CN103423190A - Parallel operation axial flow primary fan automatic regulating method and device - Google Patents
Parallel operation axial flow primary fan automatic regulating method and device Download PDFInfo
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- CN103423190A CN103423190A CN2013103797603A CN201310379760A CN103423190A CN 103423190 A CN103423190 A CN 103423190A CN 2013103797603 A CN2013103797603 A CN 2013103797603A CN 201310379760 A CN201310379760 A CN 201310379760A CN 103423190 A CN103423190 A CN 103423190A
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Abstract
The invention discloses a parallel operation axial flow primary fan automatic regulating method and an automatic regulating device. According to the method, a fan current monitoring and comparison module is added on a fan pneumatic blade automatic control module, the current of more than two fans is firstly judged during fan air quantity regulation and control, and the air quantity regulation sequence of a fan is determined according to fan current quantity; the preferential increase of the movable blade opening degree of the fan with low current is used as an air quantity increase regulation condition; the preferential decrease of the movable blade opening degree of the fan with high current is used as an air quantity decrease regulation condition. The optimized control strategy is adopted, the headwind and stall problem of the primary fan is effectively avoided, and the automatic regulation quality of an axial flow primary fan is greatly improved, so guarantee is provided for boiler burning stability.
Description
Technical field
The present invention relates to a kind of axial flow primary fan Automatic adjustment method and device of paired running, belong 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 a 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 the unstable operation district, the stall phenomenon will occur, cause blower fan to exert oneself sharply to descend, the system pressure rapid fluctuation, thereby make conveying interrupt or the quantity delivered fluctuation of coal dust, and then have a strong impact on the combustion stability of boiler, even cause 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 also is 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 problem to be solved in the present invention is to provide and a kind ofly avoids that primary air fan tacks, stall occurs, once axial flow primary fan Automatic adjustment method and the device of the paired running of total blast modification stability, to overcome the deficiencies in the prior art.
Technological scheme of the present invention is: the axial flow primary fan of paired running is regulated optimization method automatically, the method is to set up blower fan current monitoring and comparison function module in the pneumatic leaf automatic control module of blower fan, first judge two electric currents with fan to the fan delivery auto-control time, decide the adjusting order of fan delivery according to the blower fan magnitude of current; The adjusting condition that increases air quantity is the preferential movable vane aperture that increases the blower fan that electric current is low; The adjusting condition that reduces air quantity is the preferential movable vane aperture that reduces the blower fan that electric current is high.
The axial flow primary fan automatic control tegulatingdevice of paired running, it comprises the axial flow primary fan more than, 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 the 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 the paired running more than, be connected with the wind motor leaf opening adjusting device on axial flow primary fan, the movable vane aperture (i.e. the air quantity of this blower fan) of wind motor leaf opening adjusting device for regulating blower fan.When system changes to the demand of primary air flow, at 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 the wind motor leaf automatic control module, the wind motor leaf automatic control module sends to the demand of air quantity the instruction that increases or reduce the movable vane aperture according to primary air system to the wind motor leaf opening adjusting device 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 present invention 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 be judged the electric current of two Fans, decides accordingly 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 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, the stall problem, greatly improved the automatic regulation quality of axial flow primary fan, thereby provide guarantee for boiler burning stable; The present invention easily implements, the 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 the unit band at full capacity, the primary air fan that has fundamentally solved the former existence of this factory tacks, the problem of stall, greatly alleviate operations staff's adjusting pressure, and improved the regulation quality that unit cooperative is controlled.
The accompanying drawing specification
Fig. 1 is structural representation of the present invention;
Fig. 2 is logic diagram of the present invention.
Embodiment
Embodiment, as shown in Figure 1, it is to set up blower fan current monitoring and comparison function module in the pneumatic leaf automatic control module of blower fan that a kind of axial flow primary fan of paired running is regulated optimization method automatically, first judge two electric currents with fan to the fan delivery auto-control time, decide the adjusting order of fan delivery according to the blower fan magnitude of current; The adjusting condition that increases air quantity is the preferential movable vane aperture that increases the blower fan that electric current is low; The adjusting condition that reduces air quantity is the preferential movable vane aperture that reduces the blower fan that electric current is high.
When the axial flow primary fan of existing thermal power plant paired running moves under automatic control mode, its air quantity is regulated and is controlled by the wind motor leaf automatic control module, the wind motor leaf automatic control module sends the aperture instruction to pneumatic leaf opening adjusting device, and pneumatic leaf opening adjusting device is regulated the movable vane aperture to command value.For avoiding existing controlling method problem, the problem includes: primary air fan tacks, the stall problem, connect a blower fan current monitoring and comparison device 4 on the wind motor leaf automatic control module, blower fan current monitoring and comparison device 4 by testing current module and size of current to module composition.The 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 (3)
1. the axial flow primary fan of a paired running is regulated optimization method automatically, it is characterized in that: the method is to set up blower fan current monitoring and comparison function module in the pneumatic leaf automatic control module of blower fan, first judge two electric currents with fan to the fan delivery auto-control time, decide the adjusting order of fan delivery according to the blower fan magnitude of current; The adjusting condition that increases air quantity is the preferential movable vane aperture that increases the blower fan that electric current is low; The adjusting condition that reduces air quantity is the preferential movable vane aperture that reduces the blower fan that electric current is high.
2. the axial flow primary fan automatic control tegulatingdevice of a paired running, it comprises axial flow primary fan (1), pneumatic leaf opening adjusting device (2) and the pneumatic leaf control gear of blower fan (3) more than one, the pneumatic leaf control gear of blower fan (3) is connected with pneumatic leaf opening adjusting device (2), it is characterized in that: be connected with blower fan current monitoring and comparison device (4) on the pneumatic leaf control gear of blower fan (3), the blower fan current monitoring is connected with different axial flow primary fans (1) respectively from comparison device (4).
3. 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.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103883551A (en) * | 2014-03-31 | 2014-06-25 | 国家电网公司 | Control method for eliminating surge of axial flow fans |
| CN104848253A (en) * | 2015-05-13 | 2015-08-19 | 国家电网公司 | Method and device for air capacity control of thermal power generating unit applicable to low nitrogen oxide emission and air capacity control system |
| CN105386992A (en) * | 2015-12-08 | 2016-03-09 | 国网山东省电力公司电力科学研究院 | Optimal control system based on draught fan power output dynamic balance and method |
| CN107219809A (en) * | 2016-11-24 | 2017-09-29 | 浙江浙能中煤舟山煤电有限责任公司 | The prevention method of primary air fan stall in primary air system |
| CN109630452A (en) * | 2018-12-26 | 2019-04-16 | 湖南省湘电试验研究院有限公司 | A kind of primary air fan automatic Synchronization method and system for thermal power generation unit |
| CN110630551A (en) * | 2019-09-10 | 2019-12-31 | 中国能源建设集团华中电力试验研究院有限公司 | Automatic paralleling method and system for induced draft fans of thermal generator set |
| CN112283743A (en) * | 2020-10-28 | 2021-01-29 | 中煤大同能源有限责任公司 | Practical fan robbing wind monitoring system |
| CN112665884A (en) * | 2020-12-11 | 2021-04-16 | 华能国际电力股份有限公司海门电厂 | Online maintenance system for parallel operation fans |
| CN114165466A (en) * | 2020-09-11 | 2022-03-11 | 上海申能电力科技有限公司 | Method for recovering stalled one fan in double-row parallel axial flow primary fan |
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| CN101482127A (en) * | 2008-01-08 | 2009-07-15 | 北京博奇电力科技有限公司 | Parallel operation optimizing control method and system of booster fan |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103883551B (en) * | 2014-03-31 | 2016-01-20 | 国家电网公司 | A kind of controlling method eliminating axial-flow blower surge |
| CN103883551A (en) * | 2014-03-31 | 2014-06-25 | 国家电网公司 | Control method for eliminating surge of axial flow fans |
| CN104848253A (en) * | 2015-05-13 | 2015-08-19 | 国家电网公司 | Method and device for air capacity control of thermal power generating unit applicable to low nitrogen oxide emission and air capacity control system |
| CN105386992A (en) * | 2015-12-08 | 2016-03-09 | 国网山东省电力公司电力科学研究院 | Optimal control system based on draught fan power output dynamic balance and method |
| CN107219809A (en) * | 2016-11-24 | 2017-09-29 | 浙江浙能中煤舟山煤电有限责任公司 | The prevention method of primary air fan stall in primary air system |
| CN109630452B (en) * | 2018-12-26 | 2020-05-22 | 湖南省湘电试验研究院有限公司 | Automatic parallel method and system for primary fans of thermal generator set |
| CN109630452A (en) * | 2018-12-26 | 2019-04-16 | 湖南省湘电试验研究院有限公司 | A kind of primary air fan automatic Synchronization method and system for thermal power generation unit |
| CN110630551A (en) * | 2019-09-10 | 2019-12-31 | 中国能源建设集团华中电力试验研究院有限公司 | Automatic paralleling method and system for induced draft fans of thermal generator set |
| CN110630551B (en) * | 2019-09-10 | 2020-07-31 | 中国能源建设集团华中电力试验研究院有限公司 | Automatic paralleling method and system for induced draft fans of thermal generator set |
| CN114165466A (en) * | 2020-09-11 | 2022-03-11 | 上海申能电力科技有限公司 | Method for recovering stalled one fan in double-row parallel axial flow primary fan |
| CN114165466B (en) * | 2020-09-11 | 2024-06-14 | 上海申能电力科技有限公司 | Method for recovering after stall of one fan in double-row parallel axial-flow primary fan |
| CN112283743A (en) * | 2020-10-28 | 2021-01-29 | 中煤大同能源有限责任公司 | Practical fan robbing wind monitoring system |
| CN112665884A (en) * | 2020-12-11 | 2021-04-16 | 华能国际电力股份有限公司海门电厂 | Online maintenance system for parallel operation fans |
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Application publication date: 20131204 |