A heat exchange device for flue gas waste heat recovery

Abstract

A heat exchange device for flue gas waste heat recovery relates to the field of heat exchange equipment technology. This device improves the natural gas waste gas flow channel and the liquid medium flow channel to be heated by modifying the heat exchange plates, thereby increasing the disturbance to the waste gas and liquid medium and making the heat exchange more complete. It includes several fixedly arranged heat exchange plate groups, each heat exchange plate group including two heat exchange plates that are attached together. Several arc-shaped protrusions are provided on the opposite side of the two heat exchange plates, and the liquid channel is formed by the relative positions of the arc-shaped protrusions on the opposite side of the two heat exchange plates.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment technology, specifically to a heat exchange device for flue gas waste heat recovery. Background Technology

[0002] The flue gas temperature of gas-fired boilers is typically between 80 and 150°C, and the flue gas contains a large amount of water vapor (approximately 18%), indicating significant waste heat potential. Recovering waste heat from flue gas is beneficial for improving energy utilization efficiency and reducing energy consumption. Welded plate heat exchangers are widely used in flue gas waste heat recovery due to their advantages such as high heat exchange efficiency and compact structure. The structural design of their core heat transfer component, the heat exchange plates, directly affects the waste heat recovery performance and system stability.

[0003] The heat exchange plates of existing plate heat exchangers have the following shortcomings: 1. In pursuit of lightweight design, the plate thickness is usually only 0.4mm to 0.8mm. The heat exchange plates themselves have low strength and are prone to deformation and cracking under long-term pressure impact, which may affect the stable operation of the system; 2. The flow channel structure on the surface of the heat exchange plates does not adequately disturb the flue gas, so the heat transfer coefficient cannot be further improved and the heat transfer is insufficient. Utility Model Content

[0004] I. Technical problems to be solved

[0005] This invention addresses the shortcomings of existing technologies by proposing a heat exchange device for flue gas waste heat recovery. By improving the natural gas exhaust flow channel and the liquid medium flow channel for waste heat recovery in the heat exchange plates, the disturbance to the exhaust gas and liquid medium is enhanced, resulting in more thorough heat exchange.

[0006] II. Specific Technical Solutions

[0007] A heat exchange device for recovering waste heat from flue gas includes several fixedly arranged heat exchange plate groups. Each heat exchange plate group includes two heat exchange plates that are attached together. Several arc-shaped protrusions are provided on the opposite side of the two heat exchange plates. On the opposite side of the two heat exchange plates, the arc-shaped protrusions are attached to each other to form a liquid channel.

[0008] Implementation principle and working principle:

[0009] In this design, the corrugated arc-shaped protrusions serve as the flow channels for exhaust gas, allowing the exhaust gas to remain in the channels for a longer period of time. The other side of the arc-shaped protrusions, when joined together, forms a liquid flow channel with a slower flow rate and a larger contact area with the heat exchange plates, resulting in better heat exchange performance.

[0010] Preferably, a plurality of connecting protrusions are provided between adjacent arc-shaped protrusions; the two ends of the connecting protrusions are respectively connected to the corresponding arc-shaped protrusions; the height of the connecting protrusions is lower than the height of the arc-shaped protrusions; the beneficial effect of this preferred embodiment is that by setting the connecting protrusions, the arc-shaped protrusions can be supported, thereby strengthening the structural strength of the heat exchange plates; at the same time, the connecting protrusions can also serve as tributaries in each liquid flow channel, further promoting the disturbance of the liquid medium, increasing the contact area between the liquid and the exhaust gas, and resulting in better heat exchange effect.

[0011] Preferably, the connecting protrusions are arranged parallel to each other between adjacent arc-shaped protrusions, and the connecting protrusions are inclined at an angle of 10°-90°. The advantage of this preferred arrangement is that by inclining the connecting protrusions, the structural strength and heat exchange area can be further improved, which is beneficial to improving the heat exchange effect.

[0012] Preferably, each of the arc-shaped protrusions is provided with a plurality of guide grooves; the plurality of guide grooves are inclined and opposite to the inclination direction of the connecting protrusions; the two ends of the guide grooves respectively conduct the gap between the arc-shaped protrusions; the beneficial effects of this preferred embodiment are: the provision of guide grooves can avoid stress concentration on the arc-shaped protrusions, can improve the strength of the heating plate, and facilitate the discharge of condensate precipitated during exhaust gas cooling.

[0013] Preferably, the height of the arc-shaped protrusion is 3-10mm, and the height of the connecting protrusion is 1.5-3mm. In this preferred configuration, the parameter settings of the protrusion effectively take into account both the strength of the heat exchange plate and ensure the heat transfer effect.

[0014] Preferably, the cross-section of the arc-shaped protrusion is trapezoidal.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. This solution transforms the original straight gas and liquid flow channels for heat exchange into corrugated arc-shaped channels, which better facilitates the turbulence of the heat exchange medium and improves the heat exchange effect.

[0017] 2. The inclined connecting protrusions and the several guide grooves on the arc-shaped protrusions can strengthen the structure of the heat exchange plates and facilitate the precipitation of condensate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the heat exchange plates of the heat exchange device for flue gas waste heat recovery according to this utility model.

