CN219199247U - Countercurrent heat exchange plate type air preheater - Google Patents
Countercurrent heat exchange plate type air preheater Download PDFInfo
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- CN219199247U CN219199247U CN202223329062.6U CN202223329062U CN219199247U CN 219199247 U CN219199247 U CN 219199247U CN 202223329062 U CN202223329062 U CN 202223329062U CN 219199247 U CN219199247 U CN 219199247U
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- flue gas
- air preheater
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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 aims to disclose a countercurrent heat exchange plate type air preheater which comprises a plate heat exchange core body, an air preheater shell, a flue gas inlet joint, a flue gas outlet joint, an air inlet joint and an air outlet joint; the plate heat exchange core is formed by stacking double-side inclined corrugated plates, the double-side inclined corrugated plates comprise corrugated areas and flow guide areas, the corrugations of the corrugated areas are overlapped to form a flue gas flow channel and an air flow channel, the flue gas side protruding points of the flow guide areas are opposite to form a flue gas side support, the flow guide strips of the flow guide areas form an air side support, the large medium pressure difference can be borne without deformation, meanwhile, the structures of the corrugations of the corrugated areas and the flue gas side protruding points of the flow guide areas enhance turbulent flow, heat transfer is enhanced, the countercurrent heat exchange is realized due to the existence of the flow guide strips of the flow guide areas, the end difference of the air preheater is small, and the heat exchange efficiency of the air preheater is greatly improved. The full-welding type sealing mode is adopted to realize zero air leakage, overcomes the defect of high air leakage rate of the rotary air preheater, and can also be used for gas-liquid heat exchange and liquid-liquid heat exchange.
Description
Technical Field
The utility model relates to a plate-type air preheater, in particular to a countercurrent heat exchange plate-type air preheater for boiler flue gas waste heat recovery energy-saving equipment.
Background
The air preheater is a heat exchange device for heating air required by combustion by using waste heat of boiler exhaust gas. Currently, the forms of air preheaters are mainly rotary, tubular and fin.
The rotary air preheater has the following advantages: high heat transfer surface density of 500m 2 /m 3 The method comprises the steps of carrying out a first treatment on the surface of the The weight is light, and the thickness of the heat accumulation plate can reach 0.5mm at the thinnest; reasonable arrangement scheme, countercurrent heat exchange is adopted. The rotary air preheater is widely applied to the coal-fired generating units of 600MW and above, and the problems existing at present are mainly as follows: the air leakage rate is high, the air leakage rate is less than 10% when the initial operation is good, and the air leakage rate exceeds 20% after the sealing element is worn after long-time operation; the blocking caused by precipitation of ammonium bisulfate is liquid after the temperature is lower than 200 ℃, has high viscosity, and is combined with fly ash in flue gas to cause flow channel blocking after being adhered to a heat exchange surface; and (3) low-temperature corrosion, wherein sulfuric acid in the flue gas is separated out on a heat exchange surface below the acid dew point temperature, and the heat storage plate is corroded.
The tubular and tubular fin type air preheater is mainly used for 200MW and below coal-fired generator sets and various industrial boilers, can bear very high pressure and temperature, and has the problems of low heat exchange efficiency, easy blockage, huge volume and difficult flexible arrangement.
The traditional plate heat exchanger has compact structure, high heat transfer efficiency and small occupied area, but is more suitable for liquid-liquid heat exchange because the flow channel plates are small in distance and large in resistance loss and are very easy to block, and the traditional plate heat exchanger is sealed by adopting rubber gaskets and cannot bear larger pressure and higher temperature.
Therefore, there is a particular need for a counter flow heat exchange plate air preheater that addresses the above-described existing problems.
Disclosure of Invention
The utility model aims to provide a countercurrent heat exchange plate type air preheater, which overcomes the defects of high air leakage rate, easy blockage, low heat exchange efficiency, huge volume and the like of the conventional rotary type air preheater and combines the advantages of compact structure, high heat transfer efficiency, countercurrent heat exchange and the like of the plate type heat exchanger.
