CN105444199A - Tubular air preheater and heat exchange tube replacement method - Google Patents
Tubular air preheater and heat exchange tube replacement method Download PDFInfo
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- CN105444199A CN105444199A CN201510926169.4A CN201510926169A CN105444199A CN 105444199 A CN105444199 A CN 105444199A CN 201510926169 A CN201510926169 A CN 201510926169A CN 105444199 A CN105444199 A CN 105444199A
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- heat exchange
- exchange pipeline
- heat exchanger
- sealing plates
- exchanger tube
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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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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a tubular air preheater. The tubular air preheater comprises two sealing plates, and multiple heat exchange tubes connected between the two sealing plates; the heat exchange tubes include two heat exchange tube sections; and the heat exchange tube sections are connected to form the heat exchange tubes. The invention further provides a heat exchange tube replacement method; multiple heat exchange tubes required to be replaced and two original sealing plates corresponding to the heat exchange tubes required to be replaced are dismounted; the two replaced sealing plates are correspondingly fixed in the positions of the two original sealing plates; two ends of two heat exchange tube sections of the replaced heat exchange tubes are respectively connected with the two replaced sealing plates; and at least two heat exchange tube sections of the replaced heat exchange tubes are connected in sequence. Through the mode, local replacement of the heat exchange tubes is realized, the boiler heat efficiency is improved, the coal and electricity consumption is reduced, the resource utilization efficiency is improved, and the economic benefit is increased; and meanwhile, modules of the whole air preheater have no need to be replaced, so that the production cost is further reduced, and the resource waste is reduced.
Description
Technical field
The present invention relates to thermal power generating technology field, particularly relate to a kind of tubular air preheater and replacing heat-exchange tube method.
Background technology
Air preheater is that the flue gas in boiler back end ductwork will enter the heating device of the air preheat before boiler to uniform temperature by inner fin, for improving the heat exchange performance of boiler, reduces energy ezpenditure.In air preheater Long-Time Service process, by the impact of sulfur content and the several factors such as ash quantity, flying dust ratio in acid dew point and the coal of flue gas and water content, air themperature and humidity, excess air coefficient, coal, a lot of heat exchanger tube is caused to occur heavy wear.
Heat exchanger tube wearing and tearing directly cause the reduction of boiler thermal output, and generally, exhaust gas temperature often raises 10 DEG C, and heat loss due to exhaust gas increases by 0.6% ~ 1.0%, and gross coal consumption rate increases about 2g/kWh, causes the huge wasting of resources.In addition, because heat exchanger tube wearing and tearing are leaked out, air-introduced machine also may be caused to run power consumption and to increase.
For the steam generator system put into operation, usually adopt pipe stopper to carry out blocking to damaged heat exchanger tube to stop using deal with problems temporarily when heat exchanger tube breakage is slighter, if when part heat exchanger tube breakage more seriously needs to change, because air preheater volume is large, limit by space, being difficult to carry out local replacing installation to the heat exchanger tube of breakage, usually needing the whole air preheater of integral replacing, making the heat exchanger tube that much can continue to use also along with scrapping.
Summary of the invention
The object of the present invention is to provide a kind of tubular air preheater and replacing heat-exchange tube method, be intended to solve because of cannot the problem of the wasting of resources that causes of the boiler thermal output reduction that causes of the heat exchanger tube of local replacing air preheater breakage and integral replacing air preheater and cost.
For achieving the above object, a solution provided by the invention is: provide a kind of tubular air preheater, comprises two sealing plates and is connected to the some heat exchanger tubes between two sealing plates;
Heat exchanger tube at least comprises two heat exchange pipeline sections, and heat exchange pipeline section connects into heat exchanger tube.
Wherein, heat exchanger tube comprises sleeve pipe, two interconnective first heat exchange pipeline sections and the second heat exchange pipeline section, and the first heat exchange pipeline section is connected by sleeve pipe with the second heat exchange pipeline section.
