CN111237801A - Self-cleaning air preheater - Google Patents
Self-cleaning air preheater Download PDFInfo
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- CN111237801A CN111237801A CN202010168544.4A CN202010168544A CN111237801A CN 111237801 A CN111237801 A CN 111237801A CN 202010168544 A CN202010168544 A CN 202010168544A CN 111237801 A CN111237801 A CN 111237801A
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- Prior art keywords
- heat exchange
- exchange tube
- air
- flue gas
- driving plate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
- F28D7/1607—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation with particular pattern of flow of the heat exchange media, e.g. change of flow direction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/08—Non-rotary, e.g. reciprocated, appliances having scrapers, hammers, or cutters, e.g. rigidly mounted
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Supply (AREA)
Abstract
The invention relates to the field of heat exchangers, and particularly discloses a self-cleaning air preheater, wherein a flue gas inlet is formed in the top end of a heat exchange chamber, a flue gas exhaust port is formed in the bottom end of the heat exchange chamber, a plurality of heat exchange tubes are arranged in the heat exchange chamber in the horizontal direction, partition plates are arranged at two ends of each heat exchange tube, holes corresponding to the number of the heat exchange tubes are formed in the partition plates, each heat exchange tube comprises an upper heat exchange tube and a lower heat exchange tube, an air inlet is formed in one end of the lower heat exchange tube, an air exhaust port is formed in the same end of the upper heat exchange tube, an air transfer chamber is formed in the other ends of the lower heat exchange tube. The invention achieves the purpose of strengthening heat transfer by increasing the heat transfer coefficient and the heat transfer temperature difference, and the dust removing device is arranged on the heat exchanger, thereby reducing the dust accumulation phenomenon of the heat exchange tube and further improving the heat exchange efficiency of the air preheater.
Description
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a self-cleaning air preheater.
Background
The air preheaters are various in types, and comprise a rotary air preheater, a plate type air preheater, a shell-and-tube type air preheater and the like, wherein the shell-and-tube type air preheater is perfect in theoretical research and design technology, good in application reliability and most widely applied. Common shell and tube air heater utilizes the high temperature flue gas that produces in the industrial production to carry out the heat energy replacement with the air, and then retrieves the flue gas waste heat effectively, reaches the energy and recycles the purpose, but traditional shell and tube air heater's heat exchange efficiency is not high, and heat utilization is rateed lowly, and waste heat recovery effect is general.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a self-cleaning air preheater, which effectively improves the heat exchange efficiency of a shell-and-tube air preheater by skillfully arranging the structure of an air channel and a flue gas channel and arranging an automatic ash removal device.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a self-cleaning type air preheater comprises a heat exchange chamber, wherein a flue gas inlet is formed in the top end of the heat exchange chamber, a flue gas outlet is formed in the bottom end of the heat exchange chamber, and a high-temperature flue gas channel is formed by the flue gas inlet, the heat exchange chamber and the flue gas outlet; the heat exchange tube comprises a heat exchange chamber, a plurality of heat exchange tubes are arranged in the heat exchange chamber in the horizontal direction, partition plates are arranged at two ends of each heat exchange tube, holes corresponding to the heat exchange tubes in number are formed in the partition plates, each heat exchange tube comprises an upper heat exchange tube and a lower heat exchange tube, an air inlet is formed in one end of each lower heat exchange tube, an air exhaust port is formed in the same end of each upper heat exchange tube, the lower heat exchange tube and the other end of each upper heat exchange tube are provided with an air transfer chamber, and the air inlet, the lower heat exchange tubes, the air transfer chamber.
