CN203718765U - Low-NOx burner with tertiary air - Google Patents
Low-NOx burner with tertiary air Download PDFInfo
- Publication number
- CN203718765U CN203718765U CN201420060470.2U CN201420060470U CN203718765U CN 203718765 U CN203718765 U CN 203718765U CN 201420060470 U CN201420060470 U CN 201420060470U CN 203718765 U CN203718765 U CN 203718765U
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- tertiary air
- air
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- coal
- tertiary
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Abstract
The utility model provides a low-NOx burner with tertiary air. The burner consists of a box casing, a pulverized coal nozzle, a primary air pipe, a tertiary air sleeve and a superfine powder separator, wherein the air flow of the tertiary air passes the superfine powder separator and is divided into a strong air flow and a weak air flow, the strong tertiary air is fed into the tertiary air sleeve, and is fed into a hearth between primary air and secondary air of the pulverized coal nozzle, the modes that weak pulverized coal (compacted tertiary air) is enclosed by hot-blast air (the secondary air), and thick pulverized coal (the primary air) is enclosed by the weak pulverized coal (the compacted tertiary air) are formed at the outlet of the pulverized coal nozzle from the outside to the inside, and a pulverized coal concentration gradient is formed due to the grading feeding of the pulverized coal. By adopting the low-NOx burner with the tertiary air provided by the utility model, the traditional mode of the feeding of the tertiary air into the hearth is changed, and the adverse influence on the stability of burning of a boiler, the control on the generation of NOx and the economy of the boiler caused by the fact that the tertiary air flow massively enters the hearth is avoided under the condition of not influencing the burning.
Description
Technical field
The utility model relates to a kind of band tertiary air low-NOx combustor, belongs to combustion apparatus field.
Background technology
The thermal power plant of China, warehouse formula pulverized coal carried by hot air combustion system in the middle of most pulverized-coal fired boilers extensively adopt, in pulverized coal preparation system, pulverized-coal collector top extracts the weary gas that carries particulate coal dust, directly sends into upper furnace tertiary air nozzle participate in burning by mill exhauster, is called tertiary air.Tertiary air is usually placed in the superiors of burner, under it, is furnished with primary and secondary air.Tertiary air is all sent on top, main burner region, can cause obvious adverse effect: 1. tertiary air temperature is low, furnace flame temperature is reduced, combustion instability; 2. tertiary air is close to furnace outlet, and temperature is low, and burning time is short, easily causes fly ash combustible material to increase; 3. flame is spun out, and furnace outlet gas temperature raises, and easily makes superheater and reheater overtemperature.4. a large amount of tertiary airs is sent into primary combustion zone, and coal dust is mixed at primary combustion zone with a large amount of air, and fractional combustion weak effect, is unfavorable for controlling the generation of NOx.Therefore, need a kind of novel mode that tertiary air is sent into burner hearth.
Summary of the invention
The utility model object is to provide a kind of band tertiary air low-NOx combustor, after tertiary air is concentrated with superfine powder separator, form dense tertiary air air-flow and send into burner hearth between wind of coal nozzle and Secondary Air, avoid tertiary air air-flow once to enter in a large number stability and the boiler economy of burner hearth to boiler combustion and have a negative impact.
In order to achieve the above object, the one band tertiary air low-NOx combustor that the technical solution of the utility model provides, is characterized in that: burner is made up of case shell, coal nozzle, airduct, tertiary air sleeve pipe and a superfine powder separator.Secondary Air enters by coal nozzle and sends into burner hearth from case shell, and case shell is played a supporting role to airduct, tertiary air sleeve pipe and a coal nozzle simultaneously; One time airduct becomes cylindrical or shaped as frame or square circular, and one end is connected with coal nozzle, and the other end is connected with pulverized coal channel; Tertiary air casing pipe sleeve, in the outside of an airduct, can be any side or any many sides, and the width of every side can be wide or not wide, and one end is connected with microfine coal separator through case shell, and the other end is connected with coal nozzle; Coal nozzle is made up of nozzle housing, nozzle center and nozzle inside casing, nozzle inside casing is connected with a wind pipeline, general mood stream enters coal nozzle inside casing by airduct once, inject burner hearth by coal nozzle inside casing, nozzle center is connected with tertiary air sleeve pipe, correspondence is arranged in any side or many sides of coal nozzle, the width of every side can be wide or not wide, nozzle housing is for sending Secondary Air air-flow into burner hearth, nozzle inside casing, nozzle center and nozzle housing are connected by gusset, and whole nozzle is fixed on airduct or case shell; Tertiary air air-flow is divided into deep or light two strands of air-flows after superfine powder separator, dense tertiary air air-flow enters tertiary air sleeve pipe, light tertiary air air-flow whereabouts is not within the scope of the utility model, can be incorporated to Secondary Air and enter burner hearth by overfire air jet, also can be used as separation after-flame wind and send into burner hearth, also can the coal dust of light tertiary air air-flow be separated by other devices, air-flow after treatment directly discharges etc.
The one band tertiary air low-NOx combustor that the utility model provides, change the disposable burner hearth mode of sending in a large number of traditional tertiary air, send into from coal nozzle concentrated the fine breeze of tertiary air, form hot blast (Secondary Air) bag thin powdered coal (concentrated tertiary air) at coal nozzle outlet ecto-entad, thin powdered coal (concentrated tertiary air) bag thick coal culm (wind) form, coal dust classification is sent into and is formed coal powder density gradient.The mode of sending into from coal nozzle after this tertiary air is concentrated has avoided tertiary air all to send on top, main burner region, because tertiary air temperature is low, furnace flame temperature is reduced, combustion instability; Tertiary air is close to furnace outlet, and temperature is low, and burning time is short, easily causes fly ash combustible material to increase; Flame is spun out, and furnace outlet gas temperature raises, and easily makes superheater and reheater overtemperature.A large amount of tertiary airs are sent into primary combustion zone, and coal dust is mixed at primary combustion zone with a large amount of air, and fractional combustion weak effect, is unfavorable for controlling the generation of NOx.
The one band tertiary air low-NOx combustor that the utility model provides, avoids tertiary air air-flow once to enter in a large number the stability of burner hearth to boiler combustion not affecting catch fire in the situation that, and generation and the boiler economy of controlling NOx have a negative impact.
Brief description of the drawings
Fig. 1 is 1 one kinds of band tertiary air low-NOx combustors of embodiment.
Fig. 2 is embodiment 1 burner nozzle view.
Fig. 3 is 2 one kinds of band tertiary air low-NOx combustors of embodiment.
Fig. 4 is embodiment 2 burner nozzle views.
description of reference numerals
1,1a----case shell, 2, airduct of 2a----, 3, the dense tertiary air sleeve pipe of 3a----, 4,4a----superfine powder separates
Device, 5,5a----nozzle housing, 6,6a----nozzle center, 7,7a----nozzle inside casing, 8,8a----gusset,
9,9a----tertiary air pipeline.10, the light tertiary air sleeve pipe of 10a----.
Detailed description of the invention
For the utility model is become apparent, hereby with two preferred embodiments, and coordinate accompanying drawing to elaborate.
embodiment 1: a kind of band tertiary air low-NOx combustor.
Fig. 1 is 1 one kinds of band tertiary air low-NOx combustors of embodiment, Fig. 2 is embodiment 1 burner nozzle view, the one band tertiary air low-NOx combustor that the utility model provides, is characterized in that: burner is made up of case shell (1), coal nozzle, an airduct (2), tertiary air sleeve pipe (3) and superfine powder separator (4).Secondary Air enters by coal nozzle and sends into burner hearth from case shell (1), and case shell (1) is played a supporting role to an airduct (1), tertiary air sleeve pipe (3) and coal nozzle simultaneously; An airduct (2) becomes shaped as frame, and one end is connected with coal nozzle, and the other end is connected with pulverized coal channel; Tertiary air sleeve pipe (3) is enclosed within the outside of an airduct (2), and four sides have and the width of every side is wide, and one end is connected with microfine coal separator (4) through case shell (1), and the other end is connected with coal nozzle; Coal nozzle is made up of nozzle housing (5), nozzle center (6) and nozzle inside casing (7), nozzle inside casing (7) is connected with an airduct (2), general mood stream enters coal nozzle inside casing (7) by airduct (2) once, inject burner hearth by coal nozzle inside casing (7), nozzle center (6) is connected with tertiary air sleeve pipe (3), and being connected with tertiary air sleeve pipe (3), correspondence is arranged in four sides of coal nozzle and the width of every side is wide; Nozzle housing (5) is for sending Secondary Air air-flow into burner hearth.Nozzle inside casing (7), nozzle center (6) and nozzle housing (5) are connected by gusset (8), and whole nozzle is fixed on an airduct (2); Tertiary air air-flow is divided into deep or light two strands of air-flows after superfine powder separator (4), dense tertiary air air-flow enters tertiary air sleeve pipe (3), light tertiary air air-flow whereabouts is not within the scope of the utility model, can be incorporated to Secondary Air and enter burner hearth by overfire air jet, also can be used as separation after-flame wind and send into burner hearth, also can the coal dust of light tertiary air air-flow be separated by other devices, air-flow after treatment directly discharges etc.
This band tertiary air low-NOx combustor, change the disposable burner hearth mode of sending in a large number of traditional tertiary air, send into from coal nozzle concentrated the fine breeze of tertiary air, form hot blast (Secondary Air) bag thin powdered coal (concentrated tertiary air) at coal nozzle outlet ecto-entad, thin powdered coal (concentrated tertiary air) bag thick coal culm (wind) form, coal dust classification is sent into and is formed coal powder density gradient, and the gentle wind-warm syndrome of tertiary air is more or less the same, very little on coal powder ignition impact.The mode of sending into from coal nozzle after this tertiary air is concentrated has avoided tertiary air all to send on top, main burner region, because tertiary air temperature is low, furnace flame temperature is reduced, combustion instability; Tertiary air is close to furnace outlet, and temperature is low, and burning time is short, easily causes fly ash combustible material to increase; Flame is spun out, and furnace outlet gas temperature raises, and easily makes superheater and reheater overtemperature.A large amount of tertiary airs are sent into primary combustion zone, and coal dust is mixed at primary combustion zone with a large amount of air, and fractional combustion weak effect, is unfavorable for controlling the generation of NOx.
The one band tertiary air low-NOx combustor that the present embodiment provides, has a negative impact not affecting generation and the boiler economy having avoided catch fire in the situation that tertiary air air-flow once to enter in a large number the stability of burner hearth to boiler combustion, controlled NOx.
embodiment 2: a kind of band tertiary air low-NOx combustor.
