A device to prevent dust accumulation and wear in a flue gas cooler.

Abstract

This utility model discloses a device for preventing ash accumulation and wear in a flue gas cooler, belonging to the field of cooling equipment. It includes: a main housing, two floating connection mechanisms respectively installed at both axial ends of the main housing, two main water pipes respectively disposed on the two floating connection mechanisms, and vibration mechanisms respectively disposed on the two main water pipes. The outer ends of the main water pipes are connected to the floating connection mechanisms and the vibration mechanisms respectively. Each of the two floating connection mechanisms includes a partition assembly installed at both axial ends of the main housing and a floating sealing assembly disposed between the partition assembly and the main water pipes. The partition assembly includes a first partition and a second partition. The vibration mechanism includes a vibration motor installed on the second partition and a vibration shaft installed on the power end of the vibration motor, passing through the second partition and fixed to the main water pipes. The vibration shaft drives the main water pipes to vibrate radially, and during vibration, it causes the floating sealing assembly to press against the first partition. This utility model can perform vibration separation of accumulated ash non-destructively and efficiently, extending the equipment's lifespan.

Description

Technical Field

[0001] This utility model relates to a device for preventing dust accumulation and wear in a flue gas cooler, belonging to the field of cooling equipment. Background Technology

[0002] Low-temperature flue gas coolers are typically installed in the tail flue of a boiler. They can significantly reduce the exhaust gas temperature and recover heat from the flue gas, thereby improving unit efficiency. Their flue gas velocity is generally designed based on 9 m / s at full boiler load. This velocity effectively prevents ash accumulation and avoids premature equipment wear.

[0003] However, the load of the boiler unit is not constant, but often fluctuates between 50% and 100% load. When the boiler unit load decreases, the flue gas volume decreases accordingly, and the flue gas velocity decreases, which inevitably leads to ash accumulation in the flue duct before the flue gas cooler and inside the flue gas cooler. When the boiler load increases, the flue gas velocity increases, and most of the accumulated ash is carried away, but a small amount of caking ash remains. This cycle repeats, and the ash accumulation in the flue duct and inside the module increases, causing the pressure differential of the flue gas cooler to gradually increase. In addition, the flue gas contains a large amount of dust, some of which is large dust particles, which can easily cause wear on the flue gas cooler.

[0004] Dust in flue gas coolers is usually separated by methods such as rapping. However, existing low-temperature flue gas coolers generally use coils or array tubes for heat exchange. During the rapping process, the lifespan of pipe joints is inevitably affected. Even if rubber pipes are used for connection, although pipe fatigue during the rapping process can be solved, rubber pipes have low wear resistance and are prone to damage during the rapping process, resulting in a short lifespan and reduced water circuit sealing. In addition, long-term vibration of rubber pipes can easily cause deformation, leading to frequent problems later on. Utility Model Content

[0005] Purpose of the utility model: The purpose of this utility model is to overcome the shortcomings of the prior art and provide a device to prevent ash accumulation and wear in the flue gas cooler. It can drive the main water pipe to achieve radial vibration through the excitation mechanism, and efficiently separate the accumulated ash by vibration without damaging the connection structure. At the same time, the floating connection mechanism ensures that the water circuit is always sealed when the main water pipe vibrates, thus extending the service life of the equipment.

[0006] To solve the above-mentioned technical problems, this utility model is implemented using the following technical solution: A device for preventing dust accumulation and wear in a flue gas cooler, comprising: The main outer casing is mounted on the flue gas cooler, two floating connection mechanisms are respectively installed at both ends of the main outer casing, two main water pipes are respectively mounted on the two floating connection mechanisms, and excitation mechanisms are respectively installed on the two main water pipes; One end of the main water pipe is connected to the heat exchange chamber inside the flue gas cooler, and the other end is connected to the floating connection mechanism and the vibration mechanism respectively. Both floating connection mechanisms include a partition assembly installed at both axial ends of the main housing and a floating sealing assembly disposed between the partition assembly and the main water pipe; The partition assembly includes a first partition and a second partition, both installed on the axial end of the main housing, with the first partition connected to the main water pipe and the second partition connected to the connecting water pipe. A manifold is provided between the first partition and the second partition, which is connected to the main water pipe and the connecting water pipe. The floating sealing assembly is housed in the manifold and is located near the main water pipe. The vibration mechanism includes a vibration motor mounted on the second partition and a vibration shaft mounted on the power end of the vibration motor and fixed to the main water pipe through the second partition. The vibration shaft drives the main water pipe to vibrate radially and drives the floating sealing assembly to press against the first partition during vibration, thereby ensuring that the water path is always sealed when the main water pipe vibrates, and avoiding mixing of water and flue.

