CN107219809B - The prevention method of primary air fan stall in primary air system - Google Patents
The prevention method of primary air fan stall in primary air system Download PDFInfo
- Publication number
- CN107219809B CN107219809B CN201710009625.8A CN201710009625A CN107219809B CN 107219809 B CN107219809 B CN 107219809B CN 201710009625 A CN201710009625 A CN 201710009625A CN 107219809 B CN107219809 B CN 107219809B
- Authority
- CN
- China
- Prior art keywords
- primary air
- security interval
- air fan
- operating condition
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/048—Monitoring; Safety
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention discloses a kind of prevention method of primary air fan stall in primary air system, primary air system is calculated by real time comprehensive and the security interval of regulating valve, shut-off valve, drag parameter and fan parameter and generates over range alarm one by one.Under present mode of operation and operating condition, each main regulator valve of system, shut-off valve, drag parameter and fan parameter change in security interval, not will cause any Fans stall.If exceeding security interval, it is likely that cause fan stall, generate alarm, operator is reminded to take appropriate measures or carrying out prediction failure in advance.Operator can security interval and parameter by observing regulating valve in primary air system, shut-off valve and fan parameter in real time in the position of security interval, carry out corresponding operation calmly.Corresponding operation can be carried out in time, improves the performance of relevant device by observing the position of the security interval of drag parameter in real time.
Description
Technical field
The present invention relates to aerator supervision technical fields, more particularly to primary air fan stall in a kind of primary air system
Prevention method.
Background technique
Primary air fan is to provide the First air of certain pressure, certain flow, by coal dust drying and is sent into burner, provides
Heat needed for coal dust volatilization and burning.Primary air fan is controlled by motor, impeller, casing, inlet box, collector, pedestal, adjusting
The composition such as system processed.In large capacity thermal power generator, primary air system generallys use the axial-flow type one of two adjusting rotor blades
Secondary fan parallel-connection operation had both been adapted to a wide range of high efficiency adjusted while keeping blower of unit load.
In thermal power generator, First air generally falls into two-way: being sent to coal pulverizer after air preheater heats all the way, rises dry
The effect of dry coal dust；In addition cold First air is sent to coal pulverizer inlet and mixes with heat primary air all the way, to adjust wind powder in coal pulverizer
The temperature of mixture prevents coal dust firing or explosion.
The each coal pulverizer control valve position of pulverized coal preparation system, primary air system operational mode, dust stratification of air preheater etc. all can shadows
Ring the overall drag characteristic in First air air duct.Under identical primary air flow, primary air fan outlet pressure is with First air air duct
Resistance increases and increases, and may cause primary air fan stall, and RB separately occurs (when unit major pant item fault trip is made in unit
When at unit, hair power is restricted in fact (coordinated control system is in auto state), to adapt to equipment power output, coordinated control system
Unit load is reduced to the load target value that still can bear in the subsidiary engine of operation by pressure.The function of coordinated control system is known as
Runback (RUNBACK), abbreviation RB.) when, trip the hot and cold First air quick closing valve baffle of coal pulverizer quick closedown, once
Wind pressure rapid increase, to be easier that stall occurs.Serious fan stall can jeopardize the safe operation of unit, and power plant usually adopts
Stall signal is judged with stall probe and differential pressure switch, and reliability is poor；Stall has the spy of high progression in the process of running
Property, operations staff is difficult to take counter-measure in advance very well.
Summary of the invention
The technical problem to be solved by the present invention is to, a kind of prevention method of primary air fan stall in primary air system is provided,
The prevention method monitors the operating status of blower in real time, makes fan operation in the section of safety, when stall occur in blower
When, staff can be reminded to take appropriate measures in time or carry out accident it is contemplated that avoiding blower in the process of running
High progression.
The technical solution of the invention is as follows, provides primary air fan stall in a kind of primary air system having following structure
Prevention method, comprising the following steps:
Step 1: obtaining and store the critical stall parameter of blower；The critical stall parameter include movable vane aperture O to
Sample, critical stall flow Q vector sample and critical stall pressure P vector sample are measured, respectively to O-Q, O-P, Q-P, Q-O, P-
O, P-Q carry out cubic spline interpolation, obtain cubic spline function fOQ, fOP, fQP, fQO, fPO, fPQ；
Step 2: obtaining primary air system history run mode and history run operating condition sample, and to history run operating condition sample
This progress data cleansing and normalized, then store processing result；
Step 3: selection needs to calculate regulating valve, shut-off valve and the drag parameter of security interval, and configures respective similar
Operating condition subspace element and similarity；
Step 4: obtaining the current control mode of primary air fan；
Step 5: obtaining the operating condition of A primary air fan and B primary air fan, calculate separately A primary air fan and B primary air fan
Security interval；
Step 6: calculating regulating valve, shut-off valve and the drag parameter history security interval and fitting security interval of selection；
Step 7: renormalization calculating being carried out to each section, is converted to practical security interval；
Step 8: showing the calculated result of the security interval of step 5 blower, when real time data exceeds security interval, carry out
Alarm；
Step 9: using the method for first in first out, regularly updating historical data base.
After using the above structure, the prevention method of primary air fan stall in primary air system of the invention, with the prior art
It compares, has the advantage that
The prevention method of primary air fan stall calculates primary air system by real time comprehensive in primary air system of the invention
One by one the security interval of regulating valve, shut-off valve, drag parameter and fan parameter and generate over range alarm.In present mode of operation
Under operating condition, each main regulator valve of system, shut-off valve, drag parameter and fan parameter change in security interval, no
It will cause any Fans stall.If exceeding security interval, it is likely that cause fan stall, generate alarm, remind behaviour
Make personnel and takes appropriate measures or carrying out prediction failure in advance.Operator can be by observing in primary air system in real time
Regulating valve, the security interval of shut-off valve and fan parameter and parameter carry out calmly corresponding operation in the position of security interval.It can
To carry out corresponding operation in time, improve the performance of relevant device by the position for the security interval for observing drag parameter in real time.
