SU142655A1 - Blast Furnace High Temperature Nozzle - Google Patents

Description

High-temperature shielded nozzles of blast furnaces, made with heat insulating packing, with heat insulating unreinforced and reinforced coating, and others are known. Known nozzles can be used at a domain blast temperature of up to 1050 °. A further increase in the temperature of the blow is accompanied by a sharp increase in the resistance of the nozzles of known structures, due to the rapid oxidation of the metal at the points of the nozzle ball joints with flanges of the knee and tuyere.

The proposed nozzle allows to significantly reduce heat loss through the walls to radiation, eliminates the overheating of the nozzle casing and its deformation at the joints with the tuyere and the tuyere knee, and significantly increases the resistance of the nozzle at temperatures above 1000 ° C. The nozzle is made with water-cooled heads; the inner heat-insulating layer is made of foam-chamfer brick.

The drawing shows the proposed high-temperature nozzle.

The nozzle consists of a rear water cooled head 1, a casing 2, a pipe 3 for supplying water, an asbestos compensation layer 4, a lining 5 of foam chamfer, an anterior one cooled by water, a head 6.

As the lining of the nozzle, which provides a hot temperature to blow up to 1200 °, a foam chamotte is used, which has good thermal insulation properties (fire resistance of 1670 °).

Making the lining with separate bricks in the form of segments (section along A-A) prevents it from being destroyed by mechanical effects.

To compensate for thermal expansion of the lining, a layer of asbestos is provided between the casing and the lining.

No. 142655-2f. The front-and-nozzle heads are cooled with water. Cooling water enters the rear head 1, from where it goes through pipe 5 and directs 4tv5 to the front head 6.

I Water head cooling prevents the nozzle cover from deforming | , together with the tuyere and the tuyere knee and the flange of the tuyere tuft, are blown with hot air.

This increases the resistance of the nozzle at temperatures above 1000 °.

The manufacturing cost of the proposed high-temperature nozzle is reduced due to the exclusion of expensive alloyed steel for the manufacture of protective screens.

The nozzle was tested on blast furnaces of the Azovstal plant at temperatures of 1070-1100 ° and showed high performance.

The introduction of high-temperature nozzles on blast furnaces of the Soviet Union makes it possible to provide a temperature rise to blow up to 1200 °, resulting in an increase in the productivity of blast furnaces by 2-3% and a decrease in coke consumption by 3-4%.

The All-Union Research Institute of Metallurgical Heat Engineering in its conclusion notes the novelty and usefulness of the invention.

Subject invention

Claims (2)

1. A high-temperature blast furnace nozzle with an internal heat insulating layer, is entirely due to the fact that, in order to eliminate overheating of the nozzle casing, its deformation at the joints with the tuyere and tuyere, and to increase the service life of the nozzle, it is made with water-cooled heads. 2. A high-temperature blast furnace nozzle according to claim 1, characterized in that, in order to reduce heat loss through its walls and increase the life of the nozzle, the inner heat-insulating layer is made of foam-chamfer brick.