Anti-corrosion structure of heat exchange tube of denitration heat recovery device

Abstract

The utility model relates to heat exchange pipe cleaning protection technical field discloses a kind of denitration heat recovery device heat exchange pipe anticorrosion structure, including heat exchange pipe main body, and the both ends of heat exchange pipe main body are connected with flush washing end head pipe in each side surface communication arrangement.The utility model, by being equipped with flush washing end head pipe in the both ends of heat exchange pipe main body, respectively first control valve body and second control valve body control open and close operation, flushing and heat exchange do not influence each other, external flushing equipment can be connected with two filter connecting barrels, from one end of heat exchange pipe main body to the other end, greatly reduce the residue and corrosion of impurity, energy saving and anticorrosion performance are excellent, protect heat exchange ring and strengthen heat exchange scale are all to pipe body play heat exchange strengthening and pipe wall strengthening effect, make device convenient to clean inside heat exchange pipe, impurity cleaning can be completed without disassembly, energy saving and anticorrosion performance are excellent, and pipe wall durability is strong, heat exchange efficiency and practicality are excellent.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger tube cleaning and protection technology, and in particular to a corrosion-resistant structure for heat exchanger tubes in a denitrification heat recovery unit. Background Technology

[0002] In industrial denitrification systems, the heat exchange tubes of the denitrification heat recovery unit are key components for achieving synergistic operation of heat recovery and flue gas denitrification. Their main function is to exchange heat between the medium flowing inside the tube and the high-temperature flue gas outside, recovering waste heat from the flue gas while simultaneously working with the denitrification device to remove nitrogen oxides, thereby improving energy efficiency and reducing pollutant emissions. However, because the heat exchange tubes are exposed to a complex environment of high temperature, corrosive gases containing sulfur and nitrogen, and dust particles for extended periods, the tubes are highly susceptible to corrosion. This not only shortens the service life of the heat exchange tubes but can also lead to media leakage due to corrosion perforation, affecting the stable operation of the entire denitrification heat recovery system. Therefore, designing an effective corrosion-resistant structure for the heat exchange tubes is particularly important.

[0003] In existing technologies, the heat exchange tubes of denitrification heat recovery units often suffer from problems during operation. Due to their monolithic design or complex connections, impurities carried by the flowing medium and deposits generated by chemical reactions accumulate inside the tubes, forming scale. Thorough disassembly and cleaning of the tubes becomes difficult. Without prolonged cleaning, this scale adheres to the inner wall, hindering medium flow and heat transfer, reducing heat exchange efficiency. Furthermore, the scale reacts electrochemically or chemically with the inner wall material, accelerating corrosion and significantly reducing the heat exchange tubes' corrosion resistance. This severely impacts their service life and the safe and stable operation of the system. The relatively inconvenient disassembly and assembly of the heat exchange tubes also hinders cleaning. Prolonged accumulation of scale further reduces the pipes' durability and heat exchange performance, resulting in relatively poor energy-saving performance and insufficient corrosion protection. Therefore, we propose a corrosion-resistant structure for the heat exchange tubes of denitrification heat recovery units to address these issues. Utility Model Content

[0004] In response to the problems raised, this utility model provides a corrosion-resistant structure for the heat exchange tube of a denitrification heat recovery unit to solve the aforementioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A corrosion-resistant structure for heat exchange tubes in a denitrification heat recovery unit includes a heat exchange tube body, wherein flushing and cleaning end tubes are connected to both ends of the heat exchange tube body. A filter connecting cylinder is provided on the side of each of the two flushing and cleaning end pipes away from the heat exchange tube body. A first control valve body is provided on each of the two flushing and cleaning end pipes. A second control valve body is provided at both ends of the heat exchange tube body. Protective heat exchange rings and enhanced heat exchange fins are provided at equal intervals on the tube body of the heat exchange tube body. Heat exchange fins are fixedly installed on the outside of the protective heat exchange rings. The heat exchange fins are evenly spaced on the outside of the heat exchange tube body.

[0006] Preferably, the flushing and cleaning end pipe is integrally connected and installed at both ends of the heat exchange tube body, and the first control valve body and the second control valve body are both electrically controlled valves, and the first control valve body and the second control valve body are coupled and matched.

