Flue gas waste heat recovery device

Abstract

The utility model discloses a flue gas waste heat recovery device, and belongs to the technical field of waste heat recovery. The device mainly comprises a frame body; the filtering mechanism is positioned at a smoke inlet at the upper end of the frame body; the heat exchange mechanism is fixedly arranged at the upper end of the frame body, and a heat exchange pipe is arranged on the heat exchange mechanism; the cleaning assembly is arranged on the heat exchange pipe in a sleeving mode and comprises an air cylinder, a first air cylinder and a second air cylinder, and the air cylinder is fixedly arranged at the upper end of the heat exchange mechanism. The cleaning ring is arranged on the collecting mechanism on the heat exchange tube in a sleeving manner; the collecting mechanism is located at the lower end of the frame. According to the flue gas waste heat recovery device, by arranging the cleaning mechanism, after heat exchange is conducted between the heat exchange device and the flue gas, the temperature is reduced, and condensed water formed by condensing pollutants in part of the flue gas is carried for cleaning.

Description

Technical Field

[0001] This application relates to the technical field of waste heat recovery, specifically a flue gas waste heat recovery device. Background Art

[0002] The flue gas waste heat recovery device uses a new type of high-efficiency heat exchanger to cool or preheat the discharged flue gas, thereby improving energy utilization efficiency, reducing energy waste, and reducing air pollution. This device has the characteristics of compact structure, small floor area, safe and reliable operation, and simple operation, and is widely used in industrial production.

[0003] The function of the flue gas waste heat recovery device is to improve the thermal energy utilization efficiency, reduce energy waste, lower the exhaust temperature, and reduce air pollution. It is applicable to industries such as metallurgy, building materials, power stations, chemical engineering, and glass, and can effectively recover the waste heat in high-temperature flue gas, improve the thermal efficiency of equipment. In the metallurgy industry, the flue gas waste heat recovery device can be used to recover the waste heat of coking flue gas; in the building materials industry, it is used to recover the waste heat of ceramic and glass melting furnaces; in the power station industry, it is used to recover the waste heat of high-temperature flue gas and the sensible heat of coal-fired boiler exhaust gas, etc.

[0004] For example, the patent with publication number CN201764867U discloses a flue gas waste heat recovery device. In this patent, partitions are fixed at the flue gas inlet and outlet of the smoke collecting box, and multiple rows of heat dissipation tubes are fixed between the two partitions. Heat dissipation fins are fixed on the heat dissipation tubes to improve the heat exchange capacity between the heat dissipation tubes and the heated medium, thereby improving the waste heat recovery efficiency of the flue gas waste heat recovery device.

[0005] During the implementation of the above patent, due to continuous flue gas waste heat conversion, after heat exchange with the flue gas at the heat exchange device, the temperature decreases and part of the pollutants in the flue gas condense into condensate water. This condensate water will pollute the heat exchange pipeline, affecting the heat exchange capacity of the heat exchange pipeline and resulting in a reduction in waste heat recovery efficiency.

[0006] Therefore, it is necessary to provide a flue gas waste heat recovery device to solve the above problems.

[0007] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of this application, and therefore, it may include information that does not constitute prior art. Summary of the Invention

[0008] Based on the above problems existing in the prior art, the problem to be solved by this application is: to provide a flue gas waste heat recovery device to solve the problem that after heat exchange with the flue gas at the heat exchange device, the temperature decreases and part of the pollutants in the flue gas condense into condensate water, which will affect the heat exchange capacity of the heat exchange pipeline.

[0009] The technical solution adopted by this application to solve its technical problems is: a flue gas waste heat recovery device, including:

[0010] Frame body;

[0011] Filter mechanism, which is located at the smoke inlet at the upper end of the frame body, and is used for preliminarily filtering the flue gas recovered from waste heat;

[0012] Heat exchange mechanism, which is fixedly arranged at the upper end of the frame body, and is used for transferring the waste heat in the flue gas to the medium that needs to be heated. Heat exchange tubes are arranged on the heat exchange mechanism;

[0013] Cleaning assembly, which is sleeved on the heat exchange tube, and is used for cleaning the condensed water formed by pollutants on the heat exchange tube. The cleaning assembly includes:

[0014] Cylinder, which is fixedly arranged at the upper end of the heat exchange mechanism;

[0015] Cleaning ring, which is sleeved on the heat exchange tube;

[0016] Collection mechanism, which is located at the lower end of the frame body, and is used for collecting the condensed water on the heat exchange tube.

