CN102313294B - Self-closed integrally cast air preheater - Google Patents
Self-closed integrally cast air preheater Download PDFInfo
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- CN102313294B CN102313294B CN2011102138173A CN201110213817A CN102313294B CN 102313294 B CN102313294 B CN 102313294B CN 2011102138173 A CN2011102138173 A CN 2011102138173A CN 201110213817 A CN201110213817 A CN 201110213817A CN 102313294 B CN102313294 B CN 102313294B
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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 invention discloses a self-closed integrally cast air preheater, which comprises a shell body, a smoke inlet, a smoke outlet, an air inlet, an air outlet and a heat exchange component which is arranged in the shell body, wherein the heat exchange component comprises a plurality of cast fin heat exchange units; each cast fin heat exchange unit comprises a first matrix, a second matrix and fins which are respectively arranged at the two sides of the middles of the first matrix and the second matrix; the two ends of the first matrixes and the second matrixes are connected and molded into one body so that circular structures are formed; and main passageway structures are formed in the middle through the first matrixes and the second matrixes. Compared with the prior art, the problem of the seal surface smoke leakage of the heat exchange units, which exists in the cast air preheater formed by cast fin board heat exchange units in the prior art, is solved through the self-closed integrally cast air preheater disclosed by the invention, so that the self-closed integrally cast air preheater has the advantages of simple structure and light weight, is sealed reliably and is convenient to clean.
Description
Technical field
The present invention relates to the equipment and technology of petrochemical industry equipment special engineering, particularly relate to a kind of Self-closing type integral-casting air preheater.
Background technology
In the prior art, common casting air preheater, its structure includes housing 2, smoke inlet 1, exhanst gas outlet 7, air intake 6, air outlet slit 4 as shown in Figure 1, and is arranged at heat exchange element 3 and hermetically-sealed construction 5 in the housing 2.Its course of work is that flue gas enters from smoke inlet 1, and through discharging from exhanst gas outlet 7 after the heat exchange element 3 heat exchange heat releases, air enters from the air intake 6 of housing 2 sidewalls, discharges through the air outlet slit 4 from housing 2 sidewalls after the heat exchange element 3 heat exchanges heat absorption.As shown in Figure 2, its heat exchange element 3 is generally and includes a plurality of casting fin plate heat exchange units, casting fin plate heat exchange unit includes the first matrix 31, the second matrix 32, and the fin 311,321 that lays respectively at the both sides of the both sides of the first matrix 31 and the second matrix 32, the first matrix 31 and the second matrix 32 longitudinally align, and respectively by sealing bolt 10 its both ends that are tightly connected, be provided with sealing gasket 9 between the sealing surface at the first matrix 31 and the second matrix 32 both ends.
Its operation principle is: still enter at a high speed casting air preheater with the flue gas of low temperature exhaust heat from the smoke inlet 1 of casting air preheater, discharge from the exhanst gas outlet 7 of casting air preheater after casting fin plate heat exchange unit heat exchange heat release.And the flow process of air side is divided into two journeys, compress at a high speed from the air intake 6 of casting air preheater sidewall, level is finished a journey after flowing to the cover plate 8 of sidewall, then 90 ° of turnovers continue to flow along cover plate 8, level flows to the air outlet slit 4 of casting air preheater sidewall and flows out after 90 ° of turnovers again, finishes the second journey, in this two journey, air is from casting fin plate heat exchange unit heat exchange heat absorption, and the flow direction of its Air is mutually vertical with the flow direction of flue gas.
Above-mentioned casting air preheater of the prior art is because the both ends of the first matrix 31 and the second matrix 32 are to be connected and sealed by sealing bolt 10.And, when reality is used, people are in order to reduce production costs, the sealing surface that is used for press seal pad 9 that casting air preheater is positioned at casting fin plate heat exchange unit side is the casting hair side that does not pass through machining, when being full of flue gas between the first matrix 31 and the second matrix 32, fume side pressure will make the first matrix 31 and the second matrix 32 trend that the first matrix 31 shown in Figure 2 and the second matrix 32 open respectively laterally occur, and flue gas just outwards lets out from inner along the slit shown in the dotted arrow in heat exchange unit when serious.Flue gas from the leakage of heat exchange unit peripheral sealing surface not only so that the heat transfer effect of casting air preheater greatly reduce, increased inspection and maintenance, shortened life cycle, and a large amount of energy consumptions is arranged, be unfavorable for simultaneously casting the main equipment development to large tracts of land of fin plate heat exchange unit.
