Modular finned heat exchanger

Abstract

The utility model relates to heat exchanger technical field, modularization fin type heat exchanger includes heat preservation casing, heat preservation casing has the heat exchange cavity of hollow, the left end of heat preservation casing is equipped with cold air import, and the right end is equipped with hot air export, the front side of heat preservation casing is equipped with flue gas import, and the back side is equipped with flue gas export, and the back side of heat preservation casing is equipped with first flue gas chamber, and the front side is equipped with second flue gas chamber, heat preservation casing has first insertion port, second insertion port and third insertion port, is used for inserting first heat exchanger module, second heat exchanger module and third heat exchanger module respectively, the heat exchange pipe of first heat exchanger module is connected with first flue gas chamber at flue gas import, and the heat exchange pipe of second heat exchanger module is connected with first flue gas chamber at second flue gas chamber, and the heat exchange pipe of third heat exchanger module is connected with second flue gas chamber at flue gas export. The structure design is novel, under the condition that the channel of flue gas and air is independent, indirect heat exchange, realizes the purpose of easy cleaning and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically to a modular finned heat exchanger. Background Technology

[0002] Finned tube heat exchangers are widely used in the drying industry. A common working principle is as follows: hot air containing dust particles from a chain grate furnace enters the heat exchanger from the tail end. Inside the heat exchanger, it comes into direct contact with numerous pipes. Through heat exchange within the pipes, clean hot air is generated and drawn into the dryer by a fan to dry the clean material. The exhaust gas containing dust particles is cooled by heat exchange and, after dust removal to meet environmental protection requirements, is discharged into the air. An example of a drying equipment system disclosed in prior patent CN205878804U is shown. Some heat exchangers use flue gas entering the heat exchange tubes, while cold air passes through the cavities between the tubes to achieve heat exchange; an example is the finned heat exchanger disclosed in patent CN206974247U. After a period of use, dust particles in the flue gas will accumulate in the heat exchange tubes, ultimately affecting the heat exchange efficiency. This patent describes a ash collection hopper connected to an ash collection port below the finned tube heat exchanger. An ash discharge pipe is located at the lower end of the ash collection hopper, and a venting and ash discharge device is installed at the end of the ash discharge pipe. However, ash collection is only performed at the inlet, resulting in limited cleaning effectiveness, and dust and other impurities remain in the pipes. Utility Model Content

[0003] The purpose of this invention is to provide a modular finned heat exchanger to solve the problem of incomplete cleaning of dust and other impurities in heat exchange pipes.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A modular finned heat exchanger includes an insulated shell with a hollow heat exchange cavity. The insulated shell has a cold air inlet at its left end and a hot air outlet at its right end. A flue gas inlet is located on the front side of the insulated shell, and a flue gas outlet is located on the rear side, with the inlet and outlet alternately arranged. A first flue gas chamber is located on the rear side of the insulated shell, and a second flue gas chamber is located on the front side, with the flue gas inlet located to the right of the second flue gas chamber. The insulated shell has a first insertion port, a second insertion port, and a third insertion port arranged sequentially from right to left, for inserting a first heat exchanger module, a second heat exchanger module, and a third heat exchanger module from top to bottom, respectively. Each of the first, second, and third heat exchanger modules includes multiple heat exchange tubes extending in a front-to-back direction. The heat exchange tubes of the first heat exchanger module connect the flue gas inlet to the first flue gas chamber, the heat exchange tubes of the second heat exchanger module connect the second flue gas chamber to the first flue gas chamber, and the heat exchange tubes of the third heat exchanger module connect the flue gas outlet to the second flue gas chamber.

[0005] Furthermore, the first insertion port, the second insertion port, and the third insertion port are all rectangular openings, and the edges of the first insertion port, the second insertion port, and the third insertion port are provided with mating stepped surfaces, which are used to seal and fit with the first heat exchanger module, the second heat exchanger module, and the third heat exchanger module, respectively.

