CN219572763U - Heat exchange structure and air preheater - Google Patents
Heat exchange structure and air preheater Download PDFInfo
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- CN219572763U CN219572763U CN202320506139.8U CN202320506139U CN219572763U CN 219572763 U CN219572763 U CN 219572763U CN 202320506139 U CN202320506139 U CN 202320506139U CN 219572763 U CN219572763 U CN 219572763U
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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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Abstract
The utility model discloses a heat exchange structure and an air preheater. The heat exchange structure comprises a heat exchange housing, and the heat exchange housing is provided with a plurality of through holes; a enamel pipe having a first end and a second end; the heat exchange housing surrounds the heat exchange cavity to form a heat exchange cavity, and the heat exchange cavity comprises a first heat exchange port and a second heat exchange port which are oppositely arranged; and the sealing piece is matched with the first end part, the second end part and the through hole at the same time so as to enable the enamel pipe to be communicated with the through hole. Therefore, the corrosion resistance of the enamel pipe can effectively avoid dew point corrosion of the heat exchange structure, and the enamel pipe can be detached through the cooperation of the external threads and the internal threads, so that the enamel pipe is more convenient for daily maintenance and repair. The air preheater comprises the heat exchange structure, a flue gas channel and an air channel; the flue gas channel comprises a hot flue gas inlet and a cold flue gas outlet; the air passage is provided with a cold air inlet and a hot air outlet. Thus, the stable long-term operation of the biomass boiler is facilitated.
Description
Technical Field
The utility model relates to the technical field of air preheaters, in particular to a heat exchange structure and an air preheater.
Background
Biomass gas boilers are boilers that burn biomass gas, used as a support for fixed bed and fluidized bed gasifiers, and produce steam, heat transfer oil, or other heating medium by burning biomass gas.
The combustion temperature of the biomass gas boiler is usually about 1000 ℃, and if the temperature of the finally discharged flue gas is too high, heat loss can be caused, so that the combustion efficiency of the biomass gas boiler is reduced, and the discharged flue gas is required to be cooled. On the other hand, since the main components of the biomass fuel gas are carbon monoxide, methane, hydrogen, carbon dioxide, ethylene, nitrogen and the like, the main components of the flue gas after the combustion of the biomass fuel gas are water vapor, and the content of the particles is less than 50mg/m 3 、NO X Less than 240mg/m 3 ，SO 2 Less than 50mg/m 3 If the flue gas temperature is too low, sulfides, nitrides and water vapor can condense, so that the tail part of the biomass gas boiler is subjected to acid corrosion, and the service life of the boiler is shortened.
Based on the two conditions, the current biomass boiler sequentially absorbs heat of high-temperature flue gas through an economizer and an air preheater arranged at the tail part, and finally the temperature of the flue gas is controlled to be above the dew point temperature, and is usually about 130 ℃.
However, the temperature of the back of the flue gas is too low under the condition of keeping the temperature of the flue gas, so that dew point corrosion can occur on the internal heat conduction pipe after the air preheater is used for about one year, and the cooling effect of the high-temperature flue gas is further affected. And once dew point corrosion occurs, the structure of the existing air preheater can only replace all the heat conduction pipes in the air preheater together, which is not beneficial to the stable long-term operation of the biomass boiler.
Disclosure of Invention
The embodiment of the utility model provides a heat exchange structure, the corrosion resistance of a enamel pipe can effectively avoid dew point corrosion of the heat exchange structure, and the detachable structure is convenient for maintenance and repair; the embodiment of the utility model also provides an air preheater comprising the heat exchange structure, which is beneficial to the stable long-term operation of the biomass boiler.
An embodiment of the present utility model provides a heat exchange structure, including:
the heat exchange housing is provided with a plurality of through holes;
the enamel pipe is provided with a first end part and a second end part;
the heat exchange housing surrounds the heat exchange cavity, and the heat exchange cavity comprises a first heat exchange port and a second heat exchange port which are oppositely arranged;
and the sealing piece is matched with the first end part, the second end part and the through hole at the same time so as to enable the enamel pipe to be communicated with the through hole.
In some embodiments, the seal comprises:
an internal thread provided in the through hole;
external threads provided at the first end and the second end;
wherein the external thread and the internal thread are matched.
In some embodiments, the seal comprises:
a nut;
external threads provided at the first end and the second end;
wherein the external thread is matched with the nut.
In some embodiments, the seal further comprises an asbestos washer disposed on a surface of the external thread.
In some embodiments, the enamel tubes are arranged in an array.
