CN203549797U - High-temperature corrosion prevention coking device for membrane wall type boiler - Google Patents
High-temperature corrosion prevention coking device for membrane wall type boiler Download PDFInfo
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- CN203549797U CN203549797U CN201320523433.6U CN201320523433U CN203549797U CN 203549797 U CN203549797 U CN 203549797U CN 201320523433 U CN201320523433 U CN 201320523433U CN 203549797 U CN203549797 U CN 203549797U
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Abstract
The utility model relates to a high-temperature corrosion prevention coking device for a membrane wall type boiler. The high-temperature corrosion prevention coking device for the membrane wall type boiler comprises water wall tubes and a boiler water-wall side wall, wherein the water wall tubes are staggered, and the boiler water-wall side wall is formed by connecting fins among the tubes; installation through holes are uniformly distributed in an area corresponding to a main combustion area of a hearth of the boiler water-wall side wall, and the installation through holes are formed in the fins among the tubes in the area; funnel cap type nozzles are arranged on the installation through holes in a mode of one-to-one correspondence, the top of one end of each funnel cap type nozzle extending into the inner wall of the boiler water-wall side wall is in a sealing cap structure, and a plurality of injection openings are uniformly distributed in the end along a circumferential direction; a side wall bellows which can cover all the funnel cap type nozzles and provide a wind source for the funnel cap type nozzles is arranged on the outer wall of the boiler water-wall side wall, an air inlet of the side wall bellows is connected with a main boiler air duct through a connecting air duct, and a control damper is arranged on the connecting air duct. The high-temperature corrosion prevention coking device has the advantages of simple structure, economic process and significant effect, reduces the phenomenon that the large area of the water wall is corroded and coked by high temperature due to the factor that pulverized coal burns by attaching to the wall, effectively ensures the safety of the boiler water-wall side wall, and reduces the repair cost.
Description
Technical field
The utility model relates to boiler combustion technology field, refers to particularly a kind of memberane wall type boiler high temperature corrosion resistance coking device.
Background technology
In the running of coal-burning boiler, the high temperature corrosion of avoiding water-cooling wall is the prerequisite of boiler of power plant safety economy stable operation.In the boiler of opposed firing burning, because liquidating, a large amount of pulverized coal particles enter hearth combustion, easily near the both walls of burner hearth, there is the adherent burning of a large amount of coal dusts, near causing boiler both walls water-cooling wall wall, form serious reducing atmosphere, thereby cause the high temperature corrosion of boiler water wall large area and coking.Particularly along with the increasingly stringent of thermal power plant's environmental requirement, burning that the low nitrogen of coal dust is oxygen debt becomes the Main Means of boiler of power plant burning gradually, this phenomenon is on the rise especially, the generation of this kind of situation has brought great hidden danger to the safe and stable operation of boiler, also causes the significantly increase of annual maintenance cost simultaneously.
At present, for above-mentioned situation, the technical approach that reduces boiler both walls water wall high temperature corrosion mainly contains following three kinds:
One, arranges border wind.Mode is from Secondary Air, to extract the air quantity of 5% left and right as border wind, from the two bottom sides wall of burner hearth, upwards climbs gradually.But in the process that the border wind of this form climbs in bottom, dissipate gradually totally, the primary combustion zone that needs protection and very few when above that climbs to cannot be realized oxidisability protective atmosphere like this on water-cooling wall wall.
Its two, in boiler front-back wall combustion zone, arrange after-flame wind nozzle under a plurality of sides.This mode is the penetrability that reaches injection stream, and the total blast volume conventionally taking, more than 10%, has greatly affected burning air quantity, easily causes boiler flyash carbon content to raise, and boiler combustion efficiency declines.This kind of mode can not realize the even protection of water-cooling wall wall simultaneously, affected low nitrogen effect.
Its three, water-cooling wall perforate is leaked out.Directly perforate in water-cooling wall both walls, utilizes combustion chamber draft that the outer cold air of stove is directly sucked to burner hearth from water-cooling wall perforate.But which, through practical application for many years, finds that this leaking out is all that direct vertical water wall enters burner hearth, cannot form wind film at water-cooling wall wall at all.Meanwhile, the air quantity leaking out is also uncontrollable, causes boiler combustion efficiency to decline, and affects the economy of boiler operatiopn.
