CN108870437A - A kind of coal-grinding unit primary air pressure control method and control system - Google Patents
A kind of coal-grinding unit primary air pressure control method and control system Download PDFInfo
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- CN108870437A CN108870437A CN201810385591.7A CN201810385591A CN108870437A CN 108870437 A CN108870437 A CN 108870437A CN 201810385591 A CN201810385591 A CN 201810385591A CN 108870437 A CN108870437 A CN 108870437A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/007—Regulating air supply or draught using mechanical means
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Abstract
The invention discloses a kind of coal-grinding unit primary air pressure control method and control systems, for fired power generating unit, the fired power generating unit includes coal-grinding unit and its control system, the primary air pressure setting value of coal-grinding unit is that control system is obtained by carrying out operation to primary air pressure setting value variable, and the primary air pressure setting value variable includes：Functional value of the load instruction after functional operation, coal pulverizer demand total blast volume, biasing, load instruction and the unit load deviation of operator's setting, main vapour pressure setting value and the practical main vapour pressure deviation of unit.The present invention considers influence of each variable for influencing primary air pressure setting value for result comprehensively, and the calculating process of primary wind pressure force value is optimized, primary air pressure setting value is set more accurately to meet the requirement of coal pulverizer, reduce the fluctuation of unit main vapour pressure value, stablize unit operation, and the economy of unit operation is improved, reduce the electricity loss of First air unit.
Description
Technical field
The present invention relates to power industries, specifically, being related to a kind of coal-grinding unit primary air pressure control method and control
System.
Background technique
Energy-saving and emission-reduction are the Vital Strategic Problems of the relationship sustainable development of socio-economy.Power industry is both high-quality cleaning energy
The creator in source, and be primary energy consumption rich and influential family and disposal of pollutants rich and influential family, thus be also the emphasis that country implements energy-saving and emission-reduction
Field.The energy-saving important measure for being in response to national energy conservation and emission reduction and low-carbon economy of thermal power generation unit is enhancing firepower hair
The effective measures of power plant's market competitiveness.
Thermal energy that thermal power generation generates when referring to using fuel combustions such as coals heats water, and water is made to become high temperature, high pressure
Vapor, the general name for then pushing steam turbine generator to generate electricity by vapor again；Thermal power generation unit mainly includes boiler, steamer
The equipment such as machine, generator, coal pulverizer, primary air fan and DCS control system；Raw coal is ground into coal dust by coal pulverizer, by First air
Machine provides the First air of certain pressure, certain flow, by coal dust drying and is sent into boiler furnace, coal dust is in furnace chamber inner combustion and incites somebody to action
Water, is heated into the steam of certain temperature and pressure by the heat transfer water supply released, output to steam turbine, and steam turbine is by steam
Energy be converted to mechanical energy, driven generator power generation.Coordinated control refers to two subsystems of boiler implosion and steam turbine control
System is controlled to cooperation as a whole, mutually, so that boiler and steam turbine is adapted to network load jointly as soon as possible and is become
The needs of change, and unit safety, stable operation are kept jointly.
The task of thermal power plant pulverized coal preparation system is exactly that certain amount, quality and the coal for meeting burden requirement are provided for boiler
Powder.Direct-blowing type coal mill pulverized coal preparation system is because coal is adaptable, boiler load fast response time is answered extensively due to the advantages that
With.The coordinated control of double inlet and outlet coal mill pulverized coal preparation system unit usually adjusts door control by coal pulverizer capacity wind and enters
The fuel quantity of burner hearth, the adjusting door restriction loss of capacity wind is big, influences the economy of unit operation.
In the prior art, the primary wind pressure that primary air fan provides is the maximum of quantity and each coal pulverizer according to coal pulverizer
Intake and a fixed value of determination.Each coal pulverizer and primary air fan are both provided with for itself intake and primary wind pressure
Automatic control system, such as：The automatic control system of coal pulverizer realizes intake and its work at present of any moment coal pulverizer
The adjustment of relationship between state, the coal-grinding state for keeping the intake of each coal pulverizer current with it always match.And primary air fan
Automatic control system primary air fan is then adjusted according to pressure-measuring-point required for energy consumption to export stable primary wind pressure.
But in coal pulverizer work, the reasons such as type, coal input quantity of raw coal can all influence the working efficiency of coal pulverizer,
To make the throttle opening value of coal pulverizer also constantly change, the result of this variation leads to pre-set each coal pulverizer demand
Total blast volume also constantly changing, and primary air fan cannot be according to the big of the corresponding adjustment primary wind pressure of variation of coal pulverizer
Small, this may occur：The primary wind pressure of primary air fan output is lower than the total blast volume of current each coal pulverizer demand and leads to coal-grinding
Machine job insecurity；Or primary wind pressure be greater than the required total blast volume of each coal pulverizer, cause primary wind pressure cannot make full use of and
The energy consumption of primary air fan is caused to waste.
