CN220187446U - Dust collection cover of electric furnace - Google Patents

Abstract

The utility model belongs to the field of metallurgical equipment, and particularly relates to a dust collection cover of an electric furnace. The electric furnace dust collection cover comprises a smoke pipe, a square rounding, an outer shell and an inner shell; the outer shell and the inner shell form an inverted concave interlayer cavity, and the smoke tube is communicated with the interlayer cavity through a square circle; the middle upper part of the inner shell is provided with a plurality of round table-shaped holes, and the opening area of one surface of the hole, close to the outer shell, of the inner shell is larger than the opening area of the other surface of the inner shell; the central axis of the round table-shaped hole points to 1/2-2/3 of the height of the interior of the electric furnace dust collection cover; the central line of the smoke tube is positioned at 1/2-2/3 of the height of the dust collection cover of the electric furnace. Compared with the traditional side dust collection cover, the dust collection cover has the advantages that the structure of the inner shell is mainly used for guaranteeing that the smoke in the dust collection cover flows towards the suction port, improving the dust collection efficiency and further better realizing the organized treatment and standard emission of the dust-containing smoke.

Description

Dust collection cover of electric furnace

Technical Field

The utility model belongs to the field of metallurgical equipment, and particularly relates to a dust collection cover of an electric furnace.

Background

The induction furnace is widely applied to nonferrous metal copper and alloy melting production thereof. Taking an intermediate frequency furnace induction furnace for smelting other nonferrous metal alloys as an example, the furnace charge added into the induction furnace usually contains greasy dirt, dust and oxide skin, a great amount of smoke dust is generated in the process of melting metal, deslagging, spheroidizing and discharging metal liquid, and zinc or tin oxide is also contained in the smoke dust, so that the smoke dust generated in the melting operation of the intermediate frequency induction furnace is extremely harmful to human bodies and the environment. In order to prevent metal oxidation of the smelting furnace during smelting copper and copper alloy, the surface of the smelting furnace needs to be covered with a small amount of reducing agent such as coal, so that a small amount of smoke dust is generated and needs to be recycled. Therefore, no matter the intermediate frequency furnace or the industrial frequency furnace, no matter the new electric furnace or the old electric furnace, the necessary fume collecting and treating device is matched under the current environmental protection requirement.

To solve the problem of the smoke of the induction furnace, the effective trapping of the smoke is needed to be performed at first, and the smoke is prevented from escaping from the furnace mouth. The good dust hood needs to ensure the following conditions: (1) The process operation of the production induction furnace and the observation of operators on the furnace conditions are not affected; (2) The normal operation requirement of production equipment is met, and the overhaul of the production equipment is not influenced; (3) The high-strength steel has enough rigidity, strength and stability, and avoids deformation when heated in a period of high Wen Ouchang; (4) The shape design is to effectively organize the flow of the flue gas in the cover to the direction of the suction port; and (5) the welding position of the dust hood is sealed well.

The existing dust collection covers in China have various top suction type, side suction type, rotary type, tornado type and the like according to different air suction modes, basically can meet the conditions (1) - (3), but have slightly poor effect in effectively organizing the flow of the flue gas in the cover towards the direction of the suction port, and can not solve the flue gas problem of the electric furnace well.

Disclosure of Invention

The utility model aims to solve the problems, improves the side suction type dust hood on the premise of not influencing the normal production operation of the electric furnace, more effectively captures the outlet flue gas of the electric furnace, and realizes the organized treatment and standard emission of the dust-containing flue gas.

In order to achieve the above purpose, the utility model provides an electric furnace dust collection cover, which comprises a smoke pipe, a square rounding, an outer shell and an inner shell;

the smoke pipe is connected with an external smoke treatment facility;

the outer shell and the inner shell form an inverted concave interlayer cavity, and the smoke tube is communicated with the interlayer cavity through a square circle;

the middle upper part of the inner shell is provided with a plurality of round table-shaped holes, the opening area of one surface of the inner shell, which is close to the outer shell, is larger than the opening area of the other surface of the inner shell, and the opening area of any surface of the inner shell is gradually reduced from the upper part to the middle part of the inner shell;

the central axis of the round table-shaped hole points to 1/2-2/3 of the height of the interior of the electric furnace dust collection cover;

the central line of the smoke tube is positioned at 1/2-2/3 of the height of the dust collection cover of the electric furnace;

wherein the height of the dust collection cover of the electric furnace relative to the furnace mouth plane of the electric furnace is h, and the height of the furnace mouth plane is 0.