Further, the heat transfer room is a plurality of and two liang link to each other side by side, and a plurality of heat transfer rooms are run through to the heat exchange tube level, the heat exchange tube includes upper heat exchange tube and lower floor's heat exchange tube, the one end of lower floor's heat exchange tube is equipped with air inlet, the same end of upper heat exchange tube is equipped with the air gas vent, lower floor's heat exchange tube with the other end of upper heat exchange tube is equipped with the air transfer room, be equipped with between two adjacent heat transfer rooms the baffle, the top and the bottom of heat transfer room are equipped with the flue gas transfer room, flue gas inlet, heat transfer room, flue gas transfer room and flue gas.
Furthermore, the air inlet, the lower layer heat exchange tube, the air transfer chamber, the upper layer heat exchange tube and the air exhaust port form an air heat exchange channel.
Preferably, the diameter of the open pore is not less than the diameter of the heat exchange tube.
The dust cleaning device comprises a first drive plate, a second drive plate, a dust cleaning ring and a power mechanism, a plurality of through holes are formed in the first drive plate and the second drive plate, the heat exchange tube is sleeved in the through holes, the dust cleaning ring is arranged between the first drive plate and the second drive plate and movably sleeved on the heat exchange tube, the power mechanism is connected with the first drive plate and the second drive plate, and the first drive plate or the second drive plate drives the dust cleaning ring to move along the outer wall of the heat exchange tube under the driving of the power mechanism.
Furthermore, the ash removing rings are multiple, and the ash removing rings are sleeved on each heat exchange tube.
Further, the number of the through holes in the first driving plate is consistent with that of the heat exchange tubes, and the number of the through holes in the second driving plate is consistent with that of the heat exchange tubes.
Further, the inner diameter of the ash removing ring is larger than the diameter of the heat exchange tube, and the outer diameter of the ash removing ring is larger than the aperture of the through hole.
Furthermore, travel switches are arranged at the two ends of the heat exchange tube close to the power mechanism.
Furthermore, the power mechanism comprises a motor, a chain wheel and a chain, the chain wheel is arranged at two ends of the chain, a driving arm is arranged on the chain, and the chain is connected with the first driving plate and the second driving plate through the driving arm.
The invention has the beneficial effects that:
1. the invention designs the high-temperature flue gas channel and the air heat exchange channel skillfully, divides the air into two layers for heating, adopts the counter-flow heat exchange, leads the high-temperature flue gas which just enters the heat exchange chamber to directly heat the preheated air, increases the heat transfer temperature difference, improves the heat transfer efficiency, and recovers the waste heat more effectively.
2. The ash cleaning device is arranged on the air preheater, so that the dust accumulation phenomenon of the heat exchange tube is reduced, and the heat exchange efficiency of the air preheater is further improved.
3. Set up a plurality of heat transfer rooms and flue gas transfer room, two liang link to each other side by side between the heat transfer room, increase air flow rate simultaneously, improve the torrent effect of flue gas, this kind of setting has increased the tube side that the high temperature flue gas got into the heat transfer room, has improved heat transfer coefficient, and then improves air heater's heat exchange efficiency.
Drawings
FIG. 1 is a schematic structural view of example 1.
FIG. 2 is a partial structural view of embodiment 1.
Fig. 3 is a side view of the structure of fig. 2.
Fig. 4 is an exploded view of the structure of fig. 2.
FIG. 5 is a schematic view of an air preheater with ash removal devices.
FIG. 6 is a side view of an air preheater with ash removal devices.
Fig. 7 is an enlarged view of the labeled portion of fig. 6.
FIG. 8 is a top view of an air preheater with ash removal devices.
Fig. 9 is a combination view of a heat exchange pipe and a driving plate.
FIG. 10 is a schematic view of the construction of the drive plate and the soot ring.
Fig. 11 is a structural diagram of a driving plate.
Fig. 12 is one of the structural schematic diagrams of the power mechanism.
Fig. 13 is a second schematic structural view of the power mechanism.
FIG. 14 is a schematic structural view of embodiment 2.
