CN101858604A - Anti-failure structure for cast iron air preheater and key process thereof - Google Patents
Anti-failure structure for cast iron air preheater and key process thereof Download PDFInfo
- Publication number
- CN101858604A CN101858604A CN200910129972A CN200910129972A CN101858604A CN 101858604 A CN101858604 A CN 101858604A CN 200910129972 A CN200910129972 A CN 200910129972A CN 200910129972 A CN200910129972 A CN 200910129972A CN 101858604 A CN101858604 A CN 101858604A
- Authority
- CN
- China
- Prior art keywords
- fin
- air preheater
- cast
- cast iron
- fin plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
Abstract
The invention relates to an anti-failure structure for a cast iron air preheater and a key process thereof, which can slow down failures such as thermal stress cracking, stress corrosion cracking, erosion corrosion, deformed sealing leakage and the like. A major structure comprises a shell, an elastic sealing system and cast iron fin-plate heat exchange elements, and the anti-failure structure is characterized in that: sponge type metal wires are filled in a flue gas inlet end to enlarge heat-exchange areas, protect fins against the erosion of flue gas, obstruct granular impurities in the flue gas, homogenize inlet airflow and replace and clean conveniently; a primary seal between two flows consists of a concave-convex groove, a wavelike elastic leaf metal on the groove bottom and heated expansion bars filled in the groove, a planar auxiliary seal and a sliding sleeve auxiliary seal in the middle of a fin plate are arranged additionally to form a set of high-elasticity and fluctuation-resisting compound seal system; a gradient area type flow channel for supplementing the increase and decrease in the two flows enables the pressure of both sides of the fin plate to be balanced and maintains kinetic energy; and the manufacturing process for arc corners and the fin plate at the periphery of the flow channel improves the performance of heat deformation cracking resistance and erosion resistance of the cast iron air preheater. New products are particularly suitable for preheating air in heating furnaces.
Description
1, technical field
The present technique patent of invention is about the anti-failure structure of cast-iron air preheater and critical process thereof, belongs to the high efficient heat exchanging energy-saving equipment of heat exchange special equipment in the mechanized equipment engineering.The heat exchange that specifically can be used for petroleum refining and chemical industry, Coal Chemical Industry, chemical fertilizer, air-conditioning, air cooling, electric power facility equipment or the like requires, comprise to application modes such as medium heating or coolings, be particularly suitable for the flue gas waste heat recovery equipment of petrochemical heating furnace, allow combustion air reach the purpose of preheating.
2, background technology
The waste heat of flue gas of heating furnace reclaimer is air preheaters such as tubular type (turbolator), heat pipe-type, hydro-thermal matchmaker, board-like, cast iron type, and they respectively have characteristics, and usually, the technical parameter of air preheater is:
1) air side maximum stream flow≤8.0kg/s, combustion gas side maximum stream flow≤5.0kg/s;
2) air side maximum pressure (total head)≤0.6MPa, combustion gas side maximum pressure (total head)≤2.0MPa;
3) combustion gas side maximum temperature≤650 ℃, combustion gas side minimum temperature 〉=150 ℃.
The flow process of air preheater in device as shown in Figure 1, here the explanation be cast iron type fin plate air preheater.
(1) structure of traditional cast-iron air preheater and function
The installation form of cast iron type fin plate air preheater can freely determine as required, both can be horizontal, vertical, and also tilting is installed, but more with horizontal installation.Being the air preheater of (fin) vertical installation and operation as shown in Figure 2, is the cuboid structure generally.
Reference diagram 2, Fig. 3 and pictorial diagram 4, Fig. 5, its basic structure is: the highly effective air preheater of this anti-flue gas low-temperature corrosion, comprise preheater shell, elastic sealing structure and cast iron fin plate shape heat exchange element, the cast iron fin plate is made up of substrate and fin, the cast iron fin plate connects by bolted shown in Figure 5 between any two, and its architectural feature is: the material of described heat exchange element is a cast iron; Substrate adopts plane or undaform; Fin is discontinuous, and the outline of the shape of its single fin can be rectangle or ligulate or fan-shaped or circular or aciculiform, or the like.Cross section can be and flows spindle line style or the streamlined or flat bow type of part spindle fully, or the like.The fin height of heat exchange element is contour or the not contour or highly distribution of mixing of 8-80mm; Fin density is contour or the equidistant or mixing spacing distribution of 5-110mm; Fin thickness is 2-8mm.Arranging of the fin of heat exchange element is block form, or alternating expression, or eccentric alternating expression, or the like.