Current boiler load adjustment is the load air door for changing coal pulverizer by control system (DCS or outer welding system)
Control instruction influence pulverized coal preparation system ventilation power output, and then influence boiler coal input quantity.Here primary air pressure setting value is
The function of load instruction (LDCOUT), for given value between 8~13KPa, operations staff can be according to currently practical operating condition, to setting
Value is modified, to meet unit needs.Since primary air pressure setting value is adjusted according only to load instruction, that is, root
It is adjusted according to AGC instruction variation, therefore can more quickly adapt to the needs of load variations, but this preset value calculation mode
The operating condition for not considering coal pulverizer causes energy waste, reduces the economy of unit operation.
In view of this present invention is specifically proposed.
Summary of the invention
The technical problem to be solved in the present invention is that overcoming the deficiencies of the prior art and provide a kind of power plant boiler First air
Compress control method and control system consider influence of each variable for influencing primary air pressure setting value for result comprehensively,
And the calculating process of primary wind pressure force value is optimized, so that primary air pressure setting value is more accurately met wanting for coal pulverizer
It asks, reduces the fluctuation of unit main vapour pressure value, stablize unit operation, and improve the economy of unit operation, reduce one
The electricity loss of secondary blower.
A purpose of the invention is that the total blast volume of the primary wind pressure of primary air fan and each coal pulverizer demand is enable to establish in fact
Shi Guanlian.
Two purposes of the invention be to provide the primary wind pressure of primary air fan a kind of with the total blast volume variation of coal pulverizer demand and
The method of synchronous variation.
Three purposes of the invention are to enable the variation of the primary wind pressure random groups load of primary air fan and synchronize variation
Method.
Four purposes of the invention are to enable the variation of the primary wind pressure random groups main vapour pressure of primary air fan and synchronize change
The method of change.
In order to realize the purpose, the present invention adopts the following technical scheme that：
A kind of coal-grinding unit primary air pressure control method is used for fired power generating unit, and the fired power generating unit includes coal-grinding unit
With its control system, the primary air pressure setting value of coal-grinding unit be control system by primary air pressure setting value variable into
Row operation obtains, and the primary air pressure setting value variable includes：Functional value, coal pulverizer of the load instruction after functional operation need
Ask total blast volume, biasing, load instruction and the unit load deviation of operator's setting, main vapour pressure setting value and unit practical main
Steam pressure deviation.
Further, the coal pulverizer demand total blast volume is determined by the quantity of operation coal pulverizer and the intake of each coal pulverizer
It is fixed；The intake of each coal pulverizer is adjusted according to the mixed windshield plate aperture of coal pulverizer；
Preferably, the mixed windshield plate aperture is determined by coal class and/or coal input quantity；
Preferably, the coal pulverizer demand total blast volume accounts for the 1% of primary air pressure setting value.
Further, the load instruction and unit load deviation include：It is calculated using lead-lag LEADLAG module
The difference A of the current value of value and load instruction after one setting time T1 of load instruction and unit load deviation, the LEADLAG mould
Block is LEADLAG1；
Preferably, T1 is 30 seconds.
Further, the difference A becomes institute after another LEADLAG module-LEADLAG2 is filtered
State load instruction and unit load deviation；
Preferably, what LEADLAG2 module carried out is to be filtered for 18 seconds.
Further, the main vapour pressure setting value includes with unit main vapour pressure deviation：Use LEADLAG module meter
Value and unit main vapour pressure after calculating the one setting time T2 of deviation of unit main vapour pressure setting value and the practical main vapour pressure of unit
The difference B of the current value of setting value, the LEADLAG module are LEADLAG3；
Preferably, T2 is greater than T1；
It is further preferred that T2 is 60 seconds.
Further, the difference B becomes institute after another LEADLAG module-LEADLAG4 is filtered
State main vapour pressure setting value and the practical main vapour pressure deviation of unit；
Preferably, what LEADLAG4 module carried out is to be filtered for 12 seconds.
Further, the primary air pressure setting value of the coal-grinding unit is 7~9.5Kpa.
Further, the measurement point of the primary air pressure of the coal-grinding unit of fired power generating unit is arranged in heat primary air main pipe,
Fired power generating unit carries out the adjusting of coal pulverizer primary air pressure according to the primary air pressure that the measurement point detects.
Further, the measurement point is multiple, and during the primary wind pressure force value obtained to each measurement point measurement takes
Operation obtains primary air pressure measured value；
Preferably, measurement point is 3.
A kind of control system of application coal-grinding unit primary air pressure control method as described in any of the above-described, coal-grinding unit
Primary air pressure setting value is obtained by carrying out operation to primary air pressure setting value variable, the primary air pressure setting value
Variable includes：Functional value of the load instruction after functional operation, coal pulverizer demand total blast volume, the biasing of operator's setting, load
Instruction and unit load deviation, main vapour pressure setting value and the practical main vapour pressure deviation of unit.