[0007] Optionally, the floating sealing assembly includes a push ring installed in the middle of the second partition and a sealing disc installed at the end of the main water pipe; The push ring has several elastic protrusions on the side facing the sealing disc, and the several elastic protrusions are distributed in a ring array. The sealing disc is provided with a plurality of sealing rings on the side facing the first partition plate, and the plurality of sealing rings are pressed tightly against the surface of the first partition plate under the compression of the elastic protrusion, thereby isolating the smoke path and the water path.

[0008] Optionally, the plurality of sealing rings are arranged concentrically, and the sealing rings are embedded on one side of the sealing disk; this is used to prevent the sealing rings from falling out of the sealing disk during the sliding process of the sealing disk, and the concentric arrangement has better sealing performance.

[0009] Optionally, the elastic protrusion is connected to the push ring via a push spring rod, with one end of the push spring rod embedded in the push ring and the other end facing the sealing disc; The sealing disc has an inlay groove on the side facing the push spring rod for fitting with the end of the push spring rod.

[0010] Optionally, the heat exchange chamber is provided with a heat exchange plate array and a flue; the main water pipe is placed at one end of the heat exchange chamber and is connected to the heat exchange plate array through a connecting plate, and the flue is separated from the main water pipe through a connecting plate and a baffle assembly.

[0011] Optionally, a third partition is also connected to the main housing, one side of the third partition is located on the side of the first partition away from the second partition, and the first partition and the third partition are provided with a support gap; The other side of the third partition faces the flue; The support gap accommodates a main floating ring, which is fitted onto the main water pipe to provide axial limiting support for the main water pipe.

[0012] Optionally, the main floating ring is provided with a plurality of support beads, which are slidably connected between the first partition and the third partition.

[0013] Optionally, the main water pipe and the third partition are abutted by a main sealing ring; The outer ring of the main sealing ring is provided with several main sealing plates, and the several main sealing plates are in elastic contact with the third partition plate to prevent smoke and dust from entering the support gap.

[0014] Optionally, a first sealing gasket ring is provided between the first partition and the third partition; a second sealing gasket ring is provided between the first partition and the second partition. The first partition, the second partition, the third partition, the first sealing gasket, and the second sealing gasket are connected in series by bolts and fixed to the end of the main housing.

[0015] Optionally, the main water pipe is provided with a support and limiting structure corresponding to the excitation mechanism. The support and limiting structure includes a limiting ring fixedly installed on the inner wall of the main water pipe, a support ring that is interference-fitted on the inner wall of the main water pipe and in contact with the limiting ring, and a connecting sleeve fixedly installed on the support ring. The connecting sleeve is connected to the end of the excitation shaft furthest from the power end; A secondary sealing ring is fitted at the insertion point between the excitation shaft and the second partition plate, and the secondary sealing ring is used to seal the connection with the second partition plate.

[0016] Beneficial effects: Compared with the prior art, this utility model has the following advantages: The main water pipe undergoes radial vibration through a vibration mechanism, which can efficiently vibrate the ash accumulation inside the flue gas cooler and reduce ash accumulation. At the same time, during the vibration of the main water pipe, the floating connection mechanism abuts against the baffle assembly, ensuring the stable separation of the water circuit and the flue gas circuit. Compared with the existing connection structure using rubber pipes, the structure of this utility model can ensure the sealing between the water circuit and the flue gas circuit during long-term use.

