CN107514650A - Prevent and treat the built-up welding regional selection method of water wall high temperature corrosion - Google Patents
Prevent and treat the built-up welding regional selection method of water wall high temperature corrosion Download PDFInfo
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- CN107514650A CN107514650A CN201710797400.3A CN201710797400A CN107514650A CN 107514650 A CN107514650 A CN 107514650A CN 201710797400 A CN201710797400 A CN 201710797400A CN 107514650 A CN107514650 A CN 107514650A
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- water
- screen tube
- high temperature
- temperature corrosion
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M2900/00—Special features of, or arrangements for combustion chambers
- F23M2900/05001—Preventing corrosion by using special lining materials or other techniques
Abstract
A kind of built-up welding regional selection method for preventing and treating water wall high temperature corrosion, according to flue gas flow, it is divided into helical water-cooled wall pipe up and down, flue gas flow direction downstream is top water screen tube circle；Determine the intersection point A of top helical water-cooled wall pipe and water-cooling wall fin；By A points, make the tangent line AB of lower part helical water screen tube；Determine the intersection point C of lower part helical water screen tube and water-cooling wall fin；AC is on the inside of water-cooling wall fin stove；It is built-up welding region by straight line AC, tangent line AB and camber line BC the irregular figure ABC formed；By above-mentioned built-up welding, uncombusted bulky grain coal dust can be prevented to be deposited on water screen tube surface, avoid burning of the coal dust on water screen tube, avoided the high temperature corrosion in the region, equally avoid the high temperature corrosion of water screen tube lower surface；Therefore, the high temperature corrosion of water screen tube upper and lower surface can be effectively avoided by the inventive method；It is few in the volume of water-cooling wall upper table surface build-up welding in addition, low cost, it is easy to widely popularize in power plant, not only increases the security of unit, while has saved cost.
Description
Technical field
The present invention relates to pulverized-coal fired boiler water wall high temperature corrosion Prevention Technique field, and in particular to one kind preventing and treating water-cooling wall is high
The built-up welding regional selection method of temperature corrosion, and then the high temperature corrosion of water screen tube upper surface is avoided, prevented and treated suitable for pulverized-coal fired boiler
Water wall high temperature corrosion.
Background technology
The high temperature corrosion of heating surface of coal-fired boiler is a complicated physical and chemical process, drastically influence the peace of boiler
Entirely, stable operation.Before low NO transformation, the high temperature corrosion of China's boiler occurs mainly in that sulfur content is higher, burning row
On the longer Lean Coal-fired Boiler of journey.With the application of low NO and air deep-graded technology in recent years, high temperature corrosion is simultaneously
Appear on the pulverized-coal fired boiler for using middle high sulphur content Bituminous Coal.
According to the investigation of the practical operation situation of current boiler and high temperature corrosion situation, find low nitrogen burning mode to water cooling
Wall high-temperature corrosion influence is very big, and in the case where ature of coal is constant, the boiler for obvious high temperature corrosion do not occur before low nitrogen transformation exists
There is the situation that water wall high temperature corrosion substantially aggravates after low nitrogen transformation.The reason for causing boiler water-cooling wall high-temperature corrosion is main
It is too low excess air coefficient, causes Secondary Air to mend wind deficiency, stronger reducing atmosphere is formed in burner region；Coal
Powder fineness is partially thick, and the pulverized coal particle of not yet after-flame moves to water-cooling wall and adherent burning occurs, and causes to corrode further exacerbation；Work as coal
Middle sulfur content increase etc., result in the corrosion of water-cooling wall surface high-temp.
Pulverized-coal fired boiler receives certain effect using spraying resistant material and then the purpose of high temperature corrosion preventing and treating at present
Fruit.
The content of the invention
In order to fundamentally solve the problems, such as the upper and lower surface high-temp corrosion of water-cooling wall, the present invention provides a kind of preventing and treating water cooling
The built-up welding regional selection method of wall high-temperature corrosion.
In order to achieve the above object, the present invention adopts the following technical scheme that：
A kind of built-up welding regional selection method for preventing and treating water wall high temperature corrosion, it is characterised in that：Comprise the following steps：
Step 1：According to flue gas flow, it is divided into helical water-cooled wall pipe up and down, the downstream of flue gas flow direction is top water screen tube
Circle；Determine top helical water-cooled wall pipe 2 with being connected the intersection point A of the water-cooling wall fin of helical water-cooled wall pipe up and down；
Step 2：By A points, make the tangent line AB of lower part helical water screen tube 1；
Step 3：Determine the intersection point C of lower part helical water screen tube 1 and water-cooling wall fin；
Step 4：AC is connection lower part helical water screen tube 1 and top helical water-cooled wall pipe 2 on the inside of water-cooling wall fin stove；
Step 5：The irregular figure ABC being made up of straight line AC, tangent line AB and camber line BC is to prevent and treat water-cooling wall high temperature
The built-up welding region of corrosion.
Present invention selection built-up welding mode, different from the anticorrosion with painting mode of routine；By above-mentioned built-up welding, can prevent uncombusted
Bulky grain coal dust be deposited on water screen tube surface, avoid burning of the coal dust on water screen tube, avoid the high temperature in the region rotten
Erosion, meanwhile, fin and each bottom water screen tube surface would not also have stink damp caused by the coal dust firing of pipe upper surface
Body, equally avoid the high temperature corrosion of water screen tube lower surface.Therefore, by this method can effectively avoid water screen tube upper surface and
The high temperature corrosion of lower surface.It is few in the volume of water-cooling wall upper table surface build-up welding in addition, low cost, it is easy to widely popularize in power plant, no
The security of unit is improve only, while has saved cost.
Brief description of the drawings
Fig. 1 is Spiral Coil Waterwall stove internal corrosion schematic diagram.
Fig. 2 is the built-up welding administrative division map of preventing and treating water wall high temperature corrosion.
Embodiment
The present invention is described in more detail with reference to the accompanying drawings and detailed description.
Find that water wall high temperature corrosion causes water-cooling wall weakened region to be mainly that last wind snout arrives by on-the-spot test
Reducing zone between SOFA wind, wind snout is between last wind next time, and wind snout subtracts between furnace hopper bottom next time
Thin position is predominantly located at the upper and lower part of burner hearth inside spin water screen tube.
As shown in figure 1, the upper surface seriously corroded of lower part helical water screen tube 1 of contact inner flue gas of the stove, top spiral water-cooling
The lower surface serious corrosion of wall pipe 2 (region of blacking in Fig. 1), and lower part helical water screen tube 1 and top spiral water-cooling
The high order end tube surface of wall pipe 2 does not almost corrode.
The reason for analyzing water-wall corrosion is that the coal dust of larger particles falls the surface (radius in lower part helical water screen tube 1
The outer surface of the pipe 1 of O1A and O1O2 lines), influenceed coal dust by radiant heat in stove and burnt in tube surface, due to burner
Region is anoxycausis in itself, and the coal dust sulfur content on water-cooling wall is higher in addition, and again less with the contact surface of air, sulphur exists in coal
Burning produces the corrosion such as composite sulfur hydrochlorate, sulfide in the case of anoxic, causes the upper surface of lower part helical water screen tube 1 to be thinned
(outer tube surface of radius O1A and O1O2 line, the blacking part of lower part helical water screen tube 1 is coal dust, lime-ash and corrosion production
Thing etc.)；And caused hydrogen sulfide gas then flows up along fin, on the one hand corrode water-cooling wall fin, on the other hand in corrosion
The bottom (outer surface of the pipe 2 of radius O2B and O2O1 line) of portion's helical water-cooled wall pipe 2, sees Fig. 1.
To reach the corrosion for solving the upper and lower surface of water screen tube and fin, the present invention uses following technical scheme：
Rational built-up welding region is selected in pulverized-coal fired boiler water screen tube and fin high temperature corrosion, is specially：
1) according to flue gas flow, it is divided into helical water-cooled wall pipe up and down, the downstream of flue gas flow direction is top water screen tube circle；Really
Top helical water-cooled wall pipe 2 is determined with being connected the intersection point A of the water-cooling wall fin of helical water-cooled wall pipe up and down；
2) by A points, the tangent line AB of lower part helical water screen tube 1 is made；
3) the intersection point C of lower part helical water screen tube 1 and water-cooling wall fin is determined；
4) AC is connection lower part helical water screen tube 1 and top helical water-cooled wall pipe 2 on the inside of water-cooling wall fin stove；
5) the irregular figure ABC being made up of straight line AC, tangent line AB and camber line BC is this anticorrosion built-up welding region；
By above-mentioned built-up welding, uncombusted bulky grain coal dust can be prevented to be deposited on water screen tube surface, avoid coal dust in water
Burning on cold wall pipe, the high temperature corrosion in the region is avoided, meanwhile, fin and each bottom water screen tube surface would not also deposit
In hydrogen sulfide gas caused by the coal dust firing of pipe upper surface, the high temperature corrosion of water screen tube lower surface is equally avoided.Therefore, pass through
The inventive method can effectively avoid the high temperature corrosion of water screen tube upper and lower surface.In addition in water-cooling wall upper table surface build-up welding
Volume is few, low cost, is easy to widely popularize in power plant, not only increases the security of unit, while has saved cost.
Claims (1)
- A kind of 1. built-up welding regional selection method for preventing and treating water wall high temperature corrosion, it is characterised in that：Comprise the following steps：Step 1：According to flue gas flow, it is divided into helical water-cooled wall pipe up and down, the downstream of flue gas flow direction is top water screen tube circle；Really Top helical water-cooled wall pipe 2 is determined with being connected the intersection point A of the water-cooling wall fin of helical water-cooled wall pipe up and down；Step 2：By A points, make the tangent line AB of lower part helical water screen tube 1；Step 3：Determine the intersection point C of lower part helical water screen tube 1 and water-cooling wall fin；Step 4：AC is connection lower part helical water screen tube 1 and top helical water-cooled wall pipe 2 on the inside of water-cooling wall fin stove；Step 5：The irregular figure ABC being made up of straight line AC, tangent line AB and camber line BC is to prevent and treat water wall high temperature corrosion Built-up welding region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710797400.3A CN107514650B (en) | 2017-09-06 | 2017-09-06 | The built-up welding regional selection method for preventing and treating water wall high temperature corrosion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710797400.3A CN107514650B (en) | 2017-09-06 | 2017-09-06 | The built-up welding regional selection method for preventing and treating water wall high temperature corrosion |
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| CN107514650A true CN107514650A (en) | 2017-12-26 |
| CN107514650B CN107514650B (en) | 2019-02-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110936077A (en) * | 2019-12-31 | 2020-03-31 | 南京衍构科技有限公司 | Method for generating surfacing path of membrane type water-cooled wall |
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| JP2000249288A (en) * | 1999-03-02 | 2000-09-12 | Babcock Hitachi Kk | Heating tube corrosion preventing method for oil burning boiler |
| JP2002317903A (en) * | 2001-02-16 | 2002-10-31 | Nkk Corp | Boiler equipped with corrosion resistant heat transfer pipe for heat exchange |
| DE10303173A1 (en) * | 2003-01-27 | 2004-08-05 | Saint-Gobain Industriekeramik Düsseldorf Gmbh | Pipe wall protection for a boiler pipe wall |
| JP2006097928A (en) * | 2004-09-28 | 2006-04-13 | Babcock Hitachi Kk | Boiler |
| JP2007155233A (en) * | 2005-12-06 | 2007-06-21 | Babcock Hitachi Kk | Boiler furnace and manufacturing method of panel for boiler furnace |
| CN103438438A (en) * | 2013-08-26 | 2013-12-11 | 中节环立为（武汉）能源技术有限公司 | Method and device for preventing membrane water wall type boiler from high-temperature corrosion and coking |
| CN203549797U (en) * | 2013-08-26 | 2014-04-16 | 中节环立为（武汉）能源技术有限公司 | High-temperature corrosion prevention coking device for membrane wall type boiler |
| CN103912893A (en) * | 2014-04-15 | 2014-07-09 | 太原理工大学 | Boiler water-cooled wall protecting device capable of preventing coking and high temperature corrosion |
| CN206094013U (en) * | 2016-06-07 | 2017-04-12 | 中国大唐集团科学技术研究院有限公司 | Fin cast membrane wall |
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2017
- 2017-09-06 CN CN201710797400.3A patent/CN107514650B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1264809A (en) * | 1999-02-24 | 2000-08-30 | 阿尔斯通能源系统有限公司 | Burner |
| JP2000249288A (en) * | 1999-03-02 | 2000-09-12 | Babcock Hitachi Kk | Heating tube corrosion preventing method for oil burning boiler |
| JP2002317903A (en) * | 2001-02-16 | 2002-10-31 | Nkk Corp | Boiler equipped with corrosion resistant heat transfer pipe for heat exchange |
| DE10303173A1 (en) * | 2003-01-27 | 2004-08-05 | Saint-Gobain Industriekeramik Düsseldorf Gmbh | Pipe wall protection for a boiler pipe wall |
| JP2006097928A (en) * | 2004-09-28 | 2006-04-13 | Babcock Hitachi Kk | Boiler |
| JP2007155233A (en) * | 2005-12-06 | 2007-06-21 | Babcock Hitachi Kk | Boiler furnace and manufacturing method of panel for boiler furnace |
| CN103438438A (en) * | 2013-08-26 | 2013-12-11 | 中节环立为（武汉）能源技术有限公司 | Method and device for preventing membrane water wall type boiler from high-temperature corrosion and coking |
| CN203549797U (en) * | 2013-08-26 | 2014-04-16 | 中节环立为（武汉）能源技术有限公司 | High-temperature corrosion prevention coking device for membrane wall type boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110936077A (en) * | 2019-12-31 | 2020-03-31 | 南京衍构科技有限公司 | Method for generating surfacing path of membrane type water-cooled wall |
| CN110936077B (en) * | 2019-12-31 | 2021-11-26 | 南京衍构科技有限公司 | Method for generating surfacing path of membrane type water-cooled wall |
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| CN107514650B (en) | 2019-02-05 |
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