Boiler flue gas and air heater integrated waste heat utilization device

Abstract

The invention discloses a boiler flue gas and air heater integrated waste heat utilization device which comprises a shell, a water inlet main pipe is arranged at the top of the interior of the shell, the bottom of the water inlet main pipe communicates with a capillary pipe, a water outlet main pipe is arranged at the bottom of the interior of the shell, and an air inlet hole is formed in the left side of the shell; one side of the flue gas purification assembly communicates with the left side of the shell, the flue gas purification assembly is used for filtering and removing boiler flue gas, one side of the water body filtering assembly communicates with the left side of the shell, the water body filtering assembly is used for filtering waste heat water, and the water body filtering assembly is used for filtering waste heat water. The invention relates to the technical field of waste heat utilization devices. According to the boiler flue gas and air heater integrated waste heat utilization device, the special flue gas purification assembly is arranged before the flue gas enters the device, so that the flue gas can be fully treated before participating in waste heat recovery, and the possibility that smoke dust accumulates in the internal space is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of waste heat utilization devices, specifically an integrated waste heat utilization device for boiler flue gas and a heater. Background Technology

[0002] Boiler flue gas typically has characteristics such as high temperature, fine dust entrainment, and unstable moisture content before being emitted. If it is emitted directly without effective treatment, it will not only waste energy but also affect the surrounding environment.

[0003] Patent CN113310065A discloses a boiler flue gas waste heat utilization device, which includes: a housing, a support column, a flue pipe, and a stirring wheel; the housing is filled with a heat exchange liquid, the support column is attached to the inside of the housing, the flue pipe is attached to the outer wall of the support column, and the first end of the flue pipe penetrates the bottom wall of the housing; the stirring wheel is disposed inside the housing, and the stirring wheel includes a central shaft, a frustum, and a fan plate, the two ends of the central shaft are movably connected to the inner side wall of the housing, the frustum is fixed to the outer wall of the central shaft, the fan plate is installed on the outer wall of the frustum, and the second end of the flue pipe faces the fan plate.

[0004] As shown in the above technologies, most common waste heat recovery devices currently use heat exchanger tube bundles or warm air devices as their core, achieving waste heat recovery through heat exchange between flue gas and water or air. However, traditional waste heat recovery devices generally have two shortcomings: First, the flue gas does not have suitable purification components before entering the heat exchange structure, and some flue gas dust will directly accumulate inside the device, leading to increased resistance and decreased heat exchange efficiency after long-term operation, and making later maintenance more difficult; Second, although some devices have a water-side circulation structure, they lack dedicated components for pre-filtering the water, and the water entering the heat exchange section may carry impurities, thus affecting the smoothness of the water circuit, and even causing the pipeline to become blocked after long-term operation, reducing the overall waste heat recovery capacity. Existing boiler waste heat recovery devices are still insufficient in terms of cleaning methods for flue gas purification structures. Many devices require complete disassembly of the filter components for cleaning, which is not only time-consuming, but also unsuitable for the frequent maintenance needs in industrial environments. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an integrated waste heat utilization device for boiler flue gas and air heater. This solves the problems of flue gas not being properly purified before entering the heat exchange structure, resulting in some dust being directly deposited, and the lack of dedicated components for pre-filtration of water, which may cause water entering the heat exchange section to carry impurities and thus affect the smoothness of the water flow.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an integrated waste heat utilization device for boiler flue gas and a heater, comprising: The housing has a main water inlet pipe at the top inside, a capillary tube connected to the bottom of the main water inlet pipe, a main water outlet pipe at the bottom inside the housing, an air inlet on the left side of the housing, and an air outlet on the right side of the housing. A flue gas purification component, one side of which is connected to the left side of the housing, is used to filter and remove boiler flue gas. The flue gas purification component includes an operating pipe connected to the left side of the housing, a guide pipe connected to the left side surface of the operating pipe, and a filter plate fixedly connected to the inner wall of the operating pipe. A water filtration assembly, one side of which is connected to the left side of the housing, is used to filter waste water.