[0007] Preferably, a threaded sleeve is fixedly installed at one end of the filter connecting cylinder, the threaded sleeve is threadedly sealed at the end of the flushing and cleaning end pipe, the filter connecting cylinder is threadedly connected to the flushing and cleaning end pipe by the threaded sleeve, and the filter connecting cylinder is provided with a sealing and filling filter element inside.

[0008] Preferably, the filter connecting cylinder is threadedly sealed with a sealing disassembly cover on the side away from the flushing and cleaning end pipe, and the sealing disassembly cover is provided with a bolted flange cover on the side away from the filter connecting cylinder. The sealing disassembly cover and the bolted flange cover are connected and form an integral unit. The sealing filler filter element is clamped and installed between the sealing disassembly cover and the threaded sleeve.

[0009] Preferably, the protective heat exchange ring is uniformly fitted and sleeved on the outside of the heat exchange tube body, and the outer side of the protective heat exchange ring is provided with a heat exchange groove. The heat exchange fins are snapped onto the heat exchange groove, and the heat exchange fins are snapped onto the protective heat exchange ring by the heat exchange groove.

[0010] Preferably, the reinforcing heat exchange fins are staggered between adjacent protective heat exchange rings, and an annular patch ring is provided at the inner ring of the reinforcing heat exchange fins, the annular patch ring being fitted and sleeved on the outside of the heat exchange tube body.

[0011] Preferably, the heat exchange fins are evenly spaced on the outside of the heat exchange tube body, and multiple protective heat exchange rings are vertically installed on the inside of the heat exchange fins. The heat exchange fins are made of copper or aluminum sheets.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. The anti-corrosion structure of the heat exchange tubes in this denitrification heat recovery unit features flushing and cleaning end pipes at both ends of the heat exchange tube body. Each flushing and cleaning end pipe is equipped with a first control valve, and each end of the heat exchange tube body is equipped with a second control valve. The first and second control valves are coupled together, ensuring that flushing and heat exchange do not interfere with each other. External flushing equipment can be connected to two filter connecting cylinders, connecting the flushing and cleaning end pipes and the heat exchange tube body for high-pressure flushing. Flushing proceeds from one end of the heat exchange tube body to the other. During flushing, impurities are filtered by the filter connecting cylinders, allowing the flushing liquid to be recycled. Cleaning can be performed without disassembling the pipes, greatly reducing impurity residue and corrosion. This results in excellent energy efficiency and corrosion resistance, facilitating internal cleaning of the heat exchange tubes without disassembly.

[0013] 2. The anti-corrosion structure of the heat exchange tubes of this denitrification heat recovery unit strengthens the protection of the tube body by setting protective heat exchange rings at equal intervals on the tube body. The protective heat exchange rings can be locked to install heat exchange fins, which improves the convenience of installation and heat exchange area, and has good energy saving. The strengthened heat exchange fins not only increase the heat exchange area, but also strengthen the tube wall, making it highly practical and durable. The heat exchange efficiency and practicality are excellent. Attached Figure Description

[0014] Figure 1 This utility model provides a frontal perspective three-dimensional schematic diagram of a corrosion-resistant structure for a heat exchange tube in a denitrification heat recovery device; Figure 2 This utility model provides a top-view perspective view of the corrosion-resistant structure of the heat exchange tube in a denitrification heat recovery device. Figure 3 This utility model provides a front view three-dimensional sectional view of the anti-corrosion structure of the heat exchange tube of a denitrification heat recovery device; Figure 4 This is a three-dimensional side view sectional view of the filter connecting cylinder and threaded sleeve connection structure of this utility model; Figure 5 This is a three-dimensional side view sectional view of the connection structure between the filter connecting cylinder and the sealed filling filter element of this utility model; Figure 6 This is a frontal perspective three-dimensional schematic diagram of the connection structure between the heat exchange ring and the heat exchange slot of this utility model; Figure 7 A schematic diagram of the heat exchange fin structure.