Reference diagram 2, Fig. 3 and pictorial diagram 4, Fig. 5, its basic function is: still with the flue gas of low temperature exhaust heat from top rectangular opening high speed suck air preheater, after to the heat release of fin heat exchanger plates, be sucked out from air preheater bottom rectangle opening.Air flow process then is divided into two journeys, compress at a high speed from the rectangular aperture of air preheater right side Lower Half, finish a journey behind the rectangle cover plate on the left of level flows to, 90 ° of turnovers are upwards flowed along cover plate then, the rectangular aperture that level flows to the air preheater right side first half after 90 ° of turnovers flows out again, finish second journey, in this two journey, air absorbs heat from the fin heat exchanger plates.Total is that flue gas flows from top to bottom, and air-flow direction is vertical with the flow of flue gas direction.
(2) problem of traditional cast-iron air preheater existence
The problem that erosion corrosion tradition cast-iron air preheater exists, except the dew point corrosion phenomenon of fume side, also there is the problem of erosion corrosion in its import fin, as shown in Figure 6., fracture smooth degree comprehensive analysis and judgement new and old according to site examining and repairing observation report and fin fracture, erosion is the import regional area during beginning, along with forward's fin by erosion, become forward's fin immediately following thereafter fin, make washed out fin scope inwardly enlarge gradually like this from port.After more fin was by erosion, heat exchange area reduces, flow perturbation reduces influenced the heat exchange effect, reduces the thermal efficiency of heating furnace.
Comparatively speaking, the corrosion of air side and erosion phenomenon are less.In order to prevent erosion, people improve cast iron quality, directly add wear-resisting elementary composition when molten steel is smelted, and perhaps smear at the position of the easy erosion of casting finished products and infiltrate wear-resisting elementary composition, and are little but the cost rising is but produced effects.Particularly, though element silicon can improve corrosion resistance, long term high temperature forms graphitization down easily, has reduced intensity, and its quenching degree is less, is difficult to improve hardness by heat treatment.
Just there are irregular phenomenons such as crosswise concaving in thermal deformation cracking large scale fin plate ironcasting blank, powerful assembling is contained it certain internal stress, if be superimposed with the thermal stress of expanding with heat and contract with cold after the air preheater operation, just be easy to make the distortion of cast iron fin plate, sealing leak, heat exchange efficiency reduces, serious then cracking, equipment failure.As shown in the figure.
Dew point corrosion can produce the sulfuric acid low temperature dew point corrosion under the sulfur-containing smoke gas environment, on the low side when temperature, the aqueous vapor in the flue gas becomes sulfuric acid at the wall globule that congeals into behind the dissolving sulfur-containing impurities, produces corrosion.Air preheater fume side inducer erosion corrosion for many years and low-temperature zone dew point corrosion problem are the bottlenecks of this equipment long-time running.Air preheater at present commonly used mostly is tubular type (turbolator), heat pipe-type, hydro-thermal matchmaker, board-like, cast iron type etc., because the material of heat exchanger components mostly is the matured product of each steel mill, its anti-dew point corrosion is limited in one's ability.Dew point corrosion phenomenon about various air preheaters; Except that plate air preheater, also there is the low problem of heat exchange efficiency in the air preheater of other versions.Though plate air preheater heat exchange efficiency height, its requirement to fuel is very high.Because the thermal efficiency of heating furnace that erosion corrosion and thermal deformation cracking causes reduces, and may make that the temperature of low-temperature zone is lower, cause dew point corrosion easilier, form vicious circle.Domestic ND steel (09CrCuSb) has sulfuric-resisting low-temperature dew point corrosion ability preferably at present, but material cost is higher.
The problem that tradition cast iron type fin plate air preheater exists also is the problem that other forms of air preheater more or less exists, and this shows, improves in conjunction with the problem of its existence, has very strong engineering significance.
