CN205275627U - High temperature chute with cooling function - Google Patents

Abstract

The utility model provides a high temperature chute with cooling function, including chute body and air -cooled unit, the chute body includes adventitia and inner membrance, the adventitia with it has the fire resistant infilling to fill between the inner membrance, wherein: the forced air cooling unit is fixed in the adventitia with the inner membrance, the forced air cooling unit bury underground in the fire resistant infilling, the forced air cooling unit includes a plurality of forced air cooling component, the forced air cooling component includes the circulating line and locates the intake pipe and the outlet duct at circulating line both ends, the intake pipe with the outlet duct stretches out the chute body. The utility model discloses a high temperature chute has reduced the temperature of fire resistant infilling through air -cooled component, has obviously promoted the cooling level, has lengthened the life of chute, has reduced refractory material's use amount indirectly.

Description

A high temperature chute with cooling function

technical field

The utility model relates to the structural design of a tapping channel of an ironmaking blast furnace, in particular to a high-temperature chute with a cooling function.

Background technique

As one of the indispensable key facilities during the operation of the ironmaking blast furnace, the service life of the tapping trough is one of the key factors affecting the utilization efficiency of the blast furnace. The tapping trough with a long service life not only reduces the consumption of high energy consumption raw materials to a certain extent Demand, under the premise of reducing consumption, ensure the stable production of blast furnace iron, so as to achieve the purpose of improving material utilization efficiency, longer service life reduces the maintenance frequency of iron trough, and the labor intensity of maintenance personnel is also reduced. Every time the maintenance site environment is poor, there is a lot of dust, so the environment in front of the furnace is also maintained when the maintenance frequency is reduced.

In addition to the furnace condition of the blast furnace itself, the smelting process and other factors, the factors that determine the service life of the iron trough mainly include the chemical corrosion resistance and physical erosion resistance of the iron trough material and the structure of the iron trough itself. Since a relatively uniform iron channel structure has basically been formed in the industry at present, the ability of the material to resist chemical erosion and physical erosion almost directly determines the service life of the iron channel.

In the existing material system, the life of the iron trough is often extended by improving the quality of the material. However, since the temperature of the slag-iron mixture flowing in the iron trough is between 1450-1500 ° C, and the specific gravity of the fluid is relatively high, there are relatively Strong penetration, so under the condition of such high temperature and strong corrosion, the potential to prolong the life of the hook by improving the quality of the material itself is limited, and it is often directly accompanied by an increase in cost.

The thermal expansion rates of materials are different, and the greater the temperature difference, the greater the difference in expansion. Therefore, reducing the temperature of the iron channel material can effectively improve the compactness of the material, reduce the thermal stress in the material, and improve the chemical corrosion resistance of the material. The temperature of the contacted slag-iron fluid decreases, thereby reducing its flow velocity. On this premise, the physical scouring force of the slag-iron fluid on the material can be further reduced.

The existing iron trench cooling technology mainly includes two methods: water cooling and air cooling. Among them, the cooling efficiency of water cooling technology is higher, but the water will directly sublimate when encountering high temperature molten iron, and become gas, and the rapid volume expansion will cause explosion. Directly related to Safety; while the air-cooling technology generally adopts the air-cooling device placed outside the outer steel shell, because the distance from the slag-iron fluid is too far, so the cooling effect is not obvious.

Utility model content

In view of this, the utility model provides a high-temperature chute with cooling function, aiming at improving the service life of the chute.

The technical scheme that the utility model adopts is specifically:

A high-temperature chute with cooling function, comprising a chute body and an air cooling unit, the chute body includes an outer film and an inner film, and refractory filler is filled between the outer film and the inner film; wherein:

The air cooling unit is fixed on the outer membrane and the inner membrane;

The air cooling unit is embedded in the refractory filler;

The air-cooling unit includes several air-cooling elements, and the air-cooling element includes a circulation pipe and an air inlet pipe and an air outlet pipe arranged at both ends of the circulation pipe, and the air inlet pipe and the air outlet pipe protrude from the chute body .

In the above-mentioned high temperature chute with cooling function, the air-cooling unit includes a plurality of air-cooling elements, and the plurality of air-cooling elements are connected in parallel and placed between the outer membrane and the inner membrane.

In the above high temperature chute with cooling function, the distance between the air cooling unit and the inner membrane is smaller than the distance between the air cooling unit and the outer membrane.

In the above-mentioned high-temperature chute with cooling function, the compressed gas after heat exchange and temperature rise in the circulation pipeline is introduced into the waste heat utilization device through the gas outlet.

