. As a promising raw material for chemical industry, syngas can be obtained through a properly designed lignite Chemical Looping Gasification (CLG) of PG oxygen carrier. The understanding of the reaction mechanism has been developed, while optimal...
Greenhouse gas emissions in the transport sector can significantly be reduced by replacing fossil based fuels with green alternatives. Various alternative fuel concepts have been developed differing in used sustainable feedstock, synthesis technology and final fuel characteristics. Whether these fuels can succeed in the market will depend on the fuel net production costs, the expected cost reduction...
This study investigated the effect of cultivation parameters on microbial oil production from hydrolysate of oil palm empty fruit bunch (EFB) using fungus Mucor plumbeus. The parameters selected for evaluation were sugar concentration (30–100g/L), yeast extract concentration (0–13.3%, g yeast extract/g sugar), pH (5–7) and spore concentration (4.3–6.3, log spore number/mL medium). Response surface...
Basin and petroleum system modeling requires source rock kinetics as input for the reconstruction of hydrocarbon generation history. For less well-studied petroleum systems, there may be little information on petroleum generation kinetic parameters publically available; thus, an analog of representative source rock kinetics must be chosen from available kinetics databases. Recent studies suggest that...
Ash deposition, fouling, and slagging are commonly undesirable occurrences in coal utility boilers and gasifiers. Ash deposit formation is usually initiated by sintering of the particles. The sintering characteristics of the ash have to be evaluated to understand the process of deposit formation. Cold compression strength (CCS) tests on heat treated ash pellets produced under defined conditions can...
A dynamic CFD model, which is based on the inertia impaction, the thermophoresis and the direct alkali vapour condensation incorporating the influence of the heat transfer to the tube, has been developed for predicting the ash deposition formation in Zhundong lignite combustion in a pilot-scale furnace. The results show that particle deposition from the inertia impaction and the thermophoresis dictates...
Silicon carbide (SiC) supported vanadium catalysts were obtained using the wet chemical impregnation method, and their removal of NOx with the presence of SO2 at low temperature was evaluated. The effect of carbon was observed by comparing different carbon-based catalysts. V2O5/SiC (1wt.%) catalyst had a NOx removal efficiency of 86% in the presence of SO2 at 250°C with a GHSV of 180,000h−1. In this...
Binders can be employed to improve the particle adhesion, compressive strength, abrasion resistance and energy content of densified biomass, such as briquettes. They may also reduce the energy cost of producing such briquettes, by reducing the compaction pressure, conditioning temperature and the wear on production equipment.This study explored and compared the effects of three different binders,...
The effect of hydrotreatment of liquefied heavy oil on direct coal liquefaction (DCL) was studied by hydrogenating the liquefied heavy oil (initial boiling point greater than 320°C) in a 30ml continuous hydrogenation apparatus at operating conditions of pressure (P) 13–19MPa, temperature (T) 360–400°C, liquid space velocity (LHSV) 0.6–1.4h−1. After hydrogenation, the properties and hydrocarbon composition...
Pre-gas drainage plays a significant role in the prevention of coal and gas outburst in underground coal mines. However, difficulties of reducing the content of coal seam gas, especially localized coal seam CO2, to be below threshold values within a given drainage lead time have been encountered in numerous coal mines in Australia. As the proneness of nitrogen outburst is way smaller than CO2 or methane...
Wettability of CO2/water/coal systems is a fundamental petro-physical parameter, which governs the fluid flow and distribution in coal seams and thus directly affects CO2-storage and methane recovery from unmineable coal seams. The recognition of wettability of coal/CO2/brine systems help to de-risk CO2-storage and enhanced methane recovery projects in coal seams. To understand the factors influencing...
Liquid nitrogen (LN2), a non-aqueous medium, has attracted attention in recent years as a fluid for fracturing in the petroleum/energy industry. This study proposes a freeze-thaw method using LN2 to improve coal permeability for the production of coal bed methane. Experiments were conducted using nuclear magnetic resonance (NMR) to explore the physical properties of frozen-thawed coal. The coal samples...
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