CN204438101U - A kind of boiler opposed firing structure - Google Patents
A kind of boiler opposed firing structure Download PDFInfo
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- CN204438101U CN204438101U CN201520042916.3U CN201520042916U CN204438101U CN 204438101 U CN204438101 U CN 204438101U CN 201520042916 U CN201520042916 U CN 201520042916U CN 204438101 U CN204438101 U CN 204438101U
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- boiler
- wall
- burner
- side wall
- firing
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Abstract
A kind of boiler opposed firing structure, comprises the burner hearth become by circummure after wall, boiler right-side wall, boiler front wall and boiler on the left of boiler; On the left of boiler wall center line on to be furnished with left side wall burner along furnace height direction, the center line of boiler right-side wall is furnished with right-side wall burner along furnace height direction, boiler front wall is furnished with some row front wall firing devices, after boiler, wall is furnished with some row rear wall firing devices; On the left of boiler, after wall, boiler right-side wall, boiler front wall and boiler, wall outer is arranged with as burner hearth provides the bellows of Secondary Air and burnout degree.This structure is not affecting on original coal dust firing mode basis, thoroughly solves side water wall High Temperature Corrosion.
Description
Technical field
The utility model belongs to field of boilers, is specifically related to a kind of boiler opposed firing structure.
Background technology
Along with high parameter, Large Copacity fired power generating unit are implemented on a large scale, thermoelectricity technology has welcome new opportunity to develop, has also occurred new technical barrier simultaneously.In order to meet environment protection emission requirement, alleviate afterbody denitrating system operating pressure, new operation unit have employed low-NO_x combustion technology mostly to control the generation of nitrogen oxide.Low nitrogen burning mode is that main burner overlying regions is provided with fire air nozzle, and a part of Secondary Air sends into burner hearth from fire air nozzle, and main burner region is anoxycausis, and ignition temperature reduces, thus inhibits NO_x formation.
For Large Copacity Opposite Firing Boiler, because the reasons such as arrangement of burner cause the skewness of oxygen amount in burner hearth, near the O at both walls place
2content is most less than 1%, and the anoxic in main burner region runs the reducing atmosphere more exacerbating both walls, and especially both walls zone line oxygen content is minimum.In coal, S element will generate the H of certain content due to anoxic in combustion process
2s, H
2s can directly and boiler water wall react and generate FeS, when being stained with grieshoch temperature and being higher, FeS can again with the oxygen effect in medium, generate Fe
3o
4, oxygen corrosion is carried out further.In above process, water screen tube outer wall is corroded loss, pipe wall thickness reduction, serious threat unit safety operation.According to statistics, in 600MW, 1000MW Opposite Firing Boiler of having gone into operation, mostly there is both walls water wall high temperature corrosion problem, wherein serious with the water wall high temperature corrosion in (burnout degree is to lower floor's burner absolute altitude) scope in the middle part of both walls.
In order to avoid the wall thickness reduction that water wall high temperature corrosion causes, ensure safe operation of the boiler, Large Copacity Opposite Firing Boiler both walls takes anti-corrosion spray measure mostly, both walls water-cooling wall sprays corrosion resistant metal coating, aggressive atmosphere and tubing matrix Fe are isolated, slows down high temperature corrosion with this.But the safeguard procedures of this passive type can not solve High Temperature Corrosion in essence ground, peeling off of corrosion-inhibiting coating increases water-cooling wall operation risk on the contrary, increases boiler maintenance workload.The generation of High Temperature Corrosion main high with coal-fired sulfur content in coal, both walls reducing atmosphere is relevant.Because coal-fired ature of coal is uncontrollable factor, solve both walls water wall high temperature corrosion problem, main is to improve reducing atmosphere near both walls, improves both walls region oxygen content.
Utility model content
The purpose of this utility model is to provide a kind of boiler opposed firing structure, and this structure is not affecting on original coal dust firing mode basis, thoroughly solves side water wall High Temperature Corrosion.
In order to achieve the above object, the technical solution adopted in the utility model is: comprise the burner hearth become by circummure after wall, boiler right-side wall, boiler front wall and boiler on the left of boiler; On the left of boiler wall center line on to be furnished with left side wall burner along furnace height direction, the center line of boiler right-side wall is furnished with right-side wall burner along furnace height direction, and on the left of boiler, after wall, boiler right-side wall, boiler front wall and boiler, wall outer is arranged with as burner hearth provides the bellows of Secondary Air and burnout degree.
Described left side wall burner, right-side wall burner, front side wall burner and rear wall firing device all adopt turbulent burner.
Described boiler front wall is furnished with some row front wall firing devices, after boiler, wall is furnished with some row rear wall firing devices.
The First air spout of described front wall firing device, the First air spout of rear wall firing device are all connected with pulverized coal channel.
