Iron oxide calcining furnace based on oxygen waste heat recovery

Abstract

The utility model discloses an iron oxide calcining furnace based on oxygen waste heat recovery, which comprises a transversely arranged fixed furnace body, a rotating roller is arranged in the fixed furnace body, a calcining area is reserved between the rotating roller and the inner side furnace wall of the fixed furnace body, two sides of the rotating roller are provided with rotating shafts, the rotating shafts correspondingly extend out of the fixed furnace body, and the rotating shafts are arranged in the calcining area. And a rotating motor is correspondingly mounted on the left rotating shaft. The waste heat recovery pipe is arranged in the device, collected waste heat is injected into the solid furnace body for calcination of ferric oxide, energy can be effectively saved, and then the calcination effect can be effectively improved by being matched with other arranged heating elements and the like; according to the device, the area between the fixed furnace body and the rotating roller is the calcining area, the material stirring plate installed on the rotating roller can correspondingly achieve the material stirring function, ferric oxide can be evenly placed in the calcining area, and the calcining effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of iron oxide calcining furnace technology, specifically an iron oxide calcining furnace based on oxygen waste heat recovery. Background Technology

[0002] In the prior art, iron oxide calcining furnaces are devices used to convert iron-containing compounds (such as ferric hydroxide, ferrous carbonate, etc.) into iron oxide through high-temperature calcination. Existing iron oxide calcining furnaces typically include the following types:

[0003] Rotary kiln calcining furnace: This is a common type of iron oxide calcining furnace. Its furnace body is an inclined rotating cylinder. Raw materials are added from the upper end and, as the cylinder rotates, gradually move towards the lower end under gravity, completing the calcination process during this movement. Rotary kiln calcining furnaces have advantages such as large production capacity, stable operation, and uniform temperature, making them suitable for large-scale iron oxide production.

[0004] Tunnel kiln calcining furnace: A tunnel kiln is a continuous calcining furnace with a tunnel-shaped furnace body. Raw materials move within the tunnel in a specific manner, passing through different temperature zones to complete calcination. The advantages of tunnel kilns include automated production, precise temperature control, stable product quality, and suitability for producing high-quality iron oxide products.

[0005] Box-type calcining furnace: The structure of a box-type calcining furnace is relatively simple, resembling a box, with raw materials placed inside for calcination. It is suitable for small-batch, multi-variety iron oxide production, offering advantages such as high flexibility and low investment costs, but its production efficiency is relatively low.

[0006] Among the aforementioned technical equipment, the most commonly used calcining furnace is usually the rotary calcining furnace. In addition, other calcining furnaces with different structures have been set up on the basis of the existing rotary calcining furnaces. For example, the "calcining furnace for iron oxide production" disclosed in the authorization announcement number CN217403107U uses two furnace bodies, one inside and one outside, for calcination, which has a better calcination effect.

[0007] However, existing calcination equipment usually has the following drawbacks. On the one hand, the structure is relatively complex, especially the rotary structure, which usually needs to ensure the rotation of the inner and outer furnace bodies. The unreasonable structural design affects the calcination effect. On the other hand, the temperature is uneven during calcination and the temperature source setting is problematic. Existing technologies usually use the heat generated internally as the heat source for calcination, instead of using the waste heat generated by other equipment, which is a waste of energy. In addition, the location of the heat source equipment is not reasonable, resulting in uneven heat distribution and poor calcination effect.

[0008] Therefore, in order to solve the above problems, it is necessary to develop an iron oxide calcining furnace with a reasonable structure, energy saving, and uniform calcination based on oxygen waste heat recovery. Utility Model Content

[0009] The purpose of this invention is to address the shortcomings of existing technologies by providing an iron oxide calcining furnace based on oxygen waste heat recovery; the technical solution is as follows:

[0010] An iron oxide calcining furnace based on oxygen waste heat recovery includes a horizontally arranged fixed furnace body. A rotating roller is arranged inside the fixed furnace body. A calcination area is left between the rotating roller and the inner wall of the fixed furnace body. Rotating shafts are arranged on both sides of the rotating roller. The rotating shafts extend from the fixed furnace body, and a rotating motor is installed on the left rotating shaft.

[0011] The rotating roller is also equipped with several material-pushing plates. The material-pushing plates are evenly spaced and arranged in a radiating pattern. The material-pushing plates extend into the calcination area. The width of the material-pushing plates is the same as the width of the rotating roller, and the length of the material-pushing plates is set accordingly so that the material-pushing plates extend to the inner wall of the fixed furnace body. When the rotating roller rotates, it drives the material-pushing plates to rotate in the calcination area.

