A rotary submerged arc furnace iron tapping and fume exhaust system

Abstract

The present invention belongs to the technical field of smoke exhaust equipment for submerged arc furnaces, and specifically discloses a rotary submerged arc furnace iron-tapping smoke exhaust system. The system includes a chute smoke collecting hood, an annular baffle, an annular flue and a plurality of smoke exhaust hoods; the chute smoke collecting hood includes a smoke collecting port and a smoke outlet, the smoke collecting port is fixedly connected above the iron-tapping port of the submerged arc furnace, and the smoke outlet is fixedly connected to the annular baffle; the annular baffle surrounds the periphery of the submerged arc furnace and rotates with the submerged arc furnace together with the chute smoke collecting hood; an annular flue is fixedly arranged on the periphery of the annular baffle, and a plurality of smoke exhaust hoods are fixedly arranged on the outer wall of the annular flue at intervals, and the smoke exhaust hood is connected to the smoke exhaust branch pipe of the dust removal system; the smoke collected by the chute smoke collecting hood passes through the annular baffle into the annular flue, and finally enters the smoke exhaust branch pipe through the smoke exhaust hood at the corresponding position to reach the dust removal system. The present invention can solve the problem of smoke exhaust during iron-tapping of a rotary submerged arc furnace, improve the smoke collection effect of the iron-tapping port, and reduce the power loss of the smoke exhaust fan.

Description

Technical Field

[0001] The invention belongs to the technical field of smoke exhaust equipment for submerged arc furnaces, and in particular relates to a rotary submerged arc furnace iron-tapping smoke exhaust system. Background Art

[0002] Submerged arc furnaces, also known as arc furnaces or resistance furnaces, are mainly used to reduce raw materials such as ore, carbonaceous reducing agents and solvents. Submerged arc furnaces produce a large amount of dusty flue gas during the iron smelting process, especially when the furnace eye is opened and blocked, furnace gas splashing is likely to occur, and high-concentration dusty flue gas is concentrated in a short period of time. If it is not collected and purified in time, it will cause great pollution to the environment. In addition, the flue gas at the tapping point has the characteristics of periodicity and large instantaneous flue gas volume. Tests and tests show that the flue gas injection speed can reach 50m / s during iron tapping, and the injection distance exceeds 3m. In addition, there are many process equipment in the tapping point area, and it is difficult to arrange the smoke hood and flue, which brings great difficulties to the collection of flue gas.

[0003] The rotary submerged arc furnace can effectively improve the uniformity of the material layer distribution in the furnace, and is gradually applied to ferrosilicon submerged arc furnaces. The rotary submerged arc furnace rotates at a certain time period, and the molten iron flows out from the iron outlet, is received by the iron ladle and then processed. The production process of the rotary submerged arc furnace requires the system design such as the connection between the smoke hood and the pipeline system to minimize air leakage, ensure the smoke collection effect and meet environmental protection standards.

[0004] When implementing the technical solution of the present invention, the applicant of the present invention found that the existing iron tapping smoke exhaust system has at least the following problems:

[0005] (1) The tapping hole of a traditional fixed ore-fired furnace is fixed, so the fixed tapping smoke exhaust system cannot solve the problem of the tapping hole of a rotary electric furnace being not fixed; because the tapping hole position of a rotary ore-fired furnace changes with the rotation of the ore-fired furnace, it is impossible to use a traditional fixed smoke hood and flue for centralized dust collection during tapping, which makes it difficult to collect smoke from a rotary ore-fired furnace;

[0006] (2) Conventional tapping smoke collection uses a large smoke hood, which is set above the tapping port. The distance between the smoke hood and the tapping port is too large, resulting in poor smoke collection during the tapping process. In addition, the traditional fixed submerged arc furnace smoke hood cannot change the direction of smoke flow. Due to changes in furnace conditions, the amount of smoke during tapping and exhaust varies. When the power of the exhaust fan is constant, once smoke splashes at the tapping port, due to the high smoke flow rate, even if the fan is fully turned on, it is impossible to achieve the purpose of complete smoke collection and dust removal, which will cause some smoke to be discharged disorderly, polluting the environment.

[0007] (3) Since a large amount of cold air enters the conventional large smoke hood during the process of collecting smoke, the total amount of smoke that needs to be discharged increases significantly, and the power requirement of the smoke exhaust fan increases accordingly, which will increase the fan's electrical power loss during operation; in addition, since the mixed air temperature is low, the smoke temperature will be greatly reduced, causing saturated moisture condensation and precipitation in the smoke in the pipeline and purification links, resulting in increased risks of pipeline blockage, filter bag sticking, etc., affecting the normal operation of production.

