Boiler heating surface pipeline and sand blasting head suitable for industrial production

Abstract

The utility model discloses a boiler heating surface pipeline suitable for industrial production, which comprises a pipeline body, an inner surface particle layer and an electroplated layer, and three kinds of metal powder with different particle sizes are sprayed on the inner surface of the pipeline body in a gradient mode to form the inner surface particle layer. Putting the sprayed pipeline body into an electroplating tank formed by mixing copper sulfate, sulfuric acid and hydrochloric acid, and electroplating to form an electroplated layer; the utility model further discloses a sand blasting head which comprises an air pipe, a top plate, a sand storage cylinder, an outer partition plate, a sand blasting hole, a bottom plate and an inner partition plate. Three kinds of metal powder with different particle sizes are sprayed on the inner surface of the pipeline body in a gradient mode, wettability of the inner surface of the pipeline is gradually enhanced from bottom to top, rewettability of liquid on the wall face is promoted, the inner wall face has high flow pattern regulation and control capacity and capillary liquid capacity, meanwhile, many nucleation sites are achieved, formation of bubbles is promoted, and the effect of improving the stability of the pipeline is achieved. The bubble nucleation density and the nucleation frequency are increased, and the dynamic requirements on the surface in different stages of vapor-liquid phase change are met.

Description

Technical Field

[0001] The utility model relates to a boiler heating surface pipe suitable for industrial production, in particular to a sandblasting head for gradient spraying metal powders with different particle sizes on the inner surface of the pipe body to form an inner surface particle layer, belonging to the technical field of heat transfer enhancement of heat exchange pipes. Background Technique

[0002] During the heating process of the boiler system, the working medium inside the heating surface undergoes a phase change from liquid to gas. This phase change process needs to absorb latent heat, which has a significant impact on the overall efficiency of the boiler. In the process of dynamic heat transfer, the heat transfer coefficient of gas is usually lower than that of liquid. Therefore, ensuring efficient heat transfer from the liquid phase to the heating surface is crucial for improving the overall performance of the system.

[0003] During the boiling heat transfer stage, different dominant heat transfer mechanisms lead to different requirements for enhanced surface characteristics. Large particle sizes have the optimal rewetting characteristics due to their larger roughness and porosity, which can maximize the promotion of the liquid phase close to the heating surface, thereby regulating the flow pattern of the working medium inside the heating surface. When the working medium inside the heating surface is at high dryness and high heat flux density, strong wettability can slow down the wall dry-out. Small particle sizes can increase the theoretical number of active nucleation sites on the same heating area. With more nucleation sites, the formation of bubbles can be promoted, the bubble nucleation density and departure frequency increase, and the strengthening effect is better under medium and low heat flux and dryness. This result causes that in different stages of the vapor-liquid phase change, the dynamic requirements for the surface during the heat transfer process cannot be met. Therefore, it is necessary to develop new structures and new process methods to solve the above technical difficulties and achieve the purpose of enhancing heat transfer. Content of the Utility Model

[0004] The utility model provides a boiler heating surface pipe suitable for industrial production, and also provides a sandblasting head for gradient spraying metal powders with different particle sizes on the inner surface of the pipe body to form an inner surface particle layer. By gradient spraying three or more kinds of metal powders with different particle sizes on the inner surface of the pipe body, the wettability of the inner surface of the pipe gradually increases from the bottom to the top, and the surface roughness gradually decreases, so that the Laplace pressure difference driving force for the liquid droplets to move to the upper wall surface inside the pipe can provide more liquid for the wall surface and promote the rewetting property of the wall surface liquid; while having strong flow pattern regulation and capillary liquid ability, the inner wall surface has more nucleation sites to promote the formation of bubbles, the bubble nucleation density and departure frequency increase, and the dynamic requirements for the surface in different stages of the vapor-liquid phase change are met.

[0005] The technical solutions adopted by the utility model to solve the technical problems are as follows:

[0006] A boiler heating surface pipe suitable for industrial production, the boiler heating surface pipe includes a pipe body, an inner surface particle layer and a plating layer;

[0007] The inner surface particle layer: is formed by spraying three or more different particle size metal powders on the inner surface of the pipe body in a gradient manner, and the particle size gradually increases from small to large along the bottom end of the pipe inner wall, showing a gradient distribution.

