CN101509499B - Method and system for preventing fan from surging - Google Patents
Method and system for preventing fan from surging Download PDFInfo
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- CN101509499B CN101509499B CN2009100380372A CN200910038037A CN101509499B CN 101509499 B CN101509499 B CN 101509499B CN 2009100380372 A CN2009100380372 A CN 2009100380372A CN 200910038037 A CN200910038037 A CN 200910038037A CN 101509499 B CN101509499 B CN 101509499B
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- 238000012937 correction Methods 0.000 claims description 54
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- 238000005259 measurement Methods 0.000 claims description 7
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- 239000002817 coal dust Substances 0.000 description 1
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Abstract
The invention relates to a method for fan anti-surge, which comprises the following steps: a. a pulse statistical module counts the number of tipping coal grinding mills over time; b. a judgment amendment module outputs the opening correct valve of movable vanes of the fan according to the accounted number of the tipping coal grinding mills and functional relations; c. a regulation control modulereverses the output retention valve of an adjustor in the instant before the tipping of the coal grinding mills; d. the regulation control module superposes the output retention valve of the adjustorand the opening correct valve of movable vanes of the fan, outputs the opening control commands of the fan and controls the opening of the movable vanes of the fan. The method turns down the opening of the movable vanes of the fan only by detecting the number of tipping coal grinding mills in the condition of without adding processing equipment and changing process flow, ensures the working pointof the fan to be outside a surging line and quickly and effectively prevents the surging of the fan, and has high reliability. The invention also discloses a fan anti-surge system.
Description
Technical field
The present invention relates to a kind of method and system of preventing fan from surging, relate in particular to a kind of method and system of boiler primary air fan anti-surge.
Background technique
The boiler primary air fan is mainly used in provides coal pulverizer drying, the required air of pulverized coal conveying, provides coal dust to enter the catch fire air supply at initial stage of burner hearth simultaneously.When causing the coal pulverizer tripping operation when coal pulverizer tripping operation itself or owing to gas fan, induced draught fan, feed water pump, because chain coal pulverizer hot-air damper and the hot blast adjustment doors of closing of coal pulverizer tripping operation, the blower fan duct resistance increases suddenly, produce quick oscillation of flows and pressure oscillation, duct resistance increases suddenly, the system-head curve steepening, the blower fan operation point moves to left, departs from the blower fan operation point, thereby causes the surge of blower fan.
Because the blower fan surge is attended by reverse end thrust and reverse flow usually, and blower fan will recover normal operation again and need the long time of cost, so surge has reduced the life-span of blower fan, and greatly reduces the blower fan working efficiency.
At present, the preventing fan from surging system realizes by increasing manufacturing equipment usually.For example increase pipeline bypass Surge Prevention System, near blower fan is operated in surge line or when following, open blower fan bypass door or anti-surge valve, the blower fan total blast volume is increased, the blower fan operation point moves to right to surge line trouble free service point in addition.The Chinese patent notice of authorization numbers 2547925 in addition, open day is on April 30th, 2003, name is called in " a kind of one-way shaft flow fan that the anti-surge structure is arranged " and discloses increase blower fan guide ring, the air communication that is blocked in the impeller blade tip is crossed the main flow direction that this bypass guide channel flows into the one-way shaft flow fan, the anti-surge installation of the generation of surge when having solved the blower fan small flow.
Owing to realize having the system design complexity under the situation that present preventing fan from surging system all needs to increase new manufacturing equipment or change technological process, realize complexity, shortcomings such as operating cost height.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of mode of execution simply, not need to increase new manufacturing equipment or change technological process, reliability height, preventing fan from surging method that operating cost is low.
The invention provides the preventing fan from surging method, may further comprise the steps:
Number of tipping coal grinding mills in a, pulse statistical module counts a period of time;
B, judgment amendment module are according to the coal pulverizer tripping operation platform number of adding up, by function relation output wind motor leaf aperture correction value;
C, adjusting control module are returned coal pulverizer tripping operation regulator of preceding moment output retention value;
D, adjusting control module stack regulator output retention value and wind motor leaf aperture correction value, output blower fan aperture control command value, control wind motor leaf aperture.
