CN210373527U - Efficient plate-type air preheater - Google Patents

Efficient plate-type air preheater Download PDF

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Publication number
CN210373527U
CN210373527U CN201921140862.9U CN201921140862U CN210373527U CN 210373527 U CN210373527 U CN 210373527U CN 201921140862 U CN201921140862 U CN 201921140862U CN 210373527 U CN210373527 U CN 210373527U
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China
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heat transfer
air
temperature air
heat exchange
transfer section
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CN201921140862.9U
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王刚
陈万东
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Shanghai Richen Environmental Protection Technology Co ltd
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Shanghai Richen Environmental Protection Technology Co ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The utility model discloses a high-efficient plate-type air heater, which comprises a housin, be provided with high temperature air heat transfer section and low temperature air heat transfer section in the casing, high temperature air heat transfer section has air inlet and advances the mouth of cigarette, low temperature air heat transfer section has air outlet and outlet flue, high temperature air heat transfer section, low temperature air heat transfer section pass through the butt joint of air transition passageway, high temperature air heat transfer section and low temperature air heat transfer section are board-like heat transfer section, constitute by the polylith heat transfer board, are formed with the air runner that supplies circulation of air respectively and the flue gas runner that supplies the circulation of flue gas between the polylith heat transfer board, and this air runner and flue gas runner do not communicate each other, the whole S-shaped structure that is of heat transfer board.

