the olang area is a part of gheshlagh-olang synclinal, which is a member of eastern alborz coal basin and is situated at a distance of70 km northeast of shahroud city. coal-bearing strata of this region are part of the shemshak group (upper triassic to lower jurassic).samples from the 9 coal seams of the olang coal deposits were collected and ashed. the aim of this study is to determine theoccu...

The combustion of pulverised coal in power stations results in slagging and fouling in the boiler section and this can be a more severe problem when co-fired with biomass, especially straw. Prediction of the effects of different combination of biomass and coal are helpful to the plant operators. Predictive software gives information about the onset and nature of the slag formed but often the re...

Industrial coal combustion ashes as well as laboratory-scale experiments were used for the evaluation whether CaO, Al2O3 and Fe2O3 can help with the retention of volatile and acid-forming elements (S, Cl, Br, As and Se). Both industrial ashes evaluation and laboratory combustion experiments lead to the conclusion that CaO can efficiently help with the capture of not only S, but also of Cl, Br, ...

This article describes modelling and simulation advances for the gasification systems. The generalized approach pursued in developing the models allows to characterize the main phenomena involved in the gasification process of coal, biomass and organic wastes. Actually, multi-scale, multi-phase, and multicomponent systems are described by means of complex kinetic mechanisms for gas-solid phases...

Arsenic and selenium compounds may be emitted to the environment during coal conversion processes, although some compounds are retained in the fly ashes, in different proportions depending on the characteristics of the ashes and process conditions. The possibility of optimizing the conditions to achieve better trace element retention appears to be an attractive, economical option for reducing t...

~. Generation of electricity by coal-f~ed power plants produces large quantities of bottom ash and fly ash. New power plants commonly use fluidized bed combustion (FBC) boilers, which create ashes with high neutralization potential (NP). These ashes, due to their alkaline nature, are often used in surface mine reclamation projects to neutralize acidity and reduce hydraulic conductivity of distu...

Title of Document: CHARACTERIZATION OF TRACE METAL LEACHING FROM MARYLAND COAL FLY ASHES Enes Ozkok, Master of Science, 2011 Directed By: Associate Professor Ahmet Aydilek, Department of Civil and Environmental Engineering Three coal fly ashes with different acid-base characteristics and their mixtures with an embankment soil were analyzed for arsenic, copper, and chromium leaching as function ...

Processing of pine wood chips in a pilot-scale downdraft gasifier generated a carbon-rich fly ash as a byproduct. Studies on biomass-derived fly ashes have generally focused on their direct characterisation, as generated, to develop options for utilisation or disposal. Analogous to studies on coal-derived fly ashes, strategies were applied here to assess the feasibility of isolating chars for v...

Coal fly ash is formed as a solid waste product from the combustion of coal in coal fired power stations. Huge amounts of fly ash are produced globally every year and are predicted to increase. Nowadays, less than half of the fly ash is used as a raw material for cement manufacturing, construction and the rest of it is disposed as a waste causing yet another environmental concern. For this reas...