Over nearly 20 years, in the type of furnace of opposed firing, various prevent side water wall high temperature corrosion measure all none success.Particularly contain in recent years a large amount of eastern coals of the alkali-metal standard of sodium potassium and utilized in a large number, boiler combustion more easily causes serious water wall high temperature corrosion and the generation of coking.Therefore, need to be a kind of in the situation that not affecting boiler combustion efficiency, avoid the solution of high temperature corrosion and the coking of side water wall.
Summary of the invention
The purpose of this utility model is exactly to eradicate the defect that the adherent burning of existing coal-burning boiler coal dust in running causes, and a kind of memberane wall type boiler high temperature corrosion resistance coking device is provided.
For achieving the above object, the memberane wall type boiler high temperature corrosion resistance coking device that the utility model is designed, comprise the boiler water wall side wall by fin is formed by connecting between the water screen tube of interlaced arrangement and pipe, its special character is: on described boiler water wall side wall, in the region corresponding with the main combustion zone of burner hearth, be evenly distributed with installation through hole, described installation through hole is opened between the pipe in this region on fin; On described installation through hole, correspondence is provided with funnel-cap type nozzle one by one, the top, one end that described funnel-cap type nozzle extend into boiler water wall side wall inwall is closure construction, and this end is uniformly distributed circumferentially several jet directions jet parallel with boiler water wall side wall inwall; On described boiler water wall side wall outer wall, be provided with and cover all funnel-cap type nozzles and for it provides the side wall bellows of wind regime, the air inlet of described side wall bellows is connected with boiler main air channel by connecting air channel, and described connection is provided with damper on air channel.
Preferably, the jet of described funnel-cap type nozzle is axial bars crack structure, angle between its jet direction and spout cylindrical tangent line is 30～45 °, its axial length is 2/5～3/5 of funnel-cap type nozzle total length degree, its area of injection orifice account for funnel-cap type nozzle in respective shaft to 50～70% of length section outside cylinder area.Like this, can make sprayed air be close to boiler water wall side wall and flow, form stable eddy flow.
Preferably, the jet of described funnel-cap type nozzle has been uniformly distributed circumferentially 6～8.Like this, can make adherent wind be uniformly distributed from all directions, form reliable and stable protectiveness wind film.
Preferably, described installation through hole and funnel-cap type nozzle disposed thereon are matrix distribution state, distance between adjacent funnel-cap type nozzle is 200～600mm, the best is the distance 380～420mm between the adjacent funnel-cap type nozzle of horizontal direction, the distance 330～370mm between the adjacent funnel-cap type nozzle of vertical direction.Like this, can make adherent wind more be evenly distributed in water-cooling wall side wall surface.
Preferably, on described connection air channel, be provided with expansion joint.Like this, can compensate or revise the air inlet of side wall bellows and the offset deviation in boiler main air channel.
Preferably, on described side wall bellows, be provided with inspection manhole.Like this, can be so that maintenance personal enters the maintenance of side wall bellows.
The utility model has the advantage of: designed memberane wall type boiler high temperature corrosion resistance coking device is directly drawn sub-fraction Secondary Air as adherent wind wind regime from boiler main air channel, by funnel-cap type nozzle, along circumferential uniform jet, sprayed, near boiler water wall side wall, flow equably, thereby form protectiveness wind film on boiler water wall side wall surface, coal dust anoxycausis forms near boiler water wall side wall high temperature and reducing atmosphere have been avoided, high temperature corrosion and the coking hidden danger of boiler side water wall have been stopped, effectively extended the service life of boiler water wall side wall, maintenance and the cost of overhaul have been reduced.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of memberane wall type boiler high temperature corrosion resistance coking device.
Fig. 2 is the scheme of installation of Fig. 1 apoplexy hat type nozzle on boiler water wall side wall.
Fig. 3 is the local structure for amplifying schematic diagram in Fig. 2.
Fig. 4 is the A-A cross-sectional view of Fig. 3.