Described left side wall burner and right-side wall burner adopt single-row or dually arrayed; The First air spout of left side wall burner and the First air spout of right-side wall burner are all connected with pulverized coal channel.
Described pulverized coal channel is provided with coal powder distribation adjusting device.
The described pulverized coal channel of left side wall burner and the pulverized coal channel of right-side wall burner are also provided with electric check valve.
Described coal powder distribation adjusting device is adjustable contraction.
Described boiler front wall is furnished with the front wall after-flame air port that can be connected with bellows, after boiler, wall is furnished with the rear wall after-flame air port that can be connected with bellows; The inner second air spout of front wall firing device is all connected with bellows with outer second air spout with the inner second air spout of outer second air spout and right-side wall burner with the inner second air spout of the inner second air spout of outer second air spout, rear wall firing device with outer second air spout, left side wall burner.
High order end and the low order end of described boiler front wall do not arrange front wall firing device; After boiler, the high order end of wall and low order end do not arrange rear wall firing device.
Compared with prior art, the beneficial effects of the utility model are:
The center line of the utility model wall and right-side wall on the left of boiler arranges burner along furnace height direction, four sides wall is formed and non-ly cuts wall flame, coal dust firing is not had an impact, also make flame control in boiler furnace central area during burning simultaneously, on the left of boiler, wall and right-side wall near zone oxygen content improve, H
2s content reduces, and stops side water wall high temperature corrosion and occurs, improve unit operation reliability.The utility model is also the Secondary Air of burner hearth introducing heat by bellows, improves side wall region oxygen content, protection side water wall security of operation.
In addition, after wall, boiler right-side wall, boiler front wall and boiler, burner arranged by wall on the left of boiler, the thermal power of single burner can be reduced like this, improve the security of operation of burner, burner scaling loss is prevented to be out of shape, reduce wall thermic load, prevent water wall high temperature corrosion and coking, fundamentally solve side water wall High Temperature Corrosion.
Further, although the utility model, after boiler front wall and boiler, wall is provided with burner, but all do not arrange burner at their high order end and low order end, which increases the distance of burner respectively and on the left of boiler between wall and boiler right-side wall wall on wall after boiler front wall and boiler, after preventing boiler front wall and boiler, on wall, burner coal dust washes away the water-cooling wall of wall and boiler right-side wall on the left of boiler, reduces the combustion intensity of both walls region coal dust.
Accompanying drawing explanation
Fig. 1 is the schematic side view of the utility model boiler opposed firing structure;
Fig. 2 is the schematic top plan view of the utility model boiler opposed firing structure;
Fig. 3 is the connection diagram of the utility model side wall burner and pulverized coal channel;
Wherein, 1 is burner hearth, and 2 is front wall firing device, 3 is rear wall firing device, and 4 is left side wall burner, and 5 is right-side wall burner, 6 is bellows, 7 is boiler front wall, and 8 is wall after boiler, and 9 is wall on the left of boiler, 10 is boiler right-side wall, 11 is water-cooling wall, and 12 is front wall after-flame air port, and 13 is rear wall after-flame air port; 14 is pulverized coal channel, and 15 is electric check valve, and 16 is adjustable contraction.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further details.
See Fig. 1-2, the utility model, on opposed firing combustion system basis, proposes a kind of boiler opposed firing frame mode, and object is not affecting on original coal dust firing mode basis, improve both walls water-cooling wall region flue gas oxygen content, thoroughly solve side water wall High Temperature Corrosion.Comprise the burner hearth 1 surrounded by wall 8 after wall on the left of boiler 9 stove right-side wall 10, boiler front wall 7 and boiler; Because wall on the left of boiler 9 and boiler right-side wall 10 easily high temperature corrosion occur, therefore, on the left of boiler wall 9 center line on be furnished with left side wall burner 4 that is single-row or biserial along burner hearth 1 short transverse, the center line of boiler right-side wall 10 is furnished with right-side wall burner 5 that is single-row or biserial along burner hearth 1 short transverse; This makes it possible in burner hearth 1, form internal layer is generally flame, skin is the structure of air, avoid impact of flame on the wall, the burning situation of oxygen enrichment is comparatively speaking formed at burner hearth side water wall place, pre-high temperature corrosion resistance, solving existing Opposite Firing Boiler both walls region oxygen content on the low side, easily there is high temperature corrosion in water-cooling wall, the problem of water-cooling wall wall thickness reduction, proposes a kind of novel opposed firing mode.And, by arranging left side wall burner 4, right-side wall burner 5, front side wall burner 2 and rear wall firing device 3, reduce the thermal power of single burner, improve the security of operation of burner, prevent burner scaling loss to be out of shape, reduce wall thermic load, prevent water wall high temperature corrosion and coking.Boiler front wall 7 is furnished with some row front wall firing devices 2, after boiler, wall 8 is furnished with some row rear wall firing devices 3; Left side wall burner 4, right-side wall burner 5 absolute altitude and front wall firing device 2, rear wall firing device 3 absolute altitude are consistent, or are arranged in as required in different level.On the left of boiler, after wall 9, boiler right-side wall 10, boiler front wall 7 and boiler, wall 8 outer is arranged with as burner hearth 1 provides the bellows 6 of Secondary Air and burnout degree.In addition, boiler front wall 7 is furnished with the front wall after-flame air port 12 that can be connected with bellows 6, after boiler, wall 8 is furnished with the rear wall after-flame air port 13 that can be connected with bellows 6.
