This is the final report for interagency Agreement DE-AI22-87PC79660 on "Combustion Test" for vortex combustor (VC) development for commercial applications. The work culminated in the. successful demonstration of a 2 MB/H proof-of-concept (POC) model firing coal-water fuel (CWF). This development is concerned with a new concept An combustion, and there is a general %ack of relevant information. The work therefore began (in addition to the companion cold flow modeling study) with the design and test of two subscale models (0.15 and 0.3 MB/H) and one full scale model (3 MB/H) to obtain the needed information. With the experience gained, the 2 MB/H POC model was then designed and demonstrated. Although, these models were designed somewhat different from one another, they all performed well and demonstrated the superiority of the concept. In summary,°test results have shown that VC can be fired on several coal fuels (CWF, dry ultrafine coal, utillty grind pulverized coal) at high combustion efficiency (>99%), high firing intensity (up to 0.44 MB/H-ft3), and at temperatures sufficiently low for dry ash removal. The combustion process is completed totally inside the combustor. Conventional combustion enhancement techniques such as: preheating (air and/or fuel), pre-combustion, and post combustion are not needed. t V ,. LI|T OF TJklmlJ_8 1.i Performance requirements and design goals for the VC ....

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