[0007] Preferably, a waste plate is movably connected to the bottom of the operating tube, a threaded groove block is fixedly connected to the outer side of the surface of the waste plate, a screw is threadedly connected to the inner wall of the threaded groove block, and a positioning groove block is threadedly connected to the surface of the screw.

[0008] Preferably, a top sealing plate is fixedly connected to the top of the operating tube, and a drive motor is fixedly connected to the top of the top sealing plate via a motor mount.

[0009] Preferably, one end of the output shaft of the drive motor is fixedly connected to an eccentric wheel via a coupling, a push plate is movably connected to one side of the surface of the eccentric wheel, and a push rod is fixedly connected to the bottom of the push plate.

[0010] Preferably, a sliding plate is fixedly connected to the bottom end of the push rod, and a contact rod is fixedly connected to the middle of the bottom of the sliding plate.

[0011] Preferably, a return spring is fixedly connected to the bottom of the sliding plate, and a baffle is fixedly connected to the bottom end of the return spring.

[0012] Preferably, the water filtration assembly includes a control pipe communicating with the left side of the housing, and an annular plate is fixedly connected to the inner wall of the control pipe.

[0013] Preferably, a filter cover is fixedly connected to the top of the ring plate, and a lifting ring is fixedly connected to the top of the filter cover.

[0014] This invention provides an integrated waste heat utilization device for boiler flue gas and a warm air heater. Compared with the prior art, it has the following advantages: 1. This integrated waste heat recovery device for boiler flue gas and air heater utilizes a dedicated flue gas purification component before the flue gas enters the device. This ensures the flue gas is thoroughly treated before participating in waste heat recovery, significantly reducing the possibility of dust accumulation in the internal space. Furthermore, the flue gas purification component incorporates a structure that facilitates the operation of the drive mechanism, allowing the filter plates to achieve stable vibration. This facilitates the falling of deposited dust from the filter position into the bottom space, maintaining the long-term unobstructed flow of the filter structure. The advantage of this structure is that the collected dust can be separated through an independent structure at the bottom. The bottom plate can be easily opened without disassembling the entire component, allowing maintenance personnel to directly empty the collected dust. Compared to traditional methods that require disassembling filter plates and cleaning internal pipe residues, this device has a clear maintenance process with fewer steps. It is particularly suitable for boiler systems operating in environments with frequent fluctuations in dust levels, improving the durability of the filter unit and reducing downtime.

[0015] 2. This integrated waste heat recovery device for boiler flue gas and air heaters features an independent water filtration assembly in its water circuit. This allows the water entering the waste heat exchange area to be filtered before entering, reducing the impact of impurities on the water system. The assembly uses an independent, detachable filter cover structure, which can be easily installed and removed using a top lifting ring. This eliminates the inconvenience of traditional water filtration devices that require additional tools or pipe disassembly for replacement. The filter cover's dimensions are adapted to the control pipes to ensure stability after installation without affecting normal water flow. This structural arrangement makes water-side filtration maintenance and replacement more direct, effectively solving the common problem of blockage caused by impurities in the water after long-term operation of waste heat recovery equipment, thus ensuring continuous water circulation and high heat exchange efficiency.

[0016] 3. This integrated waste heat recovery device for boiler flue gas and air heater combines the flue gas purification structure and the air heater waste heat recovery structure into a single housing. This allows the flue gas flow path, water flow path, and purification components to work collaboratively within a compact space. This not only reduces the complexity of piping connections required by traditional separate installations but also lowers the installation footprint. The drive mechanism uses an external motor and eccentric wheel combination, enabling the filter structure to operate periodically and continuously maintain the working state of the purification components. The multi-stage transmission structure between the drive mechanism and the filter components ensures smooth operation and facilitates maintenance personnel to inspect from the top. Within the main structure, each major component is installed independently and modularly, allowing the flue gas-side filter unit, water-side filter unit, and drive mechanism to be disassembled and maintained individually, making it ideal for long-term continuous operation. The overall structure not only fully utilizes the waste heat from the flue gas but also effectively improves the device's service life and operational reliability through its modular design. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 For the present invention Figure 1 A magnified view of a section at point A in the middle; Figure 3 For the present invention Figure 1 A magnified view of a section at point B in the middle; Figure 4 This is a cross-sectional view of the present invention; Figure 5 For the present invention Figure 4 A magnified view of a section at point C; Figure 6 For the present invention Figure 4 A magnified view of a section at point D.

