Boiler waste heat recovery device

Abstract

The utility model provides a boiler waste heat recovery device which comprises a boiler, a drainage fan, a smoke pipe and a waste heat recovery box, a smoke outlet of the boiler is fixedly connected with a smoke inlet of a spiral pipe arranged in the waste heat recovery box through the drainage fan and the smoke pipe, and a stirring mechanism is arranged on the inner side of the spiral pipe. The stirring mechanism is arranged in the middle of the interior of the waste heat recovery box and is arranged on the inner side of the spiral pipe, the stirring mechanism is used for stirring the descaling agent in the waste heat recovery box, and the stirring of the descaling agent in the waste heat recovery box is achieved through the stirring mechanism; softened dirt on the inner wall of the waste heat recycling box and the outer side wall of the spiral pipe falls off and is taken away through the stirred descaling agent, the automatic descaling function is achieved, meanwhile, the cleaned dirt is discharged through the discharging barrel through the discharging spiral blade, the situation that the discharging barrel is blocked by the dirt is avoided, and the dirt cleaning efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a boiler waste heat recovery device. Background Art

[0002] A boiler is an energy conversion device. The energy input to the boiler includes chemical energy and electrical energy in the fuel. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. The flue gas generated after the fuel in the boiler is burned will carry a large amount of waste heat, and the waste heat recovery device can recover and reuse its energy. In the prior art, the waste heat recovery device for boiler flue gas exchanges heat between the flue gas and water, so as to achieve the purpose of preheating and recovery. However, after long-term use, scale will form on the surface of the pipes in the device, which will have an adverse effect on the heat transfer and reduce the efficiency of waste heat recovery.

[0003] The prior art discloses a boiler waste heat recovery device (publication number: CN216131944U), comprising a boiler, a waste heat recovery box is arranged on one side of the boiler, a heat exchange tube is installed inside the waste heat recovery box, a medicine feeding port is opened on the waste heat recovery box, a descaling mechanism is installed on the heat exchange tube, the descaling mechanism comprises a plurality of guide rails, a movable frame is slidably connected inside the plurality of guide rails, a reset spring is arranged between the two ends of the movable frame and the inner wall of the guide rail, and a driven rack is arranged at the center of the bottom of the movable frame; the utility model arranges a descaling mechanism, utilizes the medicine feeding port to feed a descaling agent into the waste heat recovery box, drives a fan-shaped gear to periodically contact with the driven rack through a driving motor, cooperates with the reset spring to drive the movable frame to swing back and forth, and the swing of the movable frame drives the tube brush to descale and scrape the heat exchange tube, thereby ensuring the heat exchange efficiency of the heat exchange tube and effectively improving the waste heat recovery efficiency.

[0004] However, the above technical solution and the prior art still have the following defects: during use, the device uses a tube brush to scrape and remove scale from the heat exchange tube, so that the scraped dirt is accumulated inside the waste heat recovery box, making it inconvenient to clean the removed dirt, causing the dirt to accumulate in the waste heat recovery box for a long time, affecting the subsequent waste heat recovery. Utility Model Content

[0005] The purpose of the utility model is to provide a boiler waste heat recovery device to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A boiler waste heat recovery device comprises a boiler, an induced draft fan, a flue gas pipe and a waste heat recovery box, wherein the smoke outlet of the boiler is connected and fixed to the smoke inlet of a spiral tube arranged inside the waste heat recovery box through the induced draft fan and the flue gas pipe, the bottom smoke outlet of the spiral tube is connected and fixed to the smoke outlet pipe arranged outside the waste heat recovery box, and a stirring mechanism is arranged on the inner side of the spiral tube, wherein the stirring mechanism is used for stirring a descaling agent put into the waste heat recovery box, removing dirt on the inner wall of the waste heat recovery box and the outer wall of the spiral tube, and uniformly treating the removed dirt to realize the function of automatic descaling.

[0008] Preferably, the stirring mechanism includes a servo motor, a rotating rod, a first stirring blade and a discharge spiral blade. The servo motor is arranged at the center of the top of the waste heat recovery box, and the output end of the servo motor is connected and fixed to the top of the rotating rod through a coupling. The rotating rod is provided with a first stirring blade, and the bottom of the rotating rod is provided with a discharge spiral blade. The discharge spiral blade is arranged on the inner side of the discharge barrel at the bottom of the waste heat recovery box, and the discharge barrel is provided with a discharge valve.

[0009] Preferably, fixing rods are provided on both sides of the rotating rod, the fixing rods are fixedly installed inside the waste heat recovery box, and a second stirring blade is provided on one side of the fixing rod, and the second stirring blade is staggered with the first stirring blade.