In some embodiments, the array of enamel tubes has a length E and a width F, and the length of the enamel tubes is determined according to the following formula:
L＝F+K
wherein L is the length of the enamel pipe, F is the width of the array arrangement of the enamel pipes, and K is the length coefficient of the enamel pipes.
In some embodiments, the K is 125.
Accordingly, an air preheater according to an embodiment of the present utility model includes a heat exchange structure as described in any one of the above, and:
the flue gas channel comprises a hot flue gas inlet and a cold flue gas outlet; the hot flue gas inlet is communicated with the first heat exchange port, and the cold flue gas outlet is communicated with the second heat exchange port;
the air channel is provided with a cold air inlet and a hot air outlet, and the cold air inlet and the hot air outlet are respectively communicated with the enamel pipe.
In some embodiments, the cold air inlet communicates with the first end and the hot air outlet communicates with the second end.
In some embodiments, the air channel further comprises:
the air channel body is provided with a communication port, and the communication port is communicated with the second end part;
all enamel pipes are divided into an air inlet group and an air outlet group, the cold air inlet is communicated with the first end part in the air inlet group, and the hot air outlet is communicated with the first end part in the air outlet group.
In some embodiments, the heat exchange housing comprises a first housing corresponding to the air intake group and a second housing corresponding to the air exhaust group, with an asbestos gasket disposed between the first housing and the second housing.
In some embodiments, the air preheater further comprises:
the inlet housing is arranged outside the hot flue gas inlet;
the outlet housing is arranged outside the cold flue gas outlet;
the heat exchange housing is arranged between the inlet housing and the outlet housing, and the inlet housing, the heat exchange housing and the outlet housing are detachably connected through bolts in sequence.
In some embodiments, an asbestos gasket is disposed between the inlet housing and the heat exchange housing, and an asbestos gasket is disposed between the heat exchange housing and the outlet housing.
Compared with the prior art, the heat exchange structure provided by the embodiment of the utility model comprises the heat exchange housing, wherein the heat exchange housing is provided with a plurality of through holes; a enamel pipe having a first end and a second end; the heat exchange housing surrounds the heat exchange cavity to form a heat exchange cavity, and the heat exchange cavity comprises a first heat exchange port and a second heat exchange port which are oppositely arranged; and the sealing piece is matched with the first end part, the second end part and the through hole at the same time so as to enable the enamel pipe to be communicated with the through hole. Therefore, the corrosion resistance of the enamel pipe can effectively avoid dew point corrosion of the heat exchange structure, and the enamel pipe can be detached through the cooperation of the external threads and the internal threads, so that the enamel pipe is more convenient for daily maintenance and repair.
Compared with the prior art, the air preheater provided by the embodiment of the utility model can be understood to have all the technical characteristics and beneficial effects of the heat exchange structure, and is not described herein.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a heat exchange structure according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a enamel pipe in a heat exchange structure according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of an array arrangement of enamel tubes in a heat exchange structure according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of an air preheater according to an embodiment of the present utility model;
FIG. 5 is a schematic view of another configuration of an air preheater according to an embodiment of the present utility model;
FIG. 6 is a schematic view of yet another configuration of an air preheater according to an embodiment of the present utility model;
FIG. 7 is a schematic diagram II of another configuration of an air preheater according to an embodiment of the present utility model;
reference numerals: 100-heat exchange housing; 110-a through hole; 200-enamel pipe; 210-a first end; 220-a second end; 230-air inlet group; 240-exhaust stack; 300-a heat exchange cavity; 310-a first heat exchange port; 320-a second heat exchange port; 400-seals; 410-internal threads; 420-external threads; 430-a nut; 440-asbestos washer; 500-smoke channels; 510-hot flue gas inlet; 520-cold flue gas outlet; 600-air channels; 610-cold air inlet; 620-hot air outlet; 630-an air channel body; 631-communication port; 700-inlet housing; 800-an outlet housing; 900-bolts.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
Referring to fig. 1, a schematic structural diagram of a heat exchange structure according to an embodiment of the present utility model is provided, and a first embodiment of the present utility model provides a heat exchange structure, including a heat exchange housing 100, a enamel pipe 200, a heat exchange cavity 300 and a sealing member 400.
The heat exchange housing 100 is provided with a plurality of through holes 110. The enamel pipe 200 has a first end 210, a second end 220. It will be appreciated that the enamel pipe 200 is a hollow tubular structure. The heat exchange cavity 300 is surrounded by the heat exchange housing 100, and the heat exchange cavity 300 includes a first heat exchange port 310 and a second heat exchange port 320 disposed opposite to each other. The sealing member 400 is simultaneously engaged with the first end 210, the second end 220 and the through-hole 110 to communicate the enamel pipe 200 with the through-hole 110.