In the above-mentioned high-temperature chute with cooling function, the waste heat utilization device is a hot blast stove of an ironmaking blast furnace.

In the above-mentioned high-temperature chute with cooling function, the chute body is a main iron ditch, a branch ditch or a slag ditch of an ironmaking blast furnace.

In the above-mentioned high temperature chute with cooling function, the refractory filler is castable or ramming material.

In the cooling method of the above-mentioned high-temperature chute, the intake pressure of the compressed air is ≥4kg.

The beneficial effects that the utility model produces are:

The air-cooled element of the utility model prolongs the service life of the refractory material by lowering the temperature of the refractory material. On the premise of prolonging the average service life of the iron ditch, slag ditch, etc., the usage of the refractory material is indirectly reduced, and the The overall cost of the iron ditch;

Compared with the conventional water-cooling method, the high-temperature chute of the utility model will not cause hidden dangers such as explosion during the cooling process, and is safer; and there is less human intervention in the cooling process, which reduces the labor intensity of the staff, thereby ensuring the stable production of the blast furnace , reducing the operating cost of the iron ditch.

Description of drawings

The present invention is more fully and better understood when considered in conjunction with the accompanying drawings. The drawings described here are used to provide a further understanding of the utility model, and the embodiments and their descriptions are used to explain the utility model, and do not constitute improper limitations to the utility model.

Fig. 1 is a structural schematic diagram 1 of an air-cooled element of a high-temperature chute with cooling function of the present invention;

Fig. 2 is a structural schematic diagram 2 of an air-cooled element of a high-temperature chute with cooling function of the present invention;

Fig. 3 is a structural schematic diagram (before pouring) of a high-temperature chute (main iron trough) including air-cooled elements of the present invention.

In the picture:

1. Air-cooled components

11. Air intake pipe

12. Circulation pipeline

13. Outlet pipe

2. Taphole

3. Internal mold

4. External mold.

detailed description

The technical solution of the present utility model will be described in further detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 3, a high-temperature chute with cooling function, in the main iron ditch behind the taphole 2, the air-cooled element 1 is embedded in the castable or ramming material between the inner film 3 and the outer film 4 Inside.

The structure of the air-cooled element 1 is further shown in Figures 1 and 2, including an air inlet pipe 11, an air outlet pipe 13, and a circulation pipe 12 between the two consisting of one or more groups of curved pipes, an inner membrane 3 and an outer membrane 4 (such as the outer steel shell) is filled with castable or ramming material, and the air-cooled element 1 is buried in the castable or ramming material between the outer membrane 4 and the inner membrane 3, and the high-speed compressed low-temperature gas connected to the outside (The inlet pressure is not less than 4kg, and the low temperature is hundreds or even thousands of degrees Celsius relative to the material and slag iron, so direct compression of normal temperature air is also possible. As a preferred embodiment, it can be limited to the gas temperature ≤ 25°C) , to realize rapid heat exchange between the gas in the tube of the air-cooling element 1 and the refractory material (castable or ramming material) outside the tube.

Still taking the main iron ditch as an example, explain the air cooling process of refractory materials in actual construction:

First place the inner film 3 and outer film 4 of the main iron channel, and then place the circulation pipe 12 of the air-cooling element 1 on the mold (3, 4) according to the actual situation (such as refractory material characteristics, heat dissipation level requirements, etc.) Appropriate position between, and complete simple positioning;

After positioning, fill the castable or ramming material between the inner film 3 and the outer film 4, and connect the exposed air inlet 11 and air outlet 13 to the circulation pipe 12 through the mold to ensure normal delivery during the air cooling process. The wind, through the high-speed compressed low-temperature gas flowing through the circulation pipe 12, realizes the rapid cooling of the refractory material. The high-speed flowing gas will take away a large amount of heat in the external castable or ramming material. The data shows that the heat taken away by heat exchange per second is not less than 5600KJ, which effectively reduces the thermal stress in the external material. When applied to slag ditch The effect is more obvious, and even the liquid steel slag can quickly solidify into a mold slag layer when it flows through the surface of the refractory material, so that the refractory material is protected from direct thermal erosion and chemical corrosion of high-temperature liquid, thus greatly prolonging the life of the slag ditch .

The specific location needs to be determined according to the thermal conductivity of the refractory material and the groove structure of the entire main iron groove.

The air-cooling element 1 can be buried in a part of the main iron trench, or buried in the entire main iron trench. Of course, in addition to the main iron ditch in this embodiment, the application can also be extended to the subsequent branch ditch and slag ditch, as well as other high-temperature fluid chute structures.