[0015] In the diagram: 1. Heat exchanger tube body; 2. Flushing and cleaning end tube; 3. Filter connecting cylinder; 31. Threaded sleeve; 32. Sealed filling filter element; 33. Sealed disassembly cover; 34. Bolted flange cover; 4. First control valve body; 5. Second control valve body; 6. Protective heat exchanger ring; 61. Heat exchanger slot; 7. Reinforced heat exchanger fins; 71. Annular patch ring; 8. Heat exchanger fin assembly. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0018] Please see Figures 1-7 A corrosion-resistant structure for heat exchange tubes in a denitrification heat recovery unit includes a heat exchange tube body 1, with flushing and cleaning end tubes 2 connected to both ends of the heat exchange tube body 1. A filter connecting cylinder 3 is provided on the side of the two flushing and cleaning end pipes 2 away from the heat exchange tube body 1. A first control valve body 4 is provided on the two flushing and cleaning end pipes 2. A second control valve body 5 is provided at both ends of the heat exchange tube body 1. A protective heat exchange ring 6 and a reinforcing heat exchange fin 7 are provided at equal intervals on the tube body of the heat exchange tube body 1. A heat exchange fin 8 is fixedly installed on the outside of the protective heat exchange ring 6. Among them, the heat exchange fins 8 are evenly arranged on the outside of the heat exchange tube body 1; The beneficial effects of this solution are as follows: By providing flushing and cleaning end pipes 2 at both ends of the heat exchange tube body 1, and providing a first control valve body 4 for each of the two flushing and cleaning end pipes 2, and providing a second control valve body 5 at both ends of the heat exchange tube body 1, the first control valve body 4 and the second control valve body 5 are coupled together. When the first control valve body 4 is open, the second control valve body 5 is closed, and when the second control valve body 5 is open, the first control valve body 4 is closed, so that flushing and heat exchange do not affect each other. The external flushing equipment can be connected to two filter connecting cylinders 3, and connected to the flushing and cleaning end pipe 2 and the heat exchange tube body 1 for high-pressure flushing operation. The flushing is carried out from one end of the heat exchange tube body 1 to the other end. During the flushing, the filter connecting cylinder 3 filters impurities, so that the flushing liquid can be recycled and cleaned without disassembling the pipeline. The heat exchange tube body 1 is provided with protective heat exchange rings 6 at equal intervals to strengthen the protection of the tube body. The protective heat exchange rings 6 can also be locked to install heat exchange fins 8, which improves the convenience of installation and heat exchange area, and has good energy efficiency. The heat exchange fins 7 not only increase the heat exchange area, but also strengthen the tube wall, making it easy to clean the inside of the heat exchange tube without disassembly. It has excellent energy efficiency and corrosion resistance, and the tube wall is durable. It has excellent heat exchange efficiency and practicality.

[0019] Furthermore, the flushing and cleaning end pipe 2 is integrally connected and installed at both ends of the heat exchange tube body 1. The first control valve body 4 and the second control valve body 5 are both electrically controlled valves, and the first control valve body 4 and the second control valve body 5 are coupled and matched. Specifically, the flushing and cleaning end pipe 2 is integrally connected and installed at both ends of the heat exchange tube body 1, which facilitates heat recovery and heat exchange or flushing and cleaning of the inner wall of the tube, greatly reducing the cleaning difficulty of the device. The inner wall can be cleaned without disassembly, preventing the accumulation of dirt and reducing the heat exchange efficiency. It also has good anti-corrosion protection. The first control valve body 4 and the second control valve body 5 are both electrically controlled valves and are coupled and matched. When the first control valve body 4 is open, the second control valve body 5 is closed, and when the second control valve body 5 is open, the first control valve body 4 is closed. Thus, flushing and heat exchange do not affect each other, the operation is stable and convenient, and the control effect is good.

[0020] Furthermore, a threaded sleeve 31 is fixedly installed at one end of the filter connecting cylinder 3. The threaded sleeve 31 is threadedly sealed at the end of the flushing and cleaning end pipe 2. The filter connecting cylinder 3 is threadedly connected to the flushing and cleaning end pipe 2 by the threaded sleeve 31. The filter connecting cylinder 3 is provided with a sealing and filling filter element 32 inside. Specifically, a threaded sleeve 31 is fixedly installed at one end of the filter connecting cylinder 3, which facilitates the filter connecting cylinder 3 to be threadedly connected and fixed to the flushing and cleaning end pipe 2. The installation and operation are convenient. The filter connecting cylinder 3 is equipped with a sealed filling filter element 32 inside, which plays a filtering and rinsing role when the cleaning liquid passes through. Thus, when the flushing equipment is circulating and rinsing, both sealed filling filter elements 32 can play a role in filtering dirt, preventing excessive dirt from contaminating the cleaning liquid, which is relatively economical. The sealed filling filter element 32 is easy to disassemble and install, and is convenient for subsequent cleaning.