After adopting the above technical scheme, the present invention has the advantages that compared with prior art.
Of the invention a kind of coal-grinding unit primary air pressure control method and control system, increase the total wind of coal pulverizer demand
Amount, load instruction and unit load deviation, main vapour pressure setting value and the practical main vapour pressure deviation dispatch control system of unit into
The variable of row primary air pressure preset value calculation, and existing variable is optimized.The present invention has fully considered coal pulverizer
Influence of the demand total blast volume for primary air pressure setting value, and aerofoil aperture is mixed by coal pulverizer demand total blast volume and coal pulverizer
Between direct relation, and then using coal pulverizer mix aerofoil aperture as adjustment operation primary air pressure setting value a variable.
It has fully considered that coal class and/or coal input quantity etc. influence the factor of primary air pressure setting value, the operation of the value is enable to add accurately
With it is objective, more meet unit load and coal pulverizer operation actual conditions, make control system more can be according to unit needs, in time
Unit primary air fan guide vane opening is adjusted, to reduce the energy consumption of primary air fan factory.
The present invention is inclined using load instruction and unit load deviation, main vapour pressure setting value and the practical main vapour pressure of unit
Difference, achieve primary air pressure setting value accurately reflect unit dynamic operation condition variation and reduce unit main vapour pressure fluctuate it
Between balance.
By using the instruction of lead-lag LEADLAG module calculated load and unit load deviation, and will be calculated
Load instruction and unit load deviation are as the variable for carrying out primary air pressure preset value calculation.To keep unit negative in plus-minus
During lotus, it can either quickly change primary air pressure setting value, while also negative by the instruction of PID arithmetic calculated load and unit
Lotus deviation reduces fluctuation of the unit main vapour pressure in this dynamic process of load increase and decrease, stablizes unit operation.It is similar
's：Using main vapour pressure setting value and the practical main vapour pressure deviation of unit as the change for influencing primary air pressure preset value calculation
Amount when unit main vapour pressure being made to deviate setting value, quickly changes primary air pressure setting value, while the present invention further passes through
PID arithmetic is carried out to calculate the deviation of unit main vapour pressure setting value and the practical main vapour pressure of unit using LEADLAG module, is subtracted
Unit operation is stablized in few fluctuation of the unit main vapour pressure when deviateing setting value.
In addition to this, the present invention will also further reduce unit primary air pressure setting value, considerably reduce motor use
Electricity is revised as 7~9.5KPa from 8 original~13KPa, and such primary air pressure setting value still may be used in terms of practical application
To meet unit needs.By the adjustment of the numerical value, for 6KV motor, the amount for saving station service is just considerable.
In order to improve the accuracy of primary air pressure set value calculation, the precision of unit allocation is improved, just has to protect
The numerical value for the primary air pressure that card unit is tested is more in line with the actual working condition of system, this is to realize that unit is precisely controlled
Basis.Therefore, the present invention has also carried out displacement transformation to primary air pressure measuring point.Using multiple in heat primary air main pipe
The wind pressure measured value of measurement point carries out that middle operation is taken to obtain primary air pressure measured value, keeps measurement more representative,
The result of measurement is more nearly the practical operation situation of unit.
The present invention considers influence of each variable for influencing primary air pressure setting value for result comprehensively, and to First air
The calculating process of pressure value and the position of primary air pressure measuring point optimize, and keep primary air pressure setting value fuller
The requirement of sufficient coal pulverizer reduces the fluctuation of unit main vapour pressure value, stablizes unit operation, and improve the economy of unit operation
Property, reduce the electricity loss of First air unit.The rapidity, stability, accuracy of unit allocation is set to be greatly improved.
A specific embodiment of the invention is described in further detail with reference to the accompanying drawing.
Detailed description of the invention
Attached drawing is as a part of the invention, and for providing further understanding of the invention, of the invention is schematic
Examples and descriptions thereof are used to explain the present invention, but does not constitute an undue limitation on the present invention.Obviously, the accompanying drawings in the following description
Only some embodiments to those skilled in the art without creative efforts, can be with
Other accompanying drawings can also be obtained according to these attached drawings.In the accompanying drawings：
Fig. 1 is primary air pressure setting in of the invention a kind of coal-grinding unit primary air pressure control method and control system
It is worth arithmetic logic figure；
Fig. 2 is of the invention a kind of coal-grinding unit primary air pressure control method and control system to measurement point position
Transformation schematic diagram.
In figure：1, the biasing of operator's setting；2, the function of unit load instruction；3, coal pulverizer demand total blast volume；4,
lEADLAG1；5,lEADLAG2；6,lEADLAG3；7,lEADLAG4；8, the measurement point of improved primary air pressure；9, it is transformed
The measurement point of preceding primary air pressure.