[0018] In the diagram: 1. Shell; 2. Inlet main pipe; 3. Capillary tube; 4. Outlet main pipe; 5. Flue gas purification assembly; 51. Operating pipe; 52. Guide pipe; 53. Filter plate; 54. Waste plate; 55. Threaded groove block; 56. Screw; 57. Positioning groove block; 58. Top sealing plate; 59. Drive motor; 510. Eccentric wheel; 511. Push plate; 512. Push rod; 513. Sliding plate; 514. Return spring; 515. Baffle; 516. Contact rod; 6. Water filtration assembly; 61. Control pipe; 62. Ring plate; 63. Filter cover; 64. Lifting ring; 7. Air inlet; 8. Air outlet. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0020] Please see Figures 1-6 This invention provides two technical solutions: Example 1: An integrated waste heat utilization device for boiler flue gas and air heater, comprising: The housing 1 has a water inlet main pipe 2 at the top inside the housing 1, and a capillary tube 3 connected to the bottom of the water inlet main pipe 2. The water outlet main pipe 4 is located at the bottom inside the housing 1, and the water outlet at the bottom of the capillary tube 3 is connected to the water outlet main pipe 4. An air inlet 7 is opened on the left side of the housing 1, and an air outlet 8 is opened on the right side of the housing 1. The flue gas purification component 5 is connected to the left side of the housing 1 on one side and to the air inlet 7 on the other side. The flue gas purification component 5 is used to filter and remove boiler flue gas. The flue gas purification component 5 includes an operating pipe 51 connected to the left side of the housing 1. A guide pipe 52 is connected to the left side surface of the operating pipe 51. The guide pipe 52 cannot be located at the bottom left side of the operating pipe 51 because the bottom of the operating pipe 51 is used to receive the filtered dust. A filter plate 53 is fixedly connected to the inner wall of the operating pipe 51. The position where the top surface of the filter plate 53 contacts the contact rod 516 is set as an elastic plate, and the remaining positions are set with filter elements. The outermost layer of the filter plate 53 is a rigid frame. The water filtration assembly 6 is connected to the left side of the housing 1 on one side and to the main water inlet pipe 2. The water filtration assembly 6 is used to filter waste water. By installing a dedicated flue gas purification assembly 5 before the flue gas enters the device, the flue gas can be fully treated before participating in waste heat recovery, significantly reducing the possibility of dust accumulation in the internal space. Furthermore, the flue gas purification assembly 5 has a structure that facilitates the operation of the driving mechanism, allowing the filter plate 53 to achieve stable vibration, facilitating the falling of deposited dust from the filtration position into the bottom space, thus maintaining the long-term unobstructed flow of the filtration structure. The advantage of this structure is that after the dust is collected, it can be separated through an independent structure at the bottom. The bottom plate can be easily opened without disassembling the entire assembly, allowing maintenance personnel to directly empty the collected dust. Compared to traditional methods that require disassembling the filter plate 53 and cleaning residues inside the pipes, the maintenance process of this device is clear and involves fewer steps. It is particularly suitable for operating environments in boiler systems where dust levels frequently fluctuate, improving the durability of the filtration unit and reducing downtime.

