By Karin Oskarsson
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Extra info for A planner's guide for selecting clean-coal technologies for power plants, Volumes 23-387
More often, less costly control systems will have to be employed. Typical decisions to be made by planners and engineers are whether to implement 95 percent sulfur removal at a prohibitive cost, 70 percent sulfur removal at modest cost or no control at all. Important factors in this equation include coal quality, power plant and mine location, local air quality standards, ambient air quality conditions, and waste transport and disposal. Few analytical tools exist to assist power sector planners and engineers in such a complex exercise.
The methods themselves are described in Appendix 1: Gravity based: · Jigs, · Dense-medium separators, · Hydrocyclone, · Flowing film, and · Concentration table. Surface property based: · Froth flotation. Dry methods: · Cleaning coarse coal with a fluidized air dense-medium. Page 14 Cleaning processes produce effluents such as wastewater and solid residues. 5 gives an example of how quantities and concentrations of effluents vary for different methods. 5: Effluent from coal cleaning Source: Couch (1995a).
Recently burners with NOx emissions less than 400 ppm have been developed. In China, more than 20% of the power plants use some kind of low NOx combustion, most are low NOx burners. SCR and SNCR technologies for low NOx emissions are not in use in either country. Particulate Emission Control Technologies Particulates can be removed with a great degree of efficiency either in electrostatic precipitators (ESP) or in baghouse filters. ESPs are used in all large plants in India and in most Chinese plants, while fabric filters (baghouse) are extremely rare.
A planner's guide for selecting clean-coal technologies for power plants, Volumes 23-387 by Karin Oskarsson