Left side wall burner 4, right-side wall burner 5, front side wall burner 2 and rear wall firing device 3 all adopt business to apply more ripe turbulent burner; The opening of the water-cooling wall 11 of left side wall burner 4, right-side wall burner 5, front wall firing device 2 and rear wall firing device 3 region matches with corresponding burner.
See Fig. 3, the First air spout of front wall firing device 2, the First air spout of rear wall firing device 3, the First air spout of left side wall burner 4 and the First air spout of right-side wall burner 5 are all connected with pulverized coal channel 14; Pulverized coal channel 14 is provided with coal powder distribation adjusting device (as adjustable contraction 16); On the left of boiler, wall burner 4 pulverized coal channel and boiler right-side wall burner 5 pulverized coal channel are also provided with electric check valve 15.Can as required, regulate burner combustion intensity, if desired, can close the electric check valve on the pulverized coal channel of wall pulverized coal channel on the left of boiler and boiler right-side wall, burner now serves as air port and uses.
When after the front side wall burner 2 and boiler of boiler front wall 7, the rear wall firing device 3 of wall 8 is traditional set-up mode, the pulverized coal channel (or during traditional set-up mode after boiler the pulverized coal channel of wall high order end rear wall firing device 3) of boiler front wall high order end front wall firing device 2 when the pulverized coal channel of the First air spout of left side wall burner 4 is traditional set-up mode; The pulverized coal channel (or during traditional set-up mode after boiler the pulverized coal channel of wall low order end rear wall firing device 3) of boiler front wall low order end front wall firing device 2 when the pulverized coal channel of the First air spout of right-side wall burner 5 is traditional set-up mode.That is, the First air spout wind powder of left side wall burner and right-side wall burner takes from wall most left/right side pulverized coal channel after the boiler front wall of traditional face-fired boiler, boiler;
The inner second air spout of front wall firing device 2 is all connected with bellows 6 with outer second air spout with the inner second air spout of outer second air spout and right-side wall burner 5 with the inner second air spout of the inner second air spout of outer second air spout, rear wall firing device 3 with outer second air spout, left side wall burner 4; bellows 6 are inner second air and the outer second air that burner hearth 1 introduces heat by inner second air spout and outer second air spout; improve the oxygen content in side wall region, water-cooling wall 11 security of operation on protection side wall.
The combustion system of the utility model boiler opposed firing structure is: start front side wall burner 2, rear wall firing device 3, left side wall burner 4, right-side wall burner 5, control combustion flame makes it in burner hearth 1 central area simultaneously, ensure that on the left of boiler, wall 9 and boiler right-side wall 10 place oxygen content are in safe range, prevent wall 9 on the left of boiler from the water-cooling wall 11 of right-side wall 10, high temperature corrosion occurring.When front wall firing device 2 and rear wall firing device 3 combustion heat power meet load, electric check valve 15 on left side wall burner and right-side wall burner pulverized coal channel 14 can be closed, under combustion chamber draft effect, outside air enters the First air spout of left side wall burner 4, right-side wall burner 5 through central tube, to cool First air spout, prevent First air spout scaling loss; In bellows 6, hot Secondary Air still enters burner hearth 1 by inside/outside overfire air port.
The beneficial effects of the utility model are: (1) arranges burner at boiler both walls zone line, four sides wall is formed and non-ly cuts wall flame, do not have an impact to coal dust firing.During burning, flame controls in boiler furnace central area, and both walls near zone oxygen content improves, H
2s content reduces, and stops side water wall high temperature corrosion and occurs, improve unit operation reliability; (2) increase the distance between the burner that front-back wall is arranged and side wall, prevent burner coal dust on forward and backward wall from washing away both walls water-cooling wall, reduce the combustion intensity of both walls region coal dust; (3) by arranging burner in both walls, reducing the thermal power of single burner, improving the security of operation of burner, preventing burner scaling loss to be out of shape.Reduce wall thermic load, prevent water wall high temperature corrosion and coking; (4) introduce hot Secondary Air at side wall place, improve side wall region oxygen content, protection side water wall security of operation.
