Review on Mineral Matter Transformations and Slagging in Pulverized Coal Combustion

摘要

In the report a survey is presented of the transformations that the mineral matter in coal undergoes during combustion. Starting point of the study was an IEA inquiry on boiler performance and failure in pulverized coal-fired power stations. It was found in the inquiry that the formation of slag depositions, caused by the deposition of mineral material in boilers, is the most troublesome operational problem in such installations. The present knowledge on slagging is poor. Standard laboratory tests on slagging do not simulate actual boiler slagging conditions. The relative success of the tests promote the idea that such a simulation exists. Most knowledge pertains to slag build-up on metal heat-exchanger tubing. Enrichment of elements in slags is not accounted for in standard slag tests. The slagging potential of coal mixtures is not adequately tested. It is questionable whether the standard test methods apply in case of combustion modifications.