Micro-turbulence heat exchange element and heat exchange equipment
By setting S-shaped micro-turbulence grooves and 3D composite corrugations on the surface of the heat exchange plate, the problems of poor heat exchange effect and easy clogging of the heat exchange equipment are solved, achieving more efficient heat energy exchange and equipment self-cleaning, and improving the overall performance of the equipment.
Patent Information
- Application Number
- CN202423314942.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing heat exchange equipment has poor heat exchange efficiency and is prone to clogging, which is particularly problematic in thermal power plants, steel mills, and chemical plants.
The micro-turbulence heat exchange element is adopted, including multiple S-shaped micro-turbulence grooves on the surface of the heat exchange plate to form a turbulent airflow layer, increase the heat exchange area and extend the heat energy residence time. At the same time, it is combined with 3D composite heat exchange corrugations to reduce dust condensation and form an active self-cleaning function.
It improves heat exchange efficiency, reduces clogging, enhances the equipment's anti-clogging ability, and improves the equipment's economy and thermal efficiency.
Smart Images
Figure CN223649787U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas heat exchanger technology, specifically to a micro-turbulence heat exchange element and heat exchange equipment. Background Technology
[0002] Currently, heat recovery equipment used in thermal power plants, steel mills, and chemical plants is mostly of two types: rotary air preheaters and regenerative flue gas heat exchangers (hereinafter referred to as heat exchange equipment). Due to the needs of economic development, my country has successively launched a large number of coal-fired power plants, steel mills, and chemical plants, leading to the widespread application of heat exchange equipment. Based on the usage experience of major domestic owners and operational surveys of heat exchange equipment, the main problem currently faced by heat exchange equipment is poor heat exchange efficiency. Extensive simulation design has revealed that the waveform design of the heat exchange elements within the heat exchange equipment is key to improving the heat exchange efficiency. Utility Model Content
[0003] The purpose of this invention is to provide a micro-turbulence heat exchange element to solve the problems of poor heat exchange effect of heat exchange elements in the above-mentioned background art.
[0004] Another objective of this invention is to provide a heat exchange device with micro-turbulence heat exchange elements, which can reduce blockage and increase heat exchange efficiency.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A micro-turbulence heat exchange element includes: a first heat exchange plate, wherein the heat exchange surface of the first heat exchange plate and the airflow has multiple S-shaped micro-turbulence grooves, so that a turbulent airflow layer appears on the heat exchange surface of the first heat exchange plate during heat exchange. The thickness of the first heat exchange plate is 0.5-1 mm, and the depth of the micro-turbulence grooves is 0.1-0.5 mm. By setting multiple S-shaped micro-turbulence grooves on the heat exchange surface of the first heat exchange plate, a "turbulent airflow layer" can be formed on the heat exchange surface of the heat exchange element, thereby increasing the heat energy residence time of the airflow and improving the heat exchange effect.
[0007] Furthermore, the multiple micro-turbulence channels are parallel to each other.
[0008] Furthermore, the extension direction of the micro-turbulence groove is the same as the flow direction of the heat exchange airflow. This arrangement can better improve the airflow disturbance effect.
[0009] Furthermore, the total area of the micro-turbulence grooves accounts for 50% to 80% of the area of the first heat exchange plate.
[0010] Furthermore, the width of the micro-turbulence groove is ≤1.5mm.
[0011] Furthermore, it also includes a second heat exchange plate, which is disposed opposite to the first heat exchange plate and forms an airflow channel between them; the opposing surfaces of the second and first heat exchange plates are only provided with S-shaped micro-turbulence grooves; or, the opposing surfaces of the second and first heat exchange plates form heat exchange ripples on the basis of the S-shaped micro-turbulence grooves, and the second heat exchange plate has S-shaped micro-turbulence grooves superimposed on the heat exchange ripples, presenting a 3D composite heat exchange ripple. This configuration can effectively solve the problems of low heat exchange efficiency and severe blockage of heat exchange elements.
[0012] The depth of the heat exchange corrugations is 2–20 mm.
[0013] Furthermore, the thickness of the second heat exchange plate is 0.5 to 1 mm.
[0014] Furthermore, the width of the single heat exchange corrugation is 5–20 mm.
[0015] Furthermore, the heat exchange corrugations are wavy.
