Sectional type flue gas heat exchange device

Abstract

The utility model discloses a sectional type flue gas heat exchange device which comprises a heat exchange shell, a heat transfer water tank, heat exchange liquid temporary storage heat preservation boxes, a heat exchange plate, a heat exchange liquid transfer mechanism, a heat insulation vacuum cavity, a high-temperature-resistant circulation pump and a thermometer, the heat transfer water tank is arranged outside the heat exchange shell, and the heat exchange liquid temporary storage heat preservation boxes are arranged on the upper portion and the lower portion of the outer portion of the heat transfer water tank. A heat exchange plate is arranged in the heat exchange shell, a heat exchange liquid transfer mechanism is arranged between the heat transfer water tank and the heat exchange liquid temporary storage heat preservation box, a heat insulation vacuum cavity is formed in the wall of the heat exchange shell, a high-temperature-resistant circulating pump is arranged in the heat transfer water tank, and a thermometer is arranged on the rear side of the outer portion of the heat transfer water tank. Compared with the prior art, the utility model has the advantages that the uniform temperature difference is ensured, and the heat in the flue gas is utilized more uniformly and fully.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas heat exchange, in particular to a segmented flue gas heat exchange device. Background Art

[0002] Heat exchange is a process that uses the heat of a high-temperature medium to heat a low-temperature medium. Heat exchangers typically utilize heat exchange tubes, which offer excellent thermal conductivity and can quickly transfer heat to the cooling medium. Heat exchangers are used in many fields, including kitchen appliances. During cooking, stoves generate a large amount of high-heat flue gas. This high-heat flue gas is typically used to heat cooling water, which can then be reused.

[0003] According to Fourier's law, the heat transfer rate is proportional to the temperature difference. That is, under the same conditions, the greater the temperature difference, the higher the heat transfer rate. Heat transfer efficiency is related to the temperature difference; the greater the temperature difference, the higher the heat transfer rate. However, as the temperature difference increases, the gradient of heat transfer also changes. Therefore, the heat exchange between flue gas and water must be within a certain temperature difference range to reduce heat loss in the flue gas, increase heat recovery in the flue gas, and ensure heat transfer efficiency.

[0004] A flue gas heat exchange device, described in announcement number CN219810311U, comprises a housing, a water tank, and a heat exchange structure; a flue gas passage is provided within the housing; a plurality of water tanks are symmetrically mounted on the side walls of the housing and located on both sides of the flue gas passage, with the housings connected via the heat exchange structure; the heat exchange structure comprises a plurality of heat exchange tubes located within the flue gas passage, and configured to increase the contact area and / or the contact time between the flue gas and the heat exchange tubes. By integrating the water tank and the heat exchange device within the housing, the present invention rationally utilizes the interior space of the housing, allowing the heat in the flue gas to be effectively absorbed within the housing, thereby simplifying the manufacturing process and facilitating cost savings; and by using finned heat exchange tubes, the present invention increases the contact area with the flue gas during the heat exchange process, thereby improving heat exchange efficiency.

[0005] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0006] Although the above flue gas heat exchange device solves certain problems, it still has the following disadvantages:

[0007] The flue gas heat exchange device is a single-end contact heat exchanger. The temperature difference between the water and the flue gas inside the heat exchanger is large at the beginning, and the temperature difference gradually increases as the internal water absorbs heat, and the temperature difference gradually decreases. The temperature difference between the water and the flue gas does not have a uniform range, which easily leads to heat loss in the flue gas and insufficient heat utilization of the flue gas. Utility Model Content

[0008] The purpose of the utility model is to provide a segmented flue gas heat exchange device.

