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storage ratio of the brick. The time span between the reversals is especially important because long periods would mean higher thermal storage and hence higher cost as well as lower average temperature of preheat and consequently reduction in the fuel economy. Accumulation of dust and slag on the surfaces reduce efficiency of heat transfer as the furnace becomes old. Heat losses from the walls of the regenerator and air in-leaks during the gas period and out-leaks during the air period also reduce the heat transfer. Exhibit A-4: Large Regenerative Heat Recovery System Used in Glass and Steel Industries Regenerators offer higher heat recovery efficiency compared to recuperators. However, they use considerably larger surface area, are much more bulky, and require more frequent maintenance. Regenerative Burners Regenerative burners are a special class of regenerator that is attached to a pair of burners. The regenerator attached to a burner is much smaller in size, uses small ceramic pebbles or shapes, and requires more frequent cycling than that for a large regenerator. Typically, these systems offer 60%–80% heat recovery efficiency and require cycling every 20 seconds or less. This is almost 50 times more frequent than that of the large recuperators. Exhibit A-5: Regenerative Burners for Medium to Small Furnaces These burners are used for high-temperature furnaces, such as aluminum melting furnaces, forge furnaces, or steel reheating furnaces. Cost of these units is 2–3 times higher than the normal recuperator Industrial Waste Heat Recovery Page 47PDF Image | Industrial Waste Heat Recovery: Potential
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