[0012] Furthermore, the solid furnace body is also equipped with a waste heat recovery pipe, which injects the recovered heat into the calcination area inside the fixed furnace body, and when the internal rotating roller rotates, the heat is diffused to the entire calcination area through the material feeding plate.

[0013] Furthermore, the waste heat recovery pipes are all installed in the upper half of the fixed furnace body.

[0014] Furthermore, the waste heat recovery pipes are provided in three sets. One set is located at the top of the fixed furnace body, and the other two sets are symmetrically located on both sides of the top of the fixed furnace body. All three sets of waste heat recovery pipes can inject the recovered hot gas into the fixed furnace body.

[0015] Furthermore, the upper end of the fixed furnace body is equipped with a feed inlet and a feed door plate via a hinge assembly, and the lower end of the fixed furnace body is equipped with a discharge outlet and a discharge door plate via a hinge assembly.

[0016] Furthermore, protective covers are provided on both sides of the lower end of the fixed furnace body, and heating elements are installed on the protective covers.

[0017] Furthermore, the rotating roller has fifteen sets of feeding plates, and each feeding plate is equipped with an arc-shaped scraper plate at its end. The scraper plate is set close to the inner wall of the furnace body, and the feeding plate and the scraper plate are arranged in a T-shape.

[0018] Furthermore, the rotating shafts on both sides of the rotating roller are installed correspondingly via bearing components; and the bearing components are also provided with mechanical seal assemblies.

[0019] Furthermore, the rotating roller is provided with a hollow chamber inside, and a heating element is installed in the hollow chamber; a rotating motor is installed on the rotating shaft on the left side of the rotating roller, while a conductive slip ring is provided on the rotating shaft on the right side. One side of the conductive slip ring is connected to the heating element, and the other side is connected to a power supply device.

[0020] Furthermore, both the rotating roller and the feeding plate are made of heat-conducting material.

[0021] Beneficial effects: This utility model has the following beneficial effects:

[0022] 1) This device is equipped with a waste heat recovery pipe, which injects the collected waste heat into the solid furnace for the calcination of iron oxide, which can effectively save energy. Then, in conjunction with other heating elements, the calcination effect can be effectively improved.

[0023] 2) In this device, the area between the fixed furnace body and the rotating roller is the calcination area, and the material feeding plate installed on the rotating roller can generate the material feeding function, so that iron oxide can be evenly placed in the calcination area, thereby improving the calcination effect.

[0024] 3) The feeding plate in this device has the function of driving the iron oxide to rotate in the calcination zone and can make the heat injected by the waste heat recovery pipe evenly diffused, so that the material and temperature are uniform.

[0025] 4) The end of the feeding plate in this device is also equipped with a scraper plate, which can smoothly drive the iron oxide to rotate in the calcination area, improve the rotation process of the iron oxide, and improve the calcination effect.

[0026] 5) This device not only has heating elements installed at the lower end of the fixed furnace body, but also has a hollow chamber inside the rotating roller, where heating elements are installed to improve the temperature and calcination effect;

[0027] 6) In this device, a conductive slip ring is installed on the rotating shaft on one side of the rotating roller. The conductive slip ring enables rotational electrical connection, which enables the power supply connection of the internal heating element when the rotating roller is rotating, thereby achieving heating. The structure is reasonable. Attached Figure Description

[0028] Figure 1 This is a structural diagram of Embodiment 1 of the present utility model;

[0029] Figure 2 for Figure 1 AA view;

[0030] Figure 3This is a diagram showing the locations of the inlet and outlet in Example 1;

[0031] Figure 4 This is a diagram showing the location of the shovel plate in Example 1;

[0032] Figure 5 This is a structural diagram of Embodiment 2 of the present utility model;

[0033] Figure 6 for Figure 5 BB view;

[0034] The components include: a fixed furnace body 1; a rotating roller 2; a calcination zone 3; a rotating shaft 4; a rotating motor 5; a feeding plate 6; a waste heat recovery pipe 7; a hinge assembly 8; a feed inlet 9; a feed gate plate 10; a discharge outlet 11; a discharge gate plate 12; a protective cover 13; a heating element 14; a scraper plate 15; a bearing component 16; a hollow chamber 17; a conductive slip ring 18; and a power supply device 19. Detailed Implementation

[0035] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. These embodiments are implemented under the premise of the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0036] Example 1

[0037] like Figure 1 As shown, an iron oxide calcining furnace based on oxygen waste heat recovery in this embodiment includes a horizontally arranged fixed furnace body 1. In this embodiment, a rotating roller 2 is arranged inside the fixed furnace body 1. A calcination area 3 is left between the rotating roller 2 and the inner wall of the fixed furnace body 1. Rotating shafts 4 are arranged on both sides of the rotating roller 2. The rotating shafts 4 extend from the fixed furnace body 1, and a rotating motor 5 is installed on the left rotating shaft 4.

