Utilization Of High Sulfur Coals Research Articles

Effect of pre-desulfurization process on the sulfur forms and their transformations during pyrolysis of Yanzhou high sulfur coal

To achieve the utilization of high sulfur coals efficiently and economically, the effects of different pre-desulfurization processes including flotation, acid washing, ultrasonication and stepwise treatment on sulfur removal and changes of sulfur forms in a high sulfur coal, sulfur transformation behavior during pyrolysis and sulfur distribution in char were investigated. Flotation removed almost all the sulfate and partial pyrite from the raw coal, while ultrasonication was more effective in removing some low molecular-weight organic sulfur together with weakening the C-S bond in some sulfur species. The process of HCl-HF-HNO3 and stepwise treatment reduced the ash content and sulfur content to a larger extent, with ultrasonication after flotation and acid treatment having the highest sulfur removal from raw coal. The sulfur forms on coal surface were more modified after different pre-desulfurization processes, together with different sulfur transformations during pyrolysis. The accumulated amount of sulfur-containing gases during pyrolysis of coals after stepwise treatment, in particular of coals treated by the combination of flotation, acid washing and ultrasonication, generated the highest amount of sulfur-containing gases. For the utilization of high sulfur coals, in particular, of high organic-sulfur coals, the above-mentioned treatment of combination of traditional flotation technique and organic sulfur removal process should be considered, which could remove the inorganic sulfur and organic sulfur simultaneously, and release the most sulfur-containing gases during pyrolysis. Besides, it would be helpful to choose the utilization methods based on the sulfur species in raw coal, and the effect of pre-desulfurization process on sulfur transformation behavior.

Utilization of high-sulfur coals in CFB

Utilization of high-sulfur coals in CFB

97/04894 Pulse enhanced fluidized bed combustion: Mueller, B. et al. Proc. Annu. Int. Pittsburgh Coal Conf., 1996, 13, (1), 37–42

Various technologies are available for the combustion of high-sulfur, high-ash fuels, particularly coal. From performance, economic and environmental standpoints, fluidized bed combustion (FBC) is the leading candidate for utilization of high sulfur coals. ThermoChem, Inc., and the South Carolina Energy Research and Development Center (SCERDC) are installing a hybrid fluidized bed combustion system at Clemson University. This hybrid system, known as the Pulsed Atmospheric Fluidized Bed Combustor (PAFBC), will augment the University`s steam system by providing 50--60,000 lbs/hr of saturated process steam. The PAFBC, developed by Manufacturing and Technology Conversion International, Inc., (MTCI), integrates a pulse combustor with a bubbling-bed-type atmospheric fluidized bed coal combustor. The pulse combustion system imparts an acoustic effect that enhances combustion efficiency, SO{sub 2} capture, low NO{sub x} emissions, and heat transfer efficiency in the fluidized bed. These benefits of pulse combustion result in modestly sized PAFBC units with high throughput rates and lower costs when compared to conventional fluidized bed units.

A Review of: “Processing and Utilization of High-Sulfur Coals IV”. Edited by P. R. Dugan, D. R. Quigley, and Y. A. Attia; Elsevier, Amsterdam, 1991. $(US) 267.00

A Review of: “<i>Processing and Utilization of High-Sulfur Coals IV</i>”. Edited by P. R. Dugan, D. R. Quigley, and Y. A. Attia; Elsevier, Amsterdam, 1991. $(US) 267.00

Influence of Coal Quality Parameters on Utilization of High-Sulfur Coals: Examples from Springfield (Western Kentucky No. 9) Coal Bed: ABSTRACT

The Springfield (Western Kentucky No. 9) coal bed is the most important energy resource in the Western Kentucky coalfield (Eastern Interior coalfield), accounting for over 30 million tons of annual production from remaining resources of over 9 billion tons. For many coal quality parameters, the quality of the coal bed is relatively consistent throughout the region. For example, the Springfield has about 80-85% vitrinite, 10% ash, and 3.5-4.5% total sulfur at most sites in the coalfield. However, coal quality variation is more than just the changes in ash and sulfur. As demonstrated by the Springfield coal bed, it is a complex interaction of related and unrelated variables many of which directly affect utilization of the coal. Significant, though generally predictable, changes are observed in other parameters. Comparison of data from the Millport (Muhlenberg and Hopkins Countries), Providence (Hopkins and Webster Counties), and Waverly (Union County) 7{1/2} Quadrangles illustrated such variations.

A review of: “Y. A. Attia (Editor), Processing and Utilization of High-Sulfur Coals”, Coal Science and Technology 9, Elsevier, 1985, 787 p

A review of: “<i>Y. A. Attia (Editor), Processing and Utilization of High-Sulfur Coals</i>”, Coal Science and Technology 9, Elsevier, 1985, 787 p