RU2034033C1 - Apparatus to protect and cool blast-furnace stack - Google Patents

Abstract

FIELD: ferrous metallurgy. SUBSTANCE: apparatus has collector 1 with pipelines 2, that are introduced in clearance 3, formed by stack shell and plate-type coolers 5 in lower part of stack, in zone of maximum heat loadings on plate-type coolers. Clearance over and below the zone is filled with fire-proof mastic 6 ( or back fill), using common process during blast-furnace erection. Clearance is connected with gas-conducting passages 7, made inclined in fire-proof lining. Along all the height of clearance vertical partitions 8 are mounted, dividing it for ring-type sections. Arc of each section embraces 2 - 4 coolers. Pipelines, that are feeding cooling gas to ring-type sections of clearance, are provided with adjusting device 10. Device feeds cooling gas into working space of blast-furnace, in which ring-type stream with lower temperature is formed. The stream, going up along fire-proof lining, lowers temperature of furnace gas on its contact surface and so lowers chemical activity of charge liquid members interaction with fire-proof material. Cooling gas, passing through clearance, additionally cools furnace stack shell. EFFECT: apparatus to protect and cool blast-furnace stack is used in ferrous metallurgy. 2 cl, 2 dwg

Description

 The invention relates to ferrous metallurgy, in particular to a device for cooling a shaft of a blast furnace.

 A known method and device for preventing overheating of the inner surface of the working space of metallurgical furnaces, in which the cooling medium is blown through tuyeres having only lateral outlets, and moving along the walls of the refractory lining serves as a protective shield against hot gases, and when mixed with hot gases reduces the gas temperature at refractory lining walls.

 A disadvantage of the known device is the need to install special tuyeres with side outlets for supplying a cooling medium.

 The closest in technical essence to the claimed device is a device selected to increase the durability of cooling plates of blast furnaces, selected as a prototype, containing a collector (ring pipeline) connected to pipelines evenly distributed around the furnace through the furnace wall, through which gas is blown into the furnace, creating level of cooling plates, protective ring flow with reduced temperature.

The disadvantages of the known device are:
insufficient use of cooling gas to cool the elements of the furnace shaft,
the impossibility of regulating the intensity of the cooling of the furnace shaft when local zones with increased heat load appear when the furnace course is disturbed.

 The presence of a large number of pipelines passing through the wall of the furnace complicates its lining.

 The aim of the invention is to increase the life of the shaft of the furnace by creating additional cooling of the refractory lining and the casing of the furnace, the ability to control the intensity of cooling of local zones with increased heat load and simplify the design of the device.

 This goal is achieved by the fact that in the device for protecting and cooling the shaft of the blast furnace, containing an annular manifold with pipelines, they are introduced into the gap formed by the casing of the shaft and plate coolers in the lower part of the shaft in the zone of the highest heat loads, the gap is connected by gas-tight passages to the working space furnace, and along the entire height of the gap installed vertical partitions that divide it into annular sectors.

 Comparison of the claimed technical solution with the prototype made it possible to establish compliance with the criteria of the invention of "novelty."

Comparison of the claimed solution not only with the prototype, but also with other technical solutions in this technical field did not allow us to identify in them the features that distinguish the claimed solution from the prototype, which allows us to conclude that the criterion of "significant differences"
In FIG. 1 shows a device for protecting and cooling a shaft of a blast furnace, a vertical section, FIG. 2, section AA in FIG. 1.

 A device for protecting and cooling a mine blast furnace shaft contains an annular collector 1 with pipelines 2, which are introduced into the gap 3, formed by the casing of the shaft 4 and stove refrigerators 5 in the lower part of the mine in the zone of the highest thermal loads on stove refrigerators. And the gap above and below this zone during the installation of the blast furnace is filled with refractory mastic 6 (or backfill) according to conventional technology. The gap (not filled with refractory mastic) is connected to the working space of the furnace by gas permeable passages 7 made oblique in the refractory lining 8. To create an even distribution of cooling gas along the contour of the shaft lining, plate coolers can be made with gas permeable passages 7.

 Along the entire height of the gap, vertical partitions 9 are installed dividing it into annular sectors. The arc of each sector covers 3-4 refrigerators. Pipelines 2 supplying cooling gas to the annular sectors of the gap are provided with a control device 10.

 A device for protecting and cooling a mine blast sword operates as follows.

 Cooling gas, for example, blast furnace gas, is supplied under pressure greater than the gas pressure in the blast furnace through the manifold 1, pipelines 2 into the annular sectors of the gap 3, through which it cools the furnace cover 4. From the gap, the cooling gas enters the working space through gas-permeable passages 7 furnace, forming an annular stream with a reduced temperature, which rising along the refractory lining 8 lowers the temperature of the furnace gas on its contact surface and thereby reduces the chemical activity of the interaction of the liquid components of the shea refractory materials.

 Automatically, according to the temperature sensors (not shown in the drawing), the regulating devices 10 make it possible to supply more cooling gas through pipelines 2 to that annular sect of gap 3, whose local zone of the mine is affected by the highest thermal load when the furnace is disturbed.

 Using the proposed device will increase the life of the blast furnace between overhauls by increasing the life of the shaft of the furnace, the resistance of which will increase due to additional cooling of the furnace shell, as well as reducing the chemical activity of the interaction of the liquid components of the charge with the material of the refractory lining.

 Using the proposed device will allow you to automate the regulation of the cooling intensity of specific local zones, which, when the furnace is disturbed, is affected by the highest temperature, which will reduce the total flow of cooling gas and increase the efficiency of the additional cooling circuit.

Claims (2)

 1. DEVICE FOR PROTECTING AND COOLING A DOMAIN FURNACE SHAFT, comprising a casing with plate coolers and an annular collector with pipelines, characterized in that the casing and plate coolers in the lower part of the shaft form a gap into which pipelines are introduced, while the gap is connected by gas-permeable passages to the worker the space of the oven.  2. The device according to claim 1, characterized in that it is equipped with vertical partitions installed along the entire height of the gap and dividing it into annular sectors.

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