Multi-stage heat exchange device with flue gas waste heat utilization function

Abstract

The invention discloses a multi-stage heat exchange device, and particularly relates to a multi-stage heat exchange device with a flue gas waste heat utilization function, the multi-stage heat exchange device comprises a first heat exchange box and a second heat exchange box, the first heat exchange box and the second heat exchange box are both internally provided with a plurality of heat dissipation pipes penetrating through the first heat exchange box and the second heat exchange box; a first box body is arranged on one side of the first heat exchange box, a second box body is arranged on one side of the second heat exchange box, the heat dissipation pipe is communicated with the first box body and the second box body, and a connecting pipe for clean air to pass through is connected between the first heat exchange box and the second heat exchange box. The first heat exchange box and the second heat exchange box are arranged, so that heat of flue gas is recycled in a multi-stage mode when passing through the two heat exchange boxes, and the waste heat utilization efficiency is remarkably improved. In the process that clean air enters the first heat exchange box and the second heat exchange box, the clean air is subjected to two-stage preheating, and the higher temperature is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange equipment, and in particular to a multi-stage heat exchange device with a flue gas waste heat utilization function. Background Art

[0002] With the development of industry, boilers are widely used in the fields of electricity, chemical industry, metallurgy, etc. as an important thermal energy equipment. During the operation of the boiler, flue gas is a high-temperature exhaust gas generated by the combustion of fuel, which usually has a high amount of waste heat. If it is not recovered, this part of the waste heat will be discharged with the flue gas, causing a large amount of energy loss. Therefore, how to effectively recover the waste heat in the flue gas and reduce the heat loss of the boiler has become the key to improving the overall energy efficiency of the boiler and reducing energy consumption. In the prior art, heat exchangers are often used to recover the waste heat of flue gas, and the heat in the flue gas is transferred to water or air, thereby reducing the exhaust temperature and improving energy utilization. However, since the flue gas often contains dust and impurities, these impurities will adhere to and accumulate on the inner wall of the heat exchange tube, causing scaling and clogging of the inner wall of the heat exchange tube, seriously affecting the heat exchange efficiency. Traditional waste heat recovery systems mostly rely on manual or shutdown cleaning methods, which not only increases maintenance costs, but also has low cleaning efficiency and is difficult to meet actual production needs. Summary of the invention

[0003] In order to solve the above problems in the prior art, the present invention provides a multi-stage heat exchange device with flue gas waste heat utilization function to solve the current technical problems.

[0004] The technical solution adopted by the present invention to solve its technical problem is: The present invention provides a multi-stage heat exchange device with a flue gas waste heat utilization function, comprising: a first heat exchange box and a second heat exchange box, wherein the first heat exchange box and the second heat exchange box are both provided with a plurality of heat dissipation pipes penetrating the first heat exchange box and the second heat exchange box, a first box body is provided on one side of the first heat exchange box, and a second box body is provided on one side of the second heat exchange box, the heat dissipation pipes connect the first box body and the second box body, and a connecting pipe for passing clean air is connected between the first heat exchange box and the second heat exchange box.

[0005] Preferably, a plurality of first rotating shafts are arranged in the first box body, a plurality of first wire reels are arranged on the first rotating shafts, the first wire reels are fixed on the first rotating shafts, and steel wire ropes are wound around the first wire reels.

[0006] Preferably, a first gear is provided on the first rotating shaft, and adjacent first gears are meshed with each other, and one of the first gears is meshed with a third gear, and the third gear is connected to the third rotating shaft, and a torsion spring is sleeved on the third rotating shaft for preventing the third gear from rotating.

[0007] Preferably, a plurality of second rotating shafts are provided in the second box body, a plurality of second wire reels are provided on the second rotating shafts, the second wire reels are fixed on the second rotating shafts, and the other end of the steel wire rope is wound around the second wire reels.

