A method for arranging a heat exchanger with cathodic protection and a sacrificial anode

Abstract

The application discloses a heat exchanger with cathode protection and a method for arranging a sacrificial anode, and belongs to the technical field of heat exchangers. The heat exchanger is a floating head type shell-and-tube heat exchanger, characterized in that a heat exchanger core which can be drawn out of a heat exchanger shell is packaged in the heat exchanger shell. A heat exchange tube group is composed of a preset number of parallel heat exchange tubes, and a sacrificial anode connecting assembly is arranged between the parallel heat exchange tubes. The application has the beneficial effects that the baffle rod enhances fluid flow, reduces dead zones, reduces shell-side fluid resistance, and improves heat exchange efficiency; the baffle rod can better seal and buffer through a self-locking buckle design; the U-shaped pipe guard edge structure increases the contact area between the sacrificial anode and the outer diameter of the tube bundle; balanced potential and relatively constant electromotive force are formed in the same baffle ring plane, the consumption of the sacrificial anode is reduced, and the problem of uneven potential of the sacrificial anode arranged on the baffle plate can be perfectly solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of heat exchangers, and more particularly to a heat exchanger with cathodic protection and a method for arranging a sacrificial anode. BACKGROUND

[0002] Taking the chlorobenzene production process as an example, leakage of heat exchange equipment often occurs, and the method of sacrificial anode is a relatively economical protection form for heat exchange equipment in a corrosive working condition.

[0003] At present, the heat exchanger with cathodic protection is mostly realized by setting a sacrificial anode. The existing design arranges the sacrificial anode on a traditional baffle plate, realizes the current loop through a conductive bypass, and realizes cathodic protection. The baffle plate is subjected to strong impact and scouring when the fluid in the shell passes through, and the fixed anode material may be unstable or fall off, thereby losing the purpose of cathodic protection. Moreover, the baffle plate type heat exchanger also has the disadvantages of large fluid resistance in the shell, dead zone in the baffle plate area, low utilization rate of the baffle plate, and low heat exchange efficiency.

[0004] Similarly, the existing design arranges the sacrificial anode on an ordinary tube-shell heat exchanger, which causes the sacrificial anode material to gradually consume and eventually lose protection, and cannot be repaired. If repair is needed, the heat exchanger cylinder or the equipment needs to be cut open, which cannot achieve the purpose of convenient replacement.

[0005] The existing design also has a floating head type heat exchange equipment, which achieves the purpose of replaceable anode material, but arranges the anode material on the baffle plate, the head, or the cylinder. The protection of the heat exchange tube is uneven, the protection current is weakened due to the increase in resistivity, thereby failing to achieve the purpose of cathodic protection. At the same time, the high resistivity also causes the sacrificial anode material to consume too quickly. SUMMARY

[0006] To solve the above problems and overcome the shortcomings of the prior art, the present application provides a heat exchanger with cathodic protection and a method for arranging a sacrificial anode, which can effectively solve the problem of arranging the sacrificial anode on a traditional baffle plate, realizing the current loop through a conductive bypass, and realizing cathodic protection. The baffle plate is subjected to strong impact and scouring when the fluid in the shell passes through, and the fixed anode material may be unstable or fall off.

[0007] The specific technical solution for solving the above technical problems is as follows: a heat exchanger with cathodic protection, the heat exchanger is a floating head type tube-shell heat exchanger, the floating head type tube-shell heat exchanger comprises a heat exchanger shell, first and second shell heads are installed at both ends of the heat exchanger shell, characterized in that the heat exchanger shell is packaged with a heat exchanger core that can be pulled out of the heat exchanger shell.

[0008] The heat exchanger core comprises two floating head tubesheets matched with the first shell head and the second shell head, a heat exchange tube group connected between the two floating head tubesheets, and a plurality of baffle rod fixing rings arranged on the outer side of the heat exchange tube group along the longitudinal depth of the heat exchange tube group, wherein the side end face of the baffle rod fixing ring is provided with an extension edge surrounding the outer side of the heat exchange tube group.

