CN103925612A - Method improving smoke corrosion resistance of pipeline on heating surface of coal-fired boiler - Google Patents
Method improving smoke corrosion resistance of pipeline on heating surface of coal-fired boiler Download PDFInfo
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- CN103925612A CN103925612A CN201410155119.6A CN201410155119A CN103925612A CN 103925612 A CN103925612 A CN 103925612A CN 201410155119 A CN201410155119 A CN 201410155119A CN 103925612 A CN103925612 A CN 103925612A
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- heating surface
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- fired boiler
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Abstract
The invention discloses a method improving the smoke corrosion resistance of a pipeline on a heating surface of a coal-fired boiler. A corrosion-resistant alloy strip (not larger than 500 micrometers) winds around and adheres to the pipeline so that the purposes of not influencing the heat transfer efficiency of the heating surface and remarkably improving the high temperature corrosion resistance and erosive wear resistance of the smoke side of the pipeline can be achieved. The method can be used for heating surface components such as a boiler water-cooling wall, a superheater, a reheater and a coal economizer. Compared with the method such as thermal spraying and anti-abrasion tile and sleeve applying adopted currently, the method has the advantages that operation is simpler, the heat conduction efficiency is higher, the cost is lower and the service life is longer.
Description
Technical field
The present invention relates to a kind of method of anti-flue gas corrosion, be specifically related to a kind of method that improves the anti-flue gas corrosion performance of heating surface of coal-fired boiler pipeline.
Background technology
Water-cooling wall, superheater, reheater, economizer pipe and the hanging part thereof of boiler directly contact with boiler combustion flue gas, etching problem is very serious, cause thus occurring to leak and demolition accident, be one of key factor threatening boiler of power plant safe operation, thereby must give sufficient attention.Meanwhile, the corrosion resistance of fume side is also one of middle index of boiler tubing selection.
The gas-side corrosion of boiler heating surface is a comparatively complicated physical and chemical process.This type of corrosion extensively exists on heating surface piping, and kind is various.Comprise: 1) high temperature corrosion.Generally include sulfide type high temperature corrosion and the large class of sulfate type high temperature corrosion two; 2) mechanical deposit.Due to the effect of the coarse and various gravitation on water-cooling wall surface, particulate flying dust is piled up and formed loose grey pollution layer; 3) cemented sediment.Due to the distillation of alkali metal oxide in ash in high-temperature flue gas, meet and coldly condense in soot particle in water-cooling wall or grieshoch and mutually produce chemical action, form low-melting compound and form adherent deposit; 4) agglutinating property dust stratification.Because chemical reaction occurs for the sulfur trioxide in the alkali metal oxide and the flue gas that condense in after high temperature biochemistry on water-cooling wall, aluminium oxide, iron oxide etc., form various sulfate; Or the sodium discharging when coal combustion and potassium react the sodium sulphate and the potassium sulfate that generate steam state with the sulfur trioxide in flue gas, spread and condense on the tube wall that temperature is lower; 5) molten slag layer.Stain grieshoch surface temperature higher, and coarse, the slagging scorification very easily in the above of fusing soot particle.Bonding grieshoch is cooling owing to can not get, and surface is molten state, and the soot particle that more easily constantly bonds, makes ash bed thickening, and temperature is higher, and direct surface is fused into liquid slag and flows away, till reaching balance.
Several contamination more than in boiler operatiopn and slagging scorification process intersection are carried out, but might not exist by several types simultaneously, main relevant with coal, furnace atmosphere and combustion conditions.For example: the SO that actual tube surfaces heterogeneous reaction produces
3concentration changes; In actual ash deposition thing, thermograde is very large; In addition, the ash cutting of heating surface of coal-fired boiler, not only will cause the frequent replacing of heating surface.Cost of electricity-generating is increased, but also will cause leakage or the pipe explosion accident of heating surface, endanger very large.The ash cutting of heating surface is general all with local character, in high flue gas corridor district and the large region of ashes concentration of cigarette speed, conventionally wearing and tearing are more serious, from the circumference of the pipe that is worn, the degree of wear is also the inhomogeneous etching problem for heating surface, and the method for solution normally changes fuel design or adopts corrosion-resistant coating with corrosion mitigation.According to the operating experience of station boiler, the corrosion-resistant coating generally adopting is thermal spraying anti-corrosion (wear-resisting) material, lid wearing-resistant tile (plate), the measures such as anti-corrosion sleeve pipe, high-temperature coatings.
