CN105091019A - Deep energy-saving air preheater - Google Patents
Deep energy-saving air preheater Download PDFInfo
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- CN105091019A CN105091019A CN201510434253.4A CN201510434253A CN105091019A CN 105091019 A CN105091019 A CN 105091019A CN 201510434253 A CN201510434253 A CN 201510434253A CN 105091019 A CN105091019 A CN 105091019A
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- Prior art keywords
- air preheater
- flue gas
- condensate liquid
- degree
- condensing
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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
Abstract
The invention discloses a deep energy-saving air preheater, and relates to a deep energy-saving air preheater for a chemical engineering field. The preheater comprises a non-condensation type air preheater (1) and a condensation type air preheater (2), wherein a condensate collecting device (3) is added below the condensation type air preheater (2); a baffle plate (31) and a flow stabilizing plate (32) are arranged on the inner side wall of the condensate collecting device (3); a low-temperature smoke outlet pipeline (9) and a condensate discharge port (10) are arranged on the outer side wall; the low-temperature smoke outlet pipeline (9) is positioned at the middle upper part; the condensate discharge port (10) is positioned at the middle lower part; the outer wall surface of a heat exchange pipe (11) of the condensation type air preheater (2) is coated with a hydrophobic layer; a cleaning nozzle (4) is added on the heat exchange pipe (11); and the heat exchange pipe (11) is cleaned termly. The air preheater is high in heat exchange efficiency and long in service life, and effectively uses the afterheat to realize deep energy conservation.
Description
Technical field
The present invention relates to a kind of air preheater, especially a kind of degree of depth energy-saving air preheater for chemical field.
Background technology
Present stage is unclean due to furnace fuel, the composition containing macro-corrosion, and heating furnace exhaust gas temperature is general higher, and generally at 140-180 DEG C, the thermal efficiency is usually about 90%.In heating furnace, the acid dew piont corrosion of flue gas is one of key factor stoping thermal efficiency of heating furnace to improve further.Along with the further raising that environmental protection and energy saving require, under present circumstances, the fuel oil of many enterprises and fuel gas start complete desulfurization or close to complete desulfurization, realize cleaning of combustion-system fuel.Also can not there is dew point corrosion when there is water vapor condensation in the air preheater in residual neat recovering system, but also have the carbonated water etc. that small part corrosivity is less substantially.Meanwhile, also have a large amount of physical sensible heat not utilize, the more important thing is in high-temperature flue gas, contain a large amount of steam due in the flue gas that fuel oil and fuel gas buring produce, its latent heat of vaporization is discharged with flue gas, causes very large energy dissipation.Therefore, the air preheater that Exploitation Depth is energy-conservation is very necessary.
In air preheater material antiseptic, domestic occur many as novel anticorrosion materials such as enamel pipe, ni base alloy coating pipe and polytetrafluoroethylplastic plastic coated pipes, industrially obtain successful application, but be applied on condensing air preheater and also there is more limitation, the needs that the degree of depth is energy-conservation can not be met.There are now relevant unit and producer to develop the heat exchanger tube of applicable condensing heat-exchange simultaneously, such as nanoporous heat exchange element, dropwise condensation intensity can be improved, but be not suitable for the waste heat recovery of flue gas of heating furnace, therefore there is dust in flue gas, easy blocking nano-pore, and easily fouling, make this heat exchange element not reach the effect of anticipation at all.
If condensate liquid can not soak wall, condensate liquid is attached on wall with droplet morphology.After drop rises to certain size, tumble along wall or drip, exposing the wall of dripless, for continuation condensation.During ratio of heat transfer coefficient film condensation during dropwise condensation large 5 ~ 10 times or more.But in physical device, on existing equipment heat exchange element, dropwise condensation is unstable, is usually still film condensation, is difficult to realize efficient condensing heat-exchange.