[0016] A heat exchange device includes the aforementioned micro-turbulence heat exchange element. During operation, the presence of the micro-turbulence groove creates a turbulent environment for the entire heat exchange device. Dust and byproducts in the hot airflow flow downwards into the lower channel due to the airflow disturbance. This micro-turbulence technology allows each part of the heat exchange element to generate micro-turbulence, altering the original airflow direction and thus completely solving the clogging and heat exchange problems of the heat exchange device. Furthermore, the application of the micro-turbulence heat exchange element improves the heat exchange effect. Moreover, the appearance of a "turbulent airflow layer" on the heat exchange surface of the first heat exchange plate significantly reduces the probability of dust and environmental byproducts condensing on the surface of the heat exchange element, forming an active self-cleaning function for the heat exchange element and reducing clogging. Simultaneously, the presence of the turbulent airflow layer increases the residence time of the flue gas's heat energy. Due to the increased heat exchange effect, the gaps between the original heat exchange element corrugations can be enlarged, thereby improving the anti-clogging properties between the heat exchange elements and significantly improving the economic efficiency of the heat exchange device.
[0017] This invention has the following advantages over the prior art:
[0018] 1. The micro-turbulence heat exchange element of this utility model includes a first heat exchange plate. The heat exchange surface between the first heat exchange plate and the airflow has multiple S-shaped micro-turbulence grooves. The thickness of the first heat exchange plate is 0.5-1mm, and the depth of the micro-turbulence grooves is only 0.1-0.5mm. By setting the micro-turbulence grooves, the heat exchange area is increased, and a "turbulent airflow layer" appears on the heat exchange surface of the first heat exchange plate, which increases the residence time of the airflow's heat energy and effectively increases the heat exchange effect.
[0019] 2. The hot air flow velocity in general heat exchange equipment is between 10m / s and 15m / s. In addition, the rotation speed of the heat exchange equipment itself is also considered. In this invention, multiple S-shaped micro-turbulence grooves are provided on the surface of the micro-turbulence heat exchange element, which puts the entire heat exchange equipment in an environment of airflow disturbance. Dust and by-products in the hot air flow flow down to the lower channel with the flue gas disturbance. This micro-turbulence technology can generate micro-turbulence function in every part of the heat exchange element, destroy the viscosity of the hot air surface, thereby increasing the anti-clogging ability. At the same time, it increases the heat exchange surface area and improves the thermal efficiency of the equipment.
[0020] 3. The heat exchange equipment using micro-turbulence heat exchange elements in this utility model increases the heat exchange area and improves the heat exchange effect by setting multiple S-shaped micro-turbulence grooves on the surface of the heat exchange elements. Moreover, the "turbulent airflow layer" on the heat exchange surface of the heat exchange plate can significantly reduce the probability of dust and environmental by-products in the flue gas condensing on the surface of the heat exchange elements, forming an active self-cleaning function of the heat exchange elements and reducing the blockage of the heat exchange elements. At the same time, due to the appearance of the turbulent airflow layer, the heat energy residence time of the flue gas is increased. Due to the increase in heat exchange effect, the gap between the original heat exchange elements can be increased, thereby improving the anti-blocking ability between the heat exchange elements and greatly improving the economy of the heat exchange equipment. Attached Figure Description
[0021] Figure 1 This is a plan view of the first heat exchange plate in the micro-turbulence heat exchange element of Embodiment 1 of this utility model;
[0022] Figure 2 This is a schematic diagram of the structure of the first heat exchange plate in the micro-turbulence heat exchange element of Embodiment 1 of this utility model;
[0023] Figure 3 This is a cross-sectional schematic diagram of the first heat exchange plate in the micro-turbulence heat exchange element of Embodiment 1 of this utility model;
[0024] Figure 4 This is a schematic diagram of the operation of the first heat exchange plate in the micro-turbulence heat exchange element in Embodiment 1 of this utility model;
[0025] Figure 5 This is a schematic diagram of the structure of the first heat exchange plate and the second heat exchange plate in Embodiment 2 of this utility model.
[0026] In the figure: 1. First heat exchange plate; 2. Micro-turbulence groove; 3. Second heat exchange plate; 4. Heat exchange corrugations. Detailed Implementation
[0027] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0028] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.
[0029] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale.
[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be further discussed and described in the description of the subsequent figures.
[0031] Example 1:
[0032] like Figures 1 to 4 As shown, this utility model provides a micro-turbulence heat exchange element, comprising: a first heat exchange plate 1, wherein the heat exchange surface of the first heat exchange plate 1 and the airflow has multiple S-shaped micro-turbulence grooves 2, so that a turbulent airflow layer appears on the heat exchange surface of the first heat exchange plate 1 during heat exchange. The multiple micro-turbulence grooves are parallel to each other. The thickness of the first heat exchange plate 1 is 0.5-1 mm, the depth of the micro-turbulence grooves 2 is 0.1-0.5 mm, for example, 0.2 mm, 0.3 mm, or 0.4 mm, preferably 0.3 mm, and the width of the micro-turbulence grooves 2 is ≤1.5 mm, for example, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, preferably 1 mm. The total area of the micro-turbulence grooves 2 accounts for 50%-80% of the area of the first heat exchange plate 1. By setting multiple S-shaped micro-turbulence grooves 2 on the heat exchange surface of the first heat exchange plate 1, a "turbulent airflow layer" can be formed on the heat exchange surface of the heat exchange element, which increases the heat exchange residence time of the airflow and effectively increases the heat exchange effect.