(3) technical thought of the traditional cast-iron air preheater of improvement
Analyze the mechanism of action of various corrosion of fume side fin and inefficacy, different phenomenons are the continuous problems of both having had any different, dew point corrosion mainly is the stress corrosion cracking fracture that hydrogen sulfide class impurity concentrates the place to cause in the fin Root Stress in the flue gas, mainly to be grit wash away the physics of soft cast iron open texture in erosion corrosion, but this physical process is mainly caused by operation.Though and the thermal deformation cracking also is a physical process, outside the Pass having with operation, also relevant with the forced seal form of product, two kinds of inefficacies then are also relevant with material and structural strength, need solve from manufacturing process.To this, should take different technical thought respectively.
Improve fluidised form by designing new runner, strengthen the heat transfer of air and high-temperature flue gas, optimize heat exchange, fully reduce flue-gas temperature, fuel saving consumption.
By the design of optimizing structure, reduce various corrosion of fume side and air side and kinetic energy consumption, subtract and change the damage that it impacts suddenly.
By improving the manufacturing process of fin heat exchanger plates, make fin plate cast sturcture closely solid, the stress of reduction fin root is concentrated the residual stress with the monoblock heat exchanger plates, improves the surface smoothing fineness of fin plate, delay the corrosion of flue gas acid dew point, prolong the service life of heat transmission equipment.
3, summary of the invention
The invention relates to a kind of highly effective air preheater and critical process thereof of anti-flue gas erosion, this preheater also can slow down inefficacies such as thermal stress-cracking, stress corrosion cracking, erosion corrosion and deformable seal leakage.Its basic structure comprises preheater shell, elastic sealing structure and cast iron fin plate shape heat exchange element, and the cast iron fin plate is made up of substrate and fin, and its architectural feature is: the material of described heat exchange element is a cast iron; Substrate adopts plane or undaform; Fin is discontinuous, and the outline of the shape of its single fin can be rectangle or ligulate or fan-shaped or circular or aciculiform, or the like; Cross section can be and flows spindle line style or the streamlined or flat bow type of part spindle fully, or the like; The fin height of heat exchange element is contour or the not contour or highly distribution of mixing of 8-80mm; Fin density is contour or the equidistant or mixing spacing distribution of 5-110mm; Fin thickness is 2-8mm.Arranging of the fin of heat exchange element is block form, or alternating expression, or eccentric alternating expression, or the like.Its principal character is: the gas approach end is filled with multi-functional sponge-type metal, forms the elastomeric sealing system of a cover by major-minor sealing and auxiliary seal between two flow processs.
It is as follows further to specify its feature:
(1) though the shell of flue gas and air two flow processs is rectangular configuration, but the runner in the cross section is not a rectangular configuration completely, its four angles of specifically approximate rectangular runner are not 90 ° of sharp-pointed angles, but Fig. 4 and the corner that has obvious circular arc shown in Figure 7, its circular arc is not less than 20mm in general, both avoid stress to concentrate, improved gas flow pattern again.
(2) as schematic diagram 7 and pictorial diagram 8, shown in Figure 9, portion of gas approach end office (EO) zone filling sponge broken nitre of type metal or metal fibre agglomerate 1 are avoided the erosion corrosion of high-temperature flue gas with the protection fin, and stop the granule foreign in the flue gas.The big or small thickness of broken nitre of these sponge-type metal or metallic fiber is determined by specific design, the broken nitre of thin especially metal can be wrapped in the woven wire, the broken nitre of big metal can directly loose and fill out between fin, big metallic fiber shown in Figure 8 can be directly laterally or vertically pendulum fill out between fin, the thin especially metallic fiber shown in Figure 9 shape plug that can knead is filled out between fin.Sponge-type metal is equivalent to the pin wing of countless solid matters, has increased heat exchange area significantly.Because entrance point is a non-circular structure, sponge-type metal also has the effect of even distribution inlet air flow.For being convenient for changing cleaning, these sponge-type metal can also be arranged to box-packed structure or be compressed into block structure shown in Figure 10.
Metallic fiber was the iron filings that metal cutting is come out in the machining originally, generally be the strip that spiral is rolled, different in size, originally all be to become this iron filings compacted the batching that is re-used as steel-making behind the piece to melt down use, here turn waste into wealth, reduced the implementation cost of new technology.
