A multi-stage labyrinth heat exchange cavity structure for the flue gas outlet of a roller kiln

Abstract

This invention discloses a multi-stage labyrinthine heat exchange chamber structure for the flue gas outlet of a roller kiln, relating to the field of roller kiln flue gas technology. It optimizes and improves upon problems such as flue gas flow instability due to fluctuations in internal temperature and pressure and unstable flow velocity, which prevents the achievement of positive flow. Based on a pressure-dividing structure composed of vertically staggered flow-limiting and positive flow arc plates inside the outer shell, a pressure-dividing arc sleeve is provided on the upper side of the pressure-dividing structure. An electromagnetic actuation component linked to the pressure-dividing arc sleeve is located at the upper end of the outer shell. The flow-limiting and positive flow arc plates are connected to a guide rod via mounting sleeves. Spring plates are installed inside the mounting sleeves, and spring components are placed between adjacent mounting sleeves. The flow-limiting arc plates have flow-limiting bends and air inlets, the positive flow arc plates have matching air-limiting arc plates, and the pressure-dividing arc sleeve has an air sleeve. The air outlet is configured with two paths. This invention achieves graded positive flow of flue gas through a multi-stage labyrinthine channel, and achieves dynamic and precise control of flue gas velocity through an electromagnetic linkage structure. Simultaneously, elastic reset and guiding structures ensure control stability.

Description

Technical Field

[0001] This invention relates to the field of flue gas technology for roller kilns, and specifically to a multi-stage labyrinth heat exchange cavity structure for the flue gas outlet of a roller kiln. Background Technology

[0002] Taking the waste heat recovery process of roller kiln flue gas as an example, the technical essence is to use high-temperature flue gas as a heat medium to realize waste heat recovery through indirect heat exchange principle. In addition to the heat exchange principle, the heat exchange efficiency is related to the initial temperature of the heat medium and the heat exchange rate / time (contact time between the heat medium and the heated medium).

[0003] To supplement the above, under relatively constant furnace temperature and high pressure, the flue gas exits the furnace at a relatively high velocity, resulting in a relatively short contact time between the flue gas and the heated medium. According to the heat exchange formula, this means that the overall heat exchange efficiency is relatively low because heat is not fully recovered. However, it should be noted that in reality, the furnace pressure fluctuates significantly due to temperature and flue gas discharge processes, causing significant fluctuations in the flow rate / volume of the flue gas within the heat exchange structure. If a single heat exchange mode is used (with flue gas velocity too high or too low), and the waste heat recovery process is not utilized, this invention proposes a solution. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stage labyrinth heat exchange chamber structure for the flue gas outlet of a roller kiln. Because the flue gas in a roller kiln is affected by the temperature / pressure inside the furnace, the flow rate / volume fluctuates significantly when passing through the heat exchange structure. The most direct manifestation of this is that the actual heat exchange efficiency is low due to the excessively high flow rate.

[0005] The objective of this invention can be achieved through the following technical solution: a multi-stage labyrinthine heat exchange chamber structure for the flue gas outlet of a roller kiln, comprising an outer shell, an air inlet, and an air outlet. Inside the outer shell, linearly equidistant flow-limiting arc plates and positive flow arc plates are arranged in a vertical direction, and these arc plates are staggered along the vertical direction. The outer edge of the flow-limiting arc plate contacts and maintains a sliding connection with the inner wall of the outer shell. The outer edge of the positive flow arc plate has an upward-curved arc shape, and an air gap is left between the outer edge of the positive flow arc plate and the inner wall of the outer shell.

[0006] The cross-sections of the flow-limiting arc plate and the positive flow arc plate are both downward curved, and the bending center area of ​​the flow-limiting arc plate and the positive flow arc plate are both equipped with mounting sleeves. The flow-limiting arc plate has an air port at the external position corresponding to its mounting sleeve.

[0007] The configuration is further defined as follows: a pressure-dividing structure is formed by combining multiple current-limiting arc plates and positive flow arc plates, wherein the uppermost position of the pressure-dividing structure is a current-limiting arc plate, the lowermost position is a positive flow arc plate, and a voltage-transforming arc sleeve is provided on the upper side of the pressure-dividing structure.