Preferably, above-mentioned steps a specifically comprises the pulse number by counters count coal pulverizer tripping operation in a period of time.
Preferably, comprise before the above-mentioned steps b judgment amendment module judge coal pulverizer trip the platform number whether greater than 0 and the platform number that moves simultaneously of system's inner blower whether eligible: if, execution in step b; If not, execution in step d.
Preferably, comprise that also judgment amendment module judges whether to meet tracking condition before the above-mentioned steps d: if, regulator output tracking input value; If not, regulator is regulated and the output retention value according to the deviate of wind pressure measurement value and blast setting value.
Above-mentioned tracking condition is to judge according to coal pulverizer tripping operation platform number, system's inner blower operation platform number and other tracking conditions, when coal pulverizer tripping operation platform number greater than zero and intrasystem fan operation platform number is eligible or other tracking conditions meet tracking condition when setting up; Otherwise, do not meet tracking condition.
Preferably, above-mentioned steps d comprises that also aperture distributes control module according to blower fan aperture control command value and each wind motor leaf aperture bias, exports the motor-driven leaf aperture of every typhoon control command, control wind turbine movable vane aperture.
The present invention also provides a kind of system of preventing fan from surging, comprising:
The pulse statistical module, the number of tipping coal grinding mills when blower fan that is used for adding up system in a period of time moves simultaneously;
Judgment amendment module: be used to judge whether correction conditions and loop tracking condition are set up, and when correction conditions is set up, export wind motor leaf aperture correction value by function relation according to the number of tipping coal grinding mills of statistics;
Regulate control module: be used for when the loop tracking condition is set up, return the preceding flashy regulator output retention value of coal pulverizer tripping operation; And stack wind motor leaf aperture correction value and regulator output retention value, output blower fan aperture control command value, control wind motor leaf aperture.
Preferably, above-mentioned pulse statistical module comprises the pulse module sum counter, and each coal pulverizer trip signal is delivered to counter respectively behind described pulse module, the number of tipping coal grinding mills when blower fan in this counters count a period of time in the system moves simultaneously.
Preferably, above-mentioned judgment amendment module comprises judge module and correction value computing module;
Described judge module judges according to the platform number of coal pulverizer tripping operation platform number, fan operation whether correction conditions is set up; And judge in conjunction with other tracking conditions whether the loop tracking condition is set up;
When correction conditions was set up, described correction value computing module was exported wind motor leaf aperture correction value according to the number of tipping coal grinding mills of statistics by function relation.
Preferably, above-mentioned adjusting control module also comprises regulator, is used for when the loop tracking condition is set up the output tracking input value; When the loop tracking condition is false,, the blower fan output quantity is regulated according to the deviate of blower fan outputting measurement value and fan pressure setting value.
Preferably, the system of above-mentioned preventing fan from surging also comprises aperture distribution control module, is used for exporting the aperture control command value of each blower fan according to blower fan aperture control command value and each blower fan aperture bias, controls each wind motor leaf aperture.
The present invention compares with prior art and has the following advantages: the fast control method of preventing fan from surging and system, do not increasing manufacturing equipment and do not changing under the situation of technological process, only by detecting number of tipping coal grinding mills, turn the wind motor leaf aperture down, the operation point that guarantees blower fan is beyond surge line, can fast and effeciently prevent the surge of blower fan, thereby increase work efficiency, and the system architecture of preventing fan from surging is simple, reliability is high, operating cost is low.
Description of drawings
Fig. 1 is the flow chart of the method for a kind of preventing fan from surging of providing of the embodiment of the invention one;
Fig. 2 is the flow chart of the method for a kind of preventing fan from surging of providing of the embodiment of the invention two;
Fig. 3 is the schematic representation of a kind of preventing fan from surging system that provides of the embodiment of the invention;
Fig. 4 is the circuit theory diagrams of a kind of preventing fan from surging system that provides of the embodiment of the invention.
Embodiment
For making the present invention easier to understand, the present invention is further elaborated below in conjunction with accompanying drawing, but the embodiment in the accompanying drawing does not constitute any limitation of the invention.