[0017] The concentric arrangement of several sealing rings can prevent the sealing rings from coming out of the sealing disc during the sliding process, and the concentric arrangement has better sealing performance.

[0018] Because the heat exchanger fins are connected by axial pipe insertion, the main floating ring floats in the gap between the first and third partitions through the support beads, thereby axially limiting the main water pipe and ensuring stable radial floating of the main water pipe. Attached Figure Description

[0019] Figure 1The diagram shown is a structural diagram of the device for preventing dust accumulation and wear in the flue gas cooler according to this utility model.

[0020] In the diagram: 1. Main outer shell; 2. Heat exchanger plate array; 3. Flue; 4. Connecting plate; 5. Main water pipe; 6. Third partition; 7. Main sealing ring; 8. First partition; 9. Main floating ring; 10. Support bead; 11. Second partition; 12. Connecting water pipe; 13. Manifold; 14. Sealing plate; 15. Sealing ring; 16. Pushing ring; 17. Pushing spring rod; 18. Limiting ring; 19. Supporting ring; 20. Connecting sleeve; 21. Transmission rod; 22. Vibration motor; 23. Secondary sealing ring. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example

[0022] This embodiment provides a device to prevent dust accumulation and wear in a flue gas cooler, such as... Figure 1 The device includes: a main outer shell 1, main water pipes 5, two floating connection mechanisms, and a vibration mechanism; wherein, the main outer shell 1 is installed outside the heat exchange chamber of the flue gas cooler, the two floating connection mechanisms are respectively installed at both ends of the main outer shell 1, and there are two main water pipes 5, which are respectively installed at both ends of the main outer shell 1 through the two floating connection mechanisms, and one end of each individual main water pipe 5 is connected to the heat exchange chamber inside the flue gas cooler, and the other end is connected to the floating connection mechanism and the vibration mechanism respectively; the vibration mechanism is connected to the two main water pipes 5 through the two floating connection mechanisms respectively. Both floating connection mechanisms include: a partition assembly and a floating sealing assembly. The partition assembly includes: a first partition 8 and a second partition 11. The partition assembly is installed at both axial ends of the main housing 1, and the floating sealing assembly is disposed between the partition assembly and the main water pipe 5. The first partition 8 and the second partition 11 are both fixed to both axial ends of the main housing 1. The first partition 8 is inserted into the main water pipe 5, and the second partition 11 is installed in the connecting water pipe 12 and located outside the first partition 8. A manifold 13 connecting the main water pipe 5 and the connecting water pipe 12 is provided between the first partition 8 and the second partition 11. The floating sealing assembly is housed in the manifold 13 and is located near the main water pipe 5. It is used to guide the fluid flowing between the connecting water pipe 12 and the main water pipe 5.

[0023] The vibration mechanism includes a vibration motor 22 and a vibration shaft 21. In this embodiment, the vibration motor 22 is installed on the second partition 11. The vibration shaft 21 is installed on the power end of the vibration motor 22 and passes through the second partition 11 and is fixed to the main water pipe 5. The vibration motor 22 outputs power to drive the vibration shaft 21 to vibrate, and then drives the main water pipe 5 to vibrate radially through the vibration shaft 21. When the main water pipe 5 vibrates radially, it drives the floating sealing component to press against the first partition 8, thereby ensuring that the water passage is always sealed when the main water pipe 5 vibrates, and avoiding the mixing of water passage and flue passage.

[0024] Optionally, the floating sealing assembly includes a push ring 16 and a sealing disc 14; the push ring 16 is installed in the middle of the second partition 11, and the sealing disc 14 is fitted onto the end of the main water pipe 5 and corresponds to the push ring 16; the push ring 16 has a plurality of elastic protrusions on the side facing the sealing disc 14, and the plurality of elastic protrusions are distributed in a ring array; the sealing disc 14 has a plurality of sealing rings 15 on the side facing the first partition 8, and the plurality of sealing rings 15 are sealed and pressed against the surface of the first partition 8 under the compression of the elastic protrusions, thereby isolating the flue and water passages.

