Flue tail gas waste heat recovery device of steam boiler

Abstract

The utility model relates to the technical field of waste heat recovery devices, in particular to a flue tail gas waste heat recovery device of a steam boiler, which is convenient for cleaning dust on the outer wall of a heat exchange tube and improving the waste heat recovery effect and comprises waste heat recovery equipment, and a heat exchange cavity is arranged in the waste heat recovery equipment and between two baffles. A plurality of heat exchange pipes are arranged between the two baffles, an air inlet cavity is formed in one side of the interior of the waste heat recovery equipment, an air exhaust cavity is formed in the other side of the interior of the waste heat recovery equipment, an air inlet pipe is arranged on one side of the waste heat recovery equipment, an air exhaust pipe is arranged on the other side of the waste heat recovery equipment, and a smoke inlet pipe is arranged at the top of the waste heat recovery equipment. A smoke exhaust pipe is arranged on the front portion of the bottom of the waste heat recovery equipment, an ash discharging device is arranged at the bottom end of the waste heat recovery equipment, a pulse blowing device is arranged on the top of the waste heat recovery equipment, the ash discharging device comprises an ash hopper, a discharging pipe, a control valve and a dust collecting bag, and the pulse blowing device comprises an air bag, an air pump, a connecting pipe and a blowing pipe.

Description

Technical Field

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

[0002] As we all know, when the boiler is in operation, the exhaust gas discharged from the flue will contain waste heat. Waste heat is the energy that is not utilized in the energy utilization equipment under certain economic and technical conditions, that is, excess and waste energy. Waste heat recovery is an important way to improve economy and save fuel. Waste heat recovery device mainly recycles waste heat.

[0003] The existing waste heat recovery device has certain defects. There are a large number of heat exchange tubes inside the existing waste heat recovery device, and there is a large amount of dust in the flue gas. When the dust in the flue gas adheres to the outer wall of the heat exchange tube, it will seriously affect the heat exchange effect of the waste heat recovery device, causing partial heat loss, and it is not easy to clean, which brings inconvenience to use. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a flue gas waste heat recovery device for a steam boiler, which is convenient for cleaning dust on the outer wall of a heat exchange tube and improves the waste heat recovery effect.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a waste heat recovery device for flue tail gas of a steam boiler, comprising a waste heat recovery device, baffles are arranged on both sides of the waste heat recovery device, a heat exchange cavity is arranged inside the waste heat recovery device and between the two baffles, a plurality of heat exchange tubes are arranged between the two baffles, an air inlet cavity is arranged on one side of the waste heat recovery device, an air exhaust cavity is arranged on the other side of the waste heat recovery device, an air inlet pipe is arranged on one side of the waste heat recovery device, an air exhaust pipe is arranged on the other side of the waste heat recovery device, a smoke inlet pipe is arranged on the top of the waste heat recovery device, a smoke exhaust pipe is arranged on the front of the bottom of the waste heat recovery device, an ash discharge device is arranged at the bottom of the waste heat recovery device, and a pulse blowing device is arranged on the top of the waste heat recovery device;

[0008] The ash discharge device includes an ash hopper, a discharge pipe, a control valve and a dust bag. The ash hopper is installed at the bottom end of the waste heat recovery equipment, the discharge pipe is installed at the bottom end of the ash hopper, the control valve is arranged on the discharge pipe, and the dust bag is installed at the bottom of the discharge pipe;

[0009] The pulse blowing device includes an air bag, an air pump, a connecting pipe and a blowing pipe. Several blowing pipes are provided, and the several blowing pipes are installed on the top of the waste heat recovery equipment. The connecting pipe is connected to each blowing pipe. A first air guide pipe is provided between the air bag and the connecting pipe, and an electromagnetic pulse valve is provided on the first air guide pipe. A second air guide pipe is provided between the air bag and the air pump, and a one-way valve is provided on the second air guide pipe.

[0010] Furthermore, the smoke inlet pipe and the smoke exhaust pipe are both connected to the heat exchange chamber.

[0011] Furthermore, both ends of each heat exchange tube pass through the baffle, one end of each heat exchange tube is connected to the air inlet cavity, and the other end of each heat exchange tube is connected to the air exhaust cavity.

[0012] Furthermore, the air inlet pipe is communicated with the air inlet cavity.

[0013] Furthermore, the exhaust pipe is communicated with the exhaust cavity.

[0014] Furthermore, the bottoms of the plurality of blowing pipes are installed inside the heat exchange cavity.