[0019] Figure 2 This is a schematic diagram of the heat exchange plate assembly structure of the heat exchange device for flue gas waste heat recovery according to this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Heat exchange plate assembly, 2. Heat exchange plate, 3. Arc-shaped protrusion, 4. Liquid channel, 5. Connecting protrusion, 6. Guide groove, 7. Waste gas channel. Detailed Implementation

[0022] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings, so that the advantages and features of this utility model can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0023] like Figure 1-2 As shown:

[0024] A heat exchange device for flue gas waste heat recovery includes several fixedly arranged heat exchange plate groups 1, wherein the heat exchange plate groups 1 are attached and fixed to each other; wherein the heat exchange plate group 1 is mainly composed of two heat exchange plates 2 that are attached together, wherein each heat exchange plate 2 has several arc-shaped protrusions 3 on its back side, wherein the arc-shaped protrusions 3 are wavy and the cross-section of the arc-shaped protrusions 3 is trapezoidal, and is specifically formed by directly stamping on the heat exchange plate 2; the two heat exchange plates 2 are attached to opposite sides; wherein, during attachment, the corresponding positions on the other side of the heat exchange plate 2, i.e. the opposite side of the arc-shaped protrusions 3, are attached to form a liquid channel 4; wherein, after the several heat exchange plate groups 1 are attached together, the interval between the arc-shaped protrusions 3 is a flue gas passage.

[0025] In implementation, several connecting protrusions 5 are provided between adjacent arc-shaped protrusions 3. The connecting protrusions 5 are arranged parallel to each other between adjacent arc-shaped protrusions 3, and all connecting protrusions 5 are inclined, with an inclination angle of 10°-90°. The two ends of the connecting protrusions 5 are connected to the upper and lower arc-shaped protrusions 3 respectively. In implementation, the connecting protrusions 5 and the arc-shaped protrusions 3 are also integrally stamped. The height of the connecting protrusions 5 is lower than the height of the arc-shaped protrusions 2. By setting the connecting protrusions 5, they can provide support for the arc-shaped protrusions 3 and strengthen the structural strength of the heat exchange plate 1. At the same time, the connecting protrusions 5 can also serve as branches in each liquid flow channel, further promoting the disturbance of the liquid medium, increasing the contact area and contact time between the liquid and the exhaust gas, and improving the heat exchange effect. In particular, the inclined setting of the connecting protrusions 5 can further improve the structural strength and heat exchange area, which is beneficial to improving the heat exchange effect.

[0026] In specific implementation, several guide grooves 6 are provided on each arc-shaped protrusion 3, and the guide grooves 6 are at least inclinedly arranged at the top and bottom of the arc-shaped protrusion 3; and all guide grooves 6 are in the opposite direction of inclination to the connecting protrusion 5; and the two ends of the guide grooves 6 respectively connect the gaps between the arc-shaped protrusions 3; in implementation, the setting of the guide grooves 6 can avoid stress concentration on the arc-shaped protrusions 3, improve the strength of the heating plate, and facilitate the discharge of condensate precipitated during exhaust gas cooling.

[0027] During implementation, the height of the arc-shaped protrusion 3 is 3-10mm, and the height of the connecting protrusion 5 is 1.5-3mm. The parameter settings of the arc-shaped protrusion 3 and the connecting protrusion effectively ensure the strength of the heat exchange plate 2 and also ensure the heat transfer effect.

[0028] In this specific implementation, several heat exchange plates are first assembled, and the liquid to be heated is introduced into one side of two heat exchange plates 2 facing each other; the exhaust gas is introduced into the exhaust gas flow channel 7 formed between the corrugated arc protrusions 3, so that the exhaust gas can stay in the flow channel for a longer time; the other side of the arc protrusions 3 is spliced ​​to form a liquid flow channel 4, which can make the liquid flow rate slower, the contact surface with the heat exchange plates 2 larger, and the heat exchange effect better.

[0029] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims.

Claims

1. A heat exchange device for flue gas waste heat recovery, comprising a plurality of fixedly arranged heat exchange plate groups (1), wherein each heat exchange plate group (1) comprises two heat exchange plates (2) that are bonded together, characterized in that: Several arc-shaped protrusions (3) are provided on the opposite side of the two heat exchange plates (2). On the opposite side of the two heat exchange plates (2), the arc-shaped protrusions (3) are attached to each other to form a liquid channel (4). Several connecting protrusions (5) are provided between adjacent arc-shaped protrusions (3). The two ends of the connecting protrusions (5) are respectively connected to the corresponding arc-shaped protrusions (3). The height of the connecting protrusions (5) is lower than the height of the arc-shaped protrusions (3).

2. The heat exchanger for flue gas waste heat recovery according to claim 1, characterized in that: Several of the connecting protrusions (5) are arranged parallel to each other between adjacent arc-shaped protrusions (3), and the connecting protrusions (5) are inclined, with an inclination angle of 10°-90°.

3. The heat exchange device for flue gas waste heat recovery according to claim 1, characterized in that: A plurality of guide grooves (6) are provided on each of the arc-shaped protrusions (3).

4. The heat exchange device for flue gas waste heat recovery according to claim 3, characterized in that: The plurality of guide grooves (6) are inclined and opposite to the inclination direction of the connecting protrusions (5); the two ends of the guide grooves (6) respectively connect the gaps between the arc protrusions (3).

5. The heat exchanger for flue gas waste heat recovery according to claim 1, characterized in that: The height of the arc-shaped protrusion (3) is 3 to 10 mm, and the height of the connecting protrusion (5) is 1.5 to 3 mm.

6. The heat exchanger for flue gas waste heat recovery according to claim 1, characterized in that: The cross-section of the arc-shaped protrusion (3) is trapezoidal.

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