Circulating ventilation device for improving material melting stability of shaft kiln

Abstract

The utility model discloses a circulating ventilation device for improving the material melting stability of a shaft kiln, which comprises a shaft kiln body, a preheating zone, a calcining zone and a cooling zone are sequentially arranged in the shaft kiln body from top to bottom, and the bottom of the cooling zone is communicated with a ventilation pipeline through an air inlet. The upper end of the ventilation pipeline communicates with an air outlet in the top of the preheating zone, and one end of the right side of the ventilation pipeline is connected with a frequency conversion fan. The circulating ventilation system is arranged, hot air exhausted by the cooling belt is used for preheating cold air, heat recycling is achieved, the energy utilization efficiency is improved, energy consumption in the production process is reduced, the frequency conversion draught fan and the flow adjusting valve on the ventilation pipeline can accurately adjust the ventilation quantity and the air quantity of all the air spraying openings, and the production efficiency is improved. And the uniformity of ventilation in the kiln is ensured, so that materials can be uniformly heated in the calcining process, the stability of material melting is effectively improved, and the improvement of the product quality is facilitated.

Description

Technical Field

[0001] This utility model relates to the technical field of vertical kiln equipment, specifically a circulating ventilation device for improving the melting stability of materials in a vertical kiln. Background Technology

[0002] Vertical kilns, as important thermal equipment, are widely used in industries such as metallurgy and building materials. They are mainly used for calcining and other processing of materials. During the operation of a vertical kiln, the melting stability of the material directly affects the quality of the product and the production efficiency. Currently, the ventilation uniformity of traditional vertical kiln ventilation systems is poor, resulting in uneven heating of materials in different parts of the kiln, which in turn affects the melting effect of the material and the stability of product quality. On the other hand, the efficiency of heat recovery and utilization is low, resulting in energy waste and increased production costs. In addition, if the air entering the vertical kiln contains impurities, it may also contaminate the materials and affect product quality. Utility Model Content

[0003] The purpose of this invention is to provide a circulating ventilation device that improves the melting stability of materials in a vertical kiln, and has the advantages of circulating ventilation and high heat utilization rate.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a circulating ventilation device for improving the melting stability of materials in a vertical kiln, comprising a vertical kiln body, wherein the interior of the vertical kiln body consists of a preheating zone, a calcination zone, and a cooling zone from top to bottom. The bottom of the cooling zone is connected to a ventilation duct through an air inlet, and the upper end of the ventilation duct is connected to the air outlet at the top of the preheating zone. A variable frequency fan is connected to one end of the ventilation duct on the right side. An air preheater is fixedly installed below the variable frequency fan and on the surface of the ventilation duct. Multiple air nozzles are evenly arranged on the kiln wall of the calcination zone. One end of the ventilation duct is connected to the air nozzle through a branch pipe, and a flow regulating valve is installed on each branch pipe.

[0005] As a preferred embodiment, a filter box is installed below the cooling strip and on one end of the connected ventilation duct, and five filter screens are installed horizontally at equal intervals inside the filter box.

[0006] As a preferred embodiment, positioning brackets are fixedly installed on both the upper and lower sides of the inner cavity of the filter box. The positioning brackets have a sliding groove longitudinally opened inside, and a longitudinal sliding block is slidably installed inside the sliding groove. A movable card plate is fixedly installed at the inner end of the longitudinal sliding block, and the inner side of the movable card plate is connected to the end of the filter screen plate.

[0007] As a preferred embodiment, the air preheater adopts a finned tube heat exchanger, and the air nozzle is flat in shape.

[0008] As a preferred embodiment, both sides of the vertical kiln body are fixedly installed with additional positioning plates, and the external of the additional positioning plates are welded with support columns.

