CN108731511B

CN108731511B - Heat exchanger

Info

Publication number: CN108731511B
Application number: CN201710271633.XA
Authority: CN
Inventors: 李乃森; 侯晓峰; 唐华; 刘斌; 尚贵公; 王春艳; 秦国民; 张勇; 赵福臣; 李梅; 张晏崧; 商益腾
Original assignee: Petrochina Co Ltd
Current assignee: Daqing Petrochemical Machinery Factory Co ltd; Petrochina Co Ltd
Priority date: 2017-04-24
Filing date: 2017-04-24
Publication date: 2020-06-09
Anticipated expiration: 2037-04-24
Also published as: CN108731511A

Abstract

The present invention provides a heat exchanger, comprising: a housing having a heat exchange cavity; the tube plate is arranged in the heat exchange cavity; the heat exchange tube is connected with the tube plate; the first anode protection part is connected with the tube plate so that the first anode protection part is corroded by circulating water in the heat exchange cavity before the heat exchange tube. The invention solves the problems of poor circulating water corrosion resistance and short service life of the heat exchanger in the prior art.

Description

Heat exchanger

Technical Field

The invention relates to the technical field of heat exchange, in particular to a heat exchanger.

Background

The heat exchanger is a heat exchange device for transferring and converting heat energy (enthalpy), and the transferring and converting process of the heat energy (enthalpy) is a heat transfer process, and the modes of the heat transfer process generally include: thermal conduction, convection or radiation; thermal convection typically occurs when two media of different temperatures are in contact, for example, when two or more fluids of different temperatures are in thermal contact, or when a fluid is in contact with a solid surface, or when a fluid is in contact with solid particles, heat is transferred from the higher temperature medium to the lower temperature medium.

The water cooler belongs to one type of heat exchanger and is generally applied to the fields of chemical industry, oil refining, metallurgy, power transmission and other industries.

The water cooler usually works under a severe environment condition, when circulating water in the water cooler and a medium with higher temperature are subjected to heat energy transfer, scaling is easily formed on the pipe wall of the water side, in addition, when the circulating water is low in flow rate and poor in water quality, impurities such as sludge and the like are accumulated on the pipe wall of the water side, the existence of the scale layer and the sludge layer increases the heat resistance of heat energy transfer, and the heat exchange efficiency of the heat exchanger is reduced; moreover, because the circulating water has very strong corrosivity, corrode scale layer and water side pipe wall very easily in the short time, and cause the pipeline internal leakage, finally lead to the unable normal work of heat exchanger, consequently, current water cooler has the poor and short problem of life of corrosion behavior of resistant circulating water.

Disclosure of Invention

The invention mainly aims to provide a heat exchanger to solve the problems of poor circulating water corrosion resistance and short service life of the heat exchanger in the prior art.

In order to achieve the above object, the present invention provides a heat exchanger comprising: a housing having a heat exchange cavity; the tube plate is connected with the shell; the heat exchange tube is connected with the tube plate; the first anode protection part is connected with the tube plate so that the first anode protection part is corroded by circulating water in the heat exchange cavity before the heat exchange tube.

Further, the heat exchange tube is many, and many heat exchange tubes set up with interval, and each heat exchange tube extends along the length direction in heat transfer chamber, and first anode protection portion selectively sets up between two adjacent heat exchange tubes.

Further, the first anode protection part is multiple, and the multiple first anode protection parts are arranged on the tube plate at intervals.

Further, the first anode protection portion includes: the supporting core rod is connected with the tube plate and extends along the length direction of the heat exchange tube; and the anode reaction coating is arranged on the outer peripheral side of the support core rod.

Further, the heat exchanger also comprises a connecting structure, and the supporting core rod is detachably connected with the tube plate through the connecting structure.

Furthermore, the first anode protection part also comprises a support sleeve, the support sleeve is sleeved on the outer periphery of the support core rod and forms an overflowing space with the anode reaction coating, at least one overflowing hole communicated with the overflowing space is formed in the support sleeve, and the overflowing holes are arranged at intervals along the length direction and/or the circumferential direction of the support sleeve.

Further, the heat exchanger still includes floating head flange, hunch lid and second anode protection portion, and wherein, hunch lid sets up on floating head flange, and floating head flange is connected with tube sheet detachably, and second anode protection portion sets up on hunch lid and towards the protruding setting of one side of heat exchange tube.

Further, the second anode protection part is an anode reaction strip, the anode reaction strips are multiple, and the anode reaction strips are arranged at intervals.