(3) still as shown in Figure 7; periphery sealing between the cast iron fin plate is the elastomeric main double containment 2 of a cover, secondary sealing 3 and auxiliary seal 4 hybrid systems; expanded graphite bar primary seal by tongue and groove and filling thereof is separated flue gas and air two media; the graphite bar can be with thermal expansion; in dynamic operation, keep sealing load; the secondary honey envelope of male and fomale(M﹠F) plays the effect of protection primary seal, and the bolt and nut pair 5 that connects sealing has increased elastomeric pad 6, further relaxes thermal stress.Auxiliary seal element 4 not necessarily is determined on a case-by-case basis.In general, for the air preheater of fin plate area greater than 1 square metre, the centre position of fin plate area can be provided with some sliding sleeve bearings, can lay flexible member in the sliding sleeve bearing, the total height of flexible member exceeds the runner height, and flexible member is pushed down in the layer upon layer of assembling of fin plate back.The large-scale sheet ironcasting is comparatively fragile, and there has been the support of flexible member the centre, has improved the rigidity of plate-shaped cast iron fin plate, slows down its be heated flexible deformation or damage when being subjected to impact suddenly.
(4) flow process of flue gas and air two media all is variable section runner structures.Gradually narrow type runner is fit to the contraction after the flue gas heat release cooling, and is gradually narrow and flow velocity that promote can remedy because entrance point is filled the kinetic energy rejection that the metal inhibition causes; Gradually wide type runner is fit to the expansion after the air heat absorption heats up.The structure of gradually narrow type runner and gradually wide type runner plays the complementation of circulation area increase and decrease, and the flow process pressure of cast iron fin plate both sides flue gas and air two media is tended to balance, and the cast iron fin plate can not be subjected to the pressure medium effect substantially.The cross section of fluid channel size mainly thickness of height, thickness, density and the substrate by fin designs to regulate and realizes.
(5) air preheater is heavier, for control gas shock vibration generally is installed in ground with it, but flue gas is from nearly 20 meters high furnace roofs, therefore gas flue therebetween not necessarily moves towards completely anyhow, for the minimizing energy consumption often is smooth tiltedly curved direction, increased difficulty for the engineering connection of interface.As shown in Figure 2, the mounting bracket both sides of air preheater have nut screw mandrel adjustment structure, adjusting whole air preheater on the one hand makes its cast iron fin plate become a low-angle with level, the rainwater that convenient leakage is advanced or the discharge of wash water, be connected with the accurate of front and back air flue when conveniently installing on the other hand.
(6) solid technology and precise machining process are taked in the production of cast iron fin plate blank.At first, science design wooden model and Sha Mo, reasonable Arrangement casting gate and cap mouth; Secondly, be not static casting in casting cycle, but the vibration casting that is to say suitable mechanical oscillation casting die in casting, make molten steel fully mobile and intensive; The 3rd, cast iron fin plate blank is carried out the shot blasting on surface shock compaction handle; At last, the concavo-convex seal groove between the cast iron fin plate to reduce the distortion of concavo-convex seal groove, carries out precision optical machinery processing, to improve quality of fit again at its rough annealing stress-relieving by beat treatment.
In addition, in products instruction, clearly propose the parameter area and the frequency of limit air preheater elastic operation, avoid changing repeatedly technological parameter and cause the fluctuation of sealing system lax.
The conventional air preheater is extensively used in various oil refining, chemical industry, chemical fertilizer plant muchly, and has produced huge economic benefit.The art of this patent can be used in the smoke pre-heating recovery system of the newly-built or all kinds of devices transformed of oil plant, structural principle that it is new and manufacturing technology can overcome many shortcomings of legacy equipment comprehensively, effectively prolong the life cycle of single devices, reduce maintenance and maintenance cost, to play good effect for all kinds of unit furnaces are partly energy-saving and cost-reducing, will also produce remarkable economic efficiency.In recent years, along with crude oil poor qualityization and energy crisis, country strengthened the management to energy-saving and emission-reduction, and enterprise pays much attention to high efficient heat exchanging new technology and application thereof in enhancing efficiency by relying on tapping internal latent power, and this application for this patented technology provides good condition.
