WO2019080625A1

WO2019080625A1 - Heat exchanger, gas turbine, boiler, and heat exchanger preparation method

Info

Publication number: WO2019080625A1
Application number: PCT/CN2018/101897
Authority: WO
Inventors: 靳普
Original assignee: 至玥腾风科技投资集团有限公司
Priority date: 2017-10-25
Filing date: 2018-08-23
Publication date: 2019-05-02
Also published as: CN107621180A

Abstract

Disclosed are a heat exchanger, a gas turbine, a boiler, and a heat exchanger preparation method, wherein the heat exchanger comprises a first tube (1), a second tube (2) and a heat exchange element (3), the outer diameter of the first tube (1) is smaller than the inner diameter of the second tube (2), and the second tube (2) is sheathed on the outside of the first tube (1); a plurality of heat exchange elements (3) are attached on an inner tube wall of the first tube (1) and between an outer tube wall of the first tube (1) and an inner tube wall of the second tube (2), and a gap is provided between any two adjacent heat exchange elements (3); and the space between the outer tube wall of the first tube (1) and the inner tube wall of the second tube (2) forms a first medium channel, and the space surrounded by the first tube (1) forms a second medium channel.

Description

Heat exchanger, gas turbine, boiler and heat exchanger preparation method

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. JP-A No. No. No. No. No. No. No. No.

Technical field

The present disclosure relates to the field of heat exchanger technology, and in particular, to a heat exchanger, a gas turbine, a boiler, and a heat exchanger preparation method.

Background technique

A gas turbine is a power machine that converts thermal energy into mechanical energy by using a continuous flow of high-temperature and high-pressure gas as a working medium. The exhaust gas discharged from the gas turbine still has a high temperature and pressure. In order to improve the thermal efficiency of the gas turbine, heat energy of the part of the gas needs to be recovered by the heat exchanger. Due to the high exhaust gas temperature of the gas turbine, the exhaust pipe is subjected to a large thermal stress and a large thermal deformation. Therefore, the heat exchanger required for the gas turbine should have a high heat exchange efficiency and a small pressure loss. It should also have high structural stability and fatigue resistance.

Similarly, a gas-fired combined cycle power plant is a power station that uses a combination of a gas turbine, a waste heat boiler, and a steam turbine to complete power generation. The gas turbine drives the generator through a combination of gas combustion and a combination of a compressor and a turbine, and the waste heat boiler utilizes a gas turbine. The discharged high-temperature residual gas generates high-temperature and high-pressure steam, and the steam turbine uses the steam from the waste heat boiler to drive the generator, which requires the heat exchanger to complete the heat exchange between the high-temperature residual gas discharged from the gas turbine and the water in the boiler in a short time.

At present, the main structural forms of heat exchangers are tube-fin heat exchangers, plate-fin heat exchangers and plate heat exchangers, among which tube-heat exchangers have low heat exchange efficiency; plate-fin heat exchangers are Before and after heat exchange, there is a large pressure loss in the heat exchange medium; while the processing technology of the plate heat exchanger is more complicated and its structural stability is poor. It can be seen that the existing heat exchanger can not meet the demand of the gas turbine in the heat exchange of the exhaust gas and the heat exchange between the high temperature residual gas in the boiler and the water in the boiler.

Summary of the invention

The present disclosure provides a heat exchanger, a gas turbine, a boiler and a heat exchanger preparation method to solve the problem that the heat exchanger cannot meet the gas turbine heat exchange in the exhaust gas and the heat exchange between the high temperature residual gas in the boiler and the water in the boiler.

In a first aspect, the present disclosure provides a heat exchanger including a first tube body, a second tube body, and a heat exchange element, wherein an outer diameter of the first tube body is smaller than an inner diameter of the second tube body, The second pipe body is sleeved outside the first pipe body;

A plurality of heat exchange elements are attached between the inner wall of the pipe of the first pipe body and the pipe outer wall of the first pipe body and the inner wall of the pipe body of the second pipe body, between any two adjacent heat exchange elements Both are provided with a gap;

A space between the outer tube wall of the first tube body and the inner tube wall of the second tube body forms a first medium passage, and a space surrounded by the first tube body forms a second medium passage.

Optionally, a gap is disposed between any two adjacent heat exchange elements in an axial direction and a radial direction along the first pipe body.

The heat exchange element has a regular structure or an irregular structure.

