Pressure regulating valve group of sintering machine

Abstract

The utility model relates to sintering machine technical field, specifically is a kind of sintering machine pressure regulating valve group. Expansion joint includes the bellows section of upper side and the fixed pipe section of lower side, fixed pipe section is made of 20mm thick steel plate, elbow lower end passes through bellows section and extends into fixed pipe section, bellows section upper end is fixed with elbow outer wall, valve group body, elbow and fixed pipe section inner wall are sequentially stacked with heat-insulating cotton layer and refractory brick layer from inside to outside, the joint of refractory brick layer is filled with refractory cement, the end in valve group body is equipped with the valve plate elbow lower end sequentially passing through bellows section and extending into fixed pipe section, while in valve group body, elbow and fixed pipe section inner wall setting composite refractory heat-insulating layer by heat-insulating cotton layer and refractory brick layer are constituted, and in brick joint filling refractory cement, effectively improve the durability and sealing performance of valve group overall structure under high temperature, high wear condition.

Description

Technical Field

[0001] This utility model relates to the field of sintering machine technology, specifically a pressure regulating valve group for a sintering machine. Background Technology

[0002] The sintering machine is a key piece of equipment in the iron and steel smelting process, and its operational stability directly affects the output and quality of sintered ore. During sintering production, the high negative pressure environment created by the main exhaust system causes high-temperature exhaust gas to carry a large amount of sintered ore dust particles at high speed through the air box and subsequent pipeline components. These components are subjected to harsh conditions of high temperature, corrosion, and erosion over a long period of time. Among them, the pressure regulating valve group, as a key device for controlling air pressure and flow, has a significant impact on the energy efficiency and operating rate of the entire system due to its service life and sealing performance.

[0003] Currently, the valve assembly structures commonly used in this field typically include components such as valve boxes, elbows, and expansion joints. In actual operation, high-temperature, dust-laden airflow continuously impacts the inner wall of the valve assembly, especially at points where the airflow direction changes or the channel cross-section changes, where the erosion and wear of the material on the wall surface is particularly severe. Common failure modes include local wear through the expansion joint, thinning and leakage at the elbow, and damage to the valve box lining, leading to increased system air leakage and increased fan load, which not only increases energy consumption but also frequently causes production interruptions. In addition, the anti-wear and heat insulation measures in existing structures often fail to balance long-term durability and ease of maintenance, resulting in long component replacement and repair cycles, which adversely affects the continuous production rhythm. Furthermore, in traditional pressure regulating valve assemblies, the valve plate is usually located in the upper or upper-middle part of the valve body. When the valve opening is required to be extremely small in the micro-negative pressure ignition process, insufficient opening can easily lead to material accumulation and blockage of the valve port, making it difficult to stably maintain the required micro-negative pressure environment, affecting ignition quality, and also exacerbating valve plate wear and equipment vibration. Utility Model Content

[0004] This invention aims to solve the above problems, thereby providing a sintering machine pressure regulating valve assembly with improved service life. The technical solution adopted by this utility model to solve the aforementioned problem is: A pressure regulating valve assembly for a sintering machine includes a valve assembly body connected to the sintering machine air box. The lower end of the valve assembly body is connected to an elbow. An expansion joint connected to a settling pipe is provided below the elbow. The expansion joint includes an upper corrugated pipe section and a lower fixed pipe section. The lower end of the elbow passes through the corrugated pipe section and extends into the fixed pipe section. The upper end of the corrugated pipe section is fixed to the outer wall of the elbow. A thermal insulation cotton layer and a refractory brick layer are stacked sequentially from the inside to the outside on the inner walls of the valve assembly body, the elbow, and the fixed pipe section. The joints of the refractory brick layers are filled with refractory cement. An adjustable valve plate is provided at the end of the valve assembly body.

[0005] Compared with the prior art, the outstanding features of this utility model, which adopts the above technical solution, are: By placing the valve plate at the end of the valve assembly body, materials flow more easily under gravity, reducing the material accumulation and blockage problems caused by small openings when the valve plate is located in the upper middle part of the traditional structure. This is particularly beneficial for achieving the stable operating conditions required for micro-negative pressure ignition, improving ignition quality and operational reliability. By setting an expansion joint structure that includes a corrugated pipe section and a fixed pipe section, and having the lower end of the elbow pass through the corrugated pipe section and extend into the fixed pipe section in sequence, and by setting a composite refractory insulation layer consisting of a thermal insulation cotton layer and a refractory brick layer on the inner wall of the valve assembly body, elbow, and fixed pipe section, and filling the brick joints with refractory cement, the overall durability and sealing performance of the valve assembly structure under high temperature and high wear conditions are effectively improved. This helps reduce the risk of system air leakage caused by lining wear and extends the maintenance cycle. The adjustable valve plate opening design enhances the flexibility of airflow control. Combined with its low-position arrangement, the valve can remain unobstructed even with a small opening, further optimizing the accuracy and stability of negative pressure control.

