SU1145031A1 - Method of drying blast furnace lining - Google Patents

Abstract

METHOD FOR DRYING THE DOMAIN FURNACE lining, including heating the lining by supplying a gaseous heat carrier to the furnace cooling system, characterized in that, in order to increase the duration of blast furnace overhaul periods and shorten the repair time, the lining of the furnace floor is first dried by supplying the heat carrier with temperature 260 450 ° C into the air-cooling system of the floor, with the ETL during the first 2-3 days, the coolant is fed with an intensity that provides a specific heat flux of 3000 to 4000 W / m s leduyuschim Etch) withdrawn (A cheniem to 5000-7000 watts / m-.

Description

41

SP

one .

The invention relates to metallurgy, in particular to the secondary production, and can be applied in shaft furnaces of nonferrous metallurgy.

A known method of drying the blast furnace lining, which includes the supply of coke oven gas and hot blowing through the tuyeres, until the moisture content reaches 2-3% for 0 days 1}.

The disadvantages of this method are the low durability of the furnace lining and the increased repair duration.

There is also known a method of drying the blast furnace lining, which includes heating the lining by supplying hot water or steam to the cooling system. For drying the furnace lining for 6 hours, water with a temperature of C2 J is supplied to the cooling system.

The disadvantage of this method is the low efficiency of the drying process of the furnace, due to the low temperatures of the coolant and the flow rate of the coolant, not exceeding 0.2 t / min, which leads to an increase in the duration of the drying process of the lining.

The closest to the proposed by the technical essence and the achieved positive effect is the method of drying the refractory lining of the blast furnace, which includes heating the lining by supplying the gaseous heat carrier gas 1 to the cooling system of the furnace.

The disadvantage of this method is the low efficiency of the drying process due to the low temperature of the coolant and the short duration of its supply, which leads to a reduction in overhaul periods, as well as an increase in the period of repair due to the cessation of work during the supply of coolant.

The purpose of the invention is to increase the service life of the turnaround time between blast furnaces and shorten the repair time.

This goal is achieved by the fact that according to the method of drying the lining of a blast furnace, which includes heating the lining by supplying a gaseous heat carrier to the furnace cooling systems, first, the lining of the furnace floor is dried by supplying the heat carrier with a temperature

45031 1

26 () - 450С to the air cooling system of the bottom, while during the first 2-3 days the coolant is supplied with the intensity that provides

, the specific heat flux is 3000–4000 W / m with its subsequent increase to 5000–7000 W / m.

Supply of gaseous coolant with a temperature of less than 260s at

JQ of the existing flow rates of coolants (air cooling) does not provide the intensity of the specific heat fluxes of Bbmie 2000 W / m, which leads to an unjustified prolongation of the drying time of the bottom layer. The supply of gaseous coolant with a temperature of over 450 ° C is unacceptable due to

, reducing the strength properties of the metal of the podleschalnogo cooling 2Q refrigerators to dangerous limits.

The need for the introduction of drying stages is caused by different tolerances of the intensity of heat supply to the leveling layer of heat-resistant concrete and blocks (graphitized and carbon).

When drying the leveling layer, the flow of the coolant into the system ensures the specific heat flow is less than 3000 W / m for

0 less than two days, realizable lining heating rate does not ensure complete removal of moisture, so the subsequent transition to the intensity of the specific heat flux

5 cBbmie 4000 W / m leads to high thermal stresses, which can cause a discontinuity of the layer.

Supply of heat carrier, providing a specific heat flux of 3000-4000 W / m, for more than three days simply lengthens the duration of complete drying and increases energy costs, without improving the quality of drying of the layer of heat-resistant concrete.

After drying of the leveling layer with the beginning of intensive heating of the blocks, the flow of the coolant, providing a specific heat flux

less than 5000 W / m, does not fully realize the possibility of intensifying the heating of the lining and, as a result, leads to an increase in the drying time. The supply of heat carrier, which provides a CBbmie heat flow of 7000 W / m, leads to an increase in thermal stresses not

Claims (1)

METHOD FOR DRYING A LINE OF A DOMAIN FURNACE, comprising heating the lining by supplying a gaseous coolant to the cooling system of the furnace, characterized in that, in order to increase the duration of the overhaul periods of the blast furnaces and reduce the repair time, the lining of the furnace bottom is first dried by supplying a coolant with a temperature of 260-450 ° C in the air cooling system of the bream, while during the first 2-3 days the coolant is supplied with an intensity that provides a specific heat flow of 3000-3 4000 W / m ² followed by a hundred increase to 5000-7000 W / m '. SU „, 1145031 1 ' . 1