As shown in Figure 1, the embodiment of the invention one provides a kind of preventing fan from surging method, comprises the steps:
101, number of tipping coal grinding mills in pulse statistical module counts a period of time;
102, judgment amendment module is according to the coal pulverizer tripping operation platform number of statistics, by function relation output wind motor leaf aperture correction value;
103, regulate control module and return coal pulverizer tripping operation regulator of preceding moment output retention value;
104, regulate control module stack regulator output retention value and wind motor leaf aperture correction value, output blower fan aperture control command value, control wind motor leaf aperture.
Said method is by detecting number of tipping coal grinding mills, correction function relation according to system's setting calculates wind motor leaf aperture correction value, turn each wind motor leaf aperture down, the operation point that guarantees blower fan is beyond surge line, blower fan is stably worked, thereby fast and effeciently prevented the surge of blower fan.In addition, regulate the movable vane opening value that coal pulverizer tripping operation blower fan of preceding moment was returned and exported to control module, guarantee that the wind motor leaf aperture keeps the preceding movable vane aperture of tripping operation after coal pulverizer tripping operation pulse occurs, make it not be subjected to the influence of coal pulverizer tripping operation.
As shown in Figure 2, the embodiment of the invention two provides a kind of preventing fan from surging method, comprises the steps:
201, number of tipping coal grinding mills in pulse statistical module counts a period of time.
202, judgment amendment module judge coal pulverizer tripping operation platform number whether greater than 0 and the platform number that moves simultaneously of system's inner blower whether eligible: if, execution in step (203); If not, execution in step (206).
Whether the platform number of this step fan operation eligible can the setting according to actual needs, for example: two typhoon machines are arranged, and two typhoon machines surge occurs when moving simultaneously easily, can be provided with when two typhoon machines move simultaneously eligible in system.
203, judgment amendment module is according to the coal pulverizer tripping operation platform number of statistics, by function relation output wind motor leaf aperture correction value.
When coal pulverizer tripped, duct resistance increased suddenly, the system-head curve steepening, surge appears in blower fan easily, so this step is calculated blower fan aperture correction value according to the system design function relation, turns the wind motor leaf aperture down, the operation point that makes blower fan guarantees the blower fan stable operation in the stall line bottom.
204, aperture keeps module output coal pulverizer tripping operation regulator of preceding moment output retention value.
This step guarantees that the wind motor leaf aperture keeps the movable vane aperture before the tripping operation, is not subjected to the influence of coal pulverizer tripping operation after coal pulverizer tripping operation pulse occurs.
205, regulator output tracking input value; Execution in step (209).
When coal pulverizer tripping operation and fan operation platform number satisfies condition or other tracking conditions when setting up, regulator output tracking input value, after preventing that wind motor leaf override action (promptly keep or turn down wind motor leaf operation) from finishing, the blower fan control command is put back into the value before the override action.Promptly when tracking condition invalid moment, the output value of regulator output can not produce sudden change, keeps the stable of system.
206, whether other tracking conditions are set up: if, execution in step (205); If not, execution in step (207);
The tracking condition that can other be set according to system's needs is manual tune or the like.
207, regulator is regulated the wind motor leaf aperture according to the deviate of wind pressure measurement value and fan pressure setting value;
Regulator is automatically adjusted its output according to default value, makes the fan pressure measured value remain in the environs of setting value.
208, aperture keeps the retention value that module receives and output controller is exported;
209, aperture laminating module stack aperture keeps module output value and wind motor leaf aperture correction value, output blower fan aperture control command value, control wind motor leaf aperture;
When coal pulverizer tripping operation and fan operation platform number satisfy condition, aperture laminating module stack regulator output retention value and wind motor leaf aperture correction value; Otherwise wind motor leaf aperture correction value is a default value 0, and aperture laminating module output controller is regulated the output value after the wind motor leaf aperture.
210, aperture distributes control module according to blower fan aperture control command value and each wind motor leaf aperture bias, exports the motor-driven leaf aperture of every typhoon control command, control wind turbine movable vane aperture.