[0006] Furthermore, the first heat exchanger module, the second heat exchanger module, and the third heat exchanger module all include a front support plate and a rear support plate, with multiple heat exchange tubes provided between the front support plate and the rear support plate, and a cover plate provided on the upper side of the front support plate and the rear support plate, with an insulation layer provided on the cover plate.

[0007] Furthermore, a lifting ring is provided on the upper side of the cover plate.

[0008] Furthermore, the first insertion port, the second insertion port, and the third insertion port all have guide grooves arranged vertically.

[0009] Furthermore, the first heat exchanger module, the second heat exchanger module, and the third heat exchanger module are sealed to the corresponding guide groove wall through sealing gaskets.

[0010] Furthermore, the heat exchange tube is provided with fins on its outer periphery.

[0011] Furthermore, the fins are circular, and multiple circular fins are spaced apart along the length of the heat exchange tube.

[0012] The beneficial effects of this utility model are: The heat exchanger modules in this invention are modularly designed and inserted into the insulation shell. The heat exchange tubes of the first heat exchanger module connect the flue gas inlet to the first flue gas chamber, the heat exchange tubes of the second heat exchanger module connect the second flue gas chamber to the first flue gas chamber, and the heat exchange tubes of the third heat exchanger module connect the flue gas outlet to the second flue gas chamber. The flue gas can flow and return in a set direction, achieving multi-stage heat exchange with the air to be heated, thus improving the heat exchange effect. When cleaning and maintenance of the heat exchange tubes and the insulation shell 7 is required later, the heat exchanger modules can be hoisted and removed. The heat exchange tubes within the modules can then be cleaned individually, such as by blowing with compressed air. Simultaneously, after the heat exchanger modules are removed, the insulation shell has an opening at the top, providing operating space and facilitating more thorough cleaning. This modular finned heat exchanger has a novel structure, achieving easy cleaning and maintenance while ensuring independent and indirect heat exchange between the flue gas and air channels. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the modular finned heat exchanger of this utility model; Figure 2This utility model's modular finned heat exchanger is an empty shell structure without heat exchanger modules installed. Figure 3 This is a partial structure of the empty shell of the modular finned heat exchanger of this utility model without the heat exchanger module installed (showing the upper side plate of the flue gas chamber). Figure 4 This is a schematic diagram of the modular finned heat exchanger of this utility model being installed in the heat exchanger module; Figure 5 This is a 3D view of one of the heat exchanger modules; Figure 6 yes Figure 5 A partial view at point A in the image.

[0014] The names corresponding to each mark in the diagram: 11. Flue gas inlet; 12. Flue gas outlet; 21. Cold air inlet; 22. Hot air outlet; 31. First flue gas chamber; 32. Second flue gas chamber; 4. Guide groove; 51. First insertion port; 52. Second insertion port; 53. Third insertion port; 61. First heat exchanger module; 62. Second heat exchanger module; 63. Third heat exchanger module; 631. Lifting ring; 632. Cover plate; 633. Front support plate; 6331. Thickened part; 634. Rear support plate; 635. Heat exchange tube; 636. Fin; 7. Insulation shell. Detailed Implementation The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0015] Embodiments of this utility model: like Figures 1-6As shown, the modular finned heat exchanger includes an insulated shell 7 with a hollow heat exchange cavity. The left end of the insulated shell 7 has a cold air inlet 21, and the right end has a hot air outlet 22. The cold air inlet 21 is used to introduce air to be heated, while the air exiting from the right end is hot air after heat exchange in the heat exchanger, providing a heat source for drying materials in subsequent production processes. This is suitable for industries such as food processing, which require relatively clean hot air rather than directly utilizing flue gas. The front side of the insulated shell 7 has a flue gas inlet 11, and the rear side has a flue gas outlet 12, which are staggered. The flue gas inlet 11 is used to introduce high-temperature flue gas, approximately 700°C, which is cooled to over 100°C after passing through the heat exchanger and then undergoes environmental treatment. This invention focuses on optimizing the heat exchange structure; the connecting processes are not described and are considered existing technology. The air to be heated can be raised from approximately 20°C to approximately 400°C. The heated air and the flue gas do not come into direct contact; instead, they flow through their respective gas channels and exchange heat indirectly.