As an improvement, obtaining primary air system history run mode and history run operating condition sample in step 2, and to history
Operating condition sample carries out data cleansing and normalized, then stores processing result, the specific method is as follows: step 2.1: adopting
Collection annually wind system operational mode and operating condition sample recently；Step 2.2: if primary air system uses maskantflowmeter
Show, then A primary air fan flow, B primary air fan flow, A coal pulverizer air mass flow, B coal pulverizer air mass flow, C coal pulverizer
Air mass flow, D coal pulverizer air mass flow, E coal pulverizer air mass flow, F coal pulverizer air mass flow are converted into the temperature near flowmeter
Spend the volume flow under pressure；Step 2.3: it is small less than the sample of 10% rated load and primary air fan aperture to reject unit load
In 20% sample；Step 2.4: Z standardized calculation being carried out to each measuring point data of primary air system operating condition, rejecting contains
The sample of measuring point of the standard deviation greater than 3；Step 2.5: meter is normalized to each measuring point data of primary air system operating condition
It calculates；Step 2.6: obtaining effective historical sample set omega, Ω={ (operational mode, operating condition) }.
As an improvement, selection needs to calculate regulating valve, shut-off valve and the drag parameter of security interval in step 3, and configure
The specific method is as follows for respective similar operating condition subspace element and similarity: step 3.1: configuration adjustment valve；Selection needs
It calculates the regulating valve of security interval and is similarly configured operating condition subspace element and similarity；Step 3.1.1: selection needs
Calculate the regulating valve of security interval；Step 3.1.2: the similar operating condition subspace element of each regulating valve is configured；Step
3.1.3: giving the similarity value g1 of each regulating valve；Step 3.2: configuration shut-off valve；Selection needs to calculate the pass of security interval
Disconnected valve is simultaneously similarly configured operating condition subspace element and similarity；Step 3.2.1: selection needs to calculate the shutdown of security interval
Valve；Step 3.2.2: the similar operating condition subspace element of each shut-off valve is configured；Step 3.2.3: each shut-off valve is given
Similarity value g2；Step 3.3: configuration drag parameter；Selection needs to calculate the drag parameter of security interval and is similarly configured operation
Operating condition subspace element and similarity；Step 3.3.1: selection needs to calculate the drag parameter of security interval；Step 3.3.2: match
Set the similar operating condition subspace element of each drag parameter；Step 3.3.3: the similarity value g3 of each drag parameter is given.
In primary air system, in order to realize various unit loads adjustment and operation optimization, often to adjust and each regulating valve and open
Close shut-off valve；In operational process, drag parameter is able to reflect the deterioration parameter and trend of the resistance performance of some parts of appliance；?
During solving stall margin, it is often required that the vector in similar operating condition subspace has certain similitude, similitude
Measuring common Euclidean distance or weighted euclidean distance indicates；When Euclidean distance be less than given value g when, then it is assumed that these samples and
Current working is similar in subspace, can be polymerized to one kind and carry out analysis comparison；Due to selection subspace vector dimension not
To the greatest extent it is identical, the g more than dimension select as far as possible it is larger, it is on the contrary then smaller；In order to the size to different subspace similitude
It can compare and refer to, the similarity of defined parameters removes subspace dimension with similitude to indicate；Due to each regulating valve, pass
The subspace and similarity of disconnected valve and drag parameter are different, therefore not to be defined according to field operator and special work point,
According to model running situation, local directed complete set and sustained improvement can be carried out, model is tended to be perfect.
As an improvement, primary air fan is segmented into following three kinds of control modes in step 4: if 1. stable operation of unit, one
Secondary fan delivery is stable or is set as definite value and throws automatic, the then referred to as constant flow control mode of primary air fan；2. if primary air fan
Outlet pressure is stable or is set as definite value and throws automatic, the then referred to as constant-pressure control mode of primary air fan；3. if primary air fan is dynamic
Leaf regulating valve is in manual mode, then referred to as primary air fan determines control of valve position mode.
As an improvement, obtaining the operating condition of A primary air fan, B primary air fan in step 5, primary air fan is calculated separately
Security interval, the specific method is as follows: step 5.1: if primary air fan is constant flow control mode, obtaining A primary air fan, B respectively
The flow of primary air fan substitutes into function fQP and fQO, and the critical stall pressure and critical stall for acquiring primary air fan respectively are opened
Degree；Step 5.2: if primary air fan is constant-pressure control mode, obtaining the pressure of A primary air fan, B primary air fan respectively, substitute into
In function fPQ and fPO, acquire respectively primary air fan critical stall flow and critical stall aperture；Step 5.3: if First air
Machine is to determine aperture control mode, obtains the aperture of A primary air fan, B primary air fan respectively, is substituted into function fOQ and fOP, respectively
Acquire the critical stall flow and critical stall pressure of primary air fan.This is the critical state ginseng that conventional method seeks blower
Number, can calculate in real time, the last line of defense of stall is avoided as blower, provide operator as reference.