[0008] The configuration is further defined as follows: a plurality of electromagnetic actuation components arranged in a circular array are installed at the upper end of the outer shell, and a ball-head rod penetrating into the interior of the outer shell is installed at the transmission end of the electromagnetic actuation components. The ball-head rod is slidably connected to the outer shell, and the lower end of the ball-head rod contacts the transformer arc sleeve.

[0009] The variable pressure arc sleeve is further configured such that its cross-section is an upwardly curved arc shape, and a gas sleeve is installed at the center point of the variable pressure arc sleeve to maintain a sliding connection with the outer shell.

[0010] The configuration is further defined as follows: a flow-limiting bend is provided on the lower surface of the flow-limiting arc plate at the uppermost position, and flow-limiting bends are provided on the upper and lower surfaces of the flow-limiting arc plates at other positions. The upper and lower surfaces of the positive flow arc plate are provided with air-limiting arc plates corresponding to the flow-limiting bends.

[0011] The further configuration is as follows: a coiled spring is installed inside the mounting sleeve, and a vertically arranged directional guide rod is installed at the center point of the inner wall of the outer shell. The directional guide rod passes through each mounting sleeve in sequence. One end of the coiled spring corresponding to the center point of the directional guide rod is engaged with the directional guide rod, and the other end of the coiled spring is fixedly connected to the inner wall of the mounting sleeve.

[0012] A further configuration is provided: a spring element is provided between the mounting sleeves at each adjacent position, and the normal distance between the air-limiting arc plate and the flow-limiting bend is greater than or equal to the maximum deformation of the spring element.

[0013] The configuration is further defined as follows: the air inlet is located on the lower side of the corresponding pressure-dividing structure, and the air outlet is located on the upper side of the corresponding pressure-dividing structure and the upper part of the corresponding air sleeve of the outer casing.

[0014] The present invention has the following beneficial effects:

[0015] 1. The process of guiding the flow of flue gas by forming a labyrinthine channel through the staggered distribution of flow-limiting arc plates and forward flow arc plates achieves the active extension of the flue gas flow path and the orientation and standardization of the flow direction. After the flue gas enters the cavity from the air inlet, it cannot flow straight upward due to the physical obstruction of the staggered arc plates. It is forced to make an S-shaped detour upward flow along the downward curved surface of the arc plates. This process breaks down the originally concentrated flue gas flow into multiple fine streams through the diversion action of the curved surface of the arc plates, avoiding the sudden change in local flow velocity caused by the direct impact of flue gas on the heat exchange structure. At the same time, with the sealing and flow-limiting action of the flow-limiting arc plates and the air gap guiding action of the forward flow arc plates, the fluctuating flue gas flow velocity is initially buffered and stabilized, realizing the basic forward flow guidance of the flue gas.

[0016] 2. The electromagnetic actuator, in conjunction with the vertical pushing / resetting action of the pressure-reducing arc sleeve, drives the pressure-dividing structure to dynamically adjust the arc plate spacing, achieving precise adaptive control of the flue gas velocity. When the furnace pressure increases and the flue gas velocity surges, the electromagnetic actuator receives the pressure signal and pushes downward, pushing the pressure-reducing arc sleeve downward through the ball-head rod. This generates downward pressure on the uppermost flow-limiting arc plate of the pressure-dividing structure. This downward pressure is transmitted downward, causing all mounting sleeves to slide downward along the guide rod, completing the adjustment action of reducing the arc plate spacing and narrowing the gap between the flow-limiting bend and the gas-limiting arc plate. The flue gas flow resistance increases accordingly, achieving a rapid reduction in flow velocity. When the furnace pressure decreases and the flue gas velocity is too slow, the electromagnetic actuator performs an upward resetting action. The ball-head rod moves upward to release the pressure on the pressure-reducing arc sleeve, and the spring and coil spring release elastic potential energy, pushing the mounting sleeve to slide upward along the guide rod to reset. This completes the adjustment action of widening the arc plate spacing and the fit gap, reducing the flue gas flow resistance and effectively increasing the flow velocity. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a multi-stage labyrinth heat exchange cavity at the flue gas outlet of a roller kiln proposed in this invention;

[0019] Figure 2 This is a cross-sectional view of the outer shell of the present invention;

[0020] Figure 3 For the present invention Figure 2 Cross-sectional view of the neutral flow arc plate and the flow-limiting arc plate;

[0021] Figure 4 For the present invention Figure 3 The front view;

[0022] Figure 5 This is a schematic diagram of the current-limiting arc plate in this invention;

[0023] Figure 6 This is a schematic diagram of the positive flow arc plate in this invention;

[0024] Figure 7 This is a cross-sectional view of the positive flow arc plate and the current limiting arc plate relative to the mounting sleeve in this invention.