[0009] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] A segmented flue gas heat exchange device, comprising:

[0011] A plurality of evenly distributed and stacked heat exchange shells are connected by external upper and lower fixed flanges, and an insulating vacuum cavity is opened in the inner side wall of the heat exchange shell;

[0012] A heat transfer tank, the heat transfer tank being fixedly connected to the middle portion of the exterior of the heat exchange shell, a high-temperature resistant circulation pump being fixedly connected to the front end of the interior of the heat transfer tank, a thermometer being fixedly connected to the exterior of the heat transfer tank, and a linkage central controller being fixedly connected to the front end of the exterior of the heat transfer tank, first water holes being opened on the upper and lower sides of one side of the exterior of the heat transfer tank, and the temperature of the water inside the heat transfer tank gradually increasing from top to bottom;

[0013] A heat exchange liquid temporary storage and insulation box is sleeved on the upper and lower sides of the exterior of the heat exchange shell, the heat exchange liquid temporary storage and insulation box is fixedly connected to the exterior of the heat transfer tank, and a second water hole is opened on the upper and lower sides of the exterior of the heat exchange liquid temporary storage and insulation box near the first water hole;

[0014] Heat exchange plates, wherein the heat exchange plates are evenly distributed inside the heat exchange shell, and the heat exchange plates are fixedly connected to a number of evenly distributed heat-conducting columns around the outside. A heat spreader is provided on one side of the heat transfer tank close to the heat exchange plates, and the heat-conducting columns are connected to the other end of the heat exchange plates and fixedly connected to the side of the heat spreader close to the heat exchange shell;

[0015] The heat exchange liquid transfer mechanism is arranged between the heat transfer water tank and the heat exchange liquid temporary storage and insulation tank.

[0016] Furthermore, the cross-section of the middle portion of the heat exchange shell is square, and the upper and lower ends of the exterior of the heat exchange shell are circular.

[0017] Furthermore, the probe at the front end of the thermometer extends into the interior of the heat transfer tank.

[0018] Furthermore, the temperature of the heat exchange liquid inside the upper heat exchange liquid temporary storage and insulation box is low, and the temperature of the heat exchange liquid inside the lower heat exchange liquid temporary storage and insulation box is high.

[0019] Furthermore, the heat exchange fluid transfer mechanism includes:

[0020] Transfer pipes, wherein the transfer pipes are evenly distributed on one side of the heat transfer water tank where the first water hole is provided;

[0021] A delivery control valve is provided on the delivery pipe.

[0022] Furthermore, the interior of the transfer pipe and the connected heat transfer water tank are connected to the interior of the heat exchange liquid temporary storage and insulation box.

[0023] Furthermore, the heat transfer water tank is connected to the upper and lower heat exchange liquid temporary storage and insulation boxes through the interior of the transfer pipe, and the interiors of the adjacent heat exchange liquid temporary storage and insulation boxes between the upper and lower heat exchange shells are also connected through the interior of the transfer pipe.

[0024] The utility model provides a segmented flue gas heat exchange device, which has the following beneficial effects:

[0025] Through the multi-stage heat exchange shell and heat transfer water tank, the upper and lower heat exchange liquid temporary storage and insulation boxes are used to temporarily store and transport the flowing heat exchange liquid, so that the temperature of the heat exchange liquid gradually increases from top to bottom. The water temperature is high at the bottom of the flue gas. As heat is lost and heat is absorbed by other media and heat is transferred to the water, the flue gas temperature above is low, so that the heat-absorbing water can have a high temperature in the lower heat exchange section and a low temperature in the upper heat exchange section, ensuring a uniform temperature difference and making more balanced and full use of the heat inside the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only exemplary, and those skilled in the art can also derive other implementation drawings based on the provided drawings without inventive effort.

[0027] Figure 1 This utility model is a three-dimensional splicing of a segmented flue gas heat exchange device Figure 1 .

[0028] Figure 2 This utility model is a three-dimensional splicing of a segmented flue gas heat exchange device Figure 2 .

[0029] Figure 3 This is a three-dimensional single heat exchange shell of a segmented flue gas heat exchange device. Figure 1 .

[0030] Figure 4 This is a three-dimensional single heat exchange shell of a segmented flue gas heat exchange device. Figure 2 .

[0031] Figure 5 This is a three-dimensional structure of the splicing part of a segmented flue gas heat exchange device of the utility model. Figure 1 .

[0032] Figure 6 This is a three-dimensional structure of the splicing part of a segmented flue gas heat exchange device of the utility model. Figure 2 .

[0033] Figure 7 This is a cross-sectional view of a single heat exchange shell of a segmented flue gas heat exchange device of the present invention.