Further, the heat exchanger still includes third anode protection portion, and third anode protection portion includes backup pad and anode reaction board, and the backup pad setting extends along the length direction in heat transfer chamber in the heat transfer intracavity, and the anode reaction board is two, and two anode reaction boards set up the both sides at the backup pad respectively.

Further, the heat exchanger also comprises a fourth anode protection part which is arranged on the inner wall of the shell.

Further, the fourth anode protection part is an anode reaction block, the number of the anode reaction blocks is multiple, and the anode reaction blocks are arranged around the length direction and/or the circumferential interval of the heat exchange cavity.

Furthermore, the heat exchanger also comprises an anti-corrosion protective layer coated on the inner wall surface of the shell; and/or the anticorrosive protective layer is coated on the inner wall of the heat exchange tube; and/or the anticorrosive protective layer is coated on the outer wall of the heat exchange tube.

Furthermore, the anti-corrosion protective layer is a silicon-aldehyde coating, and the thickness of the silicon-aldehyde coating is greater than or equal to 300 μm and less than or equal to 350 μm.

By applying the technical scheme of the invention, the heat exchanger comprises the first anode protection part connected with the tube plate, so that the first anode protection part can be corroded by circulating water in the heat exchange cavity before the heat exchange tube, the effect of protecting the heat exchange tube is achieved, the corrosion penetration time of the circulating liquid heat exchange tube is effectively prolonged, the service life of the heat exchanger is prolonged on the premise of ensuring the heat exchange efficiency of the heat exchanger, and the working reliability of the heat exchanger is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view showing an assembly relationship of a first anode protection portion with a tube sheet of a heat exchanger through a connection structure according to an alternative embodiment of the present invention;

FIG. 2 is a schematic view showing the assembly relationship of a first anode protection portion with a tube sheet of a heat exchanger through a connection structure according to another alternative embodiment of the present invention;

FIG. 3 shows a schematic front view of a second anodic protection sector, in assembled relationship with a floating head flange of a heat exchanger and with an arched cover of the heat exchanger, according to an alternative embodiment of the invention;

FIG. 4 shows a left side view of the second anode protection part, floating head flange and dome cover of FIG. 3;

FIG. 5 is a schematic view showing the assembly of a third anode guard with a portion of the housing of a heat exchanger according to an alternative embodiment of the invention;

FIG. 6 shows a cross-sectional view at A-A in FIG. 5;

FIG. 7 is a schematic view showing the assembled relationship of a fourth anode protection portion and a partial shell of a heat exchanger according to an alternative embodiment of the present invention;

FIG. 8 shows a cross-sectional view at B-B in FIG. 7;

fig. 9 is a partial cross-sectional view showing a heat exchange pipe coated with an anticorrosive protective layer according to an alternative embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a housing; 11. a heat exchange cavity; 20. a tube sheet; 30. a heat exchange pipe; 40. a first anode protection part; 41. supporting the core rod; 42. an anodic reaction coating; 43. a support sleeve; 431. an overflow space; 432. an overflowing hole; 50. a connecting structure; 60. a floating head flange; 70. an arch cover; 80. an anodic reaction strip; 90. a third anode protection section; 91. a support plate; 92. an anode reaction plate; 100. an anode reaction block; 110. and (4) an anti-corrosion protective layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a heat exchanger, aiming at solving the problems of poor circulating water corrosion resistance and short service life of the heat exchanger in the prior art.

As shown in fig. 1 to 9, the heat exchanger includes a shell 10, a tube sheet 20, and a first anode protection portion 40 of a heat exchange tube 30, the shell 10 has a heat exchange cavity 11, the tube sheet 20 is connected to the shell, the heat exchange tube 30 is connected to the tube sheet 20, and the first anode protection portion 40 is connected to the tube sheet 20 so that the first anode protection portion 40 is corroded by circulating water in the heat exchange cavity 11 before the heat exchange tube 30.

Because the heat exchanger includes the first anode protection portion 40 of being connected with tube sheet 20, first anode protection portion 40 can receive the circulating water corruption in the heat transfer chamber 11 earlier than heat exchange tube 30 like this to play the effect of protection heat exchange tube 30, prolonged circulating liquid heat exchange tube 30 effectively and corroded the time of penetrability, and then under the prerequisite of having guaranteed the heat exchange efficiency of heat exchanger, prolonged the life of heat exchanger, improved the reliability of heat exchanger work.

