Ceramic candle filters are currently being developedfor removal of part iculates from hot flue gas. Commercializationof this technology will be enhanced and accelerated if the candlecosts can be reduced. Cost is especially important forpressurized fluidized bed combustion plants because of the largenumber of candles needed. Substantial cost reductions arepossible by the use of an innovative method of fabricatingceramic co mponents, called self-propagating high-temperaturesynthesis (SHS). Hot-gas cleanup is a growing need throughoutmost of the world, and successful implementation of SHS in thisapplication will present substantial export potential. SHS isbased on exothermic chemical transformations in powder media.Ignition of a powder mixture in a vessel produces aself-sustaining combustion wave. Reaction occurs in thecombustion wave resulting in the synthesis of the materials inthe mixture, eliminating the need for firing in kilns. Shapes canbe fabricated to final dimensions in a short time. SHS reducesthe processing and quality control costs, which are significantfor ceramic components, SHS also provides control of porosity,making it especially suited to manufacturing filters. Phase Ifocuses on identifying materials suitable for hot gas cleanupsystems using SHS. Material samples will be fabricated and testedfor filter performance. The feasibility of manufacturingfull-size filters using SHS will be determinedAnticipated Results/Potential Commercial Applications as described by the awardee: It is expected that several importantresults will be derived from the project when successfullycompleted. Ceramic candles made by the SHS innovative fabricationtechnique will be commercially available for sale to usersworldwide. These candles will have high filtration efficiency,low cost, and long life. They will be available in differentmaterials to provide the most cost effective systems for aparticular application. Sales will be to manufacturers of hot-gascleanup systems, to chemical, waste disposal, incineration, andmetallurgical industries, and to any industries where hightemperature gas filtration will improve process efficiency andreduce emissions.
