Abstract
Mixed gas of liquefied natural gas (LNG) and oxygen was injected into the vacuum vessel during non-decarburization period using a multifunctional lance. Tthis study reports the experimental results when applying this process in a 100-ton piece of equipment and reports the changes in temperature of the refractory surface and molten steel. Using a multifunctional lance allowed heat supplementation by injecting LNG-oxygen mixed gas into the vacuum vessel of a RH device and then burning the gas near the outlet of the injection nozzle. The following was found: The minimum surface temperature required so that the skull would not adhere to the RH vessel was calculated as about 1643K (1370°C). When the interior of the RH vacuum vessel was preheated with a multifunctional lance so that the temperature would be higher than this, skull adhesion to the vessel did not occur. Calculation of heat balance for burning under atmospheric pressure showed that about 70% of the heat quantity of burning was supplied to the refractory. When mixed gas was burned during the RH process, it was shown from the temperature change of molten steel that about 52% of the burning heat was transferred to the steel. Heat quantity removed through lance cooling water was proportional to the charge length of the lance, and emissivity E was equivalent to heat transfer quantity of 0.38.
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