CN116678257A - A composite high-flux tube and its production process - Google Patents

Abstract

The utility model relates to a composite high-flux tube and a production process thereof, the composite high-flux tube comprises a heat exchange tube body, wherein the inner surface and the outer surface of the heat exchange tube body are both provided with a polymeric layer, the outer side wall of the heat exchange tube body is provided with a porous layer, the inner side wall of the heat exchange tube body is provided with a heat exchange layer, and the heat exchange layer is provided with a plurality of through holes along the axial direction of the heat exchange layer. And a plurality of heat exchange grooves are uniformly formed in the inner wall of the through hole along the axial direction of the heat exchange tube body. To this compound high flux pipe, it has effectively increased the adhesion stress of inside and outside pipe through setting up the one deck polymeric layer between the inner wall and the outer wall of heat exchange tube body to the outside of heat exchange tube body is provided with the porous layer, and the inboard is provided with a plurality of through-holes, and evenly has offered a plurality of heat transfer grooves on the inner wall of every through-hole, has further increased the heat transfer area of compound high flux pipe, thereby has promoted the efficiency of heat transfer greatly.

Description

A composite high-flux tube and its production process

technical field

The invention relates to the technical field of high-flux tubes, in particular to a composite high-flux tube and a production process thereof.

Background technique

At present, large-scale domestic chemical companies, including petrochemical and coal chemical industry, generally use traditional shell-and-tube heat exchangers in the separation process of low-carbon olefins, which use smooth surface tubes. Although the heat exchanger is convenient to manufacture, cheap in price and easy to maintain, it has low efficiency and cannot realize energy conservation and utilization. High-efficiency heat exchange tubes are generally used abroad to manufacture high-efficiency heat exchangers, which can not only improve heat exchange efficiency, but also save steam. Commonly used high-efficiency tubes include T-shaped tubes, finned tubes, corrugated tubes, threaded tubes, porous surface tubes, and high-flux tubes. These heat exchange tubes have their own scope of application and advantages and disadvantages, but in a comprehensive comparison, the high-flux tube has the best heat transfer effect in boiling heat transfer and condensation heat transfer, and the boiling heat transfer coefficient of the porous surface reaches 10 times that of the light tube. The condensation heat transfer of the heat exchange tank reaches 3-4 times that of the light tube.

In the prior art, such as the Chinese patent whose publication number is CN205479762U, it discloses a stainless steel composite pipe, comprising an outer pipe and an inner pipe, the inner pipe is socketed in the outer pipe, and the outer pipe and the inner pipe The gap between them is 1-5mm; the inner surface of the inner tube is provided with a lubricating layer, and the outer surface of the inner tube is provided with a polymer layer with a thickness of 0.01-0.1mm. The utility model sets a lubricating layer on the inner surface of the inner tube of the stainless steel composite tube, and covers the inner tube with a polymer layer, which effectively increases the bonding force between the inner and outer tubes, and can effectively solve the poor thermal conductivity of the general bimetallic tube. It can be widely used in the field of heat exchanger steel pipes in petroleum, chemical, fertilizer, power station, shipbuilding, refrigeration, food, medicine, nuclear industry, military industry, marine engineering, water supply and drainage industries.

The above-mentioned existing technical solutions have the following defects: although the above-mentioned composite pipe can effectively solve the problem of poor thermal conductivity of general bimetallic pipes, in actual use, the inner and outer walls of the outer pipe and the inner pipe are smooth surfaces , leading to a limited heat transfer area, the composite tube still has the problem of low heat transfer efficiency. Therefore, there is an urgent need to develop a high-flux tube with high heat transfer efficiency.

Contents of the invention

Aiming at the deficiencies in the prior art, the object of the present invention is to provide a composite high-flux tube and its production process, which increases the heat exchange area of the composite high-flux tube by setting a porous layer on the outside, and improves the heat transfer efficiency. Thermal efficiency.

Above-mentioned purpose of the invention of the present invention is achieved through the following technical solutions:

A composite high-flux tube, comprising a heat exchange tube body, the inner and outer surfaces of the heat exchange tube body are provided with a polymer layer, the outer wall of the heat exchange tube body is provided with a porous layer, and the heat exchange tube body is A heat exchange layer is provided on the inner side wall of the heat exchange layer, and several through holes are provided along the axial direction of the heat exchange layer.

In a preferred example, the present invention can be further configured as: a plurality of heat exchange grooves are evenly formed on the inner wall of the through hole along the axial direction of the heat exchange tube body.

