CN104197367A - Primary air fan RB optimal control method based on mother tube pressure - Google Patents
Primary air fan RB optimal control method based on mother tube pressure Download PDFInfo
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- CN104197367A CN104197367A CN201410380451.2A CN201410380451A CN104197367A CN 104197367 A CN104197367 A CN 104197367A CN 201410380451 A CN201410380451 A CN 201410380451A CN 104197367 A CN104197367 A CN 104197367A
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Abstract
The invention discloses a primary air fan RB optimal control method based on mother tube pressure. The method comprises the steps of determining relevant data; conducting primary air fan RB pulverized cutting and pulverizer tripping; after a primary air fan RB is triggered when a primary air fan on one side breaks down and trips out, comparing the pulverized layer number N2 which is put into operation before the RB is triggered with the pulverized layer number N needing to be input when the unit rated load is reached; if the N2 is larger than or equal to the N, cutting off two-layer operation pulverized layers from top to bottom with no time intervals, and enabling the corresponding pulverizer to trip out; if the N2 is larger than N1 and smaller than the N, cutting off the topmost operation pulverizer layer immediately, and enabling the corresponding pulverizer to trip out; after pulverized cutting and pulverizer tripping are carried out for T seconds, comparing the pressure measuring value of the primary air mother tube with the pressure of the primary air mother tube pressure of the lowest load stable combustion, and judging the time when the pulverized cutting and pulverizer tripping are stopped. According to the primary air fan RB optimal control method, the operation states of the unit pulverizers and changes of the primary air mother tube pressure are analyzed and judged, the operation number of the pulverizers and tripping time intervals are flexibly adjusted, and the risk that the primary air fan on one side of the unit breaks down is reduced.
Description
Technical field
The present invention relates to a kind of primary air fan RB optimal control method based on main-piping pressure.
Background technology
Along with the development of material technology and improving constantly of energy-conservation requirement, unit capacity is increasing, controlled parameter is more and more, and automatic control is had higher requirement, and must adopt more advanced control strategy can ensure the safe and stable operation of unit under various operating modes.RB (RUNBACK) in thermal power plant refers to when unit major pant item fault trip causes the real power of unit to be restricted, for adaptation equipment is exerted oneself, control system forces unit load to reduce to still the load desired value can bear at operation subsidiary engine, this function runback that is otherwise known as.Perfect RB control strategy is to be based upon on the stable basis of dropping into of coordinated control system, should accomplish to coordinate each subsystem and guarantee the balance transition of operating condition, fast, reposefully load reduction in unit output allowed band.
The RB test of power plant's routine mainly comprises pressure fan RB, air-introduced machine RB, primary air fan RB and feed pump RB etc.Wherein, when primary air fan RB, can cause significant impact to hearth combustion and furnace pressure thereof, its risk maximum.If the successful probability of RB such as pressure fan RB, air-introduced machine RB are more than 80%, the successful probability of primary air fan RB is at most more than 70%.When conventional fired power generating unit generation primary air fan RB carries out fuel control, can be according to the bisque number of plies that dropped at that time burning, carry out bisque excision (powder cut in abbreviation) according to top-down order, until retain the required bisque number of plies of smooth combustion, be generally made as 5-10 second its interval time of cutting powder.Owing to being mutually corresponding between bisque and coal pulverizer, medium-speed pulverizer as direct-firing in malleation is the corresponding one deck powder of a coal pulverizer, the mill that goes with each other all the time is the corresponding two layers of powder of a coal pulverizer, therefore, can be according to the excision of bisque by corresponding coal pulverizer tripping operation (be called for short and jump mill) when cutting powder, reduce the leakage from coal pulverizer of wind, ensure wind main-piping pressure as far as possible one time.
Because fault side primary air fan leaks out, what phenomenon was serious shows as fault side primary air fan appearance reversing; Simultaneously; due to domestic primary air fan, how to have carried out Frequency Conversion Modification energy-conservation to realize; and frequency converter inside is provided with and is unlikely to damage frequency converter while regulating rapid rate value to jump bust with protection instruction; but in the time of RB, the primary air fan instruction of normal operation need increase sharply to make up the air loss that fault blower fan causes.Therefore; in the time there is primary air fan RB; go into sometimes a wind main-piping pressure and can moment significantly reduce the situation that then promotes rapidly; if now still by normal coal pulverizer tripping operation; likely can cause a wind main-piping pressure too low; cannot ensure the normal combustion in burner hearth, final deterioration forms stopping accident.