Patent " a kind of hot spray wire for ultra supercritical boiler " (200910082746.0) has been invented a kind of hot spray wire for ultra supercritical boiler, has invented a kind of high-strength wearable hot spray wire for ultra-supercritical boiler high temperature superheater and the protection of reheater position.Be taking mild-carbon steel strip or stainless steel band as a material crust, in silk core, be added with CrB
2with SiC mix powder; CrB
2with the content of SiC mix powder in silk core be: 22-50wt%.The coating abrasionproof Anti-erosion effect that this invention is made is fine, but coated body composition is stainless steel, and its anti-sulfidation corrosion Performance Ratio is poor, and spray-on coating easily peels off in process under arms simultaneously, and safeguarding in welding process, coating can affect welding quality.Patent " high-temperature sulfur corrosion resisting cored wire used for spraying " (201010537078.9) has been invented a kind of high-temperature sulfur corrosion resisting cored wire used for spraying, and drug core component quality percentage composition scope is: crome metal: 30～70%; Nickel: 6～15%; Ferro-boron: 10～20%; Ferrosilicon: 5～10%; Aluminium: 5～10%; Copper: 2～10%; Rare earth: 2～5%.This sprayed on material is applicable to the steel pipe that the thermal coefficient of expansion such as carbon steel, ferritic steel is less, and for austenitic steel, the steel pipe that the thermal coefficient of expansions such as high temperature alloy are larger is inapplicable, easily comes off.Patent " fire resistant wear prevention paint " (02112893.6) has been invented a kind of for the fire resistant wear prevention paint on the metal pipe-wall of heat power plant boiler heating surface.By by weight 30% to 40% first material with account for gross weight 60% to 70% second material composition.Wherein, first material is composite phosphate bonding agent, makes after cooling by dihydro aluminum phosphate, Ludox, the reaction of KP1 Hybrid Heating; Second material is mixed powder, is mixed and is made by white fused alumina fine powder, white fused alumina Ultramicro-powder, brown corundum fine powder, brown corundum Ultramicro-powder, andalusite, sillimanite, raw clay, borax, calgon.Coating, through normal temperature maintenance and hot setting, forms the wear-preventing paint that layer of surface is smooth, anti-wear performance is good.This technology can play protection generator tube and avoid washing away of high temperature and high speed smoke gas flow, cannot stop the high temperature oxidation and corrosion of pipeline, and boiler start/ stop process easily comes off.
Except coating technology, cover one of conventional anti-corrosion, abrasionproof means of wearing-resistant tile Ye Shi power plant.Wearing-resistant tile is generally by carbon steel, and manganese steel is made, and cost is relatively low.Patent " wearing-resistant tile of buried pipe of boiler " (200920088355.5) has been invented a kind of wearing-resistant tile of buried pipe of boiler, its basic structure is semicircular in shape, its one end is designed with groove, the other end is tongue and groove flush end, the flush end of tile can insert in the groove of front a slice, connect successively, can effectively prevent the erosive wear of pipe laying.Patent " boiler economizer antiwear device " (201220138687.1) has been invented a kind of shoe being made up of arc wearing-resistant tile, economizer comb, large wear strip, little wear strip, wear strip through walls, heat-resisting reinforcing bar, lacing wire, by the reasonable link of difformity wearing-resistant tile, reach the object that pipe surface covers completely.In any case but the design of wearing-resistant tile how, needs by a large amount of solder technology in the installation process of tile, this has not only increased the difficulty of maintenance work, directly on pipeline, spot welding also can damage life-span of pipeline simultaneously.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of method that improves the anti-flue gas corrosion performance of heating surface of coal-fired boiler pipeline is provided, the method can effectively improve the anti-flue gas corrosion performance of heating surface of coal-fired boiler pipeline, and then improves the life-span of heating surface of coal-fired boiler pipeline.
For achieving the above object, the method concrete operations of the anti-flue gas corrosion performance of raising heating surface of coal-fired boiler pipeline of the present invention are: remove coking and corrosion layer on the outer wall of heating surface of coal-fired boiler pipeline, then corrosion resistant alloy strip is wound around or is fitted by bonding agent on the outer wall of heating surface of coal-fired boiler pipeline, the composition of described corrosion resistant alloy strip is the aluminium of Ni, the 15-55% of 40-80%, 0～5% impurity, and the thickness of corrosion resistant alloy strip is more than or equal to 100 microns and be less than or equal to 500 microns.
Described bonding agent is alumina silicate or phosphate.
Remove coking and corrosion layer on the outer wall of heating surface of coal-fired boiler pipeline by mechanical mode.