Each wind motor leaf aperture command value is set to have certain bias in can system, the movable vane aperture that aperture distributes control module to distribute each blower fan according to wind motor leaf aperture bias.
As shown in Figure 3, the invention provides a kind of preventing fan from surging system, comprise pulse statistical module 310, judgment amendment module 320, regulate control module 330 and aperture is distributed control module 340.
The number of tipping coal grinding mills when blower fan that pulse statistical module 310 is used for adding up system in a period of time moves simultaneously.
Regulate control module 330 and be used for when the loop tracking condition is set up, return regulator output retention value; And stack wind motor leaf aperture correction value and regulator output retention value, output blower fan aperture control command value, control wind motor leaf aperture;
Aperture distributes control module 340 to be used for exporting the aperture control command value of each blower fan according to blower fan aperture control command value and each blower fan aperture bias, controls each wind motor leaf aperture.
Wherein, pulse statistical module 310 comprises pulse module 311 sum counters 312, it is counter 312 that each coal pulverizer trip signal is delivered to behind described pulse module respectively, and this counter 312 is added up number of tipping coal grinding mills when the blower fan in the system moves simultaneously in a period of times.
Preferably, judgment amendment module 320 comprises judge module 321 and correction value computing module 322;
Judge module 321 judges according to the platform number of coal pulverizer tripping operation platform number, fan operation whether correction conditions is set up; And judge in conjunction with other tracking conditions whether the loop tracking condition is set up;
When correction conditions was set up, correction value computing module 322 was exported wind motor leaf aperture correction value according to the number of tipping coal grinding mills of statistics by function relation.Correction value computing module 322 comprises the correction function generator 328 and first switch 329.
Preferably, regulate control module 330 and comprise that regulator 332, aperture keep module 333, aperture laminating module 337 and deviation computing module 331.
Aperture keeps module 333 to be used for when the loop tracking condition is set up, and returns preceding flashy regulator 332 output values of coal pulverizer tripping operation; Otherwise, the regulator output value after output controller 332 is regulated.As shown in Figure 4, it can be second switch 333 that aperture keeps module 333, when the loop tracking condition is set up, returns preceding flashy regulator 332 output values of coal pulverizer tripping operation.
As shown in Figure 4, pulse statistical module 310 comprises pulse module 311 sum counters 312, it is counter 312 that each coal pulverizer trip signal is delivered to behind described pulse module respectively, and this counter 312 is added up number of tipping coal grinding mills when the blower fan in the system moves simultaneously in a period of times.
Regulate control module 330 and comprise subtractor 331, regulator 332, adder 337 and second switch 333.Two input ends of regulator 332 link to each other with blower fan measurement signal 334 with subtractor 331 output terminals respectively, and subtractor 331 input ends link to each other with fan pressure duty setting signal 335 with blower fan measurement signal 334.The condition entry end of second switch 333 links to each other with the output terminal with door 324, and the input end of second switch 333 links to each other with regulator 332.When being output as 1 or other tracking condition signals 327 when being 1 with door 324, regulator 332 is carried out the measurement of situations such as fan operation air quantity or blast and is followed the tracks of, after preventing that wind motor leaf override action (promptly keep or turn down wind motor leaf operation) from finishing, the blower fan control command is put back into the value before the override action, i.e. moment when tracking condition is false, the regulator output value can not produce sudden change, keeps the stable of system.When the condition entry end of regulator 332 was input as 0, regulator 332 was exported blower fan according to the deviate of setting and is regulated, and makes the output of blower fan keep stable.Adder 337 be used to superpose wind motor leaf aperture correction value and regulator output value, output blower fan aperture control command value, control wind motor leaf aperture.Adder 337 input ends link to each other with the output terminal of first switch 329 and second switch 333 respectively, and in addition, the input end of adder 337 links to each other with the feedback end of second switch 333.When the condition entry end of second switch 333 is set up, adder 337 wind motor leaf aperture signal feed back are given second switch 333, and then by the output terminal of second switch 333 with the signal of feedback by being transferred to adder 337, thereby when realizing that correction conditions is set up, the movable vane opening value of adder 337 output coal pulverizer tripping operation blower fans of preceding moment.When the condition entry end of second switch 333 is false, the fan delivery regulated signal of regulator 332 outputs is passed to adder 337 by second switch 333.Adder 337 is transferred to aperture with signal and distributes control module 340, thereby realizes the control of each wind motor leaf aperture.