[0016] The insulation shell 7 adopts a sandwich structure, with steel plates on both sides and insulation cotton boards sandwiched between the steel plates. Using insulation measures on the outside of the equipment is also a common method in existing technology.

[0017] The insulation shell 7 has a first flue gas chamber 31 at the rear and a second flue gas chamber 32 at the front. The flue gas inlet 11 is located to the right of the second flue gas chamber 32. The flue gas outlet 12 is located to the left of the first flue gas chamber 31. The flue gas inlet and outlet are staggered, which gives the flue gas a bent flow effect and improves the heat exchange effect.

[0018] The insulation shell 7 has a first insertion port 51, a second insertion port 52, and a third insertion port 53 arranged sequentially from right to left, for inserting the first heat exchanger module 61, the second heat exchanger module 62, and the third heat exchanger module 63 from top to bottom, respectively. The modular design of the heat exchangers makes them easy to remove independently; for example, they can be lifted out separately for easy cleaning and maintenance, including cleaning of the inside of the heat exchange tubes 635 and the inside of the insulation shell 7.

[0019] The first heat exchanger module 61, the second heat exchanger module 62, and the third heat exchanger module 63 each include multiple heat exchange tubes 635 extending in a front-to-back direction. The heat exchange tubes 635 of the first heat exchanger module 61 connect the flue gas inlet 11 to the first flue gas chamber 31; the heat exchange tubes 635 of the second heat exchanger module 62 connect the second flue gas chamber 32 to the first flue gas chamber 31; and the heat exchange tubes 635 of the third heat exchanger module 63 connect the flue gas outlet 12 to the second flue gas chamber 32. The flow direction of the flue gas and the air to be heated is shown in [reference needed]. Figure 1 .

[0020] The first insertion port 51, the second insertion port 52, and the third insertion port 53 are all rectangular openings. The lengths of the first insertion port 51, the second insertion port 52, and the third insertion port 53 decrease sequentially to form a gradient, thereby achieving multi-stage heat exchange.

[0021] Figure 5 and 6 As shown, the first heat exchanger module 61, the second heat exchanger module 62, and the third heat exchanger module 63 all include a front support plate 633 and a rear support plate 634. Multiple heat exchange tubes 635 are arranged between the front support plate 633 and the rear support plate 634. A cover plate 632 with an insulation layer is provided on the upper side of the front support plate 633 and the rear support plate 634. The length and width of the first heat exchanger module 61, the second heat exchanger module 62, and the third heat exchanger module 63 are adapted to the size of the corresponding insertion port. The structure and principle of each heat exchanger module are the same, only the dimensions differ. Each heat exchanger module includes several rows and columns of heat exchange tubes 635, allowing flue gas to flow along each tube in the front-to-back direction, while heated air flows from left to right in the intervals between adjacent rows of heat exchange tubes 635.

[0022] The heat exchange tube 635 has fins 636 on its outer periphery. The fins 636 are circular, and multiple circular fins are spaced apart along the length of the heat exchange tube 635 to improve the heat exchange effect. In other embodiments, spiral fins may also be used.

[0023] Figure 3 As shown, the edges of the first insertion port 51, the second insertion port 52, and the third insertion port 53 are all provided with mating stepped surfaces, which are used to seal with the first heat exchanger module 61, the second heat exchanger module 62, and the third heat exchanger module 63, respectively. After each heat exchanger module is installed, the edge of the cover plate 632 of the heat exchanger module is pressed against the mating stepped surface, and there is a high-temperature resistant sealing gasket between them to prevent gas from escaping.