The thermal conductivity of condensate liquid is low, and therefore the key of enforcing condensation heat transfer is to reduce condensate film thickness.The multiple cannelure pipe and the bellows that reduce thickness of liquid film are now developed.These condenser pipes utilize the effect of surface tension of liquid, and condensed fluid is concentrated on bottom groove, and thickness of liquid film on other surfaces is thinning.In addition, steam, when restraining condensed exterior, reasonable Arrangement to restrain position, to reduce the condensate liquid on upper array of pipes surface to the impact of lower array of pipes condensation, and is avoided liquid film obviously to thicken.Another approach of enforcing condensation heat transfer maintains dropwise condensation, can be coated with hydrophobic coating for this reason, or in steam, spray into a small amount of oiliness additive, but be all difficult to obtain lasting dropwise condensation on wall, and this respect needs to be studied further.
Because the defect that above-mentioned existing air preheater exists, the present inventor is based on being engaged in the practical experience and professional knowledge that this type of product design manufacture enriches for many years, and coordinate the utilization of scientific principle, actively in addition research and innovation, to founding a kind of degree of depth energy-saving air preheater, fully can recycle fume afterheat, the degree of depth realizing preheater is energy-conservation; Prevent heat exchanger tube dew point corrosion, and realize condensate liquid dropwise condensation, improve the heat exchange efficiency in air preheater life cycle, make it have more practicality.Through constantly research, design, and through repetition test and after improving, finally create the present invention had practical value.
Summary of the invention
The object of the invention is to, condensing heat-exchange is not suitable for for heat exchanger tube in existing air preheater, heat exchanger waste heat can not effectively utilize, a kind of degree of depth energy-saving air preheater is provided, there is in the heat exchanger tube outer wall surface coating of condensing air preheater the hydrophobic layer of anti-corrosion anti-scale function, increase condensed fluid collection device below air preheater condensation segment simultaneously, the air preheater made by the heat exchanger tube with this hydrophobic layer, realize efficient dropwise condensation, heat exchange efficiency is high, long service life, and effectively utilize waste heat, achieve the degree of depth energy-conservation.
The object of the invention to solve the technical problems realizes by the following technical solutions.
According to a kind of degree of depth energy-saving air preheater that the present invention proposes, it comprises on-condensing air preheater (1), condensing air preheater (2), Cryogenic air inlet line (5), high temperature air outlet line (6), high-temperature flue gas inlet line (7), connecting line (8), low-temperature flue gas outlet line (9), heat exchanger tube (11) is had in preheater, wherein
Condensed fluid collection device (3) is increased in the below of condensing air preheater (2);
The madial wall of condensed fluid collection device (3) is provided with deflection plate (31) and stabilier (32), lateral wall is provided with low-temperature flue gas outlet line (9) and condensate liquid outlet (10), low-temperature flue gas outlet line (9) is positioned at middle and upper part, and condensate liquid outlet (10) is positioned at middle and lower part;
In heat exchanger tube (11) outer wall surface coating heat exchanger tube hydrophobic layer (12) of described condensing air preheater (2), this hydrophobic layer is fluorine-containing hydrophobic resin anti-corrosion anti-scale coating; Heat exchanger tube (11) top in condensing air preheater (2) is provided with cleaning shower nozzle (4).
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid a kind of degree of depth energy-saving air preheater, wherein, described deflection plate (31) upper end is positioned at more than low-temperature flue gas outlet line (9), lower end to be positioned at residing for condensate liquid outlet (10) above the horizon, upper end and sidewall are enclosed construction, lower ending opening.
Aforesaid a kind of degree of depth energy-saving air preheater, wherein, described deflection plate (31) hypomere opening part has one piece of sloping baffle.
Aforesaid a kind of degree of depth energy-saving air preheater, wherein, described stabilier (32) upper end is positioned at more than condensate liquid outlet (10), lower end is positioned at condensate liquid outlet (10) below, upper end and sidewall are enclosed construction, lower ending opening, lower ending opening place is communicated with condensed fluid collection device (3) bottom.
Aforesaid a kind of degree of depth energy-saving air preheater, wherein, described deflection plate (31) upper end is skewed, and stabilier (32) upper end is horizontal.
Aforesaid a kind of degree of depth energy-saving air preheater, wherein, described low-temperature flue gas outlet line (9) lays respectively at relative both sides with condensate liquid outlet (10).