[0009] The heat exchange tube group is composed of a plurality of parallel heat exchange tubes, and a sacrificial anode connecting assembly is arranged between the parallel heat exchange tubes.

[0010] The sacrificial anode connecting assembly comprises a baffle rod penetrating between the extension edges, and the baffle rod on the outer side of the extension edge is fixed with the baffle rod fixing ring through a pin shaft.

[0011] The baffle rod is hollow, and a sacrificial anode rod is arranged in the baffle rod, and a plurality of holes are uniformly arranged on the side wall of the baffle rod.

[0012] The sacrificial anode rod is different from the commonly used zinc anode, and the standard aluminum anode is selected.

[0013] Further, the heat exchange tubes are arranged in a matrix form on the floating head tubesheet, and a spacing is arranged between the parallel heat exchange tubes.

[0014] Further, the side wall of the baffle rod is symmetrically and vertically connected with a fixed support, the end of the fixed support is connected with a U-shaped pipe extension edge through a universal ball, and the U-shaped pipe extension edge is separably surrounded on the side wall of the heat exchange tube through the rotation of the baffle rod.

[0015] Further, the side wall of the baffle rod is symmetrically and vertically connected with a fixed support, the end of the fixed support is connected with a U-shaped pipe extension edge through a universal ball, and the U-shaped pipe extension edge is separably surrounded on the side wall of the heat exchange tube through the rotation of the baffle rod.

[0016] Further, the baffle rod and the sacrificial anode rod are provided with pin holes matched with the pin shaft.

[0017] Further, the sacrificial anode arrangement method of the heat exchanger adopts the heat exchanger with cathodic protection, and the specific steps include:

[0018] 1. The sacrificial anode connecting assembly is arranged between the parallel heat exchange tubes, the baffle rod is arranged in the extension edge, and the sacrificial anode rod is arranged in the baffle rod;

[0019] 2. The baffle rod and the sacrificial anode rod are provided with pin holes matched with the pin shaft, the rotation of the pin shaft drives the rotation of the baffle rod, and the baffle rod and the sacrificial anode rod are fixed on the baffle rod ring through the pin shaft to realize electrical connection;

[0020] 3. The side wall of the baffle rod is connected with a fixed support perpendicularly and symmetrically, the end of the fixed support is connected with the U-shaped protection pipe through the universal ball, the U-shaped protection pipe rotates with the fixed support shaft through the rotation of the baffle rod, and the U-shaped protection pipe can be separated and surrounded on the side wall of the heat exchange pipe.

[0021] Further, the replacement method of the sacrificial anode rod of the heat exchanger is as follows:

[0022] 1. The first shell head or the second shell head at the two ends of the heat exchanger shell is disassembled, and the heat exchanger core is pulled out from the heat exchanger shell to the outside of the heat exchanger shell.

[0023] 2. The pin shaft is pulled out, the sacrificial anode rod is pushed out from the inside of the baffle rod by using the disassembly rod, a new sacrificial anode rod is inserted into the inside of the baffle rod, the rotation of the baffle rod is driven through the rotation of the pin shaft, and the baffle rod and the sacrificial anode rod are fixed on the baffle rod ring through the pin shaft to realize electrical connection.

[0024] 3. The side wall of the baffle rod is connected with a fixed support perpendicularly and symmetrically, the end of the fixed support is connected with the U-shaped protection pipe through the universal ball, the U-shaped protection pipe rotates with the fixed support shaft through the rotation of the baffle rod, and the U-shaped protection pipe can be separated and surrounded on the side wall of the heat exchange pipe.

[0025] Further, the replacement method of the baffle rod of the heat exchanger is as follows:

[0026] 1. The pin shaft is pulled out, and the rotation of the baffle rod is driven through the rotation of the pin shaft, and the U-shaped protection pipe extends along the fixed support shaft and is separated from the side wall of the heat exchange pipe.

