National University of Science and Technology “MISiS” (Moscow, Russia):

S. V. Albul, Senior Lecturer, Dept. of Engineering of Technological Equipment, e-mail: albul@misis.ru
O. A. Kobelev, Dr. Eng., Professor, Dept. of Engineering of Technological Equipment
I. A. Levitskiy, Cand. Eng., Associate Professor, Dept. of Energy-efficient and resource-saving industrial technologies
A. G. Radyuk, Dr. Eng., Professor, Dept. of Metal Forming

It is known that the maximum heat losses in a water-cooled tuyere of a blast furnace are in the blowing channel. An effective way to reduce them is to install a heat-insulating ceramic insert. Heat-insulating inserts installed in the inner cup of air tuyeres for DP-5 of “Severstal” reduce heat losses through the tuyere by 30 %, and inserts, which, in addition, insulate most of the inner surface of the snout part, further reduce heat losses through the tuyere by 26,2 %. Using the method of mathematical modeling, the use a heat-insulating insert designs in an air tuyere of a blast furnace has been substantiated. The modeling was carried out using the Ansys software, the entire air tuyere, including the water-cooling circuit, was considered as the modeling object. To increase the durability of the heat-insulating insert and reduce heat losses through the blowing channel, it is justified to use an elongated insert with a thickness varying from 13 to 8 mm, which does not protrude into the blowing channel, having an angle between the normal to the side of the inner cup and the axis of the hole for natural gas supplying about 30°. It is shown that for the condition of more heat entering the furnace due to better combustion of natural gas in the blowing channel, the preferred option is with a short insert 10 mm thick, protruding into the blowing channel by 2 mm, and the axis of the hole for supplying natural gas perpendicular to the side of the inner cup.
Key words:

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