In a preferred example, the present invention can be further configured as follows: the number of the heat exchange tanks is 60-70.

In a preferred example, the present invention may be further configured as follows: the depth of the heat exchange groove is 0.6-0.9mm.

In a preferred example of the present invention, it can be further configured as follows: the thickness of the polymer layer is 0.03-0.08 mm.

In a preferred example, the present invention can be further configured as follows: the polymer layer is any one of copper-based solder, zinc-aluminum-based solder, aluminum-based solder, cobalt-based solder, and silver-based solder.

In a preferred example, the present invention can be further configured as follows: the thickness of the porous layer is 0.8-1.2 mm, the porosity is 70-75%, and the equivalent diameter is 70-80 μm.

In a preferred example, the present invention can be further configured as follows: the outer diameter of the heat exchange tube is 30 mm, the wall thickness is 1.5 mm, and the heat exchange tube is a steel pipe.

According to the above-mentioned production process of a composite high-flux tube, the steps are as follows:

Step 1. When cleaning the heat exchange tubes, first blast the outer surface of the steel pipe with a sandblasting machine, and then polish the outer surface of the steel pipe to remove floating rust on the outer surface of the steel pipe , make the outer surface of the steel pipe smooth, and then carry out degreasing treatment on the outer surface of the steel pipe by detergent, so that the outer surface of the steel pipe is free of oil, and then dry the steel pipe, so that the outer surface of the steel pipe The surface is dry, free of oil and floating rust, and then proceed to the next step of processing;

Step 2. When preparing the coating material, the main material of the coating material is 400 mesh-600 mesh reduced iron powder, and the solder powder is 5%-10% by weight of the reduced iron powder. Add the solder powder into the reduced iron powder, stir the reduced iron powder and the solder powder evenly, add glue and metal brazing material, and make the reduced iron powder through the glue and the metal brazing material. The iron powder and the solder powder form a liquid binder mixture;

Step 3. When applying the binder mixture on the inner and outer surfaces of the steel pipe, ensure that the steel pipe is in a state of constant speed rotation, and apply the binder mixture evenly on the steel pipe through a spray gun or a brush When using the spray gun for coating, keep the spray gun moving at a constant speed, and keep the flow rate of the adhesive mixture sprayed out by the spray gun constant. When using a brush to coat the adhesive When binding the adhesive mixture, the adhesive mixture is evenly coated on the inner and outer surfaces of the steel pipe by the brush, so that the outer surface of the steel pipe forms an adhesive polymerized layer with a uniform thickness;

Step 4. When the binder mixture is evenly coated on the inner and outer surfaces of the steel pipe and then dried, the steel pipe is kept in a state of constant speed rotation, and dried by natural drying;

Step 5. After the binder mixture is dried on the outer surface of the steel pipe, extrude the outer surface of the steel pipe through a mold, so that the binder mixture is stressed, and then the bonding The agent mixture forms a layer of uniform and tight coating layer on the outer surface of the steel pipe;

Step 6. When the hole is made by the ultrasonic hole maker, the steel pipe passes through the ultrasonic hole maker while rotating at a constant speed and advances at a constant speed, and keeps the frequency of the ultrasonic hole maker consistent, passes through the ultrasonic hole maker The ultrasonic wave makes holes on the coating layer, and controls the porosity of the holes on the coating layer through the frequency of the ultrasonic hole maker;

Step 7. Install the heat exchange tube on the punching machine, use the punching machine to punch out multiple through holes with multiple heat exchange grooves on the inner wall in the interlayer of the heat exchange tube, and then insert the heat exchange tube coaxially into the heat exchange tube body , the outer wall of the heat exchange tube is attached to the inner wall of the heat exchange tube body and forms a transition fit;

Step 8: When performing composite sintering on the steel pipes that have been made holes, place the steel pipes in a sintering furnace, the temperature of the sintering furnace is controlled between 400 degrees Celsius and 500 degrees Celsius, and during sintering, the The steel pipe is in a state of constant speed rotation, so that the coating layer forms a porous layer on the outer surface of the steel pipe, and at the same time makes the inner wall of the heat exchange tube body form a heat exchange layer.

In a preferred example, the present invention can be further configured as follows: after the completion of the eighth step, the inner wall and the outer wall of the composite high-flux tube are subjected to secondary grinding and polishing treatment to obtain a finished product.

