SU840116A1 - Blasting tuyere of blast furnace - Google Patents

Description

I

The invention relates to ferrous metallurgy, in particular to the production of iron in blast furnaces .;

A known blast furnace blast furnace comprising a cooled body, a natural gas supply pipe passed through it to the working channel and mounted in this channel with a gap relative to the internal wall of the body and a concentric shielding insert, the insert being perforated and adjoining its circumferential end to the front chassis parts ij.

A blast furnace tuyere is also known, consisting of a hollow flange lined from the inside of the body, the cavity of which communicates with the gas supplying tube and through evenly spaced holes with the tuyere channel, and on. The inner surface of the flange behind the holes is made with an annular trapezium projection 2.

However, these designs of blast tuyeres of blast furnaces have significant drawbacks and, therefore, are not widely used - their design does not provide for deep penetration of gas into the flow of blowing and mixing it with blowing.

The closest to the invention to the technical essence and the achieved result is a blast tuyere burner for a blast furnace containing a water-cooled body, in the working channel of which a heat-resistant screen is placed, which forms an annular gap with the body through the gas supply channels of the ЗЗ.

But . Such a design of the tuyere n eliminates the indicated drawbacks.

Claims (3)

The purpose of the invention is to develop such a design that provides chorus C1 (one-way gas flow with blast, reduced heat loss to blow with cooled lance water, preheat the gas before supplying it to the blast, yBrniny e sth), and increase the efficiency of using natural gas flOMeHHoii stoves. The goal is achieved by installing a heat barrier Hbrfi screen with a ring gap between the screen and the inner wall of the tuyere, 1/3 of its length from the flange, and the heat-insulating layer between the metal rings at both ends of the tuyere is fixed to the rest of the working channel moreover, against the annular gap created by the screen, a guide ring was fixed, provided with a recess, which created a countercurrent of gas, directed it to the center of the tuyere burner, and on the tip of the tuyere burner was fixed a stop ring for mounting heat insulating layer. FIG. I shows a general view of the tuyere in longitudinal section; in fig. 2 - guide ring, view from the gas guide recesses; in fig. 3 - the same cross section of the ring. consists of a water-cooled body 1, which is bolted to it through a sealing gasket of the outer flange 2 with ball sharpening for articulation with a tuyere nozzle; a pressure flange 3 is fastened inside the water-cooled body. provided with openings for a water supply pipe 6, drainage and gas supply pipes (not shown in the drawings). The openings of the gas supply pipe are connected to the gas supply channels 7, ending with the gas supplying holes 8 of the slit shape. A heat-resistant screen 9 is fastened to the outer flange, which enters into the working channel of the tuyere 1/3 of its length from the flange and forms an annular gap Yu. V with the tuyere body. The annular gap leaves the gas supply holes drilled in the outer flange. A guiding ring II is fixed in the outlet opening of the annular gap, provided with an annular groove 12 and transverse grooves 13. The screen and the collar form openings for the gas to escape from the annular gap. The undercuts in the ring direct the gas against the flow by blowing at an angle of 40 ° -5 ° to the lance axis. At the end of the working channel of the tuyere, a ring 14 is stiffly fixed to hold the heat insulating layer 15. strengthened between the guide and the stop rings. 64 Gas into the blast is supplied through a gas supply pipe through the outer flange 2, the gas supply channels 7 of which are gas. through the gas supply, slit-shaped holes 8. enters the annular gap H under the heat-resistant screen 9, where the gas is heated by the heat blown through the screen 9, increases in volume, hits the guide ring 11, turns around the ring notch 12 in the opposite direction and goes through the recesses 13 to the working lance of the tuyere at an angle of 40-50 ° to the axis of the tuyere, it is well crossed with the blast and fed into the furnace. The gas has a low temperature, which is -20 ° C in wintertime. Consequently, entering under screen 9, the gas cools the water in the body of the tuyere and is heated by blast and cooling water. Thermal insulation layer 15 prevents the loss of heat from the cooling water. The screen 9 allows you to utilize the heat transferred to the cooling water through the body of the tuyere, transfer it to gas and send it to the furnace. The tuyere burner reduces heat loss with cooling water, increases the actual temperature of blowing, improves gas displacement with blast, improves the use of gas in the blast furnace, reduces the consumption of coke for the production of pig iron, and increases the productivity of the furnace. DETAILED DESCRIPTION OF THE INVENTION A blast furnace for a blast furnace, comprising a water-cooled body, in the working channel of which a heat-resistant screen is placed, forming an annular gap with the body, connected with holes to the gas supply channels, so that natural gas supplied to the furnace, and improving its mixing with blast, it is equipped with a guide ring made with annular and transverse guide grooves located opposite the annular gap at a distance of 1/3 of the working length his lance channel. Sources of information taken into account in the examination 1. USSR author's certificate number 404852, cl. From 21 to 7/16, 1971. 2. USSR author's certificate number 458581, cl. From 21 to 7/16, 1972. 3. Author's testimony of the USSR N 142315, cl. From 21 to 7/16, 1961, Fy f3 13