Description

Efficient plate-type air preheater
Technical Field
The utility model relates to a plate air heater, in particular to a high-efficient plate air heater for steel industry hot rolling factory heating furnace.
Background
The tube array type air preheater generally adopted by the heating furnace of the hot rolling mill seriously reduces the heat exchange performance within one or two years due to the reasons of dust deposition and the like, so that the energy consumption of the heating furnace is increased; in addition, the material use temperature is limited, when the smoke temperature is high, a dilution fan needs to be started to mix high-temperature smoke into cold air for cooling operation, the waste heat of the smoke is not well recovered, and a lot of heat is wasted; the carbon steel pipe under the high temperature operating mode generally has short service life, and equipment leaks, needs blowing out the maintenance, influences production.
Compared with a tube type air preheater, the plate heat exchanger has many advantages, and the plate heat exchanger has no precedent of being successfully applied under the working condition of high-temperature (more than 600 ℃) smoke of a hot rolling heating furnace because of the processing technology, the structural design, the material and the like.
Although there is a split-flow plate type air preheater disclosed in chinese patent No. CN203731471U at present, the plates of the air preheater are of a flat plate structure, and the heat exchange plates are locations where intense heat exchange occurs between cold and hot fluids, the local temperature difference between two sides of the plates can reach above 600 ℃, the thermal stress is great, if the heat exchange plates are of a large flat plate structure, the direction of the expansion stress after heating is dispersed and disordered, which easily causes cracking of the plate surface and the weld joint, and the stress needs to be released through a reasonable structural design. Therefore, the heat exchange plate with the flat plate structure has short service life.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high-efficient plate-type air heater to the aforesaid of prior art is not enough and the defect to solve above-mentioned problem.
The utility model provides a technical problem can adopt following technical scheme to realize:
the utility model provides a high-efficient plate-type air preheater, includes the casing, be provided with high temperature air heat transfer section and low temperature air heat transfer section in the casing, high temperature air heat transfer section has air inlet and advances the mouth of cigarette, low temperature air heat transfer section has air outlet and outlet flue, high temperature air heat transfer section, low temperature air heat transfer section pass through the butt joint of air transition passageway, high temperature air heat transfer section and low temperature air heat transfer section are board-like heat transfer section, constitute by the polylith heat transfer board, are formed with the air runner that supplies circulation of air respectively and the flue gas runner that supplies the circulation of flue gas between the polylith heat transfer board, and this air runner and flue gas runner do not communicate each other, its characterized in that, the whole S-shaped structure that is of heat transfer.
In the utility model discloses a preferred embodiment, high temperature air heat transfer section and low temperature air heat transfer section are vertical section and take the structure of admitting air, giving vent to anger on, air transition passageway's both ends are connected respectively high temperature air heat transfer section and low temperature air heat transfer section bottom, the flue gas runner is the process the one-way horizontal structure of high temperature air heat transfer section and low temperature air heat transfer section, the mouth of admitting smoke sets up the both sides at the casing respectively with the mouth of discharging fume.
In a preferred embodiment of the present invention, the S-shaped structure is a three-segment arc structure with two sides bent toward the first surface and a middle bent toward the second surface.
In a preferred embodiment of the present invention, the S-shaped structure has a bending radius R of 0.5 m.
In a preferred embodiment of the present invention, the first and second surfaces of each heat exchange plate are provided with a plurality of first bosses and second bosses, the first bosses and the second bosses on each row are alternately arranged, and the first bosses and the second bosses between two adjacent heat exchange plates rigidly abut against each other.
In a preferred embodiment of the present invention, the heat exchange plate is made of a heat-resistant stainless steel material.
In a preferred embodiment of the present invention, the housing is further provided with an access opening.
In a preferred embodiment of the present invention, the heat exchange plate is connected to the inner wall of the casing through an expansion joint.
In a preferred embodiment of the present invention, the housing is made of heat resistant stainless steel 321.
Since the technical scheme as above is adopted, the utility model discloses a whole S-shaped structure that is of heat transfer board, can the effective absorption slab receive the stress after the high temperature inflation, and stress transmission direction is controlled, and the slab makes the direction of expansion stress become organized by the unordered change of dispersion, and this kind of structure makes the yield strength increase of slab simultaneously. Additionally, the utility model discloses an air preheating temperature generally can improve more than 100 ℃ than shell and tube preheater at least, and heat recovery is abundant, and is obvious to heating furnace overall system energy saving and emission reduction effect. Besides, the first boss and the second boss of the heat exchange plate have the functions of enhancing heat exchange by turbulent flow, increasing the strength of the thin plate and increasing the limited heat transfer area, and simultaneously have the function of supporting the adjacent runner structure; on one hand, the heat exchange area can be reduced by strengthening the heat exchange, the equipment cost is reduced, on the other hand, the on-way resistance loss of the fluid is reduced, and the pressure drop is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a sectional view a-a of fig. 1.
Fig. 3 is a sectional view B-B of fig. 1.
Fig. 4 is a cross-sectional view C-C of fig. 1.
Fig. 5 is a partial structural schematic view of a plate heat exchange section according to an embodiment of the present invention.
Fig. 6 is a schematic view of the stress direction structure of fig. 5.
Fig. 7 is an exploded view of the structure of four of the heat exchange plates of fig. 5.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further explained below.
Referring to fig. 1 to 7, the high-efficiency plate air preheater includes a housing 100, a high-temperature air heat-exchange section 210 and a low-temperature air heat-exchange section 220 are disposed in the housing 100, the high-temperature air heat-exchange section 210 has an air inlet 211 and a smoke inlet 212, and the low-temperature air heat-exchange section 220 has an air outlet 221 and a smoke outlet 222. The high-temperature air heat exchange section 210 and the low-temperature air heat exchange section 220 are butted through an air transition channel 230, the high-temperature air heat exchange section 210 and the low-temperature air heat exchange section 220 are plate type heat exchange sections and are composed of a plurality of heat exchange plates 10, an air flow channel 240 for air circulation and a flue gas flow channel 250 for flue gas circulation are formed between the plurality of heat exchange plates 10, and the air flow channel 240 and the flue gas flow channel 250 are not communicated with each other. In this embodiment, the high-temperature air heat exchange section 210 and the low-temperature air heat exchange section 220 are vertical sections and adopt an upper air inlet structure and an upper air outlet structure, and two ends of the air transition passage 230 are respectively connected to the bottoms of the high-temperature air heat exchange section 210 and the low-temperature air heat exchange section 220, so that the air heat exchange path is integrally U-shaped. The air inlet 211 of the high temperature air heat exchange section 210 and the air outlet 221 of the low temperature air heat exchange section 220 are respectively arranged at the top of the casing 100, the smoke inlet 212 and the smoke outlet 222 are respectively arranged at two sides of the casing 100, and the smoke flow channel 250 is a one-way horizontal structure passing through the high temperature air heat exchange section 210 and the low temperature air heat exchange section 220.
