CN109597301A - Dry coke quenching residual heat boiler Stream temperature optimal control method - Google Patents
Dry coke quenching residual heat boiler Stream temperature optimal control method Download PDFInfo
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- CN109597301A CN109597301A CN201710916756.4A CN201710916756A CN109597301A CN 109597301 A CN109597301 A CN 109597301A CN 201710916756 A CN201710916756 A CN 201710916756A CN 109597301 A CN109597301 A CN 109597301A
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- heat boiler
- coke quenching
- stream temperature
- residual heat
- dry coke
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
Abstract
The present invention relates to a kind of dry coke quenching residual heat boiler Stream temperature optimal control method, the program introduces dry coke quenching residual heat boiler entrance inert gas temperature as feedforward amount, and corrects feedforward gain COEFFICIENT K according to the variation tendency power of entrance inert gas temperature；According to the trend of the variation tendency of desuperheat water outlet temperature and the instruction variation of desuperheating water pitch, judge whether that pitch is in the discontinuous region of variation of flow, if pitch is in the insensitive region of changes in flow rate, pair adjusts the proportionality coefficient of PID and time of integration parameter adaptive to change, quickly through the insensitive region of pitch；According to the deviation of Stream temperature measured value and setting value, judge whether Stream temperature deviation is more than presetting threshold value, when Stream temperature deviation is more than threshold value and excessively high Stream temperature, locking is secondary to adjust PID feedforward numerical value to reduce, when Temperature Deviation is more than threshold value and too low Stream temperature, locking is secondary to adjust PID feedforward numerical value to increase, and only retains feedback regulation function, allows Stream temperature to return as early as possible and be stabilized to setting value.
Description
Technical field
The present invention relates to a kind of control method, in particular to dry coke quenching residual heat boiler Stream temperature variable element adaptive optimization controls
Method processed belongs to dry coke quenching cogeneration unit waste heat boiler main-stream control technical field.
Background technique
Dry coke quenching residual heat boiler absorbs red burnt heat by inert gas, transfers heat to dry coke quenching residual heat boiler and is used for
Power generation.Dry coke quenching residual heat boiler Stream temperature adjustment process is the process link typically postponed greatly, and heated object is to hold more, is big used
Property system, there are serious non-linear and time-varying characteristics for controlled system；Dry coke quenching residual heat boiler thermal change, desuperheating water pitch
Flow is non-linear etc., brings many difficulties to Stream temperature adjusting.It is wide in dry coke quenching residual heat boiler main stream temperature at present
General use by homophony, desuperheating water pitch outlet temperature of Stream temperature is the secondary cas PID control strategy adjusted, although compared to manual
Certain control effect is achieved in the control most of the time, but in dry coke quenching residual heat boiler thermal fluctuation, desuperheating water pitch
For flow discontinuously under equal complex working conditions, ideal effect is often not achieved in main-stream control, and operations staff is needed to intervene manually.
Main vapour caused by characteristic in order to overcome dry coke quenching residual heat boiler main-stream control object large time delay, time-variant nonlinear
Temperature fluctuation is larger, and Stream temperature automatic adjustment circuit long-term safety stabilization can not put into operation under relative complex operating condition, both at home and abroad
Automatic debugging efforts personnel attempt for different control methods to be introduced into main-stream control.In recent years, there is scholar to propose to be based on
The PID control of genetic algorithm and neural network, fuzzy self-adaption Predictive function control, state variable _ PREDICTIVE CONTROL, nerve immunity
The composite control methods such as feedback control obtain preferable control effect on Simulation System Platform, these researchs are for exploring
Main-stream control method under complex working condition has certain facilitation, but all there is structure is complicated, tuning method
The disadvantages of various, makes it be difficult to support in terms of obtaining effective software and hardware in practice, causes scene in practical various works
Under condition variation, it is difficult to which large-scale promotion is used.
Summary of the invention
The present invention exactly for the technical problems in the prior art, provides a kind of dry coke quenching residual heat boiler Stream temperature change
Parameter adaptive optimal control method, this method are suitable for DCS scattered control system, and the work that can reduce field operator is strong
Degree improves the regulation quality of Stream temperature, improves the economy and safety of unit operation.
To achieve the goals above, technical scheme is as follows, a kind of dry coke quenching residual heat boiler Stream temperature optimization control
Method processed, the control method are as follows:
Step 1: obtaining dry coke quenching residual heat boiler entrance inert gas temperature in real time, using numerical analysis algorithm, calculate dry coke quenching
Exhaust-heat boiler inlet inert gas temperature rise rate；
Step 2: in judgment step 1, whether dry coke quenching residual heat boiler entrance inert gas temperature rise rate is more than preset value a0, or
Person is lower than preset value a1；If it exceeds preset value a0, selects feedforward gain COEFFICIENT K max, if entrance inert gas
Temperature rise rate is lower than preset value a1, selects feedforward gain COEFFICIENT K min, otherwise selects feedforward gain COEFFICIENT K nor, finally obtains
Feedforward gain COEFFICIENT K；
Step 3: by dry coke quenching residual heat boiler entrance inert gas temperature multiplied by feedforward gain COEFFICIENT K, as the secondary feedforward for adjusting PID
Signal is added with cascade PID operation result, and collective effect is exported in the control of desuperheating water pitch;
Step 4: obtaining desuperheat water outlet temperature T and desuperheating water pitch instructs OP, using numerical analysis algorithm, calculate desuperheating water tune
When door instruction Spline smoothing, the amplitude of desuperheat water outlet temperature variation: ∣ Δ T/ Δ OP ∣；
Step 5: whether 4 Zhong ∣ Δ T/ Δ OP ∣ of judgment step is lower than preset value a2, if being lower than preset value a2, shows
In the pitch range of instructions, flow is less continuous, preferably select one group of proportionality coefficient and the time of integration biggish pid parameter (Kp1,
Ki1), quickly through the insensitive region of pitch flow；Ru Guo ∣ Δ T/ Δ OP ∣ is higher than preset value a2, shows that the pitch instructs
In range, flow is more continuous, preferably selects one group of proportionality coefficient and the time of integration relatively small pid parameter (Kp2, Ki2)；
Step 6: the measured value of Stream temperature is PV, and the setting value of Stream temperature degree is SP, and whether Pan Duan ∣ PV-SP ∣ is greater than a3；Ru Guo ∣
PV-SP ∣ >=a3 and PV are greater than SP, indicate that Stream temperature is higher at this time, correspondingly the secondary reduction for adjusting PID feedforward amount of locking；Ru Guo ∣
PV-SP ∣ >=a3 and PV are less than SP, indicate that Stream temperature is lower at this time, correspondingly the secondary increase for adjusting PID feedforward amount of locking.
As an improvement of the present invention, in the step 1, the inert gas temperature rise of dry coke quenching residual heat boiler entrance is calculated
Rate is the data variation rate in one minute.
As an improvement of the present invention, in the step 2, a0=2, a1=0.5, dry coke quenching residual heat boiler entrance indifferent gas
The gain coefficient K variation range of temperature feedforward is [0.1,0.2]；Dry coke quenching residual heat boiler entrance inert gas temperature rise rate is greater than
When 2, K=Kmax=0.2, when dry coke quenching residual heat boiler entrance inert gas temperature rise rate is less than 0.5, K=Kmin=0.1, otherwise K=
Knor=0.15。
As an improvement of the present invention, in the step 5, typical steady working condition is chosen, desuperheating water pitch aperture refers to
Enabling Δ OP Spline smoothing step-length is 5, and the amplitude of desuperheat water outlet temperature step response variation is calculated.A2 is 20 Zus of ∣ Δ T/
The average value of Δ OP ∣ numerical value, if the value of a certain Zu of ∣ Δ T/ Δ OP ∣ is lower than a2, judges the pitch range of instructions multiplied by 0.85
Interior, flow is less continuous, bunch grade adjustment subloop select biggish proportionality coefficient and the time of integration biggish pid parameter (Kp1,
Ki1), another group of pid parameter (Kp2, Ki2) is otherwise selected；Kp1 numerical value may be selected to be 1.5-2 times of Kp2, and Ki1 numerical value is optional
It is selected as 2-3 times of Ki2.
As an improvement of the present invention, in the step 6, setting a3=5 are closed when Stream temperature is more than 5 degree of setting value
The secondary reduction for adjusting PID feedforward amount of lock, prevents feedforward action from reducing and closing pitch, Stream temperature is caused further to increase；When main vapour
When temperature is lower than 5 degree of setting value, it is latched the secondary increase for adjusting PID feedforward amount, prevents feedforward action from increasing and opening pitch, leads to main vapour
Temperature further decreases.
Compared with the existing technology, the invention has the advantages that, the technical solution is in view of red burnt and cryogenic inert gas
Etc. factors variation influence exhaust-heat boiler inlet inert gas temperature, finally Stream temperature is influenced, in Stream temperature regulating loop
Dry coke quenching residual heat boiler entrance inert gas temperature is introduced as feed-forward signal, and adaptive strain has been carried out to feedforward gain and has been joined
Number processing, while increasing the feedforward term direction locking of desuperheating water pitch flow discontinuously adaptive strain parameter and PID regulator
Function is effectively reduced the working strength of field operator, improves the regulation quality of Stream temperature, improves the economy of unit operation
Property and safety, meeting dry coke quenching residual heat boiler Stream temperature automatic adjustment circuit can pacify for a long time under relative complex operating condition
The full demand for stablizing the operation that puts into operation.
Detailed description of the invention
Fig. 1 is main-stream control schematic illustration；
Fig. 2 is using Stream temperature change histories tendency chart before optimal control method；
Fig. 3 is using Stream temperature change histories tendency chart after optimal control method.
Specific embodiment:
In order to deepen the understanding of the present invention, the present embodiment is described in detail with reference to the accompanying drawing.
Embodiment 1: referring to figures 1-3, a kind of dry coke quenching residual heat boiler Stream temperature optimal control method, the control method
It is as follows,
Step 1: obtaining end in real time and obtain dry coke quenching residual heat boiler entrance inert gas temperature, using numerical analysis algorithm, calculate
Dry coke quenching residual heat boiler entrance inert gas temperature rise rate；
Step 2: in judgment step 1, whether dry coke quenching residual heat boiler entrance inert gas temperature rise rate is more than preset value a0, or
Person is lower than preset value a1；If it exceeds preset value a0, selects feedforward gain COEFFICIENT K max, if entrance inert gas
Temperature rise rate is lower than preset value a1, selects feedforward gain COEFFICIENT K min, otherwise selects feedforward gain COEFFICIENT K nor, finally obtains
Feedforward gain COEFFICIENT K；
Step 3: as Fig. 1 adjusts PID as pair by dry coke quenching residual heat boiler entrance inert gas temperature multiplied by feedforward gain COEFFICIENT K
Feed-forward signal, be added with cascade PID operation result, collective effect in desuperheating water pitch control export；
Step 4: obtaining desuperheat water outlet temperature T and desuperheating water pitch instructs OP, using numerical analysis algorithm, calculate desuperheating water tune
When door instruction Spline smoothing, the amplitude of desuperheat water outlet temperature variation: ∣ Δ T/ Δ OP ∣；
Step 5: whether 4 Zhong ∣ Δ T/ Δ OP ∣ of judgment step is lower than preset value a2, if being lower than preset value a2, shows
In the pitch range of instructions, attemperation water flow is less continuous, preferably selects one group of proportionality coefficient and the time of integration biggish pid parameter
(Kp1, Ki1), quickly through the insensitive region of pitch flow；Ru Guo ∣ Δ T/ Δ OP ∣ is higher than preset value a2, shows the tune
In door range of instructions, attemperation water flow is more continuous, preferably selects one group of proportionality coefficient and the time of integration relatively small pid parameter
(Kp2, Ki2)；
Step 6: the measured value of Stream temperature is PV, and the setting value of Stream temperature degree is SP, and whether Pan Duan ∣ PV-SP ∣ is greater than a3.Ru Guo ∣
PV-SP ∣ >=a3 and PV are greater than SP, indicate that Stream temperature is higher at this time, correspondingly the secondary reduction for adjusting PID feedforward amount of locking；Ru Guo ∣
PV-SP ∣ >=a3 and PV are less than SP, indicate that Stream temperature is lower at this time, correspondingly the secondary increase for adjusting PID feedforward amount of locking；
In step 1, dry coke quenching residual heat boiler entrance inert gas temperature rise rate is calculated, is the data variation rate in one minute.
In step 2, the gain coefficient K of a0=2, a1=0.5, the feedforward of dry coke quenching residual heat boiler entrance inert gas temperature become
Changing range is [0.1,0.2].When dry coke quenching residual heat boiler entrance inert gas temperature rise rate is greater than 2, K=Kmax=0.2, more than dry coke quenching
When heat boiler entrance inert gas temperature rise rate is less than 0.5, K=Kmin=0.1, otherwise K=Knor=0.15.
In steps of 5, typical steady working condition is chosen, desuperheating water pitch opening degree instruction Δ OP Spline smoothing step-length is 5, meter
It calculates and obtains the amplitude of desuperheat water outlet temperature step response variation.A2 be 20 Zus of ∣ Δ T/ Δ OP ∣ numerical value average value multiplied by
0.85.If the value of a certain Zu of ∣ Δ T/ Δ OP ∣ is lower than a2, judge in the pitch range of instructions, flow is less continuous, tandem tune
It saves subloop and selects biggish proportionality coefficient and the time of integration biggish pid parameter (Kp1, Ki1), otherwise select another group of PID
Parameter (Kp2, Ki2).Kp1 numerical value may be selected to be 1.5-2 times of Kp2, and Ki1 numerical value may be selected to be 2-3 times of Ki2.
In step 6, a3=5 are set, when Stream temperature is more than 5 degree of setting value, the secondary reduction for adjusting PID feedforward amount is latched, prevents
Only feedforward action reduces and closes pitch, and Stream temperature is caused further to increase；When Stream temperature is lower than 5 degree of setting value, locking is secondary
The increase for adjusting PID feedforward amount prevents feedforward action from increasing and opening pitch, Stream temperature is caused to further decrease.
Fig. 2 and Fig. 3 is using the history graphs of 12 hours before and after this patent, and operating condition is substantially close,
In Fig. 2, the numerical value of Stream temperature changes between [428.5213,451.8142], average value 439.5579, and mean square deviation is
3.8071, intermediate repeatedly to cut manually, the fluctuation of Stream temperature degree is big；
Referring to Fig. 3, the numerical value of Stream temperature changes between [438.1603,449.2659], average value 445.0127, just
Difference is 1.53272, and centre is not cut manually, and the fluctuation of Stream temperature degree is small.By being carried out to the history curve data in Fig. 2 and Fig. 3
It analyzes, after the optimal control method using this invention, the fluctuating range of Stream temperature is obviously reduced, and without there is excision certainly
Dynamic situation occurs, and Stream temperature degree average value improves 5 degree or more, has when self-regulation effect is not than using of the invention larger
Improvement.
It should be noted that above-described embodiment, is not intended to limit the scope of protection of the present invention, in above-mentioned technical proposal
On the basis of made equivalents or substitution each fall within the range that the claims in the present invention are protected.
Claims (5)
1. a kind of dry coke quenching residual heat boiler Stream temperature optimal control method, which is characterized in that the control method is as follows:
Step 1: obtaining dry coke quenching residual heat boiler entrance inert gas temperature in real time, using numerical analysis algorithm, calculate dry coke quenching
Exhaust-heat boiler inlet inert gas temperature rise rate；
Step 2: in judgment step 1, whether dry coke quenching residual heat boiler entrance inert gas temperature rise rate is more than preset value a0, or
Person is lower than preset value a1；If it exceeds preset value a0, selects feedforward gain COEFFICIENT K max, if entrance inert gas
Temperature rise rate is lower than preset value a1, selects feedforward gain COEFFICIENT K min, otherwise selects feedforward gain COEFFICIENT K nor, finally obtains
Feedforward gain COEFFICIENT K；
Step 3: by dry coke quenching residual heat boiler entrance inert gas temperature multiplied by feedforward gain COEFFICIENT K, as the secondary feedforward for adjusting PID
Signal is added with cascade PID operation result, and collective effect is exported in the control of desuperheating water pitch；
Step 4: obtaining desuperheat water outlet temperature T and desuperheating water pitch instructs OP, using numerical analysis algorithm, calculate desuperheating water tune
When door instruction Spline smoothing, the amplitude of desuperheat water outlet temperature variation: ∣ Δ T/ Δ OP ∣；
Step 5: whether 4 Zhong ∣ Δ T/ Δ OP ∣ of judgment step is lower than preset value a2, if being lower than preset value a2, shows
In the pitch range of instructions, flow is less continuous, preferably select one group of proportionality coefficient and the time of integration biggish pid parameter (Kp1,
Ki1), quickly through the insensitive region of pitch flow；Ru Guo ∣ Δ T/ Δ OP ∣ is higher than preset value a2, shows that the pitch instructs
In range, flow flow is more continuous, preferably select one group of proportionality coefficient and the time of integration relatively small pid parameter (Kp2,
Ki2)；
Step 6: the measured value of Stream temperature is PV, and the setting value of Stream temperature degree is SP, and whether Pan Duan ∣ PV-SP ∣ is greater than a3；Ru Guo ∣
PV-SP ∣ >=a3 and PV are greater than SP, indicate that Stream temperature is higher at this time, correspondingly the secondary reduction for adjusting PID feedforward amount of locking；Ru Guo ∣
PV-SP ∣ >=a3 and PV are less than SP, indicate that Stream temperature is lower at this time, correspondingly the secondary increase for adjusting PID feedforward amount of locking.
2. dry coke quenching residual heat boiler Stream temperature optimal control method according to claim 1, which is characterized in that the step
In 1,
Dry coke quenching residual heat boiler entrance inert gas temperature rise rate is calculated, is the data variation rate in one minute.
3. dry coke quenching residual heat boiler Stream temperature optimal control method according to claim 2, which is characterized in that the step
In 2, a0=2, a1=0.5, dry coke quenching residual heat boiler entrance inert gas temperature feedforward gain coefficient K variation range be [0.1,
0.2]；When dry coke quenching residual heat boiler entrance inert gas temperature rise rate is greater than 2, K=Kmax=0.2, dry coke quenching residual heat boiler entrance is lazy
When property gas temperature rise rate is less than 0.5, K=Kmin=0.1, otherwise K=Knor=0.15.
4. dry coke quenching residual heat boiler Stream temperature optimal control method according to claim 3, which is characterized in that the step
In 5, a2 is the average value of 20 Zus of ∣ Δ T/ Δ OP ∣ numerical value multiplied by 0.85, if the value of a certain Zu of ∣ Δ T/ Δ OP ∣ is lower than a2, is sentenced
Break in the pitch range of instructions, flow is less continuous, bunch grade adjustment subloop select biggish proportionality coefficient and the time of integration compared with
Big pid parameter (Kp1, Ki1) otherwise selects another group of pid parameter (Kp2, Ki2)；Kp1 numerical value may be selected to be the 1.5-of Kp2
2 times, Ki1 numerical value may be selected to be 2-3 times of Ki2.
5. dry coke quenching residual heat boiler Stream temperature optimal control method according to claim 4, which is characterized in that the step
In 6, a3=5 are set, when Stream temperature is more than 5 degree of setting value, the secondary reduction for adjusting PID feedforward amount is latched, prevents feedforward action from reducing
And pitch is closed, cause Stream temperature further to increase；When Stream temperature is lower than 5 degree of setting value, it is latched the secondary increasing for adjusting PID feedforward amount
Add, prevents feedforward action from increasing and opening pitch, Stream temperature is caused to further decrease.
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