[0009] As a preferred embodiment, a bearing plate is additionally welded to the inner side of the support column, and the top of the bearing plate is in contact with the bottom of the filter box.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] 1. This utility model, by setting up a circulating ventilation system, uses the hot air discharged from the cooling belt to preheat the cold air, realizing the recovery and utilization of heat, improving energy utilization efficiency, and reducing energy consumption in the production process. The variable frequency fan and flow regulating valve on the ventilation duct can accurately adjust the ventilation volume and the air volume of each air nozzle, ensuring the uniformity of ventilation in the kiln, so that the material can be heated evenly during the calcination process, effectively improving the stability of material melting and helping to improve product quality.

[0012] 2. This utility model utilizes a longitudinal sliding block that slides within the sliding groove of the positioning seat, and a movable card plate connected to the end of the filter screen plate, making the installation and removal of the filter screen plate extremely convenient. Maintenance personnel can easily slide the filter screen plate in or out along the sliding groove without complicated tools or operations, greatly saving maintenance time and labor costs. This structure ensures that the filter screen plate is firmly fixed within the filter box, preventing shaking or displacement during air filtration, thus guaranteeing the stability of the filtration effect. Even under the impact of airflow generated during ventilation system operation, the filter screen plate can maintain a stable position, effectively filtering impurities in the air. The finned tube heat exchanger has a large heat exchange area, and the presence of fins greatly increases the contact area between the air and the heat exchange tubes, thereby improving heat exchange efficiency. It can more fully utilize the hot air discharged from the cooling belt to preheat the cold air entering the vertical kiln, effectively recovering heat, improving energy utilization, and reducing energy consumption. Attached Figure Description

[0013] Figure 1 This is a first-person perspective structural perspective view of the present invention;

[0014] Figure 2 This is a second-view perspective structural perspective view of the present invention;

[0015] Figure 3 This is a partial structural cross-sectional view of the present invention;

[0016] Figure 4 This is a cross-sectional view of the internal structure of the filter box of this utility model.

[0017] In the diagram: 1. Vertical kiln body; 2. Support column; 3. Preheating zone; 4. Calcination zone; 5. Cooling zone; 6. Ventilation duct; 7. Variable frequency fan; 8. Air preheater; 9. Branch duct; 10. Flow regulating valve; 11. Filter box; 12. Positioning bracket; 13. Longitudinal sliding block; 14. Moving plate; 15. Filter screen; 16. Air nozzle. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. Example 1:

[0020] Please see Figure 1 As shown, this utility model provides a circulating ventilation device for improving the melting stability of materials in a vertical kiln. It includes a vertical kiln body 1. The interior of the vertical kiln body 1 consists of a preheating zone 3, a calcining zone 4, and a cooling zone 5 from top to bottom. The bottom of the cooling zone 5 is connected to a ventilation duct 6 through an air inlet. The upper end of the ventilation duct 6 is connected to the air outlet at the top of the preheating zone 3. One end of the ventilation duct 6 is connected to a variable frequency fan 7. An air preheater 8 is fixedly installed below the variable frequency fan 7 and on the surface of the ventilation duct 6. Multiple air nozzles 16 are evenly arranged on the kiln wall of the calcining zone 4. One end of the ventilation duct 6 is connected to the air nozzle 16 through a branch pipe 9, and a flow regulating valve 10 is installed on each branch pipe 9.

[0021] This technical solution utilizes a circulating ventilation system to preheat cold air by using the hot air discharged from the cooling belt 5, thereby achieving heat recovery and utilization, improving energy efficiency, and reducing energy consumption during production. The variable frequency fan 7 and flow regulating valve 10 on the ventilation duct 6 can precisely adjust the ventilation volume and the air volume of each nozzle, ensuring the uniformity of ventilation in the kiln. This allows the material to be heated evenly during calcination, effectively improving the stability of material melting and contributing to improved product quality. Example 2:

[0022] Based on Embodiment 1, this utility model is as follows: Figure 4As shown, a filter box 11 is installed below the cooling strip 5 and at one end of the connected ventilation duct 6. Five filter screens 15 are installed horizontally at equal intervals inside the filter box 11.