The heat exchange plate 10 is of an S-shaped structure as a whole, stress of the plate after high-temperature expansion can be effectively absorbed, the stress transmission direction is controlled (such as the stress N direction in fig. 6), the direction of the expansion stress of the plate is changed from disorder to organization, and meanwhile, the yield strength of the plate is increased due to the structure. The S-shaped structure in this embodiment is a three-segment arc structure with two sides curved toward the first surface 10a and a middle curved toward the second surface 10 b. The bending radius R of the S-shaped structure is 0.5m, and when the bending radius R of the S-shaped structure is too small, the whole heat exchange plate 10 protrudes towards the thickness direction, so that the equipment space is increased; when the bending radius R of the S-shaped structure is too large, the heat exchange plate 10 is almost indistinguishable from a flat plate structure, which is not conducive to stress guidance.
In this embodiment, the first surface 10a and the second surface 10b of each heat exchange plate 10 are provided with a plurality of first bosses 11a and second bosses 11b, the first bosses 11a and the second bosses 11b on each row are alternately arranged, and the first bosses 11a and the second bosses 11b between two adjacent heat exchange plates 10 are rigidly abutted against each other. The first boss 11a and the second boss 11b have turbulence enhanced heat exchange, and the heat exchange plate 10 has an overall S-shaped structure, so that the thermal deformation capacity is changed, and the first boss 11a and the second boss 11b not only can increase the strength of the thin plate and increase the limited heat transfer area, but also have the function of supporting the adjacent flow channel structure; on one hand, the heat exchange area can be reduced by strengthening the heat exchange, the equipment cost is reduced, on the other hand, the on-way resistance loss of the fluid is reduced, and the pressure drop is reduced. The heat exchange plate 10 is made of heat-resistant stainless steel materials, the heat exchange plate surface is smooth, the dirt coefficient is small, dust is not easy to deposit, the service temperature of the heat-resistant stainless steel is greatly improved compared with that of carbon steel, the heat exchanger can operate at high temperature, the air preheating temperature can be generally improved by more than 100 ℃ compared with that of a tubular preheater, heat recovery is sufficient, and the energy-saving and emission-reducing effects on the whole system of the heating furnace are obvious.
The heat exchange plate 10 is connected with the inner wall of the shell 100 through an expansion joint, the flow channel through which the heat exchange medium passes is completely welded and sealed, and the shell 100 is made of heat-resistant stainless steel 321, so that the capacity of the heat exchanger for resisting high-temperature deformation and causing weld cracking is greatly enhanced.
Still be provided with access hole 110 on casing 100, access hole 110 sets up the space between high temperature air heat transfer section 210, low temperature air heat transfer section 220, and all welds of heat transfer board cluster can all be overhauld, have to damage after long-term the back and can conveniently change the heat transfer slab alone, reduce the whole use cost of maintenance of equipment.
During operation, high temperature flue gas enters the casing 100 through the flue gas inlet 212 to heat the high temperature air heat exchange section 210, and then the high temperature flue gas passes through the low temperature air heat exchange section 220 to become low temperature flue gas and is discharged through the flue gas outlet 222. And the cold air entering from the air inlet 211 of the high temperature air heat exchange section 210 is heated by the high temperature air heat exchange section 210 and then changed into hot air, which is discharged from the air outlet 221 of the low temperature air heat exchange section 220.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. The utility model provides a high-efficient plate-type air preheater, includes the casing, be provided with high temperature air heat transfer section and low temperature air heat transfer section in the casing, high temperature air heat transfer section has air inlet and advances the mouth of cigarette, low temperature air heat transfer section has air outlet and outlet flue, high temperature air heat transfer section, low temperature air heat transfer section pass through the butt joint of air transition passageway, high temperature air heat transfer section and low temperature air heat transfer section are board-like heat transfer section, constitute by the polylith heat transfer board, are formed with the air runner that supplies circulation of air respectively and the flue gas runner that supplies the circulation of flue gas between the polylith heat transfer board, and this air runner and flue gas runner do not communicate each other, its characterized in that, the whole S-shaped structure that is of heat transfer.
2. A high efficiency plate air preheater as recited in claim 1, wherein said high temperature air heat exchange section and said low temperature air heat exchange section are vertical sections and adopt an upper air inlet and an upper air outlet structure, two ends of said air transition passage are respectively connected to bottoms of said high temperature air heat exchange section and said low temperature air heat exchange section, said flue gas flow passage is a single-pass horizontal structure passing through said high temperature air heat exchange section and said low temperature air heat exchange section, and said flue gas inlet and said flue gas outlet are respectively disposed at two sides of said housing.
3. A high efficiency plate air preheater as recited in claim 1, wherein said S-shaped structure is generally a three-segment arcuate structure having two sides curved toward said first surface and a middle curved toward said second surface.
4. A high efficiency plate air preheater as recited in claim 3, wherein said S-shaped configuration has a radius of curvature R of 0.5 m.
5. A high efficiency plate air preheater as recited in claim 1, wherein said first and second surfaces of each heat exchange plate are formed with a plurality of first bosses and second bosses, said first bosses and said second bosses in each row being alternately spaced, said first bosses and said second bosses between adjacent heat exchange plates being rigidly abutted against each other.
6. A high efficiency plate air preheater as recited in claim 1, wherein said heat exchange plates are made of heat resistant stainless steel material.
7. A high efficiency plate air preheater as recited in claim 1, wherein said housing is further provided with access openings.
8. A high efficiency plate air preheater as recited in claim 1, wherein said heat exchange plates are connected to said inner wall of said housing by expansion joints.
9. A high efficiency plate air preheater as recited in claim 1, wherein said housing is made of heat resistant stainless steel 321.
CN201921140862.9U 2019-07-19 2019-07-19 Efficient plate-type air preheater Active CN210373527U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921140862.9U CN210373527U (en) 2019-07-19 2019-07-19 Efficient plate-type air preheater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921140862.9U CN210373527U (en) 2019-07-19 2019-07-19 Efficient plate-type air preheater

Publications (1)

Publication Number Publication Date
CN210373527U true CN210373527U (en) 2020-04-21

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114184065A (en) * 2021-12-20 2022-03-15 北京瑞晨航宇能源科技有限公司 High-temperature plate heat exchanger and temperature control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114184065A (en) * 2021-12-20 2022-03-15 北京瑞晨航宇能源科技有限公司 High-temperature plate heat exchanger and temperature control method

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