[0034] Indications in the figure: 1. Heat exchange shell; 2. Heat transfer water tank; 3. Temporary heat exchange liquid storage insulation box; 4. Heat exchange plate; 5. Heat exchange liquid transfer mechanism; 501. Transfer pipe; 502. Delivery control valve; 6. Flange; 7. Insulated vacuum chamber; 8. High-temperature resistant circulation pump; 9. Thermometer; 10. Interlocking central controller; 11. First water hole; 12. Second water hole; 13. Heat conduction column; 14. Heat spreader. DETAILED DESCRIPTION

[0035] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present disclosure. Rather, they are merely examples of devices consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0036] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] Example 1:

[0038] like Figures 1 to 7 As shown, this embodiment proposes a segmented flue gas heat exchange device, including a heat exchange shell 1, a heat transfer water tank 2, a heat exchange liquid temporary storage insulation box 3, a heat exchange plate 4, a heat exchange liquid transfer mechanism 5, a flange 6, an insulating vacuum chamber 7, a high-temperature resistant circulation pump 8 and a thermometer 9 arranged on the front side of the outside of the heat transfer water tank 2.

[0039] Among them, the heat exchange shell 1 is square in the middle, with a square bottom that is inward-contracted at the top and bottom and a round table-shaped top. A heat transfer tank 2 is arranged on the outside of the heat exchange shell 1. The heat transfer tank 2 is in the middle of the outside of the heat exchange shell 1. The inner side wall of the heat exchange shell 1 is a layer of vacuum insulation vacuum cavity 7 (the inner side can also be filled with insulation material to achieve the same effect). The temperature loss caused by heat transfer of the flue gas circulating inside the heat exchange shell 1 is reduced. A high-temperature resistant circulation pump 8 is arranged at the front end of the inner part of the heat transfer tank 2. By pumping, the water inside the heat transfer tank 2 used to absorb the heat of the flue gas inside the heat exchange shell 1 is transported and flowed, so that the water inside the heat transfer tank 2 flows, reducing the boundary layer thickness of the heat transfer tank 2 close to the side of the heat exchange shell 1, and allowing the internal water flow to flow, thereby increasing the uniformity of the internal water flow heat absorption and ensuring a certain heat absorption efficiency. The segmented heat exchange shell 1 is butt-sealed by upper and lower flanges 6, and insulation treatment is required at the connection position of the flange 6.

[0040] Two heat exchange liquid temporary storage and insulation boxes 3 are set outside the heat exchange shell 1. The heat exchange liquid temporary storage and insulation boxes 3 are respectively located above and below the outside of the heat transfer tank 2. The upper heat exchange liquid temporary storage and insulation box 3 is used to store the hot water to be exchanged at a lower temperature, and the lower heat exchange liquid temporary storage and insulation box 3 is used to store the hot water to be exchanged at a higher temperature. Both have the function of heat preservation to avoid heat loss caused by heat exchange with the outside world. The low-temperature exchange water on the upper side flows downward, allowing the hot water inside the heat transfer tank 2 from top to bottom to gradually heat up. In conjunction with the flow of flue gas from bottom to top, the internal temperature of the heat transfer tank 2 on the lower side is high, and the internal temperature of the heat transfer tank 2 on the upper side is low, reducing the temperature difference between the heat transfer tank 2 and the heat exchange shell 1, and the internal flue gas. According to Fourier's law, the heat transfer rate is proportional to the temperature difference, that is, under the same conditions, the greater the temperature difference, the higher the heat transfer rate, but it will also cause the system How to increase the loss, so the bigger the temperature difference is not necessarily better, and a reasonable balance point needs to be found. In this application, the temperature difference between the flue gas and the hot water inside the heat transfer tank 2 is removed from the flue gas emission ends, so that the average temperature difference between the flue gas and the hot water inside the heat transfer tank 2 is controlled within a range of 50°C to 120°C (this application takes 50°C to 120°C as an example, and the specific temperature difference control range needs to be determined according to the specific flue gas temperature, local water quality, heat exchange medium, manufacturing materials, etc.) to ensure a certain heat transfer efficiency. The accuracy of temperature difference control can be increased by adding heat exchange sections (the two sections drawn in the figure are only for reference, and there are actually more than two sections).