Specifically, the heat exchange shell 100 may be a whole surface, such as a cylindrical surface, which is circumferentially arranged; or polygonal surfaces, such as four rectangular sides of a cuboid; or other shapes may be designed depending on the particular use scenario of the heat exchange structure.
Specifically, the corrosion resistance of the enamel pipe 200 can effectively avoid dew point corrosion of the heat exchange structure, and the enamel pipe 200 is detachable through the cooperation of the sealing member 400, the first end 210, the second end 220 and the through hole 110, so that the enamel pipe 200 is more convenient for daily maintenance and repair.
The portions of the enamel tube 200 from which the first end 210 and the second end 220 are removed may also be shaped according to the specific use of the heat exchange structure, such as a spiral tube, a bent tube, or other tubular shape.
Referring to fig. 2, a schematic structural diagram of a enamel pipe in a heat exchange structure according to an embodiment of the present utility model is shown,
the seal 400 includes:
an internal thread 410 provided in the through hole 110;
external threads 420 provided at the first end 210 and the second end 220;
wherein the external threads 420 and the internal threads 410 mate.
The seal 400 includes:
a nut 430;
external threads 420 provided at the first end 210 and the second end 220;
wherein the external threads 420 mate with the nut 430.
Further, in order to achieve better heat exchange efficiency, the sealing member 400 further includes an asbestos gasket 440, and the asbestos gasket 440 is disposed on the surface of the external thread 420 to further ensure that the heat exchange cavity 300 and the inner space of the enamel pipe 200 are isolated from each other.
Preferably, the internal threads 410, the external threads 420, and the nut 430 are all G2 threads. The G2 thread is a thread which is used more in practical engineering, is convenient to process and is matched with other structures.
Referring to fig. 3, a schematic diagram of an array arrangement of enamel tubes in a heat exchange structure according to an embodiment of the utility model is shown, and in an embodiment, the enamel tubes 200 are arranged in an array arrangement. The array arrangement facilitates uniform heating of the enamel pipe 200 by the flue gas passing through the inside of the heat exchange chamber 300. It is understood that the arrangement of the enamel tubes 200 can be further changed by those skilled in the art according to the gas or liquid entering the heat exchange structure to improve the heat exchange efficiency.
In one embodiment, the array of enamel tubes 200 is arranged to have a length E and a width F, and the length of the enamel tubes 200 is determined according to the following formula (I):
L＝F+K(I)
wherein L is the length of the enamel pipe 200, the unit is mm, F is the width of the array arrangement of the enamel pipe 200, the unit is mm, and K is the length coefficient of the enamel pipe 200.
According to the relation between the enamel pipe 200 and the array arrangement in the formula resume, the heat exchange efficiency of the heat exchange structure can be better improved.
Preferably, K is 125, which represents that the installation distance of the nuts 430 on the first end 210 and the second end 220 of the enamel pipe 200 is 125mm, and the diameter of the enamel pipe 200 is 60mm, which is a size adapted to the existing heat exchange structure and air preheater, and also can be selected according to the actual use requirement.
A second embodiment of the present utility model provides an air preheater comprising:
in the heat exchange structure of the first embodiment of the present utility model, the flue gas channel 500 includes a hot flue gas inlet 510 and a cold flue gas outlet 520; the hot flue gas inlet 510 is communicated with the first heat exchange port 310, and the cold flue gas outlet 520 is communicated with the second heat exchange port 320;
the air passage 600, the air passage 600 is provided with a cold air inlet 610 and a hot air outlet 620, and the cold air inlet 610 and the hot air outlet 620 are respectively communicated with the enamel pipe 200.
Specifically, the high-temperature flue gas enters the heat exchange cavity 300 from the hot flue gas inlet 510 and then heats the enamel pipe 200, the heat exchange temperature is reduced, and the low-temperature flue gas is discharged from the cold flue gas outlet 520. The low temperature air is heated by the enamel pipe 200 after entering the enamel pipe 200 through the cold air inlet 610, and the heat exchange temperature is increased, and the high temperature air is discharged through the hot air outlet 620. In this way, the air preheater completes the cooling of high-temperature flue gas and the heating of low-temperature air through the heat exchange structure, dew point corrosion of the air preheater can be effectively avoided through corrosion resistance of the enamel pipe 200, and the enamel pipe 200 can be detached through the cooperation of the sealing piece 400, the first end 210, the second end 220 and the through hole 110, so that the daily maintenance and the repair of the air preheater are more convenient.
Referring to fig. 4, a schematic structural diagram of an air preheater according to an embodiment of the present utility model is provided.
The cold air inlet 610 communicates with the first end 210 and the hot air outlet 620 communicates with the second end 220. At this time, all the internal air of the enamel pipe 200 has the same flow direction, i.e., the low temperature air enters from the first end 210, and the high temperature air is discharged from the second end 220 after the heat exchange is completed.
Referring to fig. 5, another schematic structure of an air preheater according to an embodiment of the present utility model is shown.
In one embodiment, the air channel 600 further includes an air channel body 630, the air channel body 630 being provided with a communication port 631, the communication port 631 communicating with the second end 220; all enamel pipes 200 are divided into an inlet group 230 and an outlet group 240, and a cool air inlet 610 communicates with the first end 210 in the inlet group 230 and a hot air outlet 620 communicates with the first end 210 in the outlet group 240. At this time, the low temperature air enters the air inlet group 230 from the first end 210 to perform the first stage heat exchange, enters the air passage 630 after the first stage heat exchange is completed, then enters the air outlet group 240 to perform the second stage heat exchange, and the high temperature air is discharged from the second end 220. According to the embodiment, low-temperature air is heated in two stages successively, so that heat exchange is more sufficient, and the heat of high-temperature flue gas is utilized more fully.
Further, the heat exchange housing 100 includes a first housing 130 corresponding to the air intake group 230 and a second housing 140 corresponding to the air exhaust group 240, and an asbestos gasket 440 is disposed between the first housing 130 and the second housing 140, so that the heat exchange efficiency of air can be further improved.
Referring to fig. 6, a schematic diagram of yet another structure of an air preheater according to an embodiment of the present utility model is shown.
In one embodiment, the air preheater further comprises:
an inlet housing 700, the inlet housing 700 being housed outside the hot flue gas inlet 510; the outlet cover shell 800, the outlet cover shell 800 covers the outside of the cold flue gas outlet 520; at this time, the heat exchange housing 100 is disposed between the inlet housing 700 and the outlet housing 800, and the inlet housing 700, the heat exchange housing 100 and the outlet housing 800 are detachably connected by bolts 900 in sequence. In this manner, the inlet casing 700, the heat exchange casing 100, and the outlet casing 800 can be quickly maintained or repaired by removing the bolts 900.
Further, an asbestos gasket 440 is provided between the inlet casing 700 and the heat exchange casing 100, and an asbestos gasket 440 is provided between the heat exchange casing 100 and the outlet casing 800.
Further, referring to fig. 7, a schematic diagram ii of another structure of an air preheater according to an embodiment of the present utility model is provided. This structure combines the structures of fig. 5 and 6, which is not only beneficial to the rapid maintenance or repair of the inlet housing 700, the heat exchange housing 100 and the outlet housing 800 by disassembling the bolts 900, but also beneficial to the sequential two-stage heating of the low-temperature air, so that the heat exchange is more sufficient, and the utilization of the heat of the high-temperature flue gas is also more sufficient.
Further, since the air preheater is generally used in biomass gas boilers, in combination with the above structure, the following size tables are provided for several types of biomass gas boilers in common use based on a schematic diagram one of a further structure of the air preheater provided in the embodiment of the present utility model shown in fig. 6 and a schematic diagram two of a further structure of the air preheater provided in the embodiment of the present utility model shown in fig. 7:
table 1 air preheater sizing table in common model of biomass gas boiler
The model is represented by the tonnage of the biomass gas boiler, the 10T biomass gas boiler is 10 tons, and the like. A is the length of the cold smoke outlet 520, B is the width of the cold smoke outlet 520, C is the length of the cold air inlet 610 and the hot air outlet 620, D is the width of the cold air inlet 610 and the hot air outlet 620, E is the length of the array arrangement of the enamel tubes 200, F is the width of the array arrangement of the enamel tubes 200, G is the depth of the cold air inlet 610 and the hot air outlet 620, and H is the depth of the air channel 630. In addition, the width of the flue gas channel 500 is also F, and in this case, the length of the enamel pipe 200, that is, the depth of the array arrangement is f+k, K is preferably 125mm, which means that the length of both ends of the enamel pipe 200 beyond the flue gas channel 500 is 125mm, which is a distance for installing the nut 430; the depth of the hot flue gas inlet 510 is preferably 650mm and the depth of the cold flue gas outlet 520 is preferably 1350mm. In one embodiment, the flue gas is channeled. In the actual use process, a person skilled in the art can select one or more air preheaters with any size from the table so as to meet the use requirement of the biomass gas boiler.