[0010] Preferably, a medicine feeding port is provided at the top of the waste heat recovery box, and a medicine outlet pipe is provided at the bottom of the waste heat recovery box.

[0011] Preferably, the waste heat recovery box is provided with a water inlet pipe and a water outlet pipe.

[0012] Preferably, the medicine outlet pipe and the water outlet pipe are arranged on the outside of the water outlet at the bottom of the waste heat recovery box, and a filter screen is arranged inside the water outlet.

[0013] Preferably, the smoke inside the smoke pipe flows through a smoke filter device for filtering the smoke.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. A stirring mechanism is arranged in the center of the waste heat recovery box, and the stirring mechanism is arranged on the inner side of the spiral tube. The stirring mechanism is used to stir the descaling agent inside the waste heat recovery box, and the softened dirt on the inner wall of the waste heat recovery box and the outer wall of the spiral tube is removed by the stirred descaling agent, thereby realizing the function of automatic descaling. At the same time, the discharge spiral blade is used to discharge the removed dirt through the discharge barrel, thereby avoiding the dirt from clogging the discharge barrel and improving the dirt removal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the waste heat recovery box of the utility model in cross-section;

[0018] Figure 3 This is a schematic diagram of the structure of the stirring mechanism of the utility model;

[0019] Figure 4 For the utility model Figure 2 The middle part is an enlarged structural diagram.

[0020] In the figure: 1. boiler; 2. induced draft fan; 3. flue gas pipe; 4. waste heat recovery box; 5. spiral pipe; 6. smoke outlet pipe; 7. medicine feeding port; 8. medicine outlet pipe; 9. stirring mechanism; 901. servo motor; 902. rotating rod; 903. first stirring blade; 904. unloading spiral blade; 10. fixing rod; 11. second stirring blade; 12. water inlet pipe; 13. water outlet pipe; 14. water outlet; 15. filter screen; 16. flue gas filtering device. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-4 , the utility model provides a technical solution:

[0023] Embodiment 1:

[0024] A boiler waste heat recovery device comprises a boiler 1, an induced draft fan 2, a flue gas pipe 3 and a waste heat recovery box 4. The smoke outlet of the boiler 1 is connected and fixed to the smoke inlet of a spiral tube 5 arranged inside the waste heat recovery box 4 through the induced draft fan 2 and the flue gas pipe 3. The bottom smoke outlet of the spiral tube 5 is connected and fixed to the smoke outlet pipe 6 arranged outside the waste heat recovery box 4. A stirring mechanism 9 is arranged on the inner side of the spiral tube 5. The stirring mechanism 9 is used for stirring a descaling agent put into the waste heat recovery box 4 to remove dirt on the inner wall of the waste heat recovery box 4 and the outer wall of the spiral tube 5, and uniformly treats the removed dirt to realize the function of automatic descaling.

[0025] The stirring mechanism 9 includes a servo motor 901, a rotating rod 902, a first stirring blade 903 and a discharge spiral blade 904. The servo motor 901 is arranged at the top center of the waste heat recovery box 4, and the output end of the servo motor 901 is connected and fixed to the top of the rotating rod 902 through a coupling. The first stirring blade 903 is arranged on the rotating rod 902, and the discharge spiral blade 904 is arranged at the bottom of the rotating rod 902. The discharge spiral blade 904 is arranged on the inner side of the discharge barrel at the bottom of the waste heat recovery box 4, and a discharge valve is arranged on the discharge barrel.

[0026] By arranging a stirring mechanism 9 on the inner side of the spiral tube 5, the descaling agent inside the waste heat recovery box 4 is stirred, and the softened dirt on the inner wall of the waste heat recovery box 4 and the outer wall of the spiral tube 5 is removed by the stirred descaling agent, thereby realizing the function of automatic descaling. At the same time, the discharge spiral blade 904 is used to discharge the removed dirt through the discharge barrel, thereby avoiding dirt clogging the discharge barrel and improving the dirt removal efficiency.

[0027] Fixed rods 10 are provided on both sides of the rotating rod 902, and the fixed rods 10 are fixedly installed inside the waste heat recovery box 4, and a second stirring blade 11 is provided on one side of the fixed rod 10, and the second stirring blade 11 is staggered with the first stirring blade 903. By arranging fixedly installed fixed rods 10 and second stirring blades 11 on both sides of the stirring mechanism 9, in the process of stirring the descaling agent by the stirring mechanism 9, the generation of vortexes causing unidirectional inertial motion and rising liquid level is prevented.

[0028] A medicine feeding port 7 is provided at the top of the waste heat recovery box 4 , and a medicine outlet pipe 8 is provided at the bottom of the waste heat recovery box 4 .

[0029] The waste heat recovery box 4 is provided with a water inlet pipe 12 and a water outlet pipe 13 .

[0030] The medicine outlet pipe 8 and the water outlet pipe 13 are arranged on the outside of the water outlet 14 at the bottom of the waste heat recovery box 4. A filter net 15 is arranged inside the water outlet 14. By arranging the filter net 15 inside the water outlet 14, the dirt inside the waste heat recovery box 4 can be filtered to prevent the pipeline from being blocked.

[0031] The flue gas inside the flue pipe 3 flows through the flue gas filter device 16 for filtering the flue gas. The flue gas filter device 16 is a filter device used for a boiler waste heat recovery device in the prior art, and is used to filter impurities in the flue gas.

[0032] Working principle: In actual use, after a sufficient amount of descaling agent is added into the waste heat recovery box 4 through the dosing port 7, the descaling agent is allowed to contact the inner wall of the waste heat recovery box 4 and the outer wall of the spiral tube 5 for a period of time, so that the descaling agent softens the dirt, and then the servo motor 901 is driven to drive the rotating rod 902 and the first stirring blade 903 to rotate, so as to stir the descaling agent inside the waste heat recovery box 4. The stirred descaling agent can take away the softened dirt, thereby realizing the function of dirt removal. After the descaling is completed, open the valve on the medicine discharge pipe 8, and recover the descaling agent inside the waste heat recovery box 4 to the required position through the medicine discharge pipe 8. The filter screen 15 is used to prevent dirt from clogging the pipeline. Then open the discharge valve on the discharge barrel. Through the design of the conical cylindrical waste heat recovery box 4, the dirt is at the bottom. The rotation of the discharge spiral blade 904 is used to discharge the dirt and the remaining descaling agent through the discharge barrel for processing. The descaling is completed, thereby ensuring the heat exchange efficiency of the spiral tube 5 and effectively improving the efficiency of waste heat recovery.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A boiler waste heat recovery device, comprising a boiler (1), an induced draft fan (2), a flue gas pipe (3) and a waste heat recovery box (4), characterized in that: The smoke outlet of the boiler (1) is connected and fixed to the smoke inlet of a spiral tube (5) arranged inside a waste heat recovery box (4) through a draft fan (2) and a smoke pipe (3); the bottom smoke outlet of the spiral tube (5) is connected and fixed to a smoke outlet pipe (6) arranged outside the waste heat recovery box (4); a stirring mechanism (9) is arranged on the inner side of the spiral tube (5); the stirring mechanism (9) is used to stir the descaling agent put into the waste heat recovery box (4), remove the dirt on the inner wall of the waste heat recovery box (4) and the outer wall of the spiral tube (5), and uniformly treat the removed dirt to achieve an automatic descaling function.

2. A boiler waste heat recovery device according to claim 1, characterized in that: The stirring mechanism (9) comprises a servo motor (901), a rotating rod (902), a first stirring blade (903) and a material discharge spiral blade (904); the servo motor (901) is arranged at the top center of the waste heat recovery box (4), and the output end of the servo motor (901) is connected and fixed to the top of the rotating rod (902) through a coupling; the rotating rod (902) is provided with a first stirring blade (903), and the bottom of the rotating rod (902) is provided with a material discharge spiral blade (904); the material discharge spiral blade (904) is arranged on the inner side of a discharge barrel at the bottom of the waste heat recovery box (4), and a discharge valve is provided on the discharge barrel.

3. A boiler waste heat recovery device according to claim 2, characterized in that: Fixed rods (10) are arranged on both sides of the rotating rod (902), and the fixed rods (10) are fixedly installed inside the waste heat recovery box (4). A second stirring blade (11) is arranged on one side of the fixed rod (10), and the second stirring blade (11) is arranged alternately with the first stirring blade (903).

4. A boiler waste heat recovery device according to claim 1, characterized in that: The top of the waste heat recovery box (4) is provided with a medicine feeding port (7), and the bottom of the waste heat recovery box (4) is provided with a medicine outlet pipe (8).

5. A boiler waste heat recovery device according to claim 4, characterized in that: The waste heat recovery box (4) is provided with a water inlet pipe (12) and a water outlet pipe (13).

6. A boiler waste heat recovery device according to claim 5, characterized in that: The medicine outlet pipe (8) and the water outlet pipe (13) are arranged outside a water outlet (14) at the bottom of the waste heat recovery box (4), and a filter screen (15) is arranged inside the water outlet (14).

7. The boiler waste heat recovery device according to claim 1, characterized in that: The smoke inside the smoke pipe (3) flows through the smoke filter device (16) for filtering the smoke.

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