Optionally, when the shape of the heat exchange element is a regular structure, the heat exchange element is a corrugated plate, a fin plate or a shape of a water droplet in a shape of a flow direction of the heat exchange element;

When the heat exchange element has an irregular shape, the heat exchange element has a corrugated shape or a burr shape.

Optionally, the height of the heat exchange element along the radial direction of the tube body ranges from 0.01 micrometers to 1 micrometer.

Optionally, the heat exchanger further includes N tubes, and the N tubes are sequentially sleeved on the second tube according to an inner diameter from small to large, and the N is greater than or equal to 1. Positive integer

A plurality of heat exchange elements are attached between the inner wall of the pipe of the adjacent pipe body and the outer wall of the pipe.

Optionally, the gap between two adjacent tubes is 0.01 micrometers to 2 millimeters.

Optionally, the gap between adjacent tubes is 0.01 micron to 0.5 mm.

In a second aspect, the present disclosure further provides a gas turbine comprising a gas turbine body, an exhaust pipe, an intake pipe, and any one of the heat exchangers provided by the first aspect of the disclosure, wherein the exhaust pipe is disposed on the gas turbine body The exhaust pipe is connected to the first pipe body of the heat exchanger, and the intake pipe is connected to the second pipe body of the heat exchanger.

In a third aspect, the present disclosure also provides a boiler, comprising: a furnace body, a condensation line, a first heat exchanger and a second heat exchanger, wherein the first heat exchanger and the second heat exchanger are In one embodiment, the exhaust pipe of the high temperature gas device is connected to the first pipe of the first heat exchanger, and the outlet of the condensing pipe and the second heat exchange The first tube body of the device is connected, and the water in the furnace body is respectively connected to the second tube body of the first heat exchanger and the second tube body of the second heat exchanger.

In a fourth aspect, the present disclosure further provides a heat exchanger preparation method, including:

Applying and/or spraying the adhering substance to the outer wall of the tube and the inner wall of the tube;

Spraying a metal liquid on the outer wall of the tube and the inner wall of the tube to infiltrate the metal liquid and fill the pores of the attached substance;

Before the solidification of the metal liquid, the second tube body is placed outside the first tube body, and the metal liquid of the outer wall of the first tube is solidified and then connected to the outer wall of the first tube and the inner wall of the second tube, respectively. The outer diameter of the first pipe body is smaller than the inner diameter of the second pipe body;

After the metal liquid is deposited and cooled, the attached material is washed away to obtain a heat exchange element having an outer shape or an irregular structure.

Optionally, the specific step of applying and/or spraying the adhering substance to the outer wall of the tube and the inner wall of the tube of the first tube body is: the attached substance pre-positions the shape of the heat exchange element on the mold, and the attached substance falls on the tube wall After that, the original mold occupies the cavity left after the drawing, that is, the shape of the heat exchange element.

Optionally, the molten metal contains flake graphite powder, ceramic powder or diamond powder.

Optionally, the adhering substance comprises at least one of gypsum, plastic, resin or clay.

Optionally, the attachment substance is in the form of granules or powder, and the attachment substance has a diameter ranging from 0.01 micrometers to 2 millimeters.

Optionally, the method further includes:

N tubes are sequentially sleeved on the second tube according to an inner diameter from small to large, and the N is a positive integer greater than or equal to 1;

Applying and/or spraying an adhering substance between the inner wall of the tube and the outer wall of the tube of the adjacent ones of the N tubes;

Spraying a metal liquid between the inner wall of the tube and the outer wall of the tube of the adjacent ones of the N tubes to infiltrate the metal liquid and fill the pores of the attached substance;

After the metal liquid is deposited and cooled and formed, the adhering substance is washed away, so that the inner wall of the adjacent tube body and the outer wall of the tube of the N tubes are formed into a regular structure or an irregular structure. Thermal component.

In the present disclosure, a plurality of heat exchange elements are attached between the inner wall of the pipe of the first pipe body and the outer wall of the pipe of the first pipe body and the inner wall of the pipe body of the second pipe body, in particular, the outer shape is irregular. A number of heat exchange elements, on the one hand, make the heat exchanger have a higher specific surface area, increase the heat exchange area of the heat exchanger, and improve the heat exchange efficiency of the heat exchanger; on the other hand, the heat exchange element has a low height The diameter is small, especially when the shape of the heat exchange element is a drop shape in the direction of flow, the air flow resistance can be reduced, thereby reducing the pressure loss during the flow of the medium; in addition, the formation of the heat exchange element is formed by chemical molding. The heat exchanger has high processability, is easy to process, has low cost, can be mass-produced, and has high structural stability of the heat exchanger. It can be seen that the heat exchanger of the present disclosure can meet the requirement of the gas turbine in the heat exchange of the exhaust gas and the heat exchange between the high temperature residual gas in the boiler and the water in the boiler.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings used in the description of the embodiments of the present disclosure will be briefly described. It is obvious that the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings may be obtained from these drawings without the inventive labor.