It should be noted that these attached drawings and verbal description are not intended to the design model limiting the invention in any way
It encloses, but illustrates idea of the invention by referring to specific embodiments for those skilled in the art.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in embodiment is clearly and completely described, the following examples are intended to illustrate the invention, but
It is not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that term " on ", "front", "rear", "left", "right", " is erected at "lower"
Directly ", the orientation or positional relationship of the instructions such as "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, merely to just
In description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with
Specific orientation construction and operation, therefore be not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, it can also be indirectly connected through an intermediary.For this
For the those of ordinary skill in field, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As shown in Figure 1 to Figure 2, the invention discloses a kind of coal-grinding unit primary air pressure control method and control system,
For fired power generating unit, the fired power generating unit includes coal-grinding unit and its control system, the primary air pressure setting value of coal-grinding unit
It is that control system is obtained by carrying out operation to primary air pressure setting value variable, the primary air pressure setting value variable packet
It includes：Functional value of the load instruction after functional operation, coal pulverizer demand total blast volume, the biasing of operator's setting, load instruction and
Unit load deviation, main vapour pressure setting value and the practical main vapour pressure deviation of unit.The present invention considers influence one comprehensively
Influence of each variable of secondary wind pressure setting value for result, and the calculating process of primary wind pressure force value is optimized, make one
Secondary wind pressure setting value more accurately meets the requirement of coal pulverizer, reduces the fluctuation of unit main vapour pressure value, stablizes unit fortune
Row, and the economy of unit operation is improved, reduce the electricity loss of First air unit.
Embodiment 1
As shown in Figure 1 to Figure 2, a kind of coal-grinding unit primary air pressure control method is disclosed in the present embodiment.Thermal power plant
One unit generally configures two primary air fans, and the primary wind pressure that more coal pulverizers are provided by primary air fan is by its internal milled
Coal dust blow in boiler and burn, realize energy conversion.In order to preferably control the coal dust into burner hearth, on the one hand depend on
In the power output of coal pulverizer, the primary air pressure setting value of the First air with the coal-grinding unit for taking powder ability is on the other hand depended on
(primary air pressure and First air air quantity).The primary air pressure setting value of coal-grinding unit is that control system passes through to primary air pressure
Setting value variable carries out what operation obtained.
As shown in Figure 1, primary air pressure setting value variable of the invention includes：The letter that load instruction is instructed through unit load
Biasing 1, load instruction and the unit load deviation of functional value, coal pulverizer demand total blast volume 3, operator's setting after several 2 operations
Value, main vapour pressure setting value and the practical main vapour pressure deviation of unit form.
The wherein biasing 1 of operator's setting and the functional value after 2 operation of function that instructs through unit load of load instruction are
The primary air pressure setting value variable applied in the prior art.The two variables are the benchmark of primary air pressure setting value, according to
Empirical parameter setting can deviate coal pulverizer for the needs of primary air pressure, while increasing machine if setting deviation is too big
Group auxiliary power consumption.
The present invention and the prior art are not both to increase new primary air pressure setting value variable, stress this below
Several new variables.These new variables include：Coal pulverizer demand total blast volume 3, load instruction and unit load deviation, main vapour
Pressure set points and the practical main vapour pressure deviation of unit.
1, coal pulverizer demand total blast volume 3：
The present invention becomes coal pulverizer demand total blast volume 3 as the primary air pressure setting value for influencing primary air pressure setting value
Amount.The coal pulverizer demand total blast volume is determined by the quantity of operation coal pulverizer and the intake of each coal pulverizer.It works in coal pulverizer
When, the reasons such as type, coal input quantity of raw coal can all influence the working efficiency of coal pulverizer, to make the throttle opening value of coal pulverizer
Constantly changing, the result of this variation causes the total blast volume of pre-set each coal pulverizer demand also constantly changing.
If primary air fan cannot be according to the size of the corresponding adjustment primary wind pressure of variation of coal pulverizer, this may go out
It is existing：The primary wind pressure of primary air fan output is lower than the total blast volume of current each coal pulverizer demand and leads to coal pulverizer job insecurity；
Or primary wind pressure is greater than the required total blast volume of each coal pulverizer, causes primary wind pressure that cannot make full use of and cause primary air fan
Energy consumption waste.
The damper that each coal pulverizer passes through itself adjusts respective intake, and (i.e. throttle opening value determines the big of intake
It is small), intake size among these needs to be determined according to the actual conditions of each coal pulverizer, the coal class that such as uses, at that time into
Coal amount etc..Therefore every coal pulverizer might not be identical in the intake of synchronization, this results in total air inlet of each coal pulverizer
Magnitude is constantly changing.
Coal pulverizer mixing windshield plate is adjusted according to the coal-supplying amount of every coal pulverizer, changes coal pulverizer inlet primary air flow.It is many
It is well known：Under identical mixed windshield plate aperture, different primary wind pressures take powder ability difference, i.e., not into the coal amount size of burner hearth
Together, hearth combustion is influenced, to influence the fluctuation of unit main vapour pressure.The coal pulverizer that the present invention will be determined by mixing windshield plate aperture
A variable of the demand total blast volume 1 as primary air pressure setting value, reflects coal pulverizer load condition to a certain extent, makes to control
System processed can adjust in time unit primary air fan movable vane aperture, to reduce primary air fan auxiliary power consumption according to unit needs.
Its accounting 1% in the present embodiment.Windshield plate aperture variable pass corresponding with the function of coal pulverizer demand total blast volume is mixed as coal pulverizer
System can very easily be calculated according to existing DCS system and arithmetic system, not repeated here the calculation process.
2, load instruction and unit load deviation：
Load instruction described in the present embodiment and unit load deviation include：Use lead-lag LEADLAG1 (attached drawing
Label 4) module calculated load instruction and one setting time T1 of unit load deviation after value and load instruction current value difference
Value A, T1 is 30 seconds in the present embodiment, i.e. the load instruction of operation and unit load deviation is that load instruction and unit load are inclined
Poor 30 seconds variable quantities.Pass through another LEADLAG module-using the obtained difference A after lead-lag LEADLAG1 operation
LEADLAG2 (drawing reference numeral 5) becomes the load instruction and unit load deviation after being filtered, it is preferable that this reality
Apply LEADLAG2 (drawing reference numeral 5) the module progress of example is to be filtered for 18 seconds.
Load instruction and unit load deviation are the variations in 30 seconds of load instruction and unit load deviation in the present embodiment
Amount：When dispatch command (AGC instruction) variation, unit load instructs LDCOUT to follow dispatch command with certain load changing rate
Variation, unit load does not change also at this time, and LEADLAG1 (drawing reference numeral 4) module is a pure lag system, i.e. load instruction
And the value after unit load deviation 30 seconds and current value take its difference, and 18 seconds through LEADLAG2 (drawing reference numeral 5) are filtered
A part as primary air pressure setting value afterwards.This partial action：When unit load increase and decrease, First air is adjusted in advance
Pressure set points make it adapt to demand of the coal pulverizer to First air in time, to reach the variation of stable unit main vapour pressure.
3, main vapour pressure setting value and the practical main vapour pressure deviation of unit：
Main vapour pressure setting value described in the present embodiment includes with unit main vapour pressure deviation：Use lead-lag
When LEADLAG3 (drawing reference numeral 6) modular computer group main vapour pressure setting value and the deviation one of the practical main vapour pressure of unit are set
Between value and unit main vapour pressure setting value after T2 current value difference B, T2 is 60 seconds in the present embodiment.That is the main vapour of operation
Pressure set points and the practical main vapour pressure deviation of unit are main vapour pressure setting value and the deviation change in 60 seconds of unit main vapour pressure
Change amount.Pass through another LEADLAG module-LEADLAG4 (attached drawing using the difference B obtained after lead-lag LEADLAG3 operation
Label 7) be filtered after become the main vapour pressure setting value and the practical main vapour pressure deviation of unit.Preferably, originally
What LEADLAG4 (drawing reference numeral 7) module of embodiment carried out is to be filtered for 12 seconds.
The main vapour pressure setting value and the practical main vapour pressure deviation of unit of the present embodiment are main vapour pressure setting value and machine
Group 60 seconds variable quantities of main vapour pressure deviation：The deviation of unit main vapour pressure setting value and unit actual pressure, through LEADLAG3
(drawing reference numeral 6) module is a pure lag system, i.e., main vapour pressure setting value and after the deviation of unit actual pressure 60 seconds it
Value and current value take its difference, as primary air pressure setting value after filtering processing in LEADLAG4 (drawing reference numeral 7) 12 seconds
A part.No matter unit main vapour pressure setting value caused by any reason (unit operating condition or exception or failure) and unit are real
Border pressure is inconsistent, which can all adjust primary air pressure setting value in time, it is made to adapt to coal pulverizer in time to First air
Demand, to reach the variation of stable unit main vapour pressure.
Load instruction and unit load deviation and main vapour pressure setting value and the practical main vapour pressure deviation of unit, this two
A kind of adjustment means of part when being unit dynamic operation condition, in time if adjustment, to stablizing this parameter of unit main vapour pressure
There is good booster action.The present invention has not only carried out timely adjustment also to the two numerical value while having stablized hearth combustion, obtains
Primary air pressure setting value accurately reflects the variation of unit dynamic operation condition and reduces the balance between the fluctuation of unit main vapour pressure.
Solve previous unit primary air pressure setting value to be adjusted according only to load instruction, that is, according to AGC instruction change into
When row adjustment, although load variations can be adapted to more quickly, due to not considering the operating condition of coal pulverizer, unit master is caused
Vapour pressure fluctuation is big, energy waste, and reduce unit operation economy the problem of.
The present invention is other than increasing above three primary air pressure setting value variable, also to existing load instruction
(LDCOUT) functional value after 3 operation of function of unit load instruction is optimized.From energy-efficient angle, machine is reduced
Group primary air pressure setting value, is revised as 7~9.5KPa from 8 original~13KPa, still can satisfy unit needs in this way.
Only this saves the amount of station service with regard to considerable for 6KV motor.The primary air pressure of the invention is set
Definite value variable sums up in DCS system according to respective weight, finally obtains accurately and effectively primary air pressure and sets
Definite value.
The accuracy for improving primary air pressure set value calculation, improves the precision of unit allocation, just it has to be ensured that machine
The numerical value of the tested primary air pressure of group is more in line with the actual working condition of system, this is the base realizing unit and being precisely controlled
Plinth.
The present invention shifts coal pulverizer primary air pressure sampling test point, makes its measurement can be more representative.
As shown in Fig. 2, accurate for control, the present invention has carried out displacement transformation to primary air pressure measuring point.Before transformation
Primary air pressure measurement point 9, be taken respectively from the outlet of two primary air fans, surveyed after the low value side-draw of A, B two as primary wind pressure
Magnitude.Due to that far, can not reflect the practical primary wind pressure of system apart from outlet air main pipe distance, make tested out primary air pressure
There is very big errors for value, this has resulted in the inaccuracy to blower feedback control.
As shown in Fig. 2, the present invention shifts measuring point.The measurement point 8 of improved primary air pressure moves measuring point
Position in the closer heat primary air main pipe of coal pulverizer, and by measuring point quantity by original A each two o'clock in the side B be changed to it is hot primary
3 points of wind main pipe, process three take middle as system primary air pressure measured value.Such measurement position is closer to blower
Outlet air position, measurement result are better able to close to the actual working condition of blower, at the same using multiple spot take in method reduce again
As individual measuring points failure and caused by influence.
In the present invention, primary air pressure measured value is derived from primary air fan outlet primary air pressure, two primary air fan outlets
Each two measuring points take after mean value through too small modeling block take it is small after as primary air pressure measured value, two are distributed to after PID arithmetic
Platform primary air fan inlet guide vane, by adjusting inlet guide vane aperture, to influence coal pulverizer demand total blast volume 3 and then to adjust one
Secondary wind pressure.The feedback control of realization system.
Embodiment 2
The present embodiment discloses a kind of control system for applying coal-grinding unit primary air pressure control method as described in Example 1
System, the primary air pressure setting value of coal-grinding unit are obtained by carrying out operation to primary air pressure setting value variable, described one
Secondary wind pressure setting value variable includes：Functional value of the load instruction after functional operation, coal pulverizer demand total blast volume, operator set
Fixed biasing, load instruction and unit load deviation, main vapour pressure setting value and the practical main vapour pressure deviation of unit.
As shown in Figure 1, primary air pressure setting value variable of the invention includes：The letter that load instruction is instructed through unit load
Biasing 1, load instruction and the unit load deviation of functional value, coal pulverizer demand total blast volume 3, operator's setting after several 2 operations
Value, main vapour pressure setting value and the practical main vapour pressure deviation of unit form.
The wherein biasing 1 of operator's setting and the functional value after 2 operation of function that instructs through unit load of load instruction are
The primary air pressure setting value variable applied in the prior art.The two variables are the benchmark of primary air pressure setting value, according to
Empirical parameter setting can deviate coal pulverizer for the needs of primary air pressure, while increasing machine if setting deviation is too big
Group auxiliary power consumption.
The present invention and the prior art are not both to increase new primary air pressure setting value variable, stress this below
Several new variables.These new variables include：Coal pulverizer demand total blast volume 3, load instruction and unit load deviation, main vapour
Pressure set points and the practical main vapour pressure deviation of unit.
1, coal pulverizer demand total blast volume 3：
The present invention becomes coal pulverizer demand total blast volume 3 as the primary air pressure setting value for influencing primary air pressure setting value
Amount.In coal pulverizer work, the reasons such as type, coal input quantity of raw coal can all influence the working efficiency of coal pulverizer, to make coal-grinding
The throttle opening value of machine is also constantly changing, and the result of this variation leads to the total blast volume of pre-set each coal pulverizer demand
Constantly changing.
The present invention is by the coal pulverizer demand total blast volume 1 determined by mixed windshield plate aperture as primary air pressure setting value
One variable, reflects coal pulverizer load condition to a certain extent, enables control system according to unit needs, adjusts machine in time
Group primary air fan movable vane aperture, to reduce primary air fan auxiliary power consumption.Its accounting 1% in the present embodiment.It is mixed as coal pulverizer
The function corresponding relationship of windshield plate aperture variable and coal pulverizer demand total blast volume can be very according to existing DCS system and arithmetic system
It is easily calculated, the calculation process is not repeated here.
2, load instruction and unit load deviation：
Load instruction described in the present embodiment and unit load deviation include：Use lead-lag LEADLAG1 (attached drawing
Label 4) module calculated load instruction and one setting time T1 of unit load deviation after value and load instruction current value difference
Value A, T1 is 30 seconds in the present embodiment, i.e. the load instruction of operation and unit load deviation is that load instruction and unit load are inclined
Poor 30 seconds variable quantities.Pass through another LEADLAG module-using the obtained difference A after lead-lag LEADLAG1 operation
LEADLAG2 (drawing reference numeral 5) becomes the load instruction and unit load deviation after being filtered, it is preferable that this reality
Apply LEADLAG2 (drawing reference numeral 5) the module progress of example is to be filtered for 18 seconds.
3, main vapour pressure setting value and the practical main vapour pressure deviation of unit：
Main vapour pressure setting value described in the present embodiment includes with unit main vapour pressure deviation：Use lead-lag
When LEADLAG3 (drawing reference numeral 6) modular computer group main vapour pressure setting value and the deviation one of the practical main vapour pressure of unit are set
Between value and unit main vapour pressure setting value after T2 current value difference B, T2 is 60 seconds in the present embodiment.That is the main vapour of operation
Pressure set points and the practical main vapour pressure deviation of unit are main vapour pressure setting value and the deviation change in 60 seconds of unit main vapour pressure
Change amount.Pass through another LEADLAG module-LEADLAG4 (attached drawing using the difference B obtained after lead-lag LEADLAG3 operation
Label 7) be filtered after become the main vapour pressure setting value and the practical main vapour pressure deviation of unit.Preferably, originally
What LEADLAG4 (drawing reference numeral 7) module of embodiment carried out is to be filtered for 12 seconds.
Load instruction and unit load deviation and main vapour pressure setting value and the practical main vapour pressure deviation of unit, this two
A kind of adjustment means of part when being unit dynamic operation condition, in time if adjustment, to stablizing this parameter of unit main vapour pressure
There is good booster action.The present invention has not only carried out timely adjustment also to the two numerical value while having stablized hearth combustion, obtains
Primary air pressure setting value accurately reflects the variation of unit dynamic operation condition and reduces the balance between the fluctuation of unit main vapour pressure.
Solve previous unit primary air pressure setting value to be adjusted according only to load instruction, that is, according to AGC instruction change into
When row adjustment, although load variations can be adapted to more quickly, due to not considering the operating condition of coal pulverizer, unit master is caused
Vapour pressure fluctuation is big, energy waste, and reduce unit operation economy the problem of.
The present invention is other than increasing above three primary air pressure setting value variable, also to existing load instruction
(LDCOUT) functional value after 3 operation of function of unit load instruction is optimized.From energy-efficient angle, machine is reduced
Group primary air pressure setting value, is revised as 7~9.5KPa from 8 original~13KPa, still can satisfy unit needs in this way.
Only this saves the amount of station service with regard to considerable for 6KV motor.The primary air pressure of the invention is set
Definite value variable sums up in DCS system according to respective weight, finally obtains accurately and effectively primary air pressure and sets
Definite value.
As shown in Fig. 2, accurate for control, the present invention has carried out displacement transformation to primary air pressure measuring point.Before transformation
Primary air pressure measurement point 9.Two primary air fan outlets are taken respectively from, are surveyed after the low value side-draw of A, B two as primary wind pressure
Magnitude.Due to that far, can not reflect the practical primary wind pressure of system apart from outlet air main pipe distance, make tested out primary air pressure
There is very big errors for value, this has resulted in the inaccuracy to blower feedback control.
As shown in Fig. 2, the present invention shifts measuring point.The measurement point 8 of improved primary air pressure moves measuring point
Position in the closer heat primary air main pipe of coal pulverizer, and by measuring point quantity by original A each two o'clock in the side B be changed to it is hot primary
3 points of wind main pipe, process three take middle as system primary air pressure measured value.Such measurement position is closer to blower
Outlet air position, measurement result are better able to close to the actual working condition of blower, at the same using multiple spot take in method reduce again
As individual measuring points failure and caused by influence.
The primary air pressure measured value of this control system is derived from primary air fan outlet primary air pressure, and two primary air fans go out
Mouthful each two measuring points take after mean value through too small modeling block take it is small after as primary air pressure measured value, distributed to after PID arithmetic
Two primary air fan inlet guide vanes, by adjusting inlet guide vane aperture, to influence coal pulverizer demand total blast volume 3 and then to adjust
Primary air pressure.The feedback control of realization system.
The above is only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this patent
Member without departing from the scope of the present invention, when the technology contents using above-mentioned prompt make it is a little change or be modified to
The equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, it is right according to the technical essence of the invention
Any simple modification, equivalent change and modification made by above embodiments, in the range of still falling within the present invention program.
Claims (10)
1. a kind of coal-grinding unit primary air pressure control method, be used for fired power generating unit, the fired power generating unit include coal-grinding unit and
Its control system, which is characterized in that the primary air pressure setting value of coal-grinding unit is control system by setting to primary air pressure
Definite value variable carries out operation and obtains, and the primary air pressure setting value variable includes：Function of the load instruction after functional operation
Biasing, load instruction and unit load deviation, the main vapour pressure setting value that value, coal pulverizer demand total blast volume, operator set
With the practical main vapour pressure deviation of unit.
2. coal-grinding unit primary air pressure control method according to claim 1, which is characterized in that the coal pulverizer demand
Total blast volume is determined by the quantity of operation coal pulverizer and the intake of each coal pulverizer；The intake of each coal pulverizer is according to coal-grinding
The mixed windshield plate aperture of machine adjusts；
Preferably, the mixed windshield plate aperture is determined by coal class and/or coal input quantity；
Preferably, the coal pulverizer demand total blast volume accounts for the 1% of primary air pressure setting value.
3. coal-grinding unit primary air pressure control method according to claim 1, which is characterized in that the load instruction and
Unit load deviation includes：When being set using the instruction of lead-lag LEADLAG module calculated load and unit load deviation one
Between value and load instruction after T1 current value difference A, which is LEADLAG1；
Preferably, T1 is 30 seconds.
4. coal-grinding unit primary air pressure control method according to claim 3, which is characterized in that the difference A passes through
Another LEADLAG module-LEADLAG2 becomes the load instruction and unit load deviation after being filtered；
Preferably, what LEADLAG2 module carried out is to be filtered for 18 seconds.
5. coal-grinding unit primary air pressure control method according to claim 1, which is characterized in that the main vapour pressure is set
Definite value includes with unit main vapour pressure deviation：It is practical using LEADLAG modular computer group main vapour pressure setting value and unit
The difference B, the LEADLAG of the current value of value and unit main vapour pressure setting value after the one setting time T2 of deviation of main vapour pressure
Module is LEADLAG3；
Preferably, T2 is greater than T1；
It is further preferred that T2 is 60 seconds.
6. coal-grinding unit primary air pressure control method according to claim 5, which is characterized in that the difference B passes through
Another LEADLAG module-LEADLAG4 becomes the main vapour pressure setting value and unit actually main vapour after being filtered
Pressure divergence value；
Preferably, what LEADLAG4 module carried out is to be filtered for 12 seconds.
7. coal-grinding unit primary air pressure control method according to any one of claims 1 to 6, which is characterized in that the mill
The primary air pressure setting value of coal unit is 7~9.5Kpa.
8. coal-grinding unit primary air pressure control method according to any one of claims 1 to 7, which is characterized in that thermal motor
The measurement point of the primary air pressure of the coal-grinding unit of group is arranged in heat primary air main pipe, and fired power generating unit is examined according to the measurement point
The primary air pressure measured carries out the adjusting of coal pulverizer primary air pressure.
9. coal-grinding unit primary air pressure control method according to claim 8, which is characterized in that the measurement point is more
It is a, and the primary wind pressure force value obtained to each measurement point measurement carries out that middle operation is taken to obtain primary air pressure measured value；
Preferably, measurement point is 3.
10. a kind of control system of application coal-grinding unit primary air pressure control method as described in claim 1 to 9 is any,
It being characterized in that, the primary air pressure setting value of coal-grinding unit is obtained by carrying out operation to primary air pressure setting value variable,
The primary air pressure setting value variable includes：Functional value of the load instruction after functional operation, coal pulverizer demand total blast volume, behaviour
The biasing of work person's setting, load instruction and unit load deviation, main vapour pressure setting value and the practical main vapour pressure deviation of unit
Value.
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| CN111250253A (en) * | 2020-03-04 | 2020-06-09 | 广东电科院能源技术有限责任公司 | Self-adaptive control method, system and equipment for dynamic separator of coal mill |
| CN112327778A (en) * | 2020-11-13 | 2021-02-05 | 华润电力（涟源）有限公司 | Automatic primary air pressure adjusting method for thermal power plant |
| CN112947335A (en) * | 2021-02-05 | 2021-06-11 | 吉林省电力科学研究院有限公司 | Method for improving stability of main steam pressure of thermal power generating unit coordinated control system |
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| CN110397614A (en) * | 2019-07-16 | 2019-11-01 | 华能国际电力股份有限公司丹东电厂 | A kind of airflow pressure automatic control system of fired power generating unit |
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| CN112327778A (en) * | 2020-11-13 | 2021-02-05 | 华润电力（涟源）有限公司 | Automatic primary air pressure adjusting method for thermal power plant |
| CN112947335A (en) * | 2021-02-05 | 2021-06-11 | 吉林省电力科学研究院有限公司 | Method for improving stability of main steam pressure of thermal power generating unit coordinated control system |
| CN112947335B (en) * | 2021-02-05 | 2024-05-07 | 吉林省电力科学研究院有限公司 | Method for improving pressure stability of main steam of coordination control system of thermal power generating unit |
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