[0021] Furthermore, a sealing and disassembly cover 33 is threadedly connected to the side of the filter connecting cylinder 3 away from the flushing and cleaning end pipe 2. A bolted flange cover 34 is provided on the side of the sealing and disassembly cover 33 away from the filter connecting cylinder 3. The sealing and disassembly cover 33 and the bolted flange cover 34 are connected and form a whole. The sealing and filling filter element 32 is clamped and installed between the sealing and disassembly cover 33 and the threaded sleeve 31. Specifically, the filter connecting cylinder 3 is threadedly sealed with a sealing and disassembly cover 33 on the side away from the flushing and cleaning end pipe 2. The sealing and disassembly cover 33 and the bolted flange cover 34 are an integral unit. The bolted flange cover 34 facilitates connection with external flushing equipment, and the sealing and disassembly cover 33 is easy to install on the flushing and cleaning end pipe 2. After the sealing and disassembly cover 33 is removed, the sealed filling filter element 32 inside the flushing and cleaning end pipe 2 can be disassembled and cleaned, making it convenient to use.

[0022] Furthermore, the protective heat exchange ring 6 is uniformly fitted and sleeved on the outside of the heat exchange tube body 1. The outer side of the protective heat exchange ring 6 is provided with a heat exchange groove 61. The heat exchange fin 8 is snapped onto the heat exchange groove 61. The heat exchange fin 8 is snapped onto the protective heat exchange ring 6 by the heat exchange groove 61. Specifically, the heat exchange ring 6 is uniformly fitted and sleeved on the outside of the heat exchange tube body 1, which protects the tube body from cracking and corrosion, while increasing the heat exchange area and improving the heat exchange efficiency. The setting of the heat exchange slot 61 makes it easy to snap and install the heat exchange fins 8, which improves the installation convenience and heat exchange area, further improves the heat exchange efficiency, and makes it convenient to use.

[0023] Furthermore, the enhanced heat exchange fins 7 are staggered between adjacent protective heat exchange rings 6, and the inner ring of the enhanced heat exchange fins 7 is provided with an annular patch ring 71, which is fitted and sleeved on the outside of the heat exchange tube body 1. Specifically, the enhanced heat exchange fins 7 are staggered between adjacent protective heat exchange rings 6. The enhanced heat exchange fins 7 play a role in strengthening the fixation and improving the installation tightness of the pipeline. In addition, the inner ring of the enhanced heat exchange fins 7 is provided with annular patch rings 71, which increases the connection area with the pipe body, resulting in good heat exchange effect and strong protection capability.

[0024] Furthermore, the heat exchange fins 8 are evenly spaced on the outside of the heat exchange tube body 1, and multiple protective heat exchange rings 6 are vertically installed on the inside of the heat exchange fins 8. The heat exchange fins 8 are made of copper or aluminum sheets. Specifically, the heat exchange fins 8 are evenly spaced on the outside of the heat exchange tube body 1, which makes installation convenient and stable, and provides good heat exchange effect. The protective heat exchange ring 6 is installed vertically on the inside of the heat exchange fins 8, which provides good installation tightness. The heat exchange fins 8 are made of copper or aluminum sheets, which are simple to manufacture, have high heat exchange efficiency, and are convenient to use.