[0038] In this embodiment, a plurality of material-pushing plates 6 are also installed on the rotating roller 2. The material-pushing plates 6 are evenly spaced and arranged in a divergent manner. The material-pushing plates 6 extend into the calcination zone 3. In this embodiment, the width of the material-pushing plates 6 is the same as the width of the rotating roller 2, and the length of the material-pushing plates 6 is set accordingly so that the material-pushing plates 6 extend to the inner wall of the fixed furnace body 1. When the rotating roller 2 rotates, it drives the material-pushing plates 6 to rotate in the calcination zone 3.

[0039] like Figure 2 As shown, the solid furnace body of this embodiment is also equipped with a waste heat recovery pipe 7. The waste heat recovery pipe 7 injects the recovered heat into the calcination zone 3 inside the fixed furnace body 1. When the internal rotating roller 2 rotates, the heat is diffused to the entire calcination zone 3 through the material feeding plate 6.

[0040] In this embodiment, the waste heat recovery pipes 7 are all installed in the upper half of the fixed furnace body 1.

[0041] In this embodiment, three sets of waste heat recovery pipes 7 are provided. One set is located at the top of the fixed furnace body 1, and the other two sets are symmetrically located on both sides of the top of the fixed furnace body 1. All three sets of waste heat recovery pipes 7 can inject the recovered hot gas into the fixed furnace body 1.

[0042] like Figure 3 As shown, in this embodiment, the upper end of the fixed furnace body 1 is equipped with a feed inlet 9 and a feed door plate 10 through a hinge assembly 8, and the lower end of the fixed furnace body 1 is equipped with a discharge outlet 11 and a discharge door plate 12 through a hinge assembly 8.

[0043] In this embodiment, protective covers 13 are also provided on both sides of the lower end of the fixed furnace body 1. Heating elements 14 are installed on the protective covers 13.

[0044] like Figure 4 As shown, in this embodiment, there are fifteen sets of material feeding plates 6 on the rotating roller 2, and each material feeding plate 6 is also equipped with an arc-shaped material scraper 15 at its end. The material scraper 15 is set close to the inner wall of the fixed furnace body 1, and the material feeding plate 6 and the material scraper 15 are arranged in a T-shape.

[0045] In this embodiment, the rotating shafts 4 on both sides of the rotating roller 2 are installed correspondingly via bearing components 16; and the bearing components 16 in this embodiment are also provided with mechanical seal components.

[0046] The specific working principle of the technical solution in this embodiment is as follows: When using the technical solution in this embodiment, the feeding gate plate at the top of the fixed furnace body needs to be opened first, and then the rotary motor is turned on to drive the rotary roller to rotate in the solid furnace body. While the rotary roller is rotating, the feed is fed. Then, the iron oxide is put into the fixed furnace body from the feed port. Since the rotary roller is rotating, the iron oxide enters the calcination area evenly, and the iron oxide is located in the area separated by the feeding plate.

[0047] When the rotating roller rotates, the waste heat recovery pipe in the upper part of the fixed furnace body injects hot air into the calcination area accordingly, and as the material feeding plate rotates, the hot air is gradually and evenly diffused throughout the entire calcination area. In this embodiment, the setting of the material feeding plate is very important. The width of the material feeding plate is the same as that of the rotating roller, while the length is set to extend to the inner wall of the fixed furnace body. That is, the iron oxide will be driven to rotate in the calcination area by the material feeding plate, thereby achieving the purpose of accelerating calcination.

[0048] Iron oxide is present in the area formed by each pair of feeding plates, achieving the purpose of zonal and uniform calcination. Furthermore, the rotation of the feeding plates causes the iron oxide to rotate, resulting in a uniform distribution of iron oxide. The heat injected by the waste heat recovery pipe is also very uniform, and energy can be saved to a great extent.

[0049] In addition, in order to increase the temperature inside the overall fixed furnace body, a protective cover is installed at the lower end of the fixed furnace body in this embodiment. A heating element is installed inside the protective cover. The heating element can effectively increase the temperature of the fixed furnace body and improve the calcination effect.

