CN2906360Y - Powdered coal-burned W-type flame furnace with reduced NOx discharge - Google Patents
Powdered coal-burned W-type flame furnace with reduced NOx discharge Download PDFInfo
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- CN2906360Y CN2906360Y CN 200620020919 CN200620020919U CN2906360Y CN 2906360 Y CN2906360 Y CN 2906360Y CN 200620020919 CN200620020919 CN 200620020919 CN 200620020919 U CN200620020919 U CN 200620020919U CN 2906360 Y CN2906360 Y CN 2906360Y
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- furnace
- air duct
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- nox
- type flame
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Abstract
The utility model discloses a W-shaped flame furnace fuelled by NOx coal powder, relating to a burning device. For solving the problems of the prior W-shaped flame furnace produced by the inadequate burning of the coal powder and the inability to reduce the production of the NOx, the utility model provides a low NOx W-shaped flame furnace fuelled by the coal powder, comprising an upper furnace (1), a lower furnace (2) and a burner (5), wherein a second wind slit (2-1) is positioned on the sidewall of the lower furnace (2); the second wind slit (2-1) is communicated with a second air passage (3); an air door baffle plate (6) is positioned in the channel between the second air passage (3) and the perimeter air opening (5-1) of the burner (5); the second air passage (3) is communicated with the upper furnace (1) by a burnout air passage (4). Compared with the prior W-shaped flame furnace, the utility model has the advantages of reducing the exhaust of the NOx by more than 45% and increasing the burning efficiency by more than 1%, which is good for wide application.
Description
Technical field
The utility model relates to a kind of burner.
Background technology
W type flame burning technology is a kind of specially for using the combustion technology that low volatile coals such as anthracite design, and it can improve the after-flame that combustion zone temperature promotes coal dust by strengthening flame travel.This technology has satisfied the national conditions that China's boiler of power plant mainly uses coals inferior such as anthracite, meager coal, is adopted by the boiler of domestic part power plant at present, has a extensive future.Because W type flame furnace uses anthracite,, therefore just caused bigger nitrogen oxide (NOx) growing amount for guaranteeing that after-flame requires in the burner hearth higher temperature levels to be arranged.NOx is the primary pollution source that causes atmosphere pollution, State Environmental Protection Administration and State Administration for Quality Supervision and Inspection and Quarantine united in 2003 issued new revision national pollutant emission standard " thermal power plant's atmosphere pollutants emission standards " (GB13223-2003).Standard code: use the coal volatile matter and be lower than 10% unit, the NOx concentration of emission must not surpass 900mg/m
3If, do not take the low NOx drainage measure, be difficult to satisfy the emission request of NOx.NOx control mainly contains two kinds of approach, and the one, adopt the generation of low NO technology minimizing NOx, the 2nd, from flue gas, remove NOx.Under the present economic level of China, the former is comparatively effective, economically viable method; The latter's subject matter is to invest too highly, is not suitable for the national conditions of China.Therefore, how to adopt generation that the low NO technology reduces NOx in the W type flame furnace all be that crucial meaning is arranged to the development of China's power industry and whole national economy in research.Though existing W type flame furnace has been taked the generation of some technological means restriction nitrogen oxide, thereby still have a large amount of discharged nitrous oxides in atmosphere, to cause environmental pollution when using.In addition, also there is short, the inadequate problem of burning of fuel time of staying in burner hearth in present W type flame furnace.
The utility model content
Have the problem that coal dust firing is insufficient, can not well reduce the NOx generation at existing W type flame furnace, the utility model provides a kind of can better be reduced the NOx discharging and can make coal dust firing W type flame furnace more fully.
A kind of W type flame furnace of low-NOx coal powder, it comprises upper furnace 1, lower hearth 2, burner 5, on the sidewall of lower hearth 2, have secondary wind slit 2-1, described secondary wind slit 2-1 is communicated with secondary air duct 3, on the passage between the circumference air port 5-1 of secondary air duct 3 and burner 5 air door baffle plate 6 is installed, described secondary air duct 3 is communicated with upper furnace 1 by after-flame air channel 4 simultaneously.
The utility model adopts the low NO technology, greatly reduce the NOx discharge capacity, experiment showed, that structure described in the utility model has reduced more than 45% than present W type flame furnace NOx discharge capacity, and the efficiency of combustion that makes coal dust has improved more than 1%, is beneficial to and applies.
