Boiler flue gas waste heat recovery device

Abstract

The utility model relates to the technical field of boiler flue gas treatment, and discloses a boiler flue gas waste heat recovery device which comprises a bottom plate, a boiler body and a waste heat recovery mechanism, and the waste heat recovery mechanism comprises a heat collection box fixedly connected to the outer portion of a smoke outlet in the tail of the boiler body. According to the boiler flue gas waste heat recovery device, the multiple parallel metal fins are ingeniously installed at the tail smoke outlet of the boiler body, an efficient heat collecting face is formed, then the outer surface of the front half part of the spiral heat exchange pipe is fixedly connected to the inner walls of the metal fins, and therefore the heat collecting face is formed. The metal fins play a crucial role in the device, the capture efficiency of heat in flue gas is remarkably improved by increasing the contact surface area of the flue gas and metal, the main function of the spiral heat exchange pipe is to efficiently transfer the captured heat to flowing fluid, and the heat exchange efficiency is improved. The design optimizes the heat exchange performance of the whole device.

Description

TECHNICAL FIELD

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

[0002] A boiler is an energy conversion device. The energy input into the boiler includes chemical energy in fuel, electric energy, and the boiler outputs steam, high-temperature water or organic heat carrier with certain heat energy. The hot water or steam generated in the boiler can directly provide the required heat energy for industrial production and people's life, or can be converted into mechanical energy through a steam power device, or the mechanical energy can be converted into electric energy through a generator. The flue gas generated during work has a high temperature. If it is directly discharged into the environment, it will cause waste. In order to ensure the sustainable utilization of resources, a boiler flue gas waste heat recovery device is arranged for recovery.

[0003] The prior art (publication number: CN221801758U) discloses a boiler flue gas waste heat recovery device, which belongs to the technical field of boiler flue gas treatment. The boiler flue gas waste heat recovery device comprises a boiler body and a smoke pipe. The smoke pipe is fixedly connected to the smoke outlet of the boiler body. A waste heat recovery mechanism is arranged between the boiler body and the smoke pipe. The waste heat recovery mechanism comprises an economizer, a first water inlet pipe and a second water inlet pipe. The economizer is fixedly connected to the outer wall of the smoke pipe. The first water inlet pipe is fixedly connected to the water inlet of the economizer. The second water inlet pipe is fixedly connected to the water outlet of the economizer. The other end of the second water inlet pipe is fixedly connected to the water inlet of the boiler body. By opening the first valve and the second valve and closing the third valve, cold water enters the economizer through the first water inlet pipe. The economizer utilizes the waste heat of the flue gas in the smoke pipe to heat the cold water entering through the first water inlet pipe. The heated water enters the boiler body through the second water inlet pipe, thereby avoiding waste.

[0004] The device in the above-mentioned comparative document can achieve the effect of waste heat recovery. However, the waste heat recovery is only realized by the economizer, and the recovery efficiency is low. In order to solve the above-mentioned problem, a boiler flue gas waste heat recovery device is proposed. Content of the utility model

[0005] In view of the deficiencies of the prior art, the present application provides a boiler flue gas waste heat recovery device, which can improve the waste heat recovery efficiency while ensuring the stability and safety of the system.

[0006] To achieve the above object, the present application provides the following technical scheme: a boiler flue gas waste heat recovery device, comprising a bottom plate, a boiler body and a waste heat recovery mechanism, the waste heat recovery mechanism comprises a heat collection box fixedly connected outside the tail exhaust port of the boiler body, the inner wall of the heat collection box is fixedly connected with parallel arranged metal fins, the surface of each metal fin is coated with a high-efficiency absorption coating, a spiral heat exchange pipe is installed in the inside of the heat collection box, the outer surface of the spiral heat exchange pipe is fixedly connected in the inner wall of the plurality of metal fins, an electric heating wire is installed in the inner wall of the heat collection box, the spiral heat exchange pipe is sleeved outside the electric heating wire, and an auxiliary mechanism is arranged below the waste heat recovery mechanism.

[0007] Through the above scheme, by installing a plurality of parallel metal fins at the tail exhaust port of the boiler body, efficient heat collection can be formed, the outer surface of the front half of the spiral heat exchange pipe is fixedly connected in the inner wall of the plurality of metal fins, the effect of efficient heat exchange can be achieved, the metal fins maximize the heat capture of the flue gas, and the spiral heat exchange pipe efficiently transfers the heat to the fluid, the combination of the two optimizes the overall heat exchange performance, a small amount of high-temperature flue gas is guided to the end of the heat collection box, the initial temperature of the fluid at the end of the spiral heat exchange pipe can be further improved by the cooperation of the start of the electric heating wire and the waste heat of the high-temperature flue gas, and the energy consumption of the electric heating wire can be reduced, which is more practical.

[0008] Further, the boiler body is fixedly connected to the upper surface of the bottom plate, and a valve is installed at the tail exhaust port of the boiler body.

[0009] Through the above scheme, by setting the valve, the flue gas flow can be automatically adjusted as required to ensure the heat exchange efficiency and system stability.

[0010] Further, a fan is installed at the output end of the heat collection box, and an exhaust pipe is installed at the output end of the fan.

[0011] Through the above scheme, by setting the fan and the exhaust pipe, the flow of air or flue gas can be controlled to ensure that the speed and flow of the airflow during the heat exchange process are always in the best state.

[0012] Further, two symmetrical temperature sensors are installed on the inner bottom wall of the heat collection box.

[0013] Through the above scheme, by setting the temperature sensor, the temperature data inside the heat collection box can be monitored in real time.

[0014] Further, the input end of the spiral heat exchange pipe is located on the front side of the heat collection box, and the output end of the spiral heat exchange pipe is located below the exhaust pipe.

[0015] Through the above scheme, by limiting the positions of the two ends of the spiral heat exchange pipe, the input and output of external fluid medium can be facilitated.

[0016] Further, the auxiliary mechanism comprises a support fixedly connected to the upper surface of the bottom plate, and the top end of the support is fixedly connected to the bottom surface of the heat collection box.

[0017] Through the above scheme, the support can support the heat collection box, so that the heat collection box can be more stably installed at the tail of the boiler body.

[0018] Further, the inner wall of the support is provided with a controller and a display, and the controller and the display are electrically connected.

[0019] Through the above scheme, the controller and the display can be conveniently controlled, and the operation is convenient.

[0020] Further, the bottom surface of the bottom plate is fixedly connected with a support column at each corner, and the bottom surface of each support column is fixedly connected with an anti-skid pad.

[0021] Through the above scheme, the support column can make the device more stably placed on the contact surface, and the stability of the device is optimized.

[0022] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0023] The boiler flue gas waste heat recovery device, which is designed ingeniously by installing multiple parallel metal fins at the tail exhaust port of the boiler body, forms an efficient heat collection surface. Then, the outer surface of the front half of the spiral heat exchange pipe is fixedly connected to the inner wall of the metal fins, thereby achieving efficient heat exchange effect. The metal fins play a crucial role in this device by increasing the surface area of the flue gas in contact with the metal, significantly improving the heat capture efficiency of the flue gas. The main function of the spiral heat exchange pipe is to efficiently transfer the captured heat to the flowing fluid. This design optimizes the heat exchange performance of the entire device. It is worth noting that part of the high-temperature components of the flue gas will be guided to the end of the heat collection box. At this time, by starting the electric heating wire, the initial temperature of the flowing medium at the end of the spiral heat exchange pipe can be further improved by using the waste heat of the high-temperature flue gas in cooperation with the electric heating. This design not only significantly improves the efficiency, but also significantly reduces energy consumption by fully utilizing the waste heat of the flue gas, making it more energy-saving, environmentally friendly and practical. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the structure of the present application;

[0025] Figure 2 It is a schematic diagram of the local structure of the structure of the present application;

[0026] Figure 3Fig. 1 is a schematic view of a first partial cross-sectional structure of the structure of the present application;

[0027] Figure 4 Fig. 2 is a schematic view of a second partial cross-sectional structure of the structure of the present application.

[0028] In the drawings:

[0029] 1, bottom plate; 2, boiler body; 3, waste heat recovery mechanism; 301, heat collection box; 302, metal fin; 303, spiral heat exchange pipe; 304, electric heating wire; 305, valve; 306, fan; 307, exhaust pipe; 308, temperature sensor; 4, auxiliary mechanism; 401, support; 402, controller; 403, display; 5, support column. DETAILED DESCRIPTION

[0030] 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 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 of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0031] Please refer to Figure 1 , Figure 3 and Figure 4The boiler flue gas waste heat recovery device in the embodiment comprises a bottom plate 1, a boiler body 2 and a waste heat recovery mechanism 3, the waste heat recovery mechanism 3 comprises a heat collecting box 301 fixedly connected outside a tail smoke outlet of the boiler body 2, the heat collecting box 301 is made of high-efficiency heat insulation material, can greatly improve the energy efficiency of the system, reduce the heat loss, ensure the efficiency of the heat exchange process, the boiler body 2 is fixedly connected to the upper surface of the bottom plate 1, a valve 305 is installed at the tail smoke outlet of the boiler body 2, the valve 305 can automatically adjust the flue gas flow according to the demand, ensure the heat exchange efficiency and the system stability, parallel metal fins 302 are fixedly connected to the inner wall of the heat collecting box 301, the surface of each metal fin 302 is coated with a high-efficiency absorption coating, can effectively increase the heat absorption, and the high-temperature flue gas discharged by the boiler body 2 can directly contact the metal fins 302, so that the metal fins 302 can quickly capture a large amount of heat, a spiral heat exchange pipe 303 is installed in the heat collecting box 301, the outer surface of the spiral heat exchange pipe 303 is fixedly connected to the inner wall of the metal fins 302, the spiral heat exchange pipe 303 is installed in the metal fins 302, can ensure sufficient contact and promote heat conduction, the spiral heat exchange pipe 303 can transport fluid medium inside, so as to facilitate the waste heat recovery work, an electric heating wire 304 is installed in the heat collecting box 301, the spiral heat exchange pipe 303 is sleeved outside the electric heating wire 304, when the electric heating wire 304 is started, the waste heat in the high-temperature flue gas can heat the tail end part of the spiral heat exchange pipe 303, which not only can reduce the energy consumption of the electric heating wire 304, but also can further heat the output fluid medium, and is more practical.

[0032] Please refer to Figure 2 , Figure 3 and Figure 4 , a fan 306 is installed at the output end of the heat collecting box 301, an exhaust pipe 307 is installed at the output end of the fan 306, the flow of air or flue gas can be controlled by setting the fan 306 and the exhaust pipe 307, so as to ensure that the speed and flow of the airflow in the heat exchange process are always in the best state, two symmetrical temperature sensors 308 are installed on the inner bottom wall of the heat collecting box 301, the temperature data in the heat collecting box 301 can be monitored in real time by setting the temperature sensors 308, the input end of the spiral heat exchange pipe 303 is located at the front side of the heat collecting box 301, and the output end of the spiral heat exchange pipe 303 is located below the exhaust pipe 307, the positions of the two ends of the spiral heat exchange pipe 303 are limited, so as to facilitate the input and output of external fluid medium.

[0033] Please refer to Figure 2 , Figure 3 and Figure 4The lower part of the waste heat recovery mechanism 3 is provided with an auxiliary mechanism 4, the auxiliary mechanism 4 comprises a support 401 fixedly connected to the upper surface of the bottom plate 1, the top end of the support 401 is fixedly connected with the bottom surface of the heat collecting box 301, by arranging the support 401, the heat collecting box 301 can be supported, so that the heat collecting box 301 can be more stably installed at the tail of the boiler body 2, the inner wall of the support 401 is provided with a controller 402 and a display 403, the controller 402 and the display 403 are electrically connected, the electric heating wire 304, the valve 305 and the fan 306 are electrically connected with the controller 402, by arranging the controller 402 and the display 403, the electrical elements in the waste heat recovery mechanism 3 can be controlled conveniently, and the operation is convenient, the bottom surface of the bottom plate 1 is fixedly connected with a support column 5 at four corners, the bottom surface of each support column 5 is fixedly connected with an anti-skid pad, by arranging the support column 5, the device can be placed more stably on the contact surface, and the stability of the device is optimized.

[0034] In the embodiment, the waste heat recovery device for boiler flue gas can form efficient heat collection by installing a plurality of parallel metal fins 302 at the exhaust port of the tail of the boiler body 2, the outer surface of the front half of the spiral heat exchange pipe 303 is fixedly connected to the inner wall of the plurality of metal fins 302, the metal fins 302 maximize the heat capture of the flue gas, and the spiral heat exchange pipe 303 efficiently transfers heat to the fluid, and the combination of the two optimizes the overall heat exchange performance, a small amount of high-temperature flue gas is guided to the end of the heat collecting box 301, the startup of the electric heating wire 304 and the waste heat of the high-temperature flue gas can further improve the initial temperature of the fluid, and the energy consumption of the electric heating wire 304 is reduced, thereby improving the overall energy efficiency, through the cooperation of the above functions, the energy utilization efficiency can be significantly improved, the fuel consumption is reduced, the enterprise operating cost is reduced, and the design concept of environmental protection and energy saving is adopted, which is helpful to improve the ecological environment quality and promote the implementation of the sustainable development strategy.

[0035] The working principle of the above embodiment is that the high-temperature flue gas generated by the boiler body 2 is input into the heat collection box 301, and then can directly capture heat through the plurality of metal fins 302, the plurality of metal fins 302 can capture a large amount of heat, which is transmitted to the introduced fresh air or water solution outside through the spiral heat exchange pipe 303 inside the heat collection box 301, and the outer surface of the front end of the spiral heat exchange pipe 303 is fixedly connected with the inner wall of the metal fin 302, so that the heat exchange effect can be directly realized. This design reduces the loss of heat in the transmission process, while saving equipment space, because the metal fin 302 is in contact with the spiral heat exchange pipe 303 for heat conduction, which is more rapid and efficient than the air convection method. At the same time, a small amount of high-temperature flue gas is guided to the tail end of the heat collection box 301, which can further heat the fresh air or water flow by starting the electric heating wire 304. The electric heating wire 304 cooperates with the waste heat of the high-temperature flue gas to ensure that the temperature of the fresh air or water flow is improved while the energy consumption of the electric heating wire 304 is reduced, thereby improving the overall energy efficiency. The controller 402 can master the temperature data of the heat collection box 301 in real time, and can timely adjust the working conditions of the valve 305, the electric heating wire 304 and the fan 306, so as to ensure that the energy conversion rate is always high during the entire operation cycle.

[0036] It should be noted that, in this document, the terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or equipment including the element.

[0037] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations of the embodiments can be made without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A boiler flue gas waste heat recovery device, comprising a bottom plate (1), a boiler body (2) and a waste heat recovery mechanism (3), characterized in that: The waste heat recovery mechanism (3) comprises a heat collecting box (301) fixedly connected outside the tail smoke outlet of the boiler body (2), the inner wall of the heat collecting box (301) is fixedly connected with parallel metal fins (302), the surface of each metal fin (302) is coated with a high-efficiency absorption coating, a spiral heat exchange pipe (303) is installed in the heat collecting box (301), the outer surface of the spiral heat exchange pipe (303) is fixedly connected to the inner wall of the metal fins (302), an electric heating wire (304) is installed on the inner wall of the heat collecting box (301), the spiral heat exchange pipe (303) is sleeved outside the electric heating wire (304), and an auxiliary mechanism (4) is arranged below the waste heat recovery mechanism (3).

2. A boiler flue gas waste heat recovery device according to claim 1, characterized in that: The boiler body (2) is fixedly connected to the upper surface of the bottom plate (1), and a valve (305) is installed at the tail smoke outlet of the boiler body (2).

3. A boiler flue gas waste heat recovery device according to claim 1, characterized in that: The output end of the heat collecting box (301) is provided with a fan (306), and the output end of the fan (306) is provided with an exhaust pipe (307).

4. A flue gas heat recovery device for a boiler according to claim 1, characterized in that: Two symmetrical temperature sensors (308) are installed on the inner bottom wall of the heat collecting box (301).

5. A flue gas heat recovery device for a boiler according to claim 3, characterized in that: The input end of the spiral heat exchange pipe (303) is located on the front side of the heat collecting box (301), and the output end of the spiral heat exchange pipe (303) is located below the exhaust pipe (307).

6. A flue gas heat recovery device for a boiler according to claim 1, characterized in that: The auxiliary mechanism (4) comprises a support (401) fixedly connected to the upper surface of the bottom plate (1), and the top end of the support (401) is fixedly connected with the bottom surface of the heat collecting box (301).

7. A flue gas heat recovery device for a boiler according to claim 6, characterized in that: A controller (402) and a display (403) are installed on the inner wall of the support (401) and are electrically connected.

8. A flue gas heat recovery device for a boiler according to claim 1, characterized in that: Four supporting columns (5) are fixedly connected to the bottom surface of the bottom plate (1), and an anti-skid pad is fixedly connected to the bottom surface of each supporting column (5).

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