The utility model has the beneficial effects that:

compared with the traditional side dust collection cover, the dust collection cover has the advantages that the structure of the inner shell is mainly used for guaranteeing that the smoke in the dust collection cover flows towards the suction port, improving the dust collection efficiency and further better realizing the organized treatment and standard emission of the dust-containing smoke.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular descriptions of exemplary embodiments of the utility model as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the utility model.

Fig. 1 shows a schematic front view of an embodiment of the utility model.

Fig. 2 shows a schematic cross-sectional view of a front view of an inner housing of one embodiment of the present utility model.

FIG. 3 shows a schematic cross-sectional view of a top view of one embodiment of the present utility model.

Reference numerals illustrate:

1-smoke tube, 2-square rounding, 3-outer shell and 4-inner shell.

Detailed Description

Preferred embodiments of the present utility model will be described in more detail below. While the preferred embodiments of the present utility model are described below, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

The utility model provides an electric furnace dust collection cover which comprises a smoke pipe, a square rounding, an outer shell and an inner shell; wherein square rounding is a pipeline connecting device with one end being round and the other end being rectangular, which is conventionally adopted by a person skilled in the art, and can be obtained by market;

the smoke pipe is connected with an external smoke treatment facility; the external flue gas treatment facility can be a dust remover which is commonly adopted by a person skilled in the art;

the outer shell and the inner shell form an inverted concave interlayer cavity, and the smoke tube is communicated with the interlayer cavity through a square circle; the inverted concave shape is similar to the inverted concave shape in top view, and is not limited to the inverted concave shape, and can be arranged between the inverted concave shape and the inverted concave shape, so long as the opening meets the production operation requirement of a person in the field and the working condition of a furnace mouth can be observed at any time;

the upper middle part of the inner shell is provided with a plurality of round table-shaped holes, the opening area of one surface of the holes, close to the outer shell, of the inner shell is larger than the opening area of the other surface of the inner shell, and the dust collection cover of the electric furnace is beneficial to increasing the air suction speed, because the air flow is sucked from outside to inside through the smoke pipe, and when passing through the inner shell, the air flow speed is increased along with the reduction of the opening section of the holes of the inner shell; the opening area of any surface of the inner shell is gradually reduced from the upper part to the middle part of the inner shell; the opening area refers to the area of one surface of the inner shell, namely the area of the upper surface or the lower surface of the round table-shaped hole; wherein, no matter for the surface of the inner shell close to one side of the outer shell (namely, the side facing away from the furnace mouth area) or the surface of the inner shell far away from one side of the outer shell (namely, the side facing towards the furnace mouth area), the opening area of the hole is gradually reduced from the upper part to the middle part of the inner shell, for example, from the h height to the 1/2h height; the dust collection cover of the electric furnace is h in height relative to the furnace mouth plane of the electric furnace, and the height of the furnace mouth plane is 0;

the central axis of the round table-shaped hole points to 1/2-2/3 of the height of the inside of the electric furnace dust collection cover, and the central axis of the smoke tube is positioned at 1/2-2/3 of the height of the electric furnace dust collection cover, so that the smoke in the electric furnace dust collection cover can flow towards the suction port in the rising process, and the smoke collection efficiency is further improved.

Under the premise of neglecting the side opening of the interlayer cavity, the electric furnace dust collection cover is provided with a symmetrical shaft penetrating through the smoke pipe 1, the square rounding 2, the outer shell 3 and the inner shell 4, and the central axis intersection point of the central line of the smoke pipe and the central axis of the furnace mouth plane of the electric furnace in the vertical direction is i, so that the central axis of the round table-shaped hole is ensured to pass through the intersection point i, and the best air suction effect can be obtained. If the central line of the smoke tube is positioned at the 2/3 height of the electric furnace dust collection cover, the intersection point of the central line of the smoke tube and the central line of the furnace mouth area in the vertical direction is i, and the central line of the hole passes through the intersection point i.

