| 摘要 |
The present invention provides a method of reducing iron ores into pig iron in a shaft furnace, especially a blast furnace, wherein coke and oil (e.g., fuel oil) are used as the reducing agents and the oil is added through at least one pipe having a nozzle head to the blast furnace blast air heated to a high temperature and being blown into the blast furnace via a blast tuyere, whereby said pipe and said nozzle head, at least in portions thereof, are subjected to the high temperature of the blast air supplied to the blast furnace, said method comprising continuously controlling the ratio of the added volume of the oil relative to the introduced volume of the blast air in response of the respectively existing value of the volume of the blast air, defined e.g. as a differential pressure volume measurement, and, when the injected oil volume is reduced to below a predetermined minimum volume, adding or admixing, in a controlled manner, to the oil prior to its entry into the thermally stressed portion of the pipe, a liquid coolant, e.g., water, for the cooling of said pipe in such a manner that the total amount of the oil and of the coolant even in the case of a further reduction of the volume of oil added ensures a cooling effect which safely prevents clogging of said pipe by setting or stopping of the flow of the oil due to temperature influence.
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