[0008] Preferably, the second rotating shaft is provided with a second gear, and adjacent second gears are meshed with each other, wherein one of the second gears is meshed with a fourth gear, and the fourth gear is connected to the main shaft of the motor.

[0009] Preferably, the steel wire rope passes through the heat exchange tube, and a cleaning block is fixed on the steel wire rope. When the motor rotates forward, it will drive the second winding drum to move and then drive the steel wire rope to move. The cleaning block will pass through the heat exchange tube to clean the inner wall of the heat exchange tube. When the motor reverses, the torsion spring will drive the third gear to reset, and then drive the first winding drum to reverse, drive the cleaning block to move in the opposite direction, and continue to clean the inner wall of the heat exchange tube.

[0010] Preferably, the first box is connected to a smoke inlet, the second box is connected to a smoke outlet, the first heat exchange box is connected to a clean air outlet, and the second heat exchange box is connected to a clean air inlet.

[0011] The beneficial effects of the present invention are: Improve waste heat recovery efficiency: The present invention sets up a first heat exchange box and a second heat exchange box, so that the heat of the flue gas is recovered and utilized in multiple stages when passing through the two heat exchange boxes, thereby significantly improving the waste heat utilization efficiency. When the clean air enters the first heat exchange box and the second heat exchange box, it is preheated in two stages to reach a higher temperature, which helps to maximize the waste heat recovery in the flue gas.

[0012] Improve heat exchange efficiency: By setting a heat pipe running through the heat exchange box and arranging a wire rope cleaning device in the heat exchange pipe, the inner wall of the heat exchange pipe can be effectively cleaned, reducing the thermal resistance caused by dust accumulation or impurities, thereby significantly improving the heat exchange efficiency and reducing the heat loss of boiler flue gas.

[0013] Realize automatic cleaning: By using the first and second winding reels set in the first and second boxes and the forward and reverse operation of the motor and the torsion spring, the reciprocating motion of the wire rope can be realized, thereby driving the cleaning block to automatically clean the heat exchange tube. This structure avoids the tediousness of manual cleaning and improves the automation level of the equipment.

[0014] Reduce energy consumption and maintenance costs: The automatic cleaning device repeatedly cleans the inner wall of the heat exchange tube to maintain cleanliness, reducing the increase in thermal resistance caused by flue gas ash accumulation, which not only improves the heat exchange efficiency but also reduces the energy consumption of the boiler. At the same time, the frequency of equipment maintenance is reduced, thereby reducing maintenance costs and labor costs.

[0015] Simple structure and high reliability: The waste heat recovery heat exchanger has a compact design structure, the winding reel, rotating shaft and gear transmission device are simple and efficient, and a torsion spring is provided for resetting, making the device highly reliable and durable.

[0016] Improve emission quality: By recovering waste heat from flue gas, the loss of heat energy and the emission of harmful substances are reduced, the overall emission quality of the boiler is improved, and it helps to reduce environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 2 is a schematic structural diagram of a multi-stage heat exchange device with flue gas waste heat utilization function according to an embodiment of the present invention; Figure 2 2 is a schematic structural diagram of a multi-stage heat exchange device with flue gas waste heat utilization function according to an embodiment of the present invention; Figure 3 2 is a schematic structural diagram of a multi-stage heat exchange device with flue gas waste heat utilization function according to an embodiment of the present invention; Figure 4 2 is a schematic structural diagram of a multi-stage heat exchange device with flue gas waste heat utilization function according to an embodiment of the present invention; Figure 5 2 is a schematic structural diagram of a multi-stage heat exchange device with flue gas waste heat utilization function according to an embodiment of the present invention; Figure 6 It is a schematic structural diagram of a multi-stage heat exchange device with flue gas waste heat utilization function according to an embodiment of the present invention. Description of Reference Numerals