[0006] As a preferred embodiment, a further technical solution of this utility model is: Furthermore, the upper end of the corrugated pipe section is provided with an upper flange, and the bottom end of the fixed pipe section is provided with a lower flange. The corrugated pipe section is welded and fixed to the elbow through the upper flange, and the fixed pipe section is connected to the settlement pipe through the lower flange. The flange connection method enhances the structural stability and sealing between the pipe sections, facilitates installation, disassembly and maintenance, and helps to ensure the connection reliability of the system under high temperature and high pressure conditions.

[0007] Furthermore, the minimum expansion of the corrugated pipe section is 150mm, and the lower flange and the lower end of the elbow are kept at a distance of 120-130mm as the tensile displacement, which provides sufficient compensation for the thermal expansion and contraction of the system. This helps to absorb the changes in pipe length caused by temperature changes, reduce the damage of thermal stress to the overall structure, and improve the adaptability of the equipment in long-term high-temperature operation.

[0008] Furthermore, the valve plate is made of stainless steel, which has excellent high temperature resistance and corrosion resistance, enabling it to maintain a long service life in dusty, high-speed airflow environments. It also helps maintain the structural integrity of the valve plate and the stability of its regulating function.

[0009] Furthermore, the refractory brick layer uses ceramic tiles made of alumina. Alumina has high wear resistance and refractoriness, which can effectively resist the continuous scouring of sintered ore dust and the chemical erosion of high-temperature airflow, thus improving the overall durability of the inner lining.

[0010] Furthermore, the insulation layer uses aluminum silicate rock wool, which has good thermal insulation properties and flexibility. It can reduce heat loss and lower the temperature of the outer wall, as well as buffer some of the material impact, providing support and protection for the refractory brick layer.

[0011] Furthermore, the refractory cement is aluminate refractory cement. Aluminate refractory cement can still maintain good bonding strength and stability at high temperatures. When used to fill brick joints, it can enhance the overall sealing and structural integrity of the lining and prevent airflow penetration that could lead to insulation layer failure.

[0012] Furthermore, the insulation cotton layer and the refractory brick layer are fixed to the inner wall of the valve body, elbow and fixed pipe section by bolts. The bolt fixing method facilitates the installation and later replacement of the inner lining layer, and at the same time ensures that it remains firmly attached under the impact of high-speed airflow, avoiding the lining from falling off due to vibration or erosion.

[0013] Furthermore, a set of bearing seats is provided on both sides of the inner cavity of the valve assembly body, and a rotating shaft is provided between the bearing seats. The valve plate is fixed on the rotating shaft, and one end of the rotating shaft extends out of the valve assembly body and is connected to a drive mechanism. This enhances the stability and accuracy of the valve plate opening control, which is beneficial to maintaining the smooth movement of the regulating components under high temperature and dusty airflow conditions, reducing the risk of control failure due to jamming or wear, and also has a positive significance for extending the service life of the regulating mechanism.

[0014] Furthermore, the elbow is composed of a section of obliquely joined rectangular tube and a section of straight rectangular tube welded together. The axis of the obliquely joined rectangular tube forms a 45° angle with the axis of the straight rectangular tube. This structure is conducive to achieving a smooth transition of airflow direction, reducing local eddies and scouring, reducing the risk of wear at the elbow, and maintaining the smoothness and strength of the overall structure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present utility model; Figure 2 This is a schematic cross-sectional view of the valve assembly body according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the main cross-sectional structure of an embodiment of the present utility model; The components in the diagram are labeled as follows: 1. Valve assembly body; 2. Elbow; 3. Expansion joint; 4. Valve plate; 5. Insulation cotton layer; 6. Refractory brick layer; 7. Corrugated pipe section; 8. Fixed pipe section; 9. Rotary shaft. Detailed Implementation

[0016] The present invention will be further described below with reference to embodiments, the purpose of which is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0017] A pressure regulating valve assembly for a sintering machine includes a valve assembly body 1 connected to the sintering machine air box. The lower end of the valve assembly body 1 is connected to an elbow 2. Below the elbow 2, an expansion joint 3 connected to a settling pipe is provided. The expansion joint 3 includes an upper corrugated pipe section 7 and a lower fixed pipe section. The fixed pipe section is composed of a 20mm thick steel plate. The lower end of the elbow 2 passes through the corrugated pipe section 7 and extends into the fixed pipe section. The upper end of the corrugated pipe section 7 is fixed to the outer wall of the elbow 2. The inner walls of the valve assembly body 1, the elbow 2, and the fixed pipe section are sequentially stacked from the inside to the outside with a thermal insulation cotton layer 5 and a refractory brick layer 6. The joints of the refractory brick layer 6 are filled with refractory cement. The valve plate 4 with adjustable opening is provided at the end of the valve assembly body 1.