By technique scheme, a kind of degree of depth of the present invention energy-saving air preheater can reach suitable technological progress and practicality, and the extensive value had in industry, compared with prior art have obvious advantage and beneficial effect, it at least has following advantages:
(1) heat exchanger tube hydrophobic layer of the present invention has hydrophobic property, can enforcing condensation heat transfer, and improve the condensation efficiency of air preheater, coating not easily local shedding occurs, and reliability is high;
(2) this hydrophobic layer has fine and close molecular structure, smooth surface, and surface energy is low, effectively inhibits heat exchanger tube surface scale, improves heat transfer efficiency, extend service life;
(3) invention increases condensing heat-exchanging pipe high-pressure wash shower nozzle, timing can clean heat exchanger tube efficiently, ensure the clean of heat exchanger tube, improve condensation effect;
(4) invention increases Novel condensation liquor collecting device, this device have employed rational baffle arrangement, low-temperature flue gas can be avoided to carry acid water smoke and enter flue, improves the security of system.
(5) condensing air preheater of the present invention is while Mist heat recovering, and reclaimed again the latent heat of vaporization of part containing sour water steam, effectively improve the thermal efficiency of heating furnace, its thermal efficiency generally can reach 95%, even higher.
In sum, a kind of degree of depth energy-saving air of the present invention preheater has significant progress technically, and has obvious good effect, is really a new and innovative, progressive, practical new design.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of description, and can become apparent to allow above and other object of the present invention, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is the structure diagram of a kind of degree of depth energy-saving air of the present invention preheater.
Fig. 2 is the structure diagram of condensing air preheater inner band hydrophobic layer heat exchanger tube of the present invention.
[main element symbol description]
1: on-condensing air preheater 2: condensing air preheater
3: condensed fluid collection device 4: cleaning shower nozzle
5: Cryogenic air inlet line 6: high temperature air outlet line
7: high-temperature flue gas inlet line 8: connecting line
9: low-temperature flue gas outlet line 10: condensate liquid outlet
11: heat exchanger tube 12: heat exchanger tube hydrophobic layer
31: deflection plate 32: stabilier
Detailed description of the invention
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to a kind of degree of depth energy-saving air preheater proposed according to the present invention, its detailed description of the invention, structure, feature and effect thereof, be described in detail as follows.
A kind of degree of depth energy-saving air of the present invention preheater, this air preheater is made up of on-condensing air preheater 1 and 2 two sections, condensing air preheater, on-condensing air preheater 1 is basically identical with existing structure, condensing air preheater 2 agent structure and existing structure basically identical.The present invention adds Novel condensation liquor collecting device 3 in existing condensing air preheater agent structure, this condensed fluid collection device 3 is directly arranged in below condensing air preheater 2, be connected with condensing air preheater 2, it is inner that condensate liquid directly can fall condensed fluid collection device 3 from condenser pipe.
Condensed fluid collection device 3 madial wall is provided with deflection plate 31 and stabilier 32, and lateral wall is provided with low-temperature flue gas outlet line 9 and condensate liquid outlet 10; Low-temperature flue gas outlet line 9 and condensate liquid outlet 10 lay respectively at middle and upper part and the middle and lower part of condensed fluid collection device 3 lateral wall, and are positioned at relative both sides.
Deflection plate 31 upper end is positioned at low-temperature flue gas outlet line more than 9, and lower end to be positioned at residing for condensate liquid outlet 10 above the horizon, and upper end and sidewall are closed structure, lower ending opening, and opening part also has one piece of sloping baffle.The Main Function of deflection plate 31 prevents from flue gas from carrying condensate liquid to enter flue, ensures that the condensation droplet in low-temperature flue gas enters in condensed fluid collection device 3 by baffling effect.Low-temperature flue gas outlet line 9 is positioned at the region that deflection plate 31 covers.
Stabilier 32 upper end is positioned at condensate liquid outlet more than 10, and lower end is positioned at condensate liquid outlet less than 10, and stabilier 32 upper end and sidewall are closed structure, lower ending opening, and lower ending opening place is communicated with bottom condensed fluid collection device 3.The effect of stabilier 32 fully to ensure that condensate liquid is settled out the solid ash content in flue gas at condensed fluid collection device 3.Condensate liquid is after precipitation current stabilization, and discharge from condensate liquid outlet 10, the liquid of discharge is clear liquid substantially.Condensate liquid outlet 10 is positioned at the region that stabilier 32 covers.
