CN103912894A - Secondary air adjustment device of pulverized coal fired boiler - Google Patents
Secondary air adjustment device of pulverized coal fired boiler Download PDFInfo
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- CN103912894A CN103912894A CN201410171024.3A CN201410171024A CN103912894A CN 103912894 A CN103912894 A CN 103912894A CN 201410171024 A CN201410171024 A CN 201410171024A CN 103912894 A CN103912894 A CN 103912894A
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- secondary air
- air regulation
- fired boiler
- coal fired
- adjustment
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Abstract
The invention discloses a secondary air adjustment device of a pulverized coal fired boiler. The secondary air adjustment device of the pulverized coal fired boiler comprises a plurality of sets of secondary air adjustment doors arranged in an air feeding pipe, the multiple sets of secondary air adjustment doors are arranged in a row in the direction perpendicular to air flow, each set of secondary air adjustment door comprises two adjustment vanes used for adjusting the air feeding amount of the air feeding pipe, a rotary shaft is arranged at one end of each adjustment vane, and the rotary shafts are arranged on the inner wall of the air feeding pipe in a rotary mode. According to the secondary air adjustment device of the pulverized coal fired boiler, each rotary shaft is arranged at one end of the corresponding adjustment vane, when the adjustment vanes are in an open state for air feeding, each set of adjustment vanes form an air flue with the through flow area gradually decreasing, and therefore the adjustment performance of the adjustment doors is improved.
Description
Technical field
The present invention relates to large coal-fired power plant coal powder boiler combustion control field, be specifically related to the secondary air regulation device of pulverized-coal fired boiler.
Background technology
Pulverized-coal fired boiler is the boiler plant take 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 guarantee sufficient ignition.Secondary wind action aftercombustion required air quantity, guarantees 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 guarantee coal dust after-flame in stove, the proportioning that must rationally adjust primary and secondary air, to create good burning condition, guarantees 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.
Summary of the invention
Technical problem to be solved by this invention 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 solution adopted in the present invention 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 present invention, 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.
Accompanying drawing explanation
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 embodiment of the present invention 1;
Fig. 5 is structural representation when secondary air regulation door is opened certain angle in the embodiment of the present invention 1;
Fig. 6 is front view when secondary air regulation door is opened certain angle in the embodiment of the present invention 2;
Fig. 7 is left view when secondary air regulation door is opened certain angle in the embodiment of the present invention 2.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
As shown in Figures 4 to 7, the invention 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 present invention, 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 present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, within all falling into protection scope of the present invention.
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 |
|---|---|---|---|
| CN201410171024.3A CN103912894B (en) | 2014-04-25 | 2014-04-25 | The secondary air regulation device of pulverized-coal fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410171024.3A CN103912894B (en) | 2014-04-25 | 2014-04-25 | The secondary air regulation device of pulverized-coal fired boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103912894A true CN103912894A (en) | 2014-07-09 |
| CN103912894B CN103912894B (en) | 2016-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410171024.3A Active CN103912894B (en) | 2014-04-25 | 2014-04-25 | The secondary air regulation device of pulverized-coal fired boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113154442A (en) * | 2021-03-10 | 2021-07-23 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Intelligent and accurate secondary air adjusting system of direct-current combustor |
| CN115888963A (en) * | 2022-09-19 | 2023-04-04 | 山东大学 | Coal pulverizer entry primary air volume governing system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4249571A (en) * | 1979-04-06 | 1981-02-10 | Wehr Corporation | Air control mechanism having noise suppression means |
| JPH0523961Y2 (en) * | 1989-12-15 | 1993-06-18 | ||
| CN202938339U (en) * | 2012-10-19 | 2013-05-15 | 上海锅炉厂有限公司 | Layout structure of electric actuating mechanism for secondary air register |
| CN203857481U (en) * | 2014-04-25 | 2014-10-01 | 青岛立宇科技开发有限公司 | Secondary air regulating device for coal powder boiler |
-
2014
- 2014-04-25 CN CN201410171024.3A patent/CN103912894B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4249571A (en) * | 1979-04-06 | 1981-02-10 | Wehr Corporation | Air control mechanism having noise suppression means |
| JPH0523961Y2 (en) * | 1989-12-15 | 1993-06-18 | ||
| CN202938339U (en) * | 2012-10-19 | 2013-05-15 | 上海锅炉厂有限公司 | Layout structure of electric actuating mechanism for secondary air register |
| CN203857481U (en) * | 2014-04-25 | 2014-10-01 | 青岛立宇科技开发有限公司 | Secondary air regulating device for coal powder boiler |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113154442A (en) * | 2021-03-10 | 2021-07-23 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Intelligent and accurate secondary air adjusting system of direct-current combustor |
| CN113154442B (en) * | 2021-03-10 | 2024-02-27 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Intelligent accurate regulating system for secondary air of direct-current burner |
| CN115888963A (en) * | 2022-09-19 | 2023-04-04 | 山东大学 | Coal pulverizer entry primary air volume governing system |
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| Publication number | Publication date |
|---|---|
| CN103912894B (en) | 2016-07-06 |
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