Whenever coal is burnt, ash is produced by the thermal transformation of the mineral matter present. Large-scale uses of coal, such as power generation, give rise to significant quantities of ash and a number of uses for this by-product have been developed over time.
During the last two decades a number of changes have occurred in the coal-fired power generation sector that have affected ash production, and trends for the future use of coal are likely to have a continuing impact on ash in respect of quality and quantity. These changes include: the increasingly common practice of cofiring coal with other non-coal fuels, especially biomass; modifications to coal-fired power generation plant to reduce emissions (in-boiler and post combustion); the development of more fuel-efficient and more operationally flexible boiler plant; and fundamental changes to the basic combustion process to prepare for carbon-capture technologies (for example oxyfuel combustion).
This report reviews the impact of these developments on ash production and ash properties, and the implications for the more important utilisation routes.
Title: Non-calcium desulphurisation technologies, CCC/170
Author(s): Dr Qian Zhu
ISBN: ISBN: 978-92-9029-490-0
Publication Date: 01/06/2010