The flue gas that above-mentioned casting air preheater exists is from the problem of heat exchange unit sealing face leakage, also be the existing common issue with of air preheater of other type simultaneously, therefore, for the problem of flue gas in the flue gas flow from the leakage of heat exchange unit peripheral sealing surface, can fundamentally improve, have very far-reaching and great meaning in field of engineering technology.
Therefore, for above-mentioned the deficiencies in the prior art part, needing badly provides a kind of leakage that can fundamentally avoid the heat exchange unit sealing surface, and casting air preheater technology simple in structure, that seal reliably, be convenient to clean.
Summary of the invention
The object of the invention is to avoid weak point of the prior art and a kind of leakage that can fundamentally avoid the heat exchange unit sealing surface is provided, and Self-closing type integral-casting air preheater simple in structure, that seal reliably, be convenient to clean.
Purpose of the present invention is achieved through the following technical solutions:
A kind of Self-closing type integral-casting air preheater is provided, include housing, smoke inlet, exhanst gas outlet, air intake, air outlet slit, and be arranged at heat exchange element in the described housing, wherein, described heat exchange element includes a plurality of casting fin heat exchange units, described casting fin heat exchange unit includes the first matrix, the second matrix, and the fin that lays respectively at the both sides, middle part of the both sides, middle part of described the first matrix and described the second matrix, described the first matrix links to each other also integrally casting moulding and forms circulus with described the second matrix in both ends, described the first matrix and described the second matrix form the main body flow passage structure in the middle part.
Wherein, described main body flow passage structure is that cross section has close-shaped main body flow passage structure.
Wherein, described main body flow passage structure is the main body flow passage structure that cross section has rectangle.
Wherein, described cross section has four combinations that the angle is arc chord angle or right angle and arc chord angle of the main body flow passage structure of rectangle.
Wherein, described fin is one or any two kinds combination in the fin of sheet shape, columniform fin and the conical fin or three kinds combination.
Wherein, the described fin that is arranged in described main body flow passage structure is any one or two kinds of combinations of columniform fin and conical fin.
Wherein, described heat exchange element is to be provided with the above heat exchange element of one deck or one deck, and a plurality of casting fin heat exchange units in every layer of heat exchange element closely are connected in series.
Wherein, by sealing surface reeded bolt sealing structure being set between the described casting fin heat exchange unit mutually assembles and is tightly connected.
Wherein, the first matrix of the main body flow passage structure in described a plurality of casting fin heat exchange unit and the distance between the second matrix are equidistant the setting.
Wherein, the first matrix of the main body flow passage structure in described a plurality of casting fin heat exchange unit and the distance between the second matrix are different from arranging.
Beneficial effect of the present invention:
Self-closing type integral-casting air preheater of the present invention, include housing, smoke inlet, exhanst gas outlet, air intake, air outlet slit, and be arranged at heat exchange element in the housing, wherein, heat exchange element includes a plurality of casting fin heat exchange units, casting fin heat exchange unit includes the first matrix, the second matrix, and the fin that lays respectively at the both sides, middle part of the both sides, middle part of the first matrix and the second matrix, the first matrix links to each other also integrally casting moulding and forms circulus with the second matrix in both ends, the first matrix and the second matrix form the main body flow passage structure in the middle part.Compared with prior art, Self-closing type integral-casting air preheater of the present invention has overcome the problem that the traditional existing heat exchange unit sealing surface of casting air preheater flue gas that is made of casting fin plate heat exchange unit is revealed, have positiver sealing, simple in structure, lightweight, the characteristics being convenient to clean, also have simultaneously following characteristics:
(1) heat exchange element is comprised of casting fin heat exchange unit, the first matrix links to each other also integrally casting moulding and forms circulus with the second matrix in both ends, and the main body flow passage structure of himself is the continuous entity structure of self-isolation, casting fin plate heat exchange unit relatively of the prior art, because the both ends of the first matrix and the second matrix are integrated respectively casting, therefore, no longer there is the sealing bolt structure between the heat exchange unit fin plate in flue gas when this flow process flows, fundamentally solve the problem of smoke spillage; Simultaneously, can wash casting fin heat exchange unit inside and needn't worry again to damage the sealing bolt structure with clear water during maintenance, obviously simplify the structure on the whole, so that weight saving.
