Anti-wear structure of rotary kiln tertiary air valve

Abstract

The present disclosure relates to a rotary kiln tertiary air valve anti-abrasion structure, comprising a tertiary air valve and a flow guide installed at the inlet end of the tertiary air pipe, wherein the tertiary air valve comprises a shutter, the shutter comprises opposite first and second sides, the first side is located upstream of the tertiary air flow direction relative to the second side, and at least the first side is provided with the flow guide, the flow guide comprises a flow guide hole for guiding the tertiary air to uniformly pass through the shutter area to reduce the local rotational flow formed by the tertiary air around the shutter. Through the above technical solution, the rotary kiln tertiary air valve anti-abrasion structure can reduce the local rotational flow formed by the tertiary air around the shutter, thereby reducing the impact and grinding of high-temperature dust materials on the surface of the shutter and the surrounding refractory material, and is beneficial to ensuring the sealing performance of the shutter.

Description

Technical Field

[0001] This disclosure relates to the field of cement production equipment technology, specifically to an anti-wear structure for a rotary kiln tertiary air valve. Background Technology

[0002] The rotary kiln tertiary air valve is a key piece of equipment in cement production lines used to regulate the air volume of the tertiary air duct. It controls the air volume distribution between the rotary kiln and the tertiary air duct by changing the valve opening.

[0003] During normal operation of the rotary kiln, the tertiary air carries high-temperature (usually 800℃-1200℃) flue gas and some dust materials through the tertiary air valve gate area. Currently, when the tertiary air passes through the gate, it forms a disordered vortex, causing the high-temperature dust materials to continuously impact and grind the gate and the surrounding refractory lining. This causes the gate to quickly develop pits and deformation, and the refractory lining to peel off and crack. This directly leads to a decrease in the sealing performance of the gate and a reduction in the accuracy of the tertiary air volume regulation, which in turn affects the stability of the calcination conditions inside the kiln. Utility Model Content

[0004] The purpose of this disclosure is to provide an anti-wear structure for a rotary kiln tertiary air valve. This anti-wear structure can reduce the local swirling flow of tertiary air around the gate, thereby reducing the impact and abrasion of high-temperature dust materials on the gate surface and surrounding refractory materials, which is beneficial to ensuring the sealing performance of the gate.

[0005] To achieve the above objectives, this disclosure provides a wear-resistant structure for a rotary kiln tertiary air valve, comprising a tertiary air valve and a flow guide installed at the inlet end of the tertiary air duct. The tertiary air valve includes a gate, which has a first side and a second side opposite to each other. The first side is located upstream of the tertiary air flow direction relative to the second side, and the flow guide is provided on at least the first side. The flow guide includes a flow guide hole, which is used to guide the tertiary air to pass evenly through the gate area, thereby reducing the local swirling flow formed by the tertiary air around the gate.

[0006] Optionally, the flow guide is provided on both the first side and the second side.

[0007] Optionally, the flow guide is constructed as an arched structure, including an outer periphery and an inner periphery. A cavity is formed between the outer periphery and the refractory lining of the tertiary air duct, and the cavity is used for pouring concrete. The inner periphery forms the flow guide hole.

[0008] Optionally, the diameter of the guide hole is 1380mm to 1420mm; the length of each guide element in the axial direction is 550mm to 650mm.

[0009] Optionally, the guide component is constructed using kiln bricks and includes top hanging bricks and side wall kiln bricks disposed on both sides of the top hanging bricks. The top hanging bricks are manufactured using a prefabricated hanging brick extension process.

[0010] Optionally, the side wall bricks and the top hanging bricks are fixedly connected by interlocking masonry or a special high-temperature resistant adhesive.

[0011] Optionally, the thickness of the guide element in the radial direction gradually decreases from top to bottom.

[0012] Optionally, the anti-wear structure of the rotary kiln tertiary air valve also includes an opening degree marking component disposed on the outside of the tertiary air valve. The opening degree marking component includes a dial and a pointer. The dial is marked with an opening degree range scale adapted to the kiln condition. The pointer is linked with the drive mechanism of the gate to indicate the current opening degree of the gate in real time.

