CN201817415U - Insertion brick for cooling wall of blast furnace - Google Patents

Abstract

The utility model relates to an insertion brick for a cooling wall of a blast furnace, which is provided with a dovetail structure and mounted with a dovetail groove of the cooling wall in a matching manner. The insertion brick is made from materials consisting of alumina, corundum, silicon carbide, alumina fine powder, wollastonite, bonding agent, water reducing agent and steel fibers, the bonding agent consists of calcium sulfoaluminate cement or phosphoric acid or aluminum dihydrogen phosphate, content of the metal steel fiber in the brick is as high as 10%-20% of the volume of the brick and 15%-40% of the weight of the brick, and the insertion brick is manufactured by means of grouting prefabrication forming technique.

Description

A kind of blast furnace cooling stave edge brick

Technical field

The utility model relates to the firebrick structure that the blast furnace cooling stave liner is inlayed, and is a kind of blast furnace cooling stave edge brick.

Background technology

Blast furnace cooling stave generally all is designed to be with the dovetail-indent interior wall construction, so that inlay the refractory brick protective layer.The refractory brick that is embedded in the cooling stave surface can effectively protect cooling stave not worn and torn by furnace charge, also forms one thermal resistance simultaneously in the furnace wall to reduce furnace wall heat radiation energy consumption.

But the refractory materials on cooling stave surface environment for use of living in is very harsh, it wants to bear for a long time the washing away of wearing and tearing, rising coal gas stream of erosion, the furnace charge of slag, the thermal shocking of temperature variation etc. under the pyritous condition, thereby general some months or just progressively worn and torn slightly for a long time or wash away.Not had the protection of refractory materials, will come out and directly contact washing away and corroding of high temperature furnace charge and furnace gas in the cooling stave surface.Simultaneously, owing to there be not the heat insulation of refractory masses, cooling stave internal cooling water can be taken away a large amount of heats, causes scattering and disappearing of a large amount of heats, shows as the high coke ratio and the high energy consumption of production.

The refractory materials reason that washes away that is worn mainly is that refractory materials is generally hard brittle material, and the significant shear power at dovetail-indent place is easy to cause the root fracture of edge brick, thus cause the refractory materials protective layer come off in addition integral body collapses.

Fusion zone at blast furnace; after the cooling stave refractory materials is washed away; slag can bond to and form a protective layer on the furnace wall; the effect of slag protective layer is heat insulation equally and prevents that the cooling stave surface is worn; but this slag crust and cooling stave is bonding insecure; can frequently come off, cause the cooling stave local superheating sometimes, even burn indivedual cooling staves.

And generally seldom there is slag the middle and upper part of blast furnace, so after the cooling stave refractory materials is worn, has been difficult to slag and adhered to, and this will inevitably cause the direct wearing and tearing and the thermal losses greatly of cooling stave metal construction.Simultaneously and since the water-cooled tube of a lot of blast furnaces be up and down UNICOM single channel control, blast furnace also may cause the decline of overall operation efficiency because the middle and upper part cooling intensity is excessive.

In order to prevent problems such as burning of high energy consumption and cooling stave; blast furnace generally all adopts regular inner-wall spraying spray repair or is pressed into makes liner repairing; purpose all is after the inwall refractory materials is worn, and manages to construct on inwall again the new refractory materials protective layer of one deck.

But no matter be spray repair or be pressed into that the work-ing life of material is still very short, general half a year of liner of method spraying or promptly come off for a long time slightly.Therefore, blast furnace in using stove labour, in order to guarantee the normal operation of blast furnace, regular inner-wall spraying or to be pressed into be a kind of liner maintenance service of normality.And after inlaying anti-material and damaging back or gunning material and damage, can only look to cooling stave to adhere to adhering to one deck slag come heat insulation and the protection cooling stave.

Summary of the invention

The purpose of this utility model is exactly to develop a kind of novel high-intensity cooling stave edge brick, a kind of blast furnace cooling stave edge brick, and brick has the dovetail structure, installs with cooling stave dovetail-indent coupling.

Concrete scheme is: add water stirring formation mud after adopting refractory materials powder and aluminosulfate cement mixing, adopt slip casting method to fill the fibre gap of the metallic steel fiber that fills up in the prefabricated space.Refractory materials is mixed evenly by a certain percentage by raw materials such as alumina, corundum, silicon carbide, alumina powder, silicon ash, water reducers, wedding agent is a calcium sulphoaluminate cement, the content of steel fiber is 10%～20% of final pour mass volume, and weight ratio should reach 15%～40%.

