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Ceramic Recuperator Regenerator The Regeneration which is preferable for large capacities has been very widely used in glass and steel melting furnaces. Important relations exist between the size of the regener- ator, time between reversals, thickness of brick, conductivity of brick and heat storage ratio of the brick. In a regenerator, the time between the reversals is an important aspect. Long periods would mean higher thermal storage and hence higher cost. Also long periods of reversal result in lower average temperature of preheat and consequently reduce fuel economy. (Refer Figure 8.5). Accumulation of dust and slagging on the surfaces reduce efficiency of the heat transfer as the furnace becomes old. Figure 8.5 Regenerator Figure 8.4 Convective Radiative Recuperator The principal limitation on the heat recovery of metal recuperators is the reduced life of the liner at inlet temperatures exceeding 1100°C. In order to overcome the temperature limitations of metal recuperators,ceramictuberecuperatorshavebeendevelopedwhosematerialsallowoperationon the gas side to 1550°C and on the preheated air side to 815°C on a more or less practical basis. Early ceramic recuperators were built of tile and joined with furnace cement, and thermal cycling caused cracking of joints and rapid deterioration of the tubes. Later developments introduced various kinds of short silicon carbide tubes which can be joined by flexible seals located in the air headers. Earlier designs had experienced leakage rates from 8 to 60 percent. The new designs are report- ed to last two years with air preheat temperatures as high as 700°C, with much lower leakage rates. 8. Waste Heat Recovery Bureau of Energy Efficiency 179PDF Image | WASTE HEAT RECOVERY Classification
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