Aperture distributes control module 340 to comprise each wind motor leaf aperture biasing module 341.Aperture distributes control module 340 input ends to link to each other with the output terminal of adder 337.Each wind motor leaf aperture biasing arrangement 341 is used for exporting the aperture control command value of each blower fan, thereby controlling each wind motor leaf aperture according to blower fan aperture control command value and each blower fan aperture bias.
Preventing fan from surging of the present invention system, simple in structure, reliability is high, can conveniently realize preventing fan from surging control, increase the efficient of system and strengthened the stability of system; And do not need to increase new technology and equipment, operating cost is low.
The above is a preferred implementation of the present invention; certainly can not limit the present invention's interest field with this; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention; can also make some improvement and change, these improvement and change also are considered as protection scope of the present invention.
Claims (11)
1. the method for a preventing fan from surging is characterized in that: may further comprise the steps:
Number of tipping coal grinding mills in a, pulse statistical module counts a period of time;
B, judgment amendment module are according to the coal pulverizer tripping operation platform number of adding up, by function relation output wind motor leaf aperture correction value;
C, adjusting control module are returned coal pulverizer tripping operation regulator of preceding moment output retention value;
D, adjusting control module stack regulator output retention value and wind motor leaf aperture correction value, output blower fan aperture control command value, control wind motor leaf aperture.
2. the method for preventing fan from surging according to claim 1 is characterized in that: described step a specifically comprises the pulse number by counters count coal pulverizer tripping operation in a period of time.
3. the method for preventing fan from surging according to claim 2, it is characterized in that: comprise before the described step b judgment amendment module judge coal pulverizer trip the platform number whether greater than 0 and the platform number that moves simultaneously of system's inner blower whether meet correction conditions: if, execution in step b; If not, execution in step d.
4. the method for preventing fan from surging according to claim 3 is characterized in that: comprise that also judgment amendment module judges whether to meet tracking condition before the described steps d: if, regulator output tracking input value; If not, regulator is regulated and the output retention value according to the deviate of wind pressure measurement value and blast setting value.
5. the method for preventing fan from surging according to claim 4, it is characterized in that: described tracking condition is to judge according to coal pulverizer tripping operation platform number, system's inner blower operation platform number and other tracking conditions, when coal pulverizer tripping operation platform number greater than zero and intrasystem fan operation platform number is eligible or other tracking conditions meet tracking condition when setting up; Otherwise, do not meet tracking condition.
6. the method for preventing fan from surging according to claim 5, it is characterized in that: described steps d comprises that also aperture distribution control module is according to blower fan aperture control command value and each wind motor leaf aperture bias, export the motor-driven leaf aperture of every typhoon control command, control wind turbine movable vane aperture.
7. the system of a preventing fan from surging is characterized in that: comprise
The pulse statistical module, the number of tipping coal grinding mills when blower fan that is used for adding up system in a period of time moves simultaneously;
Judgment amendment module is used to judge whether correction conditions and loop tracking condition are set up, and when correction conditions is set up, exports wind motor leaf aperture correction value according to the number of tipping coal grinding mills of statistics by function relation, otherwise be output as 0;
Regulate control module, be used for when the loop tracking condition is set up, return the preceding flashy regulator output retention value of coal pulverizer tripping operation; And stack wind motor leaf aperture correction value and regulator output retention value, output blower fan aperture control command value, control wind motor leaf aperture.
8. the system of preventing fan from surging according to claim 7, it is characterized in that: described pulse statistical module comprises the pulse module sum counter, each coal pulverizer trip signal is delivered to described counter respectively behind described pulse module, the number of tipping coal grinding mills when blower fan in described counters count a period of time in the system moves simultaneously.
