Salt deposition prevention structure of heat exchanger
By incorporating an anti-salt-caking plate and a throttling orifice at the bottom of the heat exchanger, the problem of salt deposition in flue gas condensate during start-up and shutdown is solved, achieving the effect of preventing salt accumulation and corrosion. This design is suitable for industrial applications prone to salt deposition.
Patent Information
- Application Number
- CN202422552011.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-10-22
AI Technical Summary
When existing heat exchangers are started or stopped, the flue gas temperature is lower than the dew point, causing condensate to precipitate. Traditional structures cannot effectively prevent salt and scale formation, leading to corrosion problems.
Design a structure comprising two anti-salt-caking plates, each with throttling holes arranged in a V-shape. This allows for the shaking off of deposited salt through increased gas velocity and turbulence. The structure is also bolted together for easy cleaning and replacement.
It effectively prevents salt buildup at the bottom of the heat exchanger, reduces corrosion risk, and is easy to clean and replace, making it suitable for industrial applications prone to salt buildup.
Smart Images
Figure CN223500227U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a structure for preventing salt buildup in a heat exchanger. Background Technology
[0002] Dew point is the temperature at which water vapor in a gas becomes saturated; water vapor is the gaseous state of water. When a gas reaches its dew point temperature under a specific pressure, the water vapor and liquid water in the air are in equilibrium. Below the dew point, the liquid water will begin to condense on the solid surface.
[0003] Acid dew point corrosion is a common phenomenon in industrial applications. When the temperature reaches the dew point, the acid turns into a liquid and corrodes the surface of metallic materials. Dew point corrosion mainly occurs within storage equipment and structures. Common flue gases include sulfur oxides, carbon monoxide, and nitrogen oxides.
[0004] To avoid corrosion, in practical applications, the flue gas temperature is usually maintained above the dew point using a heater. However, during start-up and shutdown, the flue gas temperature inevitably drops below the dew point, and the condensate settles at the bottom of the equipment. Traditional heat exchangers have flat bottoms without a dedicated anti-salt-forming design, thus failing to prevent salt and scale buildup.
[0005] Therefore, a heat exchanger anti-salt-forming structure is proposed to address the above problems. Utility Model Content
[0006] The purpose of this invention is to overcome the existing defects and provide a heat exchanger anti-salt-forming structure that can prevent salt formation.
[0007] The technical solution to achieve the above objective is: a heat exchanger anti-salt-caking structure, comprising two anti-salt-caking plates, the two anti-salt-caking plates being connected to a base, with a gap between the two anti-salt-caking plates forming a salt storage port; and multiple throttling holes being provided on each of the two anti-salt-caking plates.
[0008] The base is connected to the lower end of the heat exchanger body, and the two anti-salt-caking plates are located below the heat exchanger tube bundle assembly.
[0009] Preferably, the anti-salt-caking plate includes a vertical plate and an inclined plate, the inclined plate is connected to the upper end of the vertical plate, the vertical plate is connected to the base, a plurality of throttling holes are formed on the inclined plate, and the inclined plate is close to the heat exchanger tube bundle assembly.
[0010] Preferably, the upper end of the inclined plate is connected to a connecting plate, the connecting plate has multiple threaded holes, and the connecting plate is connected to the heat exchanger body by multiple bolts.
[0011] Preferably, the heat exchanger tube bundle assembly has a V-shape below it, and the inclined plates of the two anti-salt-caking plates also form a V-shape and are located below the heat exchanger tube bundle assembly.
[0012] The beneficial effects of this utility model are as follows: The anti-salt-caking structure of this heat exchanger forms a V-shape by setting two anti-salt-caking plates with inclined plates, which are located below the heat exchanger tube bundle assembly. Throttling holes are set on the anti-salt-caking plates. When the shell-side gas passes through the anti-salt-caking plates, the gas velocity increases due to the throttling holes, impacting the bottom row of tube bundles that are prone to salt deposition. At the same time, the gas flowing in from the top will impact the gas flowing through the throttling holes, causing strong turbulence. The combined effect of the two will cause micro-vibration of the bottom tube bundle fins, which can shake off the salt deposited during gas cooling to the salt storage port. The shaken-off salt deposits flow into the lower salt storage area through the middle salt discharge channel.
[0013] Meanwhile, the anti-salt-caking structure is bolted to the heat exchanger body, and can be removed for salt removal when needed; it is also very easy to replace if necessary; it has a wide range of applications in various industrial fields, especially in situations prone to salt and scale buildup. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall application of the anti-salt-caking structure of the heat exchanger of this utility model;
[0015] Figure 2 This is a schematic diagram of the anti-salt-forming structure of the heat exchanger of this utility model;
[0016] Figure 3 This is a schematic diagram of the flue gas flow path during the operation of the heat exchanger body;
[0017] Figure 4 This is a schematic diagram of the operation of the anti-salt-forming structure of the heat exchanger of this utility model.