(2) both ends of the first matrix of casting fin heat exchange unit and the second matrix are one-body molded, thereby so that the constant distance between the first matrix and the second matrix is constant, this main body flow passage structure can guarantee the spacing of two matrixes, thereby so that the flow area that remains in the same casting fin heat exchange unit is stablized constant, keep flow velocity constant, the stability that is conducive to operate.
Description of drawings
The invention will be further described to utilize accompanying drawing, but the embodiment in the accompanying drawing does not consist of any limitation of the invention, for those of ordinary skill in the art, under the prerequisite of not paying creative work, can also obtain according to the following drawings other accompanying drawing.
Fig. 1 is the structural representation of casting air preheater of the prior art.
Fig. 2 is the part-structure schematic diagram of the casting fin plate heat exchange unit of casting air preheater of the prior art.
Fig. 3 is the part-structure schematic diagram of the casting fin heat exchange unit of Self-closing type integral-casting air preheater of the present invention.
Fig. 4 is the part-structure schematic diagram of the heat exchange element of Self-closing type integral-casting air preheater of the present invention.
Fig. 5 is the part-structure schematic diagram of the another kind of heat exchange element of Self-closing type integral-casting air preheater of the present invention.
Fig. 6 is the structural representation of Self-closing type integral-casting air preheater of the present invention.
In Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, include:
1---smoke inlet, 2---housing, 21---steelframe,
3---heat exchange element, 31---first matrix, 32---the second matrix,
311,321---fin, 312---first matrix end, 322---the second matrix end,
33---main body flow passage structure, 331---arc chord angle, 341---bolt hole, 342---bolt and nut, 343---groove,
4---air outlet slit, 5---hermetically-sealed construction, 6---air intake, 7---exhanst gas outlet,
8---cover plate, 9---sealing gasket, 10---sealing bolt,
A---flue gas flow channel, B---air flow channel.
The specific embodiment
The invention will be further described with the following Examples.
One of specific embodiment of Self-closing type integral-casting air preheater of the present invention with reference to shown in Figure 1, includes housing 2, smoke inlet 1, exhanst gas outlet 7, air intake 6, air outlet slit 4, and is arranged at the heat exchange element 3 in the housing 2.
Such as Fig. 3, Fig. 4 and shown in Figure 5, heat exchange element includes a plurality of casting fin heat exchange units, casting fin heat exchange unit includes the first matrix 31, the second matrix 32, and the fin 311,321 that lays respectively at the both sides, middle part of the both sides, middle part of the first matrix 31 and the second matrix 32, the respectively integrally casting moulding and form circulus of the second matrix end 322 at the first matrix end 312 at the two ends of the first matrix 31 and the two ends of the second matrix 32, the middle part of the first matrix 31 and the second matrix 32 forms main body flow passage structure 33.Compared with prior art, Self-closing type integral-casting air preheater of the present invention has overcome the problem that the traditional existing heat exchange unit sealing surface of casting air preheater flue gas that is made of casting fin plate heat exchange unit is revealed, has positiver sealing, simple in structure, lightweight, the characteristics of being convenient to clean, also have simultaneously following characteristics: heat exchange element is comprised of casting fin heat exchange unit, the main body flow passage structure 33 of himself is continuous entity structures of self-isolation, casting fin plate heat exchange unit relatively of the prior art, because the both ends of the first matrix 31 and the second matrix 32 are integrated respectively casting, therefore, no longer there is the sealing bolt structure between the heat exchange unit fin plate in flue gas when this flow process flows, fundamentally solve the problem of smoke spillage; Simultaneously, can wash casting fin heat exchange unit inside and needn't worry again to damage the sealing bolt structure with clear water during maintenance, obviously simplify the structure on the whole, so that weight saving, the convenient cleaning; The first matrix 31 of casting fin heat exchange unit and the one-body molded formation circulus in both ends of the second matrix 32, thereby so that the constant distance between the first matrix 31 and the second matrix 32 is constant, this main body flow passage structure 33 can guarantee the spacing of two matrixes, thereby so that the flow area that remains in the same casting fin heat exchange unit is stablized constant, keep flow velocity constant, the stability that is conducive to operate.