[0024] Figure 2 As shown, the first insertion port 51, the second insertion port 52, and the third insertion port 53 all have vertically arranged guide grooves 4 formed by the column, and the aforementioned mating stepped surfaces are formed on the crossbeam located at the upper end of the column. The first heat exchanger module 61, the second heat exchanger module 62, and the third heat exchanger module 63 are sealed to the corresponding guide groove walls through sealing gaskets. That is, after the heat exchanger modules are inserted into place from top to bottom, the left and right ends of the cover plate 632, the front support plate 633, and the rear support plate 634 can all achieve a sealed fit, preventing the flue gas and heated air from escaping and also avoiding their mixing (the flow channels of the two are independent).

[0025] The front or rear edges of the front support plate 633 and the rear support plate 634 are thickened portions 6331. The area inside where the heat exchange tube 635 connects can be slightly thinner while still meeting the required support strength, thus reducing the overall material usage and weight. The thickened portions 6331 facilitate a tight seal.

[0026] Figure 4 and 5 As shown, a lifting ring 631 is provided on the upper side of the cover plate 632. When cleaning and maintenance of the heat exchanger tubes 635 and the insulation shell 7 is required later, the heat exchanger module can be lifted and removed. The heat exchanger tubes 635 within the heat exchanger module can then be cleaned separately, for example, by blowing with compressed air. Simultaneously, the insulation shell 7 has an open upper section, facilitating internal cleaning. The lifting ring 631 is convenient for use with lifting devices such as ropes and hooks.

Claims

1. A modular finned heat exchanger, characterized in that: The device includes an insulated shell with a hollow heat exchange chamber. A cold air inlet is located at the left end of the shell, and a hot air outlet at the right end. A flue gas inlet is located at the front, and a flue gas outlet is located at the rear, with the inlets and outlets staggered. A first flue gas chamber is located at the rear, and a second flue gas chamber is located at the front, with the flue gas inlet located to the right of the second flue gas chamber. The shell has a first insertion port, a second insertion port, and a third insertion port arranged sequentially from right to left, for inserting a first heat exchanger module, a second heat exchanger module, and a third heat exchanger module from top to bottom, respectively. Each of the first, second, and third heat exchanger modules includes multiple heat exchange tubes extending in a front-to-back direction. The heat exchange tubes of the first heat exchanger module connect the flue gas inlet to the first flue gas chamber, the heat exchange tubes of the second heat exchanger module connect the second flue gas chamber to the first flue gas chamber, and the heat exchange tubes of the third heat exchanger module connect the flue gas outlet to the second flue gas chamber.

2. The modular finned heat exchanger according to claim 1, characterized in that: The first insertion port, the second insertion port, and the third insertion port are all rectangular openings. The edges of the first insertion port, the second insertion port, and the third insertion port are provided with mating stepped surfaces, which are used to seal with the first heat exchanger module, the second heat exchanger module, and the third heat exchanger module, respectively.

3. The modular finned heat exchanger according to claim 2, characterized in that: The first heat exchanger module, the second heat exchanger module, and the third heat exchanger module all include a front support plate and a rear support plate. Multiple heat exchange tubes are provided between the front support plate and the rear support plate. A cover plate is provided on the upper side of the front support plate and the rear support plate, and the cover plate is provided with a heat insulation layer.

4. The modular finned heat exchanger according to claim 3, characterized in that: The cover plate is provided with a lifting ring on its upper side.

5. The modular finned heat exchanger according to claim 3, characterized in that: The first insertion port, the second insertion port and the third insertion port all have guide grooves arranged vertically.

6. The modular finned heat exchanger according to claim 5, characterized in that: The first heat exchanger module, the second heat exchanger module, and the third heat exchanger module are sealed to the corresponding guide groove wall through sealing gaskets.

7. The modular finned heat exchanger according to claim 1, characterized in that: The heat exchange tube is provided with fins on its outer periphery.

8. The modular finned heat exchanger according to claim 7, characterized in that: The fins are circular, and multiple circular fins are spaced apart along the length of the heat exchange tube.

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