CS212083B1 - Nozzle mouth cooling fluid - Google Patents

Abstract

The invention relates to a liquid for cooling the mouths of nozzles installed in the bottom or side wall of metallurgical furnaces, where the nozzles serve to supply a quenching gas to a bath of molten metal and the liquid to cool the mouths of these nozzles, and where the liquid consists of an emulsion of water and liquid hydrocarbons.

Description

(54) Nozzle orifice cooling fluid

ANNOTATION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid for cooling the orifices of nozzles built into the bottom or side wall of a metallurgical furnace, wherein the nozzles serve to supply refining gas to the molten metal bath.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid for cooling nozzle orifices incorporated in a bottom or side wall of a metallurgical furnace for supplying refining gas to a molten metal bath, in particular a nozzle orifice for steel converters.

In the production of steel in the converter, during which the oxygen is introduced into the molten charge through the nozzles embedded in the bottom or side wall thereof, high temperatures at the nozzle orifices occur, thereby melting the nozzles and forming depressions around the nozzles in the converter lining. resulting in reduced converter life. In order to prevent the formation of high temperatures at the nozzle orifices, a coolant is fed into the molten charge together with the oxygen into the nozzle orifice which surrounds the oxygen stream, in particular gaseous and liquid hydrocarbons, water or steam, carbon dioxide, methane and the like.

Depending on the type of cooling medium used, its specific consumption and thus the intensity of the cooling effect vary. The specific consumption of these coolants also varies depending on temperatures and ranges from 3 to 10% of the oxygen supply, i.e. from 0.04 to 0.09 L per Nm ^{3 of} oxygen.

Although the specific consumption of coolant is relatively low, ways are being sought to replace both raw materials and energy-important media such as propane, diesel, fuel oils, natural gas, etc. with other less important media. For this purpose, tests were carried out with water, steam, carbon dioxide, etc., but this did not produce satisfactory results because, for example, using carbon dioxide requires the complex equipment necessary to keep the carbon dioxide in a liquid state until it is fed into the water. nozzles.

These disadvantages are overcome by the liquid for cooling the orifices of the nozzles built into the bottom or side wall of the metallurgical furnaces according to the invention, which consists of an emulsion of water and liquid hydrocarbons.

The advantage of the liquid according to the invention is that it reduces energy consumption, while cooling the orifice of the nozzles is as efficient as using liquid hydrocarbons alone, and that it does not require the use of complex machinery to supply it to the nozzle.

If the consumption of a liquid hydrocarbon, such as fuel oil, is 60 liters per tonne of steel at a consumption of 55 Nm ³ oxygen per tonne of steel, the emulsion consisting of 50% oil and 50% This means that the consumption of liquid hydrocarbons is reduced by about 40% while achieving the same cooling effect of the mouth, nozzles embedded in the bottom or side wall of the converter that surrounds the oxygen stream fed to the molten metal bath.

Claims (1)

Subject Liquid for cooling the nozzles in the bottom or side wall of metallurgical works The invention is characterized in that it consists of an emulsion of water and liquid hydrocarbons.