Specific implementation method of the present utility model is: prepare at first in proportion that above-mentioned to comprise calcium sulphoaluminate cement standby at interior refractory mixture (not comprising steel fiber in the mixture).

Be ready to mould by brick type size, and in mould, dispense steel fiber, in whole moulds, fill steel fiber.The Intake Quantity of steel fiber should reach the percent by volume that plan adds, such as accounting for 16% of brick volume.

With being stirred into high workability mud behind the above-mentioned refractory powder adding tap water, slowly inject in the mould, allow mud infiltrate the steel fiber gap.For guaranteeing that mud is full of the gap between whole steel fibers, mould should be placed on auxiliary vibration on the shaking table.

After mud is filled with, polish casting surface, harden together with mould room temperature maintenance to preformed bricks.

Treat the demoulding of preformed bricks sclerosis back, the wet brick after the demoulding can continue the room temperature maintenance, also can directly put into roaster and progressively be warming up to about 350 ℃ insulation at least 12 hours, then naturally cooling.

Preformed bricks after the oven dry should be through processing such as deburring polishings, to guarantee thematic dimensional precision and visual appearance.

Key problem in technology of the present utility model is: contain the steel fiber of high volume fraction in the prefabricated edge brick, its shared volume fraction 10%～20%.(strengthen the content of steel fiber in the refractory castable far above conventional steel fiber just because of containing a large amount of steel fibers in this prefabricated edge brick, content of steel fiber is by weight not being higher than 5% in the general steel fiber enhancing refractory castable, can not be higher than 2% by volume), so this prefabricated edge brick has high thermal conductivity, therefore after using on the cooling stave, the temperature of whole edge brick layer self is not high, thereby guaranteed that edge brick layer material has high shearing resistance folding strength all the time, therefore dovetail-indent shear fracture at the interface can not take place, show as on the whole yet and have high wear-resisting anti-mechanical shock performance.

Key problem in technology of the present utility model also is: prefabricated edge brick adopts the combination of calcium sulphoaluminate cement, because contain larger proportion Calucium Silicate powder composition in the cement, therefore prefabricated edge brick is more near slag composition (the blast furnace granulated slag composition mainly is the Calucium Silicate powder mineral), thereby makes the easier adhesion slag that adheres to of edge brick.

Advantage of the present utility model is:

What 1, edge brick of the present utility model adopted is the pre-formed technology of slip casting, present relatively traditional brickmaking high temperature firing process, and its flow process is short, and technology is simple, production handiness height.

2, edge brick of the present utility model contains volume fraction up to 10～20% steel fiber, the slip resistance of therefore inlaying brick is high, and toughness is fabulous, therefore is expected to solve the ubiquitous edge brick of present edge brick dovetail breakage problem, thereby realizes the permanent existence of edge brick and saving energy and reduce the cost of blast furnace.

3, according to the position difference of blast furnace, used refractory materials can be according to the environment for use adjustment in the prefabricated edge brick, such as improving thermal conductivity by improving the silicon carbide ratio, reduces the calcium sulphoaluminate cement consumption with the fire performance that improves prefabricated edge brick etc.

Description of drawings

Accompanying drawing 1 is the prefabricated edge brick of cooling stave, the dovetail-indent size match of dovetail structure and cooling stave.

Embodiment

The refractory materials batching: by weight, 30 parts of calcineds bauxite in powder, 50 parts of lapis amiridiss, 50 parts of carborundum powders, 10 parts of alumina powders, 10 parts of silicon powders, 15 parts of calcium sulphoaluminate cement, 2 parts of water reducers.

Be ready to mould by brick type size, and in mould, dispense steel fiber, in whole moulds, fill steel fiber.The Intake Quantity of steel fiber is 16% of a brick percent by volume.

With being stirred into high workability mud behind the above-mentioned refractory powder adding tap water, slowly inject in the mould, allow mud infiltrate the steel fiber gap.For guaranteeing that mud is full of the gap between whole steel fibers, mould should be placed on auxiliary vibration on the shaking table.

After mud is filled with, polish casting surface, harden together with mould room temperature maintenance to preformed bricks.

Treat the demoulding of preformed bricks sclerosis back, the wet brick after the demoulding can continue the room temperature maintenance, also can directly put into roaster and progressively be warming up to about 350 ℃ insulation at least 12 hours, then naturally cooling.

Preformed bricks after the oven dry should be through processing such as deburring polishings, to guarantee thematic dimensional precision and visual appearance.

Claims (1)

1. a blast furnace cooling stave is inlayed brick, and it is characterized in that: brick has the dovetail structure, installs with cooling stave dovetail-indent coupling.

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