Flue gas waste heat utilization device of gas-fired boiler

Abstract

The utility model belongs to the technical field of waste heat utilization equipment, and particularly relates to a gas-fired boiler flue gas waste heat utilization device which comprises a heat exchange box. The flue gas dust removal cavity is formed in the bottom of the heat exchange box, an air inlet hole is formed in a box body on one side of the flue gas dust removal cavity, an air inlet pipe is fixedly installed at the air inlet hole, a filter plate is fixedly installed on the upper portion in the flue gas dust removal cavity, sliding rails are arranged on the two sides of the lower portion of the filter plate, scraping plates are arranged in the sliding rails in a sliding mode, and sliding blocks are fixedly connected to the bottoms of the scraping plates. Threaded holes are formed in the sliding blocks, a heat exchanger is fixedly installed in the heat exchange cavity, the air inlet end of the heat exchanger is fixedly connected to a top plate of the flue gas dust removal cavity, the air outlet end of the heat exchanger is fixedly connected to the inner wall of one side of the heat exchange cavity, a water inlet pipe is fixedly connected to a cavity body at the lower end of one side of the heat exchange cavity, and a water outlet pipe is fixedly connected to a cavity body at the upper end of the other side of the heat exchange cavity. The flue gas is dedusted firstly, so that dust particles in the flue gas are prevented from being attached to the inner wall of the heat exchanger pipeline and corroding the heat exchanger pipeline.

Description

Technical Field

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

[0002] Waste heat from flue gas from gas boilers refers to the heat still contained in the flue gas emitted by gas boilers. This heat can be recovered and used before the flue gas is discharged into the atmosphere. By recovering the waste heat from flue gas from gas boilers, the thermal efficiency of the boiler can be improved, energy consumption can be reduced, and thermal pollution to the atmosphere can also be reduced.

[0003] Waste heat recovery devices usually use heat exchangers or waste heat boilers for recovery. In the heat exchanger, the flue gas and the heated water or air flow through their own channels, and the heat in the flue gas is transferred to the water or air through the wall heat exchange method. The waste heat boiler is a device that converts the heat in the flue gas into steam or hot water, which can be used for heating, power generation and other purposes.

[0004] It has been found in the use of existing gas boiler flue gas waste heat utilization devices that the flue gas after gas combustion contains a large amount of dust particles. The dust in the flue gas contains corrosive components and adheres to the inner wall of the pipe of the heat exchange device for a long time, which may corrode the pipe wall and shorten the service life of the equipment. Therefore, a gas boiler flue gas waste heat utilization device is proposed to solve the above problem. Utility Model Content

[0005] In order to make up for the shortcomings of the existing technology, it is found in the use of the existing gas boiler flue gas waste heat utilization device that the flue gas after the gas combustion contains a large amount of dust particles. The dust in the flue gas contains corrosive components and adheres to the inner wall of the pipe of the heat exchange device for a long time, which may corrode the pipe wall and shorten the service life of the equipment. The utility model proposes a gas boiler flue gas waste heat utilization device.

[0006] The technical solution adopted by the utility model to solve its technical problems is as follows: a gas boiler flue gas waste heat utilization device described in the utility model comprises a heat exchange box; the heat exchange box is divided into three chambers: a flue gas treatment chamber, a heat exchange chamber, and a flue gas dust removal chamber, the flue gas dust removal chamber is arranged at the bottom of the heat exchange box, an air inlet hole is opened on one side of the flue gas dust removal chamber, an air inlet pipe is fixedly installed at the air inlet hole, a filter plate is fixedly installed at the upper part of the flue gas dust removal chamber, slide rails are arranged on both sides below the filter plate, a scraper is slidably arranged in the slide rail, a slider is fixedly connected to the bottom of the scraper, a threaded hole is opened in the slider, a heat exchanger is fixedly installed in the heat exchange chamber, The air inlet end of the heat exchanger is fixedly connected to the top plate of the flue gas dust removal chamber, and the air outlet end is fixedly connected to the inner wall of one side of the heat exchange chamber. A water inlet pipe is fixedly connected to the lower end cavity of one side of the heat exchange chamber, and a water outlet pipe is fixedly connected to the upper end cavity of the other side. An air distribution pipe is fixedly arranged in the lower part of the flue gas treatment chamber, and the air inlet end of the air distribution pipe is fixedly connected to the inner wall of the flue gas treatment chamber. The air outlet end of the heat exchanger is fixedly connected to the air inlet end of the air distribution pipe by a connecting pipe, and a one-way valve is arranged in the connecting pipe. An exhaust pipe is fixedly connected to one side of the top of the heat exchange box. By first removing dust from the flue gas, dust particles in the flue gas are prevented from adhering to the inner wall of the heat exchanger pipe and causing corrosion thereto.