The technical problems solved by the utility model can be realized by adopting the following technical scheme:
a countercurrent heat exchange plate type air preheater comprises a plate heat exchange core body, an air preheater shell, a smoke inlet joint, a smoke outlet joint, an air inlet joint and an air outlet joint; the plate type heat exchange core body is arranged in the air preheater shell, the upper end face of the air preheater shell is connected with the smoke inlet joint, the lower end face of the air preheater shell is connected with the smoke outlet joint, the left end face and the right end face of the air preheater shell are divided into a sealing area and an opening area, and the opening area of the air preheater shell is respectively connected with the air inlet joint and the air outlet joint; the plate heat exchange core is formed by stacking double-side corrugated plates, wherein two adjacent double-side corrugated plates are stacked in a butt-stacking manner, and a plurality of double-side corrugated plates are sequentially stacked in a forward-stacking manner and are stacked in a butt-stacking manner to form the plate heat exchange core; the double-side inclined corrugated plate comprises a corrugated area and a diversion area, the corrugated area of the double-side inclined corrugated plate is inclined corrugations protruding towards two sides, a flue gas flow channel and an air flow channel are formed by overlapping the inclined corrugations in sequence, the distance between the flow channels is twice the height of the corrugations, diversion areas of the double-side inclined corrugated plate are provided with diversion area flue gas side protruding points protruding towards the flue gas side and diversion area diversion strips protruding towards the air side, the height of the diversion area flue gas side protruding points is consistent with the height of the corrugations, the diversion area flue gas side protruding points are contacted and oppositely arranged to form support of a diversion area flue gas channel of the double-side inclined corrugated plate, and the diversion area diversion strips are support of the diversion area air side of the double-side inclined corrugated plate; the flue gas passageway both sides are through flue gas side seal strake welded seal, and the length of flue gas side seal strake is unanimous with the length of two side inclined wave board, and the air passageway both sides are through the sealed strake welded seal of air side, and the length of the sealed strake of air side is unanimous with the length of two side inclined wave board ripple district.
In one embodiment of the utility model, the double sided diagonal corrugated board has an aspect ratio of 4/1 to 1/1.
In one embodiment of the utility model, the corrugation pitch angle of the corrugation regions of the double sided corrugated board is 30-70 degrees.
In one embodiment of the present utility model, the number of the flow guiding strips in the flow guiding area is 3-10.
The utility model has the following beneficial effects:
the plate type heat exchange plate type air preheater is characterized in that the plate type heat exchange core body is formed by stacking double-side corrugated plates, each double-side corrugated plate comprises a corrugated area and a flow guiding area, the corrugations of the corrugated areas are overlapped to form a flue gas flow channel and an air flow channel, the convex points on the flue gas side of the flow guiding area are opposite to form a flue gas side support, the flow guiding strips of the flow guiding area form an air side support, the flow guiding strips of the flow guiding area can bear larger medium pressure difference without deformation, meanwhile, the structures of the corrugations of the corrugated areas and the convex points on the flue gas side of the flow guiding area enhance turbulent flow, heat transfer is enhanced, the existence of the flow guiding strips of the flow guiding area realizes countercurrent heat exchange, so that the end difference of the air preheater is small, and the heat exchange efficiency of the air preheater is greatly improved.
When the flue gas flow is large and the dust content is high, the defects of low heat exchange efficiency, huge volume and easy blockage of the traditional tubular air preheater are overcome, the distance between the double-side corrugated plates is flexibly adjusted through the corrugation, the corrugated structure is suitable for high-flow flue gas, the blockage is avoided, the heat exchange is enhanced, and the heat exchange area and volume of the air preheater are reduced.
By adopting the all-welded sealing mode, zero air leakage can be realized, and the defect of high air leakage rate of the rotary air preheater is overcome.