[0050] Furthermore, in this embodiment, an arc-shaped scraper plate is provided at the end of each feeding plate. The scraper plate is set close to the inner wall of the fixed furnace body. The scraper plate can scrape the material to prevent iron oxide from leaking out from the gaps, and ensure that the iron oxide in the feeding plate area can rotate together. The structure is reasonably designed.

[0051] Example 2

[0052] like Figure 5 and Figure 6 As shown, an iron oxide calcining furnace based on oxygen waste heat recovery in this embodiment includes a horizontally arranged fixed furnace body 1. In this embodiment, a rotating roller 2 is arranged inside the fixed furnace body 1. A calcination area 3 is left between the rotating roller 2 and the inner wall of the fixed furnace body 1. Rotating shafts 4 are arranged on both sides of the rotating roller 2. The rotating shafts 4 extend from the fixed furnace body 1, and a rotating motor 5 is installed on the left rotating shaft 4.

[0053] In this embodiment, a plurality of material-pushing plates 6 are also installed on the rotating roller 2. The material-pushing plates 6 are evenly spaced and arranged in a divergent manner. The material-pushing plates 6 extend into the calcination zone 3. In this embodiment, the width of the material-pushing plates 6 is the same as the width of the rotating roller 2, and the length of the material-pushing plates 6 is set accordingly so that the material-pushing plates 6 extend to the inner wall of the fixed furnace body 1. When the rotating roller 2 rotates, it drives the material-pushing plates 6 to rotate in the calcination zone 3.

[0054] Furthermore, the solid furnace body of this embodiment is also equipped with a waste heat recovery pipe 7, which injects the recovered heat into the calcination zone 3 inside the fixed furnace body 1, and when the internal rotating roller 2 rotates, the heat is diffused to the entire calcination zone 3 through the material feeding plate 6.

[0055] In this embodiment, the waste heat recovery pipes 7 are all installed in the upper half of the fixed furnace body 1.

[0056] In this embodiment, three sets of waste heat recovery pipes 7 are provided. One set is located at the top of the fixed furnace body 1, and the other two sets are symmetrically located on both sides of the top of the fixed furnace body 1. All three sets of waste heat recovery pipes 7 can inject the recovered hot gas into the fixed furnace body 1.

[0057] In this embodiment, the upper end of the fixed furnace body 1 is equipped with a feed inlet 9 and a feed door plate 10 via a hinge assembly 8, and the lower end of the fixed furnace body 1 is equipped with a discharge outlet 11 and a discharge door plate 12 via a hinge assembly 8.

[0058] In this embodiment, protective covers 13 are also provided on both sides of the lower end of the fixed furnace body 1. Heating elements 14 are installed on the protective covers 13.

[0059] In this embodiment, the rotating roller 2 has fifteen sets of feeding plates 6, and each feeding plate 6 has an arc-shaped scraper plate 15 installed at its end. The scraper plate 15 is set close to the inner wall of the fixed furnace body 1, and the feeding plate 6 and the scraper plate 15 are arranged in a T-shape.

[0060] In this embodiment, the rotating shafts 4 on both sides of the rotating roller 2 are installed correspondingly via bearing components 16; and the bearing components 16 in this embodiment are also provided with mechanical seal components.

[0061] In this embodiment, the rotating roller 2 is also provided with a hollow chamber 17, and a heating element 14 is installed in the hollow chamber 17; a rotating motor 5 is installed on the rotating shaft 4 on the left side of the rotating roller 2, and a conductive slip ring 18 is correspondingly provided on the rotating shaft 4 on the right side. One side of the conductive slip ring 18 is connected to the heating element 14, and the other side is connected to a power supply device 19; the rotating roller 2 and the feeding plate 6 in this embodiment are both made of heat-conducting material.

[0062] The technical solution of this embodiment is based on the technical solution of embodiment 1. A hollow chamber is set inside the rotating roller, and a heating element is installed in the hollow chamber. The iron oxide to be calcined is heated and calcined from the inside. Since the heating is performed from the middle position of the rotating roller, the heat can be evenly diffused from the inside to the outside to every corner, the temperature diffusion is more uniform, and the calcination effect is better.

[0063] In this embodiment, a rotating motor is installed on the rotating shaft at one end of the rotating roller, so it can rotate accordingly. A conductive slip ring is installed on the rotating shaft on the other side. The conductive slip ring is a rotating device that can realize power transmission or signal transmission. It can realize power transmission to the heating element in the hollow chamber when the rotating shaft is rotating, thus realizing power transmission during rotation. Since this device is existing technology, this embodiment does not describe its structural features in detail.

