CN202530098U - Cast-iron cooling wall for blast furnace body - Google Patents

Abstract

The utility model discloses a cast iron stave for a blast furnace body, which comprises a cross-shaped stave main body, a central hole is opened in the center of the stave main body, and the inside of the stave main body is arranged around the central hole There are cast-in cooling water pipes, which include a water outlet and a water inlet. The cast iron cooling wall of the utility model can achieve the purpose of evenly covering the gaps between the cooling plates, thereby strengthening the cooling in this area.

Description

Cast Iron Staves for Blast Furnace Body

technical field

The utility model relates to blast furnace cooling equipment, in particular to a cast iron cooling wall for a blast furnace body.

Background technique

The choice of furnace cooling equipment is very important to the life of blast furnace. The selection of appropriate cooling equipment and reasonable configuration can ensure that each part has a suitable cooling intensity, maintain a reasonable internal shape of the blast furnace operation, and is conducive to the enhanced smelting and stable operation of the blast furnace. The basic requirements for the cooling structure of the furnace body of the blast furnace are: first, it should have sufficient cooling strength to protect the furnace skin and inner lining; secondly, the middle and upper part of the furnace body can support the inner lining, and it is easy to form a working inner shape; thirdly, , Bosh, furnace waist, and lower part of the furnace body are easy to form slag skin to protect the inner lining and furnace skin; finally, the airtightness and strength of the furnace skin cannot be affected.

Cooling equipment commonly used in my country includes staves, cooling plates, etc. Cooling staves are divided into smooth staves, brick-inlaid staves, boss-inlaid brick staves, etc. The materials used are divided into heat-resistant cast iron, ductile iron, steel and copper staves; and cooling plates are mainly divided into cast copper staves. Cooling plate vs cast iron cooling plate. Blast furnace body cooling is to use a combination of different cooling equipment to achieve the purpose of protecting the furnace skin and maintaining the furnace type. If the temperature of the hot surface of the cooling equipment exceeds 400°C, a phase change may occur and the damage of the cooler will be accelerated. Therefore, whether the cooling structure of the furnace is reasonable or not has a great impact on the longevity of the blast furnace.

One of the main reasons for limiting the life of the blast furnace in the blast furnace body is the life of the furnace waist and the middle and lower parts of the furnace body. Due to the harsh smelting conditions and working environment in this part, the thermal load fluctuates greatly, the thermal shock phenomenon is serious, and the high temperature gas Under the influence of comprehensive factors such as flow scour, the inner lining is easy to corrode, peel off or fall off, so the cooling structure design of this part is particularly important.

At present, blast furnaces at home and abroad have adopted cooling types suitable for the blast furnace according to their respective conditions. Common furnace body cooling structures mainly include cooling plates, staves, and plate-wall combinations. The cooling of the furnace waist and the middle and lower parts of the furnace body mainly uses copper staves and copper cooling plates, both of which have their own advantages. The copper stave has high cooling strength, can play the role of supporting bricks, has a large cooling area and good sealing performance, but the local resistance is relatively poor, and it is inconvenient to replace. The copper cooling plate has high cooling strength, can maintain a good brick lining, and can resist local large heat flow, but the inner lining is damaged and irregular, and the furnace skin has many openings.

More specifically, for a blast furnace that adopts the cooling method of copper cooling plates, in the middle and late stages of the furnace operation, due to reasons such as furnace wall erosion and falling off, air flow scour, and furnace material wear, the refractory materials of the furnace body will become thinner, and the refractory materials will affect the furnace shell. The protection ability is weakened. When the slag skin falls off and the air flow is abnormal in the furnace, the furnace skin is directly affected by the high temperature in the furnace due to the decrease in cooling capacity, causing the temperature of the furnace skin to rise rapidly or even turn red. According to production experience, when the surface temperature of the furnace skin is higher than 350°C and the number reaches 11 times, the furnace skin will crack, which brings many hidden dangers to the safety, production and longevity of the blast furnace.

In addition, due to the intensified smelting of large-scale blast furnaces, the economic and technical indicators such as the coal ratio of blast furnaces and blast furnace utilization coefficients have been at a relatively high level, which increases the erosion and wear of the blast furnace wall, so the heat load of the blast furnace body, especially the bosh The area from the furnace waist to the middle of the furnace shaft is always at a relatively high level. The cooling of the original cooling plate of the furnace body has been difficult to ensure the existing high-intensity smelting.

Utility model content

The purpose of this utility model is to solve the above-mentioned deficiencies of the existing blast furnace cooling equipment, thereby providing a new type of cast iron stave for the blast furnace body, which can be used in conjunction with the existing cooling plate to be used in the blast furnace Furnace cooling.