4, description of drawings
Shown in Figure 1 is the schematic flow sheet of petrochemical heating furnace, and air preheater is installed in ground.
Shown in Figure 2 is the outward appearance schematic flow sheet of cast-iron air preheater, and flue gas flows from top to bottom, and air-flow direction is vertical with the flow of flue gas direction.
Shown in Figure 3 is the schematic flow sheet of the inside, cast-iron air preheater cross section of Fig. 2, and the both sides flow process all is modes in parallel again after multichannel is disperseed.
Shown in Figure 4 is one group of cast iron fin plate simulating piece pictorial diagram, only is used for foundry trial research.Thin portion structure comprises 1 substrate, 2 fins, 3 flue gas flow channels, 4 air flow channels, 5 hermetically-sealed constructions, 6 circular arc corners.
Shown in Figure 5 is many group cast iron fin plate modules pictorial diagram that are stacked up and down, only is used for leakage test research.Thin portion structure comprises 1 bolt and nut, and 2 sealing surfaces, 3 fins, 4 substrates, mark 5 are pointed out to have occurred visible slight deformation in the middle of the fin plate.
Shown in Figure 6 is a block casting iron fin plate pictorial diagram, and the most of fin that is installed in import one end is by erosion, and the fin of erosion fracture and inhomogeneous, and when air-flow entry port section was described, it was uneven that its fluidised form distributes.
Shown in Figure 7 is two fragments of stress corrosion fracture, can judge that from the form of fragment its position is the close bolt seal of periphery, and both the maximum stress place of forced seal existed.
Shown in Figure 8 is the principal character schematic diagram of patent of the present invention, comprises 1 sponge metal, 2 primary seals, 3 secondary sealings, 4 flexible members, 5 bolt and nuts, 6 elastomeric pads, 7 circular arc corners, 8 substrates, 9 fins.
Shown in Figure 9 is that the thicker directly horizontal pendulum of 3 wire 1 is filled out between fin 2.
Shown in Figure 10 is a wire fiber cuboid, is formed by the compression of wire coma, is suitable for independently being installed in the gas approach of air preheater.
Shown in Figure 11 is a kind of wire coma of special elongated flexible, is suitable for being packed between the fin.
Shown in Figure 12 is a kind of thin and short wire coma, is suitable for being packed between the fin, also is suitable for making wire fiber cuboid shown in Figure 10.
Shown in Figure 13 is a kind of thin and long bent wire coma, is suitable for being packed between the fin, also is suitable for making
Wire fiber cuboid shown in Figure 10.
Shown in Figure 14 is a kind of thick and long bent wire coma, is suitable for the strip ornaments between fin.
Shown in Figure 15 is a kind of thin and wire coma long and that spiral is coiled is suitable for the strip ornaments between fin.
5, the specific embodiment
Compare with traditional cast-iron air preheater, the change of structural design is big and be all very crucial, and the optimization of manufacturing process technology then is the indispensable part of the present invention, below in conjunction with embodiment and accompanying drawing, the present invention is further illustrated, but embodiments of the present invention are not limited thereto.
At first, make monolithic cast iron fin plate, note guaranteeing respectively to turn radius of corner by traditional mode of production.
Secondly, to the heat treatment of annealing of monolithic cast iron fin plate, to eliminate its inside because of casting the residual stress that cold scarce inequality causes.
The 3rd, monolithic cast iron fin plate is carried out the shot blasting on surface compaction treatment, improve case hardness, wash away abrasion with anti-.Note control spray surging, in order to avoid wound or sever fin.
The 4th, monolithic cast iron fin plate is carried out sealing surface fine finishining, improve quality of fit, with anti-leak.
The 5th, assemble a pair of cast iron fin plate, on the special frock that is provided with, carry out a property detection of oozing of body, sealing surface is carried out air seal test, carry out the static withstand voltage test of normal temperature after qualified, simulate the dynamic test of worst hot case at last.
The 6th, by special explained hereafter metallic fiber.Metallic fiber is exactly the iron nitre that metal cutting is come out in the machining, and the shape thickness of fiber and length are curved straight, and to add the Several Factors such as feed speed of lathe tool in man-hour relevant with turning, but work in-process is controlled.Figure 10 to Figure 14 is not from carefully having showed five kinds of metal fibre agglomerates to rough segmentation.