[0017] Furthermore, the filter mechanism includes a box body fixedly arranged at the upper end of the frame body. The interior of the box body is a cavity. A smoke inlet is fixedly arranged at the smoke inlet of the box body, and a connection port is arranged at a position of the box body far from the smoke inlet.

[0018] Furthermore, two groups of fixing blocks are fixedly arranged inside the box body. The fixing blocks are arranged along the flue gas flow direction. Filter components are fixedly arranged on the fixing blocks. The filter components include gratings fixedly arranged inside the box body. A fiber layer is fixedly arranged at a position inside the box body far from the smoke inlet along the flue gas flow direction.

[0019] Furthermore, a connection pipe is fixedly connected to one side of the connection port far from the filter mechanism.

[0020] Furthermore, the heat exchange mechanism includes a bottom plate fixedly arranged on the frame body. The bottom plate is in a hollow shape. Two groups of guard plates are fixedly arranged on both sides of the bottom plate. An upper guard plate is fixedly erected on the upper ends of the guard plates;

[0021] A heat exchange component is fixedly arranged between the bottom plate and the upper guard plate. The heat exchange component includes an inlet and an outlet for the medium to be heated fixedly arranged on the upper end of the upper guard plate. Multiple groups of conveying pipes are fixedly arranged at both ends of the heat exchange tube. The conveying pipes are fixedly connected to the inlet and the outlet for the medium to be heated. A smoke outlet is arranged on one side of the heat exchange mechanism along the flue gas flow direction.

[0022] Further, a connection block is fixedly connected to the output end of the cylinder, and a connecting rod is fixedly arranged between the cleaning rings.

[0023] The beneficial effect of this application is that the flue gas waste heat recovery device provided by this application achieves the cleaning of the condensate formed by the pollutants in the flue gas carried after the heat exchange device exchanges heat with the flue gas and the temperature decreases.

[0024] In addition to the purposes, features and advantages described above, this application has other purposes, features and advantages. The following will refer to the drawings to further elaborate on this application in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The schematic diagrams of the specification forming a part of this application are used to provide a further understanding of this application. The schematic embodiments and descriptions thereof are used to explain this application and do not constitute an improper limitation to this application.

[0026] In the drawings:

[0027] Figure 1 is the overall schematic diagram of the flue gas waste heat recovery device in this application;

[0028] Figure 2 is Figure 1 the schematic diagram of the filtering mechanism in

[0029] Figure 3 is Figure 2 the schematic diagram of the filtering component in

[0030] Figure 4 is Figure 1 the schematic diagram of the heat exchange mechanism in

[0031] Figure 5 is Figure 4 the schematic diagram of the heat exchange component in

[0032] Figure 6 is Figure 5 the schematic diagram of the cleaning component in

[0033] Among them, the reference numerals in the drawings are as follows:

[0034] 1, frame; 2, filtering mechanism; 3, heat exchange mechanism; 4, connecting pipe; 5, smoke inlet; 6, smoke outlet; 7, collection mechanism; 21, box body; 22, filtering component; 23, fixing block; 24, connection port; 221, grille; 223, fiber layer; 31, inlet of heated medium; 32, outlet of heated medium; 33, guard plate; 34, bottom plate; 35, heat exchange component; 351, heat exchange pipe; 36, cleaning component; 361, cylinder; 363, cleaning ring; 364, connecting rod; 362, connection block; 37, upper guard plate; 352, conveying pipe. Detailed implementation manners

[0035] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0036] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described 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 of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0037] As Figures 1-3 shown, the present application provides a flue gas waste heat recovery device, which includes a frame body 1 and a filtering mechanism 2 fixedly arranged at the flue gas inlet at the upper end of the frame body 1. The filtering mechanism 2 is used for preliminarily filtering the flue gas for waste heat recovery.

[0038] The filtering mechanism 2 includes a box body 21 fixedly arranged at the upper end of the frame body 1. The interior of the box body 21 is a cavity. A flue gas inlet 5 is fixedly arranged at the flue gas inlet of the box body 21, and a connection port 24 is arranged at a position of the box body 21 far from the flue gas inlet 5. The connection port 24 is used for connecting a flue gas passage.