The foregoing has described in detail an electronic device provided by embodiments of the present utility model, and specific examples have been applied to illustrate the principles and embodiments of the present utility model, where the foregoing examples are only for aiding in understanding of the technical solution and core idea of the present utility model; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (13)
1. A heat exchange structure, comprising:
a heat exchange housing (100), the heat exchange housing (100) being provided with a plurality of through holes (110);
a porcelain enamel pipe (200), the enamel pipe (200) having a first end (210), a second end (220);
the heat exchange housing (100) surrounds and forms a heat exchange cavity (300), and the heat exchange cavity (300) comprises a first heat exchange port (310) and a second heat exchange port (320) which are oppositely arranged;
-a seal (400), said seal (400) and said first end (210), said second end (220) and said through hole (110) cooperating to put said enamel pipe (200) in communication with said through hole (110).
2. The heat exchange structure according to claim 1, wherein the seal (400) comprises:
an internal thread (410) provided in the through hole (110);
external threads (420) provided at the first end (210) and the second end (220);
wherein the external thread (420) and the internal thread (410) cooperate.
3. The heat exchange structure according to claim 1, wherein the seal (400) comprises:
a nut (430);
external threads (420) provided at the first end (210) and the second end (220);
wherein the external thread (420) mates with the nut (430).
4. A heat exchange structure according to claim 2 or 3, wherein the seal (400) further comprises an asbestos washer (440), the asbestos washer (440) being provided on a surface of the external thread (420).
5. The heat exchange structure according to claim 1, wherein the enamel tubes (200) are arranged in an array.
6. The heat exchange structure according to claim 5, wherein the array of enamel tubes (200) has a length E and a width F, and wherein the length of the enamel tubes (200) is determined according to the following formula:
L＝F+K
wherein L is the length of the enamel pipe (200), F is the width of the array arrangement of the enamel pipes (200), and K is the length coefficient of the enamel pipes (200).
7. The heat exchange structure of claim 6 wherein K is 125.
8. An air preheater, comprising:
the heat exchange structure of any one of claims 1 to 7, and:
a flue gas channel (500), the flue gas channel (500) comprising a hot flue gas inlet (510) and a cold flue gas outlet (520); the hot flue gas inlet (510) is communicated with the first heat exchange port (310), and the cold flue gas outlet (520) is communicated with the second heat exchange port (320);
an air channel (600), wherein the air channel (600) is provided with a cold air inlet (610) and a hot air outlet (620), and the cold air inlet (610) and the hot air outlet (620) are respectively communicated with the enamel pipe (200).
9. The air preheater according to claim 8, wherein said cold air inlet (610) is in communication with said first end (210) and said hot air outlet (620) is in communication with said second end (220).
10. The air preheater according to claim 8, wherein the air channel (600) further comprises:
an air channel body (630), the air channel body (630) being provided with a communication port (631), the communication port (631) communicating with the second end (220);
all enamel pipes (200) are divided into an air inlet group (230) and an air outlet group (240), the cold air inlet (610) is communicated with the first end (210) in the air inlet group (230), and the hot air outlet (620) is communicated with the first end (210) in the air outlet group (240).
11. The air preheater according to claim 10, wherein the heat exchange housing (100) comprises a first housing (130) corresponding to the air intake group (230) and a second housing (140) corresponding to the air exhaust group (240), an asbestos gasket (440) being disposed between the first housing (130) and the second housing (140).
12. The air preheater as set forth in claim 8, further comprising:
an inlet housing (700), the inlet housing (700) being housed outside the hot flue gas inlet (510);
an outlet housing (800), the outlet housing (800) being housed outside the cold flue gas outlet (520);
the heat exchange housing (100) is arranged between the inlet housing (700) and the outlet housing (800), and the inlet housing (700), the heat exchange housing (100) and the outlet housing (800) are detachably connected through bolts (900) in sequence.
13. The air preheater according to claim 12, wherein an asbestos gasket (440) is disposed between the inlet housing (700) and the heat exchange housing (100), and an asbestos gasket (440) is disposed between the heat exchange housing (100) and the outlet housing (800).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320506139.8U CN219572763U (en) | 2023-03-14 | 2023-03-14 | Heat exchange structure and air preheater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320506139.8U CN219572763U (en) | 2023-03-14 | 2023-03-14 | Heat exchange structure and air preheater |
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| Publication Number | Publication Date |
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| CN219572763U true CN219572763U (en) | 2023-08-22 |
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ID=87656189
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| CN202320506139.8U Active CN219572763U (en) | 2023-03-14 | 2023-03-14 | Heat exchange structure and air preheater |
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| Country | Link |
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| CN (1) | CN219572763U (en) |
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- 2023-03-14 CN CN202320506139.8U patent/CN219572763U/en active Active
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