Annular Vortex Combustion (AVC) Development for Space/Water Heating Applications

This is the final report for Annular Vortex Combustor AVC development for commercial applications. The work culminated in the successful demonstration of a 2-MBH proof-of-concept POC model firing coal-water slurry fuel CWF and dry pulverized coals. This development was concerned with a new concept in combustion for which there was a general lack of relevant information. The work began with a cold flow modeling study and with the design and test of two subscale models 0. 15 and 0. 3 MBH and one full-scale model 3 MBH to obtain the needed information. With the experience gained, the 2-MBH 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 AVC can be fired on several coal fuels CWF, dry ultrafine coal, utility grind pulverized coal at high combustion efficiency 99 percent, high firing intensity up to 0.44 MBH-ft3, and at temperatures sufficiently low for dry ash removal and in-situ pollution abatement. The combustion process is completed totally inside the combustor. Conventional combustion enhancement techniques such as preheating air andor fuel, precombustion, and post-combustion are not needed.