[0008] The above problems make it difficult for the current rotary ore-fired furnace to achieve a good iron-tapping smoke exhaust effect. There is an urgent need for an iron-tapping smoke exhaust system with good smoke exhaust and dust removal effects and suitable for rotary ore-fired furnaces. Summary of the invention

[0009] The present invention aims to solve at least one technical problem existing in the prior art or related technology, and provides a rotary submerged arc furnace iron-tapping smoke exhaust system to solve the iron-tapping smoke exhaust problem of the rotary submerged arc furnace, improve the smoke collection effect at the iron-tapping port, and reduce the power loss of the smoke exhaust fan.

[0010] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0011] A rotary submerged arc furnace iron-tapping smoke exhaust system comprises a chute smoke collecting hood, an annular baffle, an annular flue and a plurality of smoke exhaust hoods;

[0012] The chute smoke collecting hood comprises a smoke collecting port and a smoke outlet, the smoke collecting port of the chute smoke collecting hood is fixedly connected above the tapping port of the ore-heating furnace, and the smoke outlet of the chute smoke collecting hood is fixedly connected to the annular baffle plate; the annular baffle plate surrounds the periphery of the ore-heating furnace and rotates with the chute smoke collecting hood along with the ore-heating furnace;

[0013] The annular flue is fixedly arranged on the periphery of the annular baffle, and a plurality of smoke exhaust hoods are fixedly arranged at intervals on the outer side wall of the annular flue, and the smoke exhaust hoods are connected to the smoke exhaust branch pipe of the dust removal system; the smoke collected by the chute smoke collecting hood passes through the annular baffle into the annular flue, and finally enters the smoke exhaust branch pipe through the smoke exhaust hood at the corresponding position to reach the dust removal system.

[0014] Furthermore, a gap of 80-150 mm is left at the joint between the annular baffle and the annular flue.

[0015] Furthermore, an annular outer smoke hood with an N-shaped cross section is fixedly arranged above the annular flue, and the annular outer smoke hood can collect smoke overflowing from the molten iron ladle and enter the annular flue through the gap between the annular flue and the annular baffle.

[0016] Furthermore, a plurality of grilles are arranged at intervals inside the annular flue, and two adjacent grilles gather the smoke collected by the chute smoke collecting hood and discharge it from the corresponding smoke exhaust hood.

[0017] Furthermore, the smoke exhaust hood is a rectangular parallelepiped pipe, and the width of the smoke exhaust port of the smoke exhaust hood is smaller than the distance between two corresponding adjacent grilles.

[0018] Furthermore, the chute smoke collecting hood includes a trumpet-shaped smoke collecting port and a square smoke outlet;

[0019] The smoke collecting port comprises two triangular wing plates located on both sides, a top plate fixed to the upper ends of the two triangular wing plates, and a rectangular extension tube formed by the two triangular wing plates extending upwards;

[0020] The smoke outlet comprises a rectangular smoke guide tube, and an inclination angle greater than 90° and less than 180° is provided between the rectangular smoke guide tube and the rectangular extension tube of the smoke collecting outlet.

[0021] Furthermore, an installation groove is provided above the iron outlet of the electric arc furnace; the rear end of the smoke collecting port of the chute smoke collecting hood is embedded in the installation groove of the electric arc furnace, and the bottom ends of the two triangular wing plates of the smoke collecting port are fixedly installed on the iron outlet, so that the smoke collecting port of the chute smoke collecting hood is vertically covered on the iron outlet.

[0022] Furthermore, a valve for controlling the closing or opening of the smoke exhaust branch pipe is provided on the smoke exhaust branch pipe connected to the smoke exhaust hood.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] (1) The iron-tapping smoke exhaust system of the present invention is provided with an annular baffle plate around the electric furnace, the annular baffle plate is fixedly connected to a closed chute smoke collecting hood, the chute smoke collecting hood is fixed above the iron-tapping port and rotates with the electric furnace; an annular flue is provided on the outer side of the annular baffle plate, the smoke collected by the chute smoke collecting hood enters the annular flue through the annular baffle plate, and finally enters the dust removal system through the smoke exhaust hood provided on the annular flue and the smoke exhaust branch pipe, thereby effectively solving the iron-tapping smoke exhaust problem when the iron-tapping port of the rotary ore-fired furnace is not fixed;