In summary, the present invention includes at least one of the following beneficial technical effects:

The invention discloses a composite high-flux tube and its production process. For the composite high-flux tube, a polymer layer is arranged between the inner wall and the outer wall of the heat exchange tube body to effectively increase the adhesion of the inner and outer tubes. The joint force can effectively solve the problem of poor thermal conductivity of general bimetallic tubes, and the outer side of the heat exchange tube body is provided with a porous layer, and the inner side is provided with multiple through holes, and the inner wall of each through hole is evenly opened with multiple holes. A heat exchange tank further increases the heat exchange area of the composite high-flux tube, thus greatly improving the heat exchange efficiency.

For the production process of this composite high-flux pipe, the porosity can be effectively controlled when making holes through the ultrasonic pore-making method, so that the porous layer on the surface of the steel pipe tends to be consistent, ensuring that when the porous layer is processed, the pores The specifications of the rate are easy to control and improve the actual use efficiency. In this process, compounding and sintering are turned into one process, so only one heat treatment process is required, which saves the process, not only improves the production efficiency, but also greatly saves the production cost.

Description of drawings

Fig. 1 is a cross-sectional view showing a composite high flux tube of the present invention.

FIG. 2 is a partially enlarged schematic diagram of part A in FIG. 1 .

Reference signs: 1. Heat exchange tube body; 2. Polymerization layer; 3. Porous layer; 4. Heat exchange layer; 5. Through hole; 6. Heat exchange tank.

Implementation

The technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the application; obviously, the described embodiments are only some of the embodiments of the application, not all of them, based on The embodiments in the present application and all other embodiments obtained by persons of ordinary skill in the art without creative efforts belong to the protection scope of the present application.

In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the orientations shown in the drawings Or positional relationship is only for the convenience of describing the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "set with", "set/connected", "connected", etc. should be understood in a broad sense, such as " Connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal connection between two components. connectivity. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

Example

Referring to Fig. 1, it is a composite high-flux tube disclosed by the present invention, which includes a heat exchange tube body 1, the inner and outer surfaces of the heat exchange tube body 1 are provided with a polymer layer 2, and the outer wall of the heat exchange tube body 1 is provided with The porous layer 3 is provided with a heat exchange layer 4 on the inner wall of the heat exchange tube body 1 , and the heat exchange layer 4 is provided with several through holes 5 along its axial direction. In this embodiment, the number of through holes 5 is preferably set to eight.

Wherein, referring to Fig. 2, a plurality of heat exchange grooves 6 are uniformly opened on the inner wall of the through hole 5 along the axial direction of the heat exchange tube body 1, and the number of heat exchange grooves 6 is 60-70. The number of heat tanks 6 is preferably 65, and the groove depth of the heat exchange tank 6 is 0.6-0.9 mm. In this embodiment, the groove depth of the heat exchange tank 6 is preferably 0.75 mm, and the thickness of the polymer layer 2 is 0.03-0.08 mm. mm. In this embodiment, the thickness of the polymeric layer 2 is preferably 0.05 mm. The polymeric layer 2 is any one of copper-based solder, zinc-aluminum-based solder, aluminum-based solder, cobalt-based solder, and silver-based solder. In this embodiment, the polymeric layer 2 is preferably copper-based solder .

The thickness of the porous layer 3 is 0.8-1.2mm, in the present embodiment, the thickness of the porous layer 3 is preferably 1.0mm; the porosity is 70-75%, in the present embodiment, the porosity is preferably 72%, the equivalent diameter is 70 to 80 μm, and in this embodiment, the equivalent diameter is preferably 75 μm. The outer diameter of the heat exchange tube is 30 mm, the wall thickness is 1.5 mm, and the heat exchange tube is a steel pipe.

For this composite high-flux tube, a layer of polymer layer 2 is provided between the inner wall and the outer wall of the heat exchange tube body 1, which effectively increases the bonding force of the inner and outer tubes, and can effectively solve the problem of thermal conductivity of general bimetallic tubes. Bad problem, and the outer side of the heat exchange tube body 1 is provided with a porous layer 3, and the inner side is provided with a plurality of through holes 5, and the inner wall of each through hole 5 is evenly opened with a plurality of heat exchange grooves 6, which further increases the The heat exchange area of the composite high-flux tube greatly improves the heat exchange efficiency.