[0018] Furthermore, the upper end of the corrugated pipe section 7 is provided with an upper flange, and the bottom end of the fixed pipe section is provided with a lower flange. The corrugated pipe section 7 is welded and fixed to the elbow 2 through the upper flange, and the fixed pipe section is connected to the settlement pipe through the lower flange. The flange connection method enhances the structural stability and sealing between the pipe sections, facilitates installation, disassembly and maintenance, and helps to ensure the connection reliability of the system under high temperature and high pressure conditions.

[0019] Furthermore, the minimum expansion of the corrugated pipe section 7 is 150mm, and the lower flange and the lower end of the elbow 2 maintain a distance of 120-130mm as the tensile displacement, which provides sufficient compensation for the thermal expansion and contraction of the system, helps to absorb the pipe length change caused by temperature change, reduces the damage of thermal stress to the overall structure, and improves the adaptability of the equipment in long-term high-temperature operation.

[0020] Furthermore, the valve plate 4 is made of stainless steel, which has good high temperature resistance and corrosion resistance, and can maintain a long service life in the environment of dusty high-speed airflow. At the same time, it helps to maintain the structural integrity of the valve plate 4 and the stability of the regulating function.

[0021] Furthermore, the refractory brick layer 6 is made of alumina ceramic tile. Alumina has high wear resistance and refractoriness, which can effectively resist the continuous scouring of sintered ore dust and the chemical erosion of high-temperature airflow, thus improving the overall durability of the inner lining layer.

[0022] Furthermore, the insulation layer 5 is made of aluminum silicate rock wool, which has good thermal insulation performance and flexibility. It can reduce heat loss and lower the temperature of the outer wall, and also buffer some of the material impact, providing support and protection for the refractory brick layer 6.

[0023] Furthermore, the refractory cement is aluminate refractory cement. Aluminate refractory cement can still maintain good bonding strength and stability at high temperatures. When used to fill brick joints, it can enhance the overall sealing and structural integrity of the lining and prevent airflow penetration that could lead to insulation layer failure.

[0024] Furthermore, the insulation cotton layer 5 and the refractory brick layer 6 are fixed to the inner wall of the valve body 1, the elbow 2 and the fixed pipe section by bolts. The bolt fixing method facilitates the installation and later replacement of the inner lining layer, and at the same time ensures that it remains firmly attached under the impact of high-speed airflow, avoiding the lining from falling off due to vibration or erosion.

[0025] Furthermore, a set of bearing seats is provided on both sides of the inner cavity end of the valve assembly body 1, and a rotating shaft 9 is provided between the bearing seats. The valve plate 4 is fixed on the rotating shaft 9. One end of the rotating shaft 9 extends out of the valve assembly body 1 and is connected to a drive mechanism, which is a drive motor. This enhances the stability and accuracy of the valve plate 4 opening control, which is beneficial to maintaining the smooth movement of the regulating components under high temperature and dusty airflow conditions, reducing the risk of control failure due to jamming or wear, and also has a positive significance for extending the service life of the regulating mechanism.

[0026] Furthermore, elbow 2 is composed of a section of oblique rectangular tube and a section of straight rectangular tube welded together. The axis of the oblique rectangular tube forms a 45° angle with the axis of the straight rectangular tube, and the straight rectangular tube is arranged longitudinally. This structure is conducive to achieving a smooth transition of airflow direction, reducing local eddies and scouring, reducing the risk of wear at elbow 2, and maintaining the smoothness and strength of the overall structure.

