CN114967772A - Multivariable cooperative adjustment method and device for a plurality of deaerators communicated and operated in parallel - Google Patents
Multivariable cooperative adjustment method and device for a plurality of deaerators communicated and operated in parallel Download PDFInfo
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- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The embodiment of the application discloses a multivariable cooperative adjustment method and a multivariable cooperative adjustment device for a plurality of deaerators which are communicated and run in parallel, wherein the method comprises the following steps: when a plurality of deaerators which are communicated and run in parallel are in an automatic state, respectively acquiring the actual value of the variable of each deaerator; the variables include: liquid level and pressure; calculating the average value of the variable according to the actual value of the variable; and executing a corresponding locking limitation strategy according to the magnitude relation between the average value of the variable and the preset average target value of the variable. Through the scheme of the embodiment, the coupling effect of the pressure and the liquid level of the decoupling deaerator is realized, so that the deaerator can stably respond to load change.
Description
Technical Field
The embodiment of the application relates to a control technology of deaerators, in particular to a multivariable cooperative adjustment method and device for a plurality of deaerators which are communicated and run in parallel.
Background
In a cogeneration enterprise, most of common boiler steam engines are operated by main pipes, so that a plurality of corresponding deaerators are also operated in parallel, and the plurality of deaerators which are operated in parallel are communicated with each other by a steam balance main pipe and a water balance main pipe. Such an operation process has certain difficulties for the adjustment of operators. The deaerator has pressure regulating valve and water inlet regulating valve, guarantees the pressure of deaerator, guarantees the deoxidization effect, needs the liquid level of guaranteeing the deaerator again, guarantees safe operation.
The existing control means generally considers the liquid level adjustment of a single deaerator and the pressure adjustment of the single deaerator separately, or considers the average water level and the average pressure separately for deaerators which can run in parallel. However, the adjustment schemes do not consider that the deaerators running in parallel are communicated with the steam balance and water balance main pipes, the deaerators running in parallel have self-balancing capacity, and the deaerators have the phenomena of water pressing and water returning according to different static pressure differences of the deaerators. The coupling phenomenon can be caused by singly considering the liquid level or the pressure, and the decoupling operation can be well realized only by comprehensively considering the pressure and the liquid level requirements.
Disclosure of Invention
The embodiment of the application provides a multivariable cooperative adjustment method and device for a plurality of deaerators which are communicated and run in parallel, and the method and device can decouple the coupling effect of the pressure and the liquid level of the deaerators, so that the deaerators can stably respond to load changes.
The embodiment of the application provides a multivariable cooperative adjustment method for a plurality of deaerators which are communicated and run in parallel, and the method can comprise the following steps:
when a plurality of deaerators which are communicated and run in parallel are in an automatic state, respectively acquiring the actual value of the variable of each deaerator; the variables include: liquid level and pressure;
calculating the average value of the variable according to the actual value of the variable;
and executing a corresponding locking limitation strategy according to the magnitude relation between the average value of the variable and the preset average target value of the variable.
In an exemplary embodiment of the present application, the calculating the average value of the variable according to the actual value of the variable may include: calculating the average value of the liquid levels of the deaerators according to the actual values of the liquid levels of the deaerators; and calculating the average value of the pressures of the deaerators according to the actual values of the pressures of the deaerators.
In an exemplary embodiment of the present application, before executing the corresponding locking limitation strategy according to a magnitude relationship between the average value of the variable and a preset average target value of the variable, the method further comprises:
adjusting the actual value of the liquid level of each deaerator to be the average value of the liquid level, and setting the set value of the liquid level of each deaerator to be the average target value of the liquid level; and the number of the first and second groups,
and adjusting the actual value of the pressure of each deaerator to be the average value of the pressure, and setting the set value of the pressure of each deaerator to be the average target value of the pressure.
In an exemplary embodiment of the present application, when the variable is a liquid level, the executing a corresponding lock-up limiting strategy according to a magnitude relationship between an average value of the variable and a preset average target value of the variable may include:
when the difference value between the average value of the liquid level and the average target value of the liquid level is out of a preset liquid level deviation range, ignoring the locking limiting strategy;
when the difference value between the average value of the liquid level and the average target value of the liquid level is within a preset liquid level deviation range, determining to execute a corresponding locking limiting strategy on the water inlet valve of each deaerator according to the size relation between the liquid level of each deaerator and the average target value of the liquid level, and/or determining to execute a corresponding locking limiting strategy on the water inlet valves of all deaerators according to the size relation between the sum of the liquid levels of all deaerators and a preset total liquid level threshold value.
