CN106423526B - Low speed coal mill wind system intelligent control method and module - Google Patents
Low speed coal mill wind system intelligent control method and module Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/04—Safety devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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Abstract
Low speed coal mill wind system intelligent control method and module are related to the control technology of low speed coal mill wind system, in order to meet the growth requirement of low speed coal mill.The present invention acquires the inlet pressure level and Outlet Temperature value of low speed coal mill first, when inlet pressure reaches HVT high voltage threshold or outlet temperature reach a high temperature threshold value when, transient state control is carried out using PID control technology, otherwise, stable state control is carried out using fuzzy control technology.Present invention employs the separated control technologies of transient state and stable state, not only ensure that the quick response of time of crisis, but also realize the steady adjusting under stable case, reduce the operating frequency of air door, extend the service life of air door.Due to taking intelligent control scheme in stable state, hence it is evident that the drying capacity and ventilation for improving coal pulverizer are contributed, and coal pulverizer power consumption is reduced.Suitable for low speed coal mill.
Description
Technical field
The present invention relates to the control technologies of low speed coal mill wind system.
Background technology
Low speed coal mill (hereinafter referred to as coal pulverizer) is the important ancillary equipment of middle powder-storage bin formula pulverized-coal fired boiler, and being used for will be former
Coal grinding is stored at the coal dust of certain fineness in pulverized coal bin.When coal pulverizer is run, mill tube rotates, and the steel ball in mill tube is interior
It falls by its own gravity after cornice to certain altitude, coal is deposited in impacting tube, deposit coal and be crashed to pieces into coal dust, coal dust is by wind from coal-grinding
It is separated in machine, and after the separation of tailing separator, pulverized-coal collector and cyclone separator, falls into pulverized coal bin and store.
Therefore, the wind system of coal pulverizer is most important, and the effect that carry dry raw coal, detach coal dust, pulverized coal conveying directly affects mill
The output (weight that qualified coal dust is made in the unit interval) of coal machine.The entrance wind pressure (abbreviation inlet pressure) of coal pulverizer, outlet
Wind powder temperature (abbreviation outlet temperature) represents the wind system operating index of coal pulverizer.To make, coal pulverizer is safe and stable, efficiently transports
Row, the inlet pressure and outlet temperature of coal pulverizer must control in a certain range.
The influence that coal pulverizer inlet pressure and outlet temperature run coal pulverizer is as follows：
Inlet pressure：If inlet pressure is high, it be easy to cause coal pulverizer inlet and runs powder；If inlet pressure is low, into coal pulverizer
Air quantity reduce, not enough air quantity conveying and separation coal dust, pulverizer capacity reduce.It can also be led in addition, inlet pressure is low
Refrigerated air enters pulverized coal preparation system, enters burner hearth with tertiary air, reduces the efficiency of combustion of boiler.Therefore, ensureing not run powder
Under the premise of, the inlet pressure of coal pulverizer need to be improved as possible, it is maximum to reach ventilation output, improve the purpose of boiler combustion efficiency.
Outlet temperature：If outlet temperature is high, it be easy to cause pulverized coal preparation system pipeline and pulverized coal bin temperature increases, will have when continuing
The danger of detonation；If outlet temperature is low, raw coal drying is insufficient, and steel ball impact raw coal, crushing efficiency are low, drying capacity of pulverizer
Decline.Therefore, under the premise of ensureing pulverized coal preparation system safe operation, the outlet temperature of coal pulverizer should be improved as possible, to reach mill
The drying capacity of coal machine is maximum.
The relationship of inlet pressure and outlet temperature：When the inlet pressure of coal pulverizer and outlet temperature conflict, Ying You
It is not excessively high first to meet inlet pressure, prevents coal pulverizer inlet " run about coal ", it is not excessively high that next meets outlet temperature, prevents detonation.
After meeting above-mentioned two primary condition, the inlet pressure and outlet temperature of coal pulverizer are improved as possible, reach pulverizer capacity maximum
Change.
Air quantity into coal pulverizer is made of, wind hot wind, warm air, cold wind and reduced air (mixture of coal dust and wind)
The size of amount is adjusted by hot air disperser, warm air door, cold-air flap and recirculation door respectively, is adjusted any one air door, can all be influenced to grind
The inlet pressure and outlet temperature of coal machine.Therefore, it is necessary in real time according to the inlet pressure of coal pulverizer and outlet temperature and various
The adjustable nargin of air door calculates the size for adjusting which air door and the amplitude of accommodation, just can ensure that the peace of coal pulverizer operation
It is complete stable and efficient.
But there are a variety of random perturbations when coal pulverizer operation, as firmness change, the humidity of raw coal change, the source of wind
The internal disturbance that disturbance, defeated device for coal are broken between uneven coal, coal-supplying amount, worn steel ball and various air quantity.Coal pulverizer itself is also
There is regulating cycles it is long, inertia is big the problems such as.Therefore, coal pulverizer be a typical close coupling, it is non-linear, variable element, big
The complication system of lag, it is difficult to which realization automatically controls.The conventional DCS Combining soft controls method being especially widely used at present, at this
After the application of class coal pulverizer, inlet pressure and outlet temperature adjusting are not caught up with, and are not to adjust when " disconnected coal " occurs or coal quality changes
" excessively slow " is exactly adjusted " too fast ".If adjusting " excessively slow ", lead to coal pulverizer because inlet pressure cannot recall to (excessively high) in time
" running powder ", or lead to pulverized coal preparation system detonation because outlet temperature cannot recall to (excessively high) in time；If adjusting " too fast ", entrance pressure
Power and outlet temperature are shaken repeatedly, it is difficult to reach " qualification " state simultaneously, even if there is " qualification " state appearance simultaneously, are also
" short-lived ", cannot be permanent, and the thing followed is the frequent adjusting of various air doors, and pulverizer capacity declines, air door abrasion
It is serious even to damage.In addition, the quick concussion of various air doors is adjusted, it can also cause the big ups and downs of furnace pressure, have when serious
The danger of fire extinguishing blowing out.So at present all operations low speed coal mill be all difficult to realize it is steady in a long-term automatically control, still
Manually adjust.It is frequent operation to adjust the problem of bringing manually, and energy high concentration is careless slightly, it is easy to cause
" running powder " or pulverized coal preparation system " detonation ", jeopardize the operational safety of boiler.To ensure the safe operation of coal pulverizer, operations staff must not
The inlet pressure and outlet temperature index for not reducing coal pulverizer, so that there are larger safety margins.But this causes coal pulverizer again
The decline of output, power consumption increase.
Therefore, it there is an urgent need to research and develop new automatic control technology, solves the problems, such as automatically controlling for such coal pulverizer operation, is
It cuts payroll to improve efficiency, it is energy-saving to create conditions.
Invention content
The purpose of the invention is to meet the operation demand of low speed coal mill, a kind of low speed coal mill wind system intelligence is provided
It can control method and module.
Low speed coal mill wind system intelligent control method of the present invention includes the following steps：
Sampling step：Acquire the inlet pressure level and Outlet Temperature value of low speed coal mill；
Control mode judgment step：When inlet pressure reaches HVT high voltage threshold or outlet temperature reach a high temperature threshold value when,
Execute transient state rate-determining steps；Otherwise, stable state rate-determining steps are executed；
The transient state rate-determining steps are：Hot air disperser and warm air door are controlled using PID controller, are then back to execution sampling step
Suddenly；
Stable state rate-determining steps：Using fuzzy control method control hot air disperser, warm air door, recirculation door and cold-air flap, so
It returns afterwards and executes sampling step.
Low speed coal mill wind system intelligent control module of the present invention includes with lower unit：
Sampling unit：Acquire the inlet pressure level and Outlet Temperature value of low speed coal mill；
Control mode judging unit：When inlet pressure reaches HVT high voltage threshold or outlet temperature reach a high temperature threshold value when,
Start transient state control unit；Otherwise, start stable state control unit；
Transient state control unit：Hot air disperser and warm air door are controlled using PID controller, are then back to startup sampling unit；
Stable state control unit：Using fuzzy control technology control hot air disperser, warm air door, recirculation door and cold-air flap, so
It returns afterwards and starts sampling unit.
The control of such coal pulverizer operation at present generally uses single loop PID configuration methods, it is difficult to realize that complicated logic is sentenced
It is disconnected to be calculated with largely analysis, it cannot be run steadily in the long term after throwing automatically, can only release automatically, manually adjust.This hair
The bright all problems for considering such coal pulverizer and encountering in actual operation, and these problems are directed to, decision logic is provided respectively
And control program, the various disturbing factors during coal pulverizer automatically controls are effectively overcomed, the long-term of coal pulverizer operation is realized
Stabilization automatically controls.As a result of the separated control technology of transient state and stable state, the quick response of time of crisis not only ensure that, but also
The steady adjusting under stable case is realized, the operating frequency of air door is reduced, extends the service life of air door.Again due to
Intelligent control scheme is taken when stable state, hence it is evident that the drying capacity and ventilation for improving coal pulverizer are contributed, and coal-grinding electromechanics is reduced
Consumption.Above-mentioned advantage is verified after this technology practical application.
Description of the drawings
Fig. 1 is the flow chart of the low speed coal mill wind system intelligent control method described in embodiment one；
Fig. 2 is the flow chart of transient state rate-determining steps in embodiment two；
Fig. 3 is the flow chart of stable state rate-determining steps in embodiment four.
Specific implementation mode
Specific implementation mode one：Embodiment is described with reference to Fig. 1, the low speed coal mill wind system described in present embodiment
Intelligent control method includes the following steps：
Sampling step：Acquire the inlet pressure level and Outlet Temperature value of low speed coal mill；
Control mode judgment step：When inlet pressure reaches HVT high voltage threshold or outlet temperature reach a high temperature threshold value when,
Execute transient state rate-determining steps；Otherwise, stable state rate-determining steps are executed；
The transient state rate-determining steps are：Hot air disperser and warm air door are controlled using PID controller, are then back to execution sampling step
Suddenly；
Stable state rate-determining steps：Using fuzzy control method control hot air disperser, warm air door, recirculation door and cold-air flap, so
It returns afterwards and executes sampling step.
Present embodiment realizes transient state control using PID controller, and stable state control is realized using fuzzy (FUZZY) controller
System.Fuzzy control is the Typical Representative of artificial intelligence control, its apish thinking logic, to the moving law of controlled device
(often without exact mathematical model) summarizes, is abstracted, reasoning and quantization, implementation effectively control.The base of fuzzy control
Plinth is fuzzy mathematics, using the inference theory of fuzzy mathematics, establishes membership function database offline, by the process pair of various complexity
As simplifying.The process needs to fully understand controlled device, and only the directory operator with rich experiences can just sum up
Rule, and establish membership function database.When on-line operation, using the high speed and large capacity performance of computer, pass through reasoning
Specific controlled quentity controlled variable is obtained with quantization operations.Fuzzy control is a kind of gamma controller, is suitable for time-varying, non-linear and strong coupling
Collaboration is united.
The course of work of FUZZY controllers is mainly made of four parts：
(1) it is blurred
The effect of this part is to handle the precise volume of input, is converted into the input quantity of fuzzy controller requirement.It is right
Processed input quantity carries out change of scale, so that it is transformed to respective domain range, then carries out Fuzzy Processing, is used in combination corresponding
Fuzzy set indicate.Wherein input quantity includes output or the state of extraneous reference input, system.
(2) knowledge base
Knowledge base is usually made of database and fuzzy rule base two parts.Database includes the person in servitude of each linguistic variable
The classification number etc. of category degree function, the change of scale factor and fuzzy space.Rule base includes to be indicated with Fuzzy Linguistic Variable
A series of control rules, they reflect the experience and knowledge actually controlled.
(3) fuzzy reasoning
Fuzzy reasoning is the core of FUZZY controllers, fuzzy reasoning process be based in fuzzy logic implication relation and
Inference rule carries out.
(4) sharpening
The effect of sharpening is that the controlled quentity controlled variable that will be obscured becomes to indicate the clear amount in domain range through sharpening, most
After will clearly measure through dimensional variation into actual controlled quentity controlled variable.
Low speed coal mill wind system intelligent control method described in present embodiment, according to the carrying out practically of low speed coal mill
Its adjustment process is divided into transient state and stable state by situation using intelligent control technology.PID control technology is used when transient state, for grinding
Quick adjusting when coal machine inlet pressure is more than the upper limit or pulverizer outlet temperature is more than the upper limit；Fuzzy control is then used when stable state
Device is controlled, and every operating parameter of comprehensive analysis coal pulverizer takes corresponding control strategy, it is ensured that coal pulverizer operational safety
Stablize, while also improving the output of coal pulverizer.
Specific implementation mode two：Embodiment is described with reference to Fig. 2, and present embodiment is to the steel described in embodiment one
Ball coal pulverizer wind system intelligent control method further limits, and in present embodiment, the transient state rate-determining steps are specially：
When outlet temperature reaches a high temperature threshold value, hot air disperser aperture output valve AO_rfm=AO_rfm_1+du_rfm+ Δs
Rfm controls hot air disperser according to the hot air disperser aperture output valve AO_rfm, and continuously performs Tzt controlling cycle；
When inlet pressure reaches HVT high voltage threshold, warm throttle opening output valve AO_wfm=AO_wfm_1+du_wfm+ Δs
Wfm controls warm air door according to warm throttle opening output valve AO_wfm, and continuously performs Tzt controlling cycle；
Wherein, AO_rfm_1 and AO_wfm-1 is respectively that the aperture control of previous controlling cycle hot air disperser and warm air door is defeated
Go out value；
Du_rfm and du_wfm is respectively the increment that this controlling cycle hot air disperser and warm throttle opening control output valve；du_
Rfm and du_wfm are calculated by PID controller.For example, the setting value of current Outlet Temperature value and outlet temperature is subtracted each other,
Obtained deviation is input in PID controller, and du_rfm is calculated in PID controller；By current inlet pressure level and entrance
Pressure set points are subtracted each other, and obtained deviation is input in PID controller, and du_wfm is calculated in PID controller.
Δ rfm, Δ wfm are respectively the feedforward amount in this controlling cycle hot air disperser, warm throttle opening control output valve calculating,
It is directly proportional to warm air door, hot air disperser aperture respectively；
Tzt is that transient process control continues the execution time.
Feedforward compensation of the hot air disperser opening amount signal as warm airdoor control output is introduced during transient state control, introduces temperature
Then feedforward compensation of the throttle opening signal as hot air disperser control output utilizes PID controller to calculate hot air disperser aperture and exports
Value and warm throttle opening output valve, hot air disperser and warm air door are controlled with this.
Specific implementation mode three：Embodiment is described with reference to Fig. 2, and present embodiment is to the steel described in embodiment two
Ball coal pulverizer wind system intelligent control method further limits, in transient state rate-determining steps, if outlet temperature reaches a high temperature
Threshold value, then Tzt=Tzt1；Otherwise, Tzt=Tzt2；Tzt1 > Tzt2.
A usual controlling cycle is 1 second, can take Tzt1=200, Tzt2=400.So, when inlet pressure reaches high
Pressure threshold value but outlet temperature do not reach a high temperature threshold value when, according to the hot air disperser aperture output valve AO_rfm control hot air disperser,
And continuously perform 200 controlling cycles.When outlet temperature reaches a high temperature threshold value, controlled according to warm throttle opening output valve AO_wfm
Warm air door processed, and continuously perform 400 controlling cycles.
Specific implementation mode four：Embodiment is described with reference to Fig. 3, and present embodiment is to described in embodiment one and two
Low speed coal mill wind system intelligent control method further limit, in present embodiment,
SP_P is inlet pressure setting value, and P points of inlet pressure is following four state：
Inlet pressure reaches HVT high voltage threshold：P≥SP_P+ΔP2；
Inlet pressure is higher：SP_P+ΔP2>P≥SP_P+ΔP1；Δ P2 > Δ P1,
Inlet pressure is moderate：SP_P+ΔP1>P>SP_P-ΔP1；
Inlet pressure is relatively low：P≤SP_P-ΔP1；
Δ P1 and Δ P2 is pre-set value；
Δ P1 and Δ P2 are set according to actual conditions, can usually take Δ P1=100Pa, Δ P2=200Pa；
SP_T is outlet temperature setting value, and T points of outlet temperature is following four state：
Outlet temperature reaches a high temperature threshold value：T≥SP_T+ΔT2；
Outlet temperature is higher：SP_T+ΔT2>T≥SP_T+ΔT1；Δ T2 > Δs T1；
Outlet temperature is moderate：SP_T+ΔT1>T>SP_T-ΔT1；
Outlet temperature is relatively low：T≤SP_T-ΔT1；
Δ T1 and Δ T2 are set according to actual conditions, can usually take T1=5 DEG C of Δ, T2=10 DEG C of Δ；
The stable state rate-determining steps include the following steps：
Outlet temperature and inlet pressure judgment step：Judge outlet according to collected Outlet Temperature value and inlet pressure level
State of temperature and inlet pressure state,
If outlet temperature state is relatively low, and inlet pressure state is relatively low, then executes heating wind step；
If outlet temperature state is relatively low, and inlet pressure state is moderate, then is performed simultaneously heating wind step and subtracts
Mixing wind step；
If outlet temperature state is relatively low, and inlet pressure state is higher, then executes and subtract mixing wind step；
If outlet temperature state is moderate, and inlet pressure state is relatively low, then is performed simultaneously heating wind step and adds
Mixing wind step；
If outlet temperature state is moderate, and inlet pressure state is moderate, then executes AO and keep step；
If outlet temperature state is moderate, and inlet pressure state is higher, then is performed simultaneously reduction of heat wind step and subtracts
Mixing wind step；
If outlet temperature state is higher, and inlet pressure state is relatively low, then executes and add mixing wind step；
If outlet temperature state is higher, and inlet pressure state is moderate, then is performed simultaneously reduction of heat wind step and adds
Mixing wind step；
If outlet temperature state is higher, and inlet pressure state is higher, then executes reduction of heat wind step；
Heat wind step：Increase hot air disperser aperture, is then back to execution sampling step；
Reduction of heat wind step：Hot air disperser aperture is reduced, execution sampling step is then back to；
Add mixing wind step：First increase warm throttle opening, it is rear to increase recirculation door aperture, finally increase cold-air flap aperture,
It is then back to execution sampling step；
Subtract mixing wind step：Cold-air flap aperture is first reduced, cycle door aperture is then reduced, finally reduces warm throttle opening,
It is then back to execution sampling step；
AO keeps step：It keeps each throttle opening constant, is then back to execution sampling step.
Air quantity into coal pulverizer can be defined as two parts, i.e. hot wind and mixing wind.Hot wind is after hot air disperser is adjusted
It is sent into the wind of coal pulverizer, mixing wind is that the wind of coal pulverizer is sent into after the adjusting of warm air door, cold-air flap and recirculation door, is warm air door
Export the summation of air quantity, cold-air flap outlet air quantity and recirculation door outlet air quantity.Stable state intelligent control is according to coal pulverizer inlet
Pressure state and outlet temperature state calculate the regulated quantity of hot wind and mixing wind, then respectively by hot air disperser and " warm air door+cold wind
Door+recirculation door " is implemented to adjust.
Add in mixing wind step, mixing wind regulated quantity controls output valve in the aperture of warm air door, recirculation door and cold-air flap
Optimum allocation ratio between increment is 1：2：4, it is divided between the optimal actuation time between warm air door, recirculation door and cold-air flap
10 seconds.Subtract in mixing wind step, mixing wind regulated quantity is reduced in the aperture control output valve of cold-air flap, recirculation door and warm air door
Optimum allocation ratio between amount is 1：2：4, the optimal actuation time interval between cold-air flap, recirculation door and warm air door
It is 10 seconds.
Specific implementation mode five：Embodiment is described with reference to Fig. 1, the low speed coal mill wind system described in present embodiment
Intelligent control module includes with lower unit：
Sampling unit：Acquire the inlet pressure level and Outlet Temperature value of low speed coal mill；
Control mode judging unit：When inlet pressure reaches HVT high voltage threshold or outlet temperature reach a high temperature threshold value when,
Start transient state control unit；Otherwise, start stable state control unit；
Transient state control unit：Hot air disperser and warm air door are controlled using PID controller, are then back to startup sampling unit；
Stable state control unit：Using fuzzy control technology control hot air disperser, warm air door, recirculation door and cold-air flap, so
It returns afterwards and starts sampling unit.
Low speed coal mill wind system intelligent control module described in present embodiment and the ball mill described in embodiment one
Coal machine wind system intelligent control method is corresponding.
Specific implementation mode six：Embodiment is described with reference to Fig. 2, and present embodiment is to the steel described in embodiment five
Ball coal pulverizer wind system intelligent control module further limits, and in present embodiment, the transient state control unit is specially：
When inlet pressure reaches HVT high voltage threshold, hot air disperser aperture output valve AO_rfm=AO_rfm_1+du_rfm+ Δs
Rfm controls hot air disperser according to the hot air disperser aperture output valve AO_rfm, and continuously performs Tzt controlling cycle；
When outlet temperature reaches a high temperature threshold value, warm throttle opening output valve AO_wfm=AO_wfm_1+du_wfm+ Δs
Wfm controls warm air door according to warm throttle opening output valve AO_wfm, and continuously performs Tzt controlling cycle；
Wherein, AO_rfm_1 and AO_wfm_1 is respectively that the aperture control of previous controlling cycle hot air disperser and warm air door is defeated
Go out value；
Du_rfm and du_wfm is respectively the increment of the aperture control output valve of this controlling cycle hot air disperser and warm air door；
Δ rfm, Δ wfm are respectively the feedforward amount of the aperture control output valve of this controlling cycle hot air disperser, warm air door；
Tzt is that transient process control continues the execution time.
Low speed coal mill wind system intelligent control module described in present embodiment and the ball mill described in embodiment two
Coal machine wind system intelligent control method is corresponding.
Specific implementation mode seven：Embodiment is described with reference to Fig. 2, and present embodiment is to the steel described in embodiment six
Ball coal pulverizer wind system intelligent control module further limits, in present embodiment, in transient state control unit, if outlet
Temperature reaches a high temperature threshold value, then Tzt=Tzt1；Otherwise, Tzt=Tzt2；Tzt1 > Tzt2.
Low speed coal mill wind system intelligent control module described in present embodiment and the ball mill described in embodiment three
Coal machine wind system intelligent control method is corresponding.
Specific implementation mode eight：Embodiment is described with reference to Fig. 2, and present embodiment is to described in embodiment five to seven
Low speed coal mill wind system intelligent control module further limit, in present embodiment, SP_P is inlet pressure setting value,
P points of inlet pressure is following four state：
Inlet pressure reaches HVT high voltage threshold：P≥SP_P+ΔP2；
Inlet pressure is higher：SP_P+ΔP2>P≥SP_P+ΔP1；Δ P2 > Δ P1,
Inlet pressure is moderate：SP_P+ΔP1>P>SP_P-ΔP1；
Inlet pressure is relatively low：P≤SP_P-ΔP1；
Δ P1 and Δ P2 is pre-set value；
SP_T is outlet temperature setting value, and T points of outlet temperature is following four state：
Outlet temperature reaches a high temperature threshold value：T≥SP_T+ΔT2；
Outlet temperature is higher：SP_T+ΔT2>T≥SP_T+ΔT1；ΔT2ΔT2ΔT1；
Outlet temperature is moderate：SP_T+ΔT1>T>SP_T-ΔT1；
Outlet temperature is relatively low：T≤SP_T-ΔT1；
The stable state control method includes with lower unit：
Outlet temperature and inlet pressure judging unit：Judge outlet according to collected Outlet Temperature value and inlet pressure level
State of temperature and inlet pressure state,
If outlet temperature state is relatively low, and inlet pressure state is relatively low, then starts and add hot air unit；
If outlet temperature state is relatively low, and inlet pressure state is moderate, then starts simultaneously and add hot air unit and subtract
Mixing wind unit；
If outlet temperature state is relatively low, and inlet pressure state is higher, then starts and subtract mixing wind unit；
If outlet temperature state is moderate, and inlet pressure state is relatively low, then starts simultaneously and add hot air unit and add
Mixing wind unit；
If outlet temperature state is moderate, and inlet pressure state is moderate, then starts AO holding units；
If outlet temperature state is moderate, and inlet pressure state is higher, then starts simultaneously and subtract hot air unit and subtract
Mixing wind unit；
If outlet temperature state is higher, and inlet pressure state is relatively low, then starts and add mixing wind unit；
If outlet temperature state is higher, and inlet pressure state is moderate, then starts simultaneously and subtract hot air unit and add
Mixing wind unit；
If outlet temperature state is higher, and inlet pressure state is higher, then starts and subtract hot air unit；
Add hot air unit：Increase hot air disperser aperture, is then back to startup sampling unit；
Subtract hot air unit：Hot air disperser aperture is reduced, startup sampling unit is then back to；
Add mixing wind unit：First increase warm throttle opening, it is rear to increase recirculation door aperture, finally increase cold-air flap aperture,
It is then back to startup sampling unit；
Subtract mixing wind unit：Cold-air flap aperture is first reduced, recirculation door aperture is then reduced, warm air door is finally reduced and opens
Degree, is then back to startup sampling unit；
AO holding units：It keeps each throttle opening constant, is then back to startup sampling unit.
Low speed coal mill wind system intelligent control module described in present embodiment and the ball mill described in embodiment four
Coal machine wind system intelligent control method is corresponding.
Claims (6)
1. low speed coal mill wind system intelligent control method, includes the following steps：
Control mode judgment step：When inlet pressure reaches HVT high voltage threshold or outlet temperature reach a high temperature threshold value when, execute
Transient state rate-determining steps；Otherwise, stable state rate-determining steps are executed；
The transient state rate-determining steps are：Hot air disperser and warm air door are controlled using PID controller, are then back to execution sampling step；
Stable state rate-determining steps：Using fuzzy control method control hot air disperser, warm air door, recirculation door and cold-air flap, then return
Receipt row sampling step；It is characterized in that, the transient state rate-determining steps are specially：
When inlet pressure reaches HVT high voltage threshold, warm throttle opening output valve AO_wfm=AO_wfm_1+du_wfm+ à wfm are pressed
Warm air door is controlled according to the temperature throttle opening output valve AO_wfm, and continuously performs Tzt controlling cycle；
When outlet temperature reaches a high temperature threshold value, hot air disperser aperture output valve AO_rfm=AO_rfm_1+du_rfm+ à rfm are pressed
Hot air disperser is controlled according to hot air disperser aperture output valve AO_rfm, and continuously performs Tzt controlling cycle；
Wherein, AO_rfm_1 and AO_wfm_1 is respectively the aperture control output of previous controlling cycle hot air disperser and warm air door
Value；
Du_rfm and du_wfm is respectively the increment of the aperture control output valve of this controlling cycle hot air disperser and warm air door；àrfm,à
Wfm is respectively the feedforward amount of the aperture control output valve of this controlling cycle hot air disperser, warm air door；
Tzt is that transient process control continues the execution time.
2. low speed coal mill wind system intelligent control method according to claim 1, which is characterized in that control and walk in transient state
In rapid, the threshold value if outlet temperature reaches a high temperature, Tzt=Tzt1；Otherwise, Tzt=Tzt2；Tzt1 > Tzt2.
3. low speed coal mill wind system intelligent control method according to claim 1 or 2, which is characterized in that
SP_P is inlet pressure setting value, and P points of inlet pressure is following four state：
Inlet pressure reaches HVT high voltage threshold：P≥SP_P+ΔP2；
Inlet pressure is higher：SP_P+ΔP2>P≥SP_P+ΔP1；Δ P2 > Δ P1,
Inlet pressure is moderate：SP_P+ΔP1>P>SP_P-ΔP1；
Inlet pressure is relatively low：P≤SP_P-ΔP1；
Δ P1 and Δ P2 is pre-set value；
SP_T is outlet temperature setting value, and T points of outlet temperature is following four state：
Outlet temperature reaches a high temperature threshold value：T≥SP_T+ΔT2；
Outlet temperature is higher：SP_T+ΔT2>T≥SP_T+ΔT1；Δ T2 > Δs T1；
Outlet temperature is moderate：SP_T+ΔT1>T>SP_T-ΔT1；
Outlet temperature is relatively low：T≤SP_T-ΔT1；
The stable state rate-determining steps include the following steps：
Outlet temperature and inlet pressure judgment step：Judge outlet temperature according to collected Outlet Temperature value and inlet pressure level
State and inlet pressure state,
If outlet temperature state is relatively low, and inlet pressure state is relatively low, then executes heating wind step；
If outlet temperature state is relatively low, and inlet pressure state is moderate, then is performed simultaneously heating wind step and subtracts mixing
Wind step；
If outlet temperature state is relatively low, and inlet pressure state is higher, then executes and subtract mixing wind step；
If outlet temperature state is moderate, and inlet pressure state is relatively low, then is performed simultaneously heating wind step and plus mixing
Wind step；
If outlet temperature state is moderate, and inlet pressure state is moderate, then executes AO and keep step；
If outlet temperature state is moderate, and inlet pressure state is higher, then is performed simultaneously reduction of heat wind step and subtracts mixing
Wind step；
If outlet temperature state is higher, and inlet pressure state is relatively low, then executes and add mixing wind step；
If outlet temperature state is higher, and inlet pressure state is moderate, then is performed simultaneously reduction of heat wind step and plus mixing
Wind step；
If outlet temperature state is higher, and inlet pressure state is higher, then executes reduction of heat wind step；
Heat wind step：Increase hot air disperser aperture, is then back to execution sampling step；
Reduction of heat wind step：Hot air disperser aperture is reduced, execution sampling step is then back to；
Add mixing wind step：First increase warm throttle opening, it is rear to increase recirculation door aperture, finally increase cold-air flap aperture, then
It returns and executes sampling step；
Subtract mixing wind step：Cold-air flap aperture is first reduced, recirculation door aperture is then reduced, finally reduces warm throttle opening, so
It returns afterwards and executes sampling step；
AO keeps step：It keeps each throttle opening constant, is then back to execution sampling step.
4. low speed coal mill wind system intelligent control module, including with lower unit：
Sampling unit：Acquire the inlet pressure level and Outlet Temperature value of low speed coal mill；
Control mode judging unit：When inlet pressure reaches HVT high voltage threshold or outlet temperature reach a high temperature threshold value when, start
Transient state control unit；Otherwise, start stable state control unit；
Transient state control unit：Hot air disperser and warm air door are controlled using PID controller, are then back to startup sampling unit；
Stable state control unit：Using fuzzy control technology control hot air disperser, warm air door, recirculation door and cold-air flap, then return
It returns and starts sampling unit；It is characterized in that, the transient state control unit is specially：
When inlet pressure reaches HVT high voltage threshold, warm throttle opening output valve AO_wfm=AO_wfm_1+du_wfm+ à wfm are pressed
Warm air door is controlled according to the temperature throttle opening output valve AO_wfm, and continuously performs Tzt controlling cycle；
When outlet temperature reaches a high temperature threshold value, hot air disperser aperture output valve AO_rfm=AO_rfm_1+du_rfm+ à rfm are pressed
Hot air disperser is controlled according to hot air disperser aperture output valve AO_rfm, and continuously performs Tzt controlling cycle；
Wherein, AO_rfm_1 and AO_wfm_1 is respectively the aperture control output of previous controlling cycle hot air disperser and warm air door
Value；
Du_rfm and du_wfm is respectively the increment of the aperture control output valve of this controlling cycle hot air disperser and warm air door；àrfm,à
Wfm is respectively the feedforward amount of the aperture control output valve of this controlling cycle hot air disperser, warm air door；
Tzt is that transient process control continues the execution time.
5. low speed coal mill wind system intelligent control module according to claim 4, which is characterized in that controlled in transient state single
In member, the threshold value if outlet temperature reaches a high temperature, Tzt=Tzt1；Otherwise, Tzt=Tzt2；Tzt1 > Tzt2.
6. low speed coal mill wind system intelligent control module according to claim 4 or 5, which is characterized in that
SP_P is inlet pressure setting value, and P points of inlet pressure is following four state：
Inlet pressure reaches HVT high voltage threshold：P≥SP_P+ΔP2；
Inlet pressure is higher：SP_P+ΔP2>P≥SP_P+ΔP1；Δ P2 > Δ P1,
Inlet pressure is moderate：SP_P+ΔP1>P>SP_P-ΔP1；
Inlet pressure is relatively low：P≤SP_P-ΔP1；
Δ P1 and Δ P2 is pre-set value；
SP_T is outlet temperature setting value, and T points of outlet temperature is following four state：
Outlet temperature reaches a high temperature threshold value：T≥SP_T+ΔT2；
Outlet temperature is higher：SP_T+ΔT2>T≥SP_T+ΔT1；Δ T2 > Δs T1；
Outlet temperature is moderate：SP_T+ΔT1>T>SP_T-ΔT1；
Outlet temperature is relatively low：T≤SP_T-ΔT1；
The stable state control unit includes with lower unit：
Outlet temperature and inlet pressure judging unit：Judge outlet temperature according to collected Outlet Temperature value and inlet pressure level
State and inlet pressure state,
If outlet temperature state is relatively low, and inlet pressure state is relatively low, then starts and add hot air unit；
If outlet temperature state is relatively low, and inlet pressure state is moderate, then starts simultaneously and add hot air unit and subtract mixing
Wind unit；
If outlet temperature state is relatively low, and inlet pressure state is higher, then starts and subtract mixing wind unit；
If outlet temperature state is moderate, and inlet pressure state is relatively low, then starts simultaneously and add hot air unit and plus mixing
Wind unit；
If outlet temperature state is moderate, and inlet pressure state is moderate, then starts AO holding units；
If outlet temperature state is moderate, and inlet pressure state is higher, then starts simultaneously and subtract hot air unit and subtract mixing
Wind unit；
If outlet temperature state is higher, and inlet pressure state is relatively low, then starts and add mixing wind unit；
If outlet temperature state is higher, and inlet pressure state is moderate, then starts simultaneously and subtract hot air unit and plus mixing
Wind unit；
If outlet temperature state is higher, and inlet pressure state is higher, then starts and subtract hot air unit；
Add hot air unit：Increase hot air disperser aperture, is then back to startup sampling unit；
Subtract hot air unit：Hot air disperser aperture is reduced, startup sampling unit is then back to；
Add mixing wind unit：First increase warm throttle opening, it is rear to increase recirculation door aperture, finally increase cold-air flap aperture, then
It returns and starts sampling unit；
Subtract mixing wind unit：Cold-air flap aperture is first reduced, recirculation door aperture is then reduced, finally reduces warm throttle opening, so
It returns afterwards and starts sampling unit；
AO holding units：It keeps each throttle opening constant, is then back to startup sampling unit.
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| CN111298327B (en) * | 2020-02-24 | 2021-01-26 | 广东电科院能源技术有限责任公司 | Coal mill fire extinguishing steam control method, system and equipment |
| CN111266182A (en) * | 2020-03-05 | 2020-06-12 | 广东电科院能源技术有限责任公司 | Coal-fired power plant coal-cut-off data analysis method and device |
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