In figure, each several part label is as follows: boiler water wall side wall 1(wherein: water screen tube 1a, fin 1b between pipe, installs through hole 1c); Funnel-cap type nozzle 2(is wherein: closure construction 2a, jet 2b); Side wall bellows 3(is wherein: inspection manhole 3a); Connect air channel 4; Boiler main air channel 5; Damper 6; Expansion joint 7.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Memberane wall type boiler high temperature corrosion resistance coking device as shown in Fig. 1～4, comprise the boiler water wall side wall 1 by fin 1b is formed by connecting between the water screen tube 1a of interlaced arrangement and pipe, on boiler water wall side wall 1, in the region corresponding with the main combustion zone of burner hearth, be evenly distributed with through hole 1c is installed, through hole 1c is installed and is opened between the pipe in this region on fin 1b.On installation through hole 1c, correspondence is welded with funnel-cap type nozzle 2 one by one, and it adopts heat-resisting steel material, and oxidation resistance temperature is about 1200 ℃.In funnel-cap type nozzle 2 profiles, be cylindric, its top, one end that extend into boiler water wall side wall 1 inwall is closure construction 2a, and this end is uniformly distributed circumferentially 8 jet directions jet 2b parallel with boiler water wall side wall 1 inwall.Jet 2b is axial bars crack structure, angle between its jet direction and spout cylindrical tangent line is 30～45 °, its axial length is designed to 2/5～3/5 of funnel-cap type nozzle 2 total lengths, its area of injection orifice account for funnel-cap type nozzle 2 in respective shaft to 50～70% of length section outside cylinder area, in the present embodiment, jet 2b axial length is 3/5 of funnel-cap type nozzle 2 total lengths, and area of injection orifice accounts for 60% of outside cylinder area.On boiler water wall side wall 1 outer wall, be provided with and cover all funnel-cap type nozzles 2 and provide the side wall bellows 3 of wind regime for it, the air inlet of side wall bellows 3 is connected with boiler main air channel 5 by connecting air channel 4, and side wall bellows 3 bottoms are provided with the inspection manhole 3a of being convenient to regular maintenance and maintenance.Connect on air channel 4 and be provided with damper 6, can adjust intake according to the combustion case in boiler.In order to revise the air inlet of side wall bellows and the offset deviation in boiler main air channel, connect air channel 4 and be provided with expansion joint 7.
During optimal design, funnel-cap type nozzle 2 is matrix distribution state, distance between adjacent funnel-cap type nozzle 2 is 200～600mm, as preferred plan, distance between the adjacent funnel-cap type nozzle 2 of horizontal direction is 380～420mm, distance between the adjacent funnel-cap type nozzle 2 of vertical direction is 330～370mm, in the present embodiment, boiler water wall side wall 1 corresponding to main combustion zone with horizontal direction 400mm, vertical direction 350mm for being arranged at intervals with 924 funnel-cap type nozzles 2.
In the running of memberane wall type boiler, open the damper 6 connecting on air channel 4, from boiler main air channel 5, draw a part of Secondary Air and enter into side wall bellows 3, these Secondary Airs can be close to the parallel ejection of boiler water wall side wall 1 inwall by each funnel-cap type nozzle 2.Control on the one hand wind speed in side wall bellows 3 between 0.5～2.0m/s, preferably below 1.0m/s; Control on the other hand the jet in funnel-cap type nozzle 2 exits between 5～20m/s, preferably, between 6～10m/s, in the present embodiment, recording funnel-cap type nozzle 2 exit effluxvelocities is 9.86m/s.Meanwhile, the adherent wind total amount of controlling 2 ejections of funnel-cap type nozzle accounts for and enters 0.5～4% of boiler furnace total blast volume, preferably below 1%.Can form to the adherent wind diaphragm of surrounding Uniform Flow diffusion at boiler water wall side wall 1 inwall, thereby guarantee that near boiler water wall side wall 1 inner wall surface main combustion zone, in oxidizing atmosphere, avoids high-temperature corrosion in boiler and coking.
The utility model is carried out to on-the-spot boiler renovation test, operation result shows: in 660MW unit pulverized coal firing boiler, adopt this kind of device, solve well the past in the water-cooling wall wall generation high temperature corrosion in run duration boiler both walls region and the problem such as be subject to that breeze airflow washes away, effectively ensured the safety of boiler water wall side wall.
