CN205077080U - Copper -steel compound type blast furnace cooling wall - Google Patents

Abstract

The utility model discloses a copper-steel composite blast furnace cooling wall to solve the problem that the current copper cooling wall is easily damaged. It includes a copper stave wall body with cooling water pipes buried inside. There are many parallel grooves arranged longitudinally on the copper stave wall body. Each groove is inlaid with an inlaid steel plate, and the other end of the inlaid steel plate is inlaid on the cooling wall. In the refractory inner lining of the hot surface of the stave, the refractory inner lining of the hot surface of the stave is connected with the wall body of the copper stave through an inlaid steel plate. Since the hot surface of the copper stave is inlaid with steel plates and has a certain elevation angle, even if the slag skin falls off during the blast furnace production process, there is still a small amount of slag skin in the groove of the stave, which can effectively block heat and protect the copper stave body. In addition, the safe service temperature of the inlaid steel plate is higher than 800°C, which can effectively resist the scour of the high-temperature gas flow and slag-iron flow in the furnace, and prolong the service life of the stave.

Description

A copper-steel composite blast furnace stave

technical field

The utility model relates to a copper-steel compound blast furnace cooling wall.

Background technique

The stave is one of the main equipment on the ironmaking blast furnace. At present, blast furnaces both at home and abroad adopt a full cooling stave structure or a plate-wall combination structure. Among them, the stave is composed of the wall body and refractory bricks. After 2 to 3 years after the blast furnace was opened, the bricks were completely eroded. In actual production, due to fluctuations in blast furnace raw fuel conditions, operating system adjustments, or other uncontrollable factors, the slag skin will fall off, and the surface of the stave is directly exposed to the high-temperature gas flow, slag-iron flow or high-temperature molten material, resulting in stave cooling. The surface temperature rises sharply, which accelerates the erosion and damage process. At present, the lower part of the furnace body, the furnace waist and the furnace belly of large blast furnaces mostly use brick-inlaid copper staves. Since the safe working temperature of copper staves is below 250 ° C, and the temperature of high-temperature gas flow in the furnace is generally above 1200 ° C, so , when the original slag skin falls off and the new slag skin has not yet formed, it will cause the temperature of the hot surface of the copper stave to be too high, thereby accelerating the abnormal damage of the copper stave. Therefore, in order to effectively alleviate the damage of the copper stave at this part, it is necessary to improve the original structure to meet the requirements of the blast furnace and prolong the service life of the stave.

Contents of the invention

The purpose of the utility model is to overcome the defects of the prior art, provide a copper-steel composite blast furnace stave, and prolong the service life of the stave.

The technical scheme of the utility model is realized as follows: a copper-steel composite blast furnace stave, including a copper stave wall body with cooling water pipes buried inside, and a plurality of parallel concave staves arranged longitudinally on the copper stave wall body groove, which is that each groove is inlaid with an inlaid steel plate, and the other end of the inlaid steel plate is inlaid in the refractory inner lining of the hot surface of the stave, and the refractory inner lining of the hot surface of the stave and the copper stave wall are connected by the inlaid steel plate. connected.

Preferably, the groove is a U-shaped groove.

Preferably, the groove has an upward elevation angle.

Preferably, the range of the elevation angle is 0°≤α≤60°.

After adopting the utility model, the service process of the copper stave can be divided into two stages: the first stage is the existence period of the refractory lining, in this stage, the high temperature gas flow and slag iron flow in the furnace will be resisted by the refractory lining; The second stage is that the refractory lining has been eroded away, and a layer of slag will condense on the surface of the copper stave, and the slag will hang on the hot surface of the stave embedded with steel plates. When the production conditions of the blast furnace fluctuate, the slag skin may fall off. In a short time after the slag skin falls off, the high-temperature gas flow and the slag-iron flow will directly wash the hot surface of the cooling wall. The temperatures of the high-temperature gas flow and slag-iron flow are generally at Above 1200°C, resulting in a sharp rise in the temperature of the hot surface of the stave, once the temperature exceeds the limit service temperature of the stave, it will accelerate the erosion and damage of the stave. Compared with the original common brick-embedded copper cooling stave technology, the utility model has the advantages that: when the slag skin falls off, generally the connection between the slag skin in the groove and the hot surface of the stave is broken, and the utility model In the new model, the U-shaped groove and the inlaid steel plate have a certain elevation angle, so there is generally a small amount of residual slag in the groove and between the adjacent inlaid steel plates. The above-mentioned slag can still protect the copper stave body. The inlaid steel plate can also play a certain supporting role for the slag skin; and the hot surface of the inlaid steel plate in the cooling wall will directly resist the erosion of the high-temperature gas flow and slag-iron flow. Since the safe service temperature of the steel is above 800°C, its high temperature Performance is significantly better than copper. Therefore, after the original slag skin falls off and the new slag skin has not yet formed, the inlaid steel plate can better resist heat flow impact and mechanical erosion compared with the copper ribs of the original copper stave. The main body is made of copper, and its high thermal conductivity can still make the surface temperature of the steel plate and the groove drop to the slag condensation temperature quickly, and a layer of slag skin is quickly hung on the hot surface of the cooling wall, so that the entire cooling wall will be protected by the slag skin again. After the utility model is adopted, the stave is at a safe service temperature in different service stages and under different furnace conditions, so it can effectively prolong the service time of the stave, reduce maintenance costs, and ensure smooth production of the blast furnace.