Summary of the invention
Object of the present invention is exactly for addressing the above problem; a kind of primary air fan RB optimal control method based on main-piping pressure is provided; it analyzes judgement by the variation of the running status to unit coal pulverizer and a wind main-piping pressure; adjust flexibly the operation number of units of coal pulverizer and the time interval of tripping operation; guarantee the band powder ability of a wind; ensure the normal combustion of burner hearth; thereby the reduction unit output of fast and stable while realizing RB, the risk of shutting down while greatly reducing the one-sided primary air fan fault of unit.
For achieving the above object, the present invention adopts following technical scheme:
A primary air fan RB optimal control method based on main-piping pressure, comprises the steps:
Step (1): determine related data: the bisque number of plies N of required input while determining unit rated load; Do not throw oily minimum load and surely fire attribute testing, determine the bisque number of plies N of the required input of the steady combustion of minimum load
1, determine a wind main-piping pressure P who ensures the steady combustion of minimum load; Cut powder and jump the time interval T grinding;
Step (2): primary air fan RB cuts powder and jumps mill: one-sided primary air fan fault trip triggers after primary air fan RB, the bisque number of plies N putting into operation before RB is occurred
2the bisque number of plies N comparison of required input during with unit rated load; If N
2≤ N, enters step (3-1); If N
1< N
2< N, enters step (3-2);
Step (3-1): without the time interval, directly cut away two-layer operation bisque from top to bottom, jump corresponding coal pulverizer, cut powder and jump after mill operation T second, to a wind main-piping pressure measured value P
1compare with a wind main-piping pressure P of the steady combustion of minimum load, if a wind main-piping pressure measured value P
1a wind main-piping pressure P of the steady combustion of < minimum load, and N
2-2 > N
1, again by the time interval T bisque that excision moves successively from top to bottom, until N
2=N
1stop cutting powder and jump mill; An if wind main-piping pressure measured value P
1a wind main-piping pressure P of≤minimum steady combustion load, stops cutting powder and jumps mill;
Step (3-2): cut away immediately last layer operation bisque, jump corresponding coal pulverizer, cut powder and jump after mill operation T second, to a wind main-piping pressure measured value P
1compare with a wind main-piping pressure P of the steady combustion of minimum load, if a wind main-piping pressure measured value P
1< P, and N
2-1 > N
1, again by the time interval T bisque that excision moves successively from top to bottom, until N
2=N
1stop cutting powder and jump mill; An if wind main-piping pressure measured value P
1> P, stops cutting powder and jumps mill.
Be the difference of coal pulverizer type according to boiler, time interval T is 5-10s.
For subsequent use because considering in unit design, when unit rated load, the bisque number of plies N value of required input is that the maximum bisque number of plies of unit subtracts 1.
The method is applicable to two platform primary air fan paired runnings, and the fired power generating unit of wind of employing with powder.
The invention has the beneficial effects as follows:
(1) the present invention analyzes judgement by the variation of the running status to unit coal pulverizer and a wind main-piping pressure, adjust flexibly bisque and the operation quantity of coal pulverizer and the time interval of tripping operation, effectively guarantee wind main-piping pressure one time, and then guaranteed the band powder ability of a wind, ensure the normal combustion of burner hearth;
(2) powder of cutting quick, accurate, stable when the present invention can realize primary air fan RB is jumped mill, ensures the steady decline of unit output, greatly reduces the risk of shutting down when one-sided primary air fan fault occurs unit;
(3) the present invention effectively ensures the bisque and the coal pulverizer quantity that put into operation according to the size of a wind main-piping pressure, reduce unnecessary load decline loss, in ensureing unit safety, reduce the impact to electrical network, guarantee the stability of mains frequency, and then guaranteed safe, the effectively operation of users' electrical equipment and power equipment.
