RU2088670C1 - Cooled apparatus for supporting masonry of upper non-cooling part of shaft - Google Patents

Abstract

FIELD: metallurgy, namely blast furnaces. SUBSTANCE: cooled apparatus for supporting masonry of upper non-cooling part of shaft of blast furnace includes horizontal bracket and supporting plate secured to said bracket. Length value of horizontal bracket is equal to doubled distance between axles of cooled brackets of shaft. Places for feeding and removing water out of supporting brackets are shifted relative to brackets of shafts by pitch half. EFFECT: improved design. 3 dwg

Description

 The invention relates to metallurgy, in particular to blast furnaces.

 The purpose of the invention is to increase the service life of the refractory masonry located in the uncooled part of the shaft of the blast furnace.

Known bracket refrigerators for supporting the masonry of the upper part of the shaft, made of a cast iron body and bent steel pipes embedded in it [1]
The disadvantage of this design is:
lack of a continuous surface for masonry, so between the individual brackets the masonry collapses:
insufficient reliability of the structure, since during their manufacture (casting) the steel tubes are carbonized, made brittle and lose strength.

 Closest to the invention is [2] a prototype. In the prototype for supporting masonry in the uncooled upper part of the shaft, a support protrusion is proposed.

 The support protrusion consists of a horizontal support sheet welded to the support pipes. The support pipes are made in the form of bent brackets; they are arranged vertically and form a bracket on which the support sheet rests. Additionally, for strength, scarves are provided that are welded to the casing and the backing sheet. The text of the copyright certificate [2] states "Each of the adjacent cooled tubular support elements is connected to a separate circulation circuit, which increases the degree of reliability of the device (for example, in case of clogging (disconnecting one of the circuits, the second is reliably cooled).

This device has inherent disadvantages:
All holes of the vertical brackets are located at the same level, which leads to excessive weakening of the casing.

 The failure of one of the brackets of the vertical row often leads to the disconnection of the entire vertical chain of brackets. When two adjacent chains are disconnected, the horizontal plate loses its support and collapses, with a part of the masonry supported on it.

 Therefore, this design cannot be considered completely reliable.

 The technical solution aims to ensure the full reliability of the support of the masonry of the uncooled part of the mine. This goal is achieved by the fact that the support bracket is located horizontally, the base plate for masonry is placed on it, the horizontal bracket is cooled regardless of the circulation loop of the vertical brackets of the shaft, namely, it can be connected independently to the lowering and lifting headers of the evaporative cooling system or cooled by technical water ( also independently from the process water collector). This connection provides high cooling reliability. Indeed, no damage to the mine cooling system (blockage of communications, disconnection of the vertical chains of brackets) can lead to failure of the horizontal brackets, since they have an independent supply and drainage of water.

 The inputs and outputs of the horizontal bracket through the casing are taken apart from the conclusions of the vertical brackets, therefore, the weakening of the casing by the holes is reduced.

 The design is shown in FIG. 1-3. Along the casing of the shaft 1, brackets 2 of thick-walled steel pipes are laid. The annular space is filled with refractory concrete 3. A layer of heat-insulating material is laid between the casing and refractory concrete 4. The described part of the construction relates to the device of the mine cooling system, which is joined by the device for supporting the masonry of the upper uncooled part of the masonry of the mine, which is the subject of the invention.

 The masonry support is a cooled bracket 5 from a thick-walled steel pipe, which passes through its openings in the furnace casing with its two ends and is welded to the casing with a strong, dense seam. On this bracket is a horizontal steel sheet 6 welded to the bracket. The masonry of the uncooled part of the shaft rests on this sheet. The cooled brackets of the shaft panels are connected (with evaporative cooling) to their lowering and lifting manifolds. When water cooling, the cooled bracket 5 has its own supply and removal of process water not connected with the vertical row of series-connected brackets 2.

The length of the support pipes is equal to twice the pitch between the rows of vertical cooled brackets. This length is selected based on the fact that:
the support pipe must ensure the strength of the support device, since it carries the weight of the masonry of the uncooled part of the shaft;
the input and output of the support pipe through the casing (through the holes in the casing) should weaken the casing as little as possible. This can be achieved by cutting holes in the casing along a line passing in the middle between the vertical rows of staples, i.e. length equal to the double step between the cooled brackets (figure 1).

 The device operates as follows.

 At the boundary of the cooled and uncooled parts of the mine, support devices are installed to support the masonry of the upper uncooled part of the mine. These devices consist of a horizontal bracket 5, welded to the furnace casing, a horizontal steel sheet 6, which serves as a support for masonry. The cooling medium (with water and evaporative cooling) is individually supplied to the horizontal brackets 5 (regardless of the connection of the vertical brackets to the water supply system).

 According to the accumulated experience of the operation of blast furnaces, the masonry in the area of the cooled part of the mine within 1-1.5 years of operation of the furnace in the middle part is completely destroyed.

 In the lower part of the shaft (steam) in the presence of horizontal refrigerators of the marator, part of the masonry remains intact and works until the end of the campaign of the furnace.

 In the upper cooled part of the shaft, the masonry is partially delayed. The height of the remaining masonry is 1-1.5 m. However, by the end of the campaign the furnace also collapses.

 The uncooled part of the masonry above the masonry support device runs until the end of the furnace campaign.

 Thus, the most difficult conditions for the service of chilled brackets are created in the middle chilled part of the shaft. It is in this part of the mine that brackets (refrigerators in the traditional design of the mine) can fail.

 When disconnecting staples (refrigerators), when they burn out without a cooling medium, a vertical chain of cooled elements remains.

 Therefore, in this device, the water supply to the support pipes is performed independently (regardless of the communications of the cooling system of vertical brackets).

 Since the support pipes are located in an area not dangerous for masonry and the pipes themselves are reliably cooled (individual supply of a cooling agent), reliable masonry service is provided throughout the entire blast furnace campaign. The durability of this part of the masonry will not depend on the condition of the cooled part of the shaft (the presence of masonry, the integrity of the cooled elements, the condition of the casing).

 Thus, this device provides reliable masonry service uncooled part of the mine.

Claims (1)

 Cooled device for supporting the masonry of the upper uncooled part of the shaft of a blast furnace, including a casing and supporting elements located in the refractory material, containing supporting cooled pipes made in the form of brackets, the input and output of which are rigidly attached to the casing, and supporting plates attached from above to the supporting cooled pipes, as well as pipes of the mine cooling system located between the support pipes, characterized in that the cooled support pipes are made of steel, thick-walled and are located horizontally hydrochloric plane, wherein the length of each support tube is cooled to twice the step between the pipe shaft of the cooling system, and input and output of it is located on half the pitch between the pipes.

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