[0027] During operation, the high negative pressure generated by the main exhaust fan of the sintering machine causes high-temperature dusty flue gas to enter the valve body 1 from the sintering machine air box. Since the valve plate 4 is located at the end of the valve body 1, below which are the elbow 2 and expansion joint 3, the material flows easily under the action of gravity, reducing the problem of material accumulation and blockage caused by the extremely small valve opening required by the micro-negative pressure ignition process when the valve plate is located in the middle and upper part of the traditional structure. The airflow first impacts the valve plate 4, which is made of stainless steel, and its opening is precisely adjusted by the rotating shaft 9 driven by the drive motor to achieve stable control of air pressure and flow rate, ensuring the stability of the working conditions required for micro-negative pressure ignition (such as -7kPa). Subsequently, the airflow passes through the elbow 2, which is composed of a section of oblique rectangular tube and a section of straight rectangular tube welded together with the axis at a 45° angle, achieving a smooth transition in direction and significantly reducing local eddies and the scouring and wear of the material on the wall surface. During this process, the aluminum silicate rock wool insulation cotton, which is firmly fixed by bolts on the inner wall of the valve body 1, elbow 2, and fixed pipe section 8 and is stacked from the inside to the outside, is also present. Layer 5 and layer 6 are made of alumina refractory bricks, and the brick joints are filled with aluminate refractory cement to form a high-efficiency composite refractory insulation layer, which effectively resists the high-temperature corrosion and continuous scouring of dust-laden high-speed airflow. When the pipeline system undergoes thermal displacement due to temperature changes, the corrugated pipe section 7, which is welded and fixed to the elbow 2 by the upper flange, can deform. Its minimum expansion of 150mm and the 120-130mm tensile displacement distance between the lower flange and the lower end of the elbow 2 provide sufficient compensation for the thermal expansion and contraction of the system, effectively absorbing the changes in pipeline length, reducing the damage of thermal stress to the overall structure, and improving the reliability of the equipment during long-term high-temperature operation. Finally, the airflow enters the settling pipe through the expansion joint 3. Throughout the process, the structural design of this utility model effectively overcomes a series of shortcomings of traditional valve groups, such as system leakage, increased energy consumption, and frequent maintenance caused by lining wear, thermal stress damage, and valve port blockage. It comprehensively improves the durability, sealing, and operational stability of the pressure regulating valve group under high-temperature and high-abrasion conditions.

[0028] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A pressure regulating valve assembly for a sintering machine, comprising a valve assembly body connected to the sintering machine air box, an elbow connected to the lower end of the valve assembly body, and an expansion joint connected to a settling pipe below the elbow, characterized in that: The expansion joint includes an upper corrugated pipe section and a lower fixed pipe section. The lower end of the elbow passes through the corrugated pipe section and extends into the fixed pipe section. The upper end of the corrugated pipe section is fixed to the outer wall of the elbow. The inner walls of the valve assembly body, the elbow, and the fixed pipe section are layered with insulation cotton and refractory bricks from the inside to the outside. The joints of the refractory bricks are filled with refractory cement. An adjustable valve plate is provided at the end of the valve assembly body.

2. The sintering machine pressure regulating valve assembly according to claim 1, characterized in that: The corrugated pipe section is equipped with an upper flange at the upper end, and the fixed pipe section is equipped with a lower flange at the bottom end. The corrugated pipe section is welded and fixed to the elbow through the upper flange, and the fixed pipe section is connected to the settlement pipe through the lower flange.

3. The sintering machine pressure regulating valve assembly according to claim 2, characterized in that: The minimum expansion of the corrugated pipe section is 150mm, and the lower flange and the lower end of the elbow are kept at a distance of 120-130mm as the tensile displacement.

4. The sintering machine pressure regulating valve assembly according to claim 1, characterized in that: The valve plate is made of stainless steel.

5. The sintering machine pressure regulating valve assembly according to claim 1, characterized in that: The refractory brick layer is made of ceramic tiles with aluminum oxide material.

6. The sintering machine pressure regulating valve assembly according to claim 1, characterized in that: The insulation layer is made of aluminum silicate rock wool.

7. The sintering machine pressure regulating valve assembly according to claim 1, characterized in that: The refractory cement is aluminate refractory cement.

8. The sintering machine pressure regulating valve assembly according to claim 1, characterized in that: The insulation cotton layer and the refractory brick layer are fixed to the inner wall of the valve assembly body, elbows and fixed pipe sections by bolts.

9. The sintering machine pressure regulating valve assembly according to claim 1, characterized in that: A set of bearing seats is provided on both sides of the inner cavity of the valve assembly body. A rotating shaft is provided between the bearing seats. The valve plate is fixed on the rotating shaft. One end of the rotating shaft extends out of the valve assembly body and is connected to a drive mechanism.

10. The sintering machine pressure regulating valve assembly according to claim 1, characterized in that: The elbow is composed of a section of oblique rectangular tube and a section of straight rectangular tube welded together, with the axis of the oblique rectangular tube forming a 45° angle with the axis of the straight rectangular tube.

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