[0027] 2. The baffle rod fixing ring designed in two halves is disassembled and taken out from both sides, the baffle rod is pulled out from the hole in the baffle rod fixing ring, the baffle rod is pulled out from the gap of the heat exchange tube, the fixed support of the side wall of the baffle rod is disassembled, the fixed support and the U-shaped protection pipe are connected to the new baffle rod, and then the baffle rod is inserted into the gap of the heat exchange tube. The baffle rod is sleeved into the baffle rod from both ends of the baffle rod, and the two halves of the baffle rod fixing ring are connected in the middle.

[0028] Further, the detachable connection mode of the fixed support, the side wall of the baffle rod and the middle of the baffle rod fixing ring designed in two halves is screw connection or buckle connection.

[0029] The beneficial effects of the present application are as follows:

[0030] The baffle rod enhances the fluid flow, reduces the dead zone, reduces the fluid resistance in the shell, and improves the heat exchange efficiency by 15% to 50%;

[0031] The baffle rod is fixed with the rod fixing ring quickly through the self-locking buckle design, the inner diameter of the rod fixing ring is consistent with the outer diameter of the tube bundle, the outer diameter is consistent with the inner diameter of the cylinder, the outer side is provided with a U-shaped pipe extension edge design, which can better seal and buffer effect, avoids the stress concentration of the fixed support and the tube bundle caused by impact, and causes the generation of liquid leakage;

[0032] The use of the baffle rod, the baffle ring and the special arrangement mode of the present application can solve the problems of the traditional baffle plate. Meanwhile, the U-shaped pipe extension edge structure increases the contact area of the sacrificial anode and the outer diameter of the tube bundle, and balanced potential and relatively constant electromotive force are formed in the same baffle ring plane, so that the consumption of the sacrificial anode is reduced, and the problem of uneven potential of the sacrificial anode arranged by the baffle plate can be perfectly solved. BRIEF DESCRIPTION OF DRAWINGS

[0033] ATTACHED Figure 1 is a structural schematic diagram of the present application;

[0034] ATTACHED Figure 2 is a structural schematic diagram of the heat exchanger core of the present application;

[0035] ATTACHED Figure 3 is a structural schematic diagram of the sacrificial anode connecting assembly of the present application;

[0036] ATTACHED Figure 4 is a structural schematic diagram of the local magnification of the sacrificial anode connecting assembly of the present application;

[0037] ATTACHED Figure 5 is a structural schematic diagram of the rod fixing ring of the present application

[0038] 1. First shell head; 2. Heat exchanger shell; 3. Second shell head; 4. Floating head tube plate; 5. Rod fixing ring; 6. Heat exchanger tube group; 7. Heat exchanger tube; 8. Extension edge; 9. Pin shaft; 10. Baffle rod; 11. Sacrificial anode rod; 12. Fixed support; 13. U-shaped pipe extension edge; 14. Universal ball. DETAILED DESCRIPTION

[0039] In the description of the present application, specific details are only for the purpose of fully understanding the embodiments of the present application, but as a person skilled in the art should know that the implementation of the present application is not limited to these details. In addition, well-known structures and functions are not described or shown in detail to avoid obscuring the key points of the embodiments of the present application. For those skilled in the art, the specific meanings of the above terms in the present application can be understood in specific circumstances.

[0040] Specific embodiments of the present application:

[0041] For better understanding of the present application, it is worth emphasizing that the effects of the embodiments have no substantial difference with various embodiments within the scope of the present application, including respective reagents and content ratio of reagents, which can all achieve the effects described in the present application and solve the above problems, and other combinations are not listed here.

[0042] The heat exchanger with cathodic protection is a floating head type shell-and-tube heat exchanger, which comprises a heat exchanger shell 2, and a first shell head 1 and a second shell head 3 are respectively arranged at two ends of the heat exchanger shell 2, characterized in that a heat exchanger core which can be pulled out of the heat exchanger shell 2 is packaged in the heat exchanger shell 2.