[0021] Example 2 differs from Example 1 mainly in that: an integrated waste heat utilization device for boiler flue gas and a heater is provided, wherein a waste plate 54 is movably connected to the bottom of the operating pipe 51, a threaded groove block 55 is fixedly connected to the outer surface of the waste plate 54, a screw 56 is threadedly connected to the inner wall of the threaded groove block 55, a positioning groove block 57 is threadedly connected to the surface of the screw 56, one side of the positioning groove block 57 is fixedly connected to the surface of the operating pipe 51, and a top sealing plate 58 is fixedly connected to the top of the operating pipe 51, and a drive motor is fixedly connected to the top of the top sealing plate 58 via a motor base. The drive motor 59 has a built-in reducer. One end of the output shaft of the drive motor 59 is fixedly connected to an eccentric wheel 510 via a coupling. The eccentric wheel 510 is mainly responsible for reciprocatingly driving the push plate 511, thereby ultimately driving the contact rod 516 to press down. The push plate 511 is movably connected to one side of the surface of the eccentric wheel 510. The bottom of the push plate 511 is fixedly connected to a push rod 512. The bottom end of the push rod 512 passes through the top sealing plate 58 and extends to the bottom of the top sealing plate 58. The bottom end of the push rod 512 is fixedly connected to a sliding plate 513. A contact rod 516 is fixedly connected in the middle. The contact rod 516 is a rigid rod. It directly presses down on the filter plate 53 to make the filter plate 53 vibrate, so that the dust on the bottom of the surface of the filter plate 53 falls directly. A return spring 514 is fixedly connected to the bottom of the sliding plate 513. A damper is set on the inner wall of the return spring 514. A baffle 515 is fixedly connected to the bottom end of the return spring 514. One side of the baffle 515 is fixedly connected to one side of the inner wall of the operating pipe 51. The water filtration assembly 6 includes a control pipe 61 that communicates with the left side of the housing 1. The inner wall of the control pipe 61... A ring plate 62 is fixedly connected to the wall, completely preventing the filter cover 63 from falling off. The filter cover 63 is fixedly connected to the top of the ring plate 62. The size of the filter cover 63 is adapted to the control pipe 61. Once the filter cover 63 is installed, there is a small gap between it and the control pipe 61, which affects the filtration effect. A lifting ring 64 is fixedly connected to the top of the filter cover 63. The surface of the lifting ring 64 is equipped with an anti-slip pad. An independent water filtration component 6 is set in the water circuit, so that the water entering the waste heat exchange area can be filtered before entering, thereby reducing the impact of impurities in the water circuit. This component adopts an independent and detachable filter cover 63 structure, which can be installed and removed by lifting the top ring 64, reducing the inconvenience of traditional water filtration devices that require additional tools or disassembly of pipelines for replacement. The size of the filter cover is adapted to the control pipe to keep it stable after installation without affecting the normal flow of water.This structural arrangement makes maintenance and replacement of the water-side filter more direct, effectively solving the common problem of blockage caused by impurities in the water after long-term operation of waste heat utilization equipment. This ensures the continuity of water circulation and heat exchange efficiency. The entire device integrates the flue gas purification structure and the waste heat utilization structure of the air heater into the same housing, allowing the flue gas duct, water circuit structure, and purification components to work collaboratively within a compact space. This not only reduces the complexity of piping connections required by traditional separate installations but also reduces the installation footprint. The drive mechanism uses a combination of an external motor and an eccentric wheel, enabling the filter structure to operate periodically, thus continuously maintaining the working state of the purification components. The multi-stage transmission structure between the drive mechanism and the filter components ensures smooth operation and facilitates maintenance personnel to inspect from the top. In the main structure, each major component is installed independently and modularly, allowing the flue gas-side filter unit, water-side filter unit, and drive mechanism to be disassembled and repaired individually, making it ideal for long-term continuous operation. The overall structure not only fully utilizes the waste heat from the flue gas but also effectively improves the service life and operational reliability of the device through its modular design.