[0018] exist Figure 1-Figure 6 In the figure, the first box body 1; the first rotating shaft 2; the first winding drum 3; the wire rope 4; the cleaning block 5; the heat exchange tube 6; the first heat exchange box 7; the connecting pipe 8; the second heat exchange box 9; the clean air inlet 10; the smoke outlet 11; the second box body 12; the second winding drum 13; the second rotating shaft 14; the baffle 15; the clean air outlet 16; the smoke inlet 17; the first gear 18; the third gear 19; the fourth gear 20; the second gear 21. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The present invention provides a multi-stage heat exchange device with flue gas waste heat utilization function, including: a first heat exchange box 7 and a second heat exchange box 9, the first heat exchange box 7 and the second heat exchange box 9 are both provided with a plurality of heat dissipation pipes penetrating the first heat exchange box 7 and the second heat exchange box 9, a first box body 1 is provided on one side of the first heat exchange box 7, a second box body 12 is provided on one side of the second heat exchange box 9, the heat dissipation pipes connect the first box body 1 and the second box body 12, and a connecting pipe 8 for passing clean air is connected between the first heat exchange box 7 and the second heat exchange box 9. The first heat exchange box 7, the second heat exchange box 9, the first box body 1 and the second box body 12 are all metal boxes, the heat exchange pipe 6 is a copper pipe, and the connecting pipe 8 is a stainless steel metal pipe, which is used to increase the connection strength between the first heat dissipation box and the second heat dissipation box.

[0021] A plurality of first rotating shafts 2 are arranged in the first housing 1, and a plurality of first wire reels 3 are arranged on the first rotating shafts 2. The first wire reels 3 are fixed on the first rotating shafts 2, and a steel wire rope 4 is wound on the first wire reels 3. A first gear 18 is arranged on the first rotating shaft 2, and adjacent first gears 18 are meshed with each other, one of the first gears 18 is meshed with a third gear 19, and the third gear 19 is connected to the third rotating shaft, and a torsion spring for preventing the third gear 19 from rotating is sleeved on the third rotating shaft. The first rotating shaft 2, the second rotating shaft 14 and the third rotating shaft are all metal rotating shafts, the first wire reel 3 and the second wire reel 13 are all metal wire reels, and the first gear 18, the second gear 21, the third gear 19 and the fourth gear 20 are all metal gears.

[0022] A plurality of second rotating shafts 14 are disposed in the second box body 12 , a plurality of second wire reels 13 are disposed on the second rotating shafts 14 , the second wire reels 13 are fixed on the second rotating shafts 14 , and the other end of the steel wire rope 4 is wound around the second wire reels 13 .

[0023] The second rotating shaft 14 is provided with a second gear 21 , and adjacent second gears 21 are meshed with each other, wherein one of the second gears 21 is meshed with a fourth gear 20 , and the fourth gear 20 is connected to the main shaft of the motor.

[0024] The steel wire rope 4 passes through the heat exchange tube 6, and a cleaning block 5 is fixed on the steel wire rope 4. The cleaning block 5 is a rubber block. When the motor rotates forward, it will drive the second winding drum 13 to move and then drive the steel wire rope 4 to move. The cleaning block 5 will pass through the heat exchange tube 6 to clean the inner wall of the heat exchange tube 6. When the motor reverses, the torsion spring will drive the third gear 19 to reset, and then drive the first winding drum 3 to reverse, drive the cleaning block 5 to move in the opposite direction, and continue to clean the inner wall of the heat exchange tube 6.

[0025] The first box 1 is connected to a smoke inlet 17, the second box 12 is connected to a smoke outlet 11, the first heat exchange box 7 is connected to a clean air outlet 16, and the second heat exchange box 9 is connected to a clean air inlet 10. Metal baffles 15 are provided in both the first heat exchange box 7 and the second heat exchange box 9.

[0026] The present invention is provided with a first heat exchange box 7 and a second heat exchange box 9, so that the heat of the flue gas is recovered and utilized in multiple stages when passing through the two heat exchange boxes, thereby significantly improving the efficiency of waste heat utilization. When the clean air enters the first heat exchange box 7 and the second heat exchange box 9, it is preheated in two stages to reach a higher temperature, which helps to maximize the recovery of waste heat in the flue gas.