[0041] The formula for calculating the logarithmic mean temperature difference is: Among them, ΔT1 and ΔT2 are the temperature difference k between the flue gas inlet and the flue gas outlet respectively. The heat transfer rate is calculated as: Q = UAΔT LMTD , where Q is the total heat transfer rate (W), and U is the total heat transfer coefficient (W / (m2 .K)), A is the heat transfer area (m 2 ), ΔT LMTD is the log mean temperature difference (K).

[0042] In order to make the temperature of the heated water higher from top to bottom, a heat exchange liquid temporary storage insulation tank 3 is needed to temporarily store and insulate the water heated inside the heat exchange water tank 2, and when the water inside the heat exchange water tank 2 absorbs heat and reaches the temperature specified by the corresponding heat exchange section, the water inside the heat exchange water tank 2 must flow to the heat exchange water tank 2 on the lower side. However, the heating time of the water is not necessarily the same in different heat exchange stages, so it is necessary to set heat exchange liquid temporary storage insulation tanks 3 above and below the heat exchange water tank 2. In order to allow water flow to be transferred between the heat exchange liquid temporary storage insulation tank 3 and the heat exchange water tank 2, and water to circulate between the heat exchange liquid temporary storage insulation tank 3 on the lower side of the adjacent heat exchange section and the heat exchange liquid temporary storage insulation tank 3 on the upper side of the next section, first water holes 11 are opened on the upper and lower sides of the outer side of the heat exchange water tank 2. A second water hole 12 is provided on the upper and lower sides of one side of the first water hole 11 on the outside of the insulation box 3. A transfer pipe 501 is passed between the first water hole 11 on the upper side and the second water hole 12 on the lower side of the upper heat exchange liquid temporary storage insulation box 3. A delivery control valve 502 is provided on the delivery pipe 501. The delivery control valve 502 is used to control the opening and closing of the transfer pipe 501. The first water hole 11 on the lower side of the heat transfer water tank 2 and the second water hole 12 on the upper side of the lower heat exchange liquid temporary storage insulation box 3 are also transported through the transfer pipe 501 and the delivery control valve 502. In addition, the heat exchange sections of adjacent stages, the heat exchange liquid temporary storage insulation box 3 on the lower side of the upper heat exchange section and the heat exchange liquid temporary storage insulation box 3 on the upper side of the lower heat exchange section, are also transferred through the heat exchange liquid transfer mechanism 5.

[0043] The middle of the heat exchange shell 1 is square, and the area in contact with the flue gas is larger than that of the circular shell. The ratio of the square contact area to the circular contact area is approximately 4R:3.14R, and the upper and lower ends are closed. When the heat exchange section is connected, it can hinder the circulation of the flue gas, increase the contact time between the flue gas and the several evenly distributed heat exchange plates 4 arranged inside the heat exchange shell 1, and adopt plate heat exchange to increase the contact surface and heat exchange efficiency. Several evenly distributed heat-conducting columns 13 are fixedly connected to the outside of the heat exchange plate 4. A heat spreader 14 is set on all four sides of the side of the inside of the heat transfer water tank 2 close to the heat exchange shell 1. The heat spreader 14 is fixedly connected to the heat-conducting columns 13 on the side close to the heat exchange shell 1. Through the contact between the heat exchange plate 4 and the flue gas, the heat-conducting columns 13 and the heat spreader 14 are used to transfer heat to the water inside the heat transfer water tank 2.

[0044] The heat transfer tank 2 in the bottom heat exchange section is in contact with the high-temperature flue gas that has just come out for heat exchange, so the heat transfer tank 2 can be continuously heated, and the generated water vapor can also be used, or the heated water can be stored or discharged downward for collection for later use. A thermometer 9 with a probe extending into its interior is fixedly connected to the rear end of the outside of the heat transfer tank 2, and a linkage central controller 10 is fixedly connected to the front end of the outside of the heat transfer tank 2 for controlling the corresponding delivery control valve 502 according to the temperature threshold set by the thermometer 9 on the corresponding heat exchange section. The temperature threshold set by the thermometer 9 gradually increases from top to bottom.