[0025] In the diagram: 1. Outer shell; 2. Electromagnetic actuation assembly; 101. Air outlet; 102. Air inlet; 3. Transformer arc sleeve; 301. Air sleeve; 4. Mounting sleeve; 401. Spring coil; 402. Spring component; 5. Flow limiting arc plate; 501. Flow limiting bend; 6. Flow guiding arc plate; 601. Air limiting arc plate; 602. Air inlet; 7. Guide rod. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1: This example addresses the technical problem of unstable flow velocity / flow rate of flue gas in roller kilns due to fluctuations in furnace temperature and pressure, leading to low waste heat recovery efficiency caused by excessively high flow velocity. It proposes a basic scheme for a multi-stage labyrinthine heat exchange chamber structure at the exhaust port of roller kilns. This structure is mainly applied to waste heat recovery systems at the exhaust ports of roller kilns in various industries such as ceramics, building materials, and metallurgy. It is adaptable to the exhaust conditions of roller kilns of different specifications and can be directly connected to the kiln exhaust pipe to achieve heat exchange and waste heat recovery of high-temperature flue gas.

[0028] Reference Figures 1-7 The multi-stage labyrinth heat exchange cavity structure of the flue gas outlet of a roller kiln in this embodiment includes an outer shell 1, an air inlet 102, and an air outlet 101. Inside the outer shell 1, flow-limiting arc plates 5 and positive flow arc plates 6 are linearly and equidistantly arranged in the vertical direction, and the two are arranged in an alternating layout. The outer edge of the flow-limiting arc plate 5 is in contact with the inner wall of the outer shell 1 and maintains a sliding connection relationship, and can slide vertically along the inner wall of the outer shell 1. The outer edge of the positive flow arc plate 6 is designed to be an upward curved arc shape, and an air gap is reserved between its outer edge and the inner wall of the outer shell 1.

[0029] Both the flow-limiting arc plate 5 and the flow-directing arc plate 6 have downward curved arc cross-sections that conform to the fluid dynamics characteristics of flue gas flow. The bending center area of ​​both is fixedly equipped with an installation sleeve 4. The flow-limiting arc plate 5 also has an air port 602 at the external position corresponding to its installation sleeve 4.

[0030] The basic operation process of this embodiment: The flue gas generated by the roller kiln enters the cavity from the air inlet 102 corresponding to the lower side of the pressure-dividing structure below the outer shell 1. Theoretically, the flue gas flows vertically from bottom to top. However, because the flow-limiting arc plate 5 and the positive flow arc plate 6 are vertically staggered, the flue gas cannot flow randomly upward in a straight line. It is forced to flow upward in a detour along the labyrinthine channel formed by the downward curved surface of the flow-limiting arc plate 5 and the positive flow arc plate 6. This labyrinthine channel structure directly extends the flow path of the flue gas in the cavity.

[0031] At the same time, the fluid dynamics characteristics are used to guide the directional flow of flue gas and avoid sudden changes in flow velocity caused by flue gas crossflow. Specifically, this is manifested in the structural characteristics of the flow-limiting arc plate 5 and the flow-directing arc plate 6. Although the flue gas does flow from bottom to top, under the structural characteristics of the arc-shaped curved surface on the lower surface of the two, the flue gas with excessively fast flow velocity is "diverted" under the action of the arc-shaped curved surface. This can also generate an upward thrust on the two, avoiding the direct "impact" of the flue gas and making it difficult to limit its flow velocity, thus achieving the initial positive flow guidance of the flue gas.