In an exemplary embodiment of the present application, the determining to execute a corresponding blocking restriction strategy on the water inlet valve of each deaerator according to a magnitude relation between the liquid level of each deaerator and the average target value of the liquid level may include:
when the liquid level of any one or more deaerators is higher than the average target value of the liquid level and is larger than or equal to a preset first liquid level threshold value, forbidding the current opening degree of a water inlet valve of the one or more deaerators to increase so as to forbid the increase of inlet water;
and when the liquid level of any one or more deaerators is lower than the average target value of the liquid level and is larger than or equal to a preset second liquid level threshold value, forbidding the current opening degree of a water inlet valve of any one or more deaerators to be reduced so as to forbid the reduction of inlet water.
In an exemplary embodiment of the present application, the determining to execute the corresponding locking limiting strategy on the water inlet valves of all the deaerators according to a magnitude relationship between a sum of liquid levels of all the deaerators and a preset total liquid level threshold may include:
when the sum of the liquid levels of all the deaerators is higher than a preset total liquid level set value, and the numerical value is larger than or equal to a preset third liquid level threshold value, forbidding the current opening degree of water inlet valves of all the deaerators to increase so as to forbid the increase of water inlet;
and when the sum of the liquid levels of all the deaerators is lower than the preset total liquid level set value and the numerical value is larger than or equal to the preset fourth liquid level threshold value, forbidding the current opening degree of the water inlet valves of all the deaerators to be reduced so as to forbid the reduction of water inlet.
In an exemplary embodiment of the present application, when the variable is a pressure, the executing a corresponding locking limitation strategy according to a magnitude relationship between the average value of the variable and a preset average target value of the variable may include:
ignoring the lock-up restriction strategy when a difference between the average value of the pressures and the average target value of the pressures is outside a preset pressure deviation range;
when the difference value between the average value of the pressure and the average target value of the pressure is within a preset pressure deviation range, determining to execute a corresponding locking limiting strategy on the pressure valve of each deaerator according to the magnitude relation between the pressure of each deaerator and the average value of the pressure, and/or determining to execute a corresponding locking limiting strategy on the pressure valve of each deaerator according to the magnitude relation between the liquid level of each deaerator and the average target value of the liquid level and the magnitude relation between the average value of the pressure and the average target value of the pressure.
In an exemplary embodiment of the present application, the determining to implement the corresponding lockout limit strategy for the pressure valve of each deaerator according to a magnitude relationship between the pressure of each deaerator and an average value of the pressures may include:
when the pressure of any one or more deaerators is higher than the average value of the pressures and is larger than or equal to a preset first pressure threshold value, inhibiting the pressure valve of any one or more deaerators from increasing the pressure;
and when the pressure of any one or more deaerators is lower than the average value of the pressures and is larger than or equal to a preset second pressure threshold value, the pressure valve of any one or more deaerators is forbidden to reduce the pressure.
In an exemplary embodiment of the present application, when the average value of the pressure is lower than the average target value of the pressure by a value greater than or equal to a preset third pressure threshold, the determining to execute a corresponding lockout restriction strategy for the pressure valve of each deaerator according to a magnitude relationship between the liquid level of each deaerator and the average target value of the liquid level and a magnitude relationship between the average value of the pressure and the average target value of the pressure may include:
when the liquid level of any one or more deaerators is lower than the average target value of the liquid level and is larger than or equal to a preset fifth liquid level threshold value, pressure increase of a pressure valve of any one or more deaerators is forbidden;
and when the liquid level of any one or more deaerators is higher than the average target value of the liquid level by a value which is larger than or equal to a preset sixth liquid level threshold value, the pressure valve of any one or more deaerators is forbidden to reduce the pressure.
In an exemplary embodiment of the present application, when the average value of the pressure is higher than the average target value of the pressure by a value greater than or equal to a preset fourth pressure threshold, determining to execute a corresponding lockout restriction strategy on the pressure valve of each deaerator according to a magnitude relationship between the liquid level of each deaerator and the average target value of the liquid level and a magnitude relationship between the average value of the pressure and the average target value of the pressure, may further include:
when the liquid level of any one or more deaerators is lower than the average target value of the liquid level and is larger than or equal to a preset seventh liquid level threshold value, pressure increase of a pressure valve of any one or more deaerators is forbidden;
and when the liquid level of any one or more deaerators is higher than the average target value of the liquid level by a value which is larger than or equal to a preset eighth liquid level threshold value, the pressure valve of any one or more deaerators is forbidden to reduce the pressure.
