A boiler flue gas heat recovery device

Abstract

The application relates to the field of waste heat recovery production, and discloses a waste heat recovery device for a flue gas pipeline of a boiler, which comprises 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. Two groups of temperature sensing arrays are arranged at the left ends inside the waste heat recovery pipe. The inside of the waste heat recovery pipe is provided with a waste heat blocking plate. The right side of the waste heat recovery pipe is provided with the plate heat exchange group. The right side of the plate heat exchange group is provided with a drying chamber. The right side of the waste heat recovery pipe, away from the plate heat exchange group, is provided with the spiral heat exchange group. The device introduces a multistage recovery structure of the waste heat blocking plate, the plate heat exchange group and the spiral heat exchange group, realizes deep recovery and efficient utilization of the waste heat of the boiler, the waste heat blocking plate can intelligently adjust the heat energy flow path according to real-time temperature data, ensures that the high-temperature waste gas can be accurately distributed to different heat exchange components, and thus the waste heat in the waste gas is maximally extracted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of waste heat recovery, in particular to a boiler flue gas pipeline waste heat recovery device. BACKGROUND

[0002] The boiler waste heat recovery device refers to a device specially designed to capture and recycle the residual heat energy in the boiler flue gas. In the industrial production process, the boiler is a key link in energy conversion. The flue gas generated by combustion often carries a large amount of heat energy that has not been fully utilized. If this part of heat energy is directly discharged into the atmosphere, it not only leads to a huge waste of energy, but also aggravates the environmental heat load and promotes the greenhouse effect. Therefore, developing efficient and reliable boiler waste heat recovery devices is of great significance for improving energy utilization efficiency, reducing carbon emissions and promoting sustainable development. With the intensification of global energy crisis and the increasing strictness of 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 for boiler waste heat treatment, 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 heat energy in the flue gas. In addition, traditional waste heat recovery devices often have complex structure, high maintenance cost and poor adaptability, which limits their wide application in different working conditions. More importantly, these technologies often ignore the comprehensive utilization of other resources in the flue gas besides heat energy, leading to further waste of resources. In the long run, this not only aggravates the energy supply and demand contradiction, but also causes negative impact on the ecological environment that cannot be ignored. Therefore, exploring new and efficient boiler waste heat recovery technology to overcome the limitations of traditional technology has become the key to promoting green industrial development and achieving energy saving and emission reduction goals. For this reason, the present application provides a boiler flue gas pipeline waste heat recovery device. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a boiler flue gas pipeline waste heat recovery device to solve the above problems.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a boiler flue gas pipeline waste heat recovery device, comprising a waste heat recovery pipe, a plate heat exchanger group and a spiral heat exchanger group, the left end of the waste heat recovery pipe is provided with a transmission connecting pipe, the left side of the inside of the waste heat recovery pipe is provided with two groups of temperature sensing arrays, the inside of the waste heat recovery pipe is provided with a waste heat barrier plate, the right side of the waste heat recovery pipe is provided with a plate heat exchanger group, the right side of the plate heat exchanger group is provided with a drying chamber, the right side of the waste heat recovery pipe away from the plate heat exchanger group is provided with a spiral heat exchanger group, and the right side of the spiral heat exchanger group is provided with a dehydration chamber.

[0006] The plate heat exchanger group comprises a plate heat exchanger, a first waste heat diversion pipe and a first waste heat transmission pipe, the left top end of the plate heat exchanger is provided with the first waste heat diversion pipe, and the right bottom of the plate heat exchanger is provided with the first waste heat transmission pipe.

[0007] The spiral heat exchange group comprises a spiral fin heat exchanger, a second waste heat diversion pipe, a spiral fin heat exchanger pipe, a bend flow pipe and a second waste heat transmission pipe, the left side of the spiral fin heat exchanger is provided with the second waste heat diversion pipe, the inner side of the spiral fin heat exchanger is provided with the spiral fin heat exchanger pipe, the two sides of the spiral fin heat exchanger are respectively provided with the bend flow pipe, the right bottom end of the spiral fin heat exchanger is provided with the second waste heat transmission pipe, one end of the bend flow pipe extends to the inside of the spiral fin heat exchanger and is connected with the spiral fin heat exchanger pipe, and the two groups of bend flow pipes are installed in a staggered manner, the outer side of the spiral fin heat exchanger pipe is designed as an asymmetric fin pipe, and the distance between the flying heap layer fin heat exchanger pipes on the outer side of the spiral fin heat exchanger pipe gradually decreases from left to right.

[0008] Preferably, the bottom of the waste heat recovery pipe is provided with a driving motor, the output end of the driving motor extends to the inside of the waste heat recovery pipe and is connected with the waste heat blocking plate, the right top of the waste heat recovery pipe is provided with a low-temperature recovery pipe, and the low-temperature recovery pipe comprises a control valve and a recovery pipe.

[0009] Preferably, the two ends of the waste heat blocking plate are attached to the inner side of the waste heat recovery pipe, and one end of the waste heat blocking plate is provided with a rubber pad.

[0010] Preferably, the left end of the first waste heat diversion pipe is fixedly connected with the waste heat recovery pipe, and the right end of the first waste heat transmission pipe is fixedly connected with the left bottom of the drying chamber.

[0011] Preferably, the drying chamber and the dehydration chamber have the same internal structure.

[0012] Preferably, the output end of the second waste heat diversion pipe extends to the inside of the spiral fin heat exchanger and is connected with the spiral fin heat exchanger pipe.

[0013] Preferably, one end of the right side of the top ink roller is connected with the input end of the belt pulley, and one end of the right side of the bottom ink roller is connected with the output end of the belt pulley.

[0014] Preferably, the left side of the dehydration chamber is provided with a liquid crystal control screen, the bottom of the inside of the dehydration chamber is provided with a low-layer placing plate, the top of the inside of the dehydration chamber away from the low-layer placing plate is provided with a middle-layer placing plate, and the top of the inside of the dehydration chamber away from the middle-layer placing plate is provided with a high-layer placing plate.

[0015] Preferably, a plurality of groups of through holes are equidistantly arranged on the top of the low-layer placing plate, the middle-layer placing plate and the high-layer placing plate, and the diameters of the through holes gradually increase from bottom to top.

[0016] Compared with the prior art, the exhaust flue waste heat recovery device of the boiler has the following beneficial effects:

[0017] The device realizes deep recovery and efficient utilization of boiler waste heat through the introduction of multi-stage recovery structures such as waste heat blocking plates, plate heat exchanger groups and spiral heat exchanger groups. The waste heat blocking plates can intelligently adjust the heat flow path according to real-time temperature data, ensuring that high-temperature exhaust gas can be accurately distributed to different heat exchanger components, thereby maximizing the extraction of waste heat from the exhaust gas. The plate heat exchanger group and the spiral heat exchanger group further improve the heat exchange efficiency through their unique heat exchange structures. The above multi-stage recovery and utilization system not only significantly improves energy utilization efficiency, but also effectively reduces energy waste, bringing significant economic benefits to enterprises.

[0018] The device also optimizes the heat flow path and heat exchange efficiency. The introduction of components such as waste heat blocking plates, curved flow pipes and asymmetric finned pipes enables heat to be more fully transferred to the working medium, thereby improving heat recovery efficiency. At the same time, the clever design of the above components also makes the heat flow path more tortuous and winding, increasing the contact time and area of exhaust gas with heat exchanger pipes, further improving heat exchange efficiency.

[0019] The device also reduces production costs through multi-stage utilization of waste heat. In the drying chamber and the dehydration chamber, lower and higher temperature waste heat is used to dry and dehydrate materials respectively, maximizing the utilization of waste heat. The above multi-stage utilization method not only improves energy utilization efficiency, but also reduces additional energy consumption and production costs. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0021] Figure 2 is a schematic diagram of the three-dimensional cross-sectional structure of the waste heat recovery pipe of the present application;

[0022] Figure 3 is a schematic diagram of the three-dimensional structure of the waste heat recovery pipe of the present application;

[0023] Figure 4 is a schematic diagram of the three-dimensional structure of the plate heat exchanger group of the present application;

[0024] Figure 5 is a schematic diagram of the three-dimensional structure of the spiral heat exchanger group of the present application;

[0025] Figure 6 is a schematic diagram of the structure at A in the present application; Figure 5

[0026] Figure 7 is a schematic diagram of the three-dimensional structure of the dehydration chamber of the present application; ​

[0027] Figure 8 For the present invention Figure 7 The structural schematic diagram of B in the present invention.

[0028] In the figure: 1, waste heat recovery pipe; 101, transmission connecting pipe; 102, temperature sensing array; 103, driving motor; 104, low temperature recovery pipe; 2, waste heat blocking plate; 3, plate heat exchanger group; 301, plate heat exchanger; 302, first waste heat shunt pipe; 303, first waste heat transmission pipe; 4, drying chamber; 5, spiral heat exchanger group; 501, spiral fin heat exchanger; 502, second waste heat shunt pipe; 503, spiral fin heat exchanger pipe; 504, curved flow pipe; 505, second waste heat transmission pipe; 6, dehydration chamber; 601, liquid crystal control screen; 602, low layer placing plate; 603, middle layer placing plate; 604, high layer placing plate. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0030] Please refer to Figures 1-8 A waste heat recovery device of a boiler exhaust pipe, comprising a waste heat recovery pipe 1, a plate heat exchanger group 3 and a spiral heat exchanger group 5, the left end of the waste heat recovery pipe 1 is provided with a transmission connecting pipe 101, the left side of the inside of the waste heat recovery pipe 1 is provided with two groups of temperature sensing arrays 102, the inside of the waste heat recovery pipe 1 is provided with a waste heat blocking plate 2, the right side of the waste heat recovery pipe 1 is provided with the plate heat exchanger group 3, the right side of the plate heat exchanger group 3 is provided with a drying chamber 4, the right side of the waste heat recovery pipe 1 away from the plate heat exchanger group 3 is provided with the spiral heat exchanger group 5, and the right side of the spiral heat exchanger group 5 is provided with a dehydration chamber 6.

[0031] The plate heat exchanger group 3 comprises a plate heat exchanger 301, a first waste heat shunt pipe 302 and a first waste heat transmission pipe 303, the left side top end of the plate heat exchanger 301 is provided with the first waste heat shunt pipe 302, and the right side bottom of the plate heat exchanger 301 is provided with the first waste heat transmission pipe 303.

[0032] 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 pipe 503, a curved flow pipe 504, and a second waste heat transmission pipe 505. The left side of the spiral fin heat exchanger 501 is provided with the second waste heat shunt pipe 502. The inner side of the spiral fin heat exchanger 501 is provided with the spiral fin heat exchange pipe 503. The two sides of the spiral fin heat exchanger 501 are respectively provided with the curved flow pipe 504. The right side bottom end of the spiral fin heat exchanger 501 is provided with the second waste heat transmission pipe 505. One end of the curved flow pipe 504 extends to the inside of the spiral fin heat exchanger 501 and is connected with the spiral fin heat exchange pipe 503. The two groups of curved flow pipes 504 are in staggered installation. The outer side of the spiral fin heat exchange pipe 503 adopts an asymmetric finned tube design. The spacing of the finned heat exchange pipes on the outer side of the spiral fin heat exchange pipe 503 gradually decreases from left to right. The outer side of the spiral fin heat exchange pipe adopts an asymmetric finned tube design, and the spacing of the outer side fins gradually decreases from left to right, further improving the heat exchange efficiency. The asymmetric finned tube design increases the heat exchange area, and the gradual decrease in the spacing of the fins forms a gradient heat exchange effect, so that the heat energy can be more fully transferred to the working medium, improving the heat energy recovery rate.

[0033] The bottom of the waste heat recovery pipe 1 is provided with a driving motor 103. The output end of the driving motor 103 extends to the inside of the waste heat recovery pipe 1 and is connected with the waste heat blocking plate 2. The right side top of the waste heat recovery pipe 1 is provided with a low-temperature recovery pipe 104. The low-temperature recovery pipe 104 comprises a control valve and a recovery pipe. The introduction of the driving motor 103 realizes the dynamic adjustment of the waste heat blocking plate 2, which can intelligently adjust the heat energy flow path according to real-time temperature data, optimizing the heat exchange efficiency. Secondly, the setting of the low-temperature recovery pipe 104 enables the secondary recovery of waste heat gas with lower temperature but still having utilization value during the heat energy recovery process, further improving the energy utilization rate and reducing energy waste.

[0034] The two ends of the waste heat blocking plate 2 are attached to the inner side of the waste heat recovery pipe 1. One end of the waste heat blocking plate 2 is provided with a rubber pad. The design of the rubber pad at one end of the waste heat blocking plate 2 ensures the sealing performance of the waste heat blocking plate 3 during movement, prevents heat energy leakage, and improves the 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 blocking plate 2, reducing maintenance costs.

[0035] The left end of the first waste heat shunt pipe 302 is fixedly connected with the waste heat recovery pipe 1, the right end of the first waste heat transmission pipe 303 is fixedly connected with the left bottom of the drying chamber 4, the left end of the first waste heat shunt pipe is fixedly connected with the waste heat recovery pipe, and the right end of the first waste heat transmission pipe is fixedly connected with the left bottom of the drying chamber, which realizes effective transmission and utilization of heat energy. This fixed connection mode ensures the stability and reliability of heat energy transmission, avoids heat energy loss caused by loose or leakage connection, and directly inputs heat energy into the bottom of the drying chamber, which is beneficial to uniform distribution of heat energy and improves the drying efficiency.

[0036] The drying chamber 4 and the dehydration chamber 6 have the same internal structure, which simplifies the equipment structure, reduces the manufacturing cost, and is convenient for equipment maintenance and upgrading. At the same time, due to the similarity of the internal structure of the drying chamber and the dehydration chamber, the operator can more easily master the equipment operation and maintenance skills, and improve the work efficiency.

[0037] The output end of the second waste heat shunt pipe 502 extends into the spiral fin heat exchanger 501 and is connected with the spiral fin heat exchange pipe 503, the output end of the second waste heat shunt pipe extends into the spiral fin heat exchanger and is connected with the spiral fin heat exchange pipe, one end of the bend flow pipe also extends into the spiral fin heat exchanger and is connected with the spiral fin heat exchange pipe, and the two groups of bend flow pipes are designed to be installed in a staggered manner, which optimizes the heat flow path, improves the heat exchange efficiency, and the staggered installation of the bend flow pipe helps to reduce the flow resistance, promotes uniform distribution of heat energy, and enhances the heat exchange effect.

[0038] The left side of the dehydration chamber 6 is provided with a liquid crystal control screen 601, the bottom of the inside of the dehydration chamber 6 is provided with a low-layer placing plate 602, the top of the inside of the dehydration chamber 6 away from the low-layer placing plate 602 is provided with a middle-layer placing plate 603, and the top of the inside of the dehydration chamber 6 away from the middle-layer placing plate 603 is provided with a high-layer placing plate 604. The design of the left side of the dehydration chamber provided with a liquid crystal control screen and the inside provided with low-layer, middle-layer and high-layer placing plates realizes 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 real-time understand the equipment running state and make adjustment. At the same time, the design of the layered placing plates makes the materials uniformly dehydrated under different humidity conditions, improves the dehydration efficiency and material quality.

[0039] The low layer placing plate 602, the middle layer placing plate 603 and the high layer placing plate 604 are provided with multiple groups of through holes at the top in equal intervals, and the diameters of the through holes gradually increase from bottom to top. The low layer placing plate, the middle layer placing plate and the high layer placing plate are provided with multiple groups of through holes at the top in equal intervals, and the diameters of the through holes gradually increase from bottom to top. The design further optimizes the dehydration effect. The design makes the material better ventilate and radiate heat during the dehydration process, and avoids material damage caused by local overheating. At the same time, the gradual increase of the diameter of the through hole helps to provide appropriate ventilation conditions at different dehydration stages, improves the dehydration efficiency and the quality of the material.

[0040] Working principle: at the left end of the waste heat recovery pipe 1, the transmission connecting pipe 101 is closely connected, the high temperature waste gas generated by the operation of the boiler flows into the waste heat recovery pipe 1 along the transmission connecting pipe 101, the two groups of temperature sensing arrays 102 are distributed in the left side of the waste heat recovery pipe 1, through the linkage of temperature sensing array 102 and waste heat recovery pipe 1, the temperature of the waste gas entering the waste heat recovery pipe 1 can be monitored in real time and accurately, when the temperature sensing array 102 detects that the temperature of the waste gas is too high, the control system will make specific response as follows: through the linkage of driving motor 103 and waste heat blocking plate 2, the driving motor 103 receives the instruction quickly, the output end drives the waste heat blocking plate 2 to rotate and adjust in the waste heat recovery pipe 1, the waste heat blocking plate 2 is closely combined with the inside of the waste heat recovery pipe 1 at both ends, and the rubber pad at one end, so that the waste gas with too high temperature is transmitted to the spiral heat exchange group 5, the waste heat is transmitted to the dehydration chamber 6 inside through the spiral heat exchange group 5, and the material is dehydrated by using the waste gas with too high temperature, so that the waste heat is used to the greatest extent, on the contrary, when the temperature of the waste gas is too low, the control system controls the driving motor 103 to drive the waste heat blocking plate 2 to rotate to the left side and closely combine with one side of the waste heat recovery pipe 1, so that the waste gas quickly enters the plate heat exchanger 3, and the waste heat with lower temperature is transmitted to the drying chamber 4 through the plate heat exchanger 2, so that the material in the drying chamber 4 is dried by using the waste heat with lower temperature, the plate heat exchanger 3 is arranged in order at the right side of the waste heat recovery pipe 1, the plate heat exchanger 3 includes plate heat exchanger 301, first waste heat shunt pipe 302 and first waste heat transmission pipe 303, the left end of the first waste heat shunt pipe 302 is firmly connected with the waste heat recovery pipe 1, through the linkage of the waste heat recovery pipe 1 and the first waste heat shunt pipe 302, part of the high temperature waste gas in the waste heat recovery pipe 1 is accurately shunted to the first waste heat shunt pipe 302, and then smoothly enters the plate heat exchanger 301, heat is continuously transferred from the high temperature waste gas to the low temperature medium, the temperature of the waste gas after heat exchange is significantly reduced, and then is output through the first waste heat transmission pipe 303, the right end of the first waste heat transmission pipe 303 is stably connected with the left side bottom of the drying chamber 4, the waste gas after temperature reduction enters the drying chamber 4, and the drying operation is started, this linkage successfully realizes that part of the heat of the waste gas in the waste heat recovery pipe 1 is transferred to the low temperature medium, and the waste gas after temperature reduction is ingeniously used for drying, the value of waste heat is fully tapped, the comprehensive utilization rate of energy is greatly improved, then, there is a close linkage relationship between the plate heat exchanger 3 and the drying chamber 4, as known from the foregoing, the waste gas after heat exchange of the plate heat exchanger 3 enters the drying chamber 4 through the first waste heat transmission pipe 303, the drying chamber 4 has scientific and reasonable space structure according to the drying demand of the material, and fully contacts with the material placed therein, so as to take away the moisture in the material one by one and realize the drying treatment of the material, this linkage realizes the efficient utilization of waste heat in the drying link, so that the waste heat is used twice, the consumption of additional energy is avoided, and the production cost is reduced, secondly, the internal structure of the drying chamber 4 is same with that of the dehydration chamber 6,This provides a very similar hardware basis for the subsequent dehydration chamber 6 to utilize waste heat, the right side of the waste heat recovery pipe 1, away from the one end of the plate heat exchanger group 3, the spiral heat exchanger group 5 is waiting, the spiral heat exchanger group 5 covers the spiral fin heat exchanger 501, the second waste heat shunt pipe 502, the spiral fin heat exchanger pipe 503, the curved flow pipe 504, the second waste heat transmission pipe 505, the left end of the second waste heat shunt pipe 502 is connected with the waste heat recovery pipe 1, through the linkage of the waste heat recovery pipe 1 and the second waste heat shunt pipe 502, another part of the high-temperature exhaust gas in the waste heat recovery pipe 1 is shunted to the second waste heat shunt pipe 502, 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 exchanger pipe 503 carry out more intense heat exchange, the output end of the second waste heat shunt pipe 502 extends to the inside of the spiral fin heat exchanger 501, and the spiral fin heat exchanger pipe 503 is seamlessly connected, one end of the curved flow pipe 504 also extends to the inside of the spiral fin heat exchanger 501 and is connected with the spiral fin heat exchanger pipe 503, and the two groups of curved flow pipes 504 are arranged in a staggered manner, this unique structure design makes the flow path of the exhaust gas in the spiral fin heat exchanger 501 become tortuous, like in a maze, greatly increasing the contact time and area of the exhaust gas and the spiral fin heat exchanger pipe 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 depth recovery and utilization of the exhaust gas heat in the waste heat recovery pipe 1, and the waste heat in the exhaust gas is transmitted to the low-temperature medium as much as possible, finally, the spiral heat exchanger group 5 and the dehydration chamber 6 also form an efficient linkage, the exhaust gas after heat exchange of the spiral heat exchanger group 5 is output through the second waste heat transmission pipe 505, smoothly enters the dehydration chamber 6, the dehydration chamber 6 is internally provided with a low-layer placing plate 602, a middle-layer placing plate 603 and a high-layer placing plate 604, a plurality of groups of through holes are equidistantly distributed on the top of these placing plates, and the through holes are designed in a gradually increasing diameter 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 fully contacts with the materials placed on the placing plates in all directions and multiple levels, completely removes the water in the materials, realizes dehydration of the materials, at the same time, the liquid crystal control screen 601 arranged on the left side of the dehydration chamber 6 can realize real-time monitoring and accurate control of the dehydration process, ensures that the dehydration effect always remains stable, this linkage realizes efficient utilization of the waste heat in the dehydration link, adds strong practicality and functionality to the whole waste heat recovery device, the whole boiler waste heat recovery device constructs a complete multi-stage recovery and utilization system of the boiler waste heat through the close linkage between the waste heat recovery pipe 1, the temperature sensing array 102, the driving motor 103, the waste heat blocking plate 2, the plate heat exchanger group 3, the drying chamber 4, the spiral heat exchanger group 5, the dehydration chamber 6 and other components, this not only greatly improves the energy utilization rate, effectively reduces the energy waste, but also effectively reduces the production cost, brings significant economic benefits to the enterprise, at the same time, contributes to environmental protection,In line with the era demand of green development, through accurate temperature monitoring and the coordination of various components, it can ensure that the waste heat can be fully utilized in each link, maximize the waste heat recovery efficiency, and provide solid technical support for the sustainable development of industrial production.

[0041] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences of the principles and specific embodiments of the application and that numerous modifications, changes, substitutions, and alterations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A flue gas heat recovery device for a boiler, comprising a heat recovery tube (1), a plate heat exchanger group (3) and a spiral heat exchanger group (5), characterized in that: The left end of the waste heat recovery pipe (1) is provided with a transmission connecting pipe (101), the left two ends inside the waste heat recovery pipe (1) are provided with two groups of temperature sensing arrays (102), the inside of the waste heat recovery pipe (1) is provided with a waste heat blocking plate (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 end of the waste heat recovery pipe (1) away from the plate heat exchange group (3) is provided with a spiral heat exchange group (5), 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 transmission pipe (303), the left top end of the plate heat exchanger (301) is provided with the first waste heat shunt pipe (302), and the right bottom of the plate heat exchanger (301) is provided with the first waste heat transmission pipe (303). 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 pipe (503), a bend flow pipe (504) and a second waste heat transmission pipe (505), the left side of the spiral fin heat exchanger (501) is provided with the second waste heat shunt pipe (502), the inside of the spiral fin heat exchanger (501) is provided with the spiral fin heat exchange pipe (503), the two sides of the spiral fin heat exchanger (501) are respectively provided with the bend flow pipe (504), the right bottom end of the spiral fin heat exchanger (501) is provided with the second waste heat transmission pipe (505), one end of the bend flow pipe (504) extends into the spiral fin heat exchange pipe (503) and is connected with the spiral fin heat exchange pipe (503), and the two groups of bend flow pipes (504) are arranged in a staggered mode, the spiral fin heat exchange pipe (503) is designed in an asymmetric fin pipe mode, and the fins on the outer side of the spiral fin heat exchange pipe (503) gradually decrease from left to right.

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

3. A flue gas heat recovery device for a boiler according to claim 1, characterized in that: The two ends of the waste heat blocking plate (2) are attached to the inside of the waste heat recovery pipe (1), and one end of the waste heat blocking plate (2) is provided with a rubber pad.

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

5. A flue gas heat recovery device for a boiler according to claim 1, characterized in that: The inside structures of the drying chamber (4) and the dehydration chamber (6) are same.

6. A flue gas heat recovery device for a boiler according to claim 1, characterized in that: The output end of the second waste heat shunt pipe (502) extends into the spiral fin heat exchange pipe (503) and is connected with the spiral fin heat exchange pipe (503).

7. A flue gas heat recovery device for a boiler according to claim 1, characterized in that: The dehydration chamber (6) is provided with a liquid crystal control screen (601) on the left side, the bottom of the inside of the dehydration chamber (6) is provided with a low layer placing plate (602), the top of the inside of the dehydration chamber (6) away from the low layer placing plate (602) is provided with a middle layer placing plate (603), and the top of the inside of the dehydration chamber (6) away from the middle layer placing plate (603) is provided with a high layer placing plate (604).

8. A flue gas heat recovery device for a boiler according to claim 7, characterized in that: Multiple groups of through holes are equidistantly arranged on the top of the low layer placing plate (602), the middle layer placing plate (603) and the high layer placing plate (604), and the diameters of the through holes gradually increase from bottom to top.

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