As an improvement, calculated in step 6 regulating valve of selection, shut-off valve and with drag parameter history security interval and fitting
The specific method is as follows for security interval: step 6.1: calculating regulating valve history security interval and fitting security interval；Step
6.1.1: the similar operating condition subspace set according to each regulating valve obtains and calculates current under operating condition subspace
Vector and historical sample vector, and between Euclidean distance D, then remove the dimension of the subspace, obtain each historical sample
Similarity S.Both such as current similar operating condition subspace vector is X, j-th of history subspace vector is Xj, then
Euclidean distance and similarity be respectively Dj and Sj:
Wherein N is the dimension of subspace, and k is the ordinal number of dimension.Step 6.1.2: it obtains and present mode of operation phase
Together, the set Set1 of the sample of S < g1；Step 6.1.3: the minimum aperture a and maximum opening b of regulating valve in set Set1 are asked；Step
Rapid 6.1.4: seeking the renormalization value of a, b, obtains the history security interval of the regulating valve；Step 6.1.5: it obtains and current blower
Control mode is identical, operational mode is identical, the set Set2 of the sample of S < g1；Step 6.1.6: according to the control mode of blower,
Digital simulation security interval；1. if control mode is constant flow control, using meter defined in constant flow fitting security interval
Calculation method；2. if control mode constant-pressure control mode, using calculation method defined in constant-pressure fitting security interval；③
If control mode is to determine valve position, calculation method defined in security interval is fitted using aperture is determined；Step 6.2: calculating shutdown
Valve history security interval；Step 6.2.1: method identical with step 6.1.1 is taken；Step 6.2.2: it obtains and current blower control
The set Set3 of identical, S < g2 the sample of operational mode after mode processed is identical, operational mode turns off Vavle switching with hypothesis；Step
6.2.3: if there is no fan stall signal in Set2, then it is assumed that shut-off valve history security interval is [0,1]；If had in Set2
Fan stall signal, then the equipment state safety margin of shut-off valve is 0, i.e., the shut-off valve, which not can be carried out, turns on or off switching
Operation, otherwise can cause fan stall；Step 6.3: calculate drag parameter history security interval and fitting security interval, method with
Step 6.1 is identical.History security interval is exactly under current state in fact, and similar operating condition subspace vector is similar, history
As long as on sample the regulating valve or shut-off valve individually operated valve of range operator that perhaps drag parameter occurred or
Drag parameter is all that can guarantee that blower does not lose within the scope of deteriorating amplitude herein in the case where other conditions are constant
The situation of speed, therefore within this range, operator can freely operate, and provide intuitive Operating Guideline or tolerance for operator
Drag parameter deteriorates section；Fitting security interval deduces regulating valve or shut-off valve or resistance in such a way that data are fitted
Parameter allows the range changed, and blower is just very likely made to generate stall beyond this range；Parameter in fitting security interval is gone through
It was not occurred on history sample, if valve to operate this section or drag parameter deteriorates into the boundary in this section, pole
It is likely to cause fan stall, operator is reminded slowly to operate and pay close attention to caution the deterioration and trend of drag parameter；
Advantage of this is that real-time exhibition valve and drag parameter may cause the boundary of stall, and remind operator operate with caution and
Pay close attention to parameter trend.
As an improvement, in step 8, the data in security interval and the data beyond security interval with different colors come
It shows.This is a kind of method that data are shown, facilitates operator to observe parameter current and falls in which region, stereovision is strong by one
A bit, if data fall in danger zone and alert operators can also be operated and be adjusted with caution by the way of sound-light alarm.
As an improvement, the method for using first in first out in step 9, regularly updating historical data base, the specific method is as follows:
Step 9.1: acquisition operational mode and operating condition sample in real time store sample；Step 9.2: the sample for regularly updating storage arrives
In database；Step 9.3: using the method for first in first out, deleting the sample data more than 3 years；Step 9.4: repeating step 2.
Due to system operation during, performance state be slowly it is continually changing, take newest sample more representative of the property of system
It can state.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of primary air system of the invention.
Specific embodiment
The invention will be further described with attached drawing combined with specific embodiments below.
As shown in Figure 1, the present invention is the prevention method of primary air fan stall in primary air system, one that First air is passed through
Secondary blower, air preheater, coal pulverizer, seal fan, warm-air drier and the pipeline valve of connection, auxiliary device etc. are known as primary air system.
The prevention method of primary air fan stall in primary air system of the present invention, comprising the following steps:
Step 1: obtaining and store the critical stall parameter of the blower obtained by producer's data or field test.It is critical
Stall parameter is multiple (movable vane aperture O, critical stall flow Q, critical stall pressure P) vector samples, respectively to O-Q, O-P,
Q-P, Q-O, P-O, P-Q carry out cubic spline interpolation, obtain cubic spline function fOQ, fOP, fQP, fQO, fPO, fPQ, respectively
For seeking the stall flow determined under aperture, the stall pressure under aperture is determined, the stall pressure under constant flow, the stall under constant flow
Aperture, the stall flow under stall aperture and constant-pressure under constant-pressure, facilitates looking into for the critical stall parameter of A, B primary air fan
It askes.
Step 2: obtaining primary air system history run mode and history run operating condition sample, and to history run operating condition sample
This progress data cleansing and normalized, then store processing result.Data cleansing refers to discovery and corrects in data file
Last one of program of identifiable mistake, including check data consistency, handle invalid value and missing values etc..
Operational mode is the abbreviation of operational mode vector, refers to each blower motor in primary air system, air preheater motor, mill
Coal electromechanics machine, shut-off valve state composition a vector, characterize the equipment and shut-off valve state of primary air system, referred to as run
Pattern vector, abbreviation operational mode, is indicated with mode, mode=(M, V, H).M is the start and stop shape of main equipment in primary air system
State, M=(A primary air fan start and stop, B primary air fan start and stop, A air preheater start and stop, B air preheater start and stop, A Coal pulverizer, B coal-grinding
Machine start and stop, C Coal pulverizer, D Coal pulverizer, E Coal pulverizer, F Coal pulverizer, A seal fan start and stop, B sealing air
Machine start and stop), start and stop are used 0 and 1 indicate respectively；V is the state of shut-off valve in primary air system, V=(blower communicating door, A First air
Machine outlet damper, B primary air fan outlet damper, A First air pusher side cold air damper, B First air pusher side cold air damper, A air preheater
Outlet damper, B air preheater outlet damper), switch is indicated with 0 and 1 respectively；H is the start and stop state of primary air system steam air heater.
Operating condition is the abbreviation of operating condition vector, is referred under present mode of operation, the electric current of all measurements, tune in system
The vector that section valve opening, temperature, pressure, flow, differential pressure are formed according to specified sequence, is indicated with C vector, referred to as operating condition to
Amount, abbreviation operating condition reflect the operating status of entire primary air system.