Fig. 3 is 2 one kinds of band tertiary air low-NOx combustors of embodiment, Fig. 4 is embodiment 2 burner nozzle views, the one band tertiary air low-NOx combustor that the utility model provides, is characterized in that: burner is made up of case shell (1a), coal nozzle, an airduct (2a), tertiary air sleeve pipe (3a) and superfine powder separator (4a).Secondary Air enters by coal nozzle and sends into burner hearth from case shell (1a), and case shell (1a) is played a supporting role to an airduct (1a), tertiary air sleeve pipe (3a) and coal nozzle simultaneously; An airduct (2a) becomes shaped as frame, and one end is connected with coal nozzle, and the other end is connected with pulverized coal channel; Tertiary air sleeve pipe (3a) is enclosed within the back-fire side of an airduct (2a), and one end is connected with microfine coal separator (4a) through case shell (1a), and the other end is connected with coal nozzle; Coal nozzle is made up of nozzle housing (5a), nozzle center (6a) and nozzle inside casing (7a), nozzle inside casing (7a) is connected with an airduct (2a), general mood stream enters coal nozzle inside casing (7a) by airduct (2a) once, inject burner hearth by coal nozzle inside casing (7a), nozzle center (6a) is connected with tertiary air sleeve pipe (3a), and the correspondence that is connected with tertiary air sleeve pipe (3a) is arranged in the back-fire side of coal nozzle; Nozzle housing (5a) is for sending Secondary Air air-flow into burner hearth.Nozzle inside casing (7a), nozzle center (6a) and nozzle housing (5a) are connected by gusset (8a), and whole nozzle is fixed on an airduct (2a).Tertiary air air-flow is divided into deep or light two strands of air-flows after superfine powder separator (4a), dense tertiary air air-flow enters tertiary air sleeve pipe (3a), light tertiary air air-flow whereabouts is not within the scope of the utility model, can be incorporated to Secondary Air and enter burner hearth by overfire air jet, also can be used as separation after-flame wind and send into burner hearth, also can the coal dust of light tertiary air air-flow be separated by other devices, air-flow after treatment directly discharges etc.
This band tertiary air low-NOx combustor, change the disposable burner hearth mode of sending in a large number of traditional tertiary air, send into from coal nozzle concentrated the fine breeze of tertiary air, go out interruption-forming hot blast (Secondary Air) bag thin powdered coal (concentrated tertiary air) at coal nozzle, thin powdered coal (concentrated tertiary air) bag thick coal culm (wind) form, coal dust classification is sent into and is formed coal powder density gradient, and the gentle wind-warm syndrome of tertiary air is more or less the same, very little on coal powder ignition impact.The mode of sending into from coal nozzle after this tertiary air is concentrated has avoided tertiary air all to send on top, main burner region, because tertiary air temperature is low, furnace flame temperature is reduced, combustion instability; Tertiary air is close to furnace outlet, and temperature is low, and burning time is short, easily causes fly ash combustible material to increase; Flame is spun out, and furnace outlet gas temperature raises, and easily makes superheater and reheater overtemperature.A large amount of tertiary airs are sent into primary combustion zone, and coal dust is mixed at primary combustion zone with a large amount of air, and fractional combustion weak effect, is unfavorable for controlling the generation of NOx.
The one band tertiary air low-NOx combustor that the present embodiment provides, avoids tertiary air air-flow once to enter in a large number stability and the boiler economy of burner hearth to boiler combustion catch fire in the situation that having a negative impact not affecting.
Claims (7)
1. a band tertiary air low-NOx combustor, is characterized in that: burner is by case shell (1, 1a), coal nozzle, an airduct (2, 2a), tertiary air sleeve pipe (3, 3a) and superfine powder separator (4, 4a) composition, one time airduct one end is connected with coal nozzle, and the other end is connected with pulverized coal channel, tertiary air sleeve pipe (3, 3a) be enclosed within airduct (2 one time, outside 2a), one end is through case shell (1, 1a) with microfine coal separator (4, 4a) be connected, the other end is connected with coal nozzle, and coal nozzle is by nozzle housing (5, 5a), nozzle center (6, 6a) and nozzle inside casing (7, 7a) form nozzle inside casing (7, 7a) with an airduct (2, 2a) be connected, nozzle center (6, 6a) with tertiary air sleeve pipe (3, 3a) be connected, nozzle inside casing (7, 7a), nozzle center (6, 6a) with nozzle housing (5, 5a) by gusset (8, 8a) be connected, whole nozzle is fixed on airduct (2 one time, 2a) or case shell (1, 1a), tertiary air pipeline is connected in superfine powder separator (4,4a), and superfine powder separator (4,4a) one end is connected in dense tertiary air sleeve pipe (3,3a), and the other end connects light tertiary-air pipe (10,10a).