Example

According to the above-mentioned production process of a composite high-flux tube, the steps are as follows:

Step 1. When cleaning the heat exchange tubes, first blast the outer surface of the steel pipe with a sandblasting machine, and then polish the outer surface of the steel pipe to remove floating rust on the outer surface of the steel pipe, so that the outer surface of the steel pipe Smooth, then degrease the outer surface of the steel pipe with detergent to make the outer surface of the steel pipe free of oil, then dry the steel pipe to make the outer surface of the steel pipe dry, free of oil and rust, and then proceed to the next step of processing ;

Step 2. When preparing the coating material, the main material of the coating material is reduced iron powder of 400 mesh to 600 mesh, and the solder powder is mixed with 5% to 10% of the weight ratio of the reduced iron powder. In the reduced iron powder, stir the reduced iron powder and solder powder evenly, add glue and metal solder, and make the reduced iron powder and solder powder form a liquid binder mixture through the glue and metal solder;

Step 3. When applying the binder mixture on the inner and outer surfaces of the steel pipe, ensure that the steel pipe is in a state of uniform rotation, and apply the binder mixture evenly on the outer surface of the steel pipe through a spray gun or a brush, and then use a spray gun to coat When the spray gun is moving at a constant speed, and the flow rate of the adhesive mixture sprayed by the spray gun is kept constant, when the adhesive mixture is coated with a brush, the adhesive mixture is evenly coated on the steel pipe through the brush. The inner and outer surfaces, so that the outer surface of the steel pipe forms an adhesive polymer layer 2 with a uniform thickness;

Step 4. When the binder mixture is evenly coated on the inner and outer surfaces of the steel pipe and then dried, the steel pipe is kept in a state of uniform rotation and dried by natural drying;

Step 5. After the binder mixture is dried on the outer surface of the steel pipe, the outer surface of the steel pipe is squeezed through the mold, so that the binder mixture is stressed, and then the binder mixture forms a layer on the outer surface of the steel pipe. Uniform and tight coating layer;

Step 6. When the hole is made by the ultrasonic hole making machine, the steel pipe is rotating at a constant speed and moving forward at a constant speed and passes through the ultrasonic hole making machine, and the frequency of the ultrasonic hole making machine is kept consistent. holes, and control the porosity of the holes on the coating layer through the frequency of the ultrasonic hole maker;

Step 7. Install the heat exchange tube on the punching machine, use the punching machine to punch out multiple through holes 5 with multiple heat exchange slots 6 on the inner wall in the interlayer of the heat exchange tube, and then insert the heat exchange tube coaxially into the heat exchange tube In the tube body 1, the outer wall of the heat exchange tube is attached to the inner wall of the heat exchange tube body 1 to form a transition fit;

Step 8. When performing composite sintering on the steel pipes that have been made holes, place the steel pipes in a sintering furnace. The temperature of the sintering furnace is controlled between 400 degrees Celsius and 500 degrees Celsius. During sintering, the steel pipes are in a state of uniform rotation, so that The coating layer forms a porous layer 3 on the outer surface of the steel pipe, and at the same time makes the inner wall of the heat exchange tube body 1 form a heat exchange layer 4 .

After Step 8 is completed, the inner and outer walls of the composite high-flux tube are subjected to secondary grinding and polishing treatment to obtain a finished product.

For the production process of this composite high-flux pipe, the porosity can be effectively controlled during the hole-making process through the ultrasonic pore-making method, so that the porous layer 3 on the surface of the steel pipe tends to be consistent, ensuring that when the porous layer 3 is processed , the specification of porosity is easy to control and improve the actual use efficiency. In this process, compounding and sintering are turned into one process, so only one heat treatment process is required, which saves the process, not only improves the production efficiency, but also greatly saves the production cost.

The embodiments of this specific implementation mode are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention, so: all equivalent changes made according to the structure, shape and principle of the present invention should be covered by within the protection scope of the present invention.

Claims (10)

1. The utility model provides a compound high flux pipe, includes heat exchange tube body (1), its characterized in that, the inside and outside surface of heat exchange tube body (1) all is equipped with polymeric layer (2), be provided with porous layer (3) on the lateral wall of heat exchange tube body (1), be provided with heat exchange layer (4) on the inside wall of heat exchange tube body (1), heat exchange layer (4) are provided with a plurality of through-hole (5) along its axial.

2. The composite high-flux tube according to claim 1, wherein a plurality of heat exchange grooves (6) are uniformly formed in the inner wall of the through hole (5) along the axial direction of the heat exchange tube body (1).