Primary air system history run mode and history run operating condition sample are obtained, and history run operating condition sample is carried out
Data cleansing and normalized, then store processing result, and the specific method is as follows:
Step 2.1: acquiring nearest 1 year operational mode and operating condition sample, sampling period are usually 10min；1 year
Sample can substantially cover each operating condition of primary air system normal operation, if downtime is longer in unit 1 year
Or the variable parameter operation time is fewer, 1 year sample of acquisition is not enough to cover each operating condition of primary air system, Ke Yishi
When the sample time span for the acquisition that lengthens, the sample of acquisition is enabled sufficiently to represent the newest operating condition of system.
Step 2.2: if primary air system is indicated using mass flow, then A primary air fan flow, B primary air fan stream
Amount, A coal pulverizer air mass flow, B coal pulverizer air mass flow, C coal pulverizer air mass flow, D coal pulverizer air mass flow, E coal pulverizer are empty
Throughput, F coal pulverizer air mass flow are converted into the volume flow under the temperature, pressure near flowmeter；Air flows in pipeline
When, the resistance of unit pipeline can be calculated using the following equation:, Wherein RmFor the resistance of unit pipeline, u
For the mean flow rate in pipeline, ρ is the density of air, and λ is coefficient of frictional resistance, RsFor the hydraulic radius of pipeline；Local resistance
It can be calculated using the following equation:Wherein Z is local resistance, and ξ is coefficient of partial resistance；When resistance of ducting characteristic
When consistent with physical properties of fluids parameter, drag overall is proportional to square of flow velocity, namely is proportional to square of volume flow.Pass through conversion
At volume flow, facilitate subsequent data processing.
Step 2.3: rejecting sample of the unit load less than the sample and primary air fan aperture of 10% rated load less than 20%
This.In engineering practical experience, in the case that wind motor leaf aperture is less than 20%, caused by influence very little of the stall to system, lead to
Corresponding processing that often it goes without doing.
Step 2.4: Z standardized calculation being carried out to each measuring point data of operating condition, rejects the survey containing standard deviation greater than 3
The sample of point；Rejecting in data to be the data of data noise.The each measuring point of operating condition refers to: the system in addition to operational mode
Interior all measuring points, after primary air system is built up, all measuring points just have determined.
Step 2.5: calculating is normalized to each measuring point data of operating condition；Data are placed an identical scale
It is inside compared, facilitates the comparison of similarity below.
Step 2.6: obtaining effective historical sample set omega, Ω={ (operational mode, operating condition) }；
Step 3: selection needs to calculate regulating valve, shut-off valve and the drag parameter of security interval, and configures respective similar
Operating condition subspace element and similarity.
Similar operating condition subspace refers to the subspace of part operating condition variable.Solving stall margin
In the process, it is often required that the vector in similar operating condition subspace has certain similitude.Such as it solves A air preheater differential pressure and loses
When fast nargin, it is desirable that A-F hot wind adjusts door, cold wind adjusts the vector that totally 19 variables of door, flow and First air total amount form
Similar, similarity measurement is often indicated with Euclidean distance.When Euclidean distance is less than given value g, then it is assumed that these samples and current
Operating condition is similar in subspace, can be polymerized to one kind and carry out analysis comparison.
Stall margin is valve position stall margin, the general designation of drag parameter stall margin and equipment state stall margin.Valve position
Stall margin refers to that under current operating condition, operational mode is constant, it is assumed that some regulating valve is continuously adjusted, so that causing any
Platform primary air fan stall, then it is referred to as valve position stall margin that this, which adjusts aperture and the deviation of current aperture,.Drag parameter stall margin
Refer under current operating condition, operational mode is constant, it is assumed that some parameter is continuous worsening, so that causing any primary air fan
Stall, then the deviation of this parameter and parameter is referred to as drag parameter stall margin.Such as air preheater is due to the continuous aggravation of dust stratification, it is poor
Pressure constantly increases, and the resistance of ducting is caused to increase the differential pressure of air preheater when then claiming fan stall so that fan stall and current
The difference of differential pressure is known as air preheater differential pressure stall margin.Equipment state stall margin refers under current operating condition, operational mode
The state of middle individual equipment switches, if causing any primary air fan stall, claims equipment state stall margin.Such as it is empty pre-
Device closes A air preheater and exports shutoff door, causes wherein primary air fan stall, then A air preheater stall margin is 0；For another example close one
Secondary wind communicating door, not will cause fan stall, then the state stall margin of First air communicating door is -1.
Security interval refers under present mode of operation and operating condition, the state parameter H of valve position or parameter or equipment state
In addition the section that positive and negative stall margin is constituted, referred to as security interval, i.e. (H+Low, H+Top), Low is lower stall margin, and Top is
Upper stall margin.
Selection need to calculate the regulating valve of security interval, shut-off valve and and drag parameter, and configure respective similar operation
The specific method is as follows for operating condition subspace element and similarity:
Step 3.1: configuration adjustment valve.Selection needs to calculate the regulating valve of security interval and is similarly configured operating condition sky
Between element and similarity.The main regulating valve of primary air system has: it is primary that the cold First air of each coal pulverizer of A-F adjusts door, heat
Wind adjusts door, steam air heater adjusts door.Since the valve position of regulating valve changes, the drag characteristic of primary air system will affect, thus it is each
Regulating valve will be separately provided.
Step 3.1.1: selection needs to calculate the regulating valve of security interval, usually the cold First air of each coal pulverizer of A-F
Adjust door, heat primary air adjusts door, steam air heater adjusts door.
Step 3.1.2: each similar operating condition subspace element for adjusting door of configuration is typically configured to other coal pulverizers
Control valve opening, flow and air preheater differential pressure.Such as the similar operating condition subspace of the hot wind adjusting door of A coal pulverizer can match
It is set to B-F hot wind and adjusts door, cold wind adjusting door, flow and air preheater differential pressure totally 17 variables.