Brief description of the drawings
Fig. 1 is that primary air fan RB cuts powder jumping mill optimal control flow chart;
Fig. 2 is curve map before primary air fan RB optimizes;
Fig. 3 is curve map after primary air fan RB optimizes.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Specifically, taking certain 300MW level unit as example, be equipped with 3 mills that go with each other all the time, every mill has two flour extraction pipes, the two-layer bisque of corresponding boiler, i.e. and A mill corresponding A 1, A2, B grinds corresponding B1, B2, and C grinds corresponding C1, C2, amounts to 6 layers of powder.When normal operation, general 5 layers of powder can bring to 300MW, leave half platform mill, one deck powder is for subsequent use.The bisque number of plies that minimum steady is fired required input is 2 layers, ensures that a wind main-piping pressure of minimum steady combustion is 6.5KPa; The time interval of cutting powder, jumping mill is set as 5s.It is that 210MW is above and one-sided primary air fan fault trip occurs that this unit is defined in 70% rated load, triggers primary air fan RB.
Primary air fan RB when test, power of the assembling unit 270MW, wind main-piping pressure setting value and measured value are 10KPa, the operation of A, B mill complete wear, C mill half mill moves, and the bisque number of plies that correspondence puts into operation is 5 layers, is followed successively by C1, B2, B1, A2, A1 from top to bottom.Manually simulated failure tripping operation B primary air fan, A primary air fan keeps normal operation.
RB is the operation of 5 layers of powder before occurring, because of 5=5, therefore without the time interval, directly cut away the two-layer operation bisque of C1, B2 from top to bottom, retain B1, A2, A1 totally 3 layers of powder operation; After the complete 5s of above-mentioned operation, one time wind main-piping pressure measured value is reduced to 7.1KPa, because of wind main-piping pressure measured value 7.1 > 6.5, jumps mill therefore no longer continue to cut powder.After 3 minutes, the every leading indicator of unit is basicly stable, manually stops RB, and now the power of the assembling unit is 227MW.
Before scheme optimization, under operating mode of the same race, there is RB, cut successively according to 5s interval, primary air pressure main-piping pressure occurring and reduce to 6.4KPa, is 6.5KPa lower than a wind main-piping pressure that ensures minimum steady combustion, and 3 layers of powder of excision, retain 2 layers of powder operation, the power of the assembling unit is reduced to 192MW.
From Fig. 2 and Fig. 3, can it is evident that, the fall of optimizing a rear wind main-piping pressure obviously reduces.Therefore, this programme not only can effectively be guaranteed one time wind main-piping pressure, guarantees the band powder ability of a wind, ensures the normal combustion of burner hearth; Can reduce the excision number of plies of unnecessary bisque, reduce the amplitude that load declines, reduced the load impact that electrical network is caused simultaneously.Wherein, 1-wind main-piping pressure is set; 2-wind main-piping pressure measured value; 3-A primary air fan opening value; 4-B primary air fan opening value.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection scope of the present invention.
Claims (3)
1. the primary air fan RB optimal control method based on main-piping pressure, is characterized in that, comprises the steps:
Step (1): determine related data: the bisque number of plies N of required input while determining unit rated load; Carry out minimum load and surely fire attribute testing, determine the bisque number of plies N of the required input of the steady combustion of minimum load
1, determine a wind main-piping pressure P who ensures the steady combustion of minimum load; Cut powder and jump the time interval T grinding;
Step (2): primary air fan RB cuts powder and jumps mill: one-sided primary air fan fault trip triggers after primary air fan RB, the bisque number of plies N putting into operation before RB is occurred
2the bisque number of plies N comparison of required input during with unit rated load; If N
2≤ N, enters step (3-1); If N
1< N
2< N, enters step (3-2);
Step (3-1): without the time interval, directly cut away two-layer operation bisque from top to bottom, jump corresponding coal pulverizer, cut powder and jump after mill operation T second, to a wind main-piping pressure measured value P
1compare with a wind main-piping pressure P of the steady combustion of minimum load, if a wind main-piping pressure measured value P
1a wind main-piping pressure P of the steady combustion of < minimum load, and N
2-2 > N
1, again by the time interval T bisque that excision moves successively from top to bottom, until N
2=N
1stop cutting powder and jump mill; An if wind main-piping pressure measured value P
1a wind main-piping pressure P of the steady combustion of≤minimum load, stops cutting powder and jumps mill;
Step (3-2): cut away immediately last layer operation bisque, jump corresponding coal pulverizer, cut powder and jump after mill operation T second, to a wind main-piping pressure measured value P
1compare with a wind main-piping pressure P of the steady combustion of minimum load, if a wind main-piping pressure measured value P
1< P, and N
2-1 > N
1, again by the time interval T bisque that excision moves successively from top to bottom, until N
2=N
1stop cutting powder and jump mill; An if wind main-piping pressure measured value P
1> P, stops cutting powder and jumps mill.