[0013] Through the above technical solution, in the anti-wear structure of the rotary kiln tertiary air valve disclosed herein, the first side is located upstream of the tertiary air flow direction relative to the second side, and at least the first side is provided with a guide component, which includes a guide hole. The guide component pre-guides the upstream tertiary air through the guide hole, so that the high-temperature flue gas and dust will form a uniform airflow along the guide hole before entering the gate area, avoiding local swirling due to abrupt changes in the flow channel cross section, thereby reducing the impact force of the tertiary air on the gate surface and reducing the abrasion intensity of the surrounding refractory lining material. This effectively avoids the rapid pitting and deformation of the gate, as well as the peeling and cracking of the refractory material, extending the service life of the gate, and thus helping to ensure the sealing performance and airflow regulation accuracy of the gate, and ensuring the calcination stability inside the kiln.

[0014] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the anti-wear structure of the rotary kiln tertiary air valve provided in the embodiments of this disclosure; Figure 2 This is another schematic diagram of the anti-wear structure of the rotary kiln tertiary air valve provided in this embodiment; Figure 3 This is a schematic diagram of the installation of the opening marking component and the drive mechanism of the anti-wear structure of the rotary kiln tertiary air valve provided in this embodiment.

[0016] Explanation of reference numerals in the attached drawings: 1. Tertiary air duct; 10. Cavity; 11. Inner refractory lining; 2. Tertiary air valve; 21. Gate; 211. First side; 212. Second side; 3. Flow guide; 30. Flow guide hole; 31. Outer perimeter; 32. Inner perimeter; 33. Top hanging brick; 34. Side wall kiln brick; 4. Dial; 41. Pointer; 5. Drive mechanism; 6. Decomposition furnace. Detailed Implementation

[0017] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0018] In this disclosure, unless otherwise stated, directional terms such as "up" and "down" generally refer to the relative "up" and "down" of the corresponding components in the direction of gravity when they are in use. Reference may also be made to... Figure 2 The direction indicated by the symbols. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not imply order or importance. In the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0019] According to exemplary embodiments of this disclosure, reference is made to Figure 1 and Figure 2 As shown, a wear-resistant structure for a rotary kiln tertiary air valve is provided, including a tertiary air valve 2 and a flow guide 3 installed at the inlet end of the tertiary air duct 1. The tertiary air valve 2 includes a gate plate 21, which includes a first side 211 and a second side 212 opposite to each other. The first side 211 is located upstream of the tertiary air flow direction relative to the second side 212, and at least the first side 211 is provided with a flow guide 3. The flow guide 3 includes a flow guide hole 30, which is used to guide the tertiary air to pass evenly through the area of ​​the gate plate 21, so as to reduce the local swirling flow formed by the tertiary air around the gate plate 21.

[0020] Through the above technical solution, in the anti-wear structure of the rotary kiln tertiary air valve disclosed herein, the first side 211 is located upstream of the tertiary air flow direction relative to the second side 212, and at least the first side 211 is provided with a guide 3, which includes a guide hole 30. The guide 3 guides the upstream tertiary air in advance through the guide hole 30, so that the high-temperature flue gas and dust will form a uniform airflow along the guide hole 30 before entering the gate plate 21 area, avoiding local swirling due to abrupt changes in the flow channel cross section, thereby reducing the impact force of the tertiary air on the surface of the gate plate 21, and at the same time reducing the abrasion intensity of the inner lining refractory material 11, effectively avoiding the rapid pitting deformation and refractory material peeling and cracking of the gate plate 21, extending the service life of the gate plate 21, and thus helping to ensure the sealing performance and air volume adjustment accuracy of the gate plate 21, and ensuring the calcination stability in the kiln.

[0021] In this disclosure, the direction of the three wind flows is referenced Figure 1 In the direction indicated by the middle arrow, the tertiary air first passes through the guide hole 30 of the guide member 3 located on the first side 211, then through the gate 21, and finally enters the decomposition furnace 6 through the downstream pipe of the tertiary air duct 1. In this way, the tertiary air can be guided by the guide hole 30 to form a uniform airflow before entering the gate 21 area, avoiding the local swirling caused by the sudden change in the flow channel cross section.

[0022] According to exemplary embodiments of this disclosure, referring to Figure 1 As shown, both the first side 211 and the second side 212 can be equipped with flow guides 3. That is, not only are flow guides 3 provided on the upstream side of the gate 21, but also on the downstream side, forming a "double-sided flow guide". In this way, the airflow entering the gate 21 can be guided by the flow guides 3 on the first side 211 (upstream side), and then the airflow after passing through the gate 21 can be further stabilized by the flow guides 3 on the second side 212 (downstream side), avoiding the generation of secondary vortices, expanding the protection range of the gate 21 and the area where the refractory lining 11 of the tertiary air duct 1 is located, and improving the wear resistance effect.