The embodiment of the application also provides a multivariable cooperative adjustment device for a plurality of deaerators which are communicated and run in parallel, which comprises a processor and a computer readable storage medium, wherein instructions are stored in the computer readable storage medium, and when the instructions are executed by the processor, the multivariable cooperative adjustment method for the plurality of deaerators which are communicated and run in parallel is realized.
Compared with the related art, the embodiment of the application can comprise the following steps: when a plurality of deaerators which are communicated and run in parallel are in an automatic state, respectively acquiring the actual value of the variable of each deaerator; the variables include: liquid level and pressure; calculating the average value of the variable according to the actual value of the variable; and executing a corresponding locking limiting strategy according to the magnitude relation between the average value of the variable and a preset average target value of the variable. Through the scheme of the embodiment, the coupling effect of the pressure and the liquid level of the decoupling deaerator is realized, so that the deaerator can stably respond to load change.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Drawings
The drawings are intended to provide an understanding of the present disclosure, and are to be considered as forming a part of the specification, and are to be used together with the embodiments of the present disclosure to explain the present disclosure without limiting the present disclosure.
FIG. 1 is a flow chart of a multivariable cooperative adjustment method for a plurality of deaerators communicated and operated in parallel according to an embodiment of the present application;
FIG. 2 is a schematic view of liquid level adjustment according to an embodiment of the present application;
FIG. 3 is a schematic diagram of pressure regulation according to an embodiment of the present application;
FIG. 4 is a block diagram of a multivariable cooperative adjustment device of a plurality of deaerators connected in parallel operation according to an embodiment of the present application.
Detailed Description
The present application describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in this application may also be combined with any conventional features or elements to form a unique inventive concept as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be restricted except in light of the attached claims and their equivalents. Further, various modifications and changes may be made within the scope of the appended claims.
Further, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.
The embodiment of the application provides a multivariable collaborative adjustment method for a plurality of deaerators which are communicated and run in parallel, and as shown in fig. 1, the method can comprise the following steps of S101-S103:
s101, respectively acquiring the actual value of the variable of each deaerator when a plurality of deaerators which are communicated and run in parallel are in an automatic state; the variables include: liquid level and pressure;
s102, calculating the average value of the variable according to the actual value of the variable;
s103, executing a corresponding locking limiting strategy according to the magnitude relation between the average value of the variable and a preset average target value of the variable.
In the exemplary embodiment of the application, under the condition that the quality of liquid level and pressure measuring points of the deaerator is good, a plurality of deaerators which are communicated and run in parallel are put into a variable automatic balance state.
In the exemplary embodiment of the present application, when a plurality of deaerators connected in parallel operation are in an automatic state (i.e., a state in which a plurality of variables such as pressure and liquid level are automatically adjusted), actual values PVL1, PVL2, … …, PVLN of the liquid level of the deaerator, target values (preset values) SPL1, SPL2, … …, SPLX of the liquid level of the deaerator, actual values PVp1, PVp2, … …, PVpN of the pressure of the deaerator, target values (preset values) SPp1, SPp2, … …, SPpN of the pressure of the deaerator, an average actual value PVLAVG of the liquid level, an average target value (preset value) SPLAVG of the liquid level, an average actual value PVPAVG of the pressure, and an average target value (preset value) SPPAVG of the pressure may be obtained, respectively.
In an exemplary embodiment of the present application, the calculating the average value of the variable according to the actual value of the variable may include:
calculating the average value of the liquid levels of the deaerators according to the actual values of the liquid levels of the deaerators; and the number of the first and second groups,
calculating the average value of the pressures of the deaerators according to the actual values of the pressures of the deaerators.
In an exemplary embodiment of the present application, when the pressure and level of a single deaerator are put into an automatic state, the pressure and level are only involved in the average level, average pressure calculation: wherein N is the number of pressure and liquid level respectively put into automatic state:
PVLAVG＝(PVL1+PVL2+……+PVLN)/N；
PVPAVG＝(PVP1+PVP2+……+PVPN)/N；
SPLAVG＝(SPL1+SPL2+……+SPLN)/N；
SPPAVG＝(SPP1+SPP2+……+SPPN)/N。
in an exemplary embodiment of the present application, before executing the corresponding locking limitation strategy according to a magnitude relationship between the average value of the variable and a preset average target value of the variable, the method further comprises:
adjusting the actual value of the liquid level of each deaerator to be the average value of the liquid level, and setting the set value of the liquid level of each deaerator to be the average target value of the liquid level; and the number of the first and second groups,
and adjusting the actual value of the pressure of each deaerator to be the average value of the pressure, and setting the set value of the pressure of each deaerator to be the average target value of the pressure.