[0008] The electroplated layer: is formed by electroplating the pipe body sprayed with the inner surface particle layer in an electroplating bath mixed with copper sulfate, sulfuric acid and hydrochloric acid.

[0009] Preferably, the inner surface particle layer is formed by spraying three different particle size metal powders on the inner surface of the pipe body in a gradient manner, including a large particle area, a medium particle area and a small particle area.

[0010] A sandblasting head, which sprays metal powders with different particle sizes on the inner surface of the pipe body in a gradient manner to form an inner surface particle layer. The sandblasting head is composed of an air pipe, a top plate, a sand storage cylinder, an outer partition, a sandblasting hole, a bottom plate and an inner partition; the air pipe penetrates through the top plate and is connected to the bottom plate, and air outlet holes are arranged on the air pipe between the top plate and the bottom plate, and the number of the air outlet holes matches the number of the inner partitions.

[0011] Preferably, the same number of inner partitions and outer partitions are respectively arranged inside and outside the sand storage cylinder, and sandblasting holes are arranged at the bottom of the sand storage cylinder.

[0012] Preferably, the number of the outer partitions and the inner partitions is at least three or more.

[0013] Preferably, the number of the sandblasting holes is one or more.

[0014] The beneficial effects of the utility model are as follows:

[0015] 1. Based on bionics, the utility model sets a gradient structure on the inner surface of the pipe, making the wettability of the inner surface of the pipe gradually increase from the bottom to the top and the surface roughness gradually decrease, so that the Laplace pressure difference driving force for the liquid droplet to move to the upper wall surface inside the pipe can provide more liquid for the wall surface and promote the re-wetting of the wall surface liquid.

[0016] 2. By applying the large particle size and small particles in a gradient on the inner surface of the pipe, the inner wall surface has strong flow pattern regulation and capillary liquid capacity while having more nucleation sites, promoting the formation of bubbles, increasing the bubble nucleation density and the nucleation separation frequency, and meeting the dynamic requirements of the surface in different stages of the vapor-liquid phase change.

[0017] 3. The process of the utility model is simple and the cost is low, which has important significance in the industrial practical application of the boiler heating surface pipe and has strong practicability and popularization value. Description of the Drawings

[0018] To more clearly illustrate the technical solution of the present utility model, the accompanying drawings required for the description of the present utility model will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other corresponding drawings can be obtained based on these drawings; by reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, purposes, and advantages of the present utility model will become more obvious:

[0019] Figure 1 is a schematic structural view of the boiler heating surface pipe in the present utility model;

[0020] Figure 2 is a schematic structural view of the sandblasting head in the present utility model;

[0021] Figure 3 is a schematic structural view of the interior of the sandblasting head in the present utility model.

[0022] In the drawings: 1 - pipe body, 2 - inner surface particle layer, 201 - large particle area, 202 - medium particle area, 203 - small particle area, 3 - sandblasting head, 301 - air pipe, 302 - top plate, 303 - sand storage cylinder, 304 - outer partition, 305 - sandblasting hole, 306 - bottom plate, 307 - inner partition. Specific embodiments

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than 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 efforts belong to the scope of protection of the present utility model.

[0024] Embodiment 1. Refer to Figure 1 , a boiler heating surface pipe suitable for industrial production, including a pipe body 1, an inner surface particle layer 2, and a plating layer 3;

[0025] Inner surface particle layer 2: It is formed by gradient spraying of three or more metal powders with different particle sizes on the inner surface of the pipe body 1, and the particle size gradually increases from small to large along the bottom end of the pipe inner wall, showing a gradient distribution;

[0026] Plating layer 3: The pipe body sprayed with the inner surface particle layer 2 is electroplated in an electroplating bath mixed with copper sulfate, sulfuric acid, and hydrochloric acid.

[0027] Among them, Figure 1The inner surface particles 2 are formed by gradient spraying three kinds of metal powders with different particle sizes on the inner surface of the pipe body, including a large particle area 201, a medium particle area 202, and a small particle area 203.