The 7th, the sponge grease coma to assembling on the special frock that is provided with carries out the high temperature gas flow washout test, but by design code detect the sponge grease coma be compressed distortion should resilience, volume-diminished is not more than original 10% and is.
The 8th, on a pair of cast iron fin plate of entrance point, load the metallic fiber bits, the material of metallic fiber bits and the thickness length of shape thereof are curved straight, should be selected by design according to the height density of fin
The 9th, assembling cast-iron air preheater integral body, if preheater is become by the long-pending bigger fin plate closed assembly of a lot of aspects as shown in Figure 5, it should be noted that from bottommost to top each piece fin plate its suffered above gravity to the influence of sealing, for keeping the suitable elasticity of sealing, bolt force should be treated with a certain discrimination.After finishing, assembling on the special frock that is provided with, carries out the air seal test of apparatus body and sealing surface.
Present embodiment is except that following technical characterictic, and other parts change " assembling sponge grease coma " into " load metallic fiber bits " in the 8th step among embodiment 1: the embodiment 1, re-uses after just the iron filings compacted being become piece.
The foregoing description is a preferred implementation of the present invention, but embodiments of the present invention are not restricted to the described embodiments, for example, the metallic fiber iron filings that metal cutting in the machining is come out are applied on the close plate type heat exchanger of structure shown in Figure 15 for the purpose of protection against erosion or uniform air flow, or are applied on other equipment or the pipeline.In a word, other any do not deviate from change, the modification done under spiritual essence of the present invention and the principle, substitutes, combination, simplify, and all should be the substitute mode of equivalence, is included within protection scope of the present invention.
Claims (8)
1. about a kind of anti-failure structure and critical process thereof of cast-iron air preheater, this preheater can slow down inefficacies such as thermal stress-cracking, stress corrosion cracking, sweep of gases corrosion and deformable seal leakage.Its basic structure comprises preheater shell, high resiliency sealing system and cast iron fin plate shape heat exchange element, and the cast iron fin plate is made up of substrate and fin, and the material of specifically described heat exchange element is a cast iron; Substrate adopts plane or undaform; Fin is discontinuous, and the outline of the shape of its single fin can be rectangle or ligulate or fan-shaped or circular or aciculiform, or the like; Cross section can be and flows spindle line style or the streamlined or flat bow type of part spindle fully, or the like; The fin height of heat exchange element is contour or the not contour or highly distribution of mixing of 8-80mm; Fin density is contour or the equidistant or mixing spacing distribution of 5-110mm; Fin thickness is 2-8mm.Arranging of the fin of heat exchange element is block form, or alternating expression, or eccentric alternating expression, or the like.Its principal character is: the gas approach end is filled with multi-functional sponge-type metal, forms the elastomeric triple compound seal of cover system by major-minor sealing and auxiliary seal between two flow processs.
2. about a kind of anti-failure structure and critical process thereof of cast-iron air preheater, it is characterized in that: though the shell of flue gas and air two flow processs is rectangular configuration, but the runner in the cross section is not a rectangular configuration completely, its four angles of specifically approximate rectangular runner are not 90 ° of sharp-pointed angles, but have the corner of obvious circular arc, its circular arc is not less than 20mm in general, has both avoided stress to concentrate, and improves gas flow pattern again.
3. about a kind of anti-failure structure and critical process thereof of cast-iron air preheater; it is characterized in that: the periphery sealing between the cast iron fin plate is the elastomeric major-minor double seal system of a cover; separate flue gas and air two media by the undaform resilient blade of tongue and groove, bottom land and the expanded graphite bar primary seal of filling thereof; the secondary honey envelope of male and fomale(M﹠F) plays the effect of protection primary seal; the bolt and nut pair that connects sealing has increased spring shim, further relaxes thermal stress.
4 anti-failure structure and critical processes thereof about a kind of cast-iron air preheater, it is characterized in that: the high resiliency sealing system also comprises the auxiliary seal element, for the air preheater of fin plate area greater than 1 square metre, the centre position of fin plate area can be provided with some sliding sleeve bearings, can lay flexible member in the sliding sleeve, the free height of flexible member exceeds fin top, flexible member is pushed down in the layer upon layer of assembling of fin plate back, there is the support of high temperature resistant flexible member the centre, improve the rigidity of plate-shaped cast iron fin plate, slowed down its be heated flexible deformation or damage when being subjected to impact suddenly.