Due to be operated in low-temperature dew point corrosion environment under, the tube bank of condensing air preheater fume side can cover the resistant materials such as pottery, glass, plastics or corrosion resistant metal, present invention employs the fluorine-containing hydrophobic resin with hydrophobic performance or modified hydrophobic silica.
The high-temperature resin coating (heat exchanger tube hydrophobic layer 12) that one deck has hydrophobic antiscaling effect is applied in heat exchanger tube 11 outer wall surface of condensing air preheater 2.This coating is fluorine-containing hydrophobic resin, can reduce the surface free energy of heat exchange tube wall, increases the contact angle of condensed water, make the easier landing of drop, make water vapour condensation change dropwise condensation into by film condensation, thus reduce liquid film thermal resistance, enhance diabatic process, dropwise condensation is held time length.Fluorine-containing hydrophobic resin layer can build hydrophobic condensing surface on the surface at the steam condensing of heat exchanger tube 11, greatly can improve heat exchange efficiency by hydrophobic dropwise condensation.
In order to prevent condensing air preheater dust stratification, being provided with high-pressure atomization in condensing air preheater 2 of the present invention and rinsing facility-cleaning shower nozzle 4.Cleaning shower nozzle 4 is a kind of pressure nozzle of exploitation, the atomization of cleaning fluid can be realized by highly pressurised liquid and high-speed rotational structure, high-pressure atomization cleaning fluid can realize the cleaning of condenser pipe efficiently, cleaning shower nozzle 4 can be as required, timing is opened, and ensures that condensing air preheater 2 efficiently works.The condensate liquid produced in condensing air preheater 2, black dirt and flushing liquor enter in condensed fluid collection device 3, and condensed fluid collection device 3 sidewall is provided with condensate liquid outlet 10, automatic overflow after condensate liquid exceedes the height of condensate liquid outlet 10.
On-condensing air preheater 1 of the present invention and condensing air preheater 2 can be combined into one placement, also can be separated.Wherein on-condensing air preheater 1 can adopt the heat pipe preheater of turbolator air preheater, duplex air preheater or adjustable thermic load as the case may be.Condensing air preheater 2 can be septate heat transfer regenerative air heater, as tubular type or plate air preheater, can be also indirect type air preheater, as various structures forms such as heat pipe preheaters.The structure of these air preheaters and mode of operation, be techniques well known.
The operation principle of a kind of degree of depth energy-saving air of the present invention preheater is: high-temperature flue gas enters on-condensing air preheater 1 by high-temperature flue gas inlet line 7, after this discharges sensible heat, flue-gas temperature is reduced to about 160-180 DEG C, ensures that the flue gas in on-condensing air preheater 1 downstream is in more than flue gas dew point temperature.Warm flue gas in after release sensible heat, condensing air preheater 2 is entered by connecting line 8, continue release sensible heat, have part containing sour water steam condensing release latent heat, flue-gas temperature is reduced to about 100 DEG C further, even lower simultaneously, the condensate liquid produced enters condensed fluid collection device 3 under gravity, through the precipitation current stabilization of stabilier 32, automatically discharge after condensate liquid exceedes the height of condensate liquid outlet 10, enter follow-up treating apparatus.Condensed fluid collection device 3 is entered by condensing air preheater 2 through condensed low-temperature flue gas, again after the deflection plate 31 of condensed fluid collection device 3 inside, liquid mist in further condensation flue gas, discharges through low-temperature flue gas outlet line 9, enters chimney and enters air.Cryogenic air is introduced into condensing air preheater 2 by Cryogenic air inlet line 5 and absorbs heat, then enters on-condensing air preheater 1 and absorb heat further, and high temperature air enters heating furnace by high temperature air outlet line 6 subsequently.After air preheater work a period of time, can by the high-pressure atomization cleaning fluid of cleaning shower nozzle 4, cleaning heat exchanger tube 11, ensures the surface cleaning of heat exchanger tube hydrophobic layer 12.
A kind of degree of depth energy-saving air of the present invention preheater is while recovered flue gas low temperature sensible heat, and reclaimed again the latent heat of vaporization of part containing sour water steam, effectively improve the thermal efficiency of heating furnace, its thermal efficiency generally can reach 95%, even higher.
The technological innovation of a kind of degree of depth energy-saving air of the invention described above preheater, all has many saving graces for technical staff of the same trade now, and the progressive that really possesses skills.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (6)
1. a degree of depth energy-saving air preheater, comprise on-condensing air preheater (1), condensing air preheater (2), Cryogenic air inlet line (5), high temperature air outlet line (6), high-temperature flue gas inlet line (7), connecting line (8), low-temperature flue gas outlet line (9), there is heat exchanger tube (11) in preheater, it is characterized in that:
Condensed fluid collection device (3) is increased in the below of condensing air preheater (2);
The madial wall of condensed fluid collection device (3) is provided with deflection plate (31) and stabilier (32), lateral wall is provided with low-temperature flue gas outlet line (9) and condensate liquid outlet (10), low-temperature flue gas outlet line (9) is positioned at middle and upper part, and condensate liquid outlet (10) is positioned at middle and lower part;
In heat exchanger tube (11) outer wall surface coating heat exchanger tube hydrophobic layer (12) of described condensing air preheater (2), this hydrophobic layer is fluorine-containing hydrophobic resin anti-corrosion anti-scale coating; Heat exchanger tube (11) top in condensing air preheater (2) is provided with cleaning shower nozzle (4).
2. a kind of degree of depth energy-saving air preheater according to claim 1, it is characterized in that: described deflection plate (31) upper end is positioned at more than low-temperature flue gas outlet line (9), lower end to be positioned at residing for condensate liquid outlet (10) above the horizon, upper end and sidewall are enclosed construction, lower ending opening.
3. a kind of degree of depth energy-saving air preheater according to claim 1, is characterized in that: described deflection plate (31) hypomere opening part has one piece of sloping baffle.
4. a kind of degree of depth energy-saving air preheater according to claim 1, it is characterized in that: described stabilier (32) upper end is positioned at more than condensate liquid outlet (10), lower end is positioned at condensate liquid outlet (10) below, upper end and sidewall are enclosed construction, lower ending opening, lower ending opening place is communicated with condensed fluid collection device (3) bottom.
5. a kind of degree of depth energy-saving air preheater according to claim 1, is characterized in that: described deflection plate (31) upper end is skewed, and stabilier (32) upper end is horizontal.
6. a kind of degree of depth energy-saving air preheater according to claim 1, is characterized in that: described low-temperature flue gas outlet line (9) lays respectively at relative both sides with condensate liquid outlet (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510434253.4A CN105091019A (en) | 2015-07-22 | 2015-07-22 | Deep energy-saving air preheater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510434253.4A CN105091019A (en) | 2015-07-22 | 2015-07-22 | Deep energy-saving air preheater |
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| CN105091019A true CN105091019A (en) | 2015-11-25 |
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| CN201510434253.4A Pending CN105091019A (en) | 2015-07-22 | 2015-07-22 | Deep energy-saving air preheater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106765289A (en) * | 2017-02-24 | 2017-05-31 | 广州睿瞰能源技术有限公司 | A kind of boiler fresh air preheating device |
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| CN204830004U (en) * | 2015-07-22 | 2015-12-02 | 洛阳三信石化设备有限公司 | Energy -conserving air heater of degree of depth |
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2015
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1793766A (en) * | 2006-01-05 | 2006-06-28 | 中国石油化工集团公司 | Tube type heating furnace |
| CN201088967Y (en) * | 2007-07-31 | 2008-07-23 | 比亚迪股份有限公司 | Circulating rinse bath |
| CN102809168A (en) * | 2011-06-01 | 2012-12-05 | 中国石油化工股份有限公司 | Air preheater and application thereof |
| CN102980171A (en) * | 2011-09-06 | 2013-03-20 | 陈兴元 | Economizer capable of recycling waste heat of flue in depth and concealing, desulfurizing and aspirating flue of coal-fired boiler |
| CN103162304A (en) * | 2011-12-13 | 2013-06-19 | 河南电力勘测设计院 | Automatic deicing device of barrel head of chimney and deicing method thereof |
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| CN106765289A (en) * | 2017-02-24 | 2017-05-31 | 广州睿瞰能源技术有限公司 | A kind of boiler fresh air preheating device |
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Application publication date: 20151125 |