Smoke exhaust pipeline waste heat recovery device of boiler

Abstract

The invention relates to the field of waste heat recovery production, and particularly discloses a boiler smoke exhaust pipeline waste heat recovery device which comprises a waste heat recovery pipe, a plate type heat exchange set and a spiral heat exchange set, a transmission connecting pipe is arranged at the left end of the waste heat recovery pipe, and two temperature sensing arrays are arranged at the two ends of the left side in the waste heat recovery pipe; a waste heat baffle is arranged in the waste heat recovery pipe, a plate type heat exchange set is arranged on the right side of the waste heat recovery pipe, a drying chamber is arranged on the right side of the plate type heat exchange set, and a spiral heat exchange set is arranged at the end, away from the plate type heat exchange set, of the right side of the waste heat recovery pipe. According to the device, multi-stage recovery structures such as the waste heat blocking plate, the plate type heat exchange set and the spiral heat exchange set are introduced, deep recovery and efficient utilization of boiler waste heat are achieved, the waste heat blocking plate can intelligently adjust the heat energy flowing path according to real-time temperature data, it is ensured that high-temperature waste gas can be accurately distributed into different heat exchange assemblies, and the heat exchange efficiency is improved. Therefore, the waste heat in the waste gas is extracted to the maximum extent.

Description

Technical Field

[0001] The invention relates to the field of waste heat recovery, and in particular to a waste heat recovery device for a smoke exhaust pipe of a boiler. Background Art

[0002] Boiler waste heat recovery device refers to equipment specially designed to capture and recycle the residual heat energy in the boiler exhaust gas. In the industrial production process, the boiler is a key link in energy conversion, and the flue gas generated by its combustion often carries a large amount of under-utilized heat energy. If this part of heat energy is directly discharged into the atmosphere, it will not only lead to a huge waste of energy, but also increase the heat load of the environment and promote the greenhouse effect. Therefore, the development of efficient and reliable boiler waste heat recovery devices is of great significance to improving energy utilization efficiency, reducing carbon emissions and promoting sustainable development. With the intensification of the global energy crisis and increasingly stringent environmental protection regulations, maximizing the recovery of boiler waste heat has become an important issue to be solved in the industry.

[0003] Traditionally, the industry has adopted direct discharge or simple heat exchange methods to deal with boiler waste heat, such as preheating the air required for combustion through an air preheater. However, these methods often have low recovery efficiency and cannot fully capture the low-temperature thermal energy in the flue gas. In addition, traditional waste heat recovery devices often have problems in design, such as complex structure, high maintenance cost, and poor adaptability, which limit their wide application under different working conditions. More importantly, these technologies often ignore the comprehensive utilization of other resources in the flue gas besides thermal energy, resulting in further waste of resources. In the long run, it not only aggravates the contradiction between energy supply and demand, but also has a significant negative impact on the ecological environment. Therefore, exploring new and efficient boiler waste heat recovery technologies to overcome the limitations of traditional technologies has become the key to promoting green industrial development and achieving energy conservation and emission reduction goals. To this end, the present invention proposes a waste heat recovery device for a boiler exhaust pipe. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a waste heat recovery device for a smoke exhaust pipe of a boiler, which solves the above-mentioned problems.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a waste heat recovery device for a flue gas exhaust pipe of a boiler, comprising a waste heat recovery pipe, a plate heat exchange group and a spiral heat exchange group, the left end of the waste heat recovery pipe is provided with a transmission connecting pipe, the left ends of the waste heat recovery pipe are provided with two groups of temperature sensor arrays, the waste heat recovery pipe is provided with a waste heat baffle plate, the right side of the waste heat recovery pipe is provided with a plate heat exchange group, the right side of the plate heat exchange group is provided with a drying chamber, the right end of the waste heat recovery pipe away from the plate heat exchange group is provided with a spiral heat exchange group, and the right side of the spiral heat exchange group is provided with a dehydration chamber; The plate heat exchange group includes a plate heat exchanger, a first waste heat shunt pipe, and a first waste heat transfer pipe. The first waste heat shunt pipe is provided at the top left side of the plate heat exchanger, and the first waste heat transfer pipe is provided at the bottom right side of the plate heat exchanger. The spiral heat exchange group includes a spiral fin heat exchanger, a second waste heat shunt pipe, a spiral fin heat exchange pipe, a bend pipe, and a second waste heat transfer pipe. The left side of the spiral fin heat exchanger is provided with a second waste heat shunt pipe, the inner side of the spiral fin heat exchanger is provided with a spiral fin heat exchange pipe, both sides of the spiral fin heat exchanger are provided with bend pipes, and the right bottom end of the spiral fin heat exchanger is provided with a second waste heat transfer pipe. One end of the bend pipe extends to the inside of the spiral fin heat exchanger and is connected to the spiral fin heat exchange pipe, and the two groups of bend pipes are installed in a staggered manner. The outer side of the spiral fin heat exchange pipe adopts an asymmetric fin tube design, and the spacing of the flying stack fin heat exchange pipes on the outer side of the spiral fin heat exchange pipe gradually decreases from left to right.