In an exemplary embodiment of the present application, for a single deaerator level circuit: the actual value of the liquid level can be adjusted to be the average actual value PV of the liquid level LAVG The set value is set as the average target value SP of the liquid level LAVG (ii) a For a single deaerator pressure loop: the actual value of the regulated pressure is the average actual value PV of the pressure PAVG The set value is set as the average target value SP of the pressure PAVG 。
In an exemplary embodiment of the present application, the independent level circuit and the pressure circuit each have a lock-out limit condition, and the independent level circuit and the pressure circuit may be adjusted according to the lock-out limit condition.
In an exemplary embodiment of the present application, the lockout limits for the level circuit and the pressure circuit are described in detail below.
In an exemplary embodiment of the present application, as shown in fig. 2, when the variable is a liquid level, the executing a corresponding latch-up limiting strategy according to a magnitude relationship between the average value of the variable and a preset average target value of the variable may include:
ignoring the lockout limit strategy when a difference between the average value of the liquid levels (i.e., an average liquid level) and an average target value of the liquid levels (i.e., an average set point of liquid levels) is outside a preset liquid level deviation range;
when the difference value between the average value of the liquid level and the average target value of the liquid level is within a preset liquid level deviation range, determining to execute a corresponding locking limiting strategy on the water inlet valve of each deaerator according to the size relation between the liquid level of each deaerator (namely the liquid level) and the average target value of the liquid level (namely the average set value of the liquid level), and/or determining to execute a corresponding locking limiting strategy on the water inlet valves of all deaerators according to the size relation between the sum of the liquid levels of all deaerators and a preset total liquid level threshold value.
In the exemplary embodiment of the present application, the preset liquid level deviation range may be defined by itself according to different precision requirements or different application scenarios, and the detailed value of the liquid level deviation range is not limited herein. For example, but not limited to, ± 100mm (millimeters).
In an exemplary embodiment of the present application, the preset lockout limit strategy is disabled when the difference between the average value of the liquid level and the average target value of the liquid level is outside ± 100 mm.
In an exemplary embodiment of the application, when a difference value between the average value of the liquid level and the average target value of the liquid level is within ± 100mm, a corresponding locking limiting strategy is determined to be executed on the water inlet valve of each deaerator according to a magnitude relation between the liquid level of each deaerator and the average target value of the liquid level, and/or a corresponding locking limiting strategy is determined to be executed on the water inlet valves of all deaerators according to a magnitude relation between the sum of the liquid levels of all deaerators and a preset total liquid level threshold value.
In an exemplary embodiment of the present application, the determining to execute a corresponding blocking restriction strategy on the water inlet valve of each deaerator according to a magnitude relation between the liquid level of each deaerator and the average target value of the liquid level may include:
when the liquid level of any one or more deaerators is higher than the average target value of the liquid level and is larger than or equal to a preset first liquid level threshold value, forbidding the current opening degree of a water inlet valve of the one or more deaerators to increase so as to forbid the increase of inlet water;
and when the liquid level of any one or more deaerators is lower than the average target value of the liquid level and is larger than or equal to a preset second liquid level threshold value, forbidding the current opening degree of a water inlet valve of any one or more deaerators to be reduced so as to forbid the reduction of inlet water.
In an exemplary embodiment of the present application, the first liquid level threshold and the second liquid level threshold may be self-defined according to different application scenarios, and detailed values of the first liquid level threshold and the second liquid level threshold are not limited herein, and the values of the first liquid level threshold and the second liquid level threshold may be the same or different. For example, the first and second liquid level thresholds may each be 50 mm.
In an exemplary embodiment of the present application, when a liquid level of any one or more deaerators is higher than an average target value of the liquid level by a value greater than or equal to 50mm, a lock increase may be performed, that is, an increase of inflow water is prohibited on the basis of an opening degree of an existing inflow valve, that is, a current opening degree of an inflow valve of the any one or more deaerators is prohibited from increasing to prohibit an increase of inflow water.
In an exemplary embodiment of the present application, when the liquid level of any one or more deaerators is lower than the average target value of the liquid level by a value greater than or equal to 50mm, a lock-down, that is, a reduction of inflow water is prohibited on the basis of the opening degree of the existing inflow valve, that is, a current opening degree of the inflow valve of the any one or more deaerators is prohibited from being reduced to prohibit a reduction of inflow water.