[0015] Furthermore, the ash hopper is communicated with the heat exchange chamber.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the utility model provides a flue gas waste heat recovery device for a steam boiler, which has the following beneficial effects:

[0018] The flue exhaust waste heat recovery device of the steam boiler is equipped with a pulse blowing device and an ash discharge device. The electromagnetic pulse valve controls the high-pressure gas in the air bag to be pulse-sprayed into the interior of the heat exchange chamber through the injection pipe. The high-pressure gas pulsed into the heat exchange chamber cleans the dust on the heat exchange tube. The cleaned dust falls into the ash hopper and finally enters the dust collecting bag, thereby facilitating the cleaning and recovery of the dust on the heat exchange tube. After the dust on the heat exchange tube is cleaned, the waste heat recovery effect can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0020] Figure 2 This is a front view structural schematic diagram of the utility model;

[0021] Figure 3 It is a cross-sectional structural schematic diagram of the utility model.

[0022] In the figure: 1. Waste heat recovery equipment; 2. Baffle; 3. Heat exchange chamber; 4. Air inlet chamber; 5. Exhaust chamber; 6. Air inlet pipe; 7. Exhaust pipe; 8. Smoke inlet pipe; 9. Smoke exhaust pipe; 10. Discharge pipe; 11. Control valve; 12. Dust bag; 13. Air bag; 14. First air duct; 15. Connecting pipe; 16. Blowing pipe; 17. Solenoid pulse valve; 18. Second air duct; 19. Air pump; 20. One-way valve; 21. Ash hopper; 22. Heat exchange pipe. DETAILED DESCRIPTION

[0023] 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.

[0024] See also Figure 1-3 The utility model discloses a waste heat recovery device for flue gas of a steam boiler, comprising a waste heat recovery device 1, baffles 2 are arranged on both sides of the waste heat recovery device 1, a heat exchange chamber 3 is arranged inside the waste heat recovery device 1 and between the two baffles 2, a plurality of heat exchange tubes 22 are arranged between the two baffles 2, both ends of each heat exchange tube 22 pass through the baffle 2, one end of each heat exchange tube 22 is connected to an air inlet chamber 4, and the other end of each heat exchange tube 22 is connected to an exhaust chamber 5, and an air inlet chamber 4 is arranged on one side of the waste heat recovery device 1. An exhaust chamber 5 is provided on the other side of the waste heat recovery device 1, an air inlet pipe 6 is provided on one side of the waste heat recovery device 1, and the air inlet pipe 6 is connected to the air inlet chamber 4, an exhaust pipe 7 is provided on the other side of the waste heat recovery device 1, and the exhaust pipe 7 is connected to the exhaust chamber 5, a smoke inlet pipe 8 is provided on the top of the waste heat recovery device 1, and a smoke exhaust pipe 9 is provided on the front of the bottom of the waste heat recovery device 1, and the smoke inlet pipe 8 and the smoke exhaust pipe 9 are both connected to the heat exchange chamber 3, an ash discharge device is provided at the bottom end of the waste heat recovery device 1, and a pulse blowing device is provided on the top of the waste heat recovery device 1;

[0025] The ash discharge device includes an ash hopper 21, a discharge pipe 10, a control valve 11 and a dust bag 12. The ash hopper 21 is installed at the bottom end of the waste heat recovery device 1. The ash hopper 21 is connected to the heat exchange chamber 3. The discharge pipe 10 is installed at the bottom end of the ash hopper 21. The control valve 11 is arranged on the discharge pipe 10. The dust bag 12 is installed at the bottom of the discharge pipe 10. The control valve 11 controls the conduction and closing of the discharge pipe 10. The cleaned dust falls into the ash hopper 21 and finally enters the interior of the dust bag 12.

[0026] The pulse blowing device includes an air bag 13, an air pump 19, a connecting pipe 15 and a blowing pipe 16. Several blowing pipes 16 are arranged, and several blowing pipes 16 are installed on the top of the waste heat recovery equipment 1. The bottoms of several blowing pipes 16 are installed inside the heat exchange chamber 3. The connecting pipe 15 is connected to each blowing pipe 16. A first air guide pipe 14 is arranged between the air bag 13 and the connecting pipe 15. An electromagnetic pulse valve 17 is arranged on the first air guide pipe 14. A second air guide pipe 18 is arranged between the air bag 13 and the air pump 19. A one-way valve 20 is arranged on the second air guide pipe 18 to prevent the gas inside the air bag 13 from flowing toward the air pump 19. The air bag 13 plays the role of storing high-pressure gas. The air pump 19 provides gas to the inside of the air bag 13. The electromagnetic pulse valve 17 controls the high-pressure gas in the air bag 13 to be pulse-sprayed into the inside of the heat exchange chamber 3 through the blowing pipe 16. The high-pressure gas pulsed into the inside of the heat exchange chamber 3 cleans the dust on the heat exchange pipe 22.