[0023] Adopting such Figure 1 The technical solution shown features a multi-stage filtration structure formed by five filter screens 15, which can comprehensively and meticulously filter the air entering the ventilation system. Impurities of different particle sizes can be intercepted at different levels of the filter screen. For example, large dust particles and debris will be intercepted by the first-stage filter screen, while small dust particles will be further filtered in subsequent filter screens. In this way, the air entering the vertical kiln is extremely clean, which can prevent impurities from mixing into the materials and ensure the purity and quality of the materials. It is especially suitable for the calcination process of materials that are sensitive to impurities. The pure air can avoid problems such as uneven melting of materials and product defects caused by impurities.

[0024] Secondly, in the technical solution, positioning brackets 12 are fixedly installed on both the upper and lower sides of the inner cavity of the filter box 11. The positioning brackets 12 have a sliding groove in the interior, and a longitudinal sliding block 13 is slidably installed inside the sliding groove. A movable card plate 14 is fixedly installed at the inner end of the longitudinal sliding block 13. The inner side of the movable card plate 14 is connected to the end of the filter screen plate 15. The air preheater 8 adopts a finned tube heat exchanger, and the shape of the air nozzle 16 is flat.

[0025] Its adoption is as follows Figure 1The technical solution shown, through the sliding of the longitudinal sliding block 13 within the sliding groove of the positioning bracket 12 and the connection between the movable bracket 14 and the end of the filter plate 15, makes the installation and removal of the filter plate 15 very convenient. Maintenance personnel can easily slide the filter plate 15 in or out along the sliding groove without complicated tools or operations, greatly saving maintenance time and labor costs. This structure ensures that the filter plate 15 is firmly fixed within the filter box 11, preventing shaking or displacement during air filtration, thus guaranteeing the stability of the filtration effect. Even under the airflow impact generated during ventilation system operation, the filter plate 15 can still maintain a stable position, effectively filtering impurities in the air. The finned tube heat exchanger has a large heat exchange area, and the fins... The presence of the heat exchanger plate greatly increases the contact area between the air and the heat exchange tube, thereby improving the heat exchange efficiency. It can make fuller use of the hot air discharged from the cooling zone 5 to preheat the cold air entering the vertical kiln, effectively recovering heat, improving energy utilization, and reducing energy consumption. When air is injected into the kiln from the flat air nozzle 16 at a certain angle, it is easier to form a rotating airflow. The rotating airflow can enhance the turbulence of the gas in the kiln, promote the full mixing and heat exchange between the gas and the material, improve the calcination efficiency, and enable the material to melt more quickly and evenly. The airflow ejected from the flat air nozzle 16 is relatively gentle and has less impact on the material in the kiln. This can avoid the displacement or damage of the material caused by strong airflow impact, protect the original shape and structure of the material, and help ensure the quality of the product. Example 3:

[0026] This utility model is as follows Figures 1-4 As shown, both sides of the vertical kiln body 1 are fixedly installed with additional positioning plates, and the outside of the additional positioning plates is welded with support columns 2; a bearing plate is also welded to the inside of the support column 2, and the top of the bearing plate is in contact with the bottom of the filter box 11.

[0027] By adopting the above technical solution, the addition of the positioning plate and support column 2 provides additional support and fixation for the vertical kiln body 1. During operation, the vertical kiln will be affected by various factors such as high temperature, material gravity and airflow force generated by the ventilation system. These structures can effectively disperse and bear these external forces, prevent the vertical kiln body 1 from tilting, deforming or displacing, and ensure that the vertical kiln can operate safely and stably.