The countercurrent heat exchange plate type air preheater of the utility model can also be used for gas-liquid heat exchange and liquid-liquid heat exchange.
The features of the present utility model will be apparent from the following detailed description of the preferred embodiments, taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a schematic view of a countercurrent heat exchange plate type air preheater of the present utility model;
FIG. 2 is a cross-sectional view of a plate heat exchange core of the present utility model;
FIG. 3 is a schematic view of the flue gas side of a double sided corrugated board of the present utility model;
fig. 4 is a schematic view of the air side of a double sided corrugated board of the present utility model.
Reference numerals illustrate: 1-plate heat exchange core, 2-air preheater shell, 3-flue gas inlet joint, 4-flue gas outlet joint, 5-air inlet joint, 6-air outlet joint, 11-double-side corrugated plate, 12-diversion area flue gas side salient points, 13-corrugated area, 14-diversion area diversion strip, 15-air side sealing edge strip and 16-flue gas side sealing edge strip.
Detailed Description
The utility model is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the utility model easy to understand.
Examples
The utility model relates to a countercurrent heat exchange plate type air preheater which comprises a plate type heat exchange core body 1, an air preheater shell 2, a smoke inlet joint 3, a smoke outlet joint 4, an air inlet joint 5 and an air outlet joint 6; the plate heat exchange core 1 is arranged in the air preheater shell 2, the upper end face of the air preheater shell 2 is connected with the smoke inlet joint 3, the lower end face of the air preheater shell 2 is connected with the smoke outlet joint 4, the left end face and the right end face of the air preheater shell 2 are divided into a sealing area and an opening area, and the opening area of the air preheater shell 2 is respectively connected with the air inlet joint 5 and the air outlet joint 6.
The plate heat exchange core body 1 is formed by stacking double-sided corrugated plates 11, two adjacent double-sided corrugated plates 11 are stacked in pairs, and a plurality of double-sided corrugated plates 11 are sequentially stacked in pairs to form the plate heat exchange core body 1; the corrugated areas 13 and the diversion areas are arranged on the double-sided corrugated plates 11, the corrugated areas 13 of the double-sided corrugated plates 11 are oblique corrugations protruding towards two sides, the diversion areas of the double-sided corrugated plates 11 are provided with diversion area flue gas side protruding points 12 protruding towards the flue gas side and diversion area diversion strips 14 protruding towards the air side, the corrugated areas 13 of the adjacent two double-sided corrugated plates 11 are placed in a superposed mode to form a flue gas flow channel and an air flow channel, the distance between the flow channels is twice the height of the oblique corrugations, the diversion area flue gas side protruding points 12 are in contact opposition to form diversion area flue gas side supports, and the diversion area diversion strips 14 form diversion area air side supports; the both sides of air runner are sealed by air side seal strake 15 welding, and the length of air side seal strake 15 is unanimous with the length of the ripple district of two side diagonal wave board 11, and the both sides of flue gas passageway are sealed by flue gas side seal strake 16 welding, and the length of flue gas side seal strake 16 is unanimous with the length of two side diagonal wave board 11.
Referring to fig. 1, high temperature flue gas flows in from a flue gas inlet joint 3, flows out from a flue gas outlet joint 4 after passing through a plate heat exchange core 1, the temperature of the flue gas is reduced, low temperature air flows in from an air inlet joint 5, flows out from an air outlet joint 6 after passing through the plate heat exchange core 1, the temperature of the air is increased, an air preheater shell 2 is arranged outside the plate heat exchange core 1, the fixation of the plate heat exchange core 1 is realized, the air preheater shell 2 is respectively sealed with the flue gas inlet joint 3, the flue gas outlet joint 4, the air inlet joint 5 and the air outlet joint 6 through welding to realize zero leakage of heat exchange medium to the environment, and the connection can also be realized through bolts to realize the detachability of the joints, thereby being beneficial to the transportation, the installation and the maintenance of the countercurrent heat exchange plate air preheater.