In the figure, 1, a heat exchange chamber, 2, a flue gas inlet, 3, a flue gas outlet, 4, heat exchange pipes, 41, an upper layer heat exchange pipe, 42, a lower layer heat exchange pipe, 5, a partition plate, 51, an opening, 6, an air inlet, 7, an air outlet, 8, an air transfer chamber, 9, a flue gas transfer chamber, 10, a dust cleaning device, 101, a first driving plate, 102, a second driving plate, 103, a dust cleaning ring, 104, a power mechanism, 1041, a motor, 1042, a chain wheel, 1043, a chain, 1044, a first speed reducer, 1045, an angle converter, 1046, a cross universal coupling, 1047, a second speed reducer, 1048, two-side power transmission shafts, 1049, driving arms, 1050, a chain box, 105, 106 and a travel switch are arranged.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described below with reference to the accompanying drawings and embodiments.
Example 1
As shown in fig. 1-4, the self-cleaning air preheater comprises a heat exchange chamber 1, a flue gas inlet 2 is arranged at the top end of the heat exchange chamber 1, a flue gas outlet 3 is arranged at the bottom end of the heat exchange chamber 1, and the flue gas inlet 2, the heat exchange chamber 1 and the flue gas outlet 3 form a high-temperature flue gas channel. Horizontal direction sets up many heat exchange tubes 4 in heat transfer chamber 1, heat exchange tube 4 both ends all are equipped with baffle 5, be equipped with the trompil 51 corresponding with heat exchange tube 4 quantity on the baffle 5, wherein the aperture of trompil 51 is not less than the diameter of heat exchange tube 4, heat exchange tube 4 includes upper heat exchange tube 41 and lower floor's heat exchange tube 42, the one end of lower floor's heat exchange tube 42 is equipped with air inlet 6, upper heat exchange tube 41 is equipped with air exhaust port 7 with one end, the other end of lower floor's heat exchange tube 42 and upper heat exchange tube 41 is equipped with air transfer room 8, air inlet 6, lower floor's heat exchange tube 42, air transfer room 8, upper heat exchange tube 41.
The heat exchange process comprises the following steps:
in the direction of the arrow in fig. 1, air enters the lower heat exchange tube 42 from the air inlet 6, then flows into the air transfer chamber 8, enters the upper heat exchange tube 41 after passing through the air transfer chamber 8, and finally flows out from the air outlet 7. Meanwhile, high-temperature flue gas enters the heat exchange chamber 1 from the flue gas inlet 2, sequentially passes through the upper-layer heat exchange tube 41 and the lower-layer heat exchange tube 42, respectively exchanges heat with air of the upper-layer heat exchange tube 41 and the lower-layer heat exchange tube 42, and is finally discharged from the flue gas exhaust port 3.
The heat exchange principle is as follows:
the air preheater has three ways of enhancing heat transfer, namely improving heat transfer coefficient, increasing heat transfer temperature difference and enlarging heat transfer area.
The embodiment mainly improves the heat transfer efficiency by increasing the heat transfer temperature difference: the higher difficult heating more of the temperature of air, high temperature flue gas passageway and air heat transfer passageway have been designed ingeniously to this embodiment, divide into two-layer heating with the air, the air gas vent is established on the air heater top at upper strata and flue gas inlet, this setting makes the high temperature flue gas that just gets into in the air heater heat upper air, the high temperature flue gas gets into lower floor's heat exchange tube behind the upper heat exchange tube, the flue gas waste heat continues to heat lower floor's air this moment, and lower floor's air is after preheating, become the upper air after passing air transfer room 8, so the circulation. The embodiment adopts the counter-flow heat exchange, so that the high-temperature flue gas which just enters the heat exchange chamber 1 directly heats the preheated air, the heat transfer temperature difference is increased, and the waste heat is recovered more effectively.
Use shell and tube type air heater can solve flue gas waste heat recovery's problem well, but the high temperature flue gas that the industry produced all contains a large amount of dust or disintegrating slag, and at the waste heat recovery in-process, dust or disintegrating slag adsorb very easily or the adhesion is at the heat transfer pipe outer wall, and long-time dust accumulation can reduce air heater's heat exchange efficiency, seriously influences air heater's normal use.
