CN203857481U - Secondary air regulating device for coal powder boiler - Google Patents
Secondary air regulating device for coal powder boiler Download PDFInfo
- Publication number
- CN203857481U CN203857481U CN201420208295.7U CN201420208295U CN203857481U CN 203857481 U CN203857481 U CN 203857481U CN 201420208295 U CN201420208295 U CN 201420208295U CN 203857481 U CN203857481 U CN 203857481U
- Authority
- CN
- China
- Prior art keywords
- secondary air
- air regulation
- regulating
- pulverized
- fired boiler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 239000003245 coal Substances 0.000 title claims abstract description 23
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 18
- 239000000843 powder Substances 0.000 title abstract description 5
- 230000006978 adaptation Effects 0.000 claims description 3
- 239000002817 coal dust Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000003467 diminishing effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Abstract
The utility model discloses a secondary air regulating device for a coal powder boiler. The secondary air regulating device for the coal powder boiler comprises a plurality of groups of secondary air regulating doors arranged in an air feeding pipe; the groups of secondary air regulating doors are arranged in one row along the direction vertical to the airflow direction; each group of secondary air regulating door comprises two regulating blades for regulating the air volume of the air feeding pipe; rotary shafts are arranged at the ends of the regulating blades; the rotary shafts are rotationally arranged on the inner wall of the air feeding pipe. According to the secondary air regulating device for the coal powder boiler, the rotary shafts are arranged at the ends of the regulating blades, and each group of regulating blades forms an air duct with gradually reduced through flow area when the regulating blades are opened for air feeding, so the regulating property of the regulating doors is improved.
Description
Technical field
The utility model relates to large coal-fired power plant coal powder boiler combustion control field, is specifically related to the secondary air regulation device of pulverized-coal fired boiler.
Background technology
Pulverized-coal fired boiler is the boiler plant taking coal dust as fuel, and this boiler plant is all furnished with tens coal burners conventionally, and is furnished with primary and secondary air air distribution device, and wherein, the Main Function of a wind is that pulverized coal conveying is to burner hearth and ensure sufficient ignition.Secondary wind action aftercombustion required air quantity, ensures that fuel combustion is complete.Coal dust is carried and is entered burner hearth through burner by a wind, Secondary Air is by the Secondary Air annular air channel of burner or introduce burner hearth adjacent to the overfiren air port of burner nozzle, fuel burns under suspended state, therefore have burning rapidly, completely, capacity is large, efficiency is high, it is wide to adapt to coal, is convenient to the advantages such as control and regulation.
In pulverized-coal fired boiler, because the time that coal dust stops in burner hearth is very short, only there is the time of 1～2 second, within the short like this time, to ensure coal dust after-flame in stove, the proportioning that must rationally adjust primary and secondary air, to create good burning condition, ensures boiler safety and economic operation reliably.
Existing pulverized-coal fired boiler secondary air regulation door adopts venetian blind type, as shown in Figure 1, Figure 2 and Figure 3, the turning cylinder of adjusting vane is arranged on its center, thus, in the time that adjustment secondary air regulation door is opened, to form negative pressuren zone and produce eddy current at the lee face of adjusting vane, cannot carry out linear regulation to the Secondary Air that enters burner.
Utility model content
Technical problem to be solved in the utility model is to solve the poor problem of adjusting function that existing pulverized-coal fired boiler enters the Secondary Air of burner.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is to provide a kind of secondary air regulation device of pulverized-coal fired boiler, comprise some groups of secondary air regulation doors that are arranged in ajutage, and described in some groups, secondary air regulation door is along arranging in a row perpendicular to airflow direction, described in every group, secondary air regulation door comprises two adjusting vanes for regulating ajutage air output size, one end of described adjusting vane is provided with turning cylinder, and described turning cylinder rotates and is arranged on the inwall of ajutage.
In such scheme, described secondary air regulation door adopts many groups, is close to described in two adjacent groups to arrange or interval arranges between secondary air regulation door.
In such scheme, described adjusting vane is the curved surfaces of indent towards the surface of air-flow.
In such scheme, two relative sides of described adjusting vane are ramped shaped, and two relative described adjusting vanes are relatively most advanced and sophisticated.
In such scheme, described secondary air regulation door adopts one group, and two described adjusting vanes are arranged to splice conglobate two semicircles, the internal diameter adaptation of described half radius of a circle and described blast pipe.
The utility model, the secondary air regulation device that adopts pulverized-coal fired boiler, its turning cylinder is arranged on one end of adjusting vane, in the time of adjusting vane open mode air intake, every group of adjusting vane formed a diminishing air channel of flow area, thereby improved the adjusting function of adjustment doors.
Brief description of the drawings
Fig. 1 is the structural representation of existing adjustment doors while not opening;
Fig. 2 is the structural representation of the first kind of way of existing adjustment doors while opening certain angle;
Fig. 3 is the structural representation of the second way of existing adjustment doors while opening certain angle;
Fig. 4 is structural representation when secondary air regulation door is not opened in the utility model embodiment 1;
Fig. 5 is structural representation when secondary air regulation door is opened certain angle in the utility model embodiment 1;
Fig. 6 is front view when secondary air regulation door is opened certain angle in the utility model embodiment 2;
Fig. 7 is left view when secondary air regulation door is opened certain angle in the utility model embodiment 2.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in detail.
As shown in Figures 4 to 7, the utility model provides a kind of secondary air regulation device of pulverized-coal fired boiler, comprise uniform some groups of secondary air regulation doors and drive unit and the control module being arranged in ajutage, and some groups of secondary air regulation doors are in a row along arranging perpendicular to airflow direction, be close to and arrange or interval setting between two adjacent groups secondary air regulation door.
Every group of secondary air regulation door comprises two adjusting vanes 1 for regulating ajutage air output size, and one end of adjusting vane 1 is provided with turning cylinder 2, and turning cylinder 2 rotates and is arranged on the inwall of ajutage.
Drive unit is fixedly installed in ajutage, and drive unit is connected with adjusting vane.Drive unit adopts motor.
Control module is measured result of calculation according to air-fuel ratio current in corresponding burner or excess air coefficient, send corresponding control signal, drive unit drives adjusting vane to rotate corresponding angle according to control signal, thereby increase or reduce the aperture of secondary air regulation door, change the flow area of ajutage air outlet, and then change the air force of ajutage inner second air.
Embodiment 1: as shown in Figure 4 and Figure 5, if adopt the blast pipe of rectangle, can adopt one group or organize secondary air regulation door more, its turning cylinder is arranged on one end of adjusting vane, be outermost end or inner terminal, form door-opening type adjustment doors, its adjusting vane can be arranged to strip plate, realizes secondary air regulation by switching; Adjusting vane also can be arranged to be towards the surface of air-flow the curved surfaces of indent.This structure forms buffering, resistance while weakening air intake at the curved surfaces of indent.In the present embodiment, adjusting vane is arranged to two relative sides and is ramped shaped, and two relative adjusting vanes are relatively most advanced and sophisticated.The resistance that when this structure effectively weakens air intake, adjusting vane itself produces, makes Secondary Air directly circulate along hypotenuse.
Embodiment 2: as shown in Figure 6 and Figure 7, if adopt circular blast pipe, secondary air regulation door adopts one group, and two adjusting vanes are arranged to splice conglobate two semicircles, its turning cylinder is arranged on one end of adjusting vane, be inner terminal, form butterfly-like adjustment doors, the internal diameter adaptation of its half radius of a circle and blast pipe.
The utility model, the secondary air regulation device that adopts pulverized-coal fired boiler, its turning cylinder is arranged on one end of adjusting vane, in the time of adjusting vane open mode air intake, every group of adjusting vane formed a diminishing air channel of flow area, thereby improved the adjusting function of adjustment doors.
The utility model is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, within all falling into protection domain of the present utility model.
Claims (5)
1. the secondary air regulation device of pulverized-coal fired boiler, it is characterized in that, comprise some groups of secondary air regulation doors that are arranged in ajutage, and described in some groups, secondary air regulation door is along arranging in a row perpendicular to airflow direction, described in every group, secondary air regulation door comprises two adjusting vanes for regulating ajutage air output size, one end of described adjusting vane is provided with turning cylinder, and described turning cylinder rotates and is arranged on the inwall of ajutage.
2. the secondary air regulation device of pulverized-coal fired boiler as claimed in claim 1, is characterized in that, described secondary air regulation door adopts many groups, is close to described in two adjacent groups to arrange or interval arranges between secondary air regulation door.
3. the secondary air regulation device of pulverized-coal fired boiler as claimed in claim 1, is characterized in that, described adjusting vane is the curved surfaces of indent towards the surface of air-flow.
4. the secondary air regulation device of pulverized-coal fired boiler as claimed in claim 3, is characterized in that, two relative sides of described adjusting vane are ramped shaped, and two relative described adjusting vanes are relatively most advanced and sophisticated.
5. the secondary air regulation device of pulverized-coal fired boiler as claimed in claim 1, it is characterized in that, described secondary air regulation door adopts one group, and two described adjusting vanes are arranged to splice conglobate two semicircles, the internal diameter adaptation of described half radius of a circle and described blast pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420208295.7U CN203857481U (en) | 2014-04-25 | 2014-04-25 | Secondary air regulating device for coal powder boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420208295.7U CN203857481U (en) | 2014-04-25 | 2014-04-25 | Secondary air regulating device for coal powder boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203857481U true CN203857481U (en) | 2014-10-01 |
Family
ID=51607328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420208295.7U Expired - Lifetime CN203857481U (en) | 2014-04-25 | 2014-04-25 | Secondary air regulating device for coal powder boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203857481U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912894A (en) * | 2014-04-25 | 2014-07-09 | 青岛立宇科技开发有限公司 | Secondary air adjustment device of pulverized coal fired boiler |
-
2014
- 2014-04-25 CN CN201420208295.7U patent/CN203857481U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912894A (en) * | 2014-04-25 | 2014-07-09 | 青岛立宇科技开发有限公司 | Secondary air adjustment device of pulverized coal fired boiler |
| CN103912894B (en) * | 2014-04-25 | 2016-07-06 | 青岛立宇科技开发有限公司 | The secondary air regulation device of pulverized-coal fired boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141001 |