[0028] The working principle of this utility model is as follows: Outside air first enters the filter box 11 from below the cooling belt 5. The left rear end of the filter box 11 is connected to the outside via an external fan. When the air passes through the filter box 11, large particles are first intercepted by the first-layer filter screen 15. As the air continues to flow, smaller particles are filtered by subsequent filter screens 15. The filtered clean air enters the ventilation duct 6. In the ventilation duct 6, the air passes through the finned tube air preheater located below the variable frequency fan 7. The hot air discharged from the cooling belt 5 circulates within the ventilation duct 6. When the cold air passes through the air preheater 8, due to the large heat exchange area of ​​the finned tube heat exchanger, the cold air exchanges heat with the hot air, absorbing the heat from the hot air and increasing its temperature. Thus, the air entering the vertical kiln is preheated. The variable frequency fan 7 provides power to the entire ventilation system, causing the air to circulate within the ventilation duct 6. According to the actual production needs inside the vertical kiln, the ventilation volume can be flexibly controlled by adjusting the speed of the variable frequency fan 7. The preheated air with its flow rate precisely controlled is injected tangentially into the calcining zone 4 from the flat air nozzle 16. The flat air nozzle 16 is designed so that the air can be injected into the kiln in a specific way, forming a rotating airflow, so that the air and the material can be fully contacted and the material can be heated evenly. After participating in heat exchange in the calcining zone 4, part of the air will flow downward to the cooling zone 5 with heat. Inside the cooling zone 5, the hot air exchanges heat with the material entering from the top of the vertical kiln, which initially cools the material and reduces its own temperature. The cooled air re-enters the ventilation duct 6 through the air inlet at the bottom of the cooling zone 5, is heated again by the air preheater 8, and then is injected into the calcining zone 4 through the air nozzle 16 to form a circulating airflow and realize the recovery and utilization of heat.

[0029] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0030] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A circulating ventilation device for improving the melting stability of materials in a vertical kiln, comprising a vertical kiln body (1), characterized in that: The interior of the vertical kiln body (1) consists of a preheating zone (3), a calcination zone (4), and a cooling zone (5) from top to bottom. The bottom of the cooling zone (5) is connected to a ventilation duct (6) through an air inlet. The upper end of the ventilation duct (6) is connected to the air outlet at the top of the preheating zone (3). A variable frequency fan (7) is connected to one end of the ventilation duct (6). An air preheater (8) is fixedly installed below the variable frequency fan (7) and on the surface of the ventilation duct (6). Multiple air nozzles (16) are evenly arranged on the kiln wall of the calcination zone (4). One end of the ventilation duct (6) is connected to the air nozzle (16) through a branch pipe (9), and a flow regulating valve (10) is installed on each branch pipe (9).

2. The circulating ventilation device for improving the melting stability of materials in a vertical kiln according to claim 1, characterized in that: A filter box (11) is installed below the cooling strip (5) and at one end of the connected ventilation duct (6). Five filter screens (15) are installed horizontally at equal intervals inside the filter box (11).

3. A circulating ventilation device for improving the melting stability of materials in a vertical kiln according to claim 2, characterized in that: Positioning brackets (12) are fixedly installed on both the upper and lower sides of the inner cavity of the filter box (11). The positioning brackets (12) have a sliding groove in the interior, and a longitudinal sliding block (13) is slidably installed inside the sliding groove. A movable plate (14) is fixedly installed at the inner end of the longitudinal sliding block (13), and the inner side of the movable plate (14) is connected to the end of the filter screen plate (15).

4. The circulating ventilation device for improving the melting stability of materials in a vertical kiln according to claim 1, characterized in that: The air preheater (8) adopts a finned tube heat exchanger, and the air nozzle (16) is flat in shape.

5. A circulating ventilation device for improving the melting stability of materials in a vertical kiln according to claim 1, characterized in that: Both sides of the vertical kiln body (1) are fixedly installed with additional positioning plates, and the outside of the additional positioning plates is welded with support columns (2).

6. A circulating ventilation device for improving the melting stability of materials in a vertical kiln according to claim 5, characterized in that: The inner side of the support column (2) is additionally welded with a bearing plate, and the top of the bearing plate is in contact with the bottom of the filter box (11).

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