[0033] Specifically, the extension direction of the micro-turbulence groove 2 is the same as the flow direction of the heat exchange airflow. This setting can better improve the airflow disturbance effect.
[0034] like Figure 3 As shown, the cross-section of the micro-turbulence channel 3 is preferably trapezoidal. Compared with the curved cross-section, the trapezoidal cross-section can further increase the heat exchange area and improve the heat exchange effect of the first heat exchange plate.
[0035] In this embodiment, both the upper and lower surfaces of the first heat exchange plate 1 participate in airflow heat exchange. Specifically, both surfaces of the first heat exchange plate have multiple S-shaped micro-turbulence grooves 2, which are parallel to each other. The thickness of the first heat exchange plate 1 is 0.7 mm, the depth of the micro-turbulence grooves 2 is 0.4 mm, and the width of the micro-turbulence grooves 2 is 1 mm. The total area of the micro-turbulence grooves 2 accounts for 60% of the area of the first heat exchange plate 1. During operation, due to the presence of the micro-turbulence grooves, a "turbulent airflow layer" appears on both the upper and lower surfaces of the first heat exchange plate. By setting the micro-turbulence grooves, the heat exchange area is increased, and a "turbulent airflow layer" appears on the heat exchange surface of the first heat exchange plate, increasing the residence time of the flue gas's heat energy and effectively improving the heat exchange effect.
[0036] In another embodiment, only the upper or lower surface of the first heat exchange plate 1 participates in airflow heat exchange; that is, the surface of the first heat exchange plate 1 participating in airflow heat exchange is provided with multiple S-shaped micro-turbulence grooves 2. These micro-turbulence grooves 2 are parallel to each other. The thickness of the first heat exchange plate 1 is 0.9 mm, the depth of the micro-turbulence grooves 2 is 0.3 mm, the width of the micro-turbulence grooves 2 is 0.7 mm, and the total area of the micro-turbulence grooves 2 accounts for 70% of the area of the first heat exchange plate 1.
[0037] In specific implementation, such as Figure 4 As shown, multiple first heat exchange plates 1 are used in pairs. At this time, a gasket is placed between two adjacent first heat exchange plates 1, forming an airflow channel between them. Because the airflow channel formed between two adjacent first heat exchange plates 1 is small, it can be applied to heat exchange equipment that uses clean hot air sources to avoid dust particles in unpurified hot air clogging the micro-turbulence channel.
[0038] Example 2:
[0039] When pulverized coal is burned in boilers, used in steelmaking sintering machines, or used in chemical synthesis catalysis, it produces a large amount of harmful nitrogen oxides (NOx) and ammonium bisulfate. Hot air flows carry these harmful substances and dust into heat exchange equipment.
[0040] Based on the actual operation of heat exchange equipment in China, research has revealed that the heat exchange elements introduced to my country in the 1990s mostly featured triangular diagonal corrugations and straight-channel corrugated waveforms at various angles. Scientific literature indicates that when the hot airflow velocity through heat exchange equipment reaches 12-15 m / s, the fly ash particle size is between 1-40 μm, and the impact angle is between 45 and 60 degrees, significant frictional force is generated. Currently, the corrugation angle of domestic heat exchange elements is between 55 and 60 degrees. This results in numerous airflow angles on the surface of these corrugated elements. These angles do not participate in airflow disturbance, leading to increased adhesion of the hot airflow to the surface, causing scaling and fouling. Consequently, the resistance to hot airflow increases, reducing heat exchange efficiency. Reducing blockage in heat exchange equipment and elements and improving heat exchange efficiency are key issues that need to be addressed.
[0041] refer to Figure 5 In this embodiment, the opposing surfaces of the second heat exchange plate 3 and the first heat exchange plate 1 are provided with S-shaped micro-turbulence grooves 2, and heat exchange corrugations 4 are formed. The depth of the heat exchange corrugations 4 is 2-20 mm, for example, 5 mm, 8 mm, 10 mm, 15 mm, etc., preferably 16 mm. The width of the heat exchange corrugations is 5-20 mm, for example, 6 mm, 8 mm, 15 mm, etc., preferably 10 mm. The heat exchange corrugations appear as wavy lines when viewed along the y-axis (i.e., longitudinal direction), such as... Figure 5 As shown, the surface of the first heat exchange plate 1 has trapezoidal micro-turbulence grooves, and the surface of the second heat exchange plate combines trapezoidal micro-turbulence grooves with wavy heat exchange ripples, presenting a 3D composite heat exchange ripple. In this embodiment, multiple S-shaped micro-turbulence grooves are provided on the surface of the heat exchange element to increase the heat exchange area and improve the heat exchange effect. At the same time, the second heat exchange plate, combined with large wavy heat exchange ripples, creates a "turbulent airflow layer" on the heat exchange surface of the heat exchange element during use. This can significantly reduce the probability of dust and environmental byproducts in the flue gas condensing on the surface of the heat exchange element, forming an active self-cleaning function for the heat exchange element and reducing the clogging of the heat exchange element.