[0025] (2) The iron-tapping smoke exhaust system of the present invention is fixedly provided with a trumpet-shaped, variable-diameter, closed chute smoke collecting hood above the iron-tapping port of the ore-heating furnace. The top of the chute smoke collecting hood is provided with a rectangular smoke guide pipe to guide the smoke into the annular flue. A grille is provided in the annular flue. The grille can gather and fix the collected smoke in a small range to facilitate discharge from the smoke exhaust hood. The closed iron-tapping smoke exhaust system with the above-mentioned special structural design can generate a negative pressure zone in the chute smoke collecting hood and the annular flue. The pressure difference in different areas can change the movement direction and movement trajectory of the smoke and furnace gas, prevent high-speed smoke and furnace gas from splashing and overflowing, so that the amount of smoke generated at the iron-tapping port can be effectively collected and directionally discharged, so as to realize efficient and accurate directionally exhausting of smoke from the iron-tapping port of the ore-heating furnace, and completely solve the dust and environmental protection problem of smoke in the production workshop of the ore-heating furnace.

[0026] (3) The iron-out smoke exhaust system of the present invention adopts a trumpet-shaped, variable-diameter, closed chute smoke collection hood connected to the annular flue. All the collected smoke enters the annular flue, and only a small amount of air is mixed in. At the same time, the design of the annular flue with a grille inside can further reduce the amount of mixed cold air, thereby effectively avoiding the problems of large smoke volume and easy condensation caused by the mixing of a large amount of cold air, further achieving the purpose of reducing the power consumption of the fan, avoiding the risks of pipeline blockage and filter bag sticking caused by smoke condensation, and improving the production environment of the workshop while ensuring the normal operation of production and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a rotary submerged arc furnace iron-tapping and fume exhaust system according to an embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of the assembly structure of the annular baffle plate and the chute smoke collecting cover according to an embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of the internal structure of the annular flue in the iron-tapping and smoke exhaust system of the rotary submerged arc furnace according to an embodiment of the present invention;

[0030] Figure 4 It is a structural schematic diagram of a chute smoke collecting hood according to an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the installation structure of the chute smoke collector according to an embodiment of the present invention;

[0032] Markings in the figure: 1-submerged arc furnace; 2-annular baffle; 3-annular flue; 4-iron outlet; 5-chute smoke collecting hood, 501-rectangular smoke guide pipe; 502-triangular wing plate; 503-top plate, 504-rectangular extension pipe; 6-exhaust hood; 7-grid; 8-annular outer smoke hood. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0036] Example 1

[0037] Combination Figure 1-2 As shown, an embodiment of the present invention provides a rotary submerged arc furnace iron-tapping smoke exhaust system, comprising a chute smoke collecting hood 5, an annular baffle plate 2, an annular flue 3 and a plurality of smoke exhaust hoods 6; the chute smoke collecting hood 5 comprises a smoke collecting port and a smoke outlet, the smoke collecting port of the chute smoke collecting hood 5 is fixedly connected above the iron-tapping port 4 of the submerged arc furnace, and the smoke outlet of the chute smoke collecting hood 5 is fixedly connected to the annular baffle plate 2; the annular baffle plate 2 surrounds the periphery of the submerged arc furnace 1, and rotates with the submerged arc furnace 1 together with the chute smoke collecting hood 5;

[0038] The annular flue 3 is fixedly arranged on the periphery of the annular baffle plate 2, and a plurality of exhaust hoods 6 are fixedly arranged at even intervals on the outer wall of the annular flue 3, and the exhaust hoods 6 are connected to the exhaust branch pipe of the dust removal system; the smoke collected by the chute smoke collecting hood 5 passes through the annular baffle plate 2 and enters the annular flue 3, and finally enters the exhaust branch pipe through the exhaust hood 6 at the corresponding position to reach the dust removal system, so as to solve the problem of smoke exhaust at the iron outlet of the rotary ore-fired furnace that is not fixed, and improve the production environment.

[0039] Example 2

[0040] The embodiment of the present invention makes the following improvements on the basis of the above embodiment:

[0041] A gap of 100 mm is left at the joint between the annular baffle plate 2 and the annular flue 3; an annular outer smoke hood 8 is fixedly arranged above the annular flue 3, and the annular outer smoke hood 8 can collect the smoke overflowing from the molten iron ladle and enter the annular flue through the gap between the annular flue 3 and the annular baffle plate 2.

[0042] In the embodiment of the present invention, a gap of 80-150 mm is left at the joint between the annular baffle plate 2 and the annular flue 3, so that the annular baffle plate 2 and the chute smoke collecting hood 5 rotate together with the electric arc furnace 1, and the set gap can avoid rotational interference between the annular baffle plate 2 and the fixed annular flue 3; at the same time, an annular outer smoke hood 8 with an n-shaped cross-section is fixedly arranged above the annular flue 3, and the annular outer smoke hood 8 can collect the flue gas overflowing from the molten iron ladle, and enter the annular flue through the gap between the annular flue 3 and the annular baffle plate 2, so as to avoid the escape of the flue gas; in addition, the annular baffle plate 2 can effectively block the outside wind and cold air from entering the annular flue, so that a relatively high negative pressure state is maintained in the flue, which is conducive to smoke exhaust, and at the same time, it can avoid the increase of smoke exhaust volume and fan power consumption caused by the entry of cold air, and avoid the risks of production accidents such as smoke condensation, pipe blockage, and filter bag sticking caused by the entry of cold air.

[0043] Example 3

[0044] The embodiment of the present invention makes the following improvements on the basis of the above embodiment:

[0045] like Figure 3 As shown, a plurality of grilles 7 are arranged at intervals inside the annular flue, and two adjacent grilles 7 gather the smoke collected by the chute smoke hood 5 into a smaller space and discharge it from the corresponding smoke exhaust hood 6; the smoke exhaust hood 6 is a rectangular pipe, and the width of the smoke exhaust port of the smoke exhaust hood 6 is smaller than the spacing between the corresponding two adjacent grilles 7, so as to facilitate the collection and discharge of smoke.

[0046] In an embodiment of the present invention, a valve for controlling the closing or opening of the smoke exhaust branch pipe is provided on the smoke exhaust branch pipe connected to the smoke exhaust hood 6; when the electric arc furnace 1 stops at one of the smoke exhaust hoods 6 to exhaust smoke during iron tapping, the valve on the smoke exhaust branch pipe of the corresponding smoke exhaust hood 6 is in an open state, and the other smoke exhaust hoods 6 are in a closed state, thereby realizing directional smoke exhaust and improving the smoke exhaust efficiency. At the same time, with the help of the grille 7 arranged inside the annular flue, the collected smoke can be gathered and fixed in a smaller range at the entrance of the corresponding smoke exhaust hood 6, further promoting the discharge of smoke from the corresponding smoke exhaust hood 6.

[0047] Example 4

[0048] The embodiment of the present invention makes the following improvements on the basis of the above embodiment:

[0049] like Figure 4As shown, the chute smoke collecting cover 5 includes a trumpet-shaped smoke collecting port and a square smoke outlet;

[0050] The smoke collecting port includes two triangular wing panels 502 located on both sides, a top plate 503 fixed on the upper ends of the two triangular wing panels 502, and a rectangular extension tube 504 formed by the two triangular wing panels 502 extending upward; the smoke outlet includes a rectangular smoke guide tube 501, and an inclination angle greater than 90° and less than 180° is provided between the rectangular smoke guide tube 501 and the rectangular extension tube 504 of the smoke collecting port.

[0051] like Figure 5 As shown, a mounting groove is opened above the tapping port of the ore-heating furnace 1; the rear end of the smoke collecting port of the chute smoke collecting hood 5 is embedded and installed in the mounting groove of the ore-heating furnace 1, and the bottom ends of the two triangular wing plates 502 of the smoke collecting port are fixedly installed on the tapping port 4, so that the smoke collecting port of the chute smoke collecting hood 5 is directly and vertically covered on the tapping port 4; conventional tapping smoke collection adopts a large smoke hood, which is arranged above the tapping port. The distance between the smoke hood and the tapping port is too large, which will lead to poor smoke collection effect during the tapping process. The smoke collecting port of the chute smoke collecting hood 5 of the embodiment of the present invention is directly and vertically covered on the tapping port 4 at zero distance, which can effectively prevent high-speed smoke and furnace gas from splashing and overflowing, and effectively improve the tapping smoke exhaust effect.

[0052] The iron-tapping smoke exhaust system of the embodiment of the present invention is equipped with a trumpet-shaped, variable-diameter, closed chute smoke collecting hood fixedly arranged above the iron-tapping port of the electric arc furnace. The top of the chute smoke collecting hood is provided with a rectangular smoke guide pipe 501, which is conducive to guiding the smoke into the annular flue 3. A grille 7 is provided in the annular flue 3. The grille 7 fixes the collected smoke in a small range to facilitate discharge from the smoke outlet of the smoke exhaust hood. The closed iron-tapping smoke exhaust system with the above-mentioned special structural design can generate a negative pressure zone in the chute smoke collecting hood and the flue. The pressure difference in different areas can change the movement direction and trajectory of the smoke and furnace gas, prevent high-speed smoke and furnace gas from splashing and overflowing, so that the amount of smoke generated at the iron-tapping port can be effectively collected and directionally discharged, so as to realize efficient and precise directionally exhaust of smoke at the iron-tapping port of the electric furnace, and completely solve the smoke and dust environmental protection problem in the production workshop of the electric arc furnace.

[0053] The above description is only an embodiment of the present application and is not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the scope of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotary submerged arc furnace iron-tapping fume exhaust system, characterized in that: It comprises a chute smoke collecting hood (5), an annular baffle (2), an annular smoke duct (3) and a plurality of smoke exhaust hoods (6); The chute smoke collecting hood (5) comprises a smoke collecting port and a smoke outlet, the smoke collecting port of the chute smoke collecting hood (5) is fixedly connected above the tapping port (4) of the ore-heating furnace, and the smoke outlet of the chute smoke collecting hood (5) is fixedly connected to the annular baffle plate (2); the annular baffle plate (2) surrounds the periphery of the ore-heating furnace (1), and rotates with the chute smoke collecting hood (5) along with the ore-heating furnace (1); The annular flue (3) is fixedly arranged on the periphery of the annular baffle plate (2), and a plurality of exhaust hoods (6) are fixedly arranged at intervals on the outer wall of the annular flue (3), and the exhaust hoods (6) are connected to the exhaust branch pipe of the dust removal system; the smoke collected by the chute smoke collecting hood (5) passes through the annular baffle plate (2) into the annular flue (3), and finally enters the exhaust branch pipe through the exhaust hood (6) at the corresponding position to reach the dust removal system; A plurality of grilles (7) are arranged at intervals inside the annular flue, and two adjacent grilles (7) gather the smoke collected by the chute smoke collecting hood (5) and discharge it from the corresponding smoke exhaust hood (6).

2. A rotary submerged arc furnace iron-tapping fume exhaust system according to claim 1, characterized in that: A gap of 80-150 mm is left at the joint between the annular baffle plate (2) and the annular flue (3).

3. A rotary submerged arc furnace iron-tapping fume exhaust system according to claim 2, characterized in that: An annular outer smoke hood (8) having an N-shaped cross section is fixedly arranged above the annular flue (3); the annular outer smoke hood (8) can collect smoke overflowing from the molten iron ladle and enter the annular flue through the gap between the annular flue (3) and the annular baffle (2).

4. A rotary submerged arc furnace iron-tapping fume exhaust system according to claim 3, characterized in that: The smoke exhaust hood (6) is a rectangular parallelepiped pipe, and the width of the smoke exhaust port of the smoke exhaust hood (6) is smaller than the distance between two corresponding adjacent grilles (7).

5. A rotary submerged arc furnace iron-tapping fume exhaust system according to claim 1 or 2, characterized in that: The chute smoke collecting cover (5) comprises a trumpet-shaped smoke collecting port and a square smoke outlet; The smoke collecting port comprises two triangular wing plates (502) located on two sides, a top plate (503) fixed on the upper ends of the two triangular wing plates (502), and a rectangular extension tube (504) formed by the two triangular wing plates (502) extending upwards; The smoke outlet comprises a rectangular smoke guide pipe (501), and an inclination angle greater than 90° and less than 180° is provided between the rectangular smoke guide pipe (501) and a rectangular extension pipe (504) of the smoke collecting outlet.

6. A rotary submerged arc furnace iron-tapping fume exhaust system according to claim 5, characterized in that: A mounting groove is provided above the tap hole of the ore-heating furnace (1); the rear end of the smoke collecting port of the chute smoke collecting hood (5) is embedded and installed in the mounting groove of the ore-heating furnace (1), and the bottom ends of the two triangular wing plates (502) of the smoke collecting port are fixedly installed on the tap hole (4), so that the smoke collecting port of the chute smoke collecting hood (5) vertically covers the tap hole (4).

7. A rotary submerged arc furnace iron-tapping fume exhaust system according to claim 1 or 2, characterized in that: A valve for controlling the closing or opening of the smoke exhaust branch pipe is arranged on the smoke exhaust branch pipe connected to the smoke exhaust hood (6).

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