Boiler flue gas waste heat recovery system based on immersed heat exchanger

Abstract

The utility model discloses a boiler flue gas waste heat recovery system based on an immersed heat exchanger, which belongs to the technical field of waste heat recovery and comprises a boiler body, a smoke exhaust pipe, an immersed heat exchanger body, a shell and tube heat exchanger, a dust fall component, an air blower, a purification component, a water return pump and a water return pipe. The boiler body, the smoke exhaust pipe, the immersed heat exchanger body, the shell and tube heat exchanger, the air blower, the water return pump and the water return pipe are used in cooperation, the smoke exhaust pipe can be directly arranged in the immersed heat exchanger, heat of smoke in a pipeline of the immersed heat exchanger is transmitted to water through the pipe wall and fins on the pipeline, the smoke waste heat recovery efficiency is improved, and energy is saved. The flue gas with the reduced temperature enters the shell and tube heat exchanger to transfer heat to air, the temperature of the air entering the boiler body is increased, the flue gas waste heat recovery efficiency can be improved to a greater extent through the flue gas waste heat recovery mode, and fuel consumption of the boiler body is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat recovery technical field, concretely is a kind of boiler flue gas waste heat recovery system based on immersion heat exchanger. BACKGROUND

[0002] With the continuous development of global economy, the total energy consumption is increasing year by year, and the energy consumption expenditure of enterprises is rising, so reducing energy consumption cost becomes the focus of enterprises. Enterprises can reduce the consumption of gas by recovering the waste heat of gas boiler flue gas, thereby reducing energy procurement costs. For enterprises, this can significantly reduce production costs and improve the competitiveness of enterprises.

[0003] Gas boiler will emit a large amount of high-temperature flue gas during combustion, and these flue gases contain considerable heat energy, as well as a certain amount of nitrogen oxides, sulfur dioxide and other pollutants. By setting up a waste heat recovery device, the heat in the flue gas can be recovered and utilized, thereby improving the comprehensive utilization efficiency of energy. Generally, recovering the waste heat of gas boiler flue gas can increase the thermal efficiency of the boiler by 5% to 15% or even more. This means that the hot water or steam produced by the boiler can reduce energy consumption and reduce pollutant emissions to the environment while meeting production and living needs, so we need to propose a boiler flue gas waste heat recovery system based on immersion heat exchanger. SUMMARY

[0004] The utility model aims at providing a kind of boiler flue gas waste heat recovery system based on immersion heat exchanger, can fully recover the heat in the flue gas of boiler, reduce the energy consumption of boiler, reduce the discharge of pollutants in the flue gas of boiler, to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a kind of boiler flue gas waste heat recovery system based on immersion heat exchanger, including boiler body, the one end of the boiler body is communicated with the flue gas pipe, the boiler body is connected with the immersion heat exchanger body by the flue gas pipe, the one end of the flue gas pipe is communicated with the shell and tube heat exchanger through the immersion heat exchanger body, the air inlet of the shell and tube heat exchanger side is provided with the dust fall component for dust fall to air, the shell and tube heat exchanger is connected with the air blower by pipeline on the other side, the one end of the air blower is communicated with the air inlet of the boiler body by pipeline, the one end of the shell and tube heat exchanger is connected with the component for purifying flue gas by pipeline, the one end of the immersion heat exchanger body side is provided with backwater pump, the other end of the immersion heat exchanger body side is communicated with backwater pipe, and the immersion heat exchanger body is communicated with the boiler body by the backwater pipe.

[0006] Preferably, the dust falling assembly comprises a mounting frame fixedly mounted on one side of the shell-and-tube heat exchanger, an installation groove is formed in the inner wall of the mounting frame, and a dustproof plate is arranged in the installation groove.

[0007] Preferably, a blocking block is arranged above the dustproof plate and at the top of the mounting frame, a magnetic attraction mechanism is arranged between the two ends of the blocking block and the two sides of the upper end of the mounting frame, and the blocking block is fixed to the top of the mounting frame through the magnetic attraction mechanism.

[0008] Preferably, the magnetic attraction mechanism comprises two groups of first connecting seats fixedly mounted on the two ends of the blocking block and two groups of second connecting seats fixedly mounted on the two sides of the upper end of the mounting frame, a first magnet block is embedded in the bottom of the first connecting seat, a second magnet block is embedded in the top of the second connecting seat, and the top of the first magnet block and the bottom of the second magnet block are magnetically attracted to each other.

[0009] Preferably, the bottom of the first connecting seat and the top of the second connecting seat are respectively provided with a fixing groove matched with the first magnet block and the second magnet block, and the first magnet block and the second magnet block are respectively arranged in the corresponding fixing groove.

[0010] Preferably, the purification assembly comprises a purification box arranged at the corresponding position of one end of the shell-and-tube heat exchanger, two groups of activated carbon layers are arranged at the two ends in the purification box, and a filter plate is arranged between the two groups of activated carbon layers and in the purification box.

[0011] Preferably, one end of the purification box is communicated with an exhaust pipe, and an exhaust fan is arranged in the exhaust pipe.

[0012] Compared with the prior art, the present application has the following advantages:

[0013] The present application can directly place the exhaust pipe in the submerged heat exchanger, the flue gas in the pipe transfers heat to the water through the pipe wall and the ribs on the pipe, improves the flue gas waste heat recovery efficiency, the flue gas with reduced temperature enters the shell-and-tube heat exchanger to transfer heat to the air, improves the temperature of the air entering the boiler body, the flue gas waste heat recovery mode can greatly improve the flue gas heat recovery efficiency, saves the fuel consumption of the boiler body, and reduces the pollution of the flue gas of the boiler body to the atmospheric environment.

[0014] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood from the practice of the present application. The purpose and other advantages of the present application can be realized and obtained by the structure indicated in the specification and the drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0017] Figure 3 This is a top view of the structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the magnetic attraction mechanism of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the rib of this utility model.

[0020] In the diagram: 1. Boiler body; 2. Exhaust pipe; 3. Submerged heat exchanger body; 4. Shell and tube heat exchanger; 5. Blower; 6. Return water pump; 7. Return water pipe; 8. Mounting frame; 9. Mounting groove; 10. Dustproof plate; 11. Sealing block; 12. Magnetic attraction mechanism; 121. First connecting seat; 122. Second connecting seat; 123. First magnet block; 124. Second magnet block; 125. Fixing groove; 13. Purification box; 14. Activated carbon layer; 15. Filter plate; 16. Exhaust pipe; 17. Exhaust fan; 18. Fin. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-5 This utility model provides a boiler flue gas waste heat recovery system based on a submerged heat exchanger, including a boiler body 1, a flue pipe 2, a submerged heat exchanger body 3, a shell and tube heat exchanger 4, a dust suppression component, a blower 5, a purification component, a return water pump 6, and a return water pipe 7.

[0023] The end of the boiler body 1 is communicated with the smoke exhaust pipe 2, the boiler body 1 is connected with the submerged heat exchanger body 3 through the smoke exhaust pipe 2, one end of the smoke exhaust pipe 2 penetrates the submerged heat exchanger body 3 and is communicated with the shell-and-tube heat exchanger 4, the air inlet on one side of the shell-and-tube heat exchanger 4 is provided with a dust falling assembly for falling dust on the air, the other side of the shell-and-tube heat exchanger 4 is connected with the air blower 5 through the pipeline, one end of the air blower 5 is communicated with the air inlet of the boiler body 1 through the pipeline, one end of the shell-and-tube heat exchanger 4 is connected with an assembly for purifying the flue gas through the pipeline, one end of the submerged heat exchanger body 3 on one side is provided with the water return pump 6, the other end of the submerged heat exchanger body 3 on one side is communicated with the water return pipe 7, and the submerged heat exchanger body 3 is communicated with the boiler body 1 through the water return pipe 7.

[0024] The submerged heat exchanger body 3 is a closed water tank, the smoke exhaust pipe 2 is submerged in the water tank, the flue gas flows in the pipeline, the heat is transferred to the water outside the pipeline through the pipeline wall, the temperature of the water is increased after absorbing the heat of the flue gas, the temperature of the flue gas is reduced after heat exchange, and the flue gas is discharged from the submerged heat exchanger body 3, simultaneously, the heat exchange between the flue gas in the pipeline and the water in the water tank is enhanced by arranging two groups of fins 18 on the surface of the smoke exhaust pipe 2, and the material of the fin 18 can be selected from aluminum.