2. a kind of band tertiary air low-NOx combustor as claimed in claim 1, is characterized in that: described tertiary air sleeve pipe (3,3a) is enclosed within any side of a described airduct (2,2a) or both sides or any three sides or surrounding arbitrarily.
3. a kind of band tertiary air low-NOx combustor as claimed in claim 1, is characterized in that: the width that described tertiary air sleeve pipe (3,3a) is enclosed within the every side of a described airduct (2,2a) is wide.
4. a kind of band tertiary air low-NOx combustor as claimed in claim 1, is characterized in that: the width that described tertiary air sleeve pipe (3,3a) is enclosed within the every side of a described airduct (2,2a) is not wide.
5. a kind of band tertiary air low-NOx combustor as claimed in claim 1, is characterized in that: described nozzle center (6,6a) is arranged in any side of described coal nozzle inside casing (7,7a) or both sides or any three sides or surrounding arbitrarily.
6. a kind of band tertiary air low-NOx combustor as claimed in claim 1, is characterized in that: the width that described nozzle center (6,6a) is arranged in the every side of described coal nozzle inside casing (7,7a) is wide.
7. a kind of band tertiary air low-NOx combustor as claimed in claim 1, is characterized in that: the width that described nozzle center (6,6a) is arranged in the every side of described coal nozzle inside casing (7,7a) is not wide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420060470.2U CN203718765U (en) | 2014-02-10 | 2014-02-10 | Low-NOx burner with tertiary air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420060470.2U CN203718765U (en) | 2014-02-10 | 2014-02-10 | Low-NOx burner with tertiary air |
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| Publication Number | Publication Date |
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| CN203718765U true CN203718765U (en) | 2014-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420060470.2U Expired - Fee Related CN203718765U (en) | 2014-02-10 | 2014-02-10 | Low-NOx burner with tertiary air |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105782966A (en) * | 2016-03-15 | 2016-07-20 | 华中科技大学 | Dual-mode pulverized coal burner and boiler burner system |
| CN106196020A (en) * | 2015-05-06 | 2016-12-07 | 上海四方锅炉集团工程成套股份有限公司 | The tertiary air of pulverized-coal fired boiler is made into the method and device that First air carries out burning |
| CN107250668A (en) * | 2015-03-31 | 2017-10-13 | 三菱日立电力***株式会社 | Burner and the boiler for possessing the burner |
| US10591154B2 (en) | 2015-03-31 | 2020-03-17 | Mitsubishi Hitachi Power Systems, Ltd. | Combustion burner and boiler |
| US10677457B2 (en) | 2015-09-11 | 2020-06-09 | Mitsubishi Hitachi Power Systems, Ltd. | Combustion burner and boiler equipped with the same |
-
2014
- 2014-02-10 CN CN201420060470.2U patent/CN203718765U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107250668A (en) * | 2015-03-31 | 2017-10-13 | 三菱日立电力***株式会社 | Burner and the boiler for possessing the burner |
| US10458645B2 (en) | 2015-03-31 | 2019-10-29 | Mitsubishi Hitachi Power Systems, Ltd. | Combustion burner and boiler provided with same |
| US10591154B2 (en) | 2015-03-31 | 2020-03-17 | Mitsubishi Hitachi Power Systems, Ltd. | Combustion burner and boiler |
| CN106196020A (en) * | 2015-05-06 | 2016-12-07 | 上海四方锅炉集团工程成套股份有限公司 | The tertiary air of pulverized-coal fired boiler is made into the method and device that First air carries out burning |
| US10677457B2 (en) | 2015-09-11 | 2020-06-09 | Mitsubishi Hitachi Power Systems, Ltd. | Combustion burner and boiler equipped with the same |
| CN105782966A (en) * | 2016-03-15 | 2016-07-20 | 华中科技大学 | Dual-mode pulverized coal burner and boiler burner system |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20140716 Termination date: 20170210 |
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| CF01 | Termination of patent right due to non-payment of annual fee |