In the technical scheme, the electric furnace comprises an induction furnace, a non-resistance furnace, an electric arc furnace or a plasma furnace, and the induction furnace can be a high-frequency furnace, an intermediate-frequency furnace or a power frequency furnace.

Preferably, the diameter of the smoke tube is 300-800mm.

Preferably, the square rounding has the following dimensions:

∮300-800×1000mm-∮800-800×1000mm。

preferably, the outer case and the inner case are each selected from steel plates.

Preferably, the thicknesses of the outer shell and the inner shell satisfy the condition i and/or the condition ii:

condition I: the thickness of the outer shell is 3-8mm, and the thickness of the inner shell is 8-16mm;

condition II: the thickness of the inner shell is 1.5-2 times of that of the outer shell.

The inner shell adopts the thick steel plate to ensure that the dust collection cover has enough rigidity, strength and stability, prevents deformation caused by long-term heating, and is convenient for forming irregular holes in the inner shell. Other materials which can meet the requirements of high temperature resistance, certain rigidity, strength and stability can be selected as an inner shell or an outer shell by a person skilled in the art as required.

Preferably, the width of the interlayer cavity is 200-500mm.

Preferably, the openings of the holes on either side of the inner housing each have an average diameter of 50-200mm.

When the electric furnace dust collection cover is used, the electric furnace dust collection cover can be fixed on the upper part of the electric furnace around the furnace mouth area of the electric furnace, for example, the electric furnace dust collection cover is semi-enclosed and stands on a furnace table, and the connection mode can be selected for welding or other modes which can be selected by a person skilled in the art; the dust collection cover of the electric furnace is in a lateral air suction mode.

Example 1

The embodiment provides a dust collection cover of an electric furnace.

Referring to fig. 1-3, fig. 1 shows a schematic front view of an embodiment of the present utility model, fig. 2 shows a schematic cross-sectional view of a front view of an inner housing of an embodiment of the present utility model, and fig. 3 shows a schematic cross-sectional view of a top view of an embodiment of the present utility model.

The dust collection cover of the electric furnace is fixed around the furnace mouth area of the electric furnace and is semi-enclosed and erected on the furnace platform, and the air suction mode is side air suction. Wherein, the electric furnace is a power frequency furnace with rated capacity of 4.5t, rated power of 450kW and maximum power of 500kW, and the power frequency furnace is mainly used for melting red copper, and the air quantity is 12000-15000Nm during working ³ /h。

The electric furnace dust collection cover comprises a smoke pipe 1, a square rounding 2, an outer shell 3 and an inner shell 4; wherein the diameter of the smoke tube 1 is 600mm, the square rounding 2 (phi 600-800 multiplied by 1000 mm), the outer shell 3 is a 5mm steel plate, and the inner shell 4 is a 10mm thick steel plate.

The smoke tube is connected with an external dust remover; the outer shell 3 and the inner shell 4 form an inverted concave interlayer cavity, the width of the interlayer cavity is 300mm, the smoke tube 1 and the interlayer cavity are communicated through the square rounding 2, and all the parts are connected or communicated in a welding mode.

The dust collection cover of the electric furnace is h relative to the furnace mouth plane of the electric furnace, the height of the furnace mouth plane is 0, a plurality of round table-shaped holes are formed in the 1/2h height position-h height position of the inner shell 4, and the opening area of one surface of the inner shell 4, which is close to the outer shell 3, is larger than that of the other surface of the inner shell; the opening area of any surface of the inner shell 4 is gradually reduced from the upper part to the middle part of the inner shell (i.e. the h height is 1/2h height). Specifically, the hole is formed on one surface of the inner shell 4 close to the outer shell 3, and the opening formed by the hole is gradually reduced from the diameter of 200mm to the diameter of 70mm at the height of h to 1/2 h; the opening formed on the other side of the inner shell 4 gradually decreases from the diameter of 150mm to the diameter of 50mm from the h height to 1/2h height.