Step 3.1.3: the similarity value g1 of each regulating valve is given, is usually uniformly set as 0.05.
Step 3.2: configuration shut-off valve.Selection needs to calculate the shut-off valve of security interval and is similarly configured operating condition sky
Between element and similarity.The main shut-off valve of primary air system has: the First air regulating valve sealing air door of each coal pulverizer of A-F,
Coal pulverizer seals air door, feeder seals air door.Since the valve position of shut-off valve changes, the resistance that will affect primary air system is special
Property, therefore each regulating valve will be separately provided.
Step 3.2.1: selection needs to calculate the shut-off valve of security interval, usually the First air tune of each coal pulverizer of A-F
It saves valve sealing air door, coal pulverizer sealing air door, feeder and seals air door.
Step 3.2.2: the similar operating condition subspace element of each shutoff door is configured, other coal pulverizers are typically configured to
Control valve opening, flow and air preheater differential pressure.Such as similar operating condition of the First air regulating valve sealing air door of A coal pulverizer
Space is configurable to totally 17 variables that B-F hot wind adjusts door, cold wind adjusts door, flow and air preheater differential pressure.
Step 3.2.3: the similarity value g2 of each regulating valve is given, is usually uniformly set as 0.05.
Step 3.3: configuration drag parameter.Selection needs to calculate the drag parameter of security interval and is similarly configured operating condition
Subspace element and similarity.The main drag parameter of primary air system has: A air preheater differential pressure, B air preheater differential pressure, A sealing air
Machine filter net differential pressure and B seal fan strainer differential pressure, furnace pressure etc..With the increase of air preheater or seal fan dust stratification, differential pressure
Increase, influences the drag characteristic of primary air system, therefore each drag parameter will be separately provided.
Step 3.3.1: selection needs to calculate the drag parameter of security interval, and usually A air preheater differential pressure, B air preheater are poor
Pressure, A seal fan strainer differential pressure and B seal fan strainer differential pressure, furnace pressure.
Step 3.3.2: the similar operating condition subspace element of each drag parameter is configured, A-F coal pulverizer is typically configured to
Control valve opening, flow, a wind flow.Such as the similar operating condition subspace of A air preheater differential pressure is configurable to A-F
Hot wind adjusts door, cold wind adjusts totally 19 variables of door, flow and First air total amount.
Step 3.3.3: the similarity value g3 of each drag parameter is given, is usually uniformly set as 0.05.
Step 4: obtaining the current control mode of primary air fan.Primary air fan is segmented into following three kinds of control modes: 1.
If stable operation of unit, primary air flow is stable or is set as definite value and throws automatic, the then referred to as constant flow control mode of primary air fan；
2. if primary air fan outlet pressure is stable or is set as definite value and throws automatic, the referred to as constant-pressure control mode of primary air fan；3. if
The movable vane regulating valve of primary air fan is in manual mode, then referred to as primary air fan determines control of valve position mode.
Step 5: obtaining the operating condition of A, B primary air fan, calculate separately the security interval of blower.The specific method is as follows:
Step 5.1: if primary air fan is constant flow control mode, obtaining the flow of A, B primary air fan respectively, substitute into function
FQP and fQO, acquire respectively blower critical stall pressure and critical stall aperture.
Step 5.2: if primary air fan is constant-pressure control mode, obtaining the pressure of A, B primary air fan respectively, substitute into function
FPQ and fPO, acquire respectively blower critical stall flow and critical stall aperture.
Step 5.3: if primary air fan is to determine aperture control mode, obtaining the aperture of A, B primary air fan respectively, substitute into function
FOQ and fOP acquires the critical stall flow and critical stall pressure of blower respectively.
Step 6: calculate the regulating valve of selection, shut-off valve and with drag parameter history security interval and fitting security interval.
History security interval refers under present mode of operation, and the operating condition configured according to valve position or parameter X is to quantum
Space and given similarity obtain sample set to what historical sample subspace vector was clustered, and asking should in set
Maximum value max (X) the minimum value min (X) of parameter obtains section (min (X), max (X)), the history security interval of referred to as X.
It is fitted security interval, constant flow fitting security interval, determines aperture fitting security interval at constant-pressure fitting security interval
It is referred to as fitting security interval, the practical current control mode which is depended on blower using.
Constant flow is fitted security interval and refers under present mode of operation,
1. with the operating condition vector subspace and given similarity that are configured according to valve position or parameter X, to history
What sample subspace vector was clustered obtains sample set；
2. critical stall pressure P is calculated by the fQP function in step 1；
3. blower pressure-X profile in fitting set sample, substitutes into critical stall pressure P and acquires x0, if x0 > x increases,
So claiming the section (inf { X }, x0) is that constant flow is fitted security interval, and inf { X } is the infimum of parameter X；
4., then the section (x0, sub { X }) is that constant flow is fitted security interval, sub { X } is parameter X's if x0 < x increases
Supremum.Constant flow fitting security interval is usually used in the constant situation of unit load.
Constant-pressure is fitted security interval and refers under present mode of operation,
1. according to valve position or parameter X the operating condition vector subspace configured and given similarity, to history
What sample subspace vector was clustered obtains sample set；
2. critical stall flow Q is calculated by the fPQ function in step 1；
3. compressor flow-X profile in fitting set sample, substitutes into critical stall flow Q and acquires x0, if x0 > x increases,
So claiming the section (inf { X }, x0) is that constant flow is fitted security interval, and inf { X } is the infimum of parameter X；
4., then the section (x0, sub { X }) is that constant flow is fitted security interval, sub { X } is parameter X's if x0 < x increases
Supremum.Constant-pressure fitting security interval is usually used in fan outlet pressure and is set as definite value, and blower throws automatic situation.