[0023] According to exemplary embodiments of this disclosure, referring to Figure 2As shown, the flow guide 3 can be constructed as an arched structure, including an outer periphery 31 and an inner periphery 32. A cavity 10 is formed between the outer periphery 31 and the refractory lining 11 of the tertiary air duct 1, and the cavity 10 is used for pouring concrete. The inner periphery 32 forms a flow guide hole 30. In the above technical solution, the arched structure allows the inner periphery 32 to form a smooth arc-shaped flow guide channel, avoiding dead angles or vortices in the airflow within the channel. At the same time, the arched structure itself is subjected to uniform stress and can withstand thermal expansion and airflow pressure at high temperatures (e.g., 800℃-1200℃), and is not easily deformed. By pouring concrete into the cavity 10 between the outer periphery 31 and the refractory lining 11 of the tertiary air duct 1, the flow guide 3 is firmly connected to the refractory lining 11 after the concrete solidifies, preventing the flow guide 3 from shifting or falling off under high-temperature conditions, thus enhancing the stability of the overall structure.

[0024] According to an exemplary embodiment of this disclosure, the diameter of the guide hole 30 can be 1380mm to 1420mm. For example, the diameter of the guide hole 30 can be set to 1380mm, 1400mm or 1420mm to ensure that the guide hole 30 matches the flow cross section of the tertiary air duct 1. The length of each guide member 3 in the axial direction is 550mm to 650mm. For example, the length of the guide member 3 in the axial direction can be set to 550mm, 600mm or 650mm. By setting it in this way, it is ensured that the airflow has sufficient guiding distance in the guide member 3, that is, it can avoid the airflow from entering the gate 21 area before it is fully homogenized due to the length being too short, and it can also avoid the length being too long to increase the installation space of the tertiary air duct 1.

[0025] According to exemplary embodiments of this disclosure, referring to Figure 2 As shown, the guide component 3 can be constructed using kiln bricks, and includes a top hanging brick 33 and side wall kiln bricks 34 arranged on both sides of the top hanging brick 33. The top hanging brick 33 is made using a prefabricated hanging brick extension process. The kiln bricks can be either high-alumina refractory bricks or corundum mullite bricks, possessing high temperature resistance (temperature resistance ≥1600℃) and wear resistance, and can withstand the scouring of high-temperature dust materials carried by tertiary air.

[0026] In this disclosure, the side wall kiln bricks 34 can be laid vertically along the inner wall of the tertiary air duct 1, and the top hanging bricks 33 are used to build the top of the arch structure. The top hanging bricks 33 adopt a prefabricated hanging brick extension process, that is, when the top hanging bricks 33 are prefabricated in the factory, their overlap length is extended (such as the length of each hanging brick is increased by 100mm to 150mm compared with traditional hanging bricks), and an overlap groove is preset. During on-site construction, they can be directly overlapped and fixed with the side wall kiln bricks 34, reducing the difficulty of building the arch top.

[0027] According to an exemplary embodiment of this disclosure, the side wall kiln bricks 34 and the top hanging bricks 33 can be fixedly connected by interlocking masonry or a special high-temperature resistant adhesive. Interlocking masonry enhances the connection stability through mechanical structure and avoids loosening of the connection due to high temperature expansion. The special high-temperature resistant adhesive can withstand the high temperature environment of tertiary wind and has high bonding strength, further improving the integrity of the arch structure and preventing the bricks from falling off and causing the flow guide 3 to fail.

[0028] According to an exemplary embodiment of this disclosure, the thickness of the guide member 3 in the radial direction can gradually decrease from top to bottom. (Refer to...) Figure 2 As shown, the thickness of the guide member 3 in the radial direction, which is also the thickness of the guide member 3 in the radial direction of the tertiary air duct 1, can reduce the overall weight of the guide member 3 by gradually decreasing the thickness of the guide member 3 from the top (the highest point of the arch structure) to the bottom (the bottom of the side wall kiln brick 34). This reduces the bearing pressure of the refractory lining 11 of the tertiary air duct 1, and also reduces the amount of kiln bricks used, thus reducing material costs. In addition, it can also prevent the cross-section of the guide hole 30 from shrinking due to excessive thickness at the bottom, ensuring airflow efficiency.