In an exemplary embodiment of the present application, the determining to execute the corresponding blocking restriction strategy on the water inlet valves of all the deaerators according to a magnitude relationship between a sum of liquid levels of all the deaerators and a preset total liquid level threshold may include:
when the sum of the liquid levels of all the deaerators is higher than a preset total liquid level set value, and the numerical value is larger than or equal to a preset third liquid level threshold value, forbidding the current opening degree of water inlet valves of all the deaerators to increase so as to forbid the increase of water inlet;
and when the sum of the liquid levels of all the deaerators is lower than the preset total liquid level set value and the numerical value is larger than or equal to the preset fourth liquid level threshold value, forbidding the current opening degree of the water inlet valves of all the deaerators to be reduced so as to forbid the reduction of water inlet.
In an exemplary embodiment of the present application, the third liquid level threshold and the fourth liquid level threshold may be self-defined according to different application scenarios, and detailed values of the third liquid level threshold and the fourth liquid level threshold are not limited herein, and values of the third liquid level threshold and the fourth liquid level threshold may be the same or different, and values of the third liquid level threshold and the fourth liquid level threshold may be smaller than values of the first liquid level threshold and the second liquid level threshold. For example, the third liquid level threshold and the fourth liquid level threshold may both be 40 mm.
In an exemplary embodiment of the present application, when the sum of the liquid levels of all deaerators is greater than or equal to 40mm and the all deaerators are in an automatic state, the blocking is increased, that is, the current opening degree of the water inlet valves of all deaerators is prohibited from being increased, so as to prohibit the water inlet from being increased.
In an exemplary embodiment of the present application, when the sum of the liquid levels of all deaerators is lower than a preset total liquid level set value by a value greater than or equal to 40mm and all deaerators are in an automatic state, the deaerators are locked to be reduced, that is, the current opening degree of the water inlet valves of all deaerators is prohibited to be reduced, so as to prohibit the reduction of the inlet water.
In an exemplary embodiment of the present application, as shown in fig. 3, when the variable is a pressure, the executing a corresponding locking limitation strategy according to a magnitude relationship between the average value of the variable and a preset average target value of the variable may include:
ignoring the lock-up restriction strategy when a difference between the average value of the pressures (i.e., an average pressure) and an average target value of the pressures (i.e., an average set value of the pressures) is outside a preset pressure deviation range;
when the difference value between the average value of the pressure and the average target value of the pressure is within a preset pressure deviation range, determining to execute a corresponding locking limiting strategy on the pressure valve of each deaerator according to the magnitude relation between the pressure (namely the pressure of the deaerator) and the average value of the pressure (namely the average pressure), and/or determining to execute a corresponding locking limiting strategy on the pressure valve of each deaerator according to the magnitude relation between the liquid level (namely the liquid level of the deaerator) and the average target value of the liquid level (namely the average liquid level set value) and the magnitude relation between the average value of the pressure and the average target value of the pressure.
In an exemplary embodiment of the present application, the preset pressure deviation range may be defined by itself according to different precision requirements or different application scenarios, and the detailed value of the pressure deviation range is not limited herein. For example, but not limited to, ± 0.008MPa (megapascals) may be included.
In an exemplary embodiment of the present application, the preset lockout limit strategy is ineffective when the difference between the average value of the pressures and the average target value of the pressures is outside of ± 0.008 MPa.
In an exemplary embodiment of the application, when a difference value between the average value of the pressure and the average target value of the pressure is within ± 0.008MPa, a corresponding locking limiting strategy is determined to be executed on a pressure valve of each deaerator according to a magnitude relation between the pressure of each deaerator and the average value of the pressure, and/or a corresponding locking limiting strategy is determined to be executed on a pressure valve of each deaerator according to a magnitude relation between a liquid level of each deaerator and the average target value of the liquid level and a magnitude relation between the average value of the pressure and the average target value of the pressure.
In an exemplary embodiment of the present application, the determining to implement the corresponding lockout limit strategy for the pressure valve of each deaerator according to a magnitude relationship between the pressure of each deaerator and an average value of the pressures may include:
when the pressure of any one or more deaerators is higher than the average value of the pressures and is larger than or equal to a preset first pressure threshold value, inhibiting the pressure valve of any one or more deaerators from increasing the pressure;
and when the pressure of any one or more deaerators is lower than the average value of the pressures and is larger than or equal to a preset second pressure threshold value, the pressure valve of any one or more deaerators is forbidden to reduce the pressure.