[0007] Preferably, a pH detector is fixedly installed on one side of the upper end of the heat exchange box, and the detection end of the pH detector is arranged at the bottom of the flue gas treatment chamber, and the pH value of the liquid inside the flue gas treatment chamber is detected by the pH detector.

[0008] Preferably, a storage tank is provided on one side of the top of the heat exchange box, and the storage tank is fixedly connected to the heat exchange box through a feed pipe. A flow control valve is provided in the feed pipe, and the amount of alkaline agent added is controlled by the flow control valve.

[0009] Preferably, a stirring motor is fixedly installed on one side of the upper end of the heat exchange box, a stirring shaft is provided in the upper part of the flue gas treatment chamber, both ends of the stirring shaft are rotatably installed in the heat exchange box through bearings, a plurality of stirring rods are installed in an array on the stirring shaft, and the front end of the rotating shaft of the stirring motor is fixedly connected to one end of the stirring shaft, and the alkaline agent added to the liquid in the flue gas treatment chamber is stirred by the stirring rod to accelerate the dissolution of the alkaline agent.

[0010] Preferably, a screw rod is vertically arranged below the scraper, the slider is slidably mounted on the screw rod, both ends of the screw rod are rotatably mounted in the heat exchange box through bearings, a drive motor is fixedly mounted on one side of the lower end of the heat exchange box, the driving motor rotating shaft is fixedly connected to one end of the screw rod, and the scraper is driven to move by the screw rod to clean the dust attached to the bottom of the filter plate.

[0011] Preferably, a hopper is fixedly installed at the bottom of the heat exchange box, an ash discharge pipe is fixedly installed at the bottom of the hopper, a sliding hole is opened on one side of the ash discharge pipe, a sealing plate is slidably installed in the sliding hole, and the dust in the hopper is removed by taking out the sealing plate.

[0012] The utility model is beneficial in that:

[0013] 1. The utility model uses the waste heat utilization device, and the flue gas enters the flue gas dust removal chamber through the air inlet pipe, passes upward through the filter plate to filter the dust therein, and then enters the heat exchanger through the air inlet end of the heat exchanger, and injects heat exchange liquid into the heat exchange chamber through the water inlet pipe. The heat exchange liquid exchanges heat with the flue gas in the pipe through the heat exchange plate. The heat exchange liquid absorbs heat and the temperature rises. The heat exchange liquid is discharged through the water outlet pipe, and the flue gas enters the connecting pipe through the air outlet end of the heat exchanger, and then enters the air distribution pipe, and is discharged into the alkali liquid in the flue gas treatment chamber through the air holes on the air distribution pipe, reacts with the alkali liquid, and the treated gas is discharged through the exhaust pipe. The structural design of the heat exchange box realizes the function of flue gas dust removal, and solves the problem found in the use of the existing gas boiler flue gas waste heat utilization device that the flue gas after gas combustion contains a large amount of dust particles, and the dust in the flue gas contains corrosive components, which adheres to the inner wall of the pipe of the heat exchange device for a long time, may corrode the pipe wall, shorten the service life of the equipment, and increase the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 This is a structural diagram of one side of the waste heat utilization device;

[0016] Figure 2 This is a schematic diagram of the structure of the other side of the waste heat utilization device;

[0017] Figure 3 This is a schematic diagram of the internal horizontal structure of the waste heat utilization device;

[0018] Figure 4 It is a schematic diagram of the internal longitudinal structure of the waste heat utilization device;

[0019] Figure 5 This is a schematic diagram of the air pipe structure.