Determine aperture fitting security interval to refer under present mode of operation,
1. according to valve position or parameter X the operating condition vector subspace configured and given similarity, to history
What sample subspace vector was clustered obtains sample set；
2. critical stall flow Q is calculated by the fOQ function in step 1；
3. compressor flow-X profile in fitting set sample, substitutes into critical stall flow Q and acquires x0, if x0 > x increases,
So claiming the section (inf { X }, x0) is that constant flow is fitted security interval, and inf { X } is the infimum of parameter X；
4., then the section (x0, sub { X }) is that constant flow is fitted security interval, sub { X } is parameter X's if x0 < x increases
Supremum.Constant-pressure fitting security interval is usually used in fan outlet pressure and is set as definite value, and blower throws automatic situation.Determine aperture
It is manual, the constant situation of aperture that fitting security interval, which is usually used in two Fans apertures,.
Calculate the regulating valve of selection, shut-off valve and with drag parameter history security interval and fitting security interval, specific side
Method is as follows:
Step 6.1: calculating regulating valve history security interval and fitting security interval
Step 6.1.1: the similar operating condition subspace set according to each regulating valve obtains and calculates operating condition
Current vector under space and historical sample vector, and between Euclidean distance D, then remove the dimension of the subspace, obtain
The similarity S of each historical sample.Such as current similar operating condition subspace vector is X, j-th of history subspace vector is
Xj, then the Euclidean distance and similarity of the two are respectively Dj and Sj:
Wherein N is the dimension of subspace, and k is the ordinal number of dimension.
Step 6.1.2:, the set Set1 of the sample of S < g1 identical as present mode of operation is obtained；
Step 6.1.3: the minimum aperture a and maximum opening b of regulating valve in set Set1 are asked；
Step 6.1.4: seeking the renormalization value of a, b, obtains the history security interval of the regulating valve.
Step 6.1.5: acquisition is identical as current air-blower control mode, operational mode is identical, the set of the sample of S < g1
Set2；
Step 6.1.6: according to the control mode of blower, digital simulation security interval.1. if control mode is constant flow control
System, then using calculation method defined in constant flow fitting security interval；2. if control mode constant-pressure control mode, uses
Constant-pressure is fitted calculation method defined in security interval；3. using determining, aperture fitting is safe if control mode is to determine valve position
Calculation method defined in section.
Step 6.2: calculating shut-off valve history security interval；
Step 6.2.1: method identical with step 6.1.1 is taken；
Step 6.2.2: obtaining, operational mode identical as current air-blower control mode and assumes the operation after shutdown Vavle switching
The set Set3 of identical, S < g2 the sample of mode；
Step 6.2.3: if not having fan stall signal in Set2, then it is assumed that shut-off valve history security interval is [0,1]；
If there is fan stall signal in Set2, the equipment state safety margin of shut-off valve is 0, i.e. the shut-off valve not can be carried out opening
Or handover operation is closed, it otherwise can cause fan stall.
Step 6.3: calculating drag parameter history security interval and fitting security interval, method is identical as step 6.1.
Step 7: renormalization calculating being carried out to each section, is converted to practical security interval.Each section is
Refer to above-mentioned regulating valve, shut-off valve and with drag parameter history security interval and fitting security interval.
Step 8: data are shown and alarm.History security interval is indicated with green on computers, indicates safety zone；It is quasi-
The difference set closed between security interval and history security interval is indicated with red, is indicated operation with caution, is prevented stall；According to wind
The control mode of machine shows the security interval calculated result of step 5 blower, and 20% section close to stall point is indicated with red,
Other 80% sections are indicated with green；When real time data falls in red section, alarm is generated.
Step 9: using the method for first in first out, regularly updating historical data base.The specific method is as follows:
Step 9.1: acquisition operational mode and operating condition sample, sampling period are usually 10min in real time, store sample；
Step 9.2: regularly updating the sample of storage into database, the usual period is 1 week；
Step 9.3: using the method for first in first out, deleting the sample data more than 3 years；
Step 9.4: repeating step 2.
The related variable of 1 primary air system operational mode of table
Wherein, operational mode vector mode are as follows:
Mode=(M, V, H)=(M1, M2 ..., M12, V0, V1 ..., V6, H1, H2 ..., H6), wherein M=(M1,
M2 ..., M12), indicate primary air system motor running mode vector；V=(V0, V1 ..., V6), indicate primary air system shutdown
Valve operational mode vector；H=(H1, H2 ..., H6), indicate primary air system steam air heater operational mode vector；Operational mode vector
Dimension is N=25.
The related variable of 2 primary air system operating condition of table
Wherein, operating condition vector C are as follows:
C=(P, DP, Q, O)=(P1, P2 ..., P7, DP1, DP2 ..., DP6, Q1, Q2 ..., Q60, O1, O2 ...,
), O63 wherein P=(P1, P2 ..., P7), indicates primary air system partial pressure operating condition vector；DP=(DP1, DP2 ...,
), DP6 primary air system differential pressure operating condition vector is indicated；Q=(Q1, Q2 ..., Q60), indicate the operation of primary air system flow
Operating condition vector；O=(O1, O2 ..., O63), indicate primary air system control valve opening operating condition vector；Operating condition vector
Dimension is N=40.
The critical stall parameter of table 3A, B primary air fan
Claims (8)
1. the prevention method of primary air fan stall in a kind of primary air system, which comprises the following steps:
Step 1: obtaining and store the critical stall parameter of blower；The critical stall parameter includes movable vane aperture O vector sample
This, critical stall flow Q vector sample and critical stall pressure P vector sample, respectively to O-Q, O-P, Q-P, Q-O, P-O, P-Q
Cubic spline interpolation is carried out, cubic spline function fOQ, fOP, fQP, fQO, fPO, fPQ are obtained；
Step 2: obtain primary air system history run mode and history run operating condition sample, and to history run operating condition sample into
Row data cleansing and normalized, then store processing result；
Step 3: selection needs to calculate regulating valve, shut-off valve and the drag parameter of security interval, and configures respective similar operation
Operating condition subspace element and similarity；The drag parameter has: A air preheater differential pressure, B air preheater differential pressure, A seal fan strainer
Differential pressure and B seal fan strainer differential pressure, furnace pressure；
Step 4: obtaining the current control mode of primary air fan；
Step 5: obtaining the A primary air fan of primary air fan and the operating condition of B primary air fan, calculate separately A primary air fan and B mono-
The security interval of secondary blower；
Step 6: calculating regulating valve, shut-off valve and the drag parameter history security interval and fitting security interval of selection；
Step 7: renormalization calculating being carried out to each section, is converted to practical security interval；
Step 8: showing the calculated result of the security interval of step 5 blower, when real time data exceeds security interval, reported
It is alert；
Step 9: using the method for first in first out, regularly updating historical data base.