[0025] Optionally, the plurality of sealing rings 15 are arranged concentrically, and the sealing rings 15 are embedded on one side of the sealing disk 14, which can prevent the sealing rings 15 from falling out of the sealing disk 14 during the sliding process, and the concentric arrangement has better sealing performance.

[0026] Optionally, the elastic protrusion is connected to the push ring 16 via a push spring rod 17, and one end of the push spring rod 17 is embedded in the push ring 16, while the other end faces the sealing disc 14; The sealing disc 14 has an inlay groove on the side facing the push spring rod 17, which is used to engage with the end of the push spring rod 17 to apply elastic force to the sealing disc 14, so that the sealing ring 15 and the first partition plate 8 are always pressed together under the action of the excitation motor 22, thus preventing fluid from entering the flue 3.

[0027] In this embodiment, the sealing ring 15 is made of brass. Brass has good wear resistance and long service life. Compared with traditional flexible materials such as rubber, it has better fatigue resistance. The elastic protrusion structure of the spring rod material has an even longer service life. This utility model uses a mechanical floating sealing structure to enable the main water pipe 5 to float and maintain a stable seal with the flue duct 3 inside the flue cooler. It also removes fly ash through real-time vibration. The floating structure replaces the soft pipe, which is not easy to age and has a longer service life.

[0028] Optionally, the heat exchange chamber is provided with a heat exchange plate array 2 and a flue 3; the main water pipe 5 is placed at one end of the heat exchange chamber and is connected to the heat exchange plate array 2 through a connecting plate 4, and the flue 3 is separated from the main water pipe 5 through the connecting plate 4 and the partition assembly.

[0029] In this embodiment, the flue 3 is connected in a floating and sealed manner through a baffle assembly and a floating seal, which can prevent the flue 3 from mixing with the fluid, prevent the leakage of corrosive or particulate matter such as dust, sulfur oxides, and nitrogen oxides, and further prevent the risk of equipment failure caused by pipeline blockage, scaling and corrosion due to the mixing of corrosive or particulate matter with water.

[0030] Optionally, a third partition 6 is also connected to the main housing 1. One side of the third partition 6 is located on the side of the first partition 8 away from the second partition 11, and the first partition 8 and the third partition 6 are provided with a support gap. The other side of the third partition 6 faces the flue 3; The support gap accommodates the main floating ring 9, which is fitted onto the main water pipe 5 and is used to provide axial limiting support for the main water pipe 5.

[0031] The main floating ring 9 is provided with a plurality of support beads 10, which are slidably connected between the first partition 8 and the third partition 6.

[0032] Because the heat exchanger fins are connected by axial pipes, in this embodiment, a third baffle is added to seal and isolate the flue 3. Furthermore, a main floating ring 9 is arranged between the first baffle 8 and the third baffle 6 to axially limit the main water pipe 5. The main floating ring 9 maintains its floating characteristics through multiple support beads 10 connected in series in the support gap. Therefore, it can prevent the main water pipe 5 from moving axially and also improve the floating sensitivity through the support beads 10.

[0033] Optionally, the main water pipe 5 and the third partition 6 are connected by a main sealing ring 7. The outer ring of the main sealing ring 7 is provided with a plurality of main sealing plates, and the plurality of main sealing plates are in elastic contact with the third partition 6, which can prevent smoke and dust from entering the support gap and avoid the support beads 10 from being worn or stuck due to dust particles.

[0034] Optionally, a first sealing gasket ring is provided between the first partition 8 and the third partition 6; a second sealing gasket ring is provided between the first partition 8 and the second partition 11. The first partition 8, the second partition 11, the third partition 6, the first sealing gasket ring, and the second sealing gasket ring are connected in series by bolts and fixed to the end of the main housing 1.

[0035] This embodiment maintains the airtightness between the partition components through the first and second sealing gaskets, while the high stability of the structure is achieved by bolts through and fixing it.