In addition, the specific installation position and quantity of the air-cooling element 1 between the molds (3, 4) can be determined according to actual needs. Generally speaking, the distance between the air-cooled element 1 and the inner membrane 3 is smaller than the distance between it and the outer membrane 4, that is to say, it is closer to the inner membrane 3. This is because: on the one hand, being close to the inner membrane 3 is also It is close to the slag-iron high-temperature fluid, which is convenient for more efficient heat exchange; on the other hand, after the air-cooled element 1, a relatively thick working layer material is still reserved, which is used to ensure the blast furnace in the event of a failure of the air-cooled element 1. Normal tap iron. Moreover, according to actual cooling requirements, not only can the parameters of the curved pipes and the number of curved pipes be set for each circulation pipe 12, but also multiple circulation pipes 12 can be buried side by side in the refractory material.

The technical scheme of the utility model and the degree of solving the technical problems thereof are further illustrated below through a group of specific engineering examples.

The 2# blast furnace tapping channel of Shandong Ductile Iron Pipe Co., Ltd. has tried out the air-cooled element 1 of the present utility model. The air-cooling element 1 is embedded in the position. The air-cooling element 1 is composed of a curved shape with a diameter of 50mm. The circulation pipe 12 of the air-cooling element 1 is 2500mm long and 450mm high. The exposed material length of the air inlet pipe 11 and the air outlet pipe 13 is 50mm. The distance between the position where the air-cooled element 1 is embedded and the outer membrane 4 is 700mm (the distance between the inner membrane 3 and the outer membrane 4 is 1000mm), and the high-speed compressed low-temperature gas introduced is a compressed air with a pressure of 4kg (ie 0.4MPa). Air (normal temperature), the outlet pipe 13 is connected to the waste gas recovery device.

After a month of use and follow-up observation, the side of the side where the air-cooling element 1 is embedded has eroded by 140-150 mm, while the side of the side where the air-cooling element 1 is not embedded has corroded by more than 320 mm. The difference in erosion between the left and right sides of the iron point is so obvious that it (air-cooling element 2) will obviously reduce the erosion rate of the material and prolong the life of the iron groove.

Because the part where the iron falls is the fastest damaged part of the iron trough, its part bears the strongest chemical erosion and physical erosion, its service life can be extended by more than double, and it will inevitably be more obvious in other parts. On the premise that the service life of the iron trough can be extended, the number of maintenance materials used in a year will be reduced, and the materials required for maintenance will inevitably be reduced accordingly (at least 30 tons of materials are required for each maintenance). This shuts down the blast furnace and thus indirectly makes the operation of the blast furnace more efficient.

The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, and the accompanying drawings here are used to provide further understanding of the present utility model. Apparently, the above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto, and any person skilled in the art can easily think of it without actually departing from the present utility model. New changes or replacements are also included in the protection scope of the present utility model.

Claims (7)

1. one kind has the high temperature chute of refrigerating function, it is characterised in that, comprise chute body and wind cooling unit, described chute body comprises adventitia and inner membrance, is filled with fire resistant infilling between described adventitia and described inner membrance; Wherein:

Described wind cooling unit is fixed on described adventitia and described inner membrance;

Described wind cooling unit is embedded in described fire resistant infilling;

Described wind cooling unit comprises some air-cooled elements, and described air-cooled element comprises circulating line and is located at inlet pipe and the escape pipe at described circulating line two ends, and described inlet pipe and described escape pipe stretch out described chute body.

2. the high temperature chute with refrigerating function according to claim 1, it is characterised in that, described wind cooling unit comprises multiple air-cooled element, multiple described air-cooled element in parallel, parallel is placed between described adventitia and described inner membrance.

3. the high temperature chute with refrigerating function according to claim 1, it is characterised in that, the distance that the distance between described wind cooling unit and described inner membrance is less than between described wind cooling unit and described adventitia.

4. the high temperature chute with refrigerating function according to claim 1, it is characterised in that, the pressurized gas after circulating line heat exchange heats up imports residual heat using device through air outlet.

5. the high temperature chute with refrigerating function according to claim 4, it is characterised in that, described residual heat using device is the hotblast stove of iron-smelting blast furnace.

6. the high temperature chute with refrigerating function according to claim 1, it is characterised in that, described chute body is the main iron hook of iron-smelting blast furnace, Zhigou or slag runner.

7. the high temperature chute with refrigerating function according to claim 1, it is characterised in that, described fire resistant infilling is mould material or ramming mass.