In an exemplary embodiment of the present application, the first pressure threshold and the second pressure threshold may be self-defined according to different application scenarios, and detailed values of the first pressure threshold and the second pressure threshold are not limited herein, and the values of the first pressure threshold and the second pressure threshold may be the same or different. For example, the first pressure threshold and the second pressure threshold may both be 0.01 MPa.
In an exemplary embodiment of the present application, when the pressure of any one or more deaerators is higher than the average target value of the pressure by a value greater than or equal to 0.01MPa, lock-up may be performed, that is, the pressure valve of any one or more deaerators is prohibited from increasing the pressure.
In an exemplary embodiment of the present application, the lock-down, i.e., the pressure valve of any one or more deaerators is inhibited from reducing the pressure, may be performed when the pressure of any one or more deaerators is lower than the average target value of the pressure by a value greater than or equal to 0.01 MPa.
In an exemplary embodiment of the present application, when the average value of the pressure is lower than the average target value of the pressure by a value greater than or equal to a preset third pressure threshold, the determining to execute a corresponding lockout restriction strategy for the pressure valve of each deaerator according to a magnitude relationship between the liquid level of each deaerator and the average target value of the liquid level and a magnitude relationship between the average value of the pressure and the average target value of the pressure may include:
when the liquid level of any one or more deaerators is lower than the average target value of the liquid level and is larger than or equal to a preset fifth liquid level threshold value, pressure increase of a pressure valve of any one or more deaerators is forbidden;
and when the liquid level of any one or more deaerators is higher than the average target value of the liquid level by a value which is larger than or equal to a preset sixth liquid level threshold value, the pressure valve of any one or more deaerators is forbidden to reduce the pressure.
In an exemplary embodiment of the present application, the fifth liquid level threshold and the sixth liquid level threshold may be self-defined according to different application scenarios, and detailed values of the fifth liquid level threshold and the sixth liquid level threshold are not limited herein, and the values of the fifth liquid level threshold and the sixth liquid level threshold may be the same or different, and the values of the fifth liquid level threshold and the sixth liquid level threshold may be smaller than the values of the third liquid level threshold and the fourth liquid level threshold. For example, the fifth level threshold and the sixth level threshold may both be 30 mm.
In an exemplary embodiment of the present application, the third pressure threshold may be self-defined according to different application scenarios, and a detailed value of the third pressure threshold is not limited herein, and the value of the third pressure threshold may be smaller than the values of the first pressure threshold and the second pressure threshold. For example, the third pressure thresholds may each be 0.0005 MPa.
In an exemplary embodiment of the application, when the average value of the pressure is lower than the average target value of the pressure by a value greater than or equal to 0.0005MPa and the liquid level of any one or more deaerators is lower than the average target value of the liquid level by a value greater than or equal to 30mm, and in an automatic state, the deaerators are locked, that is, the pressure valves of any one or more deaerators are prohibited from increasing the pressure.
In an exemplary embodiment of the present application, when the average value of the pressure is lower than the average target value of the pressure by a value greater than or equal to 0.0005MPa and the liquid level of any one or more deaerators is higher than the average target value of the liquid level by a value greater than or equal to 30mm, and in an automatic state, the pressure is blocked, that is, the pressure valve of any one or more deaerators is prohibited from reducing the pressure.
In an exemplary embodiment of the present application, when the average value of the pressure is higher than the average target value of the pressure by a value greater than or equal to a preset fourth pressure threshold, determining to execute a corresponding lockout restriction strategy on the pressure valve of each deaerator according to a magnitude relationship between the liquid level of each deaerator and the average target value of the liquid level and a magnitude relationship between the average value of the pressure and the average target value of the pressure, may further include:
when the liquid level of any one or more deaerators is lower than the average target value of the liquid level and is larger than or equal to a preset seventh liquid level threshold value, pressure increase of a pressure valve of any one or more deaerators is forbidden;
and when the liquid level of any one or more deaerators is higher than the average target value of the liquid level by a value which is larger than or equal to a preset eighth liquid level threshold value, the pressure valve of any one or more deaerators is forbidden to reduce the pressure.
In an exemplary embodiment of the present application, the seventh liquid level threshold and the eighth liquid level threshold may be self-defined according to different application scenarios, and detailed values of the seventh liquid level threshold and the eighth liquid level threshold are not limited herein, and values of the seventh liquid level threshold and the eighth liquid level threshold may be the same or different, and values of the seventh liquid level threshold and the eighth liquid level threshold may be smaller than values of the third liquid level threshold and the fourth liquid level threshold. For example, the seventh liquid level threshold and the eighth liquid level threshold may both be 30 mm.