[0006] Preferably, a driving motor is provided at the bottom of the waste heat recovery pipe, the output end of the driving motor extends into the interior of the waste heat recovery pipe and is connected to the waste heat barrier plate, and a low-temperature recovery pipe is provided at the top right side of the waste heat recovery pipe, and the low-temperature recovery pipe includes a control valve and a recovery pipe.

[0007] Preferably, both ends of the waste heat barrier plate are in contact with the inner side of the waste heat recovery pipe, and a rubber pad is provided at one end of the waste heat barrier plate.

[0008] Preferably, the left end of the first waste heat diversion pipe is fixedly connected to the waste heat recovery pipe, and the right end of the first waste heat transmission pipe is fixedly connected to the left bottom of the drying chamber.

[0009] Preferably, the drying chamber and the dehydration chamber have the same internal structure.

[0010] Preferably, the output end of the second waste heat diversion pipe extends to the interior of the spiral fin heat exchanger and is connected to the spiral fin heat exchange tube.

[0011] Preferably, a right end of the top inking roller is connected to an input end of a pulley, and a right end of the bottom inking roller is connected to an output end of a pulley.

[0012] Preferably, a liquid crystal control screen is provided on the left side of the dehydration chamber, a low-level placement board is provided at the bottom of the dehydration chamber, a middle-level placement board is provided at the top of the dehydration chamber away from the low-level placement board, and a high-level placement board is provided at the top of the dehydration chamber away from the middle-level placement board.

[0013] Preferably, a plurality of groups of through holes are equidistantly provided on the tops of the lower placement plates, the middle placement plates, and the upper placement plates, and the diameters of the through holes increase gradually from bottom to top.

[0014] Compared with the prior art, the present invention provides a waste heat recovery device for a boiler exhaust pipe, which has the following beneficial effects: This device realizes the deep recovery and efficient utilization of boiler waste heat by introducing multi-stage recovery structures such as waste heat barrier plates, plate heat exchange groups and spiral heat exchange groups. The waste heat barrier plates can intelligently adjust the heat energy flow path according to real-time temperature data to ensure that high-temperature exhaust gas can be accurately diverted to different heat exchange components, thereby maximizing the extraction of waste heat in the exhaust gas. The plate heat exchange group and spiral heat exchange group further improve the heat exchange efficiency through their respective unique heat exchange structures. The above-mentioned multi-stage recovery and utilization system not only significantly improves energy utilization, but also effectively reduces energy waste, bringing significant economic benefits to the enterprise.

[0015] This device has also been significantly optimized in terms of heat energy flow path and heat exchange efficiency. The introduction of components such as waste heat baffles, curved flow tubes and asymmetric finned tubes enables heat energy to be more fully transferred to the working medium, thereby improving the heat energy recovery rate. At the same time, the ingenious design of the above components also makes the heat energy flow path more tortuous, increasing the contact time and area between the exhaust gas and the heat exchange tube, further improving the heat exchange efficiency.

