CN203476764U - Parallel-running axial-flow type primary air fan automatic adjusting apparatus - Google Patents
Parallel-running axial-flow type primary air fan automatic adjusting apparatus Download PDFInfo
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- CN203476764U CN203476764U CN201320527330.7U CN201320527330U CN203476764U CN 203476764 U CN203476764 U CN 203476764U CN 201320527330 U CN201320527330 U CN 201320527330U CN 203476764 U CN203476764 U CN 203476764U
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Abstract
The utility model discloses a parallel-running axial-flow type primary air fan automatic adjusting apparatus. The apparatus comprises more than one axial-flow type primary air fan (1), pneumatic blade opening degree adjusting devices (2), and an air fan pneumatic blade control device (3). The air fan pneumatic blade control device (3) is connected with the pneumatic blade opening degree adjusting devices (2). The apparatus is characterized in that the air fan pneumatic blade control device (3) is connected with an air fan current monitoring and comparing device (4), and the air fan current monitoring and comparing device (4) is connected with the different axial-flow type primary air fans (1). With the adoption of the optimized control strategy, the problems of scramble for air and stalling of the primary air fans are effectively prevented and the automatic adjusting quality of the axial-flow type primary air fans is substantially improved, thereby providing a guarantee for the stability of combustion of a boiler.
Description
Technical field
The utility model relates to a kind of axial flow primary fan automatic control tegulatingdevice of paired running, belongs to thermal power plant's operation control technique field.
Background technique
The fossil-fired unit of joining unit pulverized-coal system is to rely on a wind to complete coal dust to carry, and one time wind is provided by primary air fan.Two high-lift axial flow primary fans of large electric power plant unit one general configuration, all there is Yi Ge unstable operation district in the type blower fan.During two axial flow primary fan paired runnings, if adjust improper (very easily occurring when larger at coal pulverizer input initial stage, system resistance), once the operation point of blower fan enters unstable operation district, will there is stall phenomenon, cause blower fan to exert oneself sharply to decline, system pressure rapid fluctuation, thereby the conveying that makes coal dust occurs to interrupt or quantity delivered fluctuation, and then has a strong impact on the combustion stability of boiler, even causes boiler flameout.
The automatic regulation strategy of axial flow primary fan of current domestic large electric power plant unit paired running is to be based upon on two Fans performances and the on all four basis of operating conditions, depart from on-the-spot actual, there is following problem: drop in automatic situation, the amount that primary air fan movable vane aperture increases or reduces is automatically to divide equally to two Fans, and the operation conditions of two Fans is not differentiated to difference.In fact because coal pulverizer is thrown the difference of stopping state and operating conditions, the system resistance that two primary air fans need to overcome has very big difference, and the movable vane control characteristic of two primary air fans is because the reason of manufacture and alignment error is also not quite similar, therefore two primary air fan movable vanes are taked the synchronous adjusting pattern with width, very easily occur that the blower fan deviation of exerting oneself adjusts larger and larger, finally cause that blower fan tacks, stall.
Summary of the invention
The technical problems to be solved in the utility model is to provide and a kind ofly avoids that primary air fan tacks, stall occurs, the axial flow primary fan automatic control tegulatingdevice of the paired running of total blast modification stability once, to overcome the deficiencies in the prior art.
The technical solution of the utility model is:
The axial flow primary fan automatic control tegulatingdevice of paired running, it comprises above axial flow primary fan, pneumatic leaf opening adjusting device and the pneumatic leaf control gear of blower fan, the pneumatic leaf control gear of blower fan is connected with pneumatic leaf opening adjusting device, is connected with blower fan current monitoring and is connected with different axial flow primary fans respectively with comparison device from comparison device blower fan current monitoring on the pneumatic leaf control gear of blower fan.
Blower fan current monitoring and comparison device by testing current module and size of current to module composition.