[0027] By setting a heat exchanger box with a heat dissipation pipe running through it and arranging a wire rope 4 cleaning device in the heat exchanger box, the inner wall of the heat exchanger tube 6 can be effectively cleaned, reducing the thermal resistance caused by dust accumulation or impurities, thereby significantly improving the heat exchange efficiency and reducing the heat loss of boiler flue gas.

[0028] By utilizing the first and second winding reels 3 and 13 disposed in the first and second boxes 1 and 12 and the forward and reverse rotation of the motor and the torsion spring, the reciprocating motion of the wire rope 4 can be realized, thereby driving the cleaning block 5 to automatically clean the heat exchange tube 6. This structure avoids the tediousness of manual cleaning and improves the automation level of the equipment.

[0029] Through repeated cleaning by the automatic cleaning device, the cleanliness of the inner wall of the heat exchange tube 6 is maintained, and the increase in thermal resistance caused by flue gas ash accumulation is reduced, which not only improves the heat exchange efficiency, but also reduces the energy consumption of the boiler. At the same time, the frequency of equipment maintenance is reduced, thereby reducing maintenance costs and labor costs.

[0030] The waste heat recovery heat exchanger has a compact design structure, a simple and efficient winding drum, a rotating shaft and a gear transmission device, and a torsion spring is provided for resetting, so that the device has high reliability and durability.

[0031] By recovering the waste heat from flue gas, the loss of heat energy and the emission of harmful substances are reduced, the overall emission quality of the boiler is improved, and it helps to reduce environmental pollution.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-stage heat exchange device with flue gas waste heat utilization function, comprising: The first heat exchange box and the second heat exchange box are characterized in that: a plurality of heat dissipation pipes penetrating the first heat exchange box and the second heat exchange box are arranged inside the first heat exchange box and the second heat exchange box, a first box body is arranged on one side of the first heat exchange box, and a second box body is arranged on one side of the second heat exchange box, the heat dissipation pipes connect the first box body and the second box body, and a connecting pipe for passing clean air is connected between the first heat exchange box and the second heat exchange box.

2. The multi-stage heat exchange device with flue gas waste heat utilization function according to claim 1 is characterized in that: A plurality of first rotating shafts are arranged in the first box body, a plurality of first wire reels are arranged on the first rotating shafts, the first wire reels are fixed on the first rotating shafts, and steel wire ropes are wound on the first wire reels.

3. The multi-stage heat exchange device with flue gas waste heat utilization function according to claim 2 is characterized in that: The first rotating shaft is provided with a first gear, and adjacent first gears are meshed with each other, and one of the first gears is meshed with a third gear, and the third gear is connected to the third rotating shaft, and the third rotating shaft is sleeved with a torsion spring for preventing the third gear from rotating.

4. The multi-stage heat exchange device with flue gas waste heat utilization function according to claim 2 is characterized in that: A plurality of second rotating shafts are arranged in the second box body, a plurality of second wire reels are arranged on the second rotating shafts, the second wire reels are fixed on the second rotating shafts, and the other end of the steel wire rope is wound on the second wire reels.

5. The multi-stage heat exchange device with flue gas waste heat utilization function according to claim 4 is characterized in that: The second rotating shaft is provided with a second gear, and adjacent second gears are meshed with each other, wherein one of the second gears is meshed with a fourth gear, and the fourth gear is connected to the main shaft of the motor.

6. The multi-stage heat exchange device with flue gas waste heat utilization function according to claim 2, characterized in that: A cleaning block is fixed on the steel wire rope.

7. The multi-stage heat exchange device with flue gas waste heat utilization function according to claim 1, characterized in that: The first box is connected to a smoke inlet, the second box is connected to a smoke outlet, the first heat exchange box is connected to a clean air outlet, and the second heat exchange box is connected to a clean air inlet.

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