On the problem of utilization of carbon dioxide in waste gases of power plant boilers when burning high-ash coals

Abstract

The production activity of mankind using high-ash fossil fuels for electricity generation is steadily increasing ash waste and carbon dioxide emissions into the environment. The article proposes a variant of wasteless combustion of Ekibastuz coal in a melting reactor installed under the boiler; it is envisaged to obtain, in addition to steam of energy parameters, a melt suitable for the production of building materials, sublimates of zinc, gallium and germanium, to reduce emissions of " СО2" into the atmosphere and return to the process a part of carbon in " СО2". An energy-saving thermal diagram of a power plant boiler has been developed on the basis of the proposed technology for the reduction of " СО2, Н2О " of reactor waste gases with zinc vapor to " СО, Н2". The resulting excessive hydrogen will be used to displace elemental carbon from "CO". The spent reagent, zinc oxide, after recovering into zinc will be used again in the process. In case of implementation, CO2 emissions into the atmosphere will be cut up to 50%, the expected payback period of the proposed system will be 1.0 - 1.5 years.