It comprises axial flow primary fan, wind motor leaf automatic control module and the blower fan current monitoring and contrast module of an above paired running, on axial flow primary fan, be connected with wind motor leaf opening adjusting device, wind motor leaf opening adjusting device is for regulating the movable vane aperture (i.e. the air quantity of this blower fan) of blower fan.When system changes to the demand of primary air flow, first the electric current of the axial flow primary fan of two paired runnings of blower fan current monitoring and the contrast of contrast module just, and comparing result is offered to wind motor leaf automatic control module, wind motor leaf automatic control module sends the instruction that increases or reduce movable vane aperture to wind motor leaf opening adjusting device to the demand of air quantity according to primary air system subsequently, when system need to increase air quantity, instruction preferentially increases the primary air fan movable vane aperture that electric current is little, otherwise, instruction preferentially reduces the primary air fan movable vane aperture that electric current is large.
Compared with the prior art, the utility model is connecting fan current monitoring and comparing module on the pneumatic leaf automatic controller of existing blower fan, like this primary air fan movable vane is regulated and just can first judge the electric current of two Fans, decide accordingly the movable vane of any Fans first to adjust.Such as: A, two primary air fan paired runnings of B, now system conditions variation requirement increases primary air fan exerts oneself (needing to increase once pneumatic leaf aperture), and now adjusting is answered automatically: (1) first judges the current deviation of two Fans; (2) preferentially increase the movable vane aperture of the blower fan that electric current is low; (3) continue subsequently relatively two Fans electric currents, increase the movable vane aperture of the blower fan that electric current is low, until meet system requirements.Equally, when system conditions variation requirement minimizing primary air fan is exerted oneself (needing to increase once pneumatic leaf aperture), adjusting should preferentially reduce the movable vane aperture of the blower fan that electric current is high automatically.Adopt the control strategy of this optimization effectively to avoid that primary air fan tacks, stall problem, greatly improved the automatic regulation quality of axial flow primary fan, thereby provide guarantee for boiler burning stable; The utility model is easily implemented, practice examining effect is very good, therefore can bring good economic benefit to fired power generating unit, has the meaning of popularization.
After this Automatic Control Strategy is implemented on the 2 * 600MW of Xingyi of Guizhou power plant unit, primary air pressure is controlled very steady automatically, in whole control procedure, within difference between current between two primary air fans can remain on 2A well, once the adjusting of total blast is highly stable, automatic input of wind can from the First grinding machine that puts into operation start until unit band at full capacity, the primary air fan that fundamentally solves the former existence of Liao Gai factory tacks, the problem of stall, greatly alleviate operations staff's adjusting pressure, and improved the regulation quality that unit cooperative is controlled.
accompanying drawing specification
Fig. 1 is structural representation of the present utility model;
Fig. 2 is logic diagram of the present utility model.
Embodiment
Embodiment, as shown in Figure 1, when the axial flow primary fan of existing thermal power plant paired running moves under automatic control mode, its air quantity regulates and is controlled by wind motor leaf automatic control module, wind motor leaf automatic control module sends aperture instruction to pneumatic leaf opening adjusting device, and pneumatic leaf opening adjusting device regulates movable vane aperture to command value.For avoiding existing controlling method problem, the problem includes: primary air fan tacks, stall problem, on wind motor leaf automatic control module, connect a blower fan current monitoring and comparison device 4, blower fan current monitoring and comparison device 4 by testing current module and size of current to module composition.Blower fan current monitoring is connected with different axial flow primary fans 1 respectively from comparison device 4, and concrete regulate and control method is the electric current that first utilizes blower fan current monitoring and comparison device 4 judgement two Fans, according to electric current [strength, decides the movable vane of which Fans first to adjust.Such as: A, two primary air fan paired runnings of B, now system conditions variation requirement increases primary air fan exerts oneself (needing to increase once pneumatic leaf aperture), and now adjusting is answered automatically: (1) first judges the current deviation of two Fans; (2) preferentially increase the movable vane aperture of the blower fan that electric current is low; (3) continue subsequently relatively two Fans electric currents, increase the movable vane aperture of the blower fan that electric current is low, until meet system requirements.Equally, when system conditions variation requirement minimizing primary air fan is exerted oneself (needing to reduce once pneumatic leaf aperture), adjusting should preferentially reduce the movable vane aperture of the blower fan that electric current is high automatically.
Claims (2)
1. the axial flow primary fan automatic control tegulatingdevice of a paired running, it comprises above axial flow primary fan (1), pneumatic leaf opening adjusting device (2) and the pneumatic leaf control gear of blower fan (3), the pneumatic leaf control gear of blower fan (3) is connected with pneumatic leaf opening adjusting device (2), it is characterized in that: on the pneumatic leaf control gear of blower fan (3), be connected with blower fan current monitoring and comparison device (4), blower fan current monitoring is connected with different axial flow primary fans (1) respectively from comparison device (4).
2. the axial flow primary fan automatic control tegulatingdevice of paired running according to claim 1, is characterized in that: blower fan current monitoring and comparison device (4) by testing current module and size of current to module composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320527330.7U CN203476764U (en) | 2013-08-28 | 2013-08-28 | Parallel-running axial-flow type primary air fan automatic adjusting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320527330.7U CN203476764U (en) | 2013-08-28 | 2013-08-28 | Parallel-running axial-flow type primary air fan automatic adjusting apparatus |
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| CN203476764U true CN203476764U (en) | 2014-03-12 |
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| CN201320527330.7U Expired - Lifetime CN203476764U (en) | 2013-08-28 | 2013-08-28 | Parallel-running axial-flow type primary air fan automatic adjusting apparatus |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423190A (en) * | 2013-08-28 | 2013-12-04 | 贵州电力试验研究院 | Parallel operation axial flow primary fan automatic regulating method and device |
| CN104533818A (en) * | 2014-12-22 | 2015-04-22 | 大唐贵州发耳发电有限公司 | Automatic balance adjusting control system of parallel draught fans |
| CN106861407A (en) * | 2017-02-27 | 2017-06-20 | 上海龙净环保科技工程有限公司 | A kind of blower fan for avoiding paired running tacks the control method of phenomenon |
| CN109340162A (en) * | 2018-11-26 | 2019-02-15 | 贵州金元茶园发电有限责任公司 | It prevents fired power generating unit primary air fan stall from tacking and causes flame-out system and method |
| CN113864224A (en) * | 2021-11-30 | 2021-12-31 | 华电电力科学研究院有限公司 | Double-fan control method, device and equipment and double-fan system |
-
2013
- 2013-08-28 CN CN201320527330.7U patent/CN203476764U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423190A (en) * | 2013-08-28 | 2013-12-04 | 贵州电力试验研究院 | Parallel operation axial flow primary fan automatic regulating method and device |
| CN104533818A (en) * | 2014-12-22 | 2015-04-22 | 大唐贵州发耳发电有限公司 | Automatic balance adjusting control system of parallel draught fans |
| CN106861407A (en) * | 2017-02-27 | 2017-06-20 | 上海龙净环保科技工程有限公司 | A kind of blower fan for avoiding paired running tacks the control method of phenomenon |
| CN109340162A (en) * | 2018-11-26 | 2019-02-15 | 贵州金元茶园发电有限责任公司 | It prevents fired power generating unit primary air fan stall from tacking and causes flame-out system and method |
| CN113864224A (en) * | 2021-11-30 | 2021-12-31 | 华电电力科学研究院有限公司 | Double-fan control method, device and equipment and double-fan system |
| CN113864224B (en) * | 2021-11-30 | 2022-03-01 | 华电电力科学研究院有限公司 | Double-fan control method, device and equipment and double-fan system |
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Granted publication date: 20140312 |
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