Concrete, main body flow passage structure 33 is close-shaped main body flow passage structure 33 for having cross section.The both ends of the first matrix 31 and the second matrix 32 are integrally casting moulding, so that the main body flow passage structure 33 that the first matrix 31 and the second matrix 32 middle parts surround seals, distinguish with the non-enclosed construction of the main body flow passage structure 33 of casting fin plate heat exchange unit of the prior art.
Concrete, main body flow passage structure 33 is for having the main body flow passage structure 33 that cross section is rectangle.Be convenient to processing and casting fin 311,321.Main body flow passage structure 33 can also be selected the main body flow passage structure 33 of ellipse or other types such as track type or circle.
Concrete, cross section is that four angles of the main body flow passage structure 33 of rectangle are the combination of arc chord angle 331 or right angle and arc chord angle 331.The main body flow channel cross-section of casting fin heat exchange unit is flat rectangular configuration, four angles of the inside of the main body flow passage structure 33 of the rectangle of casting fin heat exchange unit comprise right angle and 331 two kinds of syndetons of arc chord angle, specifically look the size of its suffered interior pressure, and the thickness of the first matrix 31 and the second matrix 32 and deciding.Four angles in the preferred main body flow passage structure 33 be arc chord angle 331 structures in order to avoid stress is concentrated, and this structure also helps enhancing intensity, can also resist to a certain extent the fatigue impact that the operation fluctuation brings simultaneously, and then the life-span of extension device.
Concrete, fin 311,321 be sheet shape fin 311,321, columniform fin 311,321 and conical fin 311,321 in the combination of any or they.The fin 311, the 321st of sheet shape, traditional version, the fin 311 of pref. cylindrical, 321 or conical fin 311,321, can more be conducive to fin 311,321 casting forming and the afterwards cleaning of inner molding sand of casting, also be conducive to move rear Integral cleaning to enclosure interior simultaneously.When arranging, the fin 311 of sheet shape, 321 length direction are consistent with the runner direction of housing, so more are conducive to from shell end the molding sand of the rear inside of casting be cleared up, after also being conducive to move to the cleaning of enclosure interior.
Concrete, the fin 311,321 that is arranged in main body flow passage structure 33 is columniform fin 311,321 and the combination of conical fin 311,321 any or they.Be conducive to fin 311,321 casting forming and the afterwards cleaning of inner molding sand of casting, also be conducive to move rear Integral cleaning to enclosure interior simultaneously.
Concrete, heat exchange element is provided with one deck or the above heat exchange element of one deck, and a plurality of casting fin heat exchange units in every layer of heat exchange element closely are connected in series.Syndeton is simple, and convenient operation.Every layer of heat exchange element supports with steelframe and separates, the flow passage structure that is comprised of heat exchange element and housing includes totally three kinds of the streams that crawls (dotted line as shown in Figure 6, air flows out from air outlet slit 4 along flowing shown in the dotted line from air intake 6) of the backflow (air flow process as shown in Figure 1) of direct current (flue gas flow as shown in Figure 1), two journey С of one way and multipass from bottom to top.Adopt multipaths as shown in Figure 6 can prolong flow process, increase heat exchanger time, thereby so that heat exchange is abundant.
Concrete, the bolt sealing structure that is provided with groove 343 by sealing surface between the casting fin heat exchange unit is mutually assembled and is tightly connected.Casting fin heat exchange unit is mutually to be assembled into the runner that consists of another heat transferring medium by bolt sealing structure between casting fin heat exchange unit, this bolt sealing structure includes bolt hole 341, bolt and nut 342, with two adjacent bolt hole 341 alignment of casting the matrix of fin heat exchange units, be tightly connected with bolt and nut 342 during assembling.Simultaneously, for more closely sealing, matrix at two adjacent casting fin heat exchange units is offered corresponding groove 343, during assembling, be tightly connected with the bolt sealing structure assembling after two grooves, 343 alignment with two correspondences, setting up groove 343 so that also can not there be the problem of leakage in air when this flow process flows.