Claims (10)
1. a boiler opposed firing structure, is characterized in that: comprise the burner hearth (1) surrounded by wall (8) after wall on the left of boiler (9), boiler right-side wall (10), boiler front wall (7) and boiler; On the left of boiler wall (9) center line on along burner hearth (1) short transverse be furnished with left side wall burner (4), the center line of boiler right-side wall (10) is furnished with right-side wall burner (5) along burner hearth (1) short transverse, and on the left of boiler, after wall (9), boiler right-side wall (10), boiler front wall (7) and boiler, wall (8) outer is arranged with as burner hearth (1) provides the bellows (6) of Secondary Air and burnout degree.
2. boiler opposed firing structure according to claim 1, is characterized in that: described left side wall burner (4), right-side wall burner (5), front side wall burner (2) and rear wall firing device (3) all adopt turbulent burner.
3. boiler opposed firing structure according to claim 1, it is characterized in that: described boiler front wall (7) is furnished with some row front wall firing devices (2), after boiler, wall (8) is furnished with some row rear wall firing devices (3).
4. boiler opposed firing structure according to claim 3, is characterized in that: the First air spout of described front wall firing device (2), the First air spout of rear wall firing device (3) are all connected with pulverized coal channel (14).
5. boiler opposed firing structure according to claim 1, is characterized in that: described left side wall burner (4) and right-side wall burner (5) adopt single-row or dually arrayed; The First air spout in left side wall burner (4) and the First air spout of right-side wall burner (5) are all connected with pulverized coal channel (14).
6. the boiler opposed firing structure according to claim 4 or 5, is characterized in that: described pulverized coal channel (14) is provided with coal powder distribation adjusting device.
7. boiler opposed firing structure according to claim 6, is characterized in that: the pulverized coal channel (14) in described left side wall burner (4) and the pulverized coal channel (14) of right-side wall burner (5) are also provided with electric check valve (15).
8. boiler opposed firing structure according to claim 6, is characterized in that: described coal powder distribation adjusting device is adjustable contraction (16).
9. boiler opposed firing structure according to claim 1, it is characterized in that: described boiler front wall (7) is furnished with the front wall after-flame air port (12) that can be connected with bellows (6), after boiler, wall (8) is furnished with the rear wall after-flame air port (13) that can be connected with bellows (6); The inner second air spout of front wall firing device (2) is all connected with bellows (6) with outer second air spout with the inner second air spout of outer second air spout and right-side wall burner (5) with the inner second air spout in outer second air spout, left side wall burner (4) with the inner second air spout of outer second air spout, rear wall firing device (3).
10. boiler opposed firing structure according to claim 1, is characterized in that: high order end and the low order end of described boiler front wall (7) do not arrange front wall firing device (2); After boiler, the high order end of wall (8) and low order end do not arrange rear wall firing device (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520042916.3U CN204438101U (en) | 2015-01-21 | 2015-01-21 | A kind of boiler opposed firing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520042916.3U CN204438101U (en) | 2015-01-21 | 2015-01-21 | A kind of boiler opposed firing structure |
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| Publication Number | Publication Date |
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| CN204438101U true CN204438101U (en) | 2015-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520042916.3U Expired - Fee Related CN204438101U (en) | 2015-01-21 | 2015-01-21 | A kind of boiler opposed firing structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595891A (en) * | 2015-01-21 | 2015-05-06 | 西安热工研究院有限公司 | Opposed firing structure of boiler |
| CN106678782A (en) * | 2015-11-06 | 2017-05-17 | 浙江浙能技术研究院有限公司 | Bowl-shaped or W-shaped wind distributing method for rotational flow combustion of large power station coal-fired boiler |
| CN110030550A (en) * | 2019-03-22 | 2019-07-19 | 华中科技大学 | A kind of opposed firing device system of supercritical carbon dioxide coal-burning boiler |
-
2015
- 2015-01-21 CN CN201520042916.3U patent/CN204438101U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595891A (en) * | 2015-01-21 | 2015-05-06 | 西安热工研究院有限公司 | Opposed firing structure of boiler |
| CN106678782A (en) * | 2015-11-06 | 2017-05-17 | 浙江浙能技术研究院有限公司 | Bowl-shaped or W-shaped wind distributing method for rotational flow combustion of large power station coal-fired boiler |
| CN110030550A (en) * | 2019-03-22 | 2019-07-19 | 华中科技大学 | A kind of opposed firing device system of supercritical carbon dioxide coal-burning boiler |
| CN110030550B (en) * | 2019-03-22 | 2020-04-03 | 华中科技大学 | Opposed burner system of supercritical carbon dioxide coal-fired boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20170121 |
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| CF01 | Termination of patent right due to non-payment of annual fee |