5. about a kind of anti-failure structure and critical process thereof of cast-iron air preheater; it is characterized in that: portion of gas approach end office (EO) zone filling sponge broken nitre of type metal or metal fibre agglomerate; avoid the erosion corrosion of high-temperature flue gas with the protection fin, and stop the granule foreign in the flue gas.The big or small thickness of broken nitre of these sponge-type metal or metallic fiber is determined by specific design, the broken nitre of thin especially metal can be wrapped in the woven wire, the broken nitre of big metal can directly loose and fill out between fin, the thin especially metallic fiber shape plug that can knead is filled out between fin, big metallic fiber can be directly laterally or vertically pendulum fill out between fin.Sponge-type metal is equivalent to the pin wing of countless solid matters, has increased heat exchange area significantly.Because entrance point is a non-circular structure, sponge-type metal also has the effect of even distribution inlet air flow.For being convenient for changing cleaning, these sponge-type metal can also be arranged to box-packed structure.
6. about a kind of anti-failure structure and critical process thereof of cast-iron air preheater, it is characterized in that: the flow process of flue gas and air two media all is variable section runner structures.Gradually narrow type runner is fit to the contraction after the flue gas heat release cooling, and is gradually narrow and flow velocity that promote can remedy because entrance point is filled the kinetic energy rejection that the metal inhibition causes; Gradually wide type runner is fit to the expansion after the air heat absorption heats up.The structure of gradually narrow type runner and gradually wide type runner plays the complementation of circulation area increase and decrease, and the flow process pressure of cast iron fin plate both sides flue gas and air two media is tended to balance, and the cast iron fin plate can not be subjected to the pressure medium effect substantially.
7. about a kind of anti-failure structure and critical process thereof of cast-iron air preheater, it is characterized in that: solid technology is taked in the production of cast iron fin plate blank.On the one hand, be not static casting in casting cycle, but the vibration casting that is to say suitable mechanical oscillation casting die in casting, molten steel is fully flowed with intensive; On the other hand, cast iron fin plate blank being carried out the shot blasting on surface shock compaction handles.
8. about a kind of anti-failure structure and critical process thereof of cast-iron air preheater, it is characterized in that: the concavo-convex seal groove between the cast iron fin plate carries out precision optical machinery processing again behind its rough annealing stress-relieving by beat treatment, to improve quality of fit.
9. about a kind of anti-failure structure and critical process thereof of cast-iron air preheater, it is characterized in that: the mounting bracket both sides of air preheater have nut screw mandrel adjustment structure, adjusting whole air preheater on the one hand makes its cast iron fin plate become a low-angle with level, the rainwater that convenient leakage is advanced or the discharge of wash water, be connected with the accurate of front and back air flue when conveniently installing on the other hand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910129972A CN101858604A (en) | 2009-04-10 | 2009-04-10 | Anti-failure structure for cast iron air preheater and key process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910129972A CN101858604A (en) | 2009-04-10 | 2009-04-10 | Anti-failure structure for cast iron air preheater and key process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101858604A true CN101858604A (en) | 2010-10-13 |
Family
ID=42944658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910129972A Pending CN101858604A (en) | 2009-04-10 | 2009-04-10 | Anti-failure structure for cast iron air preheater and key process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101858604A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121707A (en) * | 2011-04-22 | 2011-07-13 | 茂名重力石化机械制造有限公司 | Air preheater for cast iron on high-head fins |