[0016] This device further reduces production costs through multi-stage utilization of waste heat. In the drying chamber and dehydration chamber, the materials are dried and dehydrated by utilizing low and high temperature waste heat respectively, thereby maximizing the utilization of waste heat. The above multi-stage utilization method not only improves energy utilization, but also reduces additional energy consumption and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional cross-sectional structure of the waste heat recovery pipe of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the waste heat recovery pipe of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the plate heat exchange group of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the spiral heat exchange group of the present invention; Figure 6 For the present invention Figure 5 The structural diagram at A in the middle; Figure 7 It is a schematic diagram of the three-dimensional structure of the dehydration chamber of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the structure at point B in the middle.

[0018] In the figure: 1. waste heat recovery pipe; 101. transmission connecting pipe; 102. temperature sensor array; 103. drive motor; 104. low-temperature recovery pipe; 2. waste heat barrier plate; 3. plate heat exchange group; 301. plate heat exchanger; 302. first waste heat diversion pipe; 303. first waste heat transmission pipe; 4. drying chamber; 5. spiral heat exchange group; 501. spiral fin heat exchanger; 502. second waste heat diversion pipe; 503. spiral fin heat exchange pipe; 504. bend pipe; 505. second waste heat transmission pipe; 6. dehydration chamber; 601. LCD control panel; 602. low-level placement board; 603. middle-level placement board; 604. high-level placement board. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-8 A waste heat recovery device for a flue gas exhaust pipe of a boiler comprises a waste heat recovery pipe 1, a plate heat exchange group 3 and a spiral heat exchange group 5, a transmission connection pipe 101 is arranged at the left end of the waste heat recovery pipe 1, two sets of temperature sensor arrays 102 are arranged at both ends of the left side of the waste heat recovery pipe 1, a waste heat baffle plate 2 is arranged inside the waste heat recovery pipe 1, a plate heat exchange group 3 is arranged on the right side of the waste heat recovery pipe 1, a drying chamber 4 is arranged on the right side of the plate heat exchange group 3, a spiral heat exchange group 5 is arranged on the right side of the waste heat recovery pipe 1 away from the plate heat exchange group 3, and a dehydration chamber 6 is arranged on the right side of the spiral heat exchange group 5; The plate heat exchange group 3 includes a plate heat exchanger 301, a first waste heat shunt pipe 302, and a first waste heat transfer pipe 303. The first waste heat shunt pipe 302 is provided at the top left side of the plate heat exchanger 301, and the first waste heat transfer pipe 303 is provided at the bottom right side of the plate heat exchanger 301. The spiral heat exchange group 5 includes a spiral fin heat exchanger 501, a second waste heat shunt pipe 502, a spiral fin heat exchange pipe 503, a bend pipe 504, and a second waste heat transfer pipe 505. The left side of the spiral fin heat exchanger 501 is provided with a second waste heat shunt pipe 502, the inner side of the spiral fin heat exchanger 501 is provided with a spiral fin heat exchange pipe 503, and both sides of the spiral fin heat exchanger 501 are provided with bend pipes 504, and the right bottom end of the spiral fin heat exchanger 501 is provided with a second waste heat transfer pipe 505. One end of the bend pipe 504 extends to the inside of the spiral fin heat exchanger 501 and is connected to the spiral fin heat exchanger 505. Tube 503 is connected, and two groups of curved flow tubes 504 are installed in an offset manner. The outer side of the spiral fin heat exchange tube 503 adopts an asymmetric fin tube design, and the spacing of the flying fin heat exchange tubes on the outer side of the spiral fin heat exchange tube 503 gradually decreases from left to right. The outer side of the spiral fin heat exchange tube adopts an asymmetric fin tube design, and the outer side fin spacing gradually decreases from left to right, which further improves the heat exchange efficiency. The asymmetric fin tube design increases the heat exchange area, and the gradual decrease in the fin spacing forms a gradient heat exchange effect, so that the heat energy can be more fully transferred to the working medium, thereby improving the heat energy recovery rate.