2. the prevention method of primary air fan stall in primary air system according to claim 1, it is characterised in that: step 2
Middle acquisition primary air system history run mode and history run operating condition sample, and it is clear to carry out data to history run operating condition sample
It washes and normalized, then stores processing result, the specific method is as follows:
Step 2.1: acquiring recently annually wind system operational mode and operating condition sample；
Step 2.2: if primary air system is indicated using mass flow, then A primary air fan flow, B primary air fan flow, A
Coal pulverizer air mass flow, B coal pulverizer air mass flow, C coal pulverizer air mass flow, D coal pulverizer air mass flow, E coal pulverizer air
Flow, F coal pulverizer air mass flow are converted into the volume flow under the temperature, pressure near flowmeter；
Step 2.3: rejecting sample of the unit load less than the sample and primary air fan aperture of 10% rated load less than 20%；
Step 2.4: Z standardized calculation being carried out to each measuring point data of primary air system operating condition, is rejected big containing standard deviation
In the sample of 3 measuring point；
Step 2.5: calculating is normalized to each measuring point data of primary air system operating condition；
Step 2.6: obtaining effective historical sample set omega, Ω={ (operational mode, operating condition) }.
3. the prevention method of primary air fan stall in primary air system according to claim 1, it is characterised in that: step 3
Middle regulating valve, shut-off valve and the drag parameter for selecting to need to calculate security interval, and it is empty to configure respective similar operating condition
Between element and similarity the specific method is as follows:
Step 3.1: configuration adjustment valve；Selection needs to calculate the regulating valve of security interval and is similarly configured operating condition subspace member
Element and similarity；
Step 3.1.1: selection needs to calculate the regulating valve of security interval；
Step 3.1.2: the similar operating condition subspace element of each regulating valve is configured；
Step 3.1.3: the similarity value g1 of each regulating valve is given；
Step 3.2: configuration shut-off valve；Selection needs to calculate the shut-off valve of security interval and is similarly configured operating condition subspace member
Element and similarity；
Step 3.2.1: selection needs to calculate the shut-off valve of security interval；
Step 3.2.2: the similar operating condition subspace element of each shut-off valve is configured；
Step 3.2.3: the similarity value g2 of each shut-off valve is given；
Step 3.3: configuration drag parameter；Selection needs to calculate the drag parameter of security interval and is similarly configured operating condition sky
Between element and similarity；
Step 3.3.1: selection needs to calculate the drag parameter of security interval；
Step 3.3.2: the similar operating condition subspace element of each drag parameter is configured；
Step 3.3.3: the similarity value g3 of each drag parameter is given.
4. the prevention method of primary air fan stall in primary air system according to claim 3, it is characterised in that: step 4
Middle primary air fan is segmented into following three kinds of control modes: if 1. stable operation of unit, primary air fan air quantity is stable or is set as
Definite value throws automatic, the then referred to as constant flow control mode of primary air fan；2. if primary air fan outlet pressure is stable or is set as definite value
Throw automatic, the then referred to as constant-pressure control mode of primary air fan；3. if the movable vane regulating valve of primary air fan is in manual mode,
Referred to as primary air fan determines control of valve position mode.
5. the prevention method of primary air fan stall in primary air system according to claim 4, it is characterised in that: step 5
The middle operating condition for obtaining A primary air fan, B primary air fan, calculates separately the security interval of primary air fan, the specific method is as follows:
Step 5.1: if primary air fan is constant flow control mode, obtaining the flow of A primary air fan, B primary air fan respectively, substitute into
In function fQP and fQO, acquire respectively primary air fan critical stall pressure and critical stall aperture；
Step 5.2: if primary air fan is constant-pressure control mode, obtaining the pressure of A primary air fan, B primary air fan respectively, substitute into
In function fPQ and fPO, acquire respectively primary air fan critical stall flow and critical stall aperture；
Step 5.3: if primary air fan is to determine aperture control mode, obtaining the aperture of A primary air fan, B primary air fan respectively, substitute into
In function fOQ and fOP, the critical stall flow and critical stall pressure of primary air fan are acquired respectively.
6. the prevention method of primary air fan stall in primary air system according to claim 4, it is characterised in that: step 6
The specific method is as follows for the middle regulating valve for calculating selection, shut-off valve and drag parameter history security interval and fitting security interval:
Step 6.1: calculating regulating valve history security interval and fitting security interval；
Step 6.1.1: the similar operating condition subspace set according to each regulating valve obtains and calculates operating condition subspace
Under current vector and historical sample vector, and between Euclidean distance D, then remove the subspace dimension, obtain each
The similarity S of historical sample；If current similar operating condition subspace vector is X, j-th of history subspace vector is Xj, that
The Euclidean distance and similarity of the two are respectively Dj and Sj:
Wherein N is the dimension of subspace, and k is the ordinal number of dimension；
Step 6.1.2:, the set Set1 of the sample of S < g1 identical as present mode of operation is obtained；
Step 6.1.3: the minimum aperture a and maximum opening b of regulating valve in set Set1 are asked；
Step 6.1.4: seeking the renormalization value of a, b, obtains the history security interval of the regulating valve；
Step 6.1.5: acquisition is identical as current air-blower control mode, operational mode is identical, the set Set2 of the sample of S < g1；
Step 6.1.6: according to the control mode of blower, digital simulation security interval；1. if control mode is constant flow control,
Using calculation method defined in constant flow fitting security interval；2. using level pressure if control mode constant-pressure control mode
Power is fitted calculation method defined in security interval；3. being fitted security interval using aperture is determined if control mode is to determine valve position
Defined calculation method；
Step 6.2: calculating shut-off valve history security interval；
Step 6.2.1: method identical with step 6.1.1 is taken；
Step 6.2.2: obtaining, operational mode identical as current air-blower control mode and assumes the operational mode after shutdown Vavle switching
The set Set3 of identical, S < g2 sample；
Step 6.2.3: if not having fan stall signal in Set2, then it is assumed that shut-off valve history security interval is [0,1]；If
Have fan stall signal in Set2, then the equipment state safety margin of shut-off valve be 0, i.e., the shut-off valve not can be carried out opening or
Handover operation is closed, fan stall otherwise can be caused；
Step 6.3: calculating drag parameter history security interval and fitting security interval, method is identical as step 6.1.