Description of drawings
Fig. 1 is the specific embodiment one a described structural representation, and Fig. 2 is the specific embodiment four described structural representations, and Fig. 3 is the specific embodiment five described structural representations.
The specific embodiment
The specific embodiment one: present embodiment is a kind of W type flame furnace of low-NOx coal powder, with reference to Fig. 1, it comprises upper furnace 1, lower hearth 2, burner 5, and what be positioned at the chimney arch top is upper furnace, what be positioned at the chimney arch below is lower hearth, and described burner 5 is fixed on the chimney arch.On the sidewall of lower hearth 2, have secondary wind slit 2-1, described secondary wind slit 2-1 is communicated with secondary air duct 3, on the passage between the circumference air port 5-1 of secondary air duct 3 and burner 5 air door baffle plate 6 is installed, described secondary air duct 3 is communicated with upper furnace 1 by after-flame air channel 4 simultaneously.Present embodiment is compared with existing W type flame furnace, has just structurally increased after-flame air channel 4, though simple in structure, but experimental results demonstrate, described simple structure can greatly reduce the NOx discharge capacity, and it is more abundant that coal dust firing is got, and principle is as follows:
Part secondary wind in the secondary air duct 3 sprays in the upper furnace 1 via after-flame wind snout 4-1, thereby the secondary air flow that enters in the lower hearth 2 via secondary wind slit 2-1 reduces, make lower hearth 2 be in the combustion with meagre oxygen state, present reducing atmosphere, suppressed the generation of fuel type NOx; And because lower hearth is in the oxygen deprivation state, temperature is low than the oxygen-enriched combusting state, though and upper furnace 1 is in the oxygen-enriched combusting state after increasing after-flame wind, but most of fuel this moment after-flame, temperature is not high yet, therefore whole burner hearth has suppressed the generation of temperature mode NOx installing the 4 back temperature reductions of after-flame air channel additional.So just can reduce the growing amount of NOx strengthening W type flame furnace under the prerequisite of advantage aspect the burning inferior coal.
Because there is the low problem of efficiency of combustion in present W type flame furnace in application process, discover through macromethod, encircle last wind vertically down penetrate encircleed in the process under secondary wind slit 2-1 inject the obstruct of the secondary wind of lower hearth 2, can't continue to go deep into burner hearth downwards, thereby it is up to turn back in advance, so pulverized coal particle appears in short partially phenomenon of the burner hearth high-temperature region time of staying, and unfavorable to after-flame.At inscribing around here, present embodiment is shunted secondary wind by after-flame air channel 4 is set, owing to increased primary air flow straight down on encircleing, reduced by secondary wind slit 2-1 and entered secondary air flow in the lower hearth 2, thereby the descending iris action of thick coal culm air-flow diminishes to encircleing upward to encircle following secondary wind, make the time of staying of pulverized coal particle in burner hearth elongated, thereby burning is more abundant.
The specific embodiment two: the described after-flame of present embodiment air channel 4 and the link position of secondary air duct 3 are arranged on the outside of air door baffle plate 6, and the aperture of damper baffle plate 6 can be controlled the temperature of burner nozzles.Present embodiment is arranged on the outside of air door baffle plate 6 with the after-flame air channel 4 and the link position of secondary air duct 3, can avoid after-flame wind to be subjected to the influence of air door baffle plate 6, thereby better realize described purpose.
The specific embodiment three: the described secondary wind of present embodiment slit 2-1 is communicated with secondary air duct 3 by secondary air duct 7 under the arch, in the junction of secondary air duct 3 with after-flame air channel 4, and the junction of secondary air duct 7 all is provided with secondary air register baffle plate 9 under secondary air duct 3 and arch, can control ratio between the uplink and downlink secondary wind by regulating these two secondary air register baffle plates 9, reduce NOx and promote the purpose of pulverized coal particle after-flame with better realization.
The specific embodiment four: as described in enforcement mode one, secondary wind slit 2-1 horizontal direction was injected the obstruct of the secondary wind of lower hearth 2 under the last wind of the arch of present W type flame furnace was penetrated under vertically and encircleed in the process, can't continue to go deep into burner hearth downwards, thereby it is up to turn back in advance, so coal dust occurs in short partially phenomenon of the burner hearth high-temperature region time of staying, at this problem, present embodiment is fixed with the deflector 8 of inclination in the secondary air duct 7 under arch, with reference to Fig. 2, deflector 8 is obliquely installed to secondary wind slit 2-1 direction, can deflector 8 be fixed on the sidewall of secondary air duct 7 under the arch by connecting rod 10.The guide functions of secondary wind process deflector 8 is by the downward-sloping lower hearth 2 of injecting of secondary wind slit 2-1 under the arch, make the thick coal culm air-flow be encircleed the position step-down of following secondary windage thus every effect, can make breeze airflow further be deep into burner hearth bottom, prolong the time of staying of pulverized coal particle in lower hearth 2, thereby promote the after-flame of pulverized coal particle better.
The specific embodiment five: secondary air duct 7 is tilted to down setting under the described arch of present embodiment, with reference to Fig. 3, under arch, be furnished with the deflector 8 under being tilted in the secondary air duct 7, the guide functions of secondary wind process deflector 8 is by the downward-sloping lower hearth 2 of injecting of secondary wind slit 2-1 under the arch, make the thick coal culm air-flow can further be deep into the lower hearth bottom thus, prolong pulverized coal particle in the time of staying of burner hearth high-temperature region, promote the after-flame of pulverized coal particle better.
Claims (5)
1. the W type flame furnace of a low-NOx coal powder, it comprises upper furnace (1), lower hearth (2), burner (5), on the sidewall of lower hearth (2), have secondary wind slit (2-1), described secondary wind slit (2-1) is communicated with secondary air duct (3), on the passage between the circumference air port (5-1) of secondary air duct (3) and burner (5) air door baffle plate (6) is installed, it is characterized in that described secondary air duct (3) is communicated with upper furnace (1) by after-flame air channel (4) simultaneously.
2. the W type flame furnace of a kind of low-NOx coal powder according to claim 1 is characterized in that the described after-flame air channel (4) and the link position of secondary air duct (3) are arranged on the outside of air door baffle plate (6).
3. the W type flame furnace of a kind of low-NOx coal powder according to claim 1 and 2, it is characterized in that described secondary wind slit (2-1) is communicated with secondary air duct (3) by secondary air duct (7) under the arch, in the junction of secondary air duct (3) with after-flame air channel (4), and the junction of secondary air duct (7) all is provided with secondary air register baffle plate (9) under secondary air duct (3) and arch.
4. the W type flame furnace of a kind of low-NOx coal powder according to claim 3, it is characterized in that being fixed with in the secondary air duct under the described arch (7) deflector (8) of inclination, described deflector (8) is fixed on the sidewall of secondary air duct (7) under the arch by connecting rod (10).
5. the W type flame furnace of a kind of low-NOx coal powder according to claim 4 is characterized in that secondary air duct under the described arch (7) is obliquely installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620020919 CN2906360Y (en) | 2006-05-26 | 2006-05-26 | Powdered coal-burned W-type flame furnace with reduced NOx discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620020919 CN2906360Y (en) | 2006-05-26 | 2006-05-26 | Powdered coal-burned W-type flame furnace with reduced NOx discharge |
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| Publication Number | Publication Date |
|---|---|
| CN2906360Y true CN2906360Y (en) | 2007-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620020919 Expired - Fee Related CN2906360Y (en) | 2006-05-26 | 2006-05-26 | Powdered coal-burned W-type flame furnace with reduced NOx discharge |
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| CN (1) | CN2906360Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864767A (en) * | 2021-10-21 | 2021-12-31 | 华能吉林发电有限公司长春热电厂 | System and method for enhancing wall type tangential boiler burnout air flow rigidity |
-
2006
- 2006-05-26 CN CN 200620020919 patent/CN2906360Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864767A (en) * | 2021-10-21 | 2021-12-31 | 华能吉林发电有限公司长春热电厂 | System and method for enhancing wall type tangential boiler burnout air flow rigidity |
| CN113864767B (en) * | 2021-10-21 | 2023-11-07 | 华能吉林发电有限公司长春热电厂 | System and method for enhancing over-fired air flow rigidity of wall-type tangential boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070530 Termination date: 20120526 |