2. a kind of primary air fan RB optimal control method based on main-piping pressure as claimed in claim 1, is characterized in that, time interval T is 5-10s.
3. a kind of primary air fan RB optimal control method based on main-piping pressure as claimed in claim 1, is characterized in that, when unit rated load, the bisque number of plies N value of required input subtracts 1 for the maximum bisque number of plies of unit.
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| CN106247393A (en) * | 2016-08-01 | 2016-12-21 | 国网河北省电力公司电力科学研究院 | A kind of machine supplying powder is overcome to break the generator group coordination control strategy of powder |
| CN106801887A (en) * | 2017-02-16 | 2017-06-06 | 华电电力科学研究院 | A kind of anti-interference energy-saving fired power generating unit powder control system |
| CN107238102A (en) * | 2017-05-31 | 2017-10-10 | 上海明华电力技术工程有限公司 | A kind of primary air fan RB control methods under full load mode |
| CN108644804A (en) * | 2018-03-30 | 2018-10-12 | 大唐阳城发电有限责任公司 | It is a kind of for the First air low-voltage variation system of pulverized-coal fired boiler and guard method |
| CN110793056A (en) * | 2019-11-06 | 2020-02-14 | 华北电力科学研究院有限责任公司 | Fault load reduction control system and method for primary fan auxiliary machine of power station boiler |
| CN114074020A (en) * | 2020-08-21 | 2022-02-22 | 北京国电智深控制技术有限公司 | Control method, device and system for coal mill in thermal power generation system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106247393A (en) * | 2016-08-01 | 2016-12-21 | 国网河北省电力公司电力科学研究院 | A kind of machine supplying powder is overcome to break the generator group coordination control strategy of powder |
| CN106801887A (en) * | 2017-02-16 | 2017-06-06 | 华电电力科学研究院 | A kind of anti-interference energy-saving fired power generating unit powder control system |
| CN107238102A (en) * | 2017-05-31 | 2017-10-10 | 上海明华电力技术工程有限公司 | A kind of primary air fan RB control methods under full load mode |
| CN107238102B (en) * | 2017-05-31 | 2019-01-29 | 上海明华电力技术工程有限公司 | A kind of primary air fan RB control method under full load mode |
| CN108644804A (en) * | 2018-03-30 | 2018-10-12 | 大唐阳城发电有限责任公司 | It is a kind of for the First air low-voltage variation system of pulverized-coal fired boiler and guard method |
| CN110793056A (en) * | 2019-11-06 | 2020-02-14 | 华北电力科学研究院有限责任公司 | Fault load reduction control system and method for primary fan auxiliary machine of power station boiler |
| CN110793056B (en) * | 2019-11-06 | 2021-03-30 | 华北电力科学研究院有限责任公司 | Fault load reduction control system and method for primary fan auxiliary machine of power station boiler |
| CN114074020A (en) * | 2020-08-21 | 2022-02-22 | 北京国电智深控制技术有限公司 | Control method, device and system for coal mill in thermal power generation system |
| CN114074020B (en) * | 2020-08-21 | 2024-02-02 | 北京国电智深控制技术有限公司 | Control method, device and system for coal mill in thermal power generation system |
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Inventor after: Li Jun Inventor after: Zhao Yan Inventor before: Li Jun |
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