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Show by heat exchange with room-temperature air. N K K Keihin Works employs three ladle heating systems, two of which have been modified to use the regenerative burner. W e took the following considerations into account before applying the regenerative burner to the ladle heating system. (1) The existing ladle heating system is to be utilized as much as possible in order to minimize equipment costs. The existing air blower for combustion, pipelines for combustion air and C O G , flow meters, and ladle cap swivel/elevator, as well as part of the flue are to be used. Since the use of the light-weight honeycomb regenerator increases the total weight of the cap and burners by only 0.7 ton, the weight of the ladle heating system increases from 2.6 tons to 3.2 tons. The existing swivel/elevator can therefore still be used. (2) The temperature of the ladle should be controlled. For this purpose, control thermometers are to be installed on the ladle cap, and the flow of C O G is to be adjusted, after the set temperature has been reached, using the TIC (temperature indicating controller) in order to keep the ladle at the target temperature while reducing fuel consumption to enable energy conservation. Operating Conditions for the Regenerative Burner Ladle Heat ing System Performance of the regenerator W e measured the temperature of the flowing gas by installing thermometers before and behind the regenerator in order to confirm the performance of the regenerator. Temperature changes with the passage of time are shown in Fig. 3. A burner is burning during the time period from 0 to 30 s, and the temperature on the high-temperature side (burner nozzle side) corresponds to the temperature of preheating air. Since the set temperature is 1270K, the regenerator is also 4 |