1 is a schematic structural view of a heat exchanger including two tubes provided by an embodiment of the present disclosure;

Figure 2 is a schematic structural view of the A-A direction of Figure 1;

Figure 3 is an enlarged schematic view of a portion B of Figure 1;

4 is a schematic view showing the flow of a heat exchange element in a flow direction in the direction of flow in the embodiment of the present disclosure;

5 is a schematic structural view of a heat exchanger including four tubes provided by an embodiment of the present disclosure;

Figure 6 is a cross-sectional view of Figure 4;

7 is a schematic structural view of a boiler having a heat exchanger according to an embodiment of the present disclosure;

FIG. 8 is a schematic flow chart of a method for preparing a heat exchanger according to an embodiment of the present disclosure.

Detailed ways

The technical solutions in the embodiments of the present disclosure are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present disclosure. It is obvious that the described embodiments are a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the disclosure.

As shown in FIG. 1 to FIG. 4, a heat exchanger includes a first pipe body 1, a second pipe body 2 and a heat exchange element 3. The outer diameter of the first pipe body 1 is smaller than the inner diameter of the second pipe body 2, The second pipe body 2 is sleeved on the outside of the first pipe body 1; a plurality of heat exchanges are attached between the pipe inner wall of the first pipe body 1 and the pipe outer wall of the first pipe body 1 and the pipe inner wall of the second pipe body 2 The element 3, any two adjacent heat exchange elements 3 are provided with a gap therebetween; the space between the outer wall of the tube of the first tube body 1 and the inner wall of the tube of the second tube body 2 forms a first medium passage, the first tube The space enclosed by the body forms a second medium passage.

The heat exchanger of the embodiment of the present disclosure may be applied to, but not limited to, a gas turbine or a preheating boiler, and the heat exchanger forms two passages for the flow of the heat exchange medium through the two sleeved tubes, and the structure thereof is very simple, and The resistance generated during the flow of the heat exchange medium is smaller than that of the prior art, and the heat exchange efficiency is higher than that of the prior art.

Here, the first medium passage and the second medium passage are two passages for the heat exchange medium to flow, wherein the heat exchange medium may be a plurality of forms of medium, for example, the heat exchange medium flowing in the first medium passage may be The liquid may also be a gas, and the heat exchange medium flowing in the second medium passage may be a liquid or a gas; in addition, the first medium passage may be used for the high temperature medium, and the second medium passage may be used for the low temperature medium to flow; The first medium channel is for the low temperature medium to flow, and the second medium channel is for the high temperature medium to flow.

In the embodiment of the present disclosure, a plurality of heat exchange elements 3 are attached to the inner wall of the first pipe body 1 and the outer wall of the pipe body of the first pipe body 1 and the inner wall of the pipe body of the second pipe body 2, which can be understood as, on the one hand, The first pipe body 1 and the second pipe body 2 are connected and fixed by the heat exchange element 3 to form a structurally stable heat exchanger; on the other hand, when the hot gas flows in the second medium passage, the heat carried in the hot gas can pass The plurality of heat exchange elements 3 on the inner wall of the first pipe body 1 are more quickly conducted to the first pipe body 1 and then through the pipe outer wall of the first pipe body 1 and the inner wall of the pipe body of the second pipe body 2 Several heat exchange elements 3 absorb heat from the cold air. It can be seen that several heat exchange elements 3 can increase the heat exchange area of the heat exchanger in the first medium passage and the second medium passage, and can improve the heat exchange efficiency of the heat exchanger.