9. the system of preventing fan from surging according to claim 8, it is characterized in that: described judgment amendment module comprises judge module and correction value computing module;
Described judge module judges according to the platform number of coal pulverizer tripping operation platform number, fan operation whether correction conditions is set up; And judge in conjunction with other tracking conditions whether the loop tracking condition is set up;
When correction conditions was set up, described correction value computing module was exported wind motor leaf aperture correction value according to the number of tipping coal grinding mills of statistics by function relation.
10. the system of preventing fan from surging according to claim 9, it is characterized in that: described adjusting control module also comprises regulator, is used for when the loop tracking condition is set up the output tracking input value; When the loop tracking condition is false,, the blower fan output quantity is regulated according to the deviate of blower fan outputting measurement value and fan pressure setting value.
11. the system of preventing fan from surging according to claim 10, it is characterized in that: the system of described preventing fan from surging also comprises aperture distribution control module, be used for according to blower fan aperture control command value and each blower fan aperture bias, export the aperture control command value of each blower fan, control each wind motor leaf aperture.
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| CN102606464B (en) * | 2011-12-15 | 2014-12-10 | 西安兴仪启动发电试运有限公司 | Real-time monitoring and preventing method for surge and stall of axial flow fan |
| CN111486113B (en) * | 2020-03-18 | 2021-03-26 | 北京化工大学 | Moving blade adjustable axial flow fan surge early warning method and device |
| CN113669294A (en) * | 2021-07-29 | 2021-11-19 | 华能(浙江)能源开发有限公司玉环分公司 | Induced draft fan stall early warning method |
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| CN1405456A (en) * | 2001-09-18 | 2003-03-26 | 株式会社日立制作所 | Multi-compressor control method and compressor system |
| WO2004016951A1 (en) * | 2002-08-12 | 2004-02-26 | Hitachi Industries Co., Ltd. | Turbo compressor and method of operating the turbo compressor |
| JP2007040171A (en) * | 2005-08-03 | 2007-02-15 | Mitsubishi Heavy Ind Ltd | Inlet guide vane control device of gas turbine |
| CN101311554A (en) * | 2007-05-24 | 2008-11-26 | 中国科学院工程热物理研究所 | Three-factor matching method for improving energy efficiency for blade type fluid machinery |
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|---|---|---|---|---|
| CN1405456A (en) * | 2001-09-18 | 2003-03-26 | 株式会社日立制作所 | Multi-compressor control method and compressor system |
| WO2004016951A1 (en) * | 2002-08-12 | 2004-02-26 | Hitachi Industries Co., Ltd. | Turbo compressor and method of operating the turbo compressor |
| CN1650105A (en) * | 2002-08-12 | 2005-08-03 | 日立产业有限公司 | Turbocompressor and its operation method |
| JP2007040171A (en) * | 2005-08-03 | 2007-02-15 | Mitsubishi Heavy Ind Ltd | Inlet guide vane control device of gas turbine |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF GUANGDONG POWER GRID Co.,Ltd. Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF GUANGDONG POWER GRID Corp. |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF GUANGDONG POWER GRID Corp. Address before: 510600 heat treatment room, Guangdong Grid Co Electric Power Research Institute, No. 73 Meihua Road, Guangzhou, Guangdong, Yuexiu District, China Patentee before: Test & Research Institute of Guangdong Electric Power Bureau |
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Effective date of registration: 20170804 Address after: 510630, No. fifth, No. 146-150, Whampoa Avenue, Tianhe District, Guangdong, Guangzhou Patentee after: GUANGDONG DIANKEYUAN ENERGY TECHNOLOGY Co.,Ltd. Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF GUANGDONG POWER GRID Co.,Ltd. |
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Address after: Room 501-503, annex building, Huaye building, No.1-3 Chuimao new street, Xihua Road, Yuexiu District, Guangzhou City, Guangdong Province 510000 Patentee after: China Southern Power Grid Power Technology Co.,Ltd. Address before: 510630 fifth, 146-150 Whampoa Avenue Middle Road, Tianhe District, Guangzhou, Guangdong. Patentee before: GUANGDONG DIANKEYUAN ENERGY TECHNOLOGY Co.,Ltd. |