Concrete, the first matrix 31 of the main body flow passage structure 33 in a plurality of casting fin heat exchange units equates setting with distance between the second matrix 32.Mould is unified, is convenient to industrialized mass production.
The present invention can be used in the smoke pre-heating recovery system of the newly-built or all kinds of devices transformed of oil plant, the structural principle that it is new and manufacturing technology can overcome the leakage shortcoming of legacy equipment comprehensively, effectively prolong the life cycle of single devices, reduce the inspection and maintenance expense, to play good effect for all kinds of unit furnaces are partly energy-saving and cost-reducing, will also produce significant economic benefit.
The casting fin heat exchange unit of Self-closing type integral-casting air preheater of the present invention is made heat exchange unit by traditional mode of production, because casting fin heat exchange unit is the continuous entity structure of self-isolation still not, but also be with two-way fin 311,321, so that the casting difficulty is large, therefore, only depend on traditional up and down two secondary moulds to be difficult to finish the casting of casting fin heat exchange unit, just can water and cast out this structure but will make respectively three layers of sand mo(u)ld of upper, middle and lower.Concrete steps are as follows:
At first, upper die and lower die are to adopt essentially identical structure, and the intermediate layer sand mo(u)ld solves fin 311,321 Problems in formings in the main body flow passage structure 33.
Secondly, the molding sand after the casting in the cleaning casting fin heat exchange unit need manufacture and design special instrument, should remove the sand of depths in the fin ring, can not bump disconnected inner fin 311,321 simultaneously.
The 3rd, to the heat treatment of annealing of casting fin heat exchange unit, the residual stress that causes because casting cold scarce inequality to eliminate its inside.
The 4th, casting fin heat exchange unit is carried out the shot blasting on surface compaction treatment, improve case hardness, denude with resistance to erosion.Note control spray surging, in order to avoid wound or sever fin 311,321.
The 5th, the permeability of casting the fin heat exchange unit in the special frock that arranges detects.
The 6th, the sealing surface of casting the fin heat exchange unit is carried out groove 343 processing, improve quality of fit, with anti-leak.
The 7th, two casting fin heat exchange units are assembled into together by bolt sealing structure, the nut 342 of bolting on step by step, attention is not tightened to peak torque load on wanting once, but will divide for three to four steps progressively tightened.Namely consist of a heat exchange element module after being assembled into the quantity that together unit reaches designing requirement.
The 8th, carry out a property detection of oozing of module in the special frock that arranges, sealing surface is carried out air seal test, carry out the static test of worst hot case after qualified.
The 9th, the whole Self-closing type integral-casting air preheater after the assembling carries out air seal test between heat exchange element module and the housing in the special frock that arranges.
In addition, can also adopt four layers of sand mo(u)ld of manufacturing to water and cast out casting fin ring element.Be specially the casting pattern of ground floor sand mo(u)ld and the similar conventional cast fin plate of second layer sand mo(u)ld, this can cast out the first half of fin ring to model; The 3rd layer of sand mo(u)ld and the 4th layer of sand mo(u)ld be the casting pattern of similar traditional fin plate also, and this can cast out the Lower Half of fin ring to model.Therefore, as long as successively these four layers of sand mo(u)lds successively closed assembly are got up, can water the casting fin heat exchange unit that casts out a structural integrity.Take the method, mould originally only needs to change a little, and only production stage is some more.
Embodiment 2
Two of the specific embodiment of Self-closing type integral-casting air preheater of the present invention, the main technical schemes of present embodiment is identical with embodiment 1, and unaccounted feature adopts the explanation among the embodiment 1 in the present embodiment, no longer gives unnecessary details at this.The difference of present embodiment and embodiment 1 is, the first matrix 31 of the main body flow passage structure 33 in a plurality of casting fin heat exchange units and the unequal setting of distance between the second matrix 32.The air velocity heat exchanging effect of skimming over fin 311,321 surfaces has obvious impact, if heat exchange unit is more in same casting air preheater, what the runner flow process was walked is the shape of crawling that constantly is folded to, fluid head has certain loss in such cases, this moment can be by adjusting different the first matrix 31 of fin heat exchange units and the spacings between the second matrix 32 of casting, the spacing of the casting fin heat exchange unit that is positioned at the back is narrowed down gradually, the convergent flow area, thus keep flow velocity constant.
Should be noted that at last; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although with reference to preferred embodiment the present invention has been done to explain; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement technical scheme of the present invention, and not break away from essence and the scope of technical solution of the present invention.
Claims (10)
1. Self-closing type integral-casting air preheater, include housing, smoke inlet, exhanst gas outlet, air intake, air outlet slit, and be arranged at heat exchange element in the described housing, it is characterized in that: described heat exchange element includes a plurality of casting fin heat exchange units, described casting fin heat exchange unit includes the first matrix, the second matrix, and the fin that lays respectively at the both sides, middle part of the both sides, middle part of described the first matrix and described the second matrix, described the first matrix links to each other also integrally casting moulding and forms circulus with described the second matrix in both ends, described the first matrix and described the second matrix form the main body flow passage structure in the middle part.
2. Self-closing type integral-casting air preheater according to claim 1, it is characterized in that: described main body flow passage structure is that cross section has close-shaped main body flow passage structure.
3. Self-closing type integral-casting air preheater according to claim 2, it is characterized in that: described main body flow passage structure is the main body flow passage structure that cross section has rectangle.
4. Self-closing type integral-casting air preheater according to claim 3, it is characterized in that: described cross section has four combinations that the angle is arc chord angle or right angle and arc chord angle of the main body flow passage structure of rectangle.
5. Self-closing type integral-casting air preheater according to claim 1 is characterized in that: described fin is one or any two kinds combination in the fin of sheet shape, columniform fin and the conical fin or three kinds combination.
6. Self-closing type integral-casting air preheater according to claim 5 is characterized in that: the described fin that is arranged in described main body flow passage structure is any one or two kinds of combinations of columniform fin and conical fin.
7. Self-closing type integral-casting air preheater according to claim 1 is characterized in that: described heat exchange element is to be provided with one deck or the above heat exchange element of one deck, and a plurality of casting fin heat exchange units in every layer of heat exchange element closely are connected in series.
8. Self-closing type integral-casting air preheater according to claim 7 is characterized in that: by sealing surface reeded bolt sealing structure is set between the described casting fin heat exchange unit and mutually assembles and be tightly connected.
9. Self-closing type integral-casting air preheater according to claim 1 is characterized in that: the first matrix of the main body flow passage structure in described a plurality of casting fin heat exchange units and the distance between the second matrix arrange for equidistant.
10. Self-closing type integral-casting air preheater according to claim 1 is characterized in that: the first matrix of the main body flow passage structure in described a plurality of casting fin heat exchange units and the distance between the second matrix are different from arranging.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102138173A CN102313294B (en) | 2011-07-29 | 2011-07-29 | Self-closed integrally cast air preheater |
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| CN2011102138173A CN102313294B (en) | 2011-07-29 | 2011-07-29 | Self-closed integrally cast air preheater |
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| CN102313294B true CN102313294B (en) | 2013-05-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106969374A (en) * | 2017-04-28 | 2017-07-21 | 北京拓首工业炉股份有限公司 | A kind of combined air air preheater |
| CN106979535A (en) * | 2017-04-28 | 2017-07-25 | 北京拓首工业炉股份有限公司 | A kind of combined air air preheater with denitration function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2041803U (en) * | 1988-09-27 | 1989-07-26 | 张国祥 | Cast iron air preheater |
| CN201355050Y (en) * | 2009-02-27 | 2009-12-02 | 溧阳市恒祥特钢机械制造有限公司 | Bidirectional double-fin cast slab type air preheater |
| CN201593803U (en) * | 2009-09-04 | 2010-09-29 | 中国石油化工集团公司 | Flue gas low temperature corrosion resistant efficient air preheater |
| CN202195499U (en) * | 2011-07-29 | 2012-04-18 | 茂名重力石化机械制造有限公司 | Self-closing type integral-casting air preheater |
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Address after: 525024 Guangdong City, Maoming Province Ring West Road, No. 91 Patentee after: Maoming gravity Petrochemical Equipment Co Ltd Address before: 525024 Maoming City, Guangdong Province West Road, Maoming City, the gravity of the Petrochemical Machinery Manufacturing Co., Ltd., Patentee before: The Challenge Petrochemical Machinery Corporation |