[0028] Example 2. Refer to Figure 2 and Figure 3 , a sandblasting head that gradient sprays metal powders with different particle sizes on the inner surface of the pipe body 1 to form an inner surface particle layer 2. The sandblasting head is composed of an air pipe 301, a top plate 302, a sand storage cylinder 303, an outer partition 304, sandblasting holes 305, a bottom plate 306, and an inner partition 307; the air pipe 301 passes through the top plate 302 and is connected to the bottom plate 306. Air outlet holes (not shown in the figure) are provided on the air pipe 301 between the top plate 302 and the bottom plate 306, and the number of air outlet holes matches the number of inner partitions 307.

[0029] An equal number of inner partitions 307 and outer partitions 304 are respectively arranged inside and outside the sand storage cylinder (303), and sandblasting holes 305 are provided at the bottom of the sand storage cylinder 303.

[0030] The number of the outer partitions 304 and the inner partitions 307 is at least three or more, and there are four in the figure.

[0031] The number of the sandblasting holes 305 is one or more, and there are five in the figure.

[0032] Example 3. A preparation process for a boiler heating surface pipe applicable to industrial production:

[0033] A. Place metal powder particles with different particle sizes into the sandblasting head described in Example 2;

[0034] B. Connect the air pipe 301 of the sandblasting head to an external high-pressure air pipe, and place the sandblasting head inside the pipe body 1;

[0035] C. Turn on the external high-pressure air. Driven by the high-pressure air, the metal powder particles are fixed on the inner surface of the pipe body 1, and the sandblasting head is gradually moved;

[0036] D. After the sandblasting of the pipe body 1 is completed, take out the sandblasting head, and put the base pipe with gradient inner surface particles 2 into an electroplating bath mixed with copper sulfate, sulfuric acid, and hydrochloric acid for electroplating to form a dense electroplating layer inside the pipe, so that the inner surface particles 2 are more firmly combined with the pipe body 1.

[0037] Based on bionics, the present invention sets a gradient structure on the inner surface of the pipe, gradually enhances the wettability of the inner surface of the pipe from the bottom to the top, and gradually reduces the surface roughness, so that the Laplace pressure difference driving force for the liquid droplet to move to the upper wall surface inside the pipe can provide more liquid for the wall surface and promote the re-wettability of the wall surface liquid.

[0038] The utility model gradient-applies large particle sizes and small particles on the inner surface of the pipeline, so that while having strong flow pattern regulation and capillary liquid capacity, the inner wall surface has more nucleation sites, promotes the formation of bubbles, increases the bubble nucleation density and the nucleus separation frequency, and meets the dynamic requirements for the surface in different stages of the vapor-liquid phase change.

[0039] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A boiler heating surface pipe applicable to industrial production, characterized in that: The boiler heating surface pipe includes a pipe body (1), an inner surface particle layer (2), and a plating layer (3). The inner surface particle layer (2): is formed by gradient spraying three or more metal powders with different particle sizes on the inner surface of the pipe body (1), and the particle sizes gradually increase from small to large along the bottom end of the pipe inner wall, showing a gradient distribution. The plating layer (3): covers the inner surface particle layer (2) and is formed by an electroplating process.

2. The boiler heating surface pipe applicable to industrial production according to claim 1, wherein: The inner surface particle layer (2) is formed by gradient spraying three metal powders with different particle sizes on the inner surface of the pipe body (1), and includes a large particle area (201), a medium particle area (202), and a small particle area (203).

3. A sandblasting head that gradient sprays metal powders with different particle sizes on the inner surface of a pipe body (1) to form a surface particle layer (2), characterized in that: The sandblasting head is composed of an air pipe (301), a top plate (302), a sand storage cylinder (303), an outer partition plate (304), a sandblasting hole (305), a bottom plate (306), and an inner partition plate (307); the air pipe (301) penetrates through the top plate (302) and is connected to the bottom plate (306), and air outlet holes are provided on the air pipe (301) between the top plate (302) and the bottom plate (306), and the number of the air outlet holes matches the number of the inner partition plates (307).

4. The sandblasting head according to claim 3, characterized in that: The same number of inner partition plates (307) and outer partition plates (304) are respectively arranged inside and outside the sand storage cylinder (303), and a sandblasting hole (305) is provided at the bottom of the sand storage cylinder (303).

5. The sandblasting head according to claim 4, characterized in that: The number of the outer partition plates (304) and the inner partition plates (307) is at least three or more.

6. The sandblasting head according to claim 4, wherein: The number of the sandblasting holes (305) is one or more.

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