[0021] A driving motor 103 is provided at the bottom of the waste heat recovery pipe 1. The output end of the driving motor 103 extends to the inside of the waste heat recovery pipe 1 and is connected to the waste heat baffle 2. A low-temperature recovery pipe 104 is provided at the top right of the waste heat recovery pipe 1. The low-temperature recovery pipe 104 includes a control valve and a recovery pipe. The introduction of the driving motor 103 realizes the dynamic adjustment of the waste heat baffle 2, and can intelligently adjust the heat energy flow path according to the real-time temperature data, thereby optimizing the heat exchange efficiency. Secondly, the setting of the low-temperature recovery pipe 104 enables secondary recovery of waste heat gas with a lower temperature but still useful value during the heat recovery process, further improving energy utilization and reducing energy waste.

[0022] The two ends of the waste heat barrier plate 2 are fitted with the inner side of the waste heat recovery pipe 1, and a rubber pad is provided at one end of the waste heat barrier plate 2. The design of the two ends of the waste heat barrier plate 2 being fitted with the inner side of the waste heat recovery pipe 1 and a rubber pad at one end ensures the sealing of the waste heat barrier plate 3 during movement, prevents heat energy leakage, and improves heat exchange efficiency. The addition of the rubber pad not only enhances the sealing effect, but also improves the durability and service life of the waste heat barrier plate 2, and reduces maintenance costs.

[0023] The left end of the first waste heat shunt pipe 302 is fixedly connected to the waste heat recovery pipe 1, the right end of the first waste heat transfer pipe 303 is fixedly connected to the left bottom of the drying chamber 4, the left end of the first waste heat shunt pipe is fixedly connected to the waste heat recovery pipe, and the right end of the first waste heat transfer pipe is fixedly connected to the left bottom of the drying chamber, which realizes the effective transmission and utilization of heat energy. This fixed connection method ensures the stability and reliability of heat energy transmission and avoids heat energy loss caused by loose connection or leakage. At the same time, the heat energy is directly input to the bottom of the drying chamber, which is conducive to the uniform distribution of heat energy and improves the drying efficiency.

[0024] The drying chamber 4 has the same internal structure as the dehydration chamber 6. This design not only simplifies the equipment structure and reduces the manufacturing cost, but also facilitates the maintenance and upgrading of the equipment. At the same time, due to the similarity of the internal structures of the drying chamber and the dehydration chamber, operators can more easily master equipment operation and maintenance skills, thereby improving work efficiency.

[0025] The output end of the second waste heat diversion pipe 502 extends to the interior of the spiral fin heat exchanger 501 and is connected to the spiral fin heat exchange tube 503. The output end of the second waste heat diversion pipe extends to the interior of the spiral fin heat exchanger and is connected to the spiral fin heat exchange tube. One end of the bend pipe also extends to the interior of the spiral fin heat exchanger and is connected to the spiral fin heat exchange tube. The two groups of bend pipes are designed to be staggered, which optimizes the heat energy flow path and improves the heat exchange efficiency. The staggered bend pipes help to reduce flow resistance, promote uniform distribution of heat energy, and enhance the heat exchange effect.

[0026] A liquid crystal control screen 601 is provided on the left side of the dehydration chamber 6, a low-level placement board 602 is provided at the bottom of the dehydration chamber 6, a middle-level placement board 603 is provided at the top of the dehydration chamber 6 away from the low-level placement board 602, and a high-level placement board 604 is provided at the top of the dehydration chamber 6 away from the middle-level placement board 603. A liquid crystal control screen is provided on the left side of the dehydration chamber, and the design of low-level, middle-level and high-level placement boards is provided inside, which realizes the intelligent control and efficient dehydration of the equipment. The liquid crystal control screen provides an intuitive operation interface and monitoring function, so that the operator can understand the operation status of the equipment in real time and make adjustments. At the same time, the design of the layered placement boards enables the materials to be evenly dehydrated under different humidity conditions, thereby improving the dehydration efficiency and material quality.

[0027] The tops of the lower placement plates 602, the middle placement plates 603, and the upper placement plates 604 are evenly spaced with multiple groups of through holes, and the diameters of the through holes gradually increase from bottom to top. The design of evenly spaced multiple groups of through holes on the tops of the lower, middle, and upper placement plates, and the diameters of the through holes gradually increase from bottom to top, further optimizes the dehydration effect. This design allows the material to be better ventilated and heat-dissipated during the dehydration process, avoiding material damage caused by local overheating. At the same time, the gradual increase in the diameter of the through holes helps to provide appropriate ventilation conditions at different dehydration stages, thereby improving the dehydration efficiency and material quality.

[0028] Working principle: At the left end of the waste heat recovery pipe 1, the transmission connecting pipe 101 is tightly connected, and the high-temperature exhaust gas generated by the operation of the boiler flows smoothly into the waste heat recovery pipe 1 along the transmission connecting pipe 101. Two sets of temperature sensor arrays 102 are distributed at the two ends of the left side inside the waste heat recovery pipe 1. Through the linkage between the temperature sensor array 102 and the waste heat recovery pipe 1, the temperature of the exhaust gas entering the waste heat recovery pipe 1 can be monitored in real time and accurately. When the temperature sensor array 102 detects that the exhaust gas temperature is too high, the control system will make the following specific reactions: through the linkage between the drive motor 103 and the waste heat baffle plate 2, the drive motor 103 quickly receives the instruction, and its output end drives the waste heat baffle plate 2 to rotate and adjust in the waste heat recovery pipe 1, and the two ends of the waste heat baffle plate 2 are connected to the waste heat recovery pipe 1. The inner side of the heat recovery pipe 1 fits tightly, and a rubber pad is provided at one end, so that the over-temperature exhaust gas is transmitted to the spiral heat exchange group 5, and the waste heat is transmitted to the dehydration chamber 6 through the spiral heat exchange group 5, and the over-temperature exhaust gas is used to dehydrate the material, so as to maximize the use of the waste heat of the exhaust gas. On the contrary, when it is detected that the exhaust temperature is too low, the control system will control the drive motor 103 to drive the waste heat barrier plate 2 to rotate to the left and fit tightly to one side of the waste heat recovery pipe 1, so that the exhaust gas quickly enters the plate heat exchange group 3, and the lower temperature waste heat is transmitted to the drying chamber 4 through the plate heat exchange group 2, so as to use the lower temperature waste heat to dry the material in the drying chamber 4. On the right side of the waste heat recovery pipe 1, the plate heat exchange group 3 is arranged in order, and the plate heat exchange group 3 includes plate The plate heat exchanger 301, the first waste heat diversion pipe 302, and the first waste heat transfer pipe 303 are connected. The left end of the first waste heat diversion pipe 302 is firmly connected to the waste heat recovery pipe 1. Through the linkage between the waste heat recovery pipe 1 and the first waste heat diversion pipe 302, part of the high-temperature exhaust gas in the waste heat recovery pipe 1 is accurately diverted to the first waste heat diversion pipe 302, and then smoothly enters the plate heat exchanger 301. Heat is continuously transferred from the high-temperature exhaust gas to the low-temperature medium. The temperature of the exhaust gas after the heat exchange is significantly reduced, and then it is output through the first waste heat transfer pipe 303. The right end of the first waste heat transfer pipe 303 is firmly connected to the left bottom of the drying chamber 4. The cooled exhaust gas enters the drying chamber 4 and the drying operation is started. This linkage successfully realizes the partial heat recovery of the exhaust gas in the waste heat recovery pipe 1. The waste gas after heat exchange of the plate heat exchange group 3 enters the drying chamber 4 through the first waste heat transmission pipe 303. The interior of the drying chamber 4 is provided with a scientific and reasonable space structure according to the needs of material drying, which fully contacts the material placed therein, takes away the moisture in the material one by one, and realizes the drying process of the material. This linkage achieves the efficient utilization of waste heat in the drying process, makes the waste heat get secondary utilization, avoids the consumption of extra energy, and reduces the production cost. Secondly, the drying chamber 4 has the same internal structure as the dehydration chamber 6.This provides a very similar hardware basic condition for the subsequent dehydration chamber 6 to utilize the waste heat. On the right side of the waste heat recovery pipe 1, away from the end of the plate heat exchange group 3, the spiral heat exchange group 5 is ready. The spiral heat exchange group 5 includes a spiral fin heat exchanger 501, a second waste heat diversion pipe 502, a spiral fin heat exchange pipe 503, a bend pipe 504, and a second waste heat transmission pipe 505. The left end of the second waste heat diversion pipe 502 is tightly connected to the waste heat recovery pipe 1. Through the linkage between the waste heat recovery pipe 1 and the second waste heat diversion pipe 502, another part of the high-temperature exhaust gas in the waste heat recovery pipe 1 is diverted to the second waste heat diversion pipe 502 and quickly enters the spiral fin heat exchanger 501. In the spiral fin heat exchanger 501, the high-temperature exhaust gas and the low-temperature medium in the spiral fin heat exchange pipe 503 are expanded. In order to achieve a more intense heat exchange, the output end of the second waste heat diversion pipe 502 extends to the inside of the spiral fin heat exchanger 501 and realizes seamless connection with the spiral fin heat exchange tube 503. One end of the bend pipe 504 also extends to the inside of the spiral fin heat exchanger 501 and connects with the spiral fin heat exchange tube 503, and the two groups of bend pipes 504 are cleverly arranged with staggered installation. This unique structural design makes the flow path of the exhaust gas in the spiral fin heat exchanger 501 become tortuous, like shuttling through a maze, which greatly increases the contact time and area between the exhaust gas and the spiral fin heat exchange tube 503, greatly improving the heat exchange efficiency. The exhaust gas after heat exchange is output through the second waste heat transmission pipe 505. This linkage realizes further recovery of the heat of the exhaust gas in the waste heat recovery pipe 1. The spiral heat exchanger group 5 and the dehydration chamber 6 also form an efficient linkage. The waste gas after heat exchange by the spiral heat exchanger group 5 is output through the second waste heat transfer pipe 505 and smoothly enters the dehydration chamber 6. The dehydration chamber 6 is provided with a low-level placement plate 602, a middle-level placement plate 603 and a high-level placement plate 604. There are multiple groups of through holes equidistantly distributed on the top of these placement plates, and the diameter of the through holes is gradually increased from bottom to top. In the process of rising in the dehydration chamber, the waste heat exhaust gas passes through these through holes of different sizes and has full contact with the materials placed on the placement plates in all directions and at multiple levels, so that the moisture in the materials is completely taken away to achieve the dehydration of the materials. At the same time, the liquid crystal control arranged on the left side of the dehydration chamber 6 Screen 601 can monitor and precisely control the dehydration process in real time to ensure that the dehydration effect remains stable. This linkage realizes the efficient use of waste heat in the dehydration process, adding strong practicality and functionality to the entire waste heat recovery device. The entire boiler waste heat recovery device is closely coordinated and linked with each component, such as the waste heat recovery pipe 1, the temperature sensor array 102, the drive motor 103, the waste heat barrier plate 2, the plate heat exchange group 3, the drying chamber 4, the spiral heat exchange group 5, and the dehydration chamber 6, to build a complete multi-stage recovery and utilization system for boiler waste heat. This not only greatly improves the energy utilization rate and effectively reduces energy waste, but also effectively reduces production costs, bringing significant economic benefits to the enterprise, but also contributes to environmental protection.It meets the needs of the era of green development. Through precise temperature monitoring and the coordinated work of various components, it can ensure that waste heat can be fully utilized in all links, maximize the waste heat recovery efficiency, and provide solid and strong technical support for the sustainable development of industrial production.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for a boiler exhaust pipe, comprising a waste heat recovery pipe (1), a plate heat exchange group (3) and a spiral heat exchange group (5), characterized in that: The left end of the waste heat recovery pipe (1) is provided with a transmission connection pipe (101), the two ends of the left side of the waste heat recovery pipe (1) are provided with two groups of temperature sensor arrays (102), the waste heat recovery pipe (1) is provided with a waste heat baffle (2), the right side of the waste heat recovery pipe (1) is provided with a plate heat exchange group (3), the right side of the plate heat exchange group (3) is provided with a drying chamber (4), the right side of the waste heat recovery pipe (1) is provided with a spiral heat exchange group (5) at one end away from the plate heat exchange group (3), and the right side of the spiral heat exchange group (5) is provided with a dehydration chamber (6); The plate heat exchange group (3) comprises a plate heat exchanger (301), a first waste heat shunt pipe (302), and a first waste heat transfer pipe (303); the first waste heat shunt pipe (302) is provided at the top left side of the plate heat exchanger (301), and the first waste heat transfer pipe (303) is provided at the bottom right side of the plate heat exchanger (301); The spiral heat exchange group (5) comprises a spiral fin heat exchanger (501), a second waste heat shunt pipe (502), a spiral fin heat exchange tube (503), a bend pipe (504), and a second waste heat transfer pipe (505); the second waste heat shunt pipe (502) is provided on the left side of the spiral fin heat exchanger (501); the spiral fin heat exchange tube (503) is provided on the inner side of the spiral fin heat exchanger (501); and the bend pipes (504) are provided on both sides of the spiral fin heat exchanger (501). 04), a second waste heat transfer pipe (505) is provided at the right bottom end of the spiral fin heat exchanger (501), one end of the bend pipe (504) extends to the inside of the spiral fin heat exchanger (501) and is connected to the spiral fin heat exchange pipe (503), and the two groups of bend pipes (504) are installed in a staggered manner, the outer side of the spiral fin heat exchange pipe (503) adopts an asymmetric fin tube design, and the spacing of the flying fin heat exchange pipes on the outer side of the spiral fin heat exchange pipe (503) gradually decreases from left to right.

2. The waste heat recovery device for a boiler exhaust pipe according to claim 1, characterized in that: A driving motor (103) is provided at the bottom of the waste heat recovery pipe (1), the output end of the driving motor (103) extends into the interior of the waste heat recovery pipe (1) and is connected to the waste heat baffle plate (2), and a low-temperature recovery pipe (104) is provided at the top right side of the waste heat recovery pipe (1), the low-temperature recovery pipe (104) comprising a control valve and a recovery pipe.

3. The waste heat recovery device for a boiler exhaust pipe according to claim 1, characterized in that: Both ends of the waste heat barrier plate (2) are fitted to the inner side of the waste heat recovery pipe (1), and a rubber pad is provided at one end of the waste heat barrier plate (2).

4. The waste heat recovery device for a boiler exhaust pipe according to claim 1, characterized in that: The left end of the first waste heat diversion pipe (302) is fixedly connected to the waste heat recovery pipe (1), and the right end of the first waste heat transfer pipe (303) is fixedly connected to the left bottom of the drying chamber (4).

5. The waste heat recovery device for a boiler exhaust pipe according to claim 1, characterized in that: The drying chamber (4) and the dehydration chamber (6) have the same internal structure.

6. The waste heat recovery device for a boiler exhaust pipe according to claim 1, characterized in that: The output end of the second waste heat diversion pipe (502) extends to the interior of the spiral fin heat exchanger (501) and is connected to the spiral fin heat exchange pipe (503).

7. The waste heat recovery device for a boiler exhaust pipe according to claim 1, characterized in that: A liquid crystal control screen (601) is provided on the left side of the dehydration chamber (6); a low-level placement board (602) is provided at the bottom of the dehydration chamber (6); a middle-level placement board (603) is provided at the top of the dehydration chamber (6) away from the low-level placement board (602); and a high-level placement board (604) is provided at the top of the dehydration chamber (6) away from the middle-level placement board (603).

8. The waste heat recovery device for a boiler exhaust pipe according to claim 7, characterized in that: The tops of the lower placement plate (602), the middle placement plate (603), and the upper placement plate (604) are provided with a plurality of groups of through holes at equal intervals, and the diameters of the through holes gradually increase from bottom to top.

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