[0039] Two groups of fixing blocks 23 are fixedly arranged inside the box body 21. The fixing blocks 23 are arranged along the flue gas flow direction. A filtering component 22 is fixedly arranged on the fixing blocks 23. The filtering component 22 includes a grille 221 fixedly arranged inside the box body 21, and a fiber layer 223 is fixedly arranged at a position inside the box body 21 far from the flue gas inlet 5 along the flue gas flow direction.

[0040] When the flue gas enters the inside of the box body 21 through the flue gas inlet 5, the large particles attached to the flue gas will be blocked by the grille 221 fixedly arranged inside the box body 21, and the smaller particles will be adsorbed by the fiber layer 223, so as to achieve the preliminary filtering of the flue gas before entering the next process.

[0041] As Figure 1 and Figures 4-5 shown, a connecting pipe 4 is fixedly connected to a side of the connection port 24 far from the filtering mechanism 2. At the same time, a heat exchange mechanism 3 is fixedly arranged at the upper end of the frame body 1. The heat exchange mechanism 3 is fixedly connected to the connecting pipe 4. The heat exchange mechanism 3 is used for transferring the waste heat in the flue gas to the medium to be heated.

[0042] The heat exchange mechanism 3 includes a bottom plate 34 fixedly arranged on the frame 1. The bottom plate 34 is in a hollow shape (not shown in the figure). On both sides of the bottom plate 34, two groups of guard plates 33 are fixedly arranged, and an upper guard plate 37 is fixedly erected at the upper ends of the guard plates 33;

[0043] Meanwhile, a heat exchange component 35 is fixedly arranged between the bottom plate 34 and the upper guard plate 37. The heat exchange component 35 includes a heated medium inlet 31 and a heated medium outlet 32 fixedly arranged at the upper end of the upper guard plate 37;

[0044] At the upper end of the upper guard plate 37, a heat exchange tube 351 is fixedly arranged. The heat exchange tube 351 is in a U shape and sequentially penetrates through the upper guard plate 37 and extends to the bottom plate 34. Meanwhile, at both ends of the heat exchange tube 351, multiple groups of delivery pipes 352 are fixedly arranged. The delivery pipes 352 are communicated with the heated medium inlet 31 and the heated medium outlet 32;

[0045] When the flue gas passes through the connecting pipe 4 along the flow direction, the heated medium can be put in from the heated medium inlet 31 and conveyed along the delivery pipes 352 into the neatly arranged heat exchange tubes 351. The flue gas exchanges heat with the medium to be heated through the heat exchange tubes 351 in the heat exchange mechanism 3. The waste heat in the waste gas is absorbed by the medium, increasing the temperature of the medium, and finally discharged from the heated medium outlet 32;

[0046] Meanwhile, a smoke outlet 6 is arranged on one side of the heat exchange mechanism 3 away from the connecting pipe 4 along the flue gas flow direction;

[0047] Such as Figure 1 and Figures 5-6 shown, a cleaning component 36 is sleeved on the heat exchange tubes 351. The cleaning component 36 is used for cleaning the condensed water formed by pollutants on the heat exchange tubes 351;

[0048] The cleaning component 36 includes multiple groups of cylinders 361 fixedly arranged at the upper end of the upper guard plate 37. The output ends of the cylinders 361 penetrate through the upper guard plate 37 and are fixedly connected with a connecting block 362. Meanwhile, a sealing ring (not shown in the figure) is added at the connection between the output ends of the cylinders 361 and the upper guard plate 37. On one side of the connecting block 362, multiple groups of cleaning rings 363 are fixedly connected. A connecting rod 364 is fixedly arranged between the multiple groups of cleaning rings 363;

[0049] Meanwhile, the multiple groups of cleaning rings 363 are sleeved on the multiple groups of heat exchange tubes 351;

[0050] A collection mechanism 7 is fixedly arranged at the lower end of the frame 1. The collection mechanism 7 is used for collecting the condensed water on the heat exchange tubes 351;

[0051] When there is condensed water on the heat exchange tube 351, the cylinder 361 will push the connecting block 362 to drive the cleaning ring 363 to clean the condensed water on the heat exchange tube 351, and the condensed water will fall into the collection mechanism 7 fixedly arranged at the lower end;

[0052] In summary, when the flue gas enters the smoke inlet 5, the filter assembly 22 in the filtering mechanism 2 will initially filter the flue gas, reducing the pollutants in the flue gas;

[0053] When the filtered flue gas enters the heat exchange mechanism 3 through the connecting pipe 4, the flue gas in the heat exchange mechanism 3 exchanges heat with the medium to be heated through the heat exchange tube 351, and the waste heat in the waste gas is absorbed by the medium, increasing the temperature of the medium;

[0054] While the temperature of the heating medium rises, the temperature of the flue gas decreases and part of the pollutants in the flue gas condense into condensed water and condense on the heat exchange tube 351. At this time, the cylinder 361 in the cleaning assembly 36 will push the cleaning ring 363 to clean the heat exchange tube 351, and finally the cleaned condensed water is collected by the collection mechanism 7.

[0055] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. Flue gas waste heat recovery device, characterized in that: include: Frame (1); A filtering mechanism (2), the filtering mechanism (2) being located at the smoke inlet at the upper end of the frame (1), and the filtering mechanism (2) being used for performing preliminary filtering on the smoke recovered from waste heat; A heat exchange mechanism (3), the heat exchange mechanism (3) being fixedly arranged at the upper end of the frame (1), the heat exchange mechanism (3) being used to transfer residual heat in the flue gas to a medium that needs to be heated, and a heat exchange pipe (351) being arranged on the heat exchange mechanism (3); A cleaning component (36), the cleaning component (36) being sleeved on the heat exchange tube (351), the cleaning component (36) being used for cleaning condensed water formed by condensation of pollutants on the heat exchange tube (351), the cleaning component (36) comprising: A cylinder (361), the cylinder (361) being fixedly arranged at the upper end of the heat exchange mechanism (3); A cleaning ring (363), the cleaning ring (363) being sleeved on the heat exchange tube (351); A collecting mechanism (7), the collecting mechanism (7) is located at the lower end of the frame (1), and the collecting mechanism (7) is used to collect condensed water on the heat exchange tube (351).

2. The flue gas waste heat recovery device according to claim 1, characterized in that: The filtering mechanism (2) comprises a box body (21) fixedly arranged at the upper end of the frame body (1); the interior of the box body (21) is a hollow cavity; a smoke inlet (5) is fixedly arranged at the smoke inlet of the box body (21); and a connection port (24) is arranged at a position of the box body (21) away from the smoke inlet (5).

3. The flue gas waste heat recovery device according to claim 2, characterized in that: Two groups of fixed blocks (23) are fixedly arranged inside the box body (21), the fixed blocks (23) are arranged along the direction of smoke flow, a filter assembly (22) is fixedly arranged on the fixed blocks (23), the filter assembly (22) comprises a grille (221) fixedly arranged inside the box body (21), and a fiber layer (223) is fixedly arranged inside the box body (21) at a position away from the smoke inlet (5) along the direction of smoke flow.

4. The flue gas waste heat recovery device according to claim 2, characterized in that: A connecting pipe (4) is fixedly connected to the side of the connecting port (24) away from the filtering mechanism (2).

5. The flue gas waste heat recovery device according to claim 1, characterized in that: The heat exchange mechanism (3) comprises a bottom plate (34) fixedly arranged on the frame (1), the bottom plate (34) being hollow, two groups of guard plates (33) being fixedly arranged on both sides of the bottom plate (34), and an upper guard plate (37) being fixedly arranged on the upper end of the guard plate (33); A heat exchange assembly (35) is fixedly arranged between the bottom plate (34) and the upper guard plate (37), and the heat exchange assembly (35) comprises a heated medium inlet (31) and a heated medium outlet (32) fixedly arranged at the upper end of the upper guard plate (37); a plurality of delivery pipes (352) are fixedly arranged at both ends of the heat exchange pipe (351); the delivery pipes (352) are fixedly connected to the heated medium inlet (31) and the heated medium outlet (32); and a smoke outlet (6) is arranged on one side of the heat exchange mechanism (3) along the smoke flow direction.

6. The flue gas waste heat recovery device according to claim 1, characterized in that: The output end of the cylinder (361) is fixedly connected to a connecting block (362), and a connecting rod (364) is fixedly arranged between the cleaning rings (363).

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