Circulating boiler flue gas waste heat recovery structure

Abstract

The utility model relates to the technical field of flue gas waste heat recovery, in particular to a circulating boiler flue gas waste heat recovery structure which comprises a waste heat recoverer. A smoke inlet device is mounted on the rear side of the box body; a frame fixedly connected with the connecting plate is arranged between the two side plates, the frame penetrates through the inserting groove and is matched with the inserting groove in an inserted mode, and a dust filtering net used for filtering and dedusting smoke is fixed in an opening of the frame; on one hand, impurities such as dust in flue gas can be filtered under the filtering action of the multiple dust filtering nets, the situation that the dust and the like enter a flue gas pipeline and scale is formed on the inner wall of the pipeline is avoided, and the heat exchange effect and the heat exchange efficiency of the pipelines such as the heat exchange pipe are guaranteed; and on the other hand, the flue gas enters the multiple heat exchange pipes, a water source in a heat exchange pipe cavity can be heated through the heat exchange pipes, waste heat in the flue gas can be recycled, the recycling effect of the waste heat of the filtered flue gas is guaranteed through the design, and the flue gas can be filtered easily.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas waste heat recovery, in particular to a circulating boiler flue gas waste heat recovery structure. Background Technique

[0002] The waste heat of boiler flue gas refers to the heat carried by the flue gas generated during the combustion process of the boiler that has not been fully utilized. This part of the heat has great value for recovery and utilization, which is of great significance for improving the thermal efficiency of the boiler, reducing energy consumption and reducing emission pollution; and in the process of recovering the waste heat of boiler flue gas, a heat exchanger is required.

[0003] The utility model patent with the authorization announcement number CN206771406U discloses a boiler flue gas waste heat recovery system. The boiler flue gas waste heat recovery system includes a horizontally arranged cylindrical shell. Smoke inlet joints and smoke outlet joints are respectively arranged at both ends of the shell. One ends of the smoke inlet joint and the smoke outlet joint both extend into the shell. The other ends of the smoke inlet joint and the smoke outlet joint are respectively fixedly connected with flange plates. A flue gas pipeline made of breathable material is arranged along the axial direction in the shell. Both ends of the flue gas pipeline are fixedly connected with the smoke inlet joint and the smoke outlet joint respectively. A flue gas chamber is formed in the flue gas pipeline. The flue gas chamber is respectively communicated with the smoke inlet joint and the smoke outlet joint. A heat exchange layer is arranged between the outer wall of the flue gas pipeline and the inner wall of the shell. A heat exchange device is arranged in the heat exchange layer. Water inlets and water outlets are spaced apart on the shell. The water inlets and water outlets are respectively communicated with the heat exchange device. End covers for blocking the heat exchange layer are respectively arranged between the inner walls at both ends of the shell and the outer walls of the smoke inlet joint and the smoke outlet joint. A flue gas pipeline is arranged in the shell. The flue gas pipeline divides the interior of the shell into a heat exchange layer and a flue gas chamber. When the boiler is in use, the generated flue gas enters the flue gas chamber through the smoke inlet joint. When the flue gas passes through the flue gas chamber, a large amount of heat energy in the flue gas heats the cold water in the heat exchange device. The heat exchange device is in a serpentine tube structure and is distributed on the outer circumference of the flue gas pipeline, making full use of the heat of the flue gas in the flue gas chamber to recover and utilize the heat in the flue gas.

[0004] Although the boiler flue gas waste heat recovery system can make full use of the flue gas heat, there are the following problems in the actual use of this device: the high-temperature flue gas discharged from the boiler directly enters the equipment through the smoke inlet joint without being filtered. There are many impurities such as dust in the flue gas. Directly discharging into the equipment will cause the deposition of impurities such as dust inside the flue gas pipeline and the flue gas chamber. In the long run, it will cause scaling on the inner walls of the flue gas pipeline and the flue gas chamber, seriously affecting the heat exchange effect of the equipment. In view of this, we propose a circulating boiler flue gas waste heat recovery structure. Content of the Utility Model

[0005] The purpose of the utility model is to provide a circulating boiler flue gas waste heat recovery structure to solve the problems raised in the above background technique.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] A cyclic boiler flue gas waste heat recovery structure includes a waste heat recovery device. The waste heat recovery device includes a box body. An inlet flue chamber, a heat exchange chamber and an exhaust flue chamber are sequentially arranged in the box body from back to front; an inlet flue pipe communicated with the inlet flue chamber is installed at the rear end of the box body, and an exhaust flue pipe communicated with the exhaust flue chamber is installed at the front end of the box body; a plurality of heat exchange pipes are installed in the heat exchange chamber, and the heat exchange pipes are communicated with the inlet flue chamber and the exhaust flue chamber; a circulation pipe is arranged below the box body, two ends of the circulation pipe are respectively communicated with the inlet flue pipe and the exhaust flue pipe, and a circulation fan is installed at the circulation pipe.

[0008] An inlet flue device is installed at the rear side of the box body. The inlet flue device includes a hollow shell body. Two slots are arranged on the right end face. Guide sleeves are installed at both the upper and lower ends of the shell body; the inlet flue pipe is communicated with the shell body, and a connecting pipe for connecting a boiler chimney is further installed at the rear end face of the shell body; two connecting sleeves are fixed to the left end face of the shell body, a sliding cavity is arranged at the top of the connecting sleeve, a connecting frame is slidably installed in each sliding cavity, and inserting rods are fixed to one end faces of the two connecting frames facing away from each other; a double-headed lead screw is arranged between the two connecting frames, and thread grooves at both ends of the double-headed lead screw are respectively in threaded connection with the two connecting frames.

[0009] A connecting plate is arranged on the right side of the shell body. Side plates are fixed to both the upper and lower parts of the connecting plate. The side plates pass through the openings of the guide sleeves and are slidably connected with the guide sleeves. Insertion holes for inserting the inserting rods are arranged at the ends of the side plates; a frame fixedly connected with the connecting plate is arranged between the two side plates. The frame passes through the slots and is in plug-in fit with the slots. A dust filter screen for filtering and removing dust from the flue gas is fixed in the opening of the frame.

[0010] As a preferred technical solution of the utility model, an adjusting screw is coaxially key-connected to the center of the double-headed lead screw, and a plurality of anti-slip grooves are arranged on the outer wall of the adjusting screw.

[0011] As a preferred technical solution of the utility model, a limiting block is fixed at the end of the side plate, and the limiting block is in a convex shape.

[0012] As a preferred technical solution of the utility model, strip-shaped grooves are arranged on the side plates, and the cross-sectional shape of the strip-shaped grooves is rectangular.

[0013] As a preferred technical solution of the utility model, a handle is installed on the outer wall of the connecting plate, and the handle is fixedly connected with the connecting plate through a bolt.

[0014] As a preferred technical solution of the utility model, guide rails are fixed to both side walls of the sliding cavity, and guide grooves slidably connected with the guide rails are arranged on both side walls of the connecting frame.

[0015] As a preferred technical solution of the present utility model, the cross-sectional shape of the connecting frame is in a square shape, and the connecting frame and the insertion rod are of an integrally formed structure.

[0016] As a preferred technical solution of the present utility model, a first one-way valve is installed on the smoke inlet pipe, and a second one-way valve is installed at the rear end of the circulation pipe.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1. By providing the waste heat recovery device and the smoke inlet device: on the one hand, before the flue gas enters the waste heat recovery device, it first passes through a plurality of dust filters. Under the filtering action of the plurality of dust filters, dust and other impurities in the flue gas can be filtered, avoiding the situation that dust and the like enter the flue gas pipeline and cause scaling on the inner wall of the pipeline, and ensuring the heat exchange effect and heat exchange efficiency of pipelines such as heat exchange tubes; on the other hand, the flue gas enters into a plurality of heat exchange tubes, and the heat exchange tubes can heat the water source in the heat exchange tube cavity, thereby facilitating the recovery of the waste heat in the flue gas. At the same time, when the flue gas is discharged through the exhaust pipe, part of the flue gas flows back into the smoke inlet pipe under the action of the circulation pipe and the circulation fan, and re-enters the heat exchange tubes to conduct heat exchange again; this design not only ensures the recovery and utilization effect of the filtered flue gas waste heat, but also facilitates the filtering treatment of the flue gas and ensures the heat exchange efficiency.

[0019] 2. By providing structures such as the connecting plate and the side plate, it is convenient to push out a plurality of dust filters from the housing, thereby facilitating the cleaning of the dust filters and ensuring the filtering effect of the dust filters on the high-temperature flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 is a sectional view of the structure of the waste heat recovery device in the present utility model;

[0022] Figure 3 is a partial schematic diagram of the present utility model;

[0023] Figure 4 is a schematic diagram of the structure of the connecting frame in the present utility model;

[0024] Figure 5 is a schematic diagram of the structure of the smoke inlet device in the present utility model;

[0025] Figure 6 is a partial exploded view of the structure of the smoke inlet device in the present utility model;

[0026] In the figure:

[0027] 1. Waste heat recovery device; 10. Box body; 101. Smoke inlet chamber; 102. Smoke exhaust chamber; 103. Heat exchange chamber; 11. Heat exchange tube; 12. Smoke inlet pipe; 120. First one-way valve; 13. Smoke exhaust pipe; 14. Water inlet; 15. Drainage port; 16. Circulation pipe; 160. Second one-way valve; 17. Circulation fan;

[0028] 2. Smoke inlet device; 20. Housing; 201. Guide sleeve; 202. Slot; 21. Connecting sleeve; 210. Sliding cavity; 211. Guide rail; 22. Connecting frame; 220. Plug rod; 23. Double-headed lead screw; 230. Adjusting screw; 24. Frame; 240. Dust filter screen; 25. Connecting plate; 250. Handle; 26. Side plate; 260. Strip-shaped groove; 261. Jack; 262. Limiting block; 27. Connecting pipe. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] This embodiment provides a technical solution:

[0031] Please refer to Figures 1-6As shown in the figure, the waste heat recovery structure of the circulating boiler flue gas includes a waste heat recovery device 1. The waste heat recovery device 1 includes a box body 10. An inlet flue chamber 101, a heat exchange chamber 103, and an exhaust flue chamber 102 are successively arranged inside the box body 10 from back to front; an inlet flue pipe 12 communicating with the inlet flue chamber 101 is installed at the rear end of the box body 10, and an exhaust flue pipe 13 communicating with the exhaust flue chamber 102 is installed at the front end of the box body 10; a plurality of heat exchange pipes 11 are installed in the heat exchange chamber 103, and the heat exchange pipes 11 communicate with the inlet flue chamber 101 and the exhaust flue chamber 102; a circulating pipe 16 is arranged below the box body 10, and both ends of the circulating pipe 16 are respectively connected to the inlet flue pipe 12 and the exhaust flue pipe 13, and a circulating fan 17 is installed at the circulating pipe 16; an inlet flue device 2 is installed at the rear side of the box body 10. The inlet flue device 2 includes a hollow shell 20, two slots 202 are opened on the right end face, and guide sleeves 201 are installed at both the upper and lower ends of the shell 20; the inlet flue pipe 12 is connected to the shell 20, and a connecting pipe 27 for connecting the boiler chimney is further installed at the rear end face of the shell 20; two connecting sleeves 21 are fixed to the left end face of the shell 20, a sliding cavity 210 is opened at the top of the connecting sleeve 21, and connecting frames 22 are slidably installed in the sliding cavities 210. Plug rods 220 are fixed to the two opposite end faces of the two connecting frames 22; a double-headed screw rod 23 is arranged between the two connecting frames 22, and the thread grooves at both ends of the double-headed screw rod 23 are respectively threadedly connected to the two connecting frames 22; a connecting plate 25 is arranged on the right side of the shell 20, side plates 26 are fixed to both the upper and lower parts of the connecting plate 25, the side plates 26 pass through the openings of the guide sleeves 201 and are slidably connected to the guide sleeves 201, and insertion holes 261 for inserting the plug rods 220 are opened at the ends of the side plates 26; a frame 24 fixedly connected to the connecting plate 25 is arranged between the two side plates 26, the frame 24 passes through the slots 202 and is in plug-in fit with the slots 202, and a dust filter screen 240 for filtering and removing dust from the flue gas is fixed inside the opening of the frame 24.

[0032] In this embodiment, an adjusting screw 230 is coaxially key-connected to the center of the double-headed screw rod 23, and a plurality of anti-slip grooves are opened on the outer wall of the adjusting screw 230. The anti-slip grooves and the adjusting screw 230 facilitate the rotation of the double-headed screw rod 23 and improve the convenience of operation.

[0033] In this embodiment, a limiting block 262 is fixed to the end of the side plate 26, and the limiting block 262 is in a convex shape. The limiting block 262 plays a limiting role on the side plate 26 and can prevent the side plate 26 from disengaging from the guide sleeve 201.

[0034] In this embodiment, strip-shaped grooves 260 are opened on the side plates 26, and the cross-sectional shape of the strip-shaped grooves 260 is rectangular. The arrangement of the strip-shaped grooves 260 is beneficial for users to perform operations such as cleaning the dust filter screen 240.

[0035] In this embodiment, a handle 250 is installed on the outer wall of the connecting plate 25, and the handle 250 is fixedly connected to the connecting plate 25 by bolts. The setting of the handle 250 facilitates pushing and pulling the connecting plate 25, improving the convenience of operation.

[0036] In this embodiment, guide rails 211 are fixedly installed on both side walls of the sliding cavity 210, and guide grooves 221 slidably connected to the guide rails 211 are provided on both side walls of the connecting frame 22. The settings of the guide rails 211 and the guide grooves 221 increase the smoothness and stability of the connecting frame 22 during lifting and lowering.

[0037] In this embodiment, the cross-sectional shape of the connecting frame 22 is in a square shape, and the connecting frame 22 and the insertion rod 220 are of an integrally formed structure. The integrally formed connecting frame 22 and insertion rod 220 have better structural strength, ensuring the service life of the connecting frame 22 and the insertion rod 220, and the square shape design is conducive to saving production materials.

[0038] In this embodiment, a first one-way valve 120 is installed on the smoke inlet pipe 12, and a second one-way valve 160 is installed at the rear end of the circulation pipe 16. The setting of the first one-way valve 120 can prevent the flue gas in the circulation pipe 16 from flowing back into the housing 20, and the setting of the second one-way valve 160 can prevent the flue gas in the smoke inlet pipe 12 from entering the circulation pipe 16.

[0039] It can be understood that on the right end face of the box body 10 in this embodiment, a water inlet 14 and a drain outlet 15 are respectively installed on the front and rear sides, and both the water inlet 14 and the drain outlet 15 are communicated with the heat exchange cavity 103. This design facilitates the entry and exit of water source into and from the heat exchange cavity 103.

[0040] It should be added that multiple heat exchange tubes 11 are distributed in a matrix, and the heat exchange tubes 11 are made of stainless steel. The setting of multiple heat exchange tubes 11 improves the heat exchange efficiency for high-temperature flue gas, and the stainless steel material has the advantages of corrosion resistance and high heat conduction efficiency, which not only ensures the service life of the heat exchange tubes 11 but also ensures the heat exchange effect.

[0041] During specific use, high-temperature flue gas enters the housing 20 through the connecting pipe 27. At the same time, the flue gas passes through multiple dust filters 240, and dust and the like in the flue gas are intercepted by the dust filters 240. The filtered flue gas enters the smoke inlet cavity 101 through the smoke inlet pipe 12 and directly enters multiple heat exchange tubes 11. At this time, the heat of the flue gas is absorbed by the heat exchange tubes 11, and at the same time, the heat of the heat exchange tubes 11 is absorbed by the water source, and the water source is heated. After the waste heat of the flue gas is recovered, it enters the exhaust pipe 13. At this time, the user turns on the power supply of the circulation fan 17, and part of the flue gas in the exhaust pipe 13 enters the circulation pipe 16 and returns to the smoke inlet pipe 12 through the circulation pipe 16, so that the waste heat of the flue gas can be recovered again;

[0042] When the dust filter 240 needs to be cleaned, the user first rotates the adjusting screw 230, and the double-headed screw 23 rotates. At this time, the connecting frames 22 on the upper and lower sides move synchronously toward the middle, and the connecting frames 22 drive the insertion rod 220 to disengage from the socket 261. Then the user holds the handle 250 and pulls it, and the connecting plate 25 drives the frame 24 to slide along the slot 202. When the dust filter 240 is exposed, the dust filter 240 can be cleaned.

[0043] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A circulating boiler flue gas waste heat recovery structure, comprising a waste heat recovery device (1), characterized in that: The waste heat recovery device (1) comprises a housing (10), wherein a smoke inlet chamber (101), a heat exchange chamber (103) and a smoke exhaust chamber (102) are sequentially provided inside the housing (10) from the back to the front; a smoke inlet pipe (12) connected to the smoke inlet chamber (101) is installed at the rear end of the housing (10), and a smoke exhaust pipe (13) connected to the smoke exhaust chamber (102) is installed at the front end of the housing (10); a plurality of heat exchange pipes (11) are installed in the heat exchange chamber (103), and the heat exchange pipes (11) are connected to the smoke inlet chamber (101) and the smoke exhaust chamber (102); a circulation pipe (16) is provided below the housing (10), and the two ends of the circulation pipe (16) are respectively connected to the smoke inlet pipe (12) and the smoke exhaust pipe (13), and a circulation fan (17) is installed at the circulation pipe (16); A smoke inlet (2) is installed on the rear side of the box body (10), and the smoke inlet (2) includes a hollow shell (20), and two slots (202) are provided on the right end face, and guide sleeves (201) are installed on the upper and lower ends of the shell (20); the smoke inlet pipe (12) is connected to the shell (20), and the rear end face of the shell (20) is also installed with a connecting pipe (27) for connecting to the boiler chimney; two connecting sleeves (21) are fixed on the left end face of the shell (20), and a sliding cavity (210) is provided on the top of the connecting sleeve (21), and connecting frames (22) are slidably installed in the sliding cavity (210), and two end faces of the two connecting frames (22) that are separated from each other are fixed with an insertion rod (220); a double-headed screw rod (23) is provided between the two connecting frames (22), and the thread grooves at both ends of the double-headed screw rod (23) are respectively threadedly connected to the two connecting frames (22); A connecting plate (25) is provided on the right side of the shell (20), and side plates (26) are fixed to the upper and lower parts of the connecting plate (25), and the side plates (26) pass through the opening of the guide sleeve (201) and are slidably connected to the guide sleeve (201), and the ends of the side plates (26) are provided with plug holes (261) for plugging the plug rod (220); a frame (24) fixedly connected to the connecting plate (25) is provided between the two side plates (26), and the frame (24) passes through the slot (202) and is plugged into the slot (202), and a dust filter (240) for filtering and removing dust from smoke is fixed in the opening of the frame (24).

2. The circulating boiler flue gas waste heat recovery structure according to claim 1 is characterized in that: An adjusting screw (230) is coaxially keyed at the center of the double-ended screw rod (23), and a plurality of anti-slip grooves are provided on the outer wall of the adjusting screw (230).

3. The circulating boiler flue gas waste heat recovery structure according to claim 1 is characterized in that: A limiting block (262) is fixed at the end of the side plate (26), and the limiting block (262) is convex.

4. The circulating boiler flue gas waste heat recovery structure according to claim 1 is characterized in that: The side plates (26) are each provided with a strip-shaped groove (260), and the cross-sectional shape of the strip-shaped groove (260) is rectangular.

5. The circulating boiler flue gas waste heat recovery structure according to claim 1 is characterized in that: A handle (250) is installed on the outer wall of the connecting plate (25), and the handle (250) is fixedly connected to the connecting plate (25) by means of bolts.

6. The circulating boiler flue gas waste heat recovery structure according to claim 1 is characterized in that: Guide rails (211) are fixed to both side walls of the sliding cavity (210), and guide grooves (221) slidably connected to the guide rails (211) are formed on both side walls of the connecting frame (22).

7. The circulating boiler flue gas waste heat recovery structure according to claim 1 is characterized in that: The cross-sectional shape of the connecting frame (22) is in the shape of a square, and the connecting frame (22) and the inserting rod (220) are an integrally formed structure.

8. The circulating boiler flue gas waste heat recovery structure according to claim 1 is characterized in that: A first one-way valve (120) is installed on the smoke inlet pipe (12), and a second one-way valve (160) is installed at the rear end of the circulation pipe (16).

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