Specifically, the heat exchange tubes 30 are plural, the plural heat exchange tubes 30 are arranged at intervals, each heat exchange tube 30 extends along the length direction of the heat exchange cavity 11, and the first anode protection portion 40 is selectively arranged between two adjacent heat exchange tubes 30. Thus, the first anode protection part 40 can more effectively protect the heat exchange tubes 30 around the first anode protection part, prevent the heat exchange tubes 30 from being corroded and penetrated, prevent the media inside and outside the heat exchange tubes 30 from being mixed, and ensure the stable flow of the media inside the heat exchange tubes, thereby improving the heat exchange efficiency of the heat exchanger.

Alternatively, in order to sufficiently protect the plurality of heat exchange tubes 30 from corrosion, the first anode protecting portion 40 is plural, and the plurality of first anode protecting portions 40 are provided on the tube plate 20 at intervals.

As shown in fig. 1 and 2, the first anode protecting portion 40 includes a supporting core rod 41 and an anode reaction coating 42, the supporting core rod 41 being connected to the tube sheet 20 and extending in the length direction of the heat exchange tube 30, the anode reaction coating 42 being provided on the outer peripheral side of the supporting core rod 41. The supporting core rod 41 is arranged to support the anode reaction coating 42, and the supporting core rod 41 extends along the length direction of the heat exchange tube 30 to sufficiently protect the heat exchange tube 30 from corrosion.

As shown in fig. 1 and 2, in order to improve the stability of the connection between the first anode protecting portion 40 and the tube sheet 20, the heat exchanger further includes a connection structure 50, and the support core rod 41 is detachably connected to the tube sheet 20 through the connection structure 50.

As shown in fig. 1 and 2, the first anode protection part 40 further includes a support sleeve 43, the support sleeve 43 is sleeved on the outer periphery of the support core rod 41 and forms a flow passage space 431 with the anode reaction coating 42, at least one flow passage hole 432 communicated with the flow passage space 431 is opened on the support sleeve 43, and each flow passage hole 432 is arranged along the length direction and/or the circumferential direction of the support sleeve 43 at intervals. In this way, the supporting sleeve 43 not only supports the supporting core rod 41, so as to avoid bending deformation caused by overlong length of the supporting core rod 41, but also facilitates the replacement of the anode reaction coating 42 when the use is long, specifically, the operator only needs to pull the supporting core rod 41 along the length direction of the supporting sleeve 43, so as to easily complete the dismounting operation of the supporting core rod 41, thereby achieving the purpose of replacing the supporting core rod 41 provided with the unreacted anode reaction coating 42. In addition, the overflowing hole 432 can ensure that circulating water in the heat exchange cavity 11 stably enters the overflowing space 431 to contact and react with the anode reaction coating 42, so that the anticorrosion protection of the heat exchange pipe 30 is ensured; the flow holes 432 are spaced along the length direction and/or the circumference of the support sleeve 43 to ensure that the circulating water in the heat exchange chamber 11 can quickly and uniformly fill the flow space 431 in a short time to fully contact the anode reaction coating 42.

It should be noted that, in order to reduce the overall processing and manufacturing cost of the heat exchanger, the support sleeve 43 may be formed by modifying a heat exchange tube at a suitable position, and the support core rod 41 provided with the anode reaction coating 42 may be installed in the heat exchange tube only by completing the punching operation of the selected heat exchange tube, so that the phenomenon that the heat exchange tube is corroded and penetrated can also be avoided.

Fig. 1 is a schematic view showing an assembled relationship of a first anode protection portion and a tube plate of a heat exchanger through a connection structure according to a first embodiment of the present invention; in this embodiment, the supporting sleeve 43 is formed by modifying a straight heat exchange tube, two ends of the supporting sleeve 43 are respectively connected to the two tube plates 20 arranged oppositely, and the supporting core rod 41 is installed between the two tube plates 20 through two connecting structures 50.

Fig. 2 is a schematic view showing an assembled relationship of a first anode protection portion of a second embodiment of the present invention with a tube plate of a heat exchanger through a connection structure; the difference between the second embodiment and the first embodiment is that the support sleeve 43 is formed by modifying a U-shaped heat exchange tube, two ends of the U-shaped support sleeve 43 are respectively connected to the same tube plate 20, one end of the support core rod 41 is installed on the tube plate 20 through the connection structure 50, and the other end of the support core rod 41 is a free end extending in the U-shaped support sleeve 43.