As shown in fig. 5 to 11, in order to further improve the heat exchange efficiency of the air preheater, the embodiment further includes a dust removing device 10, the dust removing device 10 includes a first driving plate 101, a second driving plate 102, a dust removing ring 103 and a power mechanism 104, a plurality of through holes 105 are respectively disposed on the first driving plate 101 and the second driving plate 102, the heat exchange tube 4 is sleeved in the through holes 105, and the dust removing ring 103 is disposed between the first driving plate 101 and the second driving plate 102 and movably sleeved on the heat exchange tube 4. The number of the through holes 105 on the first driving plate 101 is the same as that of the heat exchange tubes 4, the number of the through holes 105 on the second driving plate 102 is the same as that of the heat exchange tubes 4, and travel switches 106 are arranged at two ends of each heat exchange tube 4, which are close to the power mechanism 104.
When the ash removal device 10 is installed, firstly, the through holes 105 on the first drive plate 101 are aligned with the corresponding heat exchange tubes 4, the first drive plate 101 is sleeved in one end of each heat exchange tube 4, then the ash removal rings 103 are sleeved in the heat exchange tubes 4 one by one, the ash removal ring 103 is ensured to be sleeved on each heat exchange tube 4, then, the through holes 105 on the second drive plate 102 are aligned with the corresponding heat exchange tubes 4, the second drive plate 102 is sleeved in one end of each heat exchange tube 4, the ash removal rings 103 are ensured to be positioned between the first drive plate 101 and the second drive plate 102, the first drive plate 101 and the second drive plate 102 are combined into a whole through four shafts, and finally, the power mechanism 104 is connected with the first drive plate 101 and the second drive plate 102, and the first drive plate 101 and the second drive plate 102 are ensured to drive the ash removal rings 103 to move along the outer walls of the.
As can be seen from FIGS. 6 to 7, the number of the ash removal rings 103 is multiple, one ash removal ring 103 is sleeved on the outer wall of each heat exchange tube 4, and the ash removal rings 103 are not interfered with each other, so that the damage or failure of one ash removal ring 103 does not affect the use of other ash removal rings 103. The inner diameter of the dust removing ring 103 is larger than the diameter of the heat exchange tube 4, the outer diameter of the dust removing ring 103 is larger than the aperture of the through hole 105, the dust removing ring 103 is strictly controlled between the first drive plate 101 and the second drive plate 102 and is not connected with the power mechanism 104, the dust removing ring can not move in an independent and regular manner on the outer wall of the heat exchange tube 4 and can only move forcibly when the first drive plate 101 or the second drive plate 102 moves, so that dust on the outer wall of the heat exchange tube 4 is continuously scraped, and the heat exchange efficiency of the air preheater is ensured.
In the figure 7, the ash removing ring 103 is movably sleeved on the heat exchange tube 4, a gap of 1-3 mm exists between the ash removing ring 103 and the heat exchange tube 4, and the ash removing ring 103 cannot be clamped even if the heat exchange tube 4 is bent. The heat exchange tube 4 is sleeved in the through holes 105 on the first driving plate 101 and the second driving plate 102, a larger gap exists between the through hole 105 and the heat exchange tube 4, the first driving plate 101 and the second driving plate 102 cannot be clamped and failed due to bending or deformation of the heat exchange tube 4, the aperture of the through hole 105 is only required to be smaller than the outer diameter of the dust removing ring 103, requirements on the specific shape and size of the aperture of the through hole 105 are not strict, and the processing and the manufacturing are simple. Preferably, the outer diameter of the dust removing ring 103 is 10 to 28mm larger than the diameter of the through hole 105.
As can be seen from fig. 12 to 13, the power mechanism 104 includes a motor 1041, a sprocket 1042 and a chain 1043, the sprocket 1042 is disposed at two ends of the chain 1043, the chain 1043 is connected to the first drive plate 101 and the second drive plate 102 through a drive arm 1049, in order to optimize the structure of the power mechanism 104, the number of the motors 1041 is 1 in this embodiment, the air preheater is provided with two side power transmission shafts 1048 in a direction perpendicular to the movement of the drive plates, one end of each of the two side power transmission shafts 1048 is connected to a first reducer 1044, the first reducer 1044 is connected to the motor 1041, two ends of each of the two side power transmission shafts 1048 are provided with an angle converter 1045, a cross universal coupling 1046 is connected to a lower end of the angle converter 1045, the cross universal coupling 1046 is provided with a second reducer 1047 near the sprocket.
Process of driving the driving plate by the power mechanism 104:
the motor 1041 outputs rotary power to both ends of the first speed reducer 1044 after being decelerated by the first speed reducer 1044, and the power is respectively transmitted to the angle converters 1045 at both ends by the power transmission shafts 1048 at both sides, then, the power is transmitted to the cross universal coupling 1046 through the angle converter 1045, the cross universal coupling 1046 receives the driving force and then transmits the power to the chain wheel 1042 through the second speed reducer 1047, the chain wheel 1042 rotates and then pulls the chain 1043 to move, the chain 1043 further drives the first driving plate 1 and the second driving plate 2 to and fro between the stroke switches 106 through the driving arm 1049, and dust on the outer wall of the heat exchange tube 4 is continuously removed.
The ash removal steps of the heat exchange tube 4 by using the ash removal device 10 are as follows:
s1: the power mechanism 104 drives the first driving plate 101 and the second driving plate 102, the first driving plate 101 pushes the dust removing ring 103 to move towards one end of the heat exchange tube 4, and the dust removing ring 103 scrapes off dust on the heat exchange tube 4;
s2: the first driving plate 101 stops moving when pushing the dust removing ring 103 to move to the travel switch 106 at one end of the heat exchange tube 4;
s3: the power mechanism 104 drives the first driving plate 101 and the second driving plate 102, the second driving plate 102 pushes the dust removing ring 103 to move towards the other end of the heat exchange tube 4, and the dust removing ring 103 scrapes off dust on the heat exchange tube 4;
s4, the second driving plate 102 stops moving when pushing the dust cleaning ring 103 to move to the travel switch 106 at the other end of the heat exchange tube 4;
s5: and repeating the steps.
The beneficial effects that above-mentioned ash removal device 10 reaches:
1. the ash removing ring 103 is movably sleeved on the heat exchange tube 4 and arranged between the two drive plates, and the ash removing ring 103 is driven to move back and forth on the outer wall of the heat exchange tube 4 through the movement of the drive plates, so that dust on the outer wall of the heat exchange tube 4 is continuously scraped, the heat exchange efficiency of the heat exchange tube 4 is ensured, the structure is simple, and the design is ingenious.
2. The driving plates are provided with through holes 105, the aperture of each through hole 105 is smaller than the outer diameter of each ash removal ring 103, and in the ash removal process, the ash removal rings 103 are strictly controlled between the two driving plates, so that the ash removal rings 103 are guaranteed to move along with the movement of the driving plates.
3. Every heat exchange tube 4 outer wall all overlaps and has an ash removal ring 103, each noninterference between each ash removal ring 103, and the damage or the malfunctioning use that can not influence other ash removal rings 103 of an ash removal ring 103, the maintenance is simple, economical and practical.
4. Deashing ring 103 movable sleeve has 1 ~ 3 mm's space on heat exchange tube 4 between deashing ring 103 and the heat exchange tube 4, even the crooked condition appears in heat exchange tube 4, deashing ring 103 can not blocked yet, and the practicality is strong.
5. The heat exchange tube 4 is sleeved in the through hole 105 in the drive plate, a large gap exists between the through hole 105 and the heat exchange tube 4, the drive plate cannot be stuck to fail due to bending or deformation of the heat exchange tube 4, only the aperture of the through hole 105 needs to be ensured to be smaller than the outer diameter of the dust removing ring 103, the requirements on the specific shape and size of the aperture of the through hole 105 are not strict, the design is reasonable, and the processing and manufacturing are simple.
To sum up, the inner structure of this embodiment ingenious design air heater itself reaches the effect of intensive heat transfer through the increase heat transfer difference in temperature, in addition, sets up ash removal device 10 on air heater, reduces heat exchange tube 4's laying dust phenomenon, has further improved air heater's heat exchange efficiency.
Example 2
As shown in fig. 14, the present embodiment includes 3 heat exchange chambers 1 and two of them are connected side by side, multiple heat exchange tubes 4 horizontally run through 3 heat exchange chambers 1, a partition plate 5 is disposed between two ends of each heat exchange tube 4 and two adjacent heat exchange chambers 1, a hole 51 corresponding to the number of the heat exchange tubes 4 is disposed on the partition plate 5, a diameter of the hole 51 is not smaller than a diameter of each heat exchange tube 4, each heat exchange tube 4 includes an upper heat exchange tube 41 and a lower heat exchange tube 42, one end of each lower heat exchange tube 42 is provided with an air inlet 6, the same end of each upper heat exchange tube 41 is provided with an air exhaust port 7, the other ends of the lower heat exchange tube 42 and the upper heat exchange tube 41 are provided with an air transfer chamber 8, the air inlet 6, the lower heat exchange.
The top of the heat exchange chamber 1 on one side of the air exhaust port 6 is provided with a flue gas inlet 2, the bottom of the heat exchange chamber 1 on one side of the air transfer chamber 8 is provided with a flue gas exhaust port 3, the top and the bottom of the heat exchange chamber 1 are also provided with a flue gas transfer chamber 9, and the flue gas inlet 2, the heat exchange chamber 1, the flue gas transfer chamber 9 and the flue gas exhaust port 3 form a high-temperature flue gas channel.
The heat exchange process comprises the following steps:
in the direction of the arrow in fig. 1, air enters the lower heat exchange tube 42 from the air inlet 6, then flows into the air transfer chamber 8, enters the upper heat exchange tube 41 after passing through the air transfer chamber 8, and finally flows out from the air outlet 7. Meanwhile, in combination with the direction of the arrow in fig. 14, the high-temperature flue gas enters the heat exchange chamber 1 from the flue gas inlet 2, exchanges heat with the air in the heat exchange tube 4, passes through the flue gas transit chamber 9 at the bottom end and the top end of the heat exchange chamber 1 and the plurality of heat exchange chambers 1, and is finally discharged from the flue gas exhaust port.
The heat exchange principle is as follows:
the embodiment utilizes two technical approaches of improving the heat transfer coefficient and increasing the heat transfer temperature difference to improve the heat transfer efficiency:
1. in the embodiment, the turbulent flow effect of the flue gas is improved by increasing the air flow rate and the number of the heat exchange chambers 1, the arrangement increases the tube pass of the high-temperature flue gas entering the heat exchange chambers 1, and the heat transfer coefficient is improved, namely, the tube pass enhances heat transfer;
2. the higher difficult heating more that the temperature of air is, this embodiment ingenious has designed high temperature flue gas passageway and air heat transfer passageway, divide into two-layer heating with the air, and the air vent is established on the upper strata and the flue gas air inlet is established on the air heater top, and this setting makes the high temperature flue gas that just gets into in the air heater heat upper air. The embodiment adopts the counter-flow heat exchange, so that the high-temperature flue gas which just enters the heat exchange chamber 1 directly heats the preheated air, the heat transfer temperature difference is increased, and the waste heat is recovered more effectively.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should fall within the protection scope of the present invention.
Claims (10)
1. A self-cleaning air preheater comprises a heat exchange chamber (1), and is characterized in that:
the top end of the heat exchange chamber (1) is provided with a flue gas inlet (2), the bottom end of the heat exchange chamber (1) is provided with a flue gas exhaust port (3), and the flue gas inlet (2), the heat exchange chamber (1) and the flue gas exhaust port (3) form a high-temperature flue gas channel;
the heat exchange chamber (1) is internally provided with a plurality of heat exchange tubes (4) in the horizontal direction, both ends of each heat exchange tube (4) are provided with a partition plate (5), each partition plate (5) is provided with a hole (51) corresponding to the number of the heat exchange tubes (4), each heat exchange tube (4) comprises an upper heat exchange tube (41) and a lower heat exchange tube (42), one end of each lower heat exchange tube (42) is provided with an air inlet (6), the same end of each upper heat exchange tube (41) is provided with an air exhaust port (7), each lower heat exchange tube (42) is provided with an air transfer chamber (8) at the other end of each upper heat exchange tube (41), and the air inlet (6), the lower heat exchange tube (42), the air transfer chamber (8), the upper heat exchange tube (41) and the air exhaust port.
2. A self cleaning air preheater according to claim 1, wherein: heat transfer chamber (1) is a plurality of and two liang link to each other side by side, and a plurality of heat transfer chambers (1) are run through to heat exchange tube (4) level, heat exchange tube (4) include upper heat exchange tube (41) and lower floor's heat exchange tube (42), the one end of lower floor's heat exchange tube (42) is equipped with air inlet (6), the same end of upper heat exchange tube (41) is equipped with air gas vent (7), lower floor's heat exchange tube (42) with the other end of upper heat exchange tube (41) is equipped with air transfer chamber (8), be equipped with between two adjacent heat transfer chambers (1) baffle (5), the top and the bottom of heat transfer chamber (1) are equipped with flue gas transfer chamber (9), flue gas inlet (2), heat transfer chamber (1), flue gas transfer chamber (9) and flue gas vent.
3. A self cleaning air preheater according to claim 2, wherein: the air inlet (6), the lower-layer heat exchange tube (42), the air transfer chamber (8), the upper-layer heat exchange tube (41) and the air exhaust port (7) form an air heat exchange channel.
4. A self cleaning air preheater according to claim 1, wherein: the aperture of the opening (51) is not smaller than the diameter of the heat exchange tube (4).
5. A self cleaning air preheater according to claim 1, wherein: the heat exchange tube type dust removing device is characterized by further comprising a dust removing device (10), wherein the dust removing device (10) comprises a first driving plate (101), a second driving plate (102), a dust removing ring (103) and a power mechanism (104), the first driving plate (101) and the second driving plate (102) are respectively provided with a plurality of through holes (105), the heat exchange tube (4) is sleeved in the through holes (105), the dust removing ring (103) is arranged between the first driving plate (101) and the second driving plate (102) and movably sleeved on the heat exchange tube (4), the power mechanism (104) is connected with the first driving plate (101) and the second driving plate (102), and the first driving plate (101) or the second driving plate (102) is driven by the power mechanism (104) to drive the dust removing ring (103) to move along the outer wall of the heat exchange tube (4).
6. A self cleaning air preheater according to claim 6, wherein: the ash removing ring (103) is multiple, and the ash removing ring (103) is sleeved on each heat exchange tube (4).
7. A self cleaning air preheater according to claim 6, wherein: the number of the through holes (105) in the first driving plate (101) is equal to that of the heat exchange tubes (4), and the number of the through holes (105) in the second driving plate (102) is equal to that of the heat exchange tubes (4).
8. A self cleaning air preheater according to claim 6, wherein: the inner diameter of the ash removing ring (103) is larger than the diameter of the heat exchange tube (4), and the outer diameter of the ash removing ring (103) is larger than the aperture of the through hole (105).