The cast iron stave used for the blast furnace body of the utility model comprises a cross-shaped stave main body, a central hole is opened in the center of the stave main body, and a cast-in hole is arranged inside the stave main body around the central hole. The cast-in cooling water pipe includes a water outlet and a water inlet.

Preferably, the cast-in cooling water pipe is respectively provided with protective sleeves around the cast-in cooling water pipe at the water outlet and the water inlet.

Through the installation of the cast iron cooling wall of the utility model, the purpose of evenly covering the gaps between the cooling plates can be achieved, thereby strengthening the cooling in this area.

Description of drawings

Fig. 1 is the schematic diagram of the cast iron cooling stave that is used for blast furnace body of the present utility model;

Fig. 2 is a sectional view along line A-A in Fig. 1;

Fig. 3 is the installation schematic diagram when the cast iron stave of the present utility model is used in combination with the cooling plate;

Fig. 4 is a schematic diagram of the utility model installed on a blast furnace body.

Detailed ways

The structure and working principle of the cast iron stave for blast furnace body of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figure 1, it is a schematic structural view of a cast iron stave used for a blast furnace body of the present invention. As shown in the figure, the cast iron stave includes a cross-shaped stave main body 10. A central hole 11 , and a cast-in cooling water pipe 20 is provided around the central hole inside the stave main body 10 , and the cast-in cooling water pipe 20 includes a water outlet 21 and a water inlet 22 . As shown, the cast-in cooling water pipe 20 circuit is preferably shaped similarly to the cast iron stave to maximize uniform cooling. The opened central hole 11 is used to leave a gap for the used cooling plate in the blast furnace during subsequent installation.

In addition, the cast iron stave of the present invention also includes two installation holes 12, 13 for fixing on the blast furnace body during installation.

More specifically, as shown in FIG. 2 , the cast-in cooling water pipe 20 is provided with protective sleeves 30 around the cast-in cooling water pipe 20 at the water outlet and water inlet, respectively, so that the water outlet and the water inlet The cooling water pipe at the place is protected.

3 and 4, when the cast iron stave 100 of the present utility model is installed, it is distributed in the furnace waist of the blast furnace 40 and the gaps of each section cooling plate 200 in the lower part of the furnace body, and the number of each section of the cast iron stave 100 is the same as The number of cooling plates in each section is the same. The central hole 11 of the cast iron stave 100 is inserted into the cooling plate. The upper and lower ends of the wall body are connected to the cooling plates 200 of the upper and lower sections, and the upper, lower, left, and right sides are adjacently installed other cast iron cooling walls 100 . Through the installation of the cast iron stave 100 , the purpose of evenly covering the gaps between the cooling plates can be achieved, thereby strengthening the cooling in this area.

The cast iron stave used for the blast furnace body of the utility model has the following advantages:

1. Strengthen the cooling of the furnace waist and the middle and lower parts of the furnace body, which is conducive to the operation and maintenance of the furnace. The installation of cast iron cooling staves can strengthen the cooling of the blast furnace waist and the middle and lower parts of the furnace body, so that these areas with harsh working environments can quickly and effectively form slag skin, protect the cooling plate and furnace lining, and make the furnace shape uniform in the circumferential direction of the blast furnace. The inner shape of the operation is smooth, which is conducive to the stable and efficient production of the blast furnace.

2. Protect the furnace skin in the cooling area, which is beneficial to the longevity of the blast furnace. The existence of cast iron staves can not only slow down the erosion of the internal brick lining, but also isolate the internal thermal shock to the furnace skin, effectively protect the blast furnace skin, avoid redness or cracking of the furnace skin, and greatly prolong the life of the first-generation blast furnace.

3. Simple design and easy installation. The cast iron cooling stave of the utility model is a smooth cast iron cooling stave, which is consistent with the ordinary cooling stave except for its shape. The shape depends on the cooling plate used in the blast furnace and the size of the blast furnace. After installation, the small cooling stave can effectively cover the cooling space of the cooling plate. , to achieve enhanced cooling effect.

Claims (2)

1. a cast iron stave for blast furnace body, it is characterized in that, comprise the stave main body that is cross, the center of described stave main body is provided with center hole, and described stave main body inside surrounds described center hole A cast-in cooling water pipe is provided, and the cast-in cooling water pipe includes a water outlet and a water inlet. 2. The cast iron cooling stave for blast furnace body according to claim 1, characterized in that, the cast-in cooling water pipes are respectively provided with cooling water pipes around the cast-in cooling water pipes at the water outlet and the water inlet. protective casing.

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