Referring to fig. 2, both sides of the air passage are welded and sealed by air side sealing beads 15, and both sides of the smoke passage are welded and sealed by smoke side sealing beads 16.
Referring to fig. 3, the double-sided corrugated plate 11 has a corrugated region 13 formed by compression molding and a flow guiding region flue gas side bump 12 protruding toward the flue gas side.
Referring to fig. 4, a flow guiding strip 14 is arranged at the air side flow guiding area on the double-sided corrugated plate 11 to realize countercurrent heat exchange of flue gas and air.
The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the foregoing embodiments, which have been described in the foregoing embodiments and description merely illustrates the principles of the utility model, and that various changes and modifications may be effected therein without departing from the spirit and scope of the utility model as defined in the appended claims and their equivalents.
Claims (4)
1. The countercurrent heat exchange plate type air preheater is characterized by comprising a plate heat exchange core body, an air preheater shell, a flue gas inlet joint, a flue gas outlet joint, an air inlet joint and an air outlet joint; the plate type heat exchange core body is arranged in the air preheater shell, the upper end face of the air preheater shell is connected with the smoke inlet joint, the lower end face of the air preheater shell is connected with the smoke outlet joint, the left end face and the right end face of the air preheater shell are divided into a sealing area and an opening area, and the opening area of the air preheater shell is respectively connected with the air inlet joint and the air outlet joint; the plate heat exchange core is formed by stacking double-side corrugated plates, wherein two adjacent double-side corrugated plates are stacked in a butt-stacking manner, and a plurality of double-side corrugated plates are sequentially stacked in a forward-stacking manner and are stacked in a butt-stacking manner to form the plate heat exchange core; the double-side inclined corrugated plate comprises a corrugated area and a diversion area, the corrugated area of the double-side inclined corrugated plate is inclined corrugations protruding towards two sides, a flue gas flow channel and an air flow channel are formed by overlapping the inclined corrugations in sequence, the distance between the flow channels is twice the height of the corrugations, diversion areas of the double-side inclined corrugated plate are provided with diversion area flue gas side protruding points protruding towards the flue gas side and diversion area diversion strips protruding towards the air side, the height of the diversion area flue gas side protruding points is consistent with the height of the corrugations, the diversion area flue gas side protruding points are contacted and oppositely arranged to form support of a diversion area flue gas channel of the double-side inclined corrugated plate, and the diversion area diversion strips are support of the diversion area air side of the double-side inclined corrugated plate; the flue gas passageway both sides are through flue gas side seal strake welded seal, and the length of flue gas side seal strake is unanimous with the length of two side inclined wave board, and the air passageway both sides are through the sealed strake welded seal of air side, and the length of the sealed strake of air side is unanimous with the length of two side inclined wave board ripple district.
2. A counter flow heat exchange plate type air preheater as set forth in claim 1, wherein said double sided corrugated plate has an aspect ratio of 4/1 to 1/1.
3. A counter flow heat exchange plate type air preheater as set forth in claim 1, wherein the corrugation pitch angle of the corrugated region of said double sided corrugated plate is 30-70 degrees.
4. A counter flow heat exchange plate type air preheater as set forth in claim 1, wherein the number of said flow guiding strips in said flow guiding zone is 3 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223329062.6U CN219199247U (en) | 2022-12-13 | 2022-12-13 | Countercurrent heat exchange plate type air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223329062.6U CN219199247U (en) | 2022-12-13 | 2022-12-13 | Countercurrent heat exchange plate type air preheater |
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| Publication Number | Publication Date |
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| CN219199247U true CN219199247U (en) | 2023-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223329062.6U Active CN219199247U (en) | 2022-12-13 | 2022-12-13 | Countercurrent heat exchange plate type air preheater |
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| Country | Link |
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| CN (1) | CN219199247U (en) |
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- 2022-12-13 CN CN202223329062.6U patent/CN219199247U/en active Active
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