[0042] In another embodiment, the cross-section of the micro-turbulence grooves of the first heat exchange plate 1 and the second heat exchange plate 3 can be selected as curved, etc., and preferably a trapezoidal cross-section with the best heat exchange effect.
[0043] A heat exchange device, such as a rotary air preheater, a regenerative flue gas heat exchanger, or other heat recovery devices, applies the micro-turbulence heat exchange element of this embodiment. The micro-turbulence groove of the heat exchange element creates disturbance on the surface of the hot air flow, destroying the viscosity of the hot air flow surface, thereby increasing the anti-clogging ability. At the same time, it increases the heat exchange surface area and improves the thermal efficiency of the device.
[0044] When the heat exchanger is working, the presence of the micro-turbulence channel 2 creates a turbulent environment for the entire heat exchanger. Dust and byproducts in the hot airflow flow downwards into the lower channel along with the flue gas turbulence. This micro-turbulence technology allows each part of the heat exchange element to generate micro-turbulence, changing the original airflow direction and thus completely solving the blockage and heat exchange problems of the heat exchanger. In addition, the application of micro-turbulence heat exchange elements can improve the heat exchange effect; at the same time, the appearance of the turbulent airflow layer increases the heat energy residence time of the airflow. Due to the increased heat exchange effect, the gaps between the original heat exchange elements can be increased, thereby improving the anti-clogging ability between the heat exchange elements and significantly improving the economic efficiency of the heat exchanger.
[0045] Existing heat exchange elements only have straight or inclined corrugations, forming straight-walled and inclined channels. Flue gas flows downwards following the shape of the corrugations, failing to generate any disturbance. Due to gravity and adhesion, layers of scale gradually accumulate on the heat exchange elements, causing blockages and affecting heat exchange efficiency. This micro-turbulence heat exchange element solves the blockage problem of existing heat exchange equipment, improving overall economic efficiency and providing a permanent solution.
[0046] 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 and their equivalents.
Claims
1. A micro-turbulence heat transfer element, characterized in that, include: The first heat exchange plate has multiple S-shaped micro-turbulence grooves on its heat exchange surface with the airflow, so that a turbulent airflow layer appears on the heat exchange surface of the first heat exchange plate during heat exchange. The thickness of the first heat exchange plate is 0.5 to 1 mm, and the depth of the micro-turbulence grooves is 0.1 to 0.5 mm.
2. The micro-turbulence heat exchange element according to claim 1, characterized in that: The multiple micro-turbulence channels are parallel to each other.
3. The micro-turbulence heat exchange element according to claim 1, characterized in that: The extension direction of the micro-turbulence channel is the same as the flow direction of the heat exchange airflow.
4. The micro-turbulence heat exchange element according to claim 1, characterized in that: The total area of the micro-turbulence channels accounts for 50% to 80% of the area of the first heat exchange plate.
5. The micro-turbulence heat exchange element according to claim 1, characterized in that: The width of the micro-turbulence groove is ≤1.5mm.
6. The micro-turbulence heat exchange element according to claim 1, characterized in that: It also includes a second heat exchange plate, which is arranged opposite to the first heat exchange plate and forms an airflow channel between them; the opposite surfaces of the second heat exchange plate and the first heat exchange plate are provided with only S-shaped micro-turbulence grooves; or, the opposite surfaces of the second heat exchange plate and the first heat exchange plate are provided with heat exchange ripples on the basis of having S-shaped micro-turbulence grooves, and the depth of the heat exchange ripples is 2 to 20 mm.
7. The micro-turbulence heat exchange element according to claim 6, characterized in that: The thickness of the second heat exchange plate is 0.5 to 1 mm.
8. The micro-turbulence heat exchange element according to claim 6, characterized in that: The width of the heat exchange corrugations is 5–20 mm.
9. The micro-turbulence heat exchange element according to claim 6, characterized in that: The heat exchange corrugations are wavy.
10. A heat exchange device, characterized in that: It includes the micro-turbulence heat exchange element according to any one of claims 1 to 9.