The present invention has following beneficial effect:
The method of the anti-flue gas corrosion performance of raising heating surface of coal-fired boiler pipeline of the present invention is in to the process of heating surface of coal-fired boiler line treatment, be wound around on the surface of heating surface of coal-fired boiler pipeline or laminating corrosion resistant alloy strip by bonding agent, in corrosion resistant alloy strip, Al content is 15-55%, thin thickness, be easily wound around and paste, high containing Al amount, and then make corrosion resistant alloy strip there is high anti-oxidation level decay resistance, and then the service life of improving heating surface of coal-fired boiler pipeline in the heat transfer efficiency that does not affect heating surface.
Brief description of the drawings
Fig. 1 is the structural representation of corrosion resistant alloy strip winding process in embodiment mono-in the present invention, embodiment bis-and embodiment tetra-;
Fig. 2 is the structural representation of corrosion resistant alloy strip adhesion process in embodiment tri-in the present invention.Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Embodiment mono-
With reference to figure 1, in the time that heating surface of coal-fired boiler pipeline is superheater, the method concrete operations of the anti-flue gas corrosion performance of described raising heating surface of coal-fired boiler pipeline are: remove coking and corrosion layer on the outer wall of heating surface of coal-fired boiler pipeline, then on the outer wall of heating surface of coal-fired boiler pipeline, be wound around corrosion resistant alloy strip by spiral way by bonding agent, the composition of described corrosion resistant alloy strip is 80% Ni, 15% aluminium and 5% impurity, and the thickness of corrosion resistant alloy strip is 500 microns.
Described bonding agent is alumina silicate.
Remove coking and corrosion layer on the outer wall of heating surface of coal-fired boiler pipeline by mechanical mode.
Embodiment bis-
With reference to figure 1, in the time that heating surface of coal-fired boiler pipeline is reheater, the method concrete operations of the anti-flue gas corrosion performance of described raising heating surface of coal-fired boiler pipeline are: remove coking and corrosion layer on the outer wall of heating surface of coal-fired boiler pipeline, then on the outer wall of heating surface of coal-fired boiler pipeline, be wound around corrosion resistant alloy strip by bonding agent, the composition of described corrosion resistant alloy strip is 40% Ni, 55% aluminium, 5% impurity, and the thickness of corrosion resistant alloy strip is 500 microns.
Described bonding agent is phosphate.
Remove coking and corrosion layer on the outer wall of heating surface of coal-fired boiler pipeline by mechanical mode.
Embodiment tri-
With reference to figure 2, in the time that heating surface of coal-fired boiler pipeline is water-cooling wall, the method concrete operations of the anti-flue gas corrosion performance of described raising heating surface of coal-fired boiler pipeline are: remove coking and corrosion layer on the outer wall of heating surface of coal-fired boiler pipeline, then the corrosion resistant alloy strip of fitting vertically on the outer wall of heating surface of coal-fired boiler pipeline by bonding agent, the composition of described corrosion resistant alloy strip is 70% Ni, 28% aluminium and 2% impurity, and the thickness of corrosion resistant alloy strip is 250 microns.
Described bonding agent is alumina silicate.
Remove coking and corrosion layer on the outer wall of heating surface of coal-fired boiler pipeline by mechanical mode.
Embodiment tetra-
With reference to figure 1, in the time that heating surface of coal-fired boiler pipeline is economizer, the method concrete operations of the anti-flue gas corrosion performance of described raising heating surface of coal-fired boiler pipeline are: remove coking and corrosion layer on the outer wall of heating surface of coal-fired boiler pipeline, then by bonding agent spiral winding corrosion resistant alloy strip on the outer wall of heating surface of coal-fired boiler pipeline, the composition of described corrosion resistant alloy strip is 60% Ni and 40% aluminium, and the thickness of corrosion resistant alloy strip is 100 microns.
Described bonding agent is phosphate.
Remove coking and corrosion layer on the outer wall of heating surface of coal-fired boiler pipeline by mechanical mode.
Utilize the application of the method for the invention at certain 600 DEG C of Boiler of Ultra-supercritical Unit pipeline:
Claims (3)
1. one kind is improved the method for the anti-flue gas corrosion performance of heating surface of coal-fired boiler pipeline, it is characterized in that, concrete operations are: remove coking and corrosion layer on the outer wall of heating surface of coal-fired boiler pipeline, then corrosion resistant alloy strip is wound around or is fitted by bonding agent on the outer wall of heating surface of coal-fired boiler pipeline, the composition of described corrosion resistant alloy strip is the aluminium of Ni, the 15-55% of 40-80%, 0～5% impurity, and the thickness of corrosion resistant alloy strip is more than or equal to 100 microns and be less than or equal to 500 microns.
2. the method for the anti-flue gas corrosion performance of raising heating surface of coal-fired boiler pipeline according to claim 1, is characterized in that, described bonding agent is alumina silicate or phosphate.