As shown in FIG. 1 , the heat exchanger is applied to a gas turbine as an example, and the second medium passage is a passage for exhaust gas (ie, hot air) discharged from the gas turbine, and the first medium passage is a passage for the cooling air to flow. The specific heat exchange process is as follows: the hot gas flows in the direction of the arrow in the second medium passage, and the cold air flows in the direction of the other arrow in the first medium passage, and the flow direction of the hot air and the cold air is opposite, in the hot air and The heat exchange is performed by the first pipe body 1 and the plurality of heat exchange elements 3 during the flow of the cold air. At this time, the heat carried in the hot gas is conducted to the heat exchange element 3 through the first pipe body 1, and the contact of the cold air flowing in the first medium passage with the heat exchange element 3 absorbs the heat.

It should be noted that the heat exchange element 3 has an irregular shape, and the heat exchange medium can freely flow in the circulation passage, thereby reducing the flow resistance and reducing the pressure loss caused by the flowing medium; The high specific surface area can greatly improve the heat exchange area of the heat exchanger, thereby improving the heat exchange efficiency of the heat exchanger; in addition, due to the high heat exchange efficiency, the structure of the heat exchanger can be more compact.

Optionally, a gap is provided between any two adjacent heat exchange elements 3 in the axial direction and the radial direction along the first pipe body 1.

In order to further reduce the flow resistance of the heat exchanger, a gap is provided between any two adjacent heat exchange elements 3 in the axial direction and the radial direction along the first pipe body 1, so that the heat exchange medium is in circulation The channel can flow more freely and freely, further reducing the pressure loss caused by the heat exchanger to the flowing medium.

Optionally, the heat exchange element 3 has a regular structure or an irregular structure.

Specifically, when the outer shape of the heat exchange element 3 is a regular structure, the heat exchange element 3 may be a corrugated plate, a fin plate or a water droplet shape in which the shape of the heat exchange element is in the direction of flow. Here, as shown in FIG. 4, if the shape of the heat exchange element is in the shape of a droplet in the direction of flow, the flow resistance of the heat exchanger can be further reduced.

When the heat exchange element 3 has an irregular shape, the heat exchange element 3 may have a corrugated shape or a burr shape.

Optionally, the first pipe body 1 and the second pipe body 2 are disposed on the same central axis.

In the embodiment of the present disclosure, by arranging the first pipe body 1 and the second pipe body 2 on the same central axis, the structural stability of the heat exchanger can be improved, and the flow medium can be ensured to flow uniformly in the circulation passage.

Optionally, the heat exchange element 3 has an irregular coral shape.

Here, the irregular coral shape can be understood as the appearance of the heat exchange element 3 with irregular projections and depressions, which are similar in appearance to corals. Thus, the embodiments of the present disclosure can further increase the heat exchange area, thereby further improving the heat exchange efficiency of the heat exchanger.

Alternatively, the heat exchange element 3 is a metal heat exchange element, and the heat transfer element 3 has a thermal conductivity greater than or equal to 200 watts per meter Kelvin.

In the embodiment of the present disclosure, the heat exchange element 3 should be a metal heat exchange element having a high thermal conductivity, for example, a thermal conductivity greater than or equal to 200 watts / (meter Kelvin), and the selected metal material may be, for example, stainless steel, aluminum or Copper and so on. On this basis, the selected metal material should also be resistant to high temperatures, preferably stainless steel. In this way, the heat exchanger is not easily damaged, thereby increasing the service life of the heat exchanger.

Optionally, the height of the heat exchange element 3 in the radial direction of the tube body ranges from 0.01 micrometers to 1 micrometer.

For example, the height of the heat exchange element 3 in the radial direction of the first pipe body 1 may range from 0.01 micrometers to 1 micrometer. For example, the length of the heat exchange element 3 in the circumferential direction of the first pipe body 1 is 0.05 μm. In this way, the pressure loss of the heat exchanger to the flowing medium can be further reduced by the micron-sized heat exchange elements.

Optionally, the cross-sectional area of the first medium passage is equal to the cross-sectional area of the second medium passage.

In the embodiment of the present disclosure, the cross-sectional areas of the two medium passages are set to be equal, so that the flow volumes of the two heat exchange mediums are substantially equal, which is advantageous for the two heat exchange mediums to more easily achieve heat balance during heat exchange.

Optionally, the heat exchanger further comprises N tubes, the N tubes are sequentially arranged according to the inner diameter from small to large, and the N tubes are sleeved on the second tube, and N is greater than or equal to 1. Integer; a plurality of heat exchange elements 3 are attached between the inner wall of the pipe of the adjacent pipe body and the outer wall of the pipe.

