CN103412479B - Paired running oxygen-eliminating device intelligent control method - Google Patents
Paired running oxygen-eliminating device intelligent control method Download PDFInfo
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- CN103412479B CN103412479B CN201310366992.5A CN201310366992A CN103412479B CN 103412479 B CN103412479 B CN 103412479B CN 201310366992 A CN201310366992 A CN 201310366992A CN 103412479 B CN103412479 B CN 103412479B
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Abstract
Paired running oxygen-eliminating device intelligent control method, the present invention relates to the control method of oxygen-eliminating device.It solve the problem that oxygen-eliminating device system is difficult to when there is disturbance realize automatically controlling.The concrete condition that the present invention runs according to deaerators in parallel, is divided into Steady state and transient state by its adjustment process, adopts fuzzy control technology during stable state, adopts PID control technology during transient state.When final output calculates, in conjunction with each deaerator level deviation situation, the intake gate aperture of selective control oxygen-eliminating device.The judgement of transient state process is as follows: boiler load is in significantly in Rapid Variable Design process; Each deaerator level deviation is excessive; The change of oxygen-eliminating device initial steam pressure is excessive; Hydrophobic female pipe pressure of supply water change is excessive; Owing to have employed the control technology that transient state and stable state are separated, both ensure that the corresponding fast of time of crisis, achieved again the steady adjustment under stable case, and reduced valve event frequency, extend the serviceable life of valve.
Description
Technical field
The present invention relates to the control method of oxygen-eliminating device.
Background technology
Oxygen-eliminating device is the important utility appliance in firepower plant heating system, the condensate water being used for Steam Turbine to produce, chemistry filled water and other hydrophobicly to collect, heating also except the oxygen in anhydrating, prevents the oxygen corrosion of therrmodynamic system pipe-line equipment.In cogeneration plant, usually there are two and above oxygen-eliminating device paired running.As shown in Figure 1, during more than two oxygen-eliminating device 4 paired runnings, bottom water delivering orifice is linked together by water balance pipe, and top water inlet and air intake use valve regulated respectively.Change inflow or the throttle flow of an oxygen-eliminating device, not only affect water level and the pressure of this TV station oxygen-eliminating device, also can cause disturbance to the water level of other oxygen-eliminating device and pressure.Particularly when boiler load changes, operations staff must regulate inflow and the throttle flow of each oxygen-eliminating device quickly and accurately, could maintain pressure and the water level balance of oxygen-eliminating device, guarantee deaerating effect and security of operation.Operative is frequent, and labour intensity is large, and spiritual high concentration, careless slightly, be easy to oxygen-eliminating device full water accident occurs or deoxygenation index defective, jeopardize the security of operation of whole power plant.Oxygen-eliminating device runs to be implemented automatically to control to be the unique effective means solved the problem.
But, there is multiple random perturbation when oxygen-eliminating device runs, as initial steam pressure disturbance, hydrophobic main-piping pressure disturbance and boiler load disturbance etc., also by internal pressure disturbance each other between each oxygen-eliminating device.Oxygen-eliminating device itself also also exists the problems such as regulating cycle is long, inertia is large.Therefore, deaerators in parallel system is the complication system of a typical strong coupling, non-linear, variable element, large time delay, is difficult to realize automatic control.The particularly conventional DCS Combining soft control method of widespread use at present, after the application of such oxygen-eliminating device, deaerator level regulates and does not catch up with, and not being " excessively slow ", is exactly " too fast "." if excessively slow ", when boiler load shedding, deaerator level is too high, and deoxygenation index is defective, easily produces full water blowing out accident; When boiler increases load, deaerator level is too low, and feed pump cavitation accident easily occurs." if too fast ", then easily cause deaerator level overshoot, water level " pressure shaddock " phenomenon between each oxygen-eliminating device, a deaerator level is very low, and another is but very high, and height rises and falls each other, the security of operation of serious threat unit.In addition, regulate " too fast " also can cause serious harm to control valve, reduce the serviceable life of valve, what have must keep in repair or change less than one month, affected the long-term operation of unit.Therefore, in the urgent need to research and development new technology, the automatic control problem of such oxygen-eliminating device system is solved.
Summary of the invention
The object of this invention is to provide a kind of paired running oxygen-eliminating device intelligent control method, to solve the problem that oxygen-eliminating device system is difficult to when there is disturbance realize automatically controlling.Method of the present invention comprises the steps: one, opens this control sampling period; Two, judge whether the load variations from boiler 5 exceedes threshold value, if "Yes", then the feedforward compensation of operating procedure three, the control output using boiler load signal x as water valve aperture; The transient state control time Tzt=4Ti of feedforward compensation, then enters step 10; If the result of step 2 is "No", then operating procedure four, judge that the pressure change Tb from the female pipe 2 of air feed exceedes threshold value? if "Yes", then operating procedure five, the feedforward compensation that exports using vapor pressure signal as steam-valving control; The transient state control time Tzt=8Ti of feedforward compensation, then enters step 10; If the result of step 4 is "No", then operating procedure six, judge from hydrophobic female pipe 3 pressure change exceed threshold value? if "Yes", then operating procedure seven, hydrophobic female pipe 3 pressure signal control the feedforward compensation of output as water valve aperture; The transient state control time Tzt=8Ti of feedforward compensation is set, then enters step 10; If the result of step 6 is "No", then operating procedure eight, judge that between each oxygen-eliminating device 4, water-head exceedes threshold value? if "Yes", then operating procedure nine, enter transient state control, transient state control time Tzt=8Ti, then enters step 10; The result of step 8 is "No", then enter step 10, judge whether transient state control time Tzt is 0; The result of step 10 is "Yes", then enter step 11, oxygen-eliminating device 4 adopts fuzzy control to calculate, and obtains the controlling increment du_qm of porthole and the controlling increment du_sm of water valve; The result of step 10 is "No", then enter step 12, oxygen-eliminating device adopts PID controlling calculation, obtain the controlling increment du_qm of porthole and the controlling increment du_sm of water valve, and deduct 1 unit interval to the transient state control time; All enter step 13 after step 11 or step 12 terminate, calculate the intake gate 1-1 of each oxygen-eliminating device 4 and admission door 2-1 control output quantity and complete corresponding control operation, computation process is specially: steps A, search oxygen-eliminating device 4 middle water level soprano and the lowest, correspondingly counts AO_h and AO_L; If du_sm>0, then give oxygen-eliminating device 4 middle water level the lowest AO_L moisturizing, rate of water make-up is AO_L+du_sm; Other intake gate 1-1 does not regulate; If du_sm<0, then give oxygen-eliminating device 4 middle water level soprano AO_h diminishing, diminishing amount is AO_h+du_sm; Other intake gate 1-1 does not regulate; Step B, each oxygen-eliminating device admission door 2-1 aperture output quantity are AO [i]+du_qm, AO [i] is this oxygen-eliminating device aperture; Execution step 14, this control sampling period terminate, and return step one.
Oxygen-eliminating device 4 control method of prior art generally adopts single loop PID control strategy, because of can not stable operation and cannot putting into operation, and can only by regulating manually.The inventive method contains all problems solving during prior art oxygen-eliminating device runs and run into, and for these problems, provide decision logic and control program respectively, effectively overcome oxygen-eliminating device and run the various disturbing factors in automatically controlling, achieve the automatic operation of paired running oxygen-eliminating device system long-term stability.Owing to have employed the control technology that transient state and stable state are separated, both ensure that the corresponding fast of time of crisis, achieved again the steady adjustment under stable case, and reduced valve event frequency, extend the serviceable life of valve.
Accompanying drawing explanation
Fig. 1 is the structural representation of paired running oxygen-eliminating device, and Fig. 2 is the schematic flow sheet of control method of the present invention, and Fig. 3 is that deaerator level controls schematic diagram, and Fig. 4 is oxygen-eliminating device Stress control schematic diagram.
Embodiment
Embodiment one: illustrate present embodiment below in conjunction with Fig. 1 to Fig. 4.Present embodiment comprises the steps: one, opens this control sampling period; Two, judge whether the load variations from boiler 5 exceedes threshold value, if "Yes", then the feedforward compensation of operating procedure three, the control output using boiler load signal x as water valve aperture; The transient state control time Tzt=4Ti of feedforward compensation, then enters step 10; If the result of step 2 is "No", then operating procedure four, judge that the pressure change Tb from the female pipe 2 of air feed exceedes threshold value? if "Yes", then operating procedure five, the feedforward compensation that exports using vapor pressure signal as steam-valving control; The transient state control time Tzt=8Ti of feedforward compensation, then enters step 10; If the result of step 4 is "No", then operating procedure six, judge from hydrophobic female pipe 3 pressure change exceed threshold value? if "Yes", then operating procedure seven, hydrophobic female pipe 3 pressure signal control the feedforward compensation of output as water valve aperture; The transient state control time Tzt=8Ti of feedforward compensation is set, then enters step 10; If the result of step 6 is "No", then operating procedure eight, judge that between each oxygen-eliminating device 4, water-head exceedes threshold value? if "Yes", then operating procedure nine, enter transient state control, transient state control time Tzt=8Ti, then enters step 10; The result of step 8 is "No", then enter step 10, judge whether transient state control time Tzt is 0; The result of step 10 is "Yes", then enter step 11, oxygen-eliminating device 4 adopts fuzzy (Fuzzy) controlling calculation, regulate at a slow speed.Obtain the controlling increment du_qm of porthole and the controlling increment du_sm of water valve; The result of step 10 is "No", then enter step 12, oxygen-eliminating device adopts PID controlling calculation, carry out quick adjustment.Obtain the controlling increment du_qm of porthole and the controlling increment du_sm of water valve, and 1 unit interval is deducted to the transient state control time; All enter step 13 after step 11 or step 12 terminate, calculate the intake gate 1-1 of each oxygen-eliminating device 4 and admission door 2-1 control output quantity and complete corresponding control operation, computation process is specially: steps A, search oxygen-eliminating device 4 middle water level soprano and the lowest, correspondingly counts AO_h and AO_L; If du_sm>0, then give oxygen-eliminating device 4 middle water level the lowest AO_L moisturizing, rate of water make-up is AO_L+du_sm; Other intake gate 1-1 does not regulate; If du_sm<0, then give oxygen-eliminating device 4 middle water level soprano AO_h diminishing, diminishing amount is AO_h+du_sm; Other intake gate 1-1 does not regulate; Step B, each oxygen-eliminating device admission door 2-1 aperture output quantity are AO [i]+du_qm, AO [i] is this oxygen-eliminating device aperture; Execution step 14, this control sampling period terminate, and return step one.
In present embodiment step one, the time span in sampling period is 1 second; Ti in step 3, five, seven and nine is 50 seconds; Unit interval in step 12 was 1 second.
The concrete condition that the present invention runs according to deaerators in parallel, is divided into Steady state and transient state by its adjustment process, adopts fuzzy control technology during stable state, adopts PID control technology during transient state.When final output calculates, in conjunction with each deaerator level deviation situation, the intake gate aperture of selective control oxygen-eliminating device.
The judgement of transient state process is as follows:
(1) boiler load is in significantly in Rapid Variable Design process;
(2) each deaerator level deviation is excessive;
(3) change of oxygen-eliminating device initial steam pressure is excessive;
(4) hydrophobic female pipe pressure of supply water change is excessive;
Whether the above-mentioned state of control program real-time judge occurs, once occur, regulating system proceeds to transient state process immediately and controls, and extends execution a period of time.After transient state process control terminates, namely regulating system proceeds to steady-state process and controls.
Ti is the integration time constant of PID controller, and unit is second.
Embodiment two: illustrate present embodiment below in conjunction with Fig. 1.The difference part of present embodiment and embodiment one is the boiler load signal x of step 3 is 0.015 times that boiler water flow changes, and in step 7, hydrophobic female pipe 3 pressure signal is 120 times of the change of hydrophobic female pipe 3 pressure.Other is identical with embodiment one.
Embodiment three: illustrate present embodiment below in conjunction with Fig. 1.The difference part of present embodiment and embodiment one is that in step 5, vapor pressure signal is 150 times of the changing value of air intake opening 2 supply gas pressure.Other is identical with embodiment one.
Embodiment four: illustrate present embodiment below in conjunction with Fig. 1.The difference part of present embodiment and embodiment one is the threshold value of step 2 is per minute 5%.Other is identical with embodiment one.
Embodiment five: illustrate present embodiment below in conjunction with Fig. 1.The difference part of present embodiment and embodiment one is the threshold value of step 4 is 0.1Mpa per minute.Other is identical with embodiment one.
Embodiment six: illustrate present embodiment below in conjunction with Fig. 1.The difference part of present embodiment and embodiment one is the threshold value 0.1Mpa per minute of step 6.Other is identical with embodiment one.
Embodiment seven: illustrate present embodiment below in conjunction with Fig. 1.The difference part of present embodiment and embodiment one is the threshold value 50mm of step 8.Other is identical with embodiment one.
Claims (8)
1. paired running oxygen-eliminating device intelligent control method, is characterized in that it comprises the steps: one, opens this control sampling period; Two, judge whether the load variations from boiler (5) exceedes threshold value, if "Yes", then the feedforward compensation of operating procedure three, the control output using boiler load signal x as water valve aperture; The transient state control time Tzt=4Ti of feedforward compensation, then enters step 10; If the result of step 2 is "No", then operating procedure four, judge from air feed mother pipe (2) pressure change Tb whether exceed threshold value, if "Yes", then operating procedure five, the feedforward compensation that exports using vapor pressure signal as steam-valving control; The transient state control time Tzt=8Ti of feedforward compensation, then enters step 10; If the result of step 4 is "No", then operating procedure six, judge from hydrophobic mother pipe (3) pressure change whether exceed threshold value, if "Yes", then operating procedure seven, hydrophobic mother manage the feedforward compensation that (3) pressure signal controls as water valve aperture to export; The transient state control time Tzt=8Ti of feedforward compensation is set, then enters step 10; If the result of step 6 is "No", then operating procedure eight, judge between each oxygen-eliminating device (4), whether water-head exceedes threshold value, if "Yes", then operating procedure nine, enter transient state control, transient state control time Tzt=8Ti, then enters step 10; The result of step 8 is "No", then enter step 10, judge whether transient state control time Tzt is 0; The result of step 10 is "Yes", then enter step 11, oxygen-eliminating device (4) employing fuzzy control calculates, obtain the controlling increment du_qm of porthole and the controlling increment du_sm of water valve; The result of step 10 is "No", then enter step 12, oxygen-eliminating device adopts PID controlling calculation, obtain the controlling increment du_qm of porthole and the controlling increment du_sm of water valve, and deduct 1 unit interval to the transient state control time; All enter step 13 after step 11 or step 12 terminate, calculate the intake gate (1-1) of each oxygen-eliminating device (4) and admission door (2-1) controls output quantity and completes corresponding control operation, computation process is specially: steps A, search oxygen-eliminating device (4) middle water level soprano and the lowest, correspondingly counts AO_h and AO_L; If du_sm>0, then give oxygen-eliminating device (4) middle water level the lowest AO_L moisturizing, rate of water make-up is AO_L+du_sm; Other intake gate (1-1) does not regulate; If du_sm<0, then give oxygen-eliminating device (4) middle water level soprano AO_h diminishing, diminishing amount is AO_h+du_sm; Other intake gate (1-1) does not regulate; Step B, each oxygen-eliminating device admission door (2-1) aperture output quantity are AO [i]+du_qm, AO [i] is this oxygen-eliminating device aperture; Execution step 14, this control sampling period terminate, and return step one;
Adopt PID controller to control when transient state controls, Ti is the integration time constant of PID controller.
2. paired running oxygen-eliminating device intelligent control method according to claim 1, is characterized in that the time span in sampling period in step one is 1 second; Ti in step 3, five, seven and nine is 50 seconds; Unit interval in step 12 was 1 second.
3. paired running oxygen-eliminating device intelligent control method according to claim 1, it is characterized in that the boiler load signal x of step 3 is 0.015 times of boiler water flow change, in step 7, hydrophobic mother's pipe (3) pressure signal is 120 times of the change of hydrophobic mother's pipe (3) pressure.
4. paired running oxygen-eliminating device intelligent control method according to claim 1, is characterized in that in step 5, vapor pressure signal is 150 times of the changing value of air feed mother pipe (2) supply gas pressure.
5. paired running oxygen-eliminating device intelligent control method according to claim 1, is characterized in that the threshold value of step 4 is 0.1Mpa per minute.
6. paired running oxygen-eliminating device intelligent control method according to claim 1, is characterized in that the threshold value of step 2 is per minute 5%.
7. paired running oxygen-eliminating device intelligent control method according to claim 1, is characterized in that the threshold value of step 6 0.1Mpa per minute.
8. paired running oxygen-eliminating device intelligent control method according to claim 1, is characterized in that the threshold value 50mm of step 8.
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| CN106678773B (en) * | 2016-12-30 | 2017-11-21 | 淮海工学院 | The control method for the thermal deaerator that fuzzy control is combined with fuzzy feedforward compensation |
| CN108062117B (en) * | 2017-12-29 | 2021-03-02 | 国电科学技术研究院 | Water level control device for parallel operation of multiple deaerators |
| CN111694380B (en) * | 2020-06-18 | 2022-09-16 | 西安热工研究院有限公司 | Efficient and energy-saving water level control method for self-adaptive deaerator |
| CN112577036B (en) * | 2020-12-11 | 2022-12-27 | 新奥数能科技有限公司 | Method and device for setting opening interval time of oxygen discharge door of boiler deaerator |
| CN112631343B (en) * | 2020-12-23 | 2022-11-29 | 浙江浙能绍兴滨海热电有限责任公司 | Method for controlling water level by parallelly operating multiple deaerators in main pipe system |
| CN113883495B (en) * | 2021-09-28 | 2023-08-04 | 北京和隆优化科技股份有限公司 | Liquid level coordination control method and system for deaerator group |
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