[0032] The sliding seal between the flow-limiting arc plate 5 and the inner wall of the outer shell 1 prevents flue gas from freely flowing through the gap between the flow-limiting arc plate 5 and the outer shell 1. Flue gas can only flow through the air port 602 on the flow-limiting arc plate 5 or the gap between the arc plates, thus achieving basic flow restriction of the flue gas. (Refer to...) Figure 4 This can be understood as:

[0033] The flue gas essentially flows in an S-shaped direction under the action of the flow-limiting arc plate 5 and the flow-directing arc plate 6. For example, the flue gas first enters the bottom flow-directing arc plate 6, and eventually slowly gathers in the gap between the flow-limiting arc plate 5 and the flow-directing arc plate 6. Then, it is transferred upward through the air port 602. The air gap between the flow-directing arc plate 6 and the inner wall of the outer shell 1 provides a directional mainstream channel for the flue gas. With the help of the air port 602 on the flow-limiting arc plate 5, the flue gas can be evenly distributed, avoiding the sudden increase in local flow velocity caused by the accumulation of flue gas in a single channel. This allows the fluctuating flue gas flow velocity to be initially buffered and stabilized. Finally, the flue gas is discharged through the air outlet 101 on the upper side of the outer shell 1, completing the basic flue gas discharge process. It should also be noted that the flue gas not only flows in an S-shaped direction, but is also affected by the curved surface of the flow-limiting arc plate 5 and the flow-directing arc plate 6, which will also cause the flow direction to change up and down. The ultimate goal is to stabilize the flue gas flow velocity.

[0034] This basic structure solves the problem of disordered flue gas flow from a structural level through the combined effects of labyrinthine channel guidance, flow-limiting arc plate sealing and flow restriction, and gas outlet diversion and buffering. It achieves the initial stabilization of flue gas velocity. At the same time, the downward curved arc plate design fits the flue gas flow characteristics, reduces the resistance of flue gas flow, and avoids the problem of poor flue gas exhaust caused by flow restriction.

[0035] Example 2: This example mainly explains the overall flue gas pressure distribution process step by step based on the structural characteristics of the flow-limiting arc plate and the positive flow arc plate:

[0036] Based on Embodiment 1, this embodiment further designs and optimizes the cavity structure. By adding structural components such as the variable pressure arc sleeve 3, electromagnetic actuation component 2, coiled spring 401, spring component 402, and directional guide rod 7, a multi-stage pressure-dividing speed control structure is formed in conjunction with the flow-limiting arc plate 5 and the forward flow arc plate 6. This structure can achieve dynamic and precise speed control of flue gas according to the temperature and pressure fluctuations in the furnace, further improving the stability of the forward flow of flue gas and adapting to the dynamic operating conditions of the roller kiln exhaust. The structure of this embodiment is further configured based on Embodiment 1 as follows:

[0037] Multiple flow-limiting arc plates 5 and positive flow arc plates 6 are interleaved to form an integrated pressure-dividing structure. The uppermost position of the pressure-dividing structure is the flow-limiting arc plate 5, and the lowermost position is the positive flow arc plate 6. A transformer arc sleeve 3 is also provided on the upper side of the pressure-dividing structure.

[0038] Multiple electromagnetic actuators 2 arranged in a ring array are installed at the upper end of the outer shell 1. The transmission end of the electromagnetic actuator 2 is equipped with a ball-head rod that penetrates into the interior of the outer shell 1. The ball-head rod is slidably connected to the outer shell 1, and its lower end directly contacts the transformer arc sleeve 3. It can drive the transformer arc sleeve 3 to move synchronously through its own vertical movement. The electromagnetic actuator 3 is essentially an actuator. The simplest structure is an electric push rod structure in the form of electromagnetic transmission. The cross-section of the transformer arc sleeve 3 is designed as an upward curved arc shape. An air sleeve 301 is installed at its center point. The air sleeve 301 is slidably connected to the outer shell 1 and can slide vertically with the transformer arc sleeve 3.

[0039] The flow-limiting arc plate 5 at the top of the pressure-dividing structure is provided with a flow-limiting bend 501 only on its lower surface. The flow-limiting arc plates 5 at other positions are provided with flow-limiting bends 501 on both the upper and lower surfaces. The upper and lower surfaces of the positive flow arc plate 6 are integrally formed with gas-limiting arc plates 601 that are adapted to the flow-limiting bend 501. The gas-limiting arc plates 601 can cooperate with the flow-limiting bend 501 to form a fitting gap.

