CN202229175U - Boiler with three-level air-distribution combustion system - Google Patents
Boiler with three-level air-distribution combustion system Download PDFInfo
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- CN202229175U CN202229175U CN2011203071994U CN201120307199U CN202229175U CN 202229175 U CN202229175 U CN 202229175U CN 2011203071994 U CN2011203071994 U CN 2011203071994U CN 201120307199 U CN201120307199 U CN 201120307199U CN 202229175 U CN202229175 U CN 202229175U
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Abstract
The utility model relates to a three-level air-distribution combustion system for combusting swirl powder including coal powder. A boiler with the three-level air-distribution combustion system comprises a swirl combustor, a hearth and a triple air pipe, wherein the swirl combustor is arranged at the end part of the hearth and comprises a primary air pipe and a secondary air channel; an inlet end of the secondary air channel is connected with a secondary air pipe; an inlet end of the triple air pipe is connected with the secondary air pipe or the secondary air channel, or separately connected into a fan; and an outlet end of the triple air pipe is connected with the hearth. The three-level air-distribution combustion system can be widely applied to small and medium industrial boilers and industrial kilns combusting powder fuels including the coal powder.
Description
Technical field
The utility model relates to a kind of middle-size and small-size Industrial Boiler and Industrial Stoves that use the powder fuel that comprises coal dust and be provided with three grades of air distribution combustion systems of eddy flow powder.
Background technology
China's coal-burned industrial boiler is in the majority with grate firing boiler, and inefficiency, and average operating efficiency is about 60%～65%, adopts the pulverized-coal fired boiler of suspension combustion mode that higher boiler efficiency is then arranged.Pulverized-coal fired boiler in the past all is some large-sized station boilers, seldom is used for the Industrial Boiler field.Along with the development of technology such as coal dust processing, accumulating, and pulverized coal combustion makes middle-size and small-size pulverized-coal fired boiler be able to develop rapidly in the successful Application of middle-size and small-size Industrial Boiler.The burner of present middle-size and small-size industrial coal powder boiler adopts vortex burner usually; It has that air classification is supplied with, rotation air intake, the steady characteristics of combustion and flame combustion adjustable positions; The working method of its combustion system is generally coal dust and is sprayed in the stove by an airduct of turbulent burner; Air is sprayed into by the secondary air channel (like central tube, interior secondary air channel and outer secondary air channel) of burner, such as patent " a kind of coal powder burner " (application number: 200520002172.9).But problems such as existing middle-size and small-size pulverized-coal fired boiler exists, and unburned combustible in fly ash is high, the coal adaptation is poor, burner hearth deashing difficulty.
Summary of the invention
The purpose of the utility model provides a kind of middle-size and small-size Industrial Boiler and Industrial Stoves that are used to use the powder fuel that comprises coal dust and are provided with three grades of air distribution combustion systems of eddy flow powder, has the problem that unburned combustible in fly ash is high, the coal adaptation is poor, the burner hearth deashing is difficult to solve existing middle-size and small-size pulverized-coal fired boiler.
To achieve these goals, the utility model adopts following technical scheme:
A kind of boiler that is provided with three grades of air distribution combustion systems, it comprises combustion system, described combustion system comprises eddy flow powder burner, burner hearth and three grades of air distribution combustion systems; Described turbulent burner is arranged in the end of burner hearth, between burner and burner hearth, is provided with the mixed flow passage; Described eddy flow powder burner comprises wind passage and secondary air channel, and the outlet of wind passage and secondary air channel has one section mixed flow passage.Three grades of air distribution combustion systems comprise airduct, secondary air channel and tertiary-air pipe one time; One time airduct, secondary air channel are connected with secondary air channel with a wind passage of eddy flow powder burner respectively; The port of export of described tertiary-air pipe is connected with burner hearth; The arrival end of tertiary-air pipe is connected with secondary air channel, or inserts blower fan separately and send into air or flue gas recycled.
The described three grades of air distribution combustion systems of the utility model constitute three grades of air distributions by wind, secondary wind and a tertiary air; Powder fuel is sent into through an airduct by a wind; Secondary wind gets into secondary air channel through secondary air channel and reaches the eddy flow state; The primary wind and powder mixture burns in mixed flow passage mixing postignition with swirl secondary air, and the air-flow that catches fire mixes with tertiary air after spraying into burner hearth, reaches abundant burning.
Tertiary-air pipe can be one or more pipe.
Powder mainly refers to comprise the solid powder fuel of coal dust, living beings powder.The living beings powder comprises wood chip, shell powder, straw powder material.