In an exemplary embodiment of the present application, the fourth pressure threshold may be self-defined according to different application scenarios, and a detailed value of the fourth pressure threshold is not limited herein, and a value of the fourth pressure threshold may be smaller than values of the first pressure threshold and the second pressure threshold. For example, the fourth pressure thresholds may each be 0.0005 MPa.
In an exemplary embodiment of the present application, when the average value of the pressure is higher than the average target value of the pressure by a value greater than or equal to 0.0005MPa and the liquid level of any one or more deaerators is lower than the average target value of the liquid level by a value greater than or equal to 30mm, and in an automatic state, the pressure is blocked, that is, the pressure valve of any one or more deaerators is prohibited from increasing the pressure.
In an exemplary embodiment of the present application, when the average value of the pressure is higher than the average target value of the pressure by a value greater than or equal to 0.0005MPa and the liquid level of any one or more deaerators is higher than the average target value of the liquid level by a value greater than or equal to 30mm, and in an automatic state, the pressure is blocked, that is, the pressure valve of any one or more deaerators is prohibited from reducing the pressure.
In the exemplary embodiment of the application, when the average target values of the liquid level and the pressure of a plurality of deaerators are greatly deviated from the actual average value, the deaerators can be adjusted simultaneously; when the average target value of the liquid level and the pressure of many deaerators and the deviation of actual average value are not big, can carry out the subsection to many deaerators and adjust, reach balance adjustment's purpose, concrete measure includes: the deaerator with a high water level locks and opens the water inlet valve (namely, the opening of the water inlet valve is forbidden to increase so as to forbid increasing of water inflow), the deaerator with a low water level locks and closes the water inlet valve (namely, the opening of the water inlet valve is forbidden to decrease or close so as to forbid decreasing of water inflow), when the average value of the liquid levels is high, all deaerators lock and open the water inlet valve (namely, all deaerators forbid the opening of the water inlet valve to increase so as to forbid increasing of water inflow), and when the average value of the liquid levels is low, all deaerators lock and close the water inlet valve (namely, all deaerators forbid the opening of the water inlet valve to decrease or close so as to forbid decreasing of water inflow). When the pressure of the current deaerator is low and the liquid level is low, the pressure valve is locked (i.e., the pressure valve of the deaerator with the high liquid level is opened, and the pressure increase of the current deaerator is prohibited), when the pressure of the current deaerator is low and the liquid level is high, the pressure valve is locked (i.e., the pressure valve of the deaerator with the low liquid level is closed, and the current deaerator is prohibited from decreasing the pressure, and the pressure of the current deaerator can be increased), when the pressure of the current deaerator is high and the liquid level is high, the pressure valve is locked (i.e., the pressure valve of the deaerator with the high liquid level is opened, so that the pressure of the deaerator is increased, and the current deaerator is prohibited from increasing the pressure, or the pressure of the current deaerator is decreased).
In the exemplary embodiment of the application, the pressure and the liquid level of a plurality of deaerators running in parallel are adjusted by adopting an average value, and the pressure and the liquid level valve of a single deaerator are adjusted by the liquid level and the pressure deviation of the single deaerator; the scheme of the embodiment has wide applicability, can be suitable for the deaerators running in parallel at high and low pressures, has strong balanced disturbance capability, can integrally consider a plurality of deaerators running in parallel, fully plays the advantages of the parallel running of the deaerators, and integrally considers disturbance change and uniformly shares response when integrally considering.
In the exemplary embodiment of the application, through the scheme of the embodiment of the application, the liquid level and the pressure of the deaerator are comprehensively considered, the self-balancing capacity of the deaerator is synthesized, and the pressure and the liquid level are adjusted according to the total liquid level and the average liquid level of the deaerator and decoupling.
The embodiment of the present application further provides a multivariable cooperative adjustment apparatus 1 for communicating a plurality of deaerators operating in parallel, as shown in fig. 4, which may include a processor 11 and a computer-readable storage medium 12, where the computer-readable storage medium 12 stores instructions, and when the instructions are executed by the processor 11, the multivariable cooperative adjustment method for communicating a plurality of deaerators operating in parallel is implemented.
In the exemplary embodiment of the present application, any of the foregoing embodiments of the multivariate cooperative adjustment method for communicating a plurality of deaerators operating in parallel is applicable to the embodiment of the apparatus, and details are not repeated here.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (10)
1. A multivariable cooperative adjustment method for a plurality of deaerators which are communicated and run in parallel is characterized by comprising the following steps:
when a plurality of deaerators which are communicated and run in parallel are in an automatic state, respectively acquiring the actual value of the variable of each deaerator; the variables include: liquid level and pressure;
calculating the average value of the variable according to the actual value of the variable;
and executing a corresponding locking limiting strategy according to the magnitude relation between the average value of the variable and a preset average target value of the variable.
2. The method of claim 1, wherein said calculating an average value of said variable from actual values of said variable comprises: calculating the average value of the liquid levels of the deaerators according to the actual values of the liquid levels of the deaerators; calculating the average value of the pressures of the deaerators according to the actual values of the pressures of the deaerators;
before executing the corresponding locking limitation strategy according to the magnitude relation between the average value of the variable and the preset average target value of the variable, the method further comprises the following steps:
adjusting the actual value of the liquid level of each deaerator to be the average value of the liquid level, and setting the set value of the liquid level of each deaerator to be the average target value of the liquid level; and the number of the first and second groups,
and adjusting the actual value of the pressure of each deaerator to be the average value of the pressure, and setting the set value of the pressure of each deaerator to be the average target value of the pressure.
3. The multivariable cooperative adjustment method for the plurality of communicated parallel-operation deaerators, as claimed in claim 1, wherein when the variable is a liquid level, the executing of the corresponding lockout limit strategy according to the magnitude relationship between the average value of the variable and the preset average target value of the variable comprises:
when the difference value between the average value of the liquid level and the average target value of the liquid level is out of a preset liquid level deviation range, ignoring the locking limiting strategy;
when the difference value between the average value of the liquid level and the average target value of the liquid level is within a preset liquid level deviation range, determining to execute a corresponding locking limiting strategy on the water inlet valve of each deaerator according to the size relation between the liquid level of each deaerator and the average target value of the liquid level, and/or determining to execute a corresponding locking limiting strategy on the water inlet valves of all deaerators according to the size relation between the sum of the liquid levels of all deaerators and a preset total liquid level threshold value.
4. The multivariable cooperative adjustment method for the plurality of communicated parallel-running deaerators is characterized in that the step of determining to execute a corresponding blocking limitation strategy on a water inlet valve of each deaerator according to the magnitude relation between the liquid level of each deaerator and the average target value of the liquid level comprises the following steps:
when the liquid level of any one or more deaerators is higher than the average target value of the liquid level and is larger than or equal to a preset first liquid level threshold value, forbidding the current opening degree of a water inlet valve of the one or more deaerators to increase so as to forbid the increase of inlet water;
and when the liquid level of any one or more deaerators is lower than the average target value of the liquid level and is larger than or equal to a preset second liquid level threshold value, forbidding the current opening degree of a water inlet valve of any one or more deaerators to be reduced so as to forbid the reduction of inlet water.
5. The multivariable cooperative adjustment method for the plurality of communicated deaerators running in parallel according to claim 3, wherein the determining to execute the corresponding locking limiting strategy on the water inlet valves of all the deaerators according to the magnitude relation between the sum of the liquid levels of all the deaerators and a preset total liquid level threshold value comprises:
when the sum of the liquid levels of all the deaerators is higher than a preset total liquid level set value, and the numerical value is larger than or equal to a preset third liquid level threshold value, forbidding the current opening degree of water inlet valves of all the deaerators to increase so as to forbid the increase of water inlet;
and when the sum of the liquid levels of all the deaerators is lower than the preset total liquid level set value and the numerical value is larger than or equal to the preset fourth liquid level threshold value, forbidding the current opening degree of the water inlet valves of all the deaerators to be reduced so as to forbid the reduction of water inlet.
6. The multivariable cooperative adjustment method for a plurality of communicated parallel-operation deaerators, according to any one of claims 1-5, characterized in that when the variable is pressure, the executing of the corresponding lockout limit strategy according to the magnitude relation between the average value of the variable and the preset average target value of the variable comprises:
ignoring the lockout limit strategy when a difference between the average value of the pressures and the average target value of the pressures is outside a preset pressure deviation range;
when the difference value between the average value of the pressure and the average target value of the pressure is within a preset pressure deviation range, determining to execute a corresponding locking limiting strategy on the pressure valve of each deaerator according to the magnitude relation between the pressure of each deaerator and the average value of the pressure, and/or determining to execute a corresponding locking limiting strategy on the pressure valve of each deaerator according to the magnitude relation between the liquid level of each deaerator and the average target value of the liquid level and the magnitude relation between the average value of the pressure and the average target value of the pressure.
7. The multivariable cