| 摘要 |
a combustion room having a gas burner for obtaining a burned gas with a fuel and air; a boosting transformer provided in the rear of the combustion room and selectively spraying air or steam to the burned gas of a high temperature; a shutter provided on the upper part of the boosting transformer and selectively discharging the mixed gas; and a slot and jet nozzle provided in the rear of the boosting transformer.
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