9. A self cleaning air preheater according to claim 6, wherein: travel switches (106) are arranged at the two ends of the heat exchange tube (4) close to the power mechanism (104).
10. A self cleaning air preheater according to claim 6, wherein: the power mechanism (104) comprises a motor (1041), a chain wheel (1042) and a chain (1043), the chain wheel (1042) is arranged at two ends of the chain (1043), a driving arm (1049) is arranged on the chain (1043), and the chain (1043) is connected with the first driving plate (101) and the second driving plate (102) through the driving arm (1049).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010168544.4A CN111237801A (en) | 2020-03-11 | 2020-03-11 | Self-cleaning air preheater |
| PCT/CN2021/078465 WO2021179928A1 (en) | 2020-03-11 | 2021-03-01 | Self-cleaning air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010168544.4A CN111237801A (en) | 2020-03-11 | 2020-03-11 | Self-cleaning air preheater |
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| CN111237801A true CN111237801A (en) | 2020-06-05 |
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| CN202010168544.4A Pending CN111237801A (en) | 2020-03-11 | 2020-03-11 | Self-cleaning air preheater |
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| Country | Link |
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| CN (1) | CN111237801A (en) |
| WO (1) | WO2021179928A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021179928A1 (en) * | 2020-03-11 | 2021-09-16 | 广东中鹏热能科技有限公司 | Self-cleaning air preheater |
| CN114110645A (en) * | 2021-10-28 | 2022-03-01 | 曾吉武 | Four-bin air heat exchanger |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116328437B (en) * | 2023-05-22 | 2023-08-01 | 阿拉善职业技术学院(内蒙古阿拉善广播电视大学阿拉善左旗职业中等专业学校阿拉善盟经济开发区中等职业学校) | Self-cleaning mechanism of van-type sack cleaner |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2133769Y (en) * | 1992-09-30 | 1993-05-19 | 赵和通 | Coal gas-air synchronous pre-heating unit |
| CN103267302B (en) * | 2013-06-17 | 2016-03-23 | 广西志远节能环保设备有限公司 | Boiler air preheater |
| CN203518717U (en) * | 2013-08-15 | 2014-04-02 | 北京首钢国际工程技术有限公司 | Tubular heat exchanger with detachable heat exchange tube rows |
| ES2540153B1 (en) * | 2013-10-09 | 2016-04-20 | Domingo Aquilino VILLORIA OTERO | Biomass combustion hot air generator |
| CN103644573A (en) * | 2013-11-05 | 2014-03-19 | 高密安耐橡胶有限公司 | Smoke dust removing and waste heat recovering integrated box of boiler |
| CN203964688U (en) * | 2014-07-15 | 2014-11-26 | 黄冈市华窑中亚窑炉有限责任公司 | Multisection type dual-layer face air heat exchanger for a kind of kiln |
| CN205279117U (en) * | 2016-01-12 | 2016-06-01 | 山东华创节能环保科技有限公司 | Automatic deashing residual heat from flue gas device of low temperature |
| CN206846778U (en) * | 2017-05-31 | 2018-01-05 | 重庆市商顺换热设备有限公司 | A kind of air preheater |
| CN207035205U (en) * | 2017-08-15 | 2018-02-23 | 重庆市商顺换热设备有限公司 | A kind of air preheater |
| CN111237801A (en) * | 2020-03-11 | 2020-06-05 | 广东中鹏热能科技有限公司 | Self-cleaning air preheater |
-
2020
- 2020-03-11 CN CN202010168544.4A patent/CN111237801A/en active Pending
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2021
- 2021-03-01 WO PCT/CN2021/078465 patent/WO2021179928A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021179928A1 (en) * | 2020-03-11 | 2021-09-16 | 广东中鹏热能科技有限公司 | Self-cleaning air preheater |
| CN114110645A (en) * | 2021-10-28 | 2022-03-01 | 曾吉武 | Four-bin air heat exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021179928A1 (en) | 2021-09-16 |
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