3. A composite high flux tube according to claim 2, wherein the number of heat exchange slots (6) is 60-70.

4. A composite high flux tube according to claim 2, wherein the heat exchange groove (6) has a groove depth of 0.6-0.9mm.

5. The composite high flux tube of claim 1, wherein the polymeric layer (2) has a thickness of 0.03-0.08mm.

6. The composite high flux tube of claim 1, wherein the polymeric layer (2) is any one of copper-based solder, zinc-aluminum-based solder, cobalt-based solder, silver-based solder.

7. The composite high flux tube of claim 1, wherein the porous layer (3) has a thickness of 0.8-1.2mm, a porosity of 70-75% and an equivalent diameter of 70-80 μm.

8. The composite high-flux tube of claim 1, wherein the heat exchange tube has an outer diameter of 30mm and a wall thickness of 1.5mm, and wherein the heat exchange tube is a steel tube.

9. The process for producing a composite high flux tube according to any one of claims 1 to 8, comprising the steps of:

firstly, when a heat exchange tube is cleaned, sand blasting is carried out on the outer surface of the steel tube through a sand blasting machine, then polishing treatment is carried out on the outer surface of the steel tube, floating rust on the outer surface of the steel tube is removed, the outer surface of the steel tube is smooth, degreasing treatment is carried out on the outer surface of the steel tube through a detergent, the outer surface of the steel tube is free of greasy dirt, drying treatment is carried out on the steel tube, and the outer surface of the steel tube is dry, free of greasy dirt and free of floating rust, and then the next processing is carried out;

step two, when preparing a coating material, adopting 400-600 mesh reduced iron powder as a main material of the coating material, adding 5% -10% of soldering tin powder according to the weight ratio of the reduced iron powder, adding the soldering tin powder into the reduced iron powder, uniformly stirring the reduced iron powder and the soldering tin powder, adding glue and metal brazing filler metal, and enabling the reduced iron powder and the soldering tin powder to form a liquid binder mixture through the glue and the metal brazing filler metal;

step three, when the adhesive mixture is coated on the inner surface and the outer surface of the steel pipe, the steel pipe is guaranteed to be in a uniform rotation state, the adhesive mixture is uniformly coated on the outer surface of the steel pipe through a spray gun or a brush, when the spray gun is used for coating, the spray gun is in a uniform movement state, the flow rate of the adhesive mixture sprayed out of the spray gun is kept fixed, when the brush is used for coating the adhesive mixture, the adhesive mixture is uniformly coated on the inner surface and the outer surface of the steel pipe through the brush, and an adhesive polymerization layer (2) with the same thickness is formed on the outer surface of the steel pipe;

step four, when the adhesive mixture is uniformly coated on the inner surface and the outer surface of the steel pipe and then dried, the steel pipe is kept in a uniform rotation state and is dried in a natural drying mode;

step five, extruding the outer surface of the steel pipe through a die after the adhesive mixture is dried on the outer surface of the steel pipe, so that the adhesive mixture is stressed, and a coating layer with uniform and compact texture is formed on the outer surface of the steel pipe by the adhesive mixture;

step six, when the ultrasonic pore-forming machine is used for pore-forming, the steel pipe is in a state of uniform rotation and uniform advance, passes through the ultrasonic pore-forming machine, keeps the frequency of the ultrasonic pore-forming machine consistent, performs pore-forming on the coating layer through the ultrasonic wave of the ultrasonic pore-forming machine, and controls the pore-forming porosity on the coating layer through the frequency of the ultrasonic pore-forming machine;

step seven, mounting the heat exchange tube on a puncher, punching a plurality of through holes (5) with a plurality of heat exchange grooves (6) on the inner wall in an interlayer of the heat exchange tube by using the puncher, coaxially inserting the heat exchange tube into the heat exchange tube body (1), and attaching the outer wall of the heat exchange tube to the inner wall of the heat exchange tube body (1) to form transition fit;

and step eight, when the steel pipe subjected to hole forming is subjected to composite sintering, the steel pipe is placed in a sintering furnace, the temperature of the sintering furnace is controlled to be 400-500 ℃, and when the steel pipe is sintered, the steel pipe is in a uniform rotation state, so that a porous layer (3) is formed on the outer surface of the steel pipe by the coating layer, and meanwhile, a heat exchange layer (4) is formed on the inner wall of the heat exchange pipe body (1).

10. The process according to claim 9, wherein after the step eight is completed, the inner wall and the outer wall of the composite high-throughput tube are subjected to secondary grinding and polishing treatment to obtain a finished product.