[0040] The mounting sleeve 4 is equipped with a coil spring 401 inside. A directional guide rod 7 is vertically fixed at the center point of the inner wall of the outer shell 1. The directional guide rod 7 passes through the mounting sleeve 4 on each flow-limiting arc plate 5 and the flow-directing arc plate 6 in sequence, providing guidance for the movement of the mounting sleeve 4. One end of the coil spring 401 corresponding to the center point of the directional guide rod 7 is engaged and fixed with the directional guide rod 7, and the other end is fixedly connected to the inner wall of the mounting sleeve 4.

[0041] A spring element 402 is also provided between two adjacent mounting sleeves 4, and the normal distance between the air limiting arc plate 601 and the flow limiting bend 501 is greater than or equal to the maximum deformation of the spring element 402, so as to avoid structural interference between the air limiting arc plate 601 and the flow limiting bend 501 during the deformation of the spring element 402. The air inlet 102 is still located on the lower side of the pressure dividing structure, and the air outlet 101 is dual-path, which is respectively opened on the upper side of the pressure dividing structure and the upper part of the outer shell 1 corresponding to the air sleeve 301.

[0042] The detailed operation process of this embodiment is as follows: After the flue gas enters the cavity from the air inlet 102, it first contacts the positive flow arc plate 6 at the bottom of the pressure dividing structure. Part of the flue gas flows upward in a directional direction along the air gap between the positive flow arc plate 6 and the inner wall of the outer shell 1, while the other part of the flue gas flows along the downward curved surface of the positive flow arc plate 6 to the upper flow limiting arc plate 5.

[0043] Because the flow-limiting arc plate 5 slides and seals with the inner wall of the outer shell 1, the flue gas can only flow upward through the air port 602 on the flow-limiting arc plate 5 or the gap between the flow-limiting bend 501 and the air-limiting arc plate 601. Through the alternating flow-limiting and diversion effects of the multi-stage flow-limiting arc plate 5 and the forward flow arc plate 6, the flue gas flows in a step-by-step meandering manner in the labyrinthine channel. During this process, the matching and cooperation between the flow-limiting bend 501 and the air-limiting arc plate 601 forms a secondary flow-limiting channel for the flue gas, further dismantling the flow pressure of the flue gas and realizing multi-stage pressure division of the flue gas. This allows the flue gas flow rate to be buffered and stabilized step by step, effectively avoiding the problem of sudden increase or decrease in flow rate caused by sudden pressure changes. At the same time, the multi-stage pressure division design makes the forward flow guidance of the flue gas more precise and the flow state more stable.

[0044] When the pressure inside the kiln increases, causing a sudden increase in flue gas velocity, the flue gas pressure inside the outer shell 1 will rise synchronously and be fed back to the electromagnetic actuation component 2. After receiving the pressure signal, the electromagnetic actuation component 2 will start and push the ball head rod at its transmission end to slide downward along the outer shell 1. When the ball head rod moves downward, it directly squeezes the pressure-changing arc sleeve 3, causing the pressure-changing arc sleeve 3 to move vertically downward along the guide rod 7, thereby generating a downward squeezing force on the flow-limiting arc plate 5 at the top of the pressure-dividing structure.

[0045] The extrusion pressure is transmitted downwards to the entire pressure distribution structure through the uppermost flow-limiting arc plate 5, causing the spring 402 between adjacent mounting sleeves 4 to be compressed and undergo elastic deformation. The mounting sleeve 4 slides downwards along the directional guide rod 7, the distance between the flow-limiting arc plate 5 and the positive flow arc plate 6 is reduced, and the fit clearance between the flow-limiting bend 501 and the gas-limiting arc plate 601 is also reduced simultaneously. The flow resistance of the flue gas is increased accordingly, thereby effectively reducing the flue gas velocity.