Claims (7)
1. a memberane wall type boiler high temperature corrosion resistance coking device, comprise the boiler water wall side wall (1) by fin (1b) is formed by connecting between the water screen tube (1a) of interlaced arrangement and pipe, it is characterized in that: in the upper region corresponding with the main combustion zone of burner hearth of described boiler water wall side wall (1), be evenly distributed with through hole (1c) is installed, described installation through hole (1c) is opened on fin between the pipe in this region (1b); On described installation through hole (1c), correspondence is provided with funnel-cap type nozzle (2) one by one, the top, one end that described funnel-cap type nozzle (2) extend into boiler water wall side wall (1) inwall is closure construction (2a), and this end is uniformly distributed circumferentially several jet directions jet (2b) parallel with boiler water wall side wall (1) inwall; On described boiler water wall side wall (1) outer wall, be provided with and cover all funnel-cap type nozzles (2) and provide the side wall bellows (3) of wind regime for it, the air inlet of described side wall bellows (3) is connected with boiler main air channel (5) by connecting air channel (4), is provided with damper (6) on described connection air channel (4).
2. memberane wall type boiler high temperature corrosion resistance coking device according to claim 1, it is characterized in that: the jet (2b) of described funnel-cap type nozzle (2) is axial bars crack structure, angle between its jet direction and spout cylindrical tangent line is 30～45 °, its axial length is 2/5～3/5 of funnel-cap type nozzle (2) total length, its area of injection orifice account for funnel-cap type nozzle (2) in respective shaft to 50～70% of length section outside cylinder area.
3. memberane wall type boiler high temperature corrosion resistance coking device according to claim 1 and 2, is characterized in that: the jet (2b) of described funnel-cap type nozzle (2) has been uniformly distributed circumferentially 6～8.
4. memberane wall type boiler high temperature corrosion resistance coking device according to claim 1 and 2, it is characterized in that: described installation through hole (1c) and funnel-cap type nozzle (2) disposed thereon are matrix distribution state, and the distance between adjacent funnel-cap type nozzle (2) is 200～600mm.
5. memberane wall type boiler high temperature corrosion resistance coking device according to claim 1 and 2, it is characterized in that: described installation through hole (1c) and funnel-cap type nozzle (2) disposed thereon are matrix distribution state, distance between the adjacent funnel-cap type nozzle of horizontal direction (2) is 380～420mm, and the distance between the adjacent funnel-cap type nozzle of vertical direction (2) is 330～370mm.
6. memberane wall type boiler high temperature corrosion resistance coking device according to claim 1 and 2, is characterized in that: on described connection air channel (4), be provided with expansion joint (7).
7. memberane wall type boiler high temperature corrosion resistance coking device according to claim 1 and 2, is characterized in that: on described side wall bellows (3), be provided with inspection manhole (3a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320523433.6U CN203549797U (en) | 2013-08-26 | 2013-08-26 | High-temperature corrosion prevention coking device for membrane wall type boiler |
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| CN201320523433.6U CN203549797U (en) | 2013-08-26 | 2013-08-26 | High-temperature corrosion prevention coking device for membrane wall type boiler |
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| CN203549797U true CN203549797U (en) | 2014-04-16 |
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| CN201320523433.6U Expired - Lifetime CN203549797U (en) | 2013-08-26 | 2013-08-26 | 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 |
|---|---|---|---|---|
| CN107514650A (en) * | 2017-09-06 | 2017-12-26 | 西安热工研究院有限公司 | Prevent and treat the built-up welding regional selection method of water wall high temperature corrosion |
| CN110454808A (en) * | 2019-07-31 | 2019-11-15 | 华电电力科学研究院有限公司 | It is a kind of using steam high temperature corrosion resistance and the system of coking |
-
2013
- 2013-08-26 CN CN201320523433.6U patent/CN203549797U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107514650A (en) * | 2017-09-06 | 2017-12-26 | 西安热工研究院有限公司 | Prevent and treat the built-up welding regional selection method of water wall high temperature corrosion |
| CN107514650B (en) * | 2017-09-06 | 2019-02-05 | 西安热工研究院有限公司 | The built-up welding regional selection method for preventing and treating water wall high temperature corrosion |
| CN110454808A (en) * | 2019-07-31 | 2019-11-15 | 华电电力科学研究院有限公司 | It is a kind of using steam high temperature corrosion resistance and the system of coking |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20140416 |