[0043] The heat exchanger core comprises two floating head tube plates 4 matched with the first shell head 1 and the second shell head 3, and a heat exchange tube group 6 is connected between the two floating head tube plates 4, and a plurality of baffle rod fixing rings 5 are arranged on the outer side of the heat exchange tube group 6 in the longitudinal direction of the heat exchange tube group 6, and the side end face of the baffle rod fixing ring 5 is provided with an extension edge 8, and the extension edge 8 is arranged on the outer side of the heat exchange tube group 6,

[0044] The heat exchange tube group 6 is composed of a plurality of parallel arranged heat exchange tubes 7, and a sacrificial anode connecting assembly is arranged between the parallel arranged heat exchange tubes 7.

[0045] The sacrificial anode connecting assembly comprises a baffle rod 10 penetrating between the extension edges 8, and the baffle rod 10 located on the outer side of the extension edge 8 is fixed with the baffle rod fixing ring 5 through a pin shaft 9.

[0046] The baffle rod 10 is hollow, and a sacrificial anode rod 11 is arranged inside the baffle rod 10, and a plurality of openings are uniformly arranged on the side wall of the baffle rod 10.

[0047] The side wall of the baffle rod 10 is symmetrically and vertically connected with a fixed support 12, and the end of the fixed support 12 is connected with a U-shaped pipe extension edge 13 through a universal ball 14, and the U-shaped pipe extension edge 13 is separably arranged on the side wall of the heat exchange tube 7 through the rotation of the baffle rod 10.

[0048] Further, the heat exchange tubes 7 are arranged in a matrix form on the floating head tube plate 4, and a spacing is arranged between the parallel arranged heat exchange tubes 7.

[0049] Further, the side wall of the baffle rod 10 is symmetrically and vertically connected with a fixed support 12, and the end of the fixed support 12 is connected with a U-shaped pipe extension edge 13 through a universal ball 14, and the U-shaped pipe extension edge 13 is separably arranged on the side wall of the heat exchange tube 7 through the rotation of the baffle rod 10.

[0050] Further, the baffle rod 10 and the sacrificial anode rod 11 are provided with pin holes matched with the pin shaft 9.

[0051] Further, the method for arranging the sacrificial anode of the heat exchanger adopts the heat exchanger with cathodic protection, and specifically comprises the following steps:

[0052] Step 1: the sacrificial anode connecting assembly is arranged between the parallel heat exchange pipes 7, the blocking rod 10 is arranged in the extension edge 8, and the sacrificial anode rod 11 is arranged in the blocking rod 10,

[0053] Step 2: the blocking rod 10 and the sacrificial anode rod 11 are provided with pin holes matched with the pin shaft 9, the rotation of the pin shaft 9 drives the rotation of the blocking rod 10, and the pin shaft 9 is used to fix the blocking rod 10 and the sacrificial anode rod 11 on the blocking rod fixing ring 5 to realize electrical connection;

[0054] Step 3: the side wall of the blocking rod 10 is symmetrically and perpendicularly connected with the fixing support 12, the end of the fixing support 12 is connected with the U-shaped protective pipe extension edge 13 through the universal ball 14, the U-shaped protective pipe extension edge 13 rotates with the rotation shaft of the fixing support 12 through the rotation of the blocking rod 10, and can be separated and surrounded on the side wall of the heat exchange pipe 7.

[0055] Further, the method for replacing the sacrificial anode rod 11 of the heat exchanger,

[0056] Step 4: the first shell head 1 or the second shell head 3 at the two ends of the heat exchanger shell 2 is disassembled, and the heat exchanger core is pulled out from the heat exchanger shell 2 to the outside of the heat exchanger shell 2;

[0057] Step 5: the pin shaft 9 is pulled out, the sacrificial anode rod 11 is pushed out from the inside of the blocking rod 10 by using the disassembling rod, a new sacrificial anode rod 11 is inserted into the inside of the blocking rod 10, the rotation of the pin shaft 9 drives the rotation of the blocking rod 10, and the pin shaft 9 is used to fix the blocking rod 10 and the sacrificial anode rod 11 on the blocking rod fixing ring 5 to realize electrical connection;

[0058] Step 6: the side wall of the blocking rod 10 is symmetrically and perpendicularly connected with the fixing support 12, the end of the fixing support 12 is connected with the U-shaped protective pipe extension edge 13 through the universal ball 14, the U-shaped protective pipe extension edge 13 rotates with the rotation shaft of the fixing support 12 through the rotation of the blocking rod 10, and can be surrounded on the side wall of the heat exchange pipe 7.

[0059] Further, the method for replacing the blocking rod of the heat exchanger:

[0060] Step 7: the pin shaft 9 is pulled out, the U-shaped protective pipe extension edge 13 rotates with the rotation shaft of the fixing support 12 through the rotation of the pin shaft 9, and is separated from the side wall of the heat exchange pipe 7;

[0061] Step 8: the fixing bolt in the middle of the blocking rod fixing ring 5 and the extension edge 8 is disassembled and taken out in two halves, and then the two ends of the blocking rod 10 and the sacrificial anode rod 11 are pulled out from the hole of the blocking rod fixing ring;

[0062] Step 9: the baffle 10 is pulled out from the gap of the heat exchange tube, and the fixed support 12 of the side wall of the baffle 10 is disassembled; the fixed support 12 is fixed to the new baffle 10 and inserted into the gap of the heat exchange tube, and the U-shaped protective tube extension edge 13 is reattached to the heat exchange tube by rotating the baffle 10 with the fixed support 12.

[0063] Step 10: the baffle fixing ring 5 is sleeved on both ends of the baffle 10 from both sides, and the two halves of the baffle fixing ring 5 are bolted together to form a ring and are sleeved on the outside of the tube bundle.

[0064] Further, the fixed support 12 is detachably connected to the side wall of the baffle 10 and the two halves of the baffle fixing ring 5 by screw connection or buckle connection.

[0065] As described above, the present application designs a carbon steel floating head type heat exchanger with a heat exchange area of 800 m2, an outer diameter r1 of the heat exchange tube bundle of 3000 mm, a floating head heat exchanger cylinder diameter of r2=3500 mm, and a heat exchanger length L=6000 mm. A set of baffle and baffle fixing ring is provided every 1000 mm. The inner diameter of the baffle fixing ring 5 is r1, the outer diameter is r2, the thickness is δ=6 mm, the width of the extension edge 8 is 50 mm, and the thickness is δ=6 mm,

[0066] A circular hole with a diameter of φ=27 mm is formed on the extension edge 8 according to the position of the heat exchange tube gap, and the two ends 11 of the baffle 10 with a diameter of φ=25 mm and the aluminum sacrificial anode rod with a diameter of φ=22 mm pass through the circular hole. The baffle 10 and the two ends 11 of the aluminum anode rod are provided with pin holes with a diameter of φ=6 mm, which are aligned with the pin holes on the baffle fixing ring 5, and the same baffle material is used to pass through the pin connection to form an electrical connection.

[0067] In this example, the infinite distance is set as the potential zero point, and potential measurement detection terminals are arranged at the corresponding positions of the two baffle fixing rings 5. In this example, a UJ33a type direct current potential difference meter is used to measure the preset terminals.

[0068] In this example, the working condition of the heat exchanger is that the tube layer is organic material, the inlet and outlet temperatures are 80℃ and 60℃, the shell layer is frozen brine, the inlet water temperature is -15℃, and the outlet temperature is 5℃. The corrosion in the similar seawater environment and the more serious temperature difference corrosion.

[0069] ΔE=Ep-Ea …………………………… ①

[0070] I=i×S………… …………………… ②R=(ρ / 2πL)·(ln(4L / r)-1)……………③

[0071] If=Ep-Ea / R…………………… ④

[0072] N=If / I… …… …… …… …… ⑤

[0073] In this example, the measured protection potential was Ev = -0.85V relative to a copper / saturated copper sulfate reference electrode (the same applies below). The minimum current i = 50mA / ㎡. The driving potential ΔE of the aluminum sacrificial anode is 0.25V according to formula ①. By analogy with seawater, its resistance is ρ = 30Ω. Formula ② yields the required protection current I = 40A. Combining the above aluminum anode design data, formulas ③ and ④ yield the power generation per aluminum anode as If = 1.36A. Formula ⑤ further indicates that 1kg of protection anodes is required for every 10㎡ of heat exchange area.

[0074] In order to more intuitively demonstrate the advantages of the equipment and process of the present invention, the installation method of the heat exchanger with cathodic protection and sacrificial anode of the present invention is compared with the equivalent replacement method of the same process.

[0075] Comparative Example 1:

[0076] The sacrificial anode is mounted on a conventional baffle, and a conductive bypass is used to create a current loop for cathodic protection. However, due to insufficient contact between the conductive bypass and the heat exchange tube, the protection potential measured by a DC potentiometer exhibits uneven fluctuations due to the asymmetric nature of the baffle, i.e., -0.80v, -0.43v, -0.80v, -0.47v, -0.78v, -0.41v, etc.;

[0077] Comparative Example 2:

[0078] It is a floating head heat exchanger, the difference is that the anode material is installed on the baffle or head or cylinder;

[0079] Comparative Example 3:

[0080] Same as the embodiment, except that the sacrificial anode is inserted into the barrier rod, and the barrier rod is directly connected to the side wall of the heat exchange tube through a fixed support.

[0081] Table 1: Comparison of different sacrificial anode installation methods

[0082]

[0083] From the data analysis in Table 1, we can see that:

[0084] 1. Example 1 compared with Comparative Example 1:

[0085] Such structure realizes cathode protection by realizing current loop through conductive bypass, the baffle is impacted and scoured when the shell fluid flows, the fixed anode material is unstable or falls off, thereby losing the purpose of cathode protection, and the baffle type heat exchanger also has the defects of large shell side fluid resistance, dead zone in the baffle area, low baffle utilization rate and low heat exchange efficiency;

[0086] In particular: in the electric potential / heat exchange pipe corrosion degree, the performance is worse than that of the present application, the electric potential is uneven, and the interval corrosion serious part appears;

[0087] 2, compared with comparative example 2:

[0088] In comparative example 2, the sacrificial anode is installed on the ordinary tube shell heat exchanger, specifically, the sacrificial anode is installed on the ordinary tube shell heat exchanger, which leads to that with the gradual consumption of the anode material, the protection is finally lost and cannot be repaired, if repair is needed, the heat exchanger cylinder or the equipment is damaged, and the purpose of convenient replacement cannot be achieved.

[0089] 3, compared with comparative example 3:

[0090] The sacrificial anode is arranged in the stop rod, and the stop rod is directly connected with the side wall of the heat exchange pipe through the fixed support, which can be quickly fixed with the stop rod fixed ring through the self-locking buckle design of the present application, the inner diameter of the stop rod fixed ring is consistent with the outer diameter of the pipe bundle, the outer diameter is consistent with the inner diameter of the cylinder, and the outer side is provided with a U-shaped guard pipe extension edge design compared with the present application, which can better seal and buffer effect, avoid the problem that the fixed support is cut off and the pipe bundle is damaged due to stress concentration in comparative example 3, and the problem of liquid leakage is avoided.

[0091] At the same time, the U-shaped guard pipe extension edge structure increases the contact area of the sacrificial anode and the outer diameter of the pipe bundle, and forms balanced potential and relatively constant electric potential in the same baffle ring plane, reduces the consumption of the sacrificial anode, and can perfectly solve the problem of uneven electric potential of the baffle arranged sacrificial anode.

[0092] In summary: the baffle stop rod enhances fluid flow, reduces dead zone, reduces shell side fluid resistance, and improves heat exchange efficiency by 15%-50%;

[0093] At the same time, the rotation of the pin shaft drives the rotation of the stop rod, and the stop rod and the sacrificial anode rod are fixed in the stop rod fixed ring to realize electrical connection, realize the change of the form of the U-shaped guard pipe extension edge, realize the installation and separation type surrounding on the side wall of the heat exchange pipe between the narrow pipe bundle, and increase the contact area of the sacrificial anode and the outer diameter of the pipe bundle;

[0094] The baffle lever is quickly fixed with the lever fixing ring through the self-locking buckle design, the inner diameter of the lever fixing ring is consistent with the outer diameter of the tube bundle, the outer diameter is consistent with the inner diameter of the cylinder, the outer side is provided with a U-shaped guard pipe extension edge design, which can better seal and buffer effect, avoids stress concentration of the fixed support column and the tube bundle caused by impact, and causes liquid leakage;

[0095] Using the baffle lever and the baffle ring and the special arrangement mode of the special application, the problems of the traditional baffle plate can be solved, meanwhile, the U-shaped guard pipe extension edge structure increases the contact area of the sacrificial anode and the outer diameter of the tube bundle, balanced potential is formed in the same baffle ring plane, and relatively constant electromotive force is formed, the consumption of the sacrificial anode is reduced, and the problem of uneven potential of the sacrificial anode arranged by the baffle plate can be perfectly solved.

Claims

1. A heat exchanger with cathodic protection, the heat exchanger being a floating head shell and tube heat exchanger, the floating head shell and tube heat exchanger comprising a heat exchanger shell (2), a first shell head (1) and a second shell head (3) being mounted at both ends of the heat exchanger shell (2), characterized in that The heat exchanger core is extracted from the heat exchanger shell (2); The heat exchanger core comprises two floating head tubesheets (4) matched with the first shell head (1) and the second shell head (3), and a heat exchange tube group (6) is connected between the two floating head tubesheets (4); a plurality of baffle rod fixing rings (5) are arranged on the outer side of the heat exchange tube group (6) in the longitudinal direction of the heat exchange tube group (6), and the side end face of the baffle rod fixing ring (5) is provided with an extension edge (8) surrounding the outer side of the heat exchange tube group (6), The heat exchange tube group (6) is composed of a plurality of parallel heat exchange tubes (7), and a sacrificial anode connecting assembly is arranged between the parallel heat exchange tubes (7), The sacrificial anode connecting assembly comprises a baffle rod (10) penetrating between the extension edges (8), and the baffle rod (10) outside the extension edges (8) is fixed with the baffle rod fixing ring (5) through a pin shaft (9), The baffle rod (10) is hollow, and a sacrificial anode rod (11) penetrates in the baffle rod (10), and a plurality of openings are uniformly arranged on the side wall of the baffle rod (10); The side wall of the baffle rod (10) is symmetrically and perpendicularly connected with a fixed support (12), and the end of the fixed support (12) is connected with a U-shaped pipe extension edge (13) through a universal ball (14), and the U-shaped pipe extension edge (13) is detachably surrounded on the side wall of the heat exchange tube (7) through the rotation of the baffle rod (10).

2. The heat exchanger with cathodic protection according to claim 1, characterized in that The heat exchange tubes (7) are arranged in a matrix form on the floating head tubesheet (4), and a spacing is arranged between the parallel heat exchange tubes (7).

3. The heat exchanger with cathodic protection according to claim 1, characterized in that The side wall of the baffle rod (10) is symmetrically and perpendicularly connected with a fixed support (12), and the end of the fixed support (12) is connected with a U-shaped pipe extension edge (13) through a universal ball (14), and the U-shaped pipe extension edge (13) is detachably surrounded on the side wall of the heat exchange tube (7) through the rotation of the baffle rod (10).

4. The heat exchanger with cathodic protection according to any one of claims 1 to 3, characterized in that The baffle rod (10) and the sacrificial anode rod (11) are provided with pin holes matched with the pin shaft (9).

5. The heat exchanger with cathodic protection according to claim 4, characterized in that The sacrificial anode arrangement method of the heat exchanger adopts the heat exchanger with cathodic protection, and the specific steps include: Step 1: placing the sacrificial anode connecting assembly between the parallel heat exchange tubes (7), penetrating the baffle rod (10) between the extension edges (8), and penetrating the sacrificial anode rod (11) in the baffle rod (10), Step 2: the baffle rod (10) and the sacrificial anode rod (11) are provided with pin holes matched with the pin shaft (9), the rotation of the pin shaft (9) drives the rotation of the baffle rod (10), and the baffle rod (10) and the sacrificial anode rod (11) are fixed on the baffle rod fixing ring (5) to realize electrical connection; Step 3: the side wall of the baffle rod (10) is symmetrically and perpendicularly connected with a fixed support (12), the end of the fixed support (12) is connected with a U-shaped pipe extension edge (13) through a universal ball (14), and the U-shaped pipe extension edge (13) is detachably surrounded on the side wall of the heat exchange tube (7) through the rotation of the baffle rod (10).

6. The heat exchanger with cathodic protection according to claim 5, characterized in that The sacrificial anode rod (11) of the heat exchanger is replaced, Step 4: dismount the first shell head (1) or the second shell head (3) of the heat exchanger shell (2) at both ends, and pull out the heat exchanger core from the heat exchanger shell (2) to the outside of the heat exchanger shell (2); Step 5: pull out the pin shaft (9), use the dismounting rod to push out the sacrificial anode rod (11) from the inside of the stopper (10), insert a new sacrificial anode rod (11) into the inside of the stopper (10), rotate the stopper (10) by rotating the pin shaft (9), and fix the stopper (10) and the sacrificial anode rod (11) in the stopper fixing ring (5) to realize electrical connection; Step 6: the side wall of the stopper (10) is symmetrically and perpendicularly connected with the fixed support (12), the end of the fixed support (12) is connected with the U-shaped pipe protection extension edge (13) through the universal ball (14), and the U-shaped pipe protection extension edge (13) rotates around the rotation shaft of the fixed support (12) to surround the side wall of the heat exchange pipe (7) by rotating the stopper (10).

7. The heat exchanger with cathodic protection according to claim 6, characterized in that The replacement method of the stopper of the heat exchanger: Step 7: pull out the pin shaft (9), and rotate the stopper (10) by rotating the pin shaft (9), so that the U-shaped pipe protection extension edge (13) rotates around the rotation shaft of the fixed support (12) and is separated from the side wall of the heat exchange pipe (7); Step 8: dismount the fixing bolt in the middle of the stopper fixing ring (5) and the extension edge (8) thereof, divide the stopper fixing ring (5) into two halves, and then pull out the two ends of the stopper (10) and the sacrificial anode rod (11) from the hole of the stopper fixing ring; Step 9: pull out the stopper (10) from the gap of the heat exchange pipe, dismount the fixed support (12) of the side wall of the stopper (10), fix the fixed support (12) to a new stopper (10), insert the new stopper (10) into the gap of the heat exchange pipe, rotate the stopper (10) to drive the fixed support (12) to make the U-shaped pipe protection extension edge (13) reattach to the heat exchange pipe; Step 10: put the stopper fixing ring (5) around the two ends of the stopper (10) from both sides, and then connect the two halves of the stopper fixing ring (5) and the extension edge (8) thereof into a ring by using a bolt.

8. The heat exchanger with cathodic protection according to claim 7, characterized in that The detachable connection mode of the fixed support (12), the side wall of the stopper (10), and the two halves of the stopper fixing ring (5) is screw connection or buckle connection.

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