[0020] In the figure: 1. heat exchange box; 2. exhaust pipe; 3. storage tank; 4. discharge pipe; 5. flow control valve; 6. stirring motor; 7. stirring shaft; 8. stirring rod; 9. air distribution pipe; 10. pH value detector; 11. connecting pipe; 12. one-way valve; 13. water outlet pipe; 14. heat exchanger; 15. water inlet pipe; 16. filter plate; 17. slider; 18. screw rod; 19. scraper; 20. slide rail; 21. air inlet pipe; 22. sealing plate; 23. drive motor. 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 1-5As shown, a gas boiler flue gas waste heat utilization device comprises a heat exchange box 1; the heat exchange box 1 is divided into three chambers: a flue gas treatment chamber, a heat exchange chamber, and a flue gas dust removal chamber, the flue gas dust removal chamber is arranged at the bottom of the heat exchange box 1, an air inlet hole is opened on one side of the flue gas dust removal chamber, an air inlet pipe 21 is fixedly installed at the air inlet hole, a filter plate 16 is fixedly installed at the upper part of the flue gas dust removal chamber, slide rails 20 are arranged on both sides below the filter plate 16, a scraper 19 is slidably arranged in the slide rail 20, a slider 17 is fixedly connected to the bottom of the scraper 19, a threaded hole is opened in the slider 17, and a heat exchange chamber is provided with a heat exchange chamber. A heat exchanger 14 is fixedly installed, the air inlet end of the heat exchanger 14 is fixedly connected to the top plate of the flue gas dust removal chamber, and the air outlet end is fixedly connected to the inner wall of one side of the heat exchange chamber. A water inlet pipe 15 is fixedly connected to the lower end cavity of one side of the heat exchange chamber, and a water outlet pipe 13 is fixedly connected to the upper end cavity of the other side. An air distribution pipe 9 is fixedly arranged at the lower part of the flue gas treatment chamber, and the air inlet end of the air distribution pipe 9 is fixedly connected to the inner wall of the flue gas treatment chamber. The air outlet end of the heat exchanger 14 is fixedly connected to the air inlet end of the air distribution pipe 9 through a connecting pipe 11, and a one-way valve 12 is arranged in the connecting pipe 11. The top side of the heat exchange box 1 is fixedly connected There is an exhaust pipe 2; when working, it is found in the use of the existing gas boiler flue gas waste heat utilization device that the flue gas after the gas combustion contains a large amount of dust particles. The dust in the flue gas contains corrosive components and adheres to the inner wall of the heat exchange device pipe for a long time, which may corrode the pipe wall and shorten the service life of the equipment. When the waste heat utilization device is used, the flue gas enters the flue gas dust removal chamber through the air inlet pipe 21, and upwardly passes through the filter plate 16 to filter the dust therein, and then enters the heat exchanger 14 through the air inlet end of the heat exchanger 14, and injects heat exchange liquid into the heat exchange chamber through the water inlet pipe 15. The heat exchange liquid exchanges heat with the flue gas in the pipe through the heat exchange plate. The temperature rises after absorbing heat, and the heat exchange liquid is discharged through the outlet pipe 13. The flue gas enters the connecting pipe 11 through the outlet end of the heat exchanger 14, and then enters the air distribution pipe 9. At this time, the one-way valve 12 prevents the alkali solution from flowing back into the heat exchanger 14. The alkali solution is discharged into the flue gas treatment chamber through the air holes on the air distribution pipe 9 to react with the alkali solution. The treated gas is discharged from the heat exchange box 1 through the exhaust pipe 2. During the filtration process of the filter plate 16, dust will adhere to the bottom of the filter plate 16. The slider 17 drives the scraper 19 to slide in the slide rail 20 to clean the bottom plane of the filter plate 16 to prevent the filter plate 16 from being blocked and affecting the passage of flue gas.