The utility model adopts three grades of air distribution combustion systems, has following beneficial effect for coal dust burning:
1, because total air distribution is certain, and tertiary air occupies certain ratio, reduce through the air quantity of participating in coal dust firing behind the burner like this, coal powder density suitably improves.The raising of coal powder density in the recirculating zone helps igniting temperature of pulverized-coal decline and catches fire shifting to an earlier date, thereby can shorten ignition time, reduces ignition heat, improves flame holding.
2, breeze airflow and swirl secondary air mix with tertiary air after the thick coal culm air-flow catches fire, and form fractional combustion.Like this coal powder ignition initial stage, belong to low oxygen combustion, can suppress the generation of NOX effectively.Catch fire the later stage, tertiary air is sneaked into combustion-supporting along the range direction, further provides coal dust firing to burning required oxygen amount, reaches abundant burning.
3, for horizontal boiler, the breeze airflow of swirl flow combustion has part flyash and in process of flowing, is deposited on burner hearth bottom after getting into the burner hearth burning.Because the tertiary-air pipe outlet is at the downside of burner hearth end, preposition after-blow can make the burner hearth bottom dust stratification under the perturbation action of tertiary air, add eddy flow once more, thereby reach the deashing function.
4, the perturbation action of tertiary air helps improving the flow operating mode of flue gas in stove, has strengthened the later stage of burning jet and has mixed, and helps catching fire of coal dust and burns.Make simultaneously to move down or the coal dust that does not burn of sedimentation adds eddy flow once more under the effect of disturbance, prolong the time that fuel gas and flying dust stop in stove, the solid incomplete combustion loss and the gas incomplete combustion loss of minimizing boiler.
5, owing to reduced ignition heat; Help the lighting of coal dust, smooth combustion, strengthened the mixing between the pulverized coal particle of burning later stage air and burning, prolonged the time of staying of coal dust in stove; Thereby reduced the requirement of boiler, improved the adaptability of coal ature of coal.
Description of drawings
Fig. 1 is three grades of air distribution combustion systems of eddy flow powder layout drawing of the employing tertiary air of horizontal layout.
Fig. 2 is three grades of air distribution combustion systems of eddy flow powder layout drawing that adjusting device is arranged.
Fig. 3 is the eddy flow powder three grade air distribution combustion system layout drawing of tertiary air by the blower fan air feed.
Fig. 4 is the eddy flow powder three grade air distribution combustion system layout drawing of tertiary air by the secondary air channel air feed.
Fig. 5 is three grades of air distribution combustion systems of eddy flow powder layout drawing of the employing tertiary-air pipe of vertical layout.
Fig. 6 is three grades of air distribution combustion systems of eddy flow powder layout drawing in the employing tertiary air hoop air channel of vertical layout.
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the utility model is done to describe in further detail.
Embodiment one:In conjunction with Fig. 1 this embodiment is described, the said three grades of air distribution combustion systems of this mode constitute three grades of air distributions by wind, secondary wind and a tertiary air, comprise eddy flow powder burner 1, burner hearth 2 and tertiary-air pipe 3, the horizontal layout of burner hearth.Described eddy flow powder burner 1 is arranged in the end of burner hearth 2, between burner 1 and burner hearth 2, is provided with mixed flow passage 7.Described eddy flow powder burner comprises that the airduct 5 and the outlet of 6, airducts of secondary air channel 5 and secondary air channel 6 have one section mixed flow passage 7.The arrival end of described secondary air channel 6 is connected with secondary air channel 4.The port of export of described tertiary-air pipe 3 is connected with burner hearth 2, and the arrival end of tertiary-air pipe 3 is connected with secondary air channel 4.Tertiary-air pipe 3 can be one or more pipe.
Embodiment two: combine Fig. 1 and Fig. 2 that this embodiment is described, the described three grades of air distribution combustion systems of this mode are equipped with secondary wind adjusting device 8 at the air inlet place of burner secondary air channel 6, and the air inlet place of described tertiary-air pipe 3 is equipped with tertiary air adjusting device 9.Can control the air quantity that gets into burner secondary wind and entering burner hearth tertiary air through adjustment secondary wind adjusting device 8 and tertiary air adjusting device 9.Other composition and annexation are identical with the specific embodiment one.
Embodiment three:In conjunction with Fig. 1 and Fig. 3 this embodiment is described, the tertiary-air pipe 3 of the described three grades of air distribution combustion systems of this mode inserts tertiary air machine 10 separately, and what blower fan sucked can be that air also can be a flue gas recycled.Can control the air quantity that gets into the burner hearth tertiary air through adjustment tertiary air adjusting device 9.Other composition and annexation are identical with the specific embodiment one.
Embodiment four:In conjunction with Fig. 1 and Fig. 4 this embodiment is described, the arrival end of the tertiary-air pipe 3 of the described three grades of air distribution combustion systems of this mode is connected with secondary air channel 6.The arrival end of secondary air channel 4 and tertiary-air pipe 3 can be installed volume adjusting apparatus.Other composition and annexation are identical with the specific embodiment one.
Embodiment five:In conjunction with Fig. 1 and Fig. 5 this embodiment is described, when the described three grades of air distribution combustion systems of this mode are used for the vertical layout of burner hearth, tertiary-air pipe 3 can many hoop be arranged in the periphery of burner.Other composition and annexation are identical with the specific embodiment one.
Embodiment six:In conjunction with Fig. 1 and Fig. 6 this embodiment is described; When the described three grades of air distribution combustion systems of this mode are used for the vertical layout of burner hearth; At the burner outer shroud tertiary air road 11 is set; Tertiary air road inlet is connected to tertiary-air pipe 3, and outlet is connected with burner hearth 2, and tertiary air gets into burner hearth through the outer shroud tertiary air road 11 of burner.Other composition and annexation are identical with the specific embodiment one.
Claims (6)
1. boiler that is provided with three grades of air distribution combustion systems, it comprises combustion system, described combustion system comprises eddy flow powder burner, burner hearth and three grades of air distribution combustion systems; Described turbulent burner is arranged in the end of burner hearth, between burner and burner hearth, is provided with the mixed flow passage; Described eddy flow powder burner comprises wind passage and secondary air channel; The outlet of wind passage and secondary air channel has one section mixed flow passage; It is characterized in that: three grades of air distribution combustion systems comprise airduct, secondary air channel and tertiary-air pipe one time; One time airduct, secondary air channel are connected with secondary air channel with a wind passage of eddy flow powder burner respectively; The port of export of described tertiary-air pipe is connected with burner hearth, and the arrival end of tertiary-air pipe is connected with secondary air channel, or inserts blower fan separately and send into air or flue gas recycled.
2. three grades of air distribution combustion systems of eddy flow powder according to claim 1; It is characterized in that said combustion system is equipped with the secondary wind regulating device of air door at the air inlet place of burner secondary air duct, the tertiary air adjusting device is installed at the air inlet place of described tertiary-air pipe.
3. three grades of air distribution combustion systems of eddy flow powder according to claim 1 is characterized in that tertiary-air pipe directly connects blower fan.
4. three grades of air distribution combustion systems of eddy flow powder according to claim 1 is characterized in that tertiary-air pipe by the secondary air channel air feed, and the arrival end of secondary air channel and tertiary-air pipe can be installed volume adjusting apparatus.
5. three grades of air distribution combustion systems of eddy flow powder according to claim 1 is characterized in that described combustion system adopts the burner hearth of vertical layout, and tertiary-air pipe is made up of the periphery that many airduct hoops are arranged in burner.
6. three grades of air distribution combustion systems of eddy flow powder according to claim 1 is characterized in that at the burner outer shroud tertiary air road being set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203071994U CN202229175U (en) | 2011-08-23 | 2011-08-23 | Boiler with three-level air-distribution combustion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203071994U CN202229175U (en) | 2011-08-23 | 2011-08-23 | Boiler with three-level air-distribution combustion system |
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| Publication Number | Publication Date |
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| CN202229175U true CN202229175U (en) | 2012-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203071994U Expired - Fee Related CN202229175U (en) | 2011-08-23 | 2011-08-23 | Boiler with three-level air-distribution combustion system |
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| CN (1) | CN202229175U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969347A (en) * | 2017-05-16 | 2017-07-21 | 中煤科工清洁能源股份有限公司 | A kind of boiler with the fiery device of lock |
-
2011
- 2011-08-23 CN CN2011203071994U patent/CN202229175U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969347A (en) * | 2017-05-16 | 2017-07-21 | 中煤科工清洁能源股份有限公司 | A kind of boiler with the fiery device of lock |
| CN106969347B (en) * | 2017-05-16 | 2023-11-03 | 中煤科工清洁能源股份有限公司 | Boiler with fire locking device |
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| 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: 20120523 Termination date: 20170823 |
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| CF01 | Termination of patent right due to non-payment of annual fee |