| CN102155745A (en) * | 2011-04-22 | 2011-08-17 | 茂名重力石化机械制造有限公司 | Cast iron air preheater |
| CN102291857A (en) * | 2011-07-26 | 2011-12-21 | 冯忠和 | Universal electrode heater |
| CN102297441A (en) * | 2011-06-03 | 2011-12-28 | 河北二十冶工程技术有限公司 | Cooling sealing device of cooling dead zone of evaporative cooling flue |
| CN106090989A (en) * | 2016-08-09 | 2016-11-09 | 瑞切尔石化设备（上海）有限公司 | A kind of elastic pressuring clamping device for plate air preheater |
| CN109185913A (en) * | 2018-09-18 | 2019-01-11 | 北京质为科技有限公司 | A kind of air preheater preventing clogging up device |
| CN109612311A (en) * | 2019-01-17 | 2019-04-12 | 广东环葆嘉节能科技有限公司 | A kind of heat-exchanging component and heat exchanger |
-
2009
- 2009-04-10 CN CN200910129972A patent/CN101858604A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121707A (en) * | 2011-04-22 | 2011-07-13 | 茂名重力石化机械制造有限公司 | Air preheater for cast iron on high-head fins |
| CN102155745A (en) * | 2011-04-22 | 2011-08-17 | 茂名重力石化机械制造有限公司 | Cast iron air preheater |
| CN102155745B (en) * | 2011-04-22 | 2012-07-25 | 茂名重力石化机械制造有限公司 | Cast iron air preheater |
| CN102121707B (en) * | 2011-04-22 | 2013-04-17 | 茂名重力石化机械制造有限公司 | Air preheater for cast iron on high-head fins |
| CN102297441A (en) * | 2011-06-03 | 2011-12-28 | 河北二十冶工程技术有限公司 | Cooling sealing device of cooling dead zone of evaporative cooling flue |
| CN102291857A (en) * | 2011-07-26 | 2011-12-21 | 冯忠和 | Universal electrode heater |
| CN106090989A (en) * | 2016-08-09 | 2016-11-09 | 瑞切尔石化设备（上海）有限公司 | A kind of elastic pressuring clamping device for plate air preheater |
| CN109185913A (en) * | 2018-09-18 | 2019-01-11 | 北京质为科技有限公司 | A kind of air preheater preventing clogging up device |
| CN109612311A (en) * | 2019-01-17 | 2019-04-12 | 广东环葆嘉节能科技有限公司 | A kind of heat-exchanging component and heat exchanger |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101858604A (en) | Anti-failure structure for cast iron air preheater and key process thereof | |
| CN201443778U (en) | Highly-effective air preheater resisting flue gas erosion | |
| CN102021260A (en) | Blast furnace profile monitoring system | |
| CN104404430A (en) | Iron-based non-crystalline composite coating for protecting heat exchange pipes in flue gas waste heat recovery system of power station boiler and laser re-melting and moulding technology thereof | |
| CN103878181B (en) | A kind of roll pass optimization method improving shaped roll service life | |
| CN206291195U (en) | A kind of furnace roof flexible stereo press mold sealing structure | |
| CN103486868B (en) | Efficient de-dirt Waste Heat Recovery energy saver | |
| CN101873733A (en) | Conductive copper jaw plate for mine heat furnace and manufacture method thereof | |
| CN108007223A (en) | Crawler type calcium carbide waste-heat recovery device and recovery method | |
| CN208688258U (en) | A kind of novel sinter trolley | |
| CN102759298A (en) | Arrangement mode of heat exchanger tube bundles | |
| CN201071380Y (en) | Vertical segmenting thermal treatment industry furnace | |
| CN101718436A (en) | Sorting type slag cooler for waste incinerator | |
| CN104595512A (en) | Water-cooled double-valve-plate high-temperature gate valve | |
| CN103882169B (en) | A kind of method improving blast furnace hearth cooling efficiency | |
| CN103162307A (en) | Novel process design method of tube heating furnace waste heat recovery system | |
| CN103214248B (en) | Blast furnace on-line extruding repairing material with high intensity, and good volume and thermal shock stability | |
| CN204007098U (en) | A kind of rail kiln of heat recovery pretreatment VN alloy blank | |
| CN107984723A (en) | Bimetal cylinder processing technology | |
| CN208776758U (en) | A kind of band convex copper cooling wall | |
| CN201581092U (en) | Combined cooling wall | |
| CN102397988A (en) | Composite metal mould | |
| CN111560559A (en) | Shock absorber blank based on austempered ductile iron and production process thereof | |
| CN103386457A (en) | Process for performing non-oxidation technical transformation on common medium-frequency forging furnace | |
| CN213172415U (en) | Honeycomb type blast furnace slag heat absorption assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20101013 |