Figures 5 and 6 show the case where N is 2, i.e., the heat exchanger comprises a total of four tubes. When the heat exchanger includes four tubes, four medium passages can be formed, and the four medium passages are used to alternately supply hot air and cold air, respectively. Thus, the first medium passage is increased from the original one to two, and the second medium passage is also increased from the original one to two. The heat exchanger of the embodiment of the present disclosure can further improve the heat exchange effect due to an increase in the number of medium passages.

It should be noted that the heat exchanger may further comprise three tubes or five tubes, etc., and can be flexibly set according to the specific working conditions of the heat exchanger.

It should be noted that, for the gap between adjacent two tubes, the distance between 0.01 micrometers and 2 millimeters, the existing installation methods such as welding cannot be realized, and the preparation of the heat exchanger claimed in the embodiments of the present disclosure is required. The method is suitable for the fixed installation of heat exchange elements in such small size gaps.

Further, the gap between adjacent tubes is 0.01 micrometers to 0.5 millimeters.

When the gap between two adjacent tubes is not more than 0.5 mm, the flow of air between the two tubes will produce a boundary layer effect, which will force air to flow between the tubes in a laminar flow, thus reducing Three-dimensional flow such as turbulence or eddy current, thereby reducing pressure loss caused by flow resistance.

The rest can refer to the embodiment of the invention shown in FIG. 1 to FIG. 4, and have the same technical effects. To avoid repetition, no further details are provided herein.

In another aspect, an embodiment of the present disclosure further relates to a gas turbine including a gas turbine body, an exhaust pipe, an intake pipe, and any one of the heat exchangers of the embodiments of the present disclosure, the exhaust pipe being disposed on the gas turbine body, and the exhaust pipe Connected to a first tube of the heat exchanger, the inlet tube being coupled to the second tube of the heat exchanger.

Optionally, when the heat exchanger further comprises N tubes, the exhaust pipe is in communication with all first medium passages of the heat exchanger, and the intake pipe is in communication with all second medium passages of the heat exchanger.

In the embodiment of the present disclosure, the heat exchanger is used to recover the exhaust heat of the gas turbine, which can reduce the fuel consumption, improve the efficiency and specific work of the gas turbine, and thereby improve the working performance of the gas turbine.

It should be noted that all the embodiments of the heat exchanger can be implemented in combination with the gas turbine, and have the same technical effects. To avoid repetition, no further details are provided herein.

As shown in FIG. 7 , an embodiment of the present disclosure further relates to a boiler, particularly a waste heat boiler, including a furnace body 4, an overpressure steam line 5, a condensing line 6, a first heat exchanger 7, and a second heat exchanger. 8. The furnace body 4 is filled with water, the first heat exchanger 7 and the second heat exchanger 8 are immersed in the water in the furnace body 4, and the second heat exchanger 7 and the second pipe body of the second heat exchanger 8 are both connected to the furnace body. The water inside 4 is connected. The furnace body 4 and the overpressure steam line 5 are integrally formed, and the two ends of the overpressure steam line 5 are respectively communicated with the high temperature steam inlets of the furnace body 4 and the steam turbine 10, and the two ends of the condensing line 6 are respectively associated with the inside of the furnace body 4. The first tube of the second heat exchanger 8 is in communication with the low temperature steam outlet of the steam turbine, and the first tube body of the first heat exchanger 7 is in communication with the exhaust pipe of the gas turbine 9 and the atmosphere, respectively.

The working process of the embodiment of the present disclosure is as follows:

The high temperature gas discharged from the gas turbine 9 through the exhaust pipe enters the first pipe body of the first heat exchanger 7 and exchanges heat with the water between the first pipe body and the second pipe body through the heat exchange element 3, and the high temperature gas temperature after heat exchange Dropped to a predetermined value and discharged into the atmosphere, the water between the first pipe body and the second pipe body is rapidly heated to become high-temperature steam, and enters the high-temperature steam inlet of the steam turbine 10 through the overpressure steam line 5, which is the work of the steam turbine 10. After the power is supplied, low temperature steam is formed, and the low temperature steam is sequentially introduced into the first pipe body of the condensation pipe 6 and the second heat exchanger 8 from the low temperature steam outlet of the steam turbine 10, and the heat exchange element and the second heat exchange through the second pipe body The water exchange between the first tube body and the second tube body of the device, after the heat exchange, the temperature of the water in the first tube body and the second tube body is increased, the heat required to become water vapor is reduced, and the low temperature steam is converted into Water enters the next work cycle.