[0018] In the diagram: 1. Anti-salt-caking plate; 2. Base; 3. Salt storage port; 4. Throttling orifice; 5. Heat exchanger body; 6. Heat exchanger tube bundle assembly; 11. Vertical plate; 12. Inclined plate; 13. Connecting plate; 14. Threaded hole. Detailed Implementation
[0019] The technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0020] The present invention will be further described below with reference to the accompanying drawings.
[0021] like Figure 1-4 As shown, a heat exchanger anti-salt-caking structure includes two anti-salt-caking plates 1, which are connected to a base 2. A gap is left between the two anti-salt-caking plates 1 to form a salt storage port 3. Multiple throttling holes 4 are opened on each of the two anti-salt-caking plates 1. The anti-salt-caking plate 1 includes a vertical plate 11 and an inclined plate 12. The inclined plate 12 is connected to the upper end of the vertical plate 11, and the vertical plate 11 is connected to the base 2. Multiple throttling holes 4 are opened on the inclined plate 12, which is close to the heat exchanger tube bundle 6.
[0022] Specifically, the base 2 is connected to the lower end of the heat exchanger body 5, and the two anti-salt-causing plates 1 are located below the heat exchanger tube bundle assembly 6. The upper end of the inclined plate 12 is connected to the connecting plate 13, which has multiple threaded holes 14. The connecting plate 13 is connected to the heat exchanger body 5 by multiple bolts. The heat exchanger tube bundle assembly 6 is V-shaped, and the inclined plates 12 of the two anti-salt-causing plates 1 also form a V-shape and are located below the heat exchanger tube bundle assembly 6.
[0023] Specifically, the heat exchanger tube bundle 6 is arranged in a V-shape at the bottom, and the anti-salt-causing structure is arranged at the bottom of the heat exchanger. The anti-salt-causing structure is arranged along the V-shaped tube bundle at the bottom of the heat exchanger to prevent the shell-side fluid from bypassing. The anti-salt-causing structure is equipped with an anti-salt-causing plate, with a salt discharge channel (salt storage port 3) in the middle. The anti-salt-causing principle is as follows: the anti-salt-causing plate 1 is provided with a throttling orifice 4. When the shell-side gas passes through the anti-salt-causing plate 1, the gas velocity increases due to the throttling orifice, impacting the bottommost tube bundle that is prone to salt deposition. At the same time, the gas flowing in from the upper part will be affected by the gas flowing through the throttling orifice. The gas in the flow hole 4 is impacted, causing strong turbulence. The combined effect of these two factors causes micro-vibration of the bottom tube bundle finned tubes, which shakes off the salt deposits formed during gas cooling and directs them to the salt storage port 3. The shaken-off salt flows into the lower salt storage area through the middle salt discharge channel. The anti-salt-forming structure is bolted to the heat exchanger body 5. The anti-salt-forming structure can be removed for salt cleaning when needed. If necessary, this anti-salt-forming structure is also very easy to replace. It has a wide range of applications in various industrial fields, especially in situations where salt and scale are prone to form.
[0024] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A heat exchanger anti-salt-forming structure, characterized in that, It includes two anti-salt-caking plates (1), which are connected to the base (2). A gap is left between the two anti-salt-caking plates (1) to form a salt storage port (3). Multiple throttling holes (4) are opened on each of the two anti-salt-caking plates (1). The base (2) is connected to the lower end of the heat exchanger body (5), and the two anti-salt-caking plates (1) are located below the heat exchanger tube bundle (6).
2. The heat exchanger anti-salt-forming structure according to claim 1, characterized in that, The anti-salt-caking plate (1) includes a vertical plate (11) and an inclined plate (12). The inclined plate (12) is connected to the upper end of the vertical plate (11). The vertical plate (11) is connected to the base (2). Multiple throttling holes (4) are opened on the inclined plate (12). The inclined plate (12) is close to the heat exchanger tube bundle (6).
3. The heat exchanger anti-salt-forming structure according to claim 2, characterized in that, The upper end of the inclined plate (12) is connected to the connecting plate (13), and the connecting plate (13) has multiple threaded holes (14). The connecting plate (13) is connected to the heat exchanger body (5) by multiple bolts.
4. The heat exchanger anti-salt-forming structure according to claim 2, characterized in that, The heat exchanger tube bundle (6) is V-shaped at the bottom, and the inclined plates (12) of the two anti-salt-caking plates (1) are also V-shaped and located below the heat exchanger tube bundle (6).