It should be noted that, when the supporting sleeve 43 can be designed according to different heat exchange tube specifications, the thickness of the anode reaction coating 42 is different, for example, the supporting sleeve 43 is selected

The thickness of the anode reaction coating 42 is within the range of 5.5-7mm, or the supporting sleeve 43 is selected

The thickness of the anode reaction coating 42 is in the range of 6-10 mm; or the supporting sleeve 43 is selected

The thickness of the anode reaction coating 42 is in the range of 8-14 mm.

As shown in fig. 3 and 4, the heat exchanger further includes a floating head flange 60, an arch cover 70, and a second anode protecting portion, wherein the arch cover 70 is provided on the floating head flange 60, the floating head flange 60 is detachably coupled with the tube sheet 20, and the second anode protecting portion is provided on the arch cover 70 and is convexly provided toward one side of the heat exchange tube 30. Therefore, the second anode protection part can effectively perform anticorrosion protection on the floating flange 60 and the arch cover 70, reliably prolongs the service cycle of the floating flange 60 and the arch cover 70, and ensures that the heat exchanger is always in a stable working state.

Alternatively, in order to sufficiently protect the floating flange 60, the dome cover 70, and the structural components connected thereto from corrosion, the second anode protecting portion is an anode reaction strip 80, the anode reaction strips 80 are plural, and the plural anode reaction strips 80 are provided at intervals.

As shown in fig. 5 and 6, the heat exchanger further includes a third anode protection part 90, the third anode protection part 90 includes a support plate 91 and two anode reaction plates 92, the support plate 91 is disposed in the heat exchange chamber 11 and extends along the length direction of the heat exchange chamber 11, and the two anode reaction plates 92 are disposed on two sides of the support plate 91 respectively. In this way, the third anode protection part 90 can also react with the circulating water before the structural components or the shell 10 in the heat exchange cavity 11, so as to play a role in protecting the structural components or the shell 10 in the heat exchange cavity 11 from corrosion, further prolong the service life of the heat exchanger and prolong the service life of the heat exchanger.

As shown in fig. 7 and 8, the heat exchanger further includes a fourth anode protection portion provided on an inner wall of the case 10. In this way, the fourth anode protection part can also react with the circulating water before the structural components or the shell 10 in the heat exchange cavity 11, so that the function of protecting the structural components or the shell 10 in the heat exchange cavity 11 from the anode corrosion is achieved, the service cycle of the heat exchanger is further prolonged, and the service life of the heat exchanger is prolonged.

Optionally, in order to sufficiently protect the casing 10 from corrosion, the fourth anode protection portion is an anode reaction block 100, the anode reaction block 100 is multiple, and the multiple anode reaction blocks 100 are arranged at intervals around the length direction and/or the circumference of the heat exchange cavity 11.

As shown in fig. 5 to 9, the heat exchanger further includes an anticorrosion protective layer 110, and the anticorrosion protective layer 110 is coated on an inner wall surface of the casing 10; and/or the anticorrosive protection layer 110 is coated on the inner wall of the heat exchange pipe 30; and/or the corrosion prevention protective layer 110 is coated on the outer wall of the heat exchange pipe 30.

Optionally, the anticorrosion protection layer 110 is a silicon-aldehyde coating, and the thickness of the silicon-aldehyde coating is greater than or equal to 300 μm and less than or equal to 350 μm.

It should be noted that the coating composition of the silicone-aldehyde coating is different according to the different components of the circulating water. The silicon bond structure can be formed at the protective bottom layer of the silicon aldehyde coating, so that the silicon aldehyde coating has excellent adhesive force and good toughness, and the silicon aldehyde coating has the characteristic of being difficult to crack and crack when being collided during overhauling or hoisting the heat exchanger; in addition, the silicon aldehyde coating has good wear resistance, and can prevent the scraping and damage of the silicon aldehyde coating caused in the process of manufacturing machines such as pipe penetration and the like; the chemical stability of the silicon-aldehyde coating is high, and the impact resistance, the permeability resistance and the wear resistance are good; the heat exchanger can be used in a medium environment of-40-350 ℃ for a long time, the silicon-aldehyde coating can be subjected to continuous sweeping of 10 kilograms of high-temperature steam during startup and shutdown on the premise that a heat exchanger does not cut off a system, the quality of the silicon-aldehyde coating is not influenced, the problem that the anticorrosion coating of the heat exchanger is not resistant to steam sweeping is solved, and the silicon-aldehyde coating also has excellent heat conduction performance and does not influence the heat exchange effect of the heat exchanger; and the surface energy of the silicon-aldehyde coating is low, the surface of the silicon-aldehyde coating is not easy to scale, and impurities are not easy to accumulate on the surface of the silicon-aldehyde coating, so that the comprehensive performance index of the silicon-aldehyde coating is excellent, and the use stability of the heat exchanger coated with the silicon-aldehyde coating is steadily improved.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: after the heat exchanger is put into operation and used, the service life of the heat exchanger is prolonged by at least 6 years and is greatly higher than that of a common water cooler, and the problem of temporary shutdown and rush repair or equipment maintenance caused by internal leakage of a water side pipeline can be avoided in at least two operation periods of the heat exchanger. The heat exchanger provided by the invention has lower maintenance cost while running safely, thereby improving the continuous production running capacity of the heat exchanger and realizing the maximization of production benefit.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat exchanger, comprising:

a housing (10), said housing (10) having a heat exchange cavity (11);

a tube sheet (20), the tube sheet (20) being connected to the shell (10);

the heat exchange tube (30), the said heat exchange tube (30) is connected with said tube sheet (20);

the first anode protection part (40), the first anode protection part (40) is connected with the tube plate (20) so that the first anode protection part (40) is corroded by circulating water in the heat exchange cavity (11) before the heat exchange tube (30); the first anode protection portion (40) includes: the supporting core bar (41), the supporting core bar (41) is connected with the tube plate (20) and extends along the length direction of the heat exchange tube (30); an anode reaction coating (42), the anode reaction coating (42) being provided on an outer peripheral side of the supporting core bar (41).

2. The heat exchanger as recited in claim 1, wherein the heat exchange tube (30) is plural, a plurality of the heat exchange tubes (30) are arranged at intervals, and each of the heat exchange tubes (30) extends along a length direction of the heat exchange chamber (11), and the first anode protection portion (40) is selectively arranged between adjacent two of the heat exchange tubes (30).

3. The heat exchanger according to claim 1, wherein the first anode protecting portion (40) is plural, and the plural first anode protecting portions (40) are provided on the tube sheet (20) at intervals.

4. The heat exchanger according to claim 1, further comprising a connection structure (50), wherein the supporting core rod (41) is detachably connected with the tube sheet (20) through the connection structure (50).

5. The heat exchanger according to claim 1, wherein the first anode protection part (40) further comprises a support sleeve (43), the support sleeve (43) is sleeved on the outer peripheral side of the support core rod (41) and forms a flow passage space (431) with the anode reaction coating (42), at least one flow passing hole (432) communicated with the flow passage space (431) is formed in the support sleeve (43), and the flow passing holes (432) are arranged at intervals along the length direction and/or the circumferential direction of the support sleeve (43).

6. The heat exchanger according to claim 1, further comprising a floating head flange (60), an arch cover (70), and a second anode protection portion, wherein the arch cover (70) is provided on the floating head flange (60), the floating head flange (60) is detachably connected to the tube sheet (20), and the second anode protection portion is provided on the arch cover (70) and is convexly provided toward one side of the heat exchange tube (30).

7. The heat exchanger according to claim 6, wherein the second anode protection portion is an anode reaction bar (80), the anode reaction bar (80) is plural, and the plural anode reaction bars (80) are arranged at intervals.

8. The heat exchanger according to claim 1, further comprising a third anode protection portion (90), wherein the third anode protection portion (90) comprises a support plate (91) and two anode reaction plates (92), the support plate (91) is disposed in the heat exchange chamber (11) and extends along the length direction of the heat exchange chamber (11), and the two anode reaction plates (92) are disposed on two sides of the support plate (91).

9. The heat exchanger according to claim 1, characterized in that it further comprises a fourth anodic protection provided on the inner wall of the casing (10).

10. The heat exchanger according to claim 9, wherein the fourth anode protection portion is an anode reaction block (100), the anode reaction block (100) is a plurality of anode reaction blocks, and the plurality of anode reaction blocks (100) are arranged around the length direction and/or the circumferential direction of the heat exchange cavity (11) at intervals.

11. The heat exchanger according to claim 1, characterized in that the heat exchanger further comprises a corrosion protection layer (110),

the anticorrosion protective layer (110) is coated on the inner wall surface of the shell (10); and/or

The anti-corrosion protective layer (110) is coated on the inner wall of the heat exchange pipe (30); and/or

The anti-corrosion protective layer (110) is coated on the outer wall of the heat exchange tube (30).

12. The heat exchanger according to claim 11, characterized in that the corrosion protection layer (110) is a silicon-aldehyde coating having a thickness of 300 μ ι η or more and 350 μ ι η or less.