[0064] Under the action of the conductive slip ring, the rotating roller rotates accordingly while the internal heating element continuously heats and generates heat, which is then dissipated to calcine the iron oxide in the calcination area. The structure is reasonably designed.

[0065] The above-described specific embodiments are merely preferred embodiments of this utility model and are not intended to limit the implementation of this utility model or the scope of the claims. All equivalent changes and modifications made in accordance with the scope of protection of this utility model patent application should be included within the scope of this utility model patent application.

Claims

1. An iron oxide calcining furnace based on oxygen waste heat recovery, characterized in that: The furnace includes a horizontally arranged fixed furnace body (1), inside which a rotating roller (2) is provided. A calcination area (3) is left between the rotating roller (2) and the inner wall of the fixed furnace body (1). Rotating shafts (4) are provided on both sides of the rotating roller (2). The rotating shafts (4) extend from the fixed furnace body (1), and a rotating motor (5) is installed on the left rotating shaft (4). The rotating roller (2) is also equipped with several material-pushing plates (6). The material-pushing plates (6) are evenly spaced and arranged in a divergent manner. The material-pushing plates (6) extend into the calcination zone (3). The width of the material-pushing plates (6) is the same as the width of the rotating roller (2), and the length of the material-pushing plates (6) is set accordingly so that the material-pushing plates (6) extend to the inner wall of the fixed furnace body (1). When the rotating roller (2) rotates, it drives the material-pushing plates (6) to rotate in the calcination zone (3). Furthermore, a waste heat recovery pipe (7) is installed on the solid furnace body. The waste heat recovery pipe (7) injects the recovered heat into the calcination zone (3) inside the fixed furnace body (1). When the internal rotating roller (2) rotates, the heat is diffused to the entire calcination zone (3) through the material feeding plate (6).

2. The iron oxide calcining furnace based on oxygen waste heat recovery according to claim 1, characterized in that: The waste heat recovery pipes (7) are all installed in the upper half of the fixed furnace body (1).

3. The iron oxide calcining furnace based on oxygen waste heat recovery according to claim 2, characterized in that: The waste heat recovery pipe (7) is provided in three sets. One set is located at the top of the fixed furnace body (1), and the other two sets are symmetrically located on both sides of the top of the fixed furnace body (1). All three sets of waste heat recovery pipes (7) can inject the recovered hot gas into the fixed furnace body (1).

4. The iron oxide calcining furnace based on oxygen waste heat recovery according to claim 1, characterized in that: The upper end of the fixed furnace body (1) is equipped with a feed inlet (9) and a feed door plate (10) via a hinge assembly (8), and the lower end of the fixed furnace body (1) is equipped with a discharge outlet (11) and a discharge door plate (12) via a hinge assembly (8).

5. The iron oxide calcining furnace based on oxygen waste heat recovery according to claim 1, characterized in that: The lower ends of the fixed furnace body (1) are also provided with protective covers (13), and heating elements (14) are installed on the protective covers (13).

6. The iron oxide calcining furnace based on oxygen waste heat recovery according to claim 1, characterized in that: The rotating roller (2) has fifteen sets of feeding plates (6), and each feeding plate (6) is also equipped with an arc-shaped scraper plate (15) at its end. The scraper plate (15) is set close to the inner wall of the fixed furnace body (1), and the feeding plate (6) and the scraper plate (15) are arranged in a T-shape.

7. The iron oxide calcining furnace based on oxygen waste heat recovery according to claim 1, characterized in that: The rotating shafts (4) on both sides of the rotating roller (2) are installed correspondingly via bearing components (16); and the bearing components (16) are also provided with mechanical seal components.

8. The iron oxide calcining furnace based on oxygen waste heat recovery according to claim 7, characterized in that: The rotating roller (2) is also provided with a hollow chamber (17), and a heating element (14) is installed in the hollow chamber (17); a rotating motor (5) is installed on the rotating shaft (4) on the left side of the rotating roller (2), and a conductive slip ring (18) is corresponding to the rotating shaft (4) on the right side. One side of the conductive slip ring (18) is connected to the heating element (14), and the other side is connected to a power supply device (19).

9. The iron oxide calcining furnace based on oxygen waste heat recovery according to claim 8, characterized in that: The rotating roller (2) and the feeding plate (6) are both made of heat-conducting material.

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