[0046] At the same time, when the mounting sleeve 4 slides downward, the coiled spring 401 inside it will twist due to the relative movement between the mounting sleeve 4 and the directional guide rod 7, storing elastic potential energy. Secondly, it should also be noted that:

[0047] The pressure-changing arc sleeve 3 can also switch the direction of flue gas discharge. Firstly, when the pressure-changing arc sleeve 3 is in full contact with the uppermost flow-limiting arc plate 5, the flue gas can only be discharged from the upper outlet 301 of the corresponding gas sleeve 301. Conversely, when there is a gap between the pressure-changing arc sleeve 3 and the uppermost flow-limiting arc plate 5, the flue gas can be discharged from two outlets 101. This further reduces the flue gas pressure after the flue gas has undergone pressure disassembly.

[0048] When the pressure inside the kiln decreases, causing the flue gas velocity to slow down, the electromagnetic actuation component 2 drives the ball head rod to slide upward and reset, releasing the compressive force on the pressure-reducing arc sleeve 3. At this time, the compressed spring 402 releases its elastic potential energy, generating an upward rebound force, which pushes the adjacent mounting sleeve 4 to slide upward and reset along the directional guide rod 7. The coil spring 401 also releases its torsional elastic potential energy simultaneously, causing the mounting sleeve 4 to rotate slightly, so that the distance between the flow-limiting arc plate 5 and the positive flow arc plate 6 returns to its initial state. The gap between the flow-limiting bend 501 and the gas-limiting arc plate 601 also expands accordingly, reducing the flow resistance of the flue gas and effectively increasing the flue gas velocity.

[0049] During the vertical movement of the variable pressure arc sleeve 3, the air sleeve 301 at its center point will slide vertically simultaneously. When the flue gas pressure inside the cavity is too high, the air sleeve 301 can achieve auxiliary exhaust at the top of the cavity. With the design of the dual exhaust port 101, part of the flue gas is discharged from the exhaust port 101 on the upper side of the pressure-dividing structure, and the other part of the flue gas is discharged from the exhaust port 101 at the top of the outer shell 1 through the air sleeve 301. This effectively balances the pressure inside the cavity and avoids sudden changes in flow rate caused by local accumulation of flue gas. At the same time, the dual exhaust design also ensures the smoothness of flue gas exhaust and avoids the accumulation of flue gas in the kiln due to flow restriction and speed control.

[0050] Throughout the entire operation, the directional guide rod 7 provides a precise guide reference for the vertical sliding and rotation of all mounting sleeves 4, effectively preventing the displacement of the flow-limiting arc plate 5 and the positive flow arc plate 6 due to uneven force, ensuring the overall stability of the pressure-distributing structure, preventing channel blockage or uneven fit clearance caused by arc plate displacement, keeping the flue gas flow channel stable at all times, and providing a reliable structural foundation for positive flow speed control.

[0051] The dual elastic reset structure formed by the coil spring 401 and the spring 402 can achieve rapid and precise reset of the positions of the flow-limiting arc plate 5 and the positive flow arc plate 6, ensuring the timeliness and accuracy of flow rate control. This allows the flue gas velocity to be dynamically adapted according to the temperature and pressure fluctuations in the furnace, always maintaining a stable positive flow range. Essentially, this ensures that one end of the coil spring 401 remains in contact with the inner wall of the mounting sleeve 4. To facilitate the subsequent installation process of the flow-limiting arc plate 5 and the positive flow arc plate 6 relative to the guide rod 7, the other end of each coil spring 401 is in a snap-fit ​​state with the guide rod 7. At the same time, the slight rotation generated by the coil spring 401 driving the mounting sleeve 4 makes the fit gap between the flow-limiting bend 501 and the gas-limiting arc plate 601 change more evenly, making the contact between the flue gas and the fit gap more uniform. This avoids uneven local flow velocity caused by excessively narrow or wide gaps, further improving the overall effect of positive flow control of flue gas.

[0052] In addition, the air inlet 602 on the flow-limiting arc plate 5 continuously plays a multi-stage uniform flow-diversion role throughout the entire flue gas flow process. At each stage of the flow-limiting arc plate 5, the flue gas is diverted and buffered to avoid a sudden increase in flow velocity caused by excessive flue gas flow in a single channel. This ensures that the flue gas maintains a stable positive flow state throughout the entire cavity flow process, achieving stable flow velocity control from inlet to outlet.