The central axis of the round table-shaped hole points to the 2/3 height position of the interior of the electric furnace dust collection cover, and the central axis of the smoke tube is positioned at the 2/3 height position of the electric furnace dust collection cover.

On the premise of neglecting the side opening of the interlayer cavity, the electric furnace dust collection cover is provided with a symmetrical shaft penetrating through the smoke pipe 1, the square rounding 2, the outer shell 3 and the inner shell 4, at the moment, the intersection point of the central line of the smoke pipe 1 and the central line (namely, the vertical dotted line in fig. 2) of the furnace mouth plane of the electric furnace in the vertical direction is i, and the extension line of the central line of each round table-shaped hole passes through the intersection point i.

Comparative example 1

The difference from the embodiment 1 is that the round table-shaped holes of the dust collection cover of the electric furnace of the embodiment 1 are replaced by cylindrical holes, and the volumes of the cylinder and the round table are ensured to be consistent.

Comparative example 2

The difference from example 1 is that some existing electric furnace dust hood is adopted, and the main difference of the electric furnace dust hood from example 1 is that only the outer shell has no inner shell, and an inverted concave interlayer cavity is not formed.

Test case

The electric furnace dust collection hoods of example 1, comparative example 1 and comparative example 2 were used to conduct dust collection effect test while ensuring that fans, dust collectors, and the like were unchanged.

The results show that the dust collection efficiency of the example 1 is more than or equal to 98%, the dust collection efficiency of the comparative example 1 is about 95%, and the dust collection efficiency of the comparative example 2 is less than 90%.

The foregoing description of embodiments of the utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.

Claims (9)

1. The electric furnace dust collection cover is characterized by comprising a smoke pipe, a square rounding, an outer shell and an inner shell;

the smoke pipe is connected with an external smoke treatment facility;

the outer shell and the inner shell form an inverted concave interlayer cavity, and the smoke tube is communicated with the interlayer cavity through the square rounding;

the middle upper part of the inner shell is provided with a plurality of round table-shaped holes, the opening area of one surface of the inner shell, which is close to the outer shell, is larger than the opening area of the other surface of the inner shell, and the opening areas of any surface of the inner shell are gradually reduced from the upper part to the middle part of the inner shell;

the central axis of the round table-shaped hole points to 1/2-2/3 of the height of the interior of the electric furnace dust collection cover;

the central line of the smoke tube is positioned at 1/2-2/3 of the height of the electric furnace dust collection cover;

the height of the electric furnace dust collection cover relative to the furnace mouth plane of the electric furnace is h, and the height of the furnace mouth plane is 0.

2. The dust hood for electric furnace according to claim 1, wherein,

the intersection point of the central line of the smoke tube and the central axis of the furnace mouth plane of the electric furnace in the vertical direction is i, and the central axes of all the round table-shaped holes pass through the intersection point i.

3. The electric furnace dust hood according to claim 1, wherein the electric furnace comprises an induction furnace, an arc furnace, or a plasma furnace.

4. The electric furnace dust hood according to claim 1, wherein the diameter of the smoke pipe is 300-800mm.

5. The dust hood for an electric furnace according to claim 1, wherein the square rounding has a size of phi 300-800 x 1000 mm-phi 800-800 x 1000mm.

6. The electric dust collection cover of claim 1, wherein the outer housing and the inner housing are each selected from the group consisting of steel plates.

7. The electric furnace dust hood according to claim 1, characterized in that the thickness of the outer housing and the inner housing satisfies condition i and/or condition ii:

condition I: the thickness of the outer shell is 3-8mm, and the thickness of the inner shell is 8-16mm;

condition II: the thickness of the inner shell is 1.5-2 times of that of the outer shell.

8. The electric dust hood according to claim 1, wherein the interlayer cavity has a width of 200-500mm.

9. The electric dust collection cover according to claim 1, wherein the openings of the holes on either side of the inner housing each have an average diameter of 50-200mm.