As shown in FIG. 8, a heat exchanger preparation method includes:

S1, applying and/or spraying the adhering substance to the outer wall of the tube of the first pipe body and the inner wall of the pipe.

Wherein, the specific step of applying and/or spraying the adhering substance to the outer wall of the tube and the inner wall of the tube of the first tube body is: the attached substance pre-positions the shape of the heat exchange element on the mold, and when the attached substance falls on the tube wall, the original mold The cavity left after the place-taking is the shape of the heat exchange element.

It should be noted that the above-mentioned adhering substance is used for pre-filling, and therefore, the adhering substance should be a substance which can be washed away by a chemical reagent. Optionally, the adhering substance comprises at least one of gypsum, plastic, resin or clay. Further, the adhering substance is in the form of granules or powder, and the diameter of the attached substance ranges from 0.01 μm to 2 mm.

S2, spraying a metal liquid on the outer wall of the tube of the first tube body and the inner wall of the tube to infiltrate the metal liquid and fill the pores of the attached substance.

Optionally, the metal liquid contains flake graphite powder, ceramic powder or diamond powder.

In order to further improve the heat exchange efficiency of the heat exchanger, the flake graphite powder, the ceramic powder or the diamond powder may be added to the metal liquid. Among them, taking graphite powder as an example, the specific steps are as follows: rubbing the pyrolytic graphite into which the defect is introduced, the surface of the bulk graphite will produce flake-like crystals, and the flake-like crystals contain a single layer of graphene. A sufficient amount of the flake-like crystals is uniformly mixed into the metal liquid. Thus, it is cooled and formed into a metal-graphene composite material in S4, and its thermal conductivity can be on the order of 103 watts/(m·Kelvin).

S3, before the solidification of the metal liquid, placing the second tube body outside the first tube body, and solidifying the metal liquid of the outer wall of the first tube and connecting the outer wall of the first tube and the inner wall of the second tube respectively, the first tube body The outer diameter is smaller than the inner diameter of the second tube body.

Optionally, the first tube body and the second tube body are kept in the same axis by the tooling, and the second tube body is placed outside the first tube body.

S4. After the metal liquid is deposited and cooled, the attached material is washed away to obtain a heat exchange element having a regular structure or an irregular structure.

Optionally, the heat exchanger further includes N tubes, and the N tubes are sequentially sleeved on the second tube according to an inner diameter from small to large, and the N is greater than or equal to 1. a positive integer; the method further includes:

Applying and/or spraying the adhering substance to the outer wall of the inner tube of the adjacent two tubes;

Spraying a metal liquid on the outer wall of the inner tube to infiltrate the metal liquid and filling the pores of the attached substance;

Before the solidification of the metal liquid, the outer tube of the two adjacent tubes is placed outside the inner tube, and the metal liquid of the outer wall of the inner tube is solidified and then connected to the outer wall of the inner tube and the outer tube. The inner wall of the outer tube;

After the metal liquid is deposited and cooled and formed, the adhering substance is washed away to form a heat exchange element having a regular structure or an irregular structure between the outer tube wall of the inner tube and the inner wall of the outer tube. .

In the embodiment of the present disclosure, the heat exchange element is prepared by chemical molding, and has the advantages of good processability, easy processing, low cost, good stability, and mass production. It can be seen that the preparation of the heat exchanger has high processability, and the structural stability of the heat exchanger is good.

It should be noted that the heat exchanger prepared by the heat exchanger preparation method provided by the embodiment of the present disclosure can achieve the technical effect of any heat exchanger in the embodiment of the present disclosure.

The above is only the specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the disclosure, and should cover It is within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosure should be determined by the scope of the claims.

Claims

A heat exchanger comprising a first tube body, a second tube body and a heat exchange element, wherein an outer diameter of the first tube body is smaller than an inner diameter of the second tube body, and the second tube body is sleeved in the The outside of the first pipe body;

A plurality of heat exchange elements are attached between the inner wall of the pipe of the first pipe body and the pipe outer wall of the first pipe body and the inner wall of the pipe body of the second pipe body, between any two adjacent heat exchange elements Both are provided with a gap;