Description of drawings

Fig. 1 is a schematic diagram of the existing stave structure.

Fig. 2 is a structural schematic diagram of Embodiment 1 of the utility model.

Fig. 3 is a structural schematic diagram of Embodiment 2 of the utility model.

In the figure, 1-copper stave wall body, 2-cooling water pipe, 3-groove, 4-inlaid steel plate, 5-refractory lining.

detailed description

Further describe below in conjunction with accompanying drawing:

As shown in Figure 1, the existing stave includes a copper stave wall body 1 with a cooling water pipe 2 buried inside, and a plurality of parallel grooves 3 are arranged longitudinally on the copper stave wall body 1, and the refractory lining 5 is inlaid in groove 3. Two to three years after the blast furnace was opened, the refractory lining 5 was completely eroded. During the subsequent service process, the copper stave wall body 1 mainly relies on the slag covering the surface for self-protection. However, in actual production, due to the blast furnace raw fuel Fluctuation of conditions, adjustment of operating system or other uncontrollable factors will cause the slag skin to fall off, causing the surface of the copper stave wall body 1 to be directly exposed to the high-temperature gas flow, slag-iron flow or high-temperature molten material, resulting in a sharp increase in the surface temperature of the stave Elevated to accelerate its erosion and damage process.

Fig. 2 is embodiment 1 of the present utility model, a kind of copper-steel compound type blast furnace stave, mainly comprises the copper stave wall body 1 that is embedded with cooling water pipe 2 inside, on the copper stave wall body 1 there are many vertically arranged There are parallel grooves 3, each groove 3 is inlaid with an inlaid steel plate 4, and the other end of the inlaid steel plate 4 is inlaid in the refractory lining 5 on the hot surface of the stave, and the refractory inner lining on the hot surface of the stave is inlaid by the inlaid steel plate 4. The lining 5 is connected with the copper stave wall body 1, and the groove is a U-shaped groove with an upward elevation angle of 30°. The depth and width of the groove 3 and the size of the inlaid steel plate 4 can be determined according to actual needs. The cross section of the inlaid steel plate 4 is a parallelogram, and it should be ensured that the inlaid steel plate 4 fits closely with the groove 3 when installed. The installation method of the refractory lining 5 can be rammed, sprayed or poured, and the thickness range is 100mm-200mm. Generally, refractory materials with high thermal conductivity should be selected.

Through this embodiment, the principle of safe service of the stave lies in: because the hot surface of the copper stave is inlaid with steel plates and has a certain elevation angle, it can be applied to the lower part of the blast furnace shaft, furnace waist, bosh and other parts. In the blast furnace production process, even if the slag skin falls off, there is still a small amount of slag skin in the cooling stave groove, which can effectively block heat and protect the copper stave body. In addition, the safe service temperature of the inlaid steel plate is higher than 800°C, which can effectively resist The scour of high temperature gas flow and slag iron flow in the furnace.

Fig. 3 is embodiment 2 of the present utility model, and the difference with embodiment 1 is that the elevation angle with groove 3 is 0 °, that is, groove 3 and inlaid steel plate 4 are all horizontal, and inlaid steel plate 4 cross-section is rectangular, on cooling wall During service, its safe service principle is the same as that of embodiment 1, which can meet the service requirements of long-life blast furnaces.

Claims (4)

1. A copper-steel composite blast furnace stave, comprising a copper stave wall body embedded with cooling water pipes inside, a plurality of parallel grooves arranged longitudinally on the copper stave wall body, characterized in that: each groove Each slot is inlaid with an inlaid steel plate, and the other end of the inlaid steel plate is inlaid in the refractory inner lining of the hot surface of the stave, and the refractory inner lining of the hot surface of the stave is connected with the copper stave wall through the inlaid steel plate. 2. A copper-steel composite blast furnace stave according to claim 1, characterized in that the groove is a U-shaped groove. 3. A copper-steel composite blast furnace stave according to claim 1 or 2, characterized in that the groove has an upward elevation angle. 4. A copper-steel composite blast furnace stave according to claim 3, characterized in that: the range of elevation angle is 0°≤α≤60°.