[0029] According to exemplary embodiments of this disclosure, referring to Figure 3 As shown, the anti-wear structure of the rotary kiln tertiary air valve also includes an opening degree indicator component located on the outside of the tertiary air valve 2. The opening degree indicator component includes a dial 4 and a pointer 41. The dial 4 is marked with an opening degree range scale adapted to the kiln condition. The pointer 41 is linked with the drive mechanism 5 of the gate 21 to indicate the current opening degree of the gate 21 in real time. In the above technical solution, the drive mechanism 5 adopts an existing structure, which may include a motor, roller chain, sprocket and counterweight. This disclosure will not elaborate on this. The drive mechanism 5 is used to drive the gate 21 to move upward to increase the opening degree, or to drive the gate 21 to move downward to decrease the opening degree. Through the opening degree indicator component, the operator can accurately adjust the opening degree of the gate 21 according to the kiln condition opening degree corresponding to the scale on the dial 4, avoiding excessive wear caused by blind operation.

[0030] When the anti-wear structure of the rotary kiln tertiary air valve is used, the tertiary air carrying high-temperature flue gas and dust enters from the inlet end of the tertiary air duct 1 and first flows through the guide 3 located on the first side 211. The guide 3 guides and sorts the disordered airflow into a uniform airflow to avoid local swirling due to abrupt changes in the flow channel. After that, the airflow passes through the gate 21 and finally enters the decomposition furnace 6 through the downstream pipe of the tertiary air duct 1. When both the first side 211 and the second side 212 are equipped with flow guides 3, the difference from the above-described process is that after the airflow passes through the gate 21, it first flows through the flow guide 3 located on the second side 212, and then enters the decomposition furnace 6 through the downstream pipe of the tertiary air duct 1. The flow guide 3 located on the second side 212 will further stabilize the airflow after passing through the gate 21, prevent secondary swirling, and thus reduce the scouring and grinding of the airflow on the gate 21 and the inner lining refractory material 11 from the source.

[0031] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0032] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0033] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A wear-resistant structure for a rotary kiln tertiary air valve, characterized in that, The device includes a tertiary air valve (2) and a flow guide (3) installed at the inlet end of the tertiary air duct (1). The tertiary air valve (2) includes a gate (21), which includes a first side (211) and a second side (212) opposite to each other. The first side (211) is located upstream of the tertiary air flow direction relative to the second side (212), and at least the first side (211) is provided with the flow guide (3). The flow guide (3) includes a flow guide hole (30), which is used to guide the tertiary air to pass evenly through the area of ​​the gate (21) to reduce the local swirling flow formed by the tertiary air around the gate (21).

2. The anti-wear structure for the rotary kiln tertiary air valve according to claim 1, characterized in that, The first side (211) and the second side (212) are both provided with the flow guide (3).

3. The anti-wear structure for the rotary kiln tertiary air valve according to claim 2, characterized in that, The flow guide (3) is constructed in an arch shape and includes an outer periphery (31) and an inner periphery (32). A cavity (10) is formed between the outer periphery (31) and the refractory lining (11) of the tertiary air duct (1). The cavity (10) is used for pouring concrete. The inner periphery (32) forms the flow guide hole (30).

4. The anti-wear structure for the rotary kiln tertiary air valve according to claim 3, characterized in that, The diameter of the guide hole (30) is 1380mm to 1420mm; the length of each guide element (3) in the axial direction is 550mm to 650mm.

5. The anti-wear structure for the rotary kiln tertiary air valve according to claim 4, characterized in that, The guide component (3) is constructed of kiln bricks and includes a top hanging brick (33) and side wall kiln bricks (34) arranged on both sides of the top hanging brick (33). The top hanging brick (33) is made using a prefabricated hanging brick extension process.

6. The anti-wear structure for the rotary kiln tertiary air valve according to claim 5, characterized in that, The side wall bricks (34) and the top hanging bricks (33) are fixedly connected by interlocking masonry or special high-temperature resistant adhesive.

7. The anti-wear structure for the rotary kiln tertiary air valve according to claim 5, characterized in that, The thickness of the guide element (3) in the radial direction gradually decreases from top to bottom.

8. The anti-wear structure for the rotary kiln tertiary air valve according to any one of claims 1 to 7, characterized in that, The anti-wear structure of the rotary kiln tertiary air valve also includes an opening degree marking component located on the outside of the tertiary air valve (2). The opening degree marking component includes a dial (4) and a pointer (41). The dial (4) is marked with an opening degree range scale adapted to the kiln condition. The pointer (41) is linked with the drive mechanism (5) of the gate (21) to indicate the current opening degree of the gate (21) in real time.

Images