Wherein, the first heat exchange pipeline section and the second heat exchange pipeline section adjacent both ends insert sleeve pipe, and respectively with sleeve pipe welded seal.
Wherein, two sealing plates are respectively equipped with the closed hole that several are mutually corresponding, heat exchanger tube two ends are passed the corresponding closed hole on two sealing plates and are welded together with corresponding sealing plate.
Wherein, the closed hole of the mutual correspondence on two sealing plates utilizes area of computer aided laser positioning process technology to process, and the hole heart of mutually corresponding closed hole is positioned on straight line.
Wherein, sealing plate comprises multiple sealing plate, and multiple sealing plate is spliced into sealing plate.
For achieving the above object, another kind of solution provided by the invention is: provide a kind of replacing heat-exchange tube method, comprising:
By the some heat exchanger tubes needing to change and the original two sealing plates dismountings needing some heat exchanger tubes of replacing corresponding;
By two sealing plates replaced corresponding position being fixed on original two sealing plates respectively;
The two ends of two heat exchange pipeline sections of the heat exchanger tube replaced are connected with two sealing plates replaced respectively;
At least two heat exchange pipeline sections of the heat exchanger tube of replacement are connected in turn.
Wherein, if two sealing plates replaced are respectively equipped with several mutually corresponding closed holes, the step that the two ends of two of the heat exchanger tube of replacement heat exchange pipeline sections are connected with two sealing plates replaced respectively is comprised:
The two ends of two heat exchange pipeline sections replaced are each passed through the corresponding closed hole on two sealing plates of replacement and weld together with the sealing plate of corresponding replacement.
Wherein, if the heat exchanger tube replaced comprises sleeve pipe, two interconnective first heat exchange pipeline sections and the second heat exchange pipeline section, the step that at least two heat exchange pipeline sections of the heat exchanger tube of replacement are connected in turn is comprised:
First heat exchange pipeline section is connected by sleeve pipe with the second heat exchange pipeline section.
Wherein, the step that at least two heat exchange pipeline sections of the heat exchanger tube of replacement are connected in turn is comprised further:
First heat exchange pipeline section and the second heat exchange pipeline section adjacent both ends are inserted sleeve pipe, and respectively with sleeve pipe welded seal.
Useful benefit: be different from prior art, the present invention is by being divided into some interconnective heat exchange pipeline sections by heat exchanger tube, the length of single heat exchange pipeline section is made to be less than the length of overall heat exchange pipe, condition is provided for convenience of changing, by original two sealing plates that the some heat exchanger tubes removing some heat exchanger tubes and the needs replacing needing to change are corresponding, by two sealing plates replaced corresponding position being fixed on original two sealing plates respectively, again the two ends of two heat exchange pipeline sections of the heat exchanger tube replaced are connected with two sealing plates replaced respectively, finally at least two heat exchange pipeline sections of the heat exchanger tube of replacement are connected in turn, thus complete the local replacing of damaged heat exchanger tube.The present invention changes damaged heat exchanger tube in time, improves boiler thermal output, reduces coal consumption power consumption, improves the level of resources utilization, increases economic well-being of workers and staff, simultaneously without the need to changing the whole module of air preheater, reduces production cost further, reduces the wasting of resources.
Accompanying drawing explanation
Fig. 1 is the structural representation of tubular air preheater embodiment one of the present invention;
Fig. 2 is the schematic diagram of tubular air preheater embodiment one heat exchanger tube of the present invention;
Fig. 3 is the closed hole schematic diagram of tubular air preheater embodiment one of the present invention;
Fig. 4 is tubular air preheater embodiment one sealing plate schematic diagram of the present invention;
Fig. 5 is the schematic flow sheet of replacing heat-exchange tube embodiment of the method one of the present invention;
Fig. 6 is the schematic diagram that replacing heat-exchange tube embodiment of the method one of the present invention needs the heat exchanger tube changed;
Fig. 7 is the schematic diagram of the heat exchanger tube that replacing heat-exchange tube embodiment of the method one of the present invention is replaced.
Detailed description of the invention
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, a kind of tubular air preheater provided by the present invention and replacing heat-exchange tube method are described in further detail.
As shown in Figure 1, tubular air preheater embodiment one of the present invention, comprising:
Two sealing plates 11/12 and the some heat exchanger tubes 13 be connected between two sealing plates 11/12, heat exchanger tube 13 at least comprises two heat exchange pipeline sections 101/102, and heat exchange pipeline section 101/102 connects into heat exchanger tube 13.
Particularly, tubular air preheater is arranged on the low-temperature zone position of steam generator system flue, utilizes the waste heat of smoke evacuation to preheat entering into inner combustion air, impels air to be issued to a good fired state in unburned situation, can boiler thermal output be improved, lower coal consumption power consumption.
During use, air is from the flowing of heat exchanger tube 13 inner horizontal, and flue gas, from the flowing of heat exchanger tube 13 external vertical, utilizes heat exchange tube wall to carry out heat exchange.Heat exchanger tube 13 adopts the heat-transfer pipe of pipe with small pipe diameter usually, common used material comprises carbon steel, low-alloy steel, stainless steel, copper, corronil, aluminium alloy, titanium etc., in addition some nonmetallic materials are also had, as graphite, pottery, polytetrafluoroethylene (PTFE) etc., during design, select suitable material according to operating pressure, temperature and corrosive medium etc.
Suppose that tubular air preheater is divided into three layers of vertical distribution, comprise 13000 heat exchanger tubes of having an appointment, every root heat exchanger tube is about 4m, these heat exchanger tube horizontal arrangement connect between two sealing plates, tubular air preheater adopts bottom-up mode to install usually, after installing, if want occurring that damaged heat exchanger tube is changed, the new heat exchanger tube after being removed by the heat exchanger tube of breakage, this being about 4m long is needed to reinstall, but limit by space, from outside or inside, new heat exchanger tube cannot be penetrated sealing plate to connect, therefore a long heat exchanger tube is divided at least two heat exchange pipeline sections by the embodiment of the present invention one, reduce length, be convenient to change and install.
Particularly, in order to reduce thermal loss, improve heat exchanger effectiveness, tubular air preheater has very high requirement to its sealing and heat exchanger tube 13 horizontality.Therefore heat exchanger tube 13 is divided into several heat exchange pipeline sections, usually be as the criterion so that actual needs can be met, the hop count divided is more few better, to be divided into two heat exchange pipeline sections 101/102, two heat exchange pipeline sections 101/102 connect into heat exchanger tube 13, make it in the same horizontal line during connection as far as possible, make air bottom horizontal flow sheet in heat exchanger tube 13, reduce the wearing and tearing of junction, junction adopts welding or other modes to make its sealing good.
Wherein, as shown in Figure 2, heat exchanger tube 13 comprises interconnective first heat exchange pipeline section 101 and the second heat exchange pipeline section 102 of sleeve pipe 103, two, first heat exchange pipeline section 101 is connected by sleeve pipe 103 with the second heat exchange pipeline section 102, optionally, first heat exchange pipeline section 101 and the second heat exchange pipeline section 102 adjacent both ends insert sleeve pipe 103, and respectively with sleeve pipe 103 welded seal.
If the first heat exchange pipeline section 101 and the second heat exchange pipeline section 102 are directly welded, the intensity, corrosion resistance etc. of the stress exchange heat pipe 13 of welding impact, therefore connected by sleeve pipe 103 between two heat exchange pipeline sections 101/102, the optional weld-end fittings 103 of sleeve pipe 103, the adjacent both ends of the first heat exchange pipeline section 101 and the second heat exchange pipeline section 102 is inserted sleeve pipe 103, carry out welded seal respectively in insert division, two ends 104/105, reduce stress, ensure welding quality.
Based on different Considerations, the connection of two heat exchange pipeline sections 101/102 also can adopt other modes, the such as optional threaded fitting of sleeve pipe 103, sleeve pipe 103 is provided with internal thread, first heat exchange pipeline section 101 and the second heat exchange pipeline section 102 are respectively equipped with external screw thread, by the two ends of the first heat exchange pipeline section 101 and the second heat exchange pipeline section 102 respectively with sleeve pipe 103 by inside and outside corresponding being threaded.
As shown in Figure 3, two sealing plates 11/12 are respectively equipped with the closed hole 14/15 that several are mutually corresponding, heat exchanger tube 13 two ends are passed the corresponding closed hole 14/15 on two sealing plates 11/12 and are welded together with corresponding sealing plate 11/12.
Tubular air preheater forms sealed environment by two sealing plates 11/12, flue gas is gathered in sealed environment, carries out heat exchange, reduce heat loss, sealing plate 11/12 arranges closed hole 14/15 makes heat exchanger tube 13 pass, flow in pipe to make combustion air, in order to make heat exchanger tube 13 maintenance level, closed hole 14/15 on two sealing plates 11/12 wants one_to_one corresponding, the hole heart of the closed hole 14/15 of mutual correspondence needs to be positioned on straight line 16, adding man-hour, adopt area of computer aided laser positioning process technology, the combination of computer and laser technology is utilized to carry out hi-Fix and punching.
As shown in Figure 4, be the front view of sealing plate 12, sealing plate 12 comprises multiple sealing plate 106, and multiple sealing plate 106 pieces is spliced into sealing plate 12.
Tubular air preheater adopts bottom-up mode to install usually, by space and installation performance constraint, sealing plate 12 is not an entire plate usually, but multiple sealing plate 106 is spliced, the optional identical or different shape of sealing plate 106, as rectangle or fan-shaped etc., for making its sealing good, between multiple sealing plate 106, usually adopt welding splicing.
When the embodiment of the present invention one is installed, utilize suspention or other modes that the two sealing plates being positioned at the mutual correspondence of bottom are put into relevant position, respectively that two heat exchange pipeline sections of a heat exchanger tube are corresponding to the closed hole on two sealing plates respectively again, install until all closed holes on this two sealings plate all penetrate heat exchange pipeline section successively, by sleeve pipe, welded seal is carried out successively to these heat exchange pipeline sections, then the part that heat exchange pipeline section is connected with closed hole is all welded, complete the installation of one group of sealing plate.Same mode completes the installation of other sealing plates, carries out welded seal by between these sealing plates.
Said process is just for the installation procedure sealing plate and heat exchanger tube, and practical operation order can be different, and the installation of whole tubular air preheater also comprises the installation of pipe-hanging hook, wind-box damper, sagging plate etc.
As shown in Figure 5, replacing heat-exchange tube embodiment of the method one of the present invention, this replacing options comprises:
Step S201: by the some heat exchanger tubes needing to change and the original two sealing plates dismountings needing some heat exchanger tubes of replacing corresponding;
In step s 201, tubular air preheater is overhauled, there is the damaged heat exchanger tube needing to change in mark, confirms the region of vast scale heat exchanger tube breakage, change the heat exchanger tube in this region, wherein, need the heat exchanger tube changed to can be one, several or several thousand up to a hundred etc., this is not limited, but consider the economic well-being of workers and staff that cost, resource distribution, energy consumption and operation etc. are overall, single or several heat exchanger tubes occur damaged time, usually do not change.
In order to reach better sealing effectiveness, supporting component such as the sealing plate exchanging heat pipe is also needed to change.Sealing plate is normally spliced by welding by multiple sealing plate, consider sealing and ease for operation, choosing and generally sealing plate with one or several when changing region is a replacing unit, that is, if occur, the region of vast scale heat exchanger tube breakage is not a complete sealing plate, then heat exchanger tube unbroken on sealing plate is also included in the region needing to change.
As shown in Figure 6, the heat exchanger tube being only the replacing of part needs shown in Fig. 6, optional more during practical operation, to the some heat exchanger tubes 23/24/25/26 needing to change, comprise heat exchanger tube 24/25/26 and the unbroken heat exchanger tube 23 of part of vast scale breakage, and original two sealing plates 21/22 of these heat exchanger tube 23/24/25/26 correspondences, remove, electric welding can be adopted to cut, two sealing plates 21/22, heat exchanger tube 23/24/25/26 are carried out respectively cutting and take out.
Step S202: by two sealing plates replaced corresponding position being fixed on original two sealing plates respectively;
After step S201 removes, slot milling can make machine and/or people carry out operation.Choose two sealing plates 27/28 of replacement, as shown in Figure 7, utilize sus-pension or other modes that two sealing plate 27/28 correspondences are fixed on the position of original two sealing plates 21/22, mention in above-mentioned, here two sealing plates 27/28 replaced change unit as one, are generally one or several sealing plate, after fixing position, general needs seal between plate with other and are connected, and connect and usually adopt welded seal.
Step S203: the two ends of two heat exchange pipeline sections of the some heat exchanger tubes replaced are connected with two sealing plates replaced respectively;
In step S203, as shown in Figure 7, choose some heat exchanger tubes 29 of replacement, each heat exchanger tube 29 at least comprises two heat exchange pipeline sections 291/292, and these two heat exchange pipeline sections 291/292 connect into heat exchanger tube 29.Two sealing plates 27/28 replaced are provided with the closed hole 30/31 of some mutual correspondences, be connected with two sealing plates 27/28 replaced respectively at the two ends of two heat exchange pipeline sections 291/292 replaced, the optional two ends by two heat exchange pipeline sections 291/292 replaced are each passed through the corresponding closed hole 30/31 on two sealing plates 27/28 of replacement.The some heat exchanger tubes 29 replaced are completed the connection with two sealing plates 27/28 in this way successively, and connect optional welded seal, welding herein also can be carried out after step S204.
Step S204: at least two heat exchange pipeline sections of the some heat exchanger tubes replaced are connected in turn.
In step S203, two heat exchange pipeline sections 291/292 of the heat exchanger tube 29 of all replacements have all completed with two sealing plates 27/28 and have been connected, and next exactly the assembling having connected heat exchanger tube 29 are carried out at the other two ends of these two heat exchange pipeline sections 291/292.In step S204, optional two heat exchange pipeline sections 291/292 to be connected by sleeve pipe 293, two heat exchange pipeline section 291/292 adjacent both ends are inserted sleeve pipe 293, and respectively with sleeve pipe 293 welded seal, try one's best during connection the level of maintenance two heat exchange pipeline sections 291/292, profit completes the connection of the heat exchanger tube 29 of all replacements in this way successively.
If the heat exchanger tube 29 replaced comprises the heat exchange pipeline section more than two, then choose after two heat exchange pipeline sections are connected with two sealing plates, the other end of one of them heat exchange pipeline section and remaining heat exchange pipeline section are connected to successively the other end of another heat exchange pipeline section, complete the connection of a heat exchanger tube, then complete the connection of the heat exchange pipeline section of all replacements.The optional sleeve pipe of connected mode adds the mode of welding, or adopts other modes.
In other embodiments, if space is sufficient, the order of each step of said method can be different, do not limit this.Said method is used for tubular air preheater of the present invention, but is not limited only to apparatus of the present invention, adapts to the situation of this method solving practical problems, at other devices also in the protection domain of replacing options of the present invention.
Replacing heat-exchange tube embodiment of the method two of the present invention, adopts the method for replacing heat-exchange tube embodiment of the method one of the present invention, carries out replacing heat-exchange tube, effectively improve boiler thermal output to the air preheater in steam generator system, reduces coal consumption power consumption, increases economic well-being of workers and staff.In long-term production uses, prior art cannot be carried out the situation of local replacing and utilize the method for replacing heat-exchange tube embodiment of the method one of the present invention, carrying out contrast experiment, draw some concrete numerical value, to describing the economic well-being of workers and staff increased in detail, there is certain reference value.These concrete numerals are only for referencial use, do not limit.
Wherein, reduce the economic well-being of workers and staff that power consumption increases: in prior art, because utilizing original tubular air preheater, damaged heat exchanger tube cannot be changed in time, primary air fan, overfire air fan, air-introduced machine power consumption is caused to be increased to 15.09%, and after adopting replacing options of the present invention to carry out the local replacing of damaged heat exchanger tube, primary air fan, overfire air fan, air-introduced machine power consumption are reduced to 12%.
Power consumption reduces by 3.09%, primary air fan increase economic well-being of workers and staff be 1100 (kW/ platform) * 0.7*2 (platforms) * 24 (h/ days) * 350 (my god) * 0.55 (unit/kWh) * 3.09%=21.9 ten thousand yuan/year, overfire air fan increase economic well-being of workers and staff be 650 (kW/ platform) * 0.7*2 (platforms) * 24 (h/ days) * 350 (my god) * 0.55 (unit/kWh) * 3.09%=12.9 ten thousand yuan/year, air-introduced machine increase economic well-being of workers and staff be 940 (kW/ platform) * 0.7*2 (platforms) * 24 (h/ days) * 350 (my god) * 0.55 (unit/kWh) * 3.09%=18.7 ten thousand yuan/year, the economic well-being of workers and staff reducing increase altogether because of power consumption is 21.9 ten thousand yuan/year+12.9 ten thousand yuan/year+18.7 ten thousand yuan/year=53.5 ten thousand yuan/year.
Damaged heat exchanger tube causes pipeline to leak out, and causes heat loss, increases coal consumption, and after carrying out local replacing, coal consumption reduces, and amounting to the mark coal economic well-being of workers and staff that calculating increases by the heat loss reduced is 35.6 ten thousand yuan/year.
The cost of investment caused because changing damaged heat exchanger tube is 0.51 ten thousand yuan/year.
The total economic well-being of workers and staff increased is 53.5 ten thousand yuan/year+35.6 ten thousand yuan/year-0.51 ten thousand yuan/year=88.5 ten thousand yuan/year.
This shows and utilize replacing heat-exchange tube method of the present invention effectively can improve boiler thermal output, reduce coal consumption power consumption, increase economic well-being of workers and staff.
The present invention describes a kind of tubular air preheater and replacing heat-exchange tube method in detail by above-mentioned three embodiments, tubular air preheater is by being divided into some interconnective heat exchange pipeline sections by heat exchanger tube, the length of single heat exchange pipeline section is made to be less than the length of overall heat exchange pipe, condition is provided for convenience of changing, and replacing heat-exchange tube method, original two sealing plates corresponding by the some heat exchanger tubes some heat exchanger tubes needing to change and needs changed are removed, by two sealing plates replaced corresponding position being fixed on original two sealing plates respectively, again the two ends of two heat exchange pipeline sections of the heat exchanger tube replaced are connected with two sealing plates replaced respectively, finally at least two heat exchange pipeline sections of the heat exchanger tube of replacement are connected in turn, thus complete the local replacing of damaged heat exchanger tube.The present invention realizes the local replacing of damaged heat exchanger tube, improves boiler thermal output, reduces coal consumption power consumption, improves the level of resources utilization, increases economic well-being of workers and staff, simultaneously without the need to changing the module of whole air preheater, reduces production cost further, reduces the wasting of resources.
The foregoing is only embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a tubular air preheater, is characterized in that:
Comprise two sealing plates and be connected to the some heat exchanger tubes between described two sealing plates;
Described heat exchanger tube at least comprises two heat exchange pipeline sections, and described heat exchange pipeline section connects into described heat exchanger tube.
2. tubular air preheater according to claim 1, is characterized in that,
Described heat exchanger tube comprises sleeve pipe, two interconnective first heat exchange pipeline sections and the second heat exchange pipeline section, and described first heat exchange pipeline section is connected by described sleeve pipe with described second heat exchange pipeline section.
3. tubular air preheater according to claim 2, is characterized in that,
Described first heat exchange pipeline section and described second heat exchange pipeline section adjacent both ends insert described sleeve pipe, and respectively with described sleeve pipe welded seal.
4. the tubular air preheater according to any one of claims 1 to 3, is characterized in that,
Described two sealing plates are respectively equipped with the closed hole that several are mutually corresponding, described heat exchanger tube two ends are passed the corresponding closed hole on described two sealing plates and are welded together with corresponding described sealing plate.
5. tubular air preheater according to claim 4, is characterized in that,
The closed hole of the described mutual correspondence on described two sealing plates utilizes area of computer aided laser positioning process technology to process, and the hole heart of the closed hole of described mutual correspondence is positioned on straight line.
6. tubular air preheater according to claim 5, is characterized in that,
Described sealing plate comprises multiple sealing plate, and described multiple sealing plate is spliced into described sealing plate.
7. a replacing heat-exchange tube method, is characterized in that, described method comprises:
Original two sealing plates that the some heat exchanger tubes some heat exchanger tubes needing to change and described needs changed are corresponding are removed;
By two sealing plates replaced corresponding position being fixed on described original two sealing plates respectively;
The two ends of two heat exchange pipeline sections of the heat exchanger tube replaced are connected with two sealing plates of described replacement respectively;
At least two heat exchange pipeline sections of the heat exchanger tube of described replacement are connected in turn.
8. method according to claim 7, is characterized in that, two sealing plates of described replacement is respectively equipped with the closed hole that several are mutually corresponding;
Described the step that the two ends of two of the heat exchanger tube of replacement heat exchange pipeline sections are connected with two sealing plates of described replacement respectively to be comprised:
The two ends of described two heat exchange pipeline sections replaced are each passed through the corresponding closed hole on two sealing plates of described replacement and weld together with the described sealing plate of corresponding replacement.
9. method according to claim 7, is characterized in that, the heat exchanger tube of described replacement comprises sleeve pipe, two interconnective first heat exchange pipeline sections and the second heat exchange pipeline section;
Described the step that at least two heat exchange pipeline sections of the heat exchanger tube of described replacement are connected in turn to be comprised:
Described first heat exchange pipeline section is connected by described sleeve pipe with described second heat exchange pipeline section.
10. method according to claim 9, is characterized in that,
Described the step that at least two heat exchange pipeline sections of the heat exchanger tube of described replacement are connected in turn to be comprised:
The adjacent both ends of described first heat exchange pipeline section and described second heat exchange pipeline section is inserted described sleeve pipe, and respectively with described sleeve pipe welded seal.
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| CN201510926169.4A CN105444199A (en) | 2015-12-14 | 2015-12-14 | Tubular air preheater and heat exchange tube replacement method |
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| CN201510926169.4A CN105444199A (en) | 2015-12-14 | 2015-12-14 | Tubular air preheater and heat exchange tube replacement method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106940134A (en) * | 2017-04-06 | 2017-07-11 | 安徽金尚机械制造有限公司 | Replaceable tubular exchanger |
| CN109945226A (en) * | 2019-03-12 | 2019-06-28 | 广东电网有限责任公司 | A kind of coal-burning power plant's air preheater Optimizing Reconstruction method and device |
| CN110198612A (en) * | 2018-10-09 | 2019-09-03 | 陈济颖 | A kind of separate type heat pipe radiator for heat power station |
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| CN204404858U (en) * | 2014-12-11 | 2015-06-17 | 山东大学 | A kind of detachable heat exchange sleeve |
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Application publication date: 20160330 |