[0045] The electrical components appearing in this article are all connected to an external main controller and 220V AC power, and the main controller can be a conventional known device that controls a computer, etc. The specific implementation method of this disclosure omits the detailed description of known functions and known components. To ensure the compatibility of the equipment, the operating methods used are consistent with the parameters of marketed equipment.

[0046] The thermometer 9, the linkage central controller 10 and the delivery control valve 502 are all existing products on the market. Their connection methods and control methods are all existing technologies and will not be described in detail here.

[0047] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections, indirect connections through an intermediate medium, or internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A segmented flue gas heat exchange device, characterized in that: include: A plurality of heat exchange shells (1) are evenly distributed and stacked up and down, the heat exchange shells (1) are connected by external flanges (6) fixedly connected up and down, and a heat-insulating vacuum cavity (7) is provided in the inner side wall of the heat exchange shell (1); A heat transfer tank (2), the heat transfer tank (2) being fixedly connected to the middle portion of the exterior of the heat exchange shell (1), a high-temperature resistant circulation pump (8) being fixedly connected to the front end of the interior of the heat transfer tank (2), a thermometer (9) being fixedly connected to the exterior of the heat transfer tank (2), a linkage central controller (10) being fixedly connected to the front end of the exterior of the heat transfer tank (2), first water holes (11) being provided on the upper and lower sides of one side of the exterior of the heat transfer tank (2), and the temperature of the water in the heat transfer tank (2) gradually increasing from top to bottom; A heat exchange liquid temporary storage and insulation box (3), the heat exchange liquid temporary storage and insulation box (3) is sleeved on the upper and lower sides of the exterior of the heat exchange shell (1), the heat exchange liquid temporary storage and insulation box (3) and the exterior of the heat transfer water tank (2) are fixedly connected on the upper and lower sides, and a second water through hole (12) is provided on the upper and lower sides of the exterior of the heat exchange liquid temporary storage and insulation box (3) near the first water through hole (11); A heat exchange plate (4), wherein a plurality of heat exchange plates (4) are evenly distributed and arranged inside the heat exchange shell (1), a plurality of evenly distributed heat conducting columns (13) are fixedly connected to the periphery of the outside of the heat exchange plate (4), a heat spreader (14) is provided on one side of the inside of the heat transfer tank (2) close to the heat exchange plate (4), and the heat conducting columns (13) are connected to the other end of the heat exchange plate (4) and fixedly connected to the side of the heat spreader (14) close to the heat exchange shell (1); A heat exchange liquid transfer mechanism (5) is provided between the heat transfer water tank (2) and the heat exchange liquid temporary storage and insulation tank (3).

2. The segmented flue gas heat exchange device according to claim 1, characterized in that: The middle cross-section of the heat exchange shell (1) is square, and the upper and lower ends of the exterior of the heat exchange shell (1) are circular.

3. The segmented flue gas heat exchange device according to claim 1, characterized in that: The probe at the front end of the thermometer (9) extends into the interior of the heat transfer tank (2).

4. The segmented flue gas heat exchange device according to claim 1, characterized in that: The temperature of the heat exchange liquid inside the upper heat exchange liquid temporary storage and insulation box (3) is low, and the temperature of the heat exchange liquid inside the lower heat exchange liquid temporary storage and insulation box (3) is high.

5. The segmented flue gas heat exchange device according to claim 1, characterized in that: The heat exchange fluid transfer mechanism (5) comprises: Transfer pipes (501), wherein a plurality of transfer pipes (501) are evenly distributed and arranged on one side of the heat transfer water tank (2) where the first water hole (11) is opened; The delivery control valve (502) is provided on the delivery pipe (501).

6. The segmented flue gas heat exchange device according to claim 5, characterized in that: The interior of the transfer pipe (501) and the connected heat transfer water tank (2) are connected to the interior of the heat exchange liquid temporary storage and insulation tank (3).

7. The segmented flue gas heat exchange device according to claim 5, characterized in that: The heat transfer water tank (2) is connected to the interiors of the upper and lower heat exchange liquid temporary storage and insulation boxes (3) via the interiors of the transfer pipe (501), and the interiors of the adjacent heat exchange liquid temporary storage and insulation boxes (3) between the upper and lower heat exchange shells (1) are also connected via the interiors of the transfer pipe (501).

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