[0027] To summarize, when the flue gas waste heat recovery device of the steam boiler is in use, the flue gas enters the interior of the heat exchange chamber 3 through the smoke inlet pipe 8, and then the smoke in the heat exchange chamber 3 is discharged through the smoke exhaust pipe 9. The unheated gas enters the interior of the air inlet chamber 4 through the air inlet pipe 6, and then enters the interior of the heat exchange tube 22, and then enters the interior of the exhaust chamber 5, and is finally discharged through the exhaust pipe 7. The heat of the flue gas is used to heat the air through the heat exchange tube 22, and the heated air is recovered and utilized. When the heat exchange tube 22 is cleaned, the electromagnetic pulse valve 17 is used to control the high-pressure gas in the air bag 13 to be pulse-sprayed into the interior of the heat exchange chamber 3 through the injection pipe 16. The high-pressure gas that pulses into the interior of the heat exchange chamber 3 cleans the dust on the heat exchange tube 22, and the cleaned dust falls into the ash hopper 21 and finally enters the interior of the dust collecting bag 12.

[0028] Although the 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 flue gas waste heat recovery device for a steam boiler, comprising a waste heat recovery device (1), characterized in that: Baffles (2) are provided on both sides of the waste heat recovery device (1), a heat exchange chamber (3) is provided inside the waste heat recovery device (1) and between the two baffles (2), a plurality of heat exchange tubes (22) are provided between the two baffles (2), an air inlet chamber (4) is provided on one side of the waste heat recovery device (1), an air exhaust chamber (5) is provided on the other side of the waste heat recovery device (1), an air inlet pipe (6) is provided on one side of the waste heat recovery device (1), an air exhaust pipe (7) is provided on the other side of the waste heat recovery device (1), a smoke inlet pipe (8) is provided on the top of the waste heat recovery device (1), a smoke exhaust pipe (9) is provided at the front of the bottom of the waste heat recovery device (1), an ash discharge device is provided at the bottom end of the waste heat recovery device (1), and a pulse blowing device is provided on the top of the waste heat recovery device (1); The ash discharge device comprises an ash hopper (21), a discharge pipe (10), a control valve (11) and a dust bag (12); the ash hopper (21) is installed at the bottom end of the waste heat recovery device (1); the discharge pipe (10) is installed at the bottom end of the ash hopper (21); the control valve (11) is arranged on the discharge pipe (10); and the dust bag (12) is installed at the bottom of the discharge pipe (10); The pulse air blowing device comprises an air bag (13), an air pump (19), a connecting pipe (15) and a blowing pipe (16); the blowing pipe (16) is arranged in plurality, and the plurality of blowing pipes (16) are installed on the top of the waste heat recovery device (1); the connecting pipe (15) is connected to each blowing pipe (16); a first air guide pipe (14) is arranged between the air bag (13) and the connecting pipe (15); an electromagnetic pulse valve (17) is arranged on the first air guide pipe (14); a second air guide pipe (18) is arranged between the air bag (13) and the air pump (19); a one-way valve (20) is arranged on the second air guide pipe (18).

2. The device for recovering waste heat from flue gas of a steam boiler according to claim 1, characterized in that: The smoke inlet pipe (8) and the smoke exhaust pipe (9) are both connected to the heat exchange chamber (3).

3. The device for recovering waste heat from flue gas of a steam boiler according to claim 1, characterized in that: Both ends of each heat exchange tube (22) pass through the baffle (2), one end of each heat exchange tube (22) is connected to the air inlet chamber (4), and the other end of each heat exchange tube (22) is connected to the air exhaust chamber (5).

4. The device for recovering waste heat from flue gas of a steam boiler according to claim 1, characterized in that: The air inlet pipe (6) is in communication with the air inlet chamber (4).

5. The device for recovering waste heat from flue gas of a steam boiler according to claim 1, characterized in that: The exhaust pipe (7) is communicated with the exhaust chamber (5).

6. The device for recovering waste heat from flue gas of a steam boiler according to claim 1, characterized in that: The bottoms of the plurality of blowing pipes (16) are all installed inside the heat exchange chamber (3).

7. The device for recovering waste heat from flue gas of a steam boiler according to claim 1, characterized in that: The ash hopper (21) is in communication with the heat exchange chamber (3).

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