[0025] How to use and how to work this device: By providing flushing and cleaning end pipes 2 at both ends of the heat exchange tube body 1, and a first control valve 4 at the pipe body of the flushing and cleaning end pipe 2, when the heat exchange tube body 1 is performing denitrification heat energy recovery operation, the first control valve 4 can control the flushing and cleaning end pipe 2 to close the pipe and perform heat exchange and heat recovery operation. A second control valve 5 is provided at both ends of the heat exchange tube body 1. When it is necessary to flush the inner wall of the heat exchange tube body 1, the two second control valves 5 can be used to close both ends of the heat exchange tube body 1 respectively. The first control valve 4 and the second control valve 5 are coupled. When the first control valve 4 is open, the second control valve 5 is closed, and when the second control valve 5 is open, the first control valve 4 is closed, so that flushing and heat exchange do not affect each other. When the heat exchange operation is stopped, the ends of the two flushing and cleaning end pipes 2 are equipped with filter connecting cylinders 3. The external flushing equipment can be connected to the two filter connecting cylinders 3 to perform high-pressure circulating flushing. The water source is introduced into the heat exchange tube body 1 through one of the filter connecting cylinders 3 and then discharged through the other filter connecting cylinder 3, which serves as a water source flushing operation to prevent the residue of dirt inside the heat exchange tube body 1. The dirt and impurities remaining on the inner wall can be washed with water or cleaned by other liquid methods. The filter connecting cylinder 3 plays a role in filtering dirt and impurities during cleaning, so the cleaning water can be reused multiple times, which is convenient to use. The cleaning inside the pipe is convenient and can be completed without disassembly, which greatly reduces the residue of impurities and corrosion. It has excellent energy saving and corrosion resistance. The heat exchange tube body 1 is provided with protective heat exchange rings 6 and reinforcing heat exchange fins 7 at equal intervals. Both of them can strengthen the protection of the tube body and increase the service life. The protective heat exchange rings 6 can be locked to install heat exchange fins 8, which improves the convenience of installation and heat exchange area, further improves heat exchange efficiency and energy saving. The reinforcing heat exchange fins 7 not only increase the heat exchange area, but also strengthen the tube wall, which is highly practical. The flushing and cleaning end pipe 2 is integrally connected and installed at both ends of the heat exchange tube body 1, which facilitates heat energy recovery and heat exchange or internal wall flushing and cleaning of the tube, greatly reducing the cleaning difficulty of the device. The internal wall cleaning can be completed without disassembly, preventing the accumulation of dirt and reducing heat exchange efficiency. It has good anti-corrosion protection. The first control valve body 4 and the second control valve body 5 are both electrically controlled valves and are coupled and matched. When the first control valve body 4 is open, the second control valve body 5 is closed, and when the second control valve body 5 is open, the first control valve body 4 is closed. Thus, flushing and heat exchange do not affect each other, the operation is stable and convenient, and the control effect is good. One end of the filter connecting cylinder 3 is fixedly installed with a threaded sleeve 31, which facilitates the filter connecting cylinder 3 to be threadedly connected and fixed to the flushing and cleaning end pipe 2. The installation and operation are convenient. The filter connecting cylinder 3 is equipped with a sealed filling filter element 32 inside, which plays a filtering and rinsing role when the cleaning liquid passes through. Thus, when the flushing equipment is circulating and rinsing, both sealed filling filter elements 32 can play a role in filtering dirt, preventing excessive dirt from contaminating the cleaning liquid, which is relatively economical. The sealed filling filter element 32 is easy to disassemble and install, and is easy to clean later. The filter connecting cylinder 3 is threadedly sealed with a sealing disassembly cover 33 on the side away from the flushing and cleaning end pipe 2. The sealing disassembly cover 33 and the bolted flange cover 34 are an integral unit. The bolted flange cover 34 facilitates connection with external flushing equipment, and the sealing disassembly cover 33 is easy to install on the flushing and cleaning end pipe 2. After the sealing disassembly cover 33 is removed, the sealed filling filter element 32 inside the flushing and cleaning end pipe 2 can be disassembled and cleaned, which is convenient to use. The heat exchange ring 6 is uniformly fitted and sleeved on the outside of the heat exchange tube body 1, which protects the tube body from cracking and corrosion. At the same time, it increases the heat exchange area and improves the heat exchange efficiency. The heat exchange slot 61 facilitates the snap-fit ​​installation of the heat exchange fins 8, which improves the installation convenience and heat exchange area, further improves the heat exchange efficiency, and makes it convenient to use. The heat exchange fins 7 are staggered between adjacent protective heat exchange rings 6. The heat exchange fins 7 play a role in strengthening the fixation and improving the installation tightness of the pipeline. In addition, the inner ring of the heat exchange fins 7 is provided with an annular patch ring 71, which increases the connection area with the pipe body, resulting in good heat exchange effect and strong protection capability. The heat exchange fins 8 are evenly spaced on the outside of the heat exchange tube body 1, which makes installation convenient and stable, and provides good heat exchange effect. The heat exchange ring 6 is installed vertically on the inside of the heat exchange fins 8, which provides good installation tightness. The heat exchange fins 8 are made of copper or aluminum sheets, which are simple to manufacture, have high heat exchange efficiency, and are convenient to use. This device facilitates cleaning of the inside of the heat exchange tubes without disassembly, offering excellent energy efficiency and corrosion resistance, as well as strong tube wall durability, resulting in superior heat exchange efficiency and practicality.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A corrosion-resistant structure for heat exchange tubes in a denitrification heat recovery unit, comprising a heat exchange tube body (1), characterized in that: Both ends of the heat exchange tube body (1) are connected to flushing and cleaning end tubes (2). Each of the two flushing and cleaning end pipes (2) is provided with a filter connecting cylinder (3) on the side away from the heat exchange tube body (1). Each of the two flushing and cleaning end pipes (2) is provided with a first control valve body (4). Each of the two ends of the heat exchange tube body (1) is provided with a second control valve body (5). The heat exchange tube body (1) is provided with a protective heat exchange ring (6) and a heat exchange fin (7) at equal intervals. The heat exchange ring (6) is fixedly installed with a heat exchange fin (8). The heat exchange fins (8) are arranged at equal intervals outside the heat exchange tube body (1).

2. The anti-corrosion structure for heat exchange tubes of a denitrification heat recovery unit according to claim 1, characterized in that: The flushing and cleaning end pipe (2) is integrally connected and installed at both ends of the heat exchange tube body (1). The first control valve body (4) and the second control valve body (5) are both electric control valves, and the first control valve body (4) and the second control valve body (5) are coupled and matched.

3. The anti-corrosion structure for heat exchange tubes of a denitrification heat recovery unit according to claim 1, characterized in that: A threaded sleeve (31) is fixedly installed at one end of the filter connecting cylinder (3). The threaded sleeve (31) is threadedly sealed at the end of the flushing and cleaning end pipe (2). The filter connecting cylinder (3) is threadedly connected to the flushing and cleaning end pipe (2) by the threaded sleeve (31). The filter connecting cylinder (3) is provided with a sealed filling filter element (32) inside.

4. The anti-corrosion structure for heat exchange tubes of a denitrification heat recovery unit according to claim 3, characterized in that: The filter connecting cylinder (3) is threadedly sealed with a sealing disassembly cover (33) on the side away from the flushing and cleaning end pipe (2). The sealing disassembly cover (33) is provided with a bolted flange cover (34) on the side away from the filter connecting cylinder (3). The sealing disassembly cover (33) and the bolted flange cover (34) are connected and form a whole. The sealing filling filter element (32) is clamped and installed between the sealing disassembly cover (33) and the threaded sleeve (31).

5. The anti-corrosion structure for heat exchange tubes of a denitrification heat recovery unit according to claim 1, characterized in that: The protective heat exchange ring (6) is uniformly fitted and sleeved on the outside of the heat exchange tube body (1). The outer side of the protective heat exchange ring (6) is provided with a heat exchange groove (61). The heat exchange fin (8) is engaged and installed on the heat exchange groove (61). The heat exchange fin (8) is engaged and installed on the protective heat exchange ring (6) by the heat exchange groove (61).

6. The anti-corrosion structure for heat exchange tubes of a denitrification heat recovery unit according to claim 1, characterized in that: The enhanced heat exchange fins (7) are staggered between adjacent protective heat exchange rings (6). The inner ring of the enhanced heat exchange fins (7) is provided with an annular patch ring (71), which is fitted and sleeved on the outside of the heat exchange tube body (1).

7. The anti-corrosion structure for heat exchange tubes of a denitrification heat recovery unit according to claim 1, characterized in that: The heat exchange fins (8) are evenly spaced outside the heat exchange tube body (1), and multiple protective heat exchange rings (6) are vertically installed on the inner side of the heat exchange fins (8). The heat exchange fins (8) are copper sheets or aluminum sheets.

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