7. the prevention method of primary air fan stall in primary air system according to claim 1, it is characterised in that: in step
In 8, the data in security interval and the data beyond security interval are shown with different colors.
8. the prevention method of primary air fan stall in primary air system according to claim 1, it is characterised in that: step 9
The middle method using first in first out, regularly updating historical data base, the specific method is as follows:
Step 9.1: acquisition operational mode and operating condition sample in real time store sample；
Step 9.2: regularly updating the sample of storage into database；
Step 9.3: using the method for first in first out, deleting the sample data more than 3 years；
Step 9.4: repeating step 2.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016110675924 | 2016-11-24 | ||
| CN201611067592 | 2016-11-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107219809A CN107219809A (en) | 2017-09-29 |
| CN107219809B true CN107219809B (en) | 2019-07-23 |
Family
ID=59927661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710009625.8A Active CN107219809B (en) | 2016-11-24 | 2017-01-06 | The prevention method of primary air fan stall in primary air system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107219809B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108386865B (en) * | 2018-02-05 | 2019-09-03 | 长安益阳发电有限公司 | A kind of 300MW coal unit reduces the control device and method of unburned carbon in flue dust |
| 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 |
| 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 |
| CN112657665B (en) * | 2020-12-04 | 2022-02-11 | 浙江浙能技术研究院有限公司 | Control method for preventing and coping with fan stall in RB process |
| CN113205248B (en) * | 2021-04-27 | 2023-03-24 | 西安热工研究院有限公司 | Regulating valve fault early warning system and method based on big data medium parameter diagnosis |
| CN113653607B (en) * | 2021-08-10 | 2022-10-14 | 浙江浙能数字科技有限公司 | Intelligent power station fan stall early warning diagnosis method based on system efficiency model |
| CN114738308B (en) * | 2022-04-28 | 2024-01-23 | 中国华能集团清洁能源技术研究院有限公司 | Fan fault early warning method and system capable of positioning specific equipment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226904A (en) * | 2011-05-25 | 2011-10-26 | 浙江省电力试验研究院 | Soft measurement method for air quantity of primary air of large-scale boiler in power station |
| 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 |
| CN104200032B (en) * | 2014-09-05 | 2017-04-05 | 山东大学 | Based on period horizontal time shafts clustering method in broad sense load modeling |
-
2017
- 2017-01-06 CN CN201710009625.8A patent/CN107219809B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107219809A (en) | 2017-09-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107219809B (en) | The prevention method of primary air fan stall in primary air system | |
| US20130030573A1 (en) | Computer-based method and device for automatically providing control parameters for a plurality of coal mills supplying coal powder to a plant | |
| US9890709B2 (en) | Method and system for gas turbine extraction | |
| CN110346160A (en) | A kind of coal-grinding engine efficiency abnormality detection and diagnostic method based on SVR | |
| CN105289830B (en) | A kind of medium-speed pulverizer start-up and shut-down control method based on coal amount online compensation | |
| DE102014100481A1 (en) | Systems and methods for measuring a flow profile in the flow path of a turbine | |
| EP3472445B1 (en) | Method for controlling fuel distribution in a gas turbine engine with multiple combustion zones | |
| DE112015004014T5 (en) | Control device, system, control method, energy control device, gas turbine and energy control method | |
| CN105934570A (en) | Method for operating a gas turbine at part load | |
| KR101006637B1 (en) | Steam turbine plant | |
| CN107849981A (en) | The control device and method of gas turbine, the control program of gas turbine, gas turbine | |
| CN107764534A (en) | A kind of method for preventing Steam Turbine's Main Vaper Valve total travel movement test oscillation of power | |
| KR20200098705A (en) | A device for determining the valve opening degree of a cooling air adjustment valve, a device for determining a target temperature for a disk cavity, and a device for controlling a disk cavity temperature | |
| DE112015006101T5 (en) | STATUS DETERMINATION DEVICE, OPERATING CONTROL DEVICE, GAS TURBINE AND CONFORMITY PROCEDURE | |
| CN115596696A (en) | Real-time online estimation method for running state of fan based on data mining | |
| CN107906499B (en) | Fired power generating unit intelligence control system | |
| WO2016207165A1 (en) | Method of controlling a compressor system during voltage dips | |
| EP3362675B1 (en) | A method for automatically evaluating on line the efficiency of a kaplan turbine | |
| CN107559909B (en) | Kitchen ventilator and its control method | |
| CN105226709B (en) | The choosing method of generator sequence is cut off in a kind of power grid high-frequency cutting machine allocation plan | |
| Chauhan et al. | Impact of distributed generation in single area load frequency control on system frequency | |
| Blinov et al. | Technical condition estimation of the gas turbine axial compressor | |
| CN115045854A (en) | Parallel fan balance control method based on machine learning | |
| Rudolf et al. | Analysis of long-term gas turbine operation with a model-based data reconciliation technique | |
| CN108279713A (en) | Organic working medium geothermal power generation coordinated control system based on microprocessor and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |