CN103412479A - Method for intelligently controlling deaerators which are operated in parallel - Google Patents
Method for intelligently controlling deaerators which are operated in parallel Download PDFInfo
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- CN103412479A CN103412479A CN2013103669925A CN201310366992A CN103412479A CN 103412479 A CN103412479 A CN 103412479A CN 2013103669925 A CN2013103669925 A CN 2013103669925A CN 201310366992 A CN201310366992 A CN 201310366992A CN 103412479 A CN103412479 A CN 103412479A
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Abstract
The invention provides a method for intelligently controlling deaerators which are operated in parallel, and relates to the method for controlling the deaerators. The problem that a deaerator system is difficultly automatically controlled when being disturbed is solved. The adjusting process of the method is divided into a steady state and a transient state according to the specific operating situations of the parallel deaerators, a fuzzy control technology is adopted in the steady state, and a PID control technology is adopted in the transient state. In the process of final output calculation, the aperture of water inlet doors of the deaerators is selectively adjusted by the cooperation with the water level deviation situations of the deaerators. The transient state process is judged as follows: when loads of a boiler greatly and rapidly change, the water level deviation of the deaerators is too large, the change of steam inlet pressure of the deaerators is too large, and the change of water supply pressure of a water drain main pipe is too large. Due to the adoption of the technology for controlling the transient state and the steady state to be separated, rapid response in times of crisis is guaranteed, steady adjustment under stable situations is also achieved, motion frequency of a valve is reduced, and the service life of the valve is prolonged.
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, is used for condensate water, chemistry filled water and other hydrophobic collecting that Steam Turbine is produced, heating and removing the oxygen in anhydrating, and prevents the oxygen corrosion of therrmodynamic system pipe-line equipment.In cogeneration plant, two and above oxygen-eliminating device paired running are arranged usually.As shown in Figure 1, during two above oxygen-eliminating device 4 paired runnings, the bottom water delivering orifice links together by the water balance pipe, and top water inlet and air intake are used respectively valve regulated.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 water level and the pressure of other oxygen-eliminating device.Particularly when boiler load changed, the operations staff must regulate inflow and the throttle flow of each oxygen-eliminating device quickly and accurately, just can maintain pressure and the water level balance of oxygen-eliminating device, guaranteed deaerating effect and security of operation.Workman's frequent operation, labour intensity is large, and spiritual high concentration, careless slightly, is easy to occur oxygen-eliminating device full water accident or the deoxygenation index is defective, jeopardizes the security of operation of whole power plant.It is the unique effective means addressed the above problem that the oxygen-eliminating device operation is implemented automatically to control.
But, during the oxygen-eliminating device operation, there is multiple random perturbation, as initial steam pressure disturbance, hydrophobic main-piping pressure disturbance and boiler load disturbance etc., between each oxygen-eliminating device, also be subjected to internal pressure disturbance each other.Oxygen-eliminating device itself also exists the problems such as regulating cycle is long, inertia is large.Therefore, the 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 conventional DCS configuration control method of at present widespread use particularly, after such oxygen-eliminating device application, deaerator level is regulated and is not caught up with, and is not " excessively slow ", is exactly " too fast "." if excessively slow ", when the boiler load shedding, deaerator level is too high, and the deoxygenation index is defective, easily produces full water blowing out accident; When boiler increased load, deaerator level was too low, and feed pump cavitation accident easily occurs.If " too fast ", easily cause deaerator level overshoot, phenomenon that the water level between each oxygen-eliminating device " is pressed shaddock ", 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 " and 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 the research and development new technology, solve the automatic control problem of such oxygen-eliminating device system.
Summary of the invention
The purpose of this invention is to provide a kind of paired running oxygen-eliminating device intelligent control method, when disturbance occurring, be difficult to realize to solve the oxygen-eliminating device system problem of automatically controlling.Method of the present invention comprises the steps: one, opens this control sampling period; Two, whether judgement surpasses threshold value from the load variations of boiler 5, if "Yes", operating procedure three, the boiler load signal x of usining control the feedforward compensation of output as the water valve aperture; The transient state control time Tzt=4Ti of feedforward compensation, then enter step 10; Do whether operating procedure four, judgement change Tb over threshold value from the pressure of the female pipe 2 of air feed if the result of step 2 is "No"? if "Yes", operating procedure five, the vapor pressure signal of usining are controlled the feedforward compensation of output as the porthole aperture; The transient state control time Tzt=8Ti of feedforward compensation, then enter step 10; Do operating procedure six, judgement change whether surpass threshold value from the pressure of hydrophobic female pipe 3 if the result of step 4 is "No"? if "Yes", operating procedure seven, hydrophobic female pipe 3 pressure signals are controlled the feedforward compensation of output as the 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", operating procedure eight, judge between each oxygen-eliminating device 4 whether water-head surpasses threshold value? if "Yes", operating procedure nine, enter transient state and control, transient state control time Tzt=8Ti, then enter step 10; The result of step 8 is "No", enters step 10, judges whether transient state control time Tzt is 0; The result of step 10 is "Yes", enters step 11, oxygen-eliminating device 4 employing fuzzy controls calculating, obtains the controlling increment du_qm of porthole and the controlling increment du_sm of water valve; The result of step 10 is "No", enters step 12, oxygen-eliminating device and adopts PID to control to calculate, obtain the controlling increment du_qm of porthole and the controlling increment du_sm of water valve, and the transient state control time is deducted to 1 unit interval; Step 11 or step 12 all enter step 13 after finishing, calculate intake gate 1-1 and the admission door 2-1 control output quantity of each oxygen-eliminating device 4 and complete corresponding control operation, computation process is specially: steps A, search oxygen-eliminating device 4 middle water level soprano and the lowests, corresponding AO_h and the AO_L of counting; If du_sm > 0, give oxygen-eliminating device 4 middle water level the lowest AO_L moisturizings, rate of water make-up is AO_L+du_sm; Other intake gate 1-1 does not regulate; If du_sm<0, give oxygen-eliminating device 4 middle water level soprano AO_h diminishings, the 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] be this oxygen-eliminating device aperture; Perform step 14, this controls sampling period and finishes, and returns to step 1.
Oxygen-eliminating device 4 control methods of prior art generally adopt single loop PID control strategy, because can not stable operation putting into operation, can only lean on manually and regulate.The inventive method contains and has solved the prior art oxygen-eliminating device all problems run in service, and for these problems, provide respectively decision logic and control program, effectively overcome the various disturbing factors during the oxygen-eliminating device operation is controlled automatically, realized the automatic operation of paired running oxygen-eliminating device system long-term stability.Due to the control technology that has adopted transient state and stable state to separate, both guaranteed the corresponding fast of the crisis moment, realized again the steady adjusting under the stable case, reduce the valve event frequency, extended the serviceable life of valve.
The 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 is controlled schematic diagram, and Fig. 4 is that oxygen-eliminating device pressure is controlled 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, whether judgement surpasses threshold value from the load variations of boiler 5, if "Yes", operating procedure three, the boiler load signal x of usining control the feedforward compensation of output as the water valve aperture; The transient state control time Tzt=4Ti of feedforward compensation, then enter step 10; Do whether operating procedure four, judgement change Tb over threshold value from the pressure of the female pipe 2 of air feed if the result of step 2 is "No"? if "Yes", operating procedure five, the vapor pressure signal of usining are controlled the feedforward compensation of output as the porthole aperture; The transient state control time Tzt=8Ti of feedforward compensation, then enter step 10; Do operating procedure six, judgement change whether surpass threshold value from the pressure of hydrophobic female pipe 3 if the result of step 4 is "No"? if "Yes", operating procedure seven, hydrophobic female pipe 3 pressure signals are controlled the feedforward compensation of output as the 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", operating procedure eight, judge between each oxygen-eliminating device 4 whether water-head surpasses threshold value? if "Yes", operating procedure nine, enter transient state and control, transient state control time Tzt=8Ti, then enter step 10; The result of step 8 is "No", enters step 10, judges whether transient state control time Tzt is 0; The result of step 10 is "Yes", enters step 11, oxygen-eliminating device 4 employing fuzzy (Fuzzy) control calculating, regulates 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", enters step 12, oxygen-eliminating device employing PID control calculating, carries out quick adjustment.Obtain the controlling increment du_qm of porthole and the controlling increment du_sm of water valve, and the transient state control time is deducted to 1 unit interval; Step 11 or step 12 all enter step 13 after finishing, calculate intake gate 1-1 and the admission door 2-1 control output quantity of each oxygen-eliminating device 4 and complete corresponding control operation, computation process is specially: steps A, search oxygen-eliminating device 4 middle water level soprano and the lowests, corresponding AO_h and the AO_L of counting; If du_sm > 0, give oxygen-eliminating device 4 middle water level the lowest AO_L moisturizings, rate of water make-up is AO_L+du_sm; Other intake gate 1-1 does not regulate; If du_sm<0, give oxygen-eliminating device 4 middle water level soprano AO_h diminishings, the 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] be this oxygen-eliminating device aperture; Perform step 14, this controls sampling period and finishes, and returns to step 1.
In the present embodiment step 1, 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 present invention, according to the concrete condition of deaerators in parallel operation, is divided into Steady state and transient state by its adjustment process, during stable state, adopts fuzzy control technology, during transient state, adopts the PID control technology.When final output is calculated, 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 fast in change procedure;
(2) each deaerator level deviation is excessive;
(3) the oxygen-eliminating device initial steam pressure changes excessive;
(4) hydrophobic female pipe pressure of supply water changes excessive;
Whether the above-mentioned state of control program real-time judge occurs, in case occur, regulating system proceeds to immediately transient state process and controls, and extends execution a period of time.After transient state process was controlled and finished, regulating system namely proceeded 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 that the boiler load signal x of step 3 is 0.015 times of boiler water fluctuations in discharge, and in step 7, hydrophobic female pipe 3 pressure signals are 120 times that hydrophobic female pipe 3 pressure change.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, the vapor pressure signal is 150 times of changing value of air intake opening 2 supply gas pressures.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 that 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 that the threshold value of step 4 is per minute 0.1Mpa.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 per minute 0.1Mpa 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, whether judgement surpasses threshold value from the load variations of boiler (5), if "Yes", operating procedure three, the boiler load signal x of usining control the feedforward compensation of output as the water valve aperture; The transient state control time Tzt=4Ti of feedforward compensation, then enter step 10; Do whether operating procedure four, judgement change Tb over threshold value from the pressure of the female pipe of air feed (2) if the result of step 2 is "No"? if "Yes", operating procedure five, the vapor pressure signal of usining are controlled the feedforward compensation of output as the porthole aperture; The transient state control time Tzt=8Ti of feedforward compensation, then enter step 10; If the result of step 4 is "No", do operating procedure six, judgement change whether surpass threshold value from the pressure of hydrophobic female pipe (3)? if "Yes", operating procedure seven, hydrophobic female pipe (3) pressure signal are controlled the feedforward compensation of output as the 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", operating procedure eight, judge between each oxygen-eliminating device (4) whether water-head surpasses threshold value? if "Yes", operating procedure nine, enter transient state and control, transient state control time Tzt=8Ti, then enter step 10; The result of step 8 is "No", enters step 10, judges whether transient state control time Tzt is 0; The result of step 10 is "Yes", enters step 11, oxygen-eliminating device (4) employing fuzzy control calculating, obtains the controlling increment du_qm of porthole and the controlling increment du_sm of water valve; The result of step 10 is "No", enters step 12, oxygen-eliminating device and adopts PID to control to calculate, obtain the controlling increment du_qm of porthole and the controlling increment du_sm of water valve, and the transient state control time is deducted to 1 unit interval; Step 11 or step 12 all enter step 13 after finishing, calculate intake gate (1-1) and admission door (2-1) the control output quantity of each oxygen-eliminating device (4) and complete corresponding control operation, computation process is specially: steps A, search oxygen-eliminating device (4) middle water level soprano and the lowest, corresponding AO_h and the AO_L of counting; If du_sm > 0, 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) is not regulated; If du_sm<0, give oxygen-eliminating device (4) middle water level soprano AO_h diminishing, the diminishing amount is AO_h+du_sm; Other intake gate (1-1) is not regulated; Step B, each oxygen-eliminating device admission door (2-1) aperture output quantity are AO[i]+du_qm, AO[i] be this oxygen-eliminating device aperture; Perform step 14, this controls sampling period and finishes, and returns to step 1.
2. paired running oxygen-eliminating device intelligent control method according to claim 1, the time span that it is characterized in that the sampling period in step 1 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, the boiler load signal x that it is characterized in that step 3 is 0.015 times of boiler water fluctuations in discharge, and in step 7, hydrophobic female pipe (3) pressure signal is 120 times that hydrophobic female pipe (3) pressure changes.
4. paired running oxygen-eliminating device intelligent control method according to claim 1, is characterized in that vapor pressure signal in step 5 is 150 times of changing value of air intake opening (2) supply gas pressure.
5. paired running oxygen-eliminating device intelligent control method according to claim 1, the threshold value that it is characterized in that step 4 is per minute 0.1Mpa.
6. paired running oxygen-eliminating device intelligent control method according to claim 1, the threshold value that it is characterized in that 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 per minute 0.1Mpa of step 6.
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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Cited By (6)
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| CN106678773A (en) * | 2016-12-30 | 2017-05-17 | 淮海工学院 | Fuzzy control and fuzzy feedforward compensation combined control method for thermal deaerator |
| CN108062117A (en) * | 2017-12-29 | 2018-05-22 | 国电科学技术研究院 | A kind of more oxygen-eliminating device paired running water-level control apparatus |
| CN111694380A (en) * | 2020-06-18 | 2020-09-22 | 西安热工研究院有限公司 | Efficient and energy-saving water level control method for self-adaptive deaerator |
| CN112577036A (en) * | 2020-12-11 | 2021-03-30 | 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 |
| CN112631343A (en) * | 2020-12-23 | 2021-04-09 | 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 |
| CN113883495A (en) * | 2021-09-28 | 2022-01-04 | 北京和隆优化科技股份有限公司 | Deaerator group liquid level coordination control method and system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106678773A (en) * | 2016-12-30 | 2017-05-17 | 淮海工学院 | Fuzzy control and fuzzy feedforward compensation combined control method for thermal deaerator |
| CN108062117A (en) * | 2017-12-29 | 2018-05-22 | 国电科学技术研究院 | A kind of more oxygen-eliminating device paired running water-level control apparatus |
| CN111694380A (en) * | 2020-06-18 | 2020-09-22 | 西安热工研究院有限公司 | Efficient and energy-saving water level control method for self-adaptive deaerator |
| 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 |
| CN112577036A (en) * | 2020-12-11 | 2021-03-30 | 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 |
| CN112631343A (en) * | 2020-12-23 | 2021-04-09 | 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 |
| CN113883495A (en) * | 2021-09-28 | 2022-01-04 | 北京和隆优化科技股份有限公司 | Deaerator group liquid level coordination control method and 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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