[0023] A pH detector 10 is fixedly installed on one side of the upper end of the heat exchange box 1, and the detection end of the pH detector 10 is arranged at the bottom of the flue gas treatment chamber; when working, when the waste heat utilization device is used, the harmful gas in the flue gas reacts with the alkali solution, the alkali solution is neutralized, and the detection value on the pH detector 10 decreases.

[0024] A storage tank 3 is provided on one side of the top of the heat exchange box 1, and the storage tank 3 is fixedly connected to the heat exchange box 1 through a feed pipe 4, and a flow control valve 5 is provided in the feed pipe 4; during operation, when the waste heat utilization device is used, when the alkali solution reacts with the flue gas, the pH value detector 10 shows that the pH value decreases, and the flow control valve 5 is opened to feed the alkaline agent in the storage tank 3 into the heat exchange box 1 through the feed pipe 4 to mix with the alkali solution and increase the pH value of the alkali solution.

[0025] A stirring motor 6 is fixedly installed on one side of the upper end of the heat exchange box 1, and a stirring shaft 7 is arranged on the upper part of the flue gas treatment chamber. Both ends of the stirring shaft 7 are rotatably installed in the heat exchange box 1 through bearings. A plurality of stirring rods 8 are installed in an array on the stirring shaft 7, and the front end of the rotating shaft of the stirring motor 6 is fixedly connected to one end of the stirring shaft 7. During operation, when the waste heat utilization device is used, the stirring motor 6 is started, the stirring motor 6 drives the stirring shaft 7 to rotate, and the stirring shaft 7 drives the stirring rod 8 to rotate, so as to mix the alkaline agent and the alkali solution, and accelerate the reaction of the flue gas and the alkali solution.

[0026] A screw rod 18 is vertically arranged below the scraper 19, and the slider 17 is slidably installed on the screw rod 18. Both ends of the screw rod 18 are rotatably installed in the heat exchange box 1 through bearings. A drive motor 23 is fixedly installed on one side of the lower end of the heat exchange box 1, and the rotating shaft of the drive motor 23 is fixedly connected to one end of the screw rod 18. During operation, when the waste heat utilization device is used, the drive motor 23 is started, the drive motor 23 drives the screw rod 18 to rotate, the screw rod 18 drives the slider 17 to move, and the slider 17 drives the scraper 19 to clean the bottom of the filter plate 16.

[0027] A hopper is fixedly installed at the bottom of the heat exchange box 1, and an ash discharge pipe is fixedly installed at the bottom of the hopper. A sliding hole is opened on one side of the ash discharge pipe, and a sealing plate 22 is slidably installed in the sliding hole. During operation, when the waste heat utilization device is used, when heat exchange is performed, the sealing plate 22 is closed to make the bottom of the heat exchange box 1 sealed. After the heat exchange is completed, the sealing plate 22 is opened to discharge the dust in the hopper out of the heat exchange box 1 through the ash discharge pipe.