A space between the outer tube wall of the first tube body and the inner tube wall of the second tube body forms a first medium passage, and a space surrounded by the first tube body forms a second medium passage.
The heat exchanger according to claim 1, wherein a gap is provided between any two adjacent heat exchange elements in the axial direction and the radial direction of the first pipe body.
The heat exchanger according to claim 1 or 2, wherein the heat exchange element has a regular structure or an irregular structure.
The heat exchanger according to claim 3, wherein when the shape of the heat exchange element is a regular structure, the heat exchange element is a corrugated plate, a fin plate or a water droplet shape in a shape of an upstream direction of the heat exchange element;

When the heat exchange element has an irregular shape, the heat exchange element has a corrugated shape or a burr shape.
The heat exchanger according to claim 1 or 2, wherein the heat exchange element has a height in a radial direction of the tube body ranging from 0.01 μm to 1 μm.
The heat exchanger according to claim 1 or 2, wherein the heat exchanger further comprises N tubes, and the N tubes are sequentially sleeved to the second tube in an order of inner diameter from small to large. In the above, the N is a positive integer greater than or equal to 1;

A plurality of heat exchange elements are attached between the inner wall of the pipe of the adjacent pipe body and the outer wall of the pipe.
The heat exchanger according to claim 1 or 2, wherein a gap between adjacent two tubes is 0.01 μm to 2 mm.
The heat exchanger according to claim 7, wherein a gap between adjacent two tubes is from 0.01 μm to 0.5 mm.
A gas turbine comprising a gas turbine body, an exhaust pipe, an intake pipe, and a heat exchanger according to any one of claims 1 to 8, wherein the exhaust pipe is disposed on the gas turbine body, the exhaust pipe Connected to the first tube of the heat exchanger, the inlet tube being connected to the second tube of the heat exchanger.
A boiler comprising a furnace body, a condensing line, a first heat exchanger and a second heat exchanger, wherein the first heat exchanger and the second heat exchanger are according to any one of claims 1 to a heat exchanger, an exhaust pipe that generates a high-temperature gas device is connected to the first pipe body of the first heat exchanger, and an outlet of the condensation pipe is connected to the first pipe body of the second heat exchanger, The water in the furnace body is respectively connected to the second pipe body of the first heat exchanger and the second pipe body of the second heat exchanger.
A heat exchanger preparation method comprising:

Applying and/or spraying the adhering substance to the outer wall of the tube and the inner wall of the tube;

Spraying a metal liquid on the outer wall of the tube and the inner wall of the tube to infiltrate the metal liquid and fill the pores of the attached substance;

Before the solidification of the metal liquid, the second tube body is placed outside the first tube body, and the metal liquid of the outer wall of the first tube is solidified and then connected to the outer wall of the first tube and the inner wall of the second tube, respectively. The outer diameter of the first pipe body is smaller than the inner diameter of the second pipe body;

After the metal liquid is deposited and cooled, the attached material is washed away to obtain a heat exchange element having a regular structure or an irregular structure.
The method according to claim 11, wherein the step of applying and/or spraying the adhering substance to the outer wall of the tube and the inner wall of the tube of the first tube body is such that the adhering substance pre-positions the shape of the heat exchange element on the mold, When the attached material falls on the pipe wall, the original mold occupies the cavity left after the drawing, that is, the shape of the heat exchange element.
The method according to claim 11 or 12, wherein the molten metal contains flake graphite powder, ceramic powder or diamond powder.
The method according to claim 11 or 12, wherein the adhering substance comprises at least one of gypsum, plastic, resin or clay.
The method according to claim 11 or 12, wherein the adhering substance is in the form of granules or powder, and the attached substance has a diameter ranging from 0.01 μm to 2 mm.
The method according to claim 11 or 12, wherein the heat exchanger further comprises N tubes, and the N tubes are sequentially sleeved on the second tube in an order of inner diameter from small to large. The N is a positive integer greater than or equal to 1; the method further includes:

Applying and/or spraying the adhering substance to the outer wall of the inner tube of the adjacent two tubes;

Spraying a metal liquid on the outer wall of the inner tube to infiltrate the metal liquid and filling the pores of the attached substance;

Before the solidification of the metal liquid, the outer tube of the two adjacent tubes is placed outside the inner tube, and the metal liquid of the outer wall of the inner tube is solidified and then connected to the outer wall of the inner tube and the outer tube. The inner wall of the outer tube;

After the metal liquid is deposited and cooled and formed, the adhering substance is washed away to form a heat exchange element having a regular structure or an irregular structure between the outer tube wall of the inner tube and the inner wall of the outer tube. .