[0025] Through the cooperation of the boiler body 1, the smoke exhaust pipe 2, the submerged heat exchanger body 3, the shell-and-tube heat exchanger 4, the air blower 5, the water return pump 6 and the water return pipe 7, the flue gas generated by the boiler body 1 enters the inside of the submerged heat exchanger body 3 through the smoke exhaust pipe 2, the temperature of the flue gas flowing through the smoke exhaust pipe 2 is increased after absorbing the heat in the submerged heat exchanger body 3, the water with the increased temperature is then introduced into the inside of the boiler body 1 from the inside of the submerged heat exchanger body 3 through the water return pipe 7 by the water return pump 6, the smoke in the smoke exhaust pipe 2 enters the inside of the shell-and-tube heat exchanger 4, the waste heat of the flue gas is absorbed by the outside air entering the inside of the shell-and-tube heat exchanger 4, the air with the increased temperature enters the boiler body 1 after being pressurized by the air blower 5, simultaneously, the flue gas with the reduced temperature flows out of the shell-and-tube heat exchanger 4 and is discharged into the atmosphere, so that the smoke exhaust pipe 2 can be directly placed in the submerged heat exchanger, the heat of the flue gas in the pipeline is transferred to the water through the pipeline wall and the fins 18 on the pipeline, the flue gas with the reduced temperature enters the shell-and-tube heat exchanger 4 and transfers the heat to the air, the temperature of the air entering the boiler body 1 is increased, the flue gas waste heat recovery mode can greatly improve the flue gas heat recovery efficiency, save the fuel consumption of the boiler body 1, and reduce the pollution of the flue gas of the boiler body 1 to the atmosphere.

[0026] The dust falling assembly comprises a mounting frame 8, a mounting groove 9, a dustproof plate 10, a blocking block 11 and a magnetic attraction mechanism 12, the mounting frame 8 is fixedly installed on one side of the shell-and-tube heat exchanger 4, the inner wall of the mounting frame 8 is provided with the mounting groove 9, the dustproof plate 10 is arranged in the mounting groove 9 in a matched mode, the dustproof plate 10 is slidably connected to the inner wall of the mounting groove 9, the blocking block 11 is arranged above the dustproof plate 10 and at the top of the mounting frame 8, the magnetic attraction mechanism 12 is arranged between the two ends of the blocking block 11 and the two sides of the upper end of the mounting frame 8, and the blocking block 11 is fixed to the top of the mounting frame 8 through the magnetic attraction mechanism 12.

[0027] Through the cooperation of the mounting frame 8, the mounting groove 9, the dustproof plate 10, the blocking block 11 and the magnetic attraction mechanism 12, the air inlet of the shell-and-tube heat exchanger 4 can be dustproofed, so that dust and sundries are prevented from entering the pipeline and the air inlet of the shell-and-tube heat exchanger 4 is prevented from being affected.

[0028] The magnetic attraction mechanism 12 comprises a first connecting seat 121, a second connecting seat 122, a first magnet block 123, a second magnet block 124 and a fixing groove 125, two groups of the first connecting seat 121 are fixedly installed at the two ends of the blocking block 11, two groups of the second connecting seat 122 are fixedly installed at the two sides of the upper end of the mounting frame 8, the first magnet block 123 is embedded at the bottom of the first connecting seat 121, the second magnet block 124 is embedded at the top of the second connecting seat 122, the top of the first magnet block 123 and the bottom of the second magnet block 124 are magnetically attracted to each other, the bottom of the first connecting seat 121 and the top of the second connecting seat 122 are respectively provided with the fixing groove 125 matched with the first magnet block 123 and the second magnet block 124, and the first magnet block 123 and the second magnet block 124 are respectively installed in the corresponding fixing groove 125.

[0029] Through the cooperation of the first connecting seat 121, the second connecting seat 122, the first magnet block 123, the second magnet block 124 and the fixing groove 125, the blocking block 11 can be installed or dismounted, the dustproof plate 10 can be conveniently dismounted, the dustproof plate 10 can be conveniently cleaned or replaced, and the dustproof effect of the dustproof plate 10 is ensured.

[0030] The purification assembly comprises a purification box 13, an activated carbon layer 14, a filter plate 15, an exhaust pipe 16 and an exhaust fan 17, the purification box 13 is arranged at a corresponding position of one end of the shell-and-tube heat exchanger 4, two groups of the activated carbon layer 14 are arranged at the two ends in the purification box 13, the filter plate 15 is arranged between the two groups of the activated carbon layer 14 and in the purification box 13, the exhaust pipe 16 is communicated with one end of the purification box 13, and the exhaust fan 17 is installed in the exhaust pipe 16.

[0031] Specifically, by the cooperation of the purification box 13, the activated carbon layer 14, the filter plate 15, the exhaust pipe 16 and the exhaust fan 17, the flue gas discharged from the shell-and-tube heat exchanger 4 can be purified, the emission of pollutants is reduced, and the protection of the environment is improved.

[0032] Although the embodiments of the present application have been shown and described, it should be understood by those ordinary skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments 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 system based on a submerged heat exchanger, characterized in that: The system includes a boiler body (1), one end of which is connected to a flue pipe (2). The boiler body (1) is connected to a submerged heat exchanger body (3) via the flue pipe (2). One end of the flue pipe (2) passes through the submerged heat exchanger body (3) and is connected to a shell-and-tube heat exchanger (4). A dust suppression component for dust suppression of the air is provided at the air inlet on one side of the shell-and-tube heat exchanger (4). The other side of the shell-and-tube heat exchanger (4) is connected to a blower via a pipe. The blower (5) is connected to the air inlet of the boiler body (1) through a pipe at one end. The shell and tube heat exchanger (4) is connected to a component for purifying flue gas through a pipe at one end. A return water pump (6) is provided at one end of one side of the submerged heat exchanger body (3). A return water pipe (7) is connected at the other end of one side of the submerged heat exchanger body (3). The submerged heat exchanger body (3) is connected to the boiler body (1) through the return water pipe (7).

2. The boiler flue gas waste heat recovery system based on a submerged heat exchanger according to claim 1, characterized in that: The dust suppression assembly includes a mounting frame (8) fixedly installed on one side of the shell-and-tube heat exchanger (4). The inner wall of the mounting frame (8) is provided with a mounting groove (9). A dustproof plate (10) is adapted to be installed inside the mounting groove (9). The dustproof plate (10) is slidably connected to the inner wall of the mounting groove (9).

3. A boiler flue gas waste heat recovery system based on an immersion heat exchanger according to claim 2, characterized in that: A sealing block (11) is provided above the dustproof plate (10) and at the top of the mounting frame (8). A magnetic attraction mechanism (12) is provided between the two ends of the sealing block (11) and the two sides of the upper end of the mounting frame (8). The sealing block (11) is fixed to the top of the mounting frame (8) by the magnetic attraction mechanism (12).

4. A boiler flue gas waste heat recovery system based on a submerged heat exchanger according to claim 3, characterized in that: The magnetic attraction mechanism (12) includes two sets of first connecting seats (121) fixedly installed at both ends of the sealing block (11) and two sets of second connecting seats (122) fixedly installed on both sides of the upper end of the mounting frame (8). The bottom of the first connecting seat (121) is embedded with a first magnet block (123), and the top of the second connecting seat (122) is embedded with a second magnet block (124). The top of the first magnet block (123) and the bottom of the second magnet block (124) are magnetically attracted to each other.

5. A boiler flue gas waste heat recovery system based on a submerged heat exchanger according to claim 4, characterized in that: The bottom of the first connecting seat (121) and the top of the second connecting seat (122) are respectively provided with fixing grooves (125) that are adapted to the first magnet block (123) and the second magnet block (124). The first magnet block (123) and the second magnet block (124) are respectively installed in the corresponding fixing grooves (125).

6. A boiler flue gas waste heat recovery system based on a submerged heat exchanger according to claim 1, characterized in that: The purification assembly includes a purification box (13) located at one end of the shell-and-tube heat exchanger (4). Two sets of activated carbon layers (14) are provided at both ends inside the purification box (13). A filter plate (15) is provided between the two sets of activated carbon layers (14) and inside the purification box (13).

7. A boiler flue gas waste heat recovery system based on a submerged heat exchanger according to claim 6, characterized in that: One end of the purification box (13) is connected to an exhaust pipe (16), and an exhaust fan (17) is installed inside the exhaust pipe (16).

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