[0028] Working principle: It is found in the use of the existing gas boiler flue gas waste heat utilization device that the flue gas after the gas combustion contains a large amount of dust particles. The dust in the flue gas contains corrosive components and adheres to the inner wall of the heat exchange device pipe for a long time, which may corrode the pipe wall and shorten the service life of the equipment. When using the waste heat utilization device, the flue gas enters the flue gas dust removal chamber through the air inlet pipe 21, passes through the filter plate 16 to filter the dust therein, and then enters the heat exchanger 14 through the air inlet end of the heat exchanger 14, and injects heat exchange liquid into the heat exchange chamber through the water inlet pipe 15. The heat exchange liquid exchanges heat with the flue gas in the pipe through the heat exchange plate. The heat exchange liquid absorbs heat and the temperature rises. The heat exchange liquid passes through the outlet pipe 1 3 is discharged, the flue gas enters the connecting pipe 11 through the outlet end of the heat exchanger 14, and then enters the air distribution pipe 9. At this time, the one-way valve 12 prevents the alkali solution from flowing back into the heat exchanger 14, and is discharged into the alkali solution in the flue gas treatment chamber through the air holes on the air distribution pipe 9 to react with the alkali solution. The treated gas is discharged from the heat exchange box 1 through the exhaust pipe 2. During the filtering process of the filter plate 16, the dust will adhere to the bottom of the filter plate 16. The slider 17 drives the scraper 19 to slide in the slide rail 20 to clean the bottom plane of the filter plate 16 to prevent the filter plate 16 from being blocked and affecting the passage of the flue gas. After the heat exchange is completed, the sealing plate 22 is opened to discharge the dust in the hopper through the ash discharge pipe to the heat exchange box 1.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0030] 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, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A gas boiler flue gas waste heat utilization device, characterized in that: The invention comprises a heat exchange box (1); the heat exchange box (1) is divided into three chambers: a flue gas treatment chamber, a heat exchange chamber, and a flue gas dust removal chamber; the flue gas dust removal chamber is arranged at the bottom of the heat exchange box (1); an air inlet hole is opened on one side of the flue gas dust removal chamber; an air inlet pipe (21) is fixedly installed on the air inlet hole; a filter plate (16) is fixedly installed on the upper part of the flue gas dust removal chamber; slide rails (20) are arranged on both sides below the filter plate (16); a scraper (19) is slidably arranged in the slide rail (20); a slider (17) is fixedly connected to the bottom of the scraper (19); a threaded hole is opened in the slider (17); a heat exchanger (14) is fixedly installed in the heat exchange chamber; The air inlet end of the heat exchanger (14) is fixedly connected to the top plate of the flue gas dust removal chamber, and the air outlet end is fixedly connected to the inner wall of one side of the heat exchange chamber. A water inlet pipe (15) is fixedly connected to the lower end cavity of one side of the heat exchange chamber, and a water outlet pipe (13) is fixedly connected to the upper end cavity of the other side. An air distribution pipe (9) is fixedly arranged at the lower part of the flue gas treatment chamber, and the air inlet end of the air distribution pipe (9) is fixedly connected to the inner wall of the flue gas treatment chamber. The air outlet end of the heat exchanger (14) and the air inlet end of the air distribution pipe (9) are fixedly connected via a connecting pipe (11), and a one-way valve (12) is arranged in the connecting pipe (11). An exhaust pipe (2) is fixedly connected to one side of the top of the heat exchange box (1).

2. A gas boiler flue gas waste heat utilization device according to claim 1, characterized in that: A pH value detector (10) is fixedly mounted on one side of the upper end of the heat exchange box (1), and a detection end of the pH value detector (10) is arranged at the bottom of the flue gas treatment chamber.

3. A gas boiler flue gas waste heat utilization device according to claim 1, characterized in that: A material storage tank (3) is provided on one side of the top of the heat exchange box (1); the material storage tank (3) and the heat exchange box (1) are fixedly connected via a feed pipe (4); a flow control valve (5) is provided in the feed pipe (4).

4. A gas boiler flue gas waste heat utilization device according to claim 1, characterized in that: A stirring motor (6) is fixedly mounted on one side of the upper end of the heat exchange box (1); a stirring shaft (7) is arranged at the upper part of the flue gas treatment chamber; both ends of the stirring shaft (7) are rotatably mounted in the heat exchange box (1) via bearings; a plurality of stirring rods (8) are mounted in an array on the stirring shaft (7); and the front end of the rotating shaft of the stirring motor (6) is fixedly connected to one end of the stirring shaft (7).

5. The gas boiler flue gas waste heat utilization device according to claim 1, characterized in that: A screw rod (18) is vertically arranged below the scraper (19), the slider (17) is slidably mounted on the screw rod (18), both ends of the screw rod (18) are rotatably mounted in the heat exchange box (1) via bearings, a drive motor (23) is fixedly mounted on one side of the lower end of the heat exchange box (1), and the rotating shaft of the drive motor (23) is fixedly connected to one end of the screw rod (18).

6. A gas boiler flue gas waste heat utilization device according to claim 1, characterized in that: A hopper is fixedly installed at the bottom of the heat exchange box (1), and an ash discharge pipe is fixedly installed at the bottom of the hopper. A sliding hole is opened on one side of the ash discharge pipe, and a sealing plate (22) is slidably installed in the sliding hole.

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