[0036] Optionally, the main water pipe 5 is provided with a support and limiting structure corresponding to the excitation mechanism. The support and limiting structure includes: a limiting ring 18, a supporting ring 19, and a connecting sleeve 20. The limiting ring 18 is fixedly installed on the inner wall of the main water pipe 5 to limit the supporting ring 19. The supporting ring 19 is interference-fitted on the inner wall of the main water pipe 5 and contacts the limiting ring 18. The connecting sleeve 20 is fixedly installed on the supporting ring 19. The connecting sleeve 20 is connected to the end of the excitation shaft 21 away from the power end; A secondary sealing ring 23 is fitted at the insertion point between the excitation shaft 21 and the second partition 11, and the secondary sealing ring 23 is used to seal the connection with the second partition 11.

[0037] In this embodiment, a connecting sleeve 20 is fixed inside the main water pipe 5 by a hollow support ring 19. The connecting sleeve 20 is fixed on the excitation shaft 21. When the excitation motor 22 is started, the power output by the motor drives the connecting sleeve 20 to vibrate, thereby causing the support ring 19 and the main water pipe 5 to vibrate radially as a whole.

[0038] Working principle: The fluid enters the manifold 13 from the connecting water pipe 12, enters the main water pipe 5 at one end through the gap between the pushing ring 16 and the sealing plate 14, and then enters the heat exchange plate array 2. After exchanging heat with the flue gas in the flue 3 in the main shell 1, it is discharged from the main water pipe 5 and the connecting water pipe 12 on the other side. During the heat exchange process, dust particles in the flue gas begin to condense upon cooling. The excitation motor 22 is started and power is transmitted to the excitation shaft 21 through the excitation motor 22. The excitation shaft 21 drives the main water pipe 5 to vibrate radially. During the vibration of the main water pipe 5, the sealing disc 14 is pressed against the surface of the first partition plate 8, which can ensure the stable separation of the water path and the flue. Meanwhile, the main floating ring 9 floats radially in the support gap through the support beads 10, and converts the axial force of the main water pipe 5 into the force of the support beads 10 sliding up and down, ensuring the stable radial floating and connection performance of the main water pipe 5. Example

[0039] This embodiment provides a device to prevent dust accumulation and wear in a flue gas cooler. With the same technical concept as Embodiment 1, optionally, the main floating ring is slidably connected to the first and third partition plates through multiple bearings connected in series in the support gap.

[0040] In summary, the main water pipe of this invention undergoes radial vibration through a vibration mechanism, which can efficiently vibrate the accumulated ash inside the flue gas cooler and reduce ash accumulation. At the same time, during the vibration of the main water pipe, the floating connection mechanism abuts against the baffle assembly, ensuring the stable separation of the water circuit and the flue gas circuit. Compared with the existing connection structure using rubber pipes, the structure of this invention can ensure the sealing between the water circuit and the flue gas circuit during long-term use.

[0041] The concentric arrangement of several sealing rings can prevent the sealing rings from coming out of the sealing disc during the sliding process, and the concentric arrangement has better sealing performance.

[0042] Because the heat exchanger fins are connected by axial pipe insertion, the main floating ring floats in the gap between the first and third partitions through the support beads, thereby axially limiting the main water pipe and ensuring stable radial floating of the main water pipe.

[0043] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A device for preventing the build-up of ash and wear in a flue gas cooler, characterized in that include: The main outer casing is mounted on the flue gas cooler, two floating connection mechanisms are respectively installed at both ends of the main outer casing, two main water pipes are respectively mounted on the two floating connection mechanisms, and excitation mechanisms are respectively installed on the two main water pipes; One end of the main water pipe is connected to the heat exchange chamber inside the flue gas cooler, and the other end is connected to the floating connection mechanism and the vibration mechanism respectively. Both floating connection mechanisms include a partition assembly installed at both axial ends of the main housing and a floating sealing assembly disposed between the partition assembly and the main water pipe; The partition assembly includes a first partition and a second partition, both installed on the axial end of the main housing, with the first partition connected to the main water pipe and the second partition connected to the connecting water pipe. A manifold is provided between the first partition and the second partition, which is connected to the main water pipe and the connecting water pipe. The floating sealing assembly is housed in the manifold and is located near the main water pipe. The vibration mechanism includes a vibration motor mounted on the second partition and a vibration shaft mounted on the power end of the vibration motor and passing through the second partition and fixed to the main water pipe. The vibration shaft drives the main water pipe to vibrate radially and drives the floating sealing assembly to press against the first partition during vibration.

2. The device for preventing the build-up of ash and wear of a flue gas cooler according to claim 1, characterized in that, The floating sealing assembly includes a push ring installed in the middle of the second partition and a sealing disc installed at the end of the main water pipe; The push ring has several elastic protrusions on the side facing the sealing disc, and the several elastic protrusions are distributed in a ring array. The sealing disc is provided with a plurality of sealing rings on the side facing the first partition plate, and the plurality of sealing rings are pressed tightly against the surface of the first partition plate under the compression of the elastic protrusion, thereby isolating the smoke path and the water path.

3. The device for preventing the build-up of ash and wear of a flue gas cooler according to claim 2, characterized in that The plurality of sealing rings are arranged concentrically and embedded on one side of the sealing disc; this is to prevent the sealing rings from coming out of the sealing disc during the sliding process of the sealing disc, and the concentric arrangement provides better sealing performance.

4. The device for preventing the build-up of ash and wear of a flue gas cooler according to claim 2, characterized in that, The elastic protrusion is connected to the push ring via a push spring rod, with one end of the push spring rod embedded inside the push ring and the other end facing the sealing disc; The sealing disc has an inlay groove on the side facing the push spring rod for fitting with the end of the push spring rod.

5. The device for preventing the build-up of ash and wear of a flue gas cooler according to claim 1, characterized in that, The heat exchange chamber is equipped with a heat exchange plate array and a flue; the main water pipe is located at one end of the heat exchange chamber and is connected to the heat exchange plate array through a connecting plate; the flue is separated from the main water pipe through a connecting plate and a partition assembly.

6. The device for preventing ash accumulation and wear in a flue gas cooler according to claim 5, characterized in that, A third partition is also connected to the main outer shell. One side of the third partition is located on the side of the first partition away from the second partition, and the first partition and the third partition are provided with a support gap. The other side of the third partition faces the flue; The support gap accommodates a main floating ring, which is fitted onto the main water pipe to provide axial limiting support for the main water pipe.

7. The device for preventing the build-up of soot and wear of a flue gas cooler according to claim 6, characterized in that The main floating ring is provided with a number of support beads, which are slidably connected between the first partition and the third partition.

8. The apparatus for preventing the build-up of ash and wear of a flue gas cooler according to claim 6, wherein The main water pipe and the third partition are connected by a main sealing ring. The outer ring of the main sealing ring is provided with several main sealing plates, and the several main sealing plates are in elastic contact with the third partition plate to prevent smoke and dust from entering the support gap.

9. The apparatus for preventing the build-up of ash and wear of a flue gas cooler according to claim 6, wherein A first sealing gasket ring is provided between the first partition and the third partition; a second sealing gasket ring is provided between the first partition and the second partition; The first partition, the second partition, the third partition, the first sealing gasket, and the second sealing gasket are connected in series by bolts and fixed to the end of the main housing.

10. The apparatus for preventing the build-up of ash and wear of a flue gas cooler according to claim 1, wherein The main water pipe is equipped with a support and limiting structure corresponding to the excitation mechanism. The support and limiting structure includes a limiting ring fixedly installed on the inner wall of the main water pipe, a support ring that is interference-fitted on the inner wall of the main water pipe and in contact with the limiting ring, and a connecting sleeve fixedly installed on the support ring. The connecting sleeve is connected to the end of the excitation shaft furthest from the power end; A secondary sealing ring is fitted at the insertion point between the excitation shaft and the second partition plate, and the secondary sealing ring is used to seal the connection with the second partition plate.

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