[0053] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-stage labyrinthine heat exchange chamber structure for the flue gas outlet of a roller kiln, comprising an outer shell (1), an air inlet (102), and an air outlet (101), characterized in that, The outer shell (1) is provided with linearly equidistant flow-limiting arc plates (5) and positive flow arc plates (6) arranged in the vertical direction. The flow-limiting arc plates (5) and positive flow arc plates (6) are staggered in the vertical direction. The outer edge of the flow-limiting arc plate (5) is in contact with the inner wall of the outer shell (1) and maintains a sliding connection. The outer edge of the positive flow arc plate (6) is in an upward curved shape, and an air gap is left between the outer edge of the positive flow arc plate (6) and the inner wall of the outer shell (1). The cross-sections of the flow-limiting arc plate (5) and the positive flow arc plate (6) are both downward curved, and the bending center point areas of the flow-limiting arc plate (5) and the positive flow arc plate (6) are both equipped with mounting sleeves (4). The flow-limiting arc plate (5) has an air port (602) at the external position of its mounting sleeve (4).

2. The multi-stage labyrinth heat exchange cavity structure for the flue gas outlet of a roller kiln according to claim 1, characterized in that, A pressure-dividing structure is formed by combining multiple flow-limiting arc plates (5) and positive flow arc plates (6). The uppermost position of the pressure-dividing structure is the flow-limiting arc plate (5), the lowermost position is the positive flow arc plate (6), and a voltage-changing arc sleeve (3) is provided on the upper side of the pressure-dividing structure.

3. The multi-stage labyrinth heat exchange cavity structure for the flue gas outlet of a roller kiln according to claim 2, characterized in that, Multiple electromagnetic actuators (2) arranged in a ring array are installed at the upper end of the outer shell (1). A ball head rod that penetrates into the interior of the outer shell (1) is installed at the transmission end of the electromagnetic actuator (2). The ball head rod is slidably connected to the outer shell (1), and the lower end of the ball head rod contacts the transformer arc sleeve (3).

4. The multi-stage labyrinthine heat exchange cavity structure for the flue gas outlet of a roller kiln according to claim 2, characterized in that, The cross-section of the variable pressure arc sleeve (3) is an upward curved arc shape, and a gas sleeve (301) that is slidably connected to the outer shell (1) is installed at the center point of the variable pressure arc sleeve (3).

5. The multi-stage labyrinth heat exchange cavity structure for the flue gas outlet of a roller kiln according to claim 4, characterized in that, The flow-limiting arc plate (5) at the top is provided with a flow-limiting bend (501) on its lower surface. The flow-limiting arc plates (5) at other positions are provided with flow-limiting bends (501) on both the upper and lower surfaces. The positive flow arc plate (6) is provided with a gas-limiting arc plate (601) corresponding to the flow-limiting bend (501) on both the upper and lower surfaces.

6. The multi-stage labyrinthine heat exchange cavity structure for the flue gas outlet of a roller kiln according to claim 5, characterized in that, The mounting sleeve (4) is equipped with a coil spring (401), and a vertically arranged guide rod (7) is installed at the center point of the inner wall of the outer shell (1). The guide rod (7) passes through each mounting sleeve (4) in sequence. One end of the coil spring (401) corresponding to the center point of the guide rod (7) is engaged with the guide rod (7), and the other end of the coil spring (401) is fixedly connected to the inner wall of the mounting sleeve (4).

7. The multi-stage labyrinth heat exchange cavity structure for the flue gas outlet of a roller kiln according to claim 6, characterized in that, A spring element (402) is provided between each adjacent mounting sleeve (4), and the normal distance between the air-limiting arc plate (601) and the flow-limiting bend (501) is greater than or equal to the maximum deformation of the spring element (402).

8. The multi-stage labyrinth heat exchange cavity structure for the flue gas outlet of a roller kiln according to claim 7, characterized in that, The air inlet (102) is located on the lower side of the corresponding pressure dividing structure, and the air outlet (101) is located on the upper side of the corresponding pressure dividing structure and on the upper part of the outer shell (1) corresponding to the air sleeve (301).

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