The purpose of the report is to evaluate certain combustion systems which are designed to make use of high ash, high sulfur reject materials from coal cleaning by means that will generate steam and permit the recovery of sulfur value. Specific compositions of the rejects were not pre-defined. Specifications of the fuels derived from the rejects ('HSC Fuels') have been developed to accommodate the economics or technical limitations imposed by the processes selected. The scope of the analysis includes both general and specific design considerations in the following order: The HSC Fuel characteristics as determined by variables in composition; Suitability of currently available combustion systems to the proposed boiler design; Specification of the HSC Fuel characteristics required by each combustion system and selection of the combustion system best suited to the process; Preparation of conceptual boiler designs and cost estimates for a 500,000 lb/hr. industrial boiler, a 500 MW (megawatt) utility boiler, and a prototype boiler design at 50 MW capacity. Tests and procedures fo verifying the HSC Fuel characteristics are recommended. The commercial-scale and prototype designs are developed and cost-estimated according to normal proposal standards. (Author)