3. the method for the anti-flue gas corrosion performance of raising heating surface of coal-fired boiler pipeline according to claim 1, is characterized in that, removes coking and corrosion layer on the outer wall of heating surface of coal-fired boiler pipeline by mechanical mode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410155119.6A CN103925612B (en) | 2014-04-17 | 2014-04-17 | A kind of method that improves the anti-flue gas corrosion performance of heating surface of coal-fired boiler pipeline |
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| CN201410155119.6A CN103925612B (en) | 2014-04-17 | 2014-04-17 | A kind of method that improves the anti-flue gas corrosion performance of heating surface of coal-fired boiler pipeline |
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| CN103925612A true CN103925612A (en) | 2014-07-16 |
| CN103925612B CN103925612B (en) | 2016-05-18 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030545A (en) * | 2019-03-27 | 2019-07-19 | 华电电力科学研究院有限公司 | Anticorrosion antiwear film water cold wall structure |
| CN113564327A (en) * | 2021-07-20 | 2021-10-29 | 浙江泰富无缝钢管有限公司 | Heat treatment process suitable for manufacturing thick-wall steel pipe for power station boiler |
| CN113953514A (en) * | 2021-10-19 | 2022-01-21 | 西安热工研究院有限公司 | High-plasticity corrosion-resistant metal thin strip for boiler heating surface and preparation method thereof |
| CN116772227A (en) * | 2021-12-07 | 2023-09-19 | 北京丰润铭科贸有限责任公司 | Dedicated anti-freezing pipeline of coal fired boiler cooling system |
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| FR2795748A1 (en) * | 1999-07-02 | 2001-01-05 | Electricite De France | IMPROVED SURFACE COATING COMPOSITION |
| CN1666082A (en) * | 2002-05-29 | 2005-09-07 | 安德烈斯·穆泽拉尔 | Heat exchanger |
| CN101538696A (en) * | 2009-04-28 | 2009-09-23 | 江西恒大高新技术股份有限公司 | Hot spray wire for ultra supercritical boiler |
| CN101799252A (en) * | 2010-03-24 | 2010-08-11 | 北京化工大学 | Strengthened heat exchange tube |
| CN102994809A (en) * | 2012-12-04 | 2013-03-27 | 西安热工研究院有限公司 | High-strength and corrosion-resistant nickel-iron-chromium-based high-temperature alloy and preparation method for same |
| CN203099216U (en) * | 2013-01-25 | 2013-07-31 | 合肥海银杆塔有限公司 | Composite pipe and flue and chimney comprising same |
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2014
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2795748A1 (en) * | 1999-07-02 | 2001-01-05 | Electricite De France | IMPROVED SURFACE COATING COMPOSITION |
| CN1666082A (en) * | 2002-05-29 | 2005-09-07 | 安德烈斯·穆泽拉尔 | Heat exchanger |
| CN101538696A (en) * | 2009-04-28 | 2009-09-23 | 江西恒大高新技术股份有限公司 | Hot spray wire for ultra supercritical boiler |
| CN101799252A (en) * | 2010-03-24 | 2010-08-11 | 北京化工大学 | Strengthened heat exchange tube |
| CN102994809A (en) * | 2012-12-04 | 2013-03-27 | 西安热工研究院有限公司 | High-strength and corrosion-resistant nickel-iron-chromium-based high-temperature alloy and preparation method for same |
| CN203099216U (en) * | 2013-01-25 | 2013-07-31 | 合肥海银杆塔有限公司 | Composite pipe and flue and chimney comprising same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030545A (en) * | 2019-03-27 | 2019-07-19 | 华电电力科学研究院有限公司 | Anticorrosion antiwear film water cold wall structure |
| CN110030545B (en) * | 2019-03-27 | 2023-11-28 | 华电电力科学研究院有限公司 | Corrosion-resistant and wear-resistant membrane type water-cooled wall structure |
| CN113564327A (en) * | 2021-07-20 | 2021-10-29 | 浙江泰富无缝钢管有限公司 | Heat treatment process suitable for manufacturing thick-wall steel pipe for power station boiler |
| CN113953514A (en) * | 2021-10-19 | 2022-01-21 | 西安热工研究院有限公司 | High-plasticity corrosion-resistant metal thin strip for boiler heating surface and preparation method thereof |
| CN116772227A (en) * | 2021-12-07 | 2023-09-19 | 北京丰润铭科贸有限责任公司 | Dedicated anti-freezing pipeline of coal fired boiler cooling system |
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| CN103925612B (en) | 2016-05-18 |
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