[0022] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0023] During operation, flue gas enters through guide pipe 52, passes through operating pipe 51, and enters the air inlet 7. Cold water enters through control pipe 61, is filtered by filter cover 63, and then enters capillary tube 3 through water inlet main pipe 2. In capillary tube 3, it is heated by the flue gas and becomes hot water, which finally flows out through water outlet main pipe 4. Warm air is blown out through the downstream equipment of water outlet main pipe 4. Dust is filtered by filter plate 53. When filter plate 53 is fully loaded, drive motor 59 is turned on, which drives push rod 512 and sliding plate 513 to move up and down through eccentric wheel 510. Finally, it pushes contact rod 516 to move up and down. Contact rod 516 knocks on the surface of filter plate 53, causing dust to fall into the bottom of operating pipe 51. When the sliding plate 513 moves down, the return spring 514 at the top of the baffle 515 is squeezed. When the eccentric wheel 510 rotates upward, the return spring 514 pushes the sliding plate 513 up to reset. When separating the dust in the operating tube 51, rotate the screw 56 to separate the screw 56 from the positioning slot block 57 and the threaded slot block 55, pull down the waste plate 54 directly, and separate the waste plate 54 from the top sealing plate 58. Then pour out the dust on the top of the waste plate 54. When maintaining the filter cover 63, pull up the lifting ring 64 to separate the filter cover 63 from the inner wall of the control tube 61. Place the new filter cover 63 on the top of the ring plate 62 to complete the replacement. When the device is completely finished, restore the device.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste heat utilization device integrating boiler flue gas and a warm air heater, characterized in that, include: The shell (1) has a water inlet main pipe (2) at the top inside the shell (1), a capillary tube (3) at the bottom of the water inlet main pipe (2), a water outlet main pipe (4) at the bottom inside the shell (1), an air inlet hole (7) on the left side of the shell (1), and an air outlet hole (8) on the right side of the shell (1). A flue gas purification component (5) is provided, one side of which is connected to the left side of the housing (1). The flue gas purification component (5) is used to filter and remove boiler flue gas. The flue gas purification component (5) includes an operating pipe (51) connected to the left side of the housing (1). A guide pipe (52) is connected to the left side surface of the operating pipe (51). A filter plate (53) is fixedly connected to the inner wall of the operating pipe (51). Water filtration assembly (6), one side of which is connected to the left side of the housing (1), is used to filter residual hot water.

2. The integrated waste heat utilization device for boiler flue gas and air heater according to claim 1, characterized in that: The bottom of the operating tube (51) is movably connected to a waste plate (54), and a threaded groove block (55) is fixedly connected to the outer side of the surface of the waste plate (54). A screw (56) is threadedly connected to the inner wall of the threaded groove block (55), and a positioning groove block (57) is threadedly connected to the surface of the screw (56).

3. The integrated waste heat utilization device for boiler flue gas and air heater according to claim 1, characterized in that: The top of the operating tube (51) is fixedly connected to a top sealing plate (58), and the top of the top sealing plate (58) is fixedly connected to a drive motor (59) via a motor mount.

4. The integrated waste heat utilization device for boiler flue gas and air heater according to claim 3, characterized in that: One end of the output shaft of the drive motor (59) is fixedly connected to an eccentric wheel (510) via a coupling. A push plate (511) is movably connected to one side of the surface of the eccentric wheel (510), and a push rod (512) is fixedly connected to the bottom of the push plate (511).

5. The integrated waste heat utilization device for boiler flue gas and air heater according to claim 4, characterized in that: The bottom end of the push rod (512) is fixedly connected to a sliding plate (513), and the middle of the bottom of the sliding plate (513) is fixedly connected to a contact rod (516).

6. The integrated waste heat utilization device for boiler flue gas and air heater according to claim 5, characterized in that: A reset spring (514) is fixedly connected to the bottom of the sliding plate (513), and a baffle (515) is fixedly connected to the bottom end of the reset spring (514).

7. The integrated waste heat utilization device for boiler flue gas and air heater according to claim 1, characterized in that: The water filtration assembly (6) includes a control pipe (61) that communicates with the left side of the housing (1), and an annular plate (62) is fixedly connected to the inner wall of the control pipe (61).

8. The integrated waste heat utilization device for boiler flue gas and air heater according to claim 7, characterized in that: A filter cover (63) is fixedly connected to the top of the ring plate (62), and a lifting ring (64) is fixedly connected to the top of the filter cover (63).

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