Heating device of galvanized strip steel annealing furnace

Abstract

The utility model relates to the technical field of annealing furnace equipment, and provides a heating device of a galvanized strip steel annealing furnace, which comprises a furnace body and a cooling cavity, the cooling cavity is arranged in the furnace body, a conveying roller is mounted in the furnace body, a first motor is mounted on the side surface of the furnace body, and the output end of the first motor is connected with the conveying roller. The fuel gas heating assembly is arranged inside the furnace body, the cooling return air preheating assembly is arranged outside the furnace body and comprises a negative pressure fan, the negative pressure fan is installed at the top of the cooling cavity, a pair of gas cavity plates is arranged in the furnace body, the gas cavity plates are communicated with each other, and a constant-temperature cavity is formed in the furnace body. According to the technical scheme, the problems that in the prior art, a preheating mode of an existing annealing furnace is large in energy consumption, in the annealing treatment process, gas used for cooling is directly discharged, a heat source cannot be recycled, energy consumption is large, and the influence on the surrounding ring is large are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of annealing furnace equipment, and in particular to a heating device for a galvanized strip steel annealing furnace. Background Art

[0002] Annealing furnace is widely used as a heat treatment process in the metallurgical industry, such as cold rolling line, galvanizing line, silicon steel line, etc. Its purpose is to reduce hardness, improve machinability, eliminate tissue defects, etc. The protective gas is passed through the furnace, the main purpose is to prevent the outside air from entering the furnace and causing material oxidation, while maintaining a uniform temperature in the furnace. In the strip continuous hot-dip galvanizing unit, the continuous annealing furnace is one of the main processes in the strip continuous hot-dip galvanizing process section, and it is also the heart of the unit, playing a vital role in the quality and performance of the hot-dip galvanized sheet.

[0003] The current preheating method of the annealing furnace consumes a lot of energy, and during the annealing process, the gas used for cooling is directly discharged, and the heat source cannot be recovered and reused, which consumes a lot of energy and has a greater impact on the surrounding environment.

[0004] Therefore, improvements are made to address the above problems. Utility Model Content

[0005] The utility model proposes a heating device for a galvanized strip steel annealing furnace, which solves the problem that the current preheating method of the annealing furnace in the related technology consumes a lot of energy, and in the process of annealing treatment, the gas used for cooling is directly discharged, and the heat source cannot be recovered and reused, but the energy consumption is large and the impact on the surrounding ring is large.

[0006] The technical solution of the utility model is as follows:

[0007] A furnace body and a cooling chamber, wherein the cooling chamber is arranged inside the furnace body;

[0008] A pair of conveying rollers and a first motor, wherein the conveying rollers are installed inside the furnace body, the first motor is installed on the side surface of the furnace body, and the output end of the first motor is connected to the conveying rollers;

[0009] A gas heating component, wherein the gas heating component is arranged inside the furnace body;

[0010] A cooling return air preheating component is arranged outside the furnace body, and the cooling return air preheating component includes a negative pressure fan, and the negative pressure fan is installed on the top of the cooling cavity. A pair of air cavity plates are arranged in the furnace body, and the air cavity plates are connected to each other. A constant temperature cavity is arranged in the furnace body.

[0011] As a further technical solution, a reflux pipe is connected between the top of the air cavity plate and the top of the constant temperature chamber, a pair of recovery ports are opened on both side surfaces of the furnace body, an air collecting hood is provided on the outer surface of the furnace body, a waste heat recovery pipe is connected to one end of the air collecting hood, a preheating pipe is provided between the air cavity plates, a side port is opened on the inner surface of the cooling chamber, and the side port is communicated with the constant temperature chamber.

[0012] As a further technical solution, the gas heating assembly includes a heating chamber, which is arranged in the furnace body. A number of support rods are arranged on both side surfaces of the furnace body, and the support rods are evenly arranged in a straight line on the inner surface of the furnace body. A gas pipeline is arranged in the furnace body, and a number of gas nozzles are arranged on the top of the gas pipeline.

[0013] As a further technical solution, it also includes a blocking outlet component, which includes a heat insulation layer, which is arranged inside the furnace body, and a cavity is opened in the heat insulation layer. A discharge roller is rotatably connected in the cavity, and discharge ports are opened on both side surfaces of the cavity.

[0014] As a further technical solution, the inner bottom surface of the cavity is an arc-shaped convex structure surface, and the highest point of the convex part of the bottom of the cavity is at the same horizontal height as the bottom surface of the discharge port.

[0015] As a further technical solution, the gas pipeline located in the furnace body is in an annular structure as a whole, and the gas nozzles are evenly distributed in an annular shape on the surface of the gas pipeline.

[0016] As a further technical solution, a pair of conveying rollers rotate synchronously via gears and belt transmission.

[0017] As a further technical solution, the support rod is in a cylindrical structure.

[0018] The working principle and beneficial effects of the utility model are:

[0019] The utility model is provided with a cooling return air preheating component, and a cooling chamber, a constant temperature chamber, a reflux pipe, an air chamber plate and a preheating pipe are arranged in the furnace body. The hot air generated after the strip steel is cooled by the negative pressure fan in the cooling chamber enters the constant temperature chamber through the side port and then enters the air chamber plate through the reflux pipe, and can cover the surface of the strip steel through the air holes of the air chamber plate. In conjunction with the preheating pipe, the preheating effect of the strip steel can be accelerated and energy can be saved. A recovery port and an air collecting hood are also arranged, which can recover the final waste heat of the gas and transport it to the heat exchange equipment through the waste heat recovery pipe, so as to make full use of energy and have good use effect and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is the axonometric drawing of the utility model;

[0023] Figure 3 This is an axonometric drawing from another perspective of the utility model;

[0024] Figure 4 It is a cross-sectional view of the utility model;

[0025] In the figure: 1. furnace body; 2. cooling chamber; 3. conveying roller; 4. first motor; 5. cooling return air preheating assembly; 5-1. negative pressure fan; 5-2. air cavity plate; 5-3. constant temperature chamber; 5-4. return pipe; 5-5. recovery port; 5-6. gas collecting hood; 5-7. waste heat recovery pipe; 5-8. preheating pipe; 5-9. side port; 6. gas heating assembly; 6-1. heating chamber; 6-2. support rod; 6-3. gas pipeline; 6-4. gas nozzle; 7. barrier outlet assembly; 7-1. insulation layer; 7-2. cavity; 7-3. discharge roller; 7-4. discharge port. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] like Figure 1~Figure 4 As shown, this embodiment provides a heating device for a galvanized steel strip annealing furnace, comprising

[0028] A furnace body 1 and a cooling chamber 2, wherein the cooling chamber 2 is arranged inside the furnace body 1;

[0029] A pair of conveying rollers 3 and a first motor 4, wherein the conveying rollers 3 are installed inside the furnace body 1, and the first motor 4 is installed on the side surface of the furnace body 1, and the output end of the first motor 4 is connected to the conveying rollers 3;

[0030] A gas heating component 6, which is arranged inside the furnace body 1;

[0031] A cooling return air preheating component 5 is arranged outside the furnace body 1. The cooling return air preheating component 5 includes a negative pressure fan 5-1. The negative pressure fan 5-1 is installed on the top of the cooling chamber 2. A pair of air cavity plates 5-2 are arranged in the furnace body 1. The air cavity plates 5-2 are connected to each other. A constant temperature chamber 5-3 is arranged in the furnace body 1. A return pipe 5-4 is connected between the top of the air cavity plate 5-2 and the top of the constant temperature chamber 5-3. A pair of recovery ports 5-5 are provided on both side surfaces of the outside of the furnace body 1. An air collecting hood 5-6 is provided on the outer surface of the furnace body 1. One end of the air collecting hood 5-6 is connected to a waste heat recovery pipe 5-7. A preheating pipe 5-8 is provided between the air cavity plates 5-2. A side port 5-9 is provided on the inner surface of the cooling chamber 2. The side port 5-9 is connected to the constant temperature chamber 5-3.

[0032] In this embodiment, in order to achieve the effect of recovering and preheating the heat of the air during the cooling process, a cooling return air preheating component 5 is designed, and two interconnected air cavity plates 5-2 are arranged inside the inlet direction of the furnace body 1, and a return pipe 5-4 is connected between the top of the air cavity plate 5-2 and the top of the constant temperature chamber 5-3. When the negative pressure fan 5-1 blows air to cool the cooling chamber 2, the cooled hot air can enter the constant temperature chamber 5-3 through the side port 5-9, and then enter the air cavity plate 5-2 through the return pipe 5-4, and then cover the surface of the incoming strip to help preheat and save energy. A recovery port 5-5 is opened on the side surface of the furnace body 1 and an air collecting hood 5-6 is installed. The preheated waste heat gas can be transported to the heat exchange equipment through the waste heat recovery pipe 5-7 at one end of the air collecting hood 5-6 for waste heat utilization.

[0033] Furthermore, the gas heating assembly 6 includes a heating chamber 6-1, which is arranged in the furnace body 1. A plurality of support rods 6-2 are arranged on both side surfaces of the furnace body 1. The support rods 6-2 are evenly arranged along a straight line on the inner surface of the furnace body 1. A gas pipeline 6-3 is arranged in the furnace body 1, and a plurality of gas nozzles 6-4 are arranged on the top of the gas pipeline 6-3.

[0034] In this embodiment, in order to achieve the rapid heating and temperature-raising effect of the steel strip, a gas heating assembly 6 is designed, and a heating chamber 6-1 is arranged in the furnace body 1, and a gas pipeline 6-3 and a plurality of gas nozzles 6-4 are installed inside. The steel strip is subjected to a covering heating treatment by the gas nozzles 6-4, and a plurality of support rods 6-2 are arranged on both sides, which are supported at the bottom of the steel strip to assist in its movement.

[0035] Furthermore, it also includes an outlet blocking component 7, which includes an insulating layer 7-1, which is arranged inside the furnace body 1, and a cavity 7-2 is opened in the insulating layer 7-1, and a discharge roller 7-3 is rotatably connected in the cavity 7-2, and discharge ports 7-4 are opened on both side surfaces of the cavity 7-2.

[0036] In this embodiment, in order to achieve the effect of reducing the discharge of cooling hot gas and facilitating the utilization of waste heat, a blocking outlet assembly 7 is designed. An insulating layer 7-1 is arranged inside the furnace body 1, and a cavity 7-2, a discharge roller 7-3 and a discharge port 7-4 are arranged inside. The gap of the outlet can be reduced to ensure that only the strip steel can pass through, thereby greatly reducing gas discharge.

[0037] Furthermore, the inner bottom surface of the cavity 7-2 is an arc-shaped convex structure surface, and the highest point of the convex part of the bottom of the cavity 7-2 is at the same horizontal height as the bottom surface of the discharge port 7-4.

[0038] In this embodiment, the bottom surface of the cavity 7-2 is supported on the bottom surface of the steel strip by the raised bottom surface, which can reduce the contact area, avoid wear on the steel strip, and control the opening size to reduce hot gas discharge.

[0039] Furthermore, the gas pipeline 6-3 located in the furnace body 1 is annular in structure as a whole, and the gas nozzles 6-4 are evenly distributed on the surface of the gas pipeline 6-3 in a ring shape.

[0040] In this embodiment, the gas nozzles 6-4 on the surface of the gas pipeline 6-3 are distributed more evenly and reasonably through the annular structure distribution, so that the heating of the strip steel is completed quickly.

[0041] Furthermore, the pair of conveying rollers 3 rotate synchronously through gears and belt transmission.

[0042] In this embodiment, the two conveying rollers 3 are driven by gears and belts to keep the effect of synchronous rotation, so as to stably convey the steel strip.

[0043] Furthermore, the support rod 6-2 has a cylindrical structure.

[0044] In this embodiment, the cylindrical structure enables the surface of the support rod 6-2 to enable the strip steel to slide.

[0045] When annealing treatment is required, the strip enters at one side, is conveyed inward by the conveying roller 3, is first heated by the gas nozzle 6-4 on the surface of the gas pipe 6-3, then enters the constant temperature chamber 5-3, and then enters the cooling chamber 2. The negative pressure fan 5-1 on the top starts to dissipate heat, and the hot air enters the constant temperature chamber 5-3 through the side port 5-9, and then enters the air cavity plate 5-2 through the reflux pipe 5-4 and is blown out, covering the surface of the strip, and then is conveyed to the heat exchange equipment through the recovery port 5-5, the gas collecting hood 5-6 and the waste heat recovery pipe 5-7, and the strip is preheated to help the preheating pipe 5-8 save energy consumption. After the strip is cooled, it can be discharged outward through the discharge port 7-4 of the cavity 7-2.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heating device for a galvanized steel strip annealing furnace, characterized in that: include A furnace body (1) and a cooling chamber (2), wherein the cooling chamber (2) is arranged inside the furnace body (1); A pair of conveying rollers (3) and a first motor (4), wherein the conveying rollers (3) are mounted inside the furnace body (1), the first motor (4) is mounted on a side surface of the furnace body (1), and an output end of the first motor (4) is connected to the conveying rollers (3); A gas heating component (6), wherein the gas heating component (6) is arranged inside the furnace body (1); A cooling return air preheating component (5), the cooling return air preheating component (5) is arranged outside the furnace body (1), the cooling return air preheating component (5) comprises a negative pressure fan (5-1), the negative pressure fan (5-1) is installed on the top of the cooling chamber (2), a pair of air cavity plates (5-2) are arranged in the furnace body (1), the air cavity plates (5-2) are connected to each other, and a constant temperature chamber (5-3) is arranged in the furnace body (1).

2. The heating device of the galvanized steel strip annealing furnace according to claim 1, characterized in that: A reflux pipe (5-4) is connected between the top of the air cavity plate (5-2) and the top of the constant temperature chamber (5-3); a pair of recovery ports (5-5) are provided on both side surfaces of the outer side of the furnace body (1); an air collecting hood (5-6) is provided on the outer surface of the furnace body (1); one end of the air collecting hood (5-6) is connected to a waste heat recovery pipe (5-7); a preheating pipe (5-8) is provided between the air cavity plates (5-2); a side port (5-9) is provided on the inner surface of the cooling chamber (2); and the side port (5-9) is communicated with the constant temperature chamber (5-3).

3. The heating device of the galvanized steel strip annealing furnace according to claim 1, characterized in that: The gas heating assembly (6) comprises a heating chamber (6-1), the heating chamber (6-1) being arranged in the furnace body (1), a plurality of support rods (6-2) being arranged on both side surfaces of the furnace body (1), the support rods (6-2) being evenly arranged along a straight line on the inner surface of the furnace body (1), a gas pipeline (6-3) being arranged in the furnace body (1), and a plurality of gas nozzles (6-4) being arranged on the top of the gas pipeline (6-3).

4. The heating device of the galvanized steel strip annealing furnace according to claim 1, characterized in that: The invention also comprises a blocking outlet component (7), wherein the blocking outlet component (7) comprises a heat insulating layer (7-1), wherein the heat insulating layer (7-1) is arranged inside the furnace body (1), wherein a cavity (7-2) is provided inside the heat insulating layer (7-1), wherein a discharge roller (7-3) is rotatably connected inside the cavity (7-2), and discharge ports (7-4) are provided on both side surfaces inside the cavity (7-2).

5. The heating device of the galvanized steel strip annealing furnace according to claim 4, characterized in that: The inner bottom surface of the cavity (7-2) is an arc-shaped convex structure surface, and the highest point of the convex part at the bottom of the cavity (7-2) is at the same horizontal height as the bottom surface of the discharge port (7-4).

6. The heating device of the galvanized steel strip annealing furnace according to claim 3, characterized in that: The gas pipeline (6-3) located in the furnace body (1) is in an annular structure as a whole, and the gas nozzles (6-4) are evenly distributed in an annular shape on the surface of the gas pipeline (6-3).

7. The heating device of a galvanized steel strip annealing furnace according to claim 1, characterized in that: The pair of conveying rollers (3) rotate synchronously via gears and belt transmission.

8. The heating device of the galvanized steel strip annealing furnace according to claim 3, characterized in that: The support rod (6-2) is in a cylindrical structure.

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