SU1065479A1 - Blast furnace air heater - Google Patents

Description

ABOUT)

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CO f, 1 The invention relates to metalshlgium, in particular to the designs of blast furnaces,. and can be applied in all sectors of the national economy where high temperature heating is required. Blast furnace air heaters are known, comprising a casing, a refractory lining, a dome, combustion chambers and nozzles, hot and cold choke fittings embedded in the ClJ refractory lining. A disadvantage of the design of air heaters is the low resistance of the refractory arches of hot, cold-blown gas burners and flue nozzles in their connection to the air heater. The air heater of the doyunny furnace is also known, which contains a device for maintaining brick wall cladding of air heaters lined up vertically from separate refractory bricks and covered outside by a metal casing, to which brackets with metal polkalsh welded with a brick wall are welded in the inlet area of the fittings, as well as part of the forces that occur during thermal expansion and directed vertically downwards. The disadvantage of this design is that the air heater is low. The resistance of the metal casing in the vicinity of the inlet of the choke pipe is hot, due to the presence of elevated temperatures in this area, as well as the loosening of cochcha in the places where the brackets with shelves are welded, to perceive the weight and thermal expansion of the refractory wall deforming the air heater casing. The closest to the proposed technical performance and the achieved result is the air blower of the blast furnace, which contains a casing, a refractory lining with cylindrical openings into which fittings, a dome, combustion chambers and nozzles are embedded, Cz. A disadvantage of the known design of the blast furnace air heater is that the arch, precluding from the destruction of the arch of the openings in the chamber of the air heater, is made in the form of an angular arch, which perceives only the vertical loads of the weight of refractory bricks and the warmth of the vertical expansion of the bricks directed vertically downwards. The purpose of the invention is to increase the efficiency of heating by blowing by increasing the durability of the lining. The goal is achieved by the fact that in the air heater, domain 79 of the furnace, containing a casing, a dome, combustion chambers and nozzles, a refractory lining with cylindrical openings in which nozzles are embedded, under the aperture the refractory lining is made with ledges with an increase in the height of the lining exit end fittings in the air heater chamber 0.1 - 0.01 lining diameter of the air heater chamber. A reduction in the outflow of 0.01 values of the lining diameter does not provide an optimal stress-deformed state of the joint assembly of the lining of the nozzle with the lining of the combustion chamber, makes it difficult to make closed vertical rings of refractory bricks of the nozzle, and an increase in the outflow of 0.1 of the diameter of the lining of the chamber does not contribute the further improvement of the stress-strain state of long-term operation of the joint of the lining of the nozzle with the chamber lining leads to an increased consumption of refractories. FIG. 1 Picasan blast furnace air heater, general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; figure 4 - section bb In fig. 3. The blast furnace air heater consists of a metal casing 1,. inside which there is a refractory lining of 2 combustion chambers 3 and nozzles 4, united by a common dome 5. Horizontal refractory lining 2 has horizontal cylindrical openings b in which fittings 7 are hot, cold blowing, gas burners and smoke with cylindrical arc / and masonry 8 The output end of the cylindrical arches 8 of the choke 7 is covered from the lower part by horizontal semi-cylindrical rings 9, which are made with ledges with an increase in the outlet upwards and into the internal cavity of the chamber 3 and 4 of the air heater. The output end of the cylindrical arches masonry 8 fitting 7 made with high in the chamber 3 and 4 air-heating. the bed is 0.1-0.01 lining diameter values for 2 chambers 3 and 4 air heaters. Air blast furnace works as follows. When the blast furnace air heater is operating in the Nozzle heating and Heating blowing mode, thermal expansion of the refractory lining bricks 2 and cylindrical arches of the cladding 8 lining of the choke 7 of chambers 3 and 4 takes place, which are perceived by horizontal semi-cylindrical rings of the 9 lining, which are made with an increase in height of the lining upwards and into the internal cavity

chambers 3 to 4 air heaters. By creating an optimal for the duration of the continuous work of the stress-strain state of the refractory lining of the semi-cylindrical rings 9 of the supporting refractory arch, the latter perceives not only the weight of the rows of refractory lining 2, the strength of the vertical thermal expansion of the refractory bricks, but also the strength of the thermal expansion. the destruction of the refractory bricks of the ridge arch of the semi-cylindrical rings 9 of the lining 2. Thus, the laying of 8 fittings 7 / embedded in the openings b is not destroyed.

The lining of the outlet end of the lining of the fitting 7 in X1Measure 3 and 4 of the heater is 0.1-0.01, the diameter of the lining 2 chambers 3 and 4 provides the optimum for the duration of work stress-deformed semi-cylindrical refractory rings 9 made of ledges , with an increase in the vysova into the internal cavity of the chambers 3 and 4 of the air heater. .

The application of the proposed technical solution in comparison with the base object makes it possible to increase the resistance of the combustion chamber by 20–30% and also to provide an increase in the thermal power of the air heater with a decrease in temperature to blow 25–40 s.

An increase in the resistance of the combustion chamber makes it possible to increase the time between repairs from 8 to 10 years.

Increasing the blast temperature by 25 ° G reduces the specific consumption of coke s in blast furnace smelting by 4.0 kg / t of pig iron.

Claims (1)

(5 7.) A DOMAIN FURNACE AIR HEATER containing a casing, a dome, combustion chambers and nozzles, a refractory lining with cylindrical openings in which fittings are integrated, which differs in that, in order to increase the efficiency of heating the blast by increasing the durability of the lining , under the opening, the refractory lining is made with ledges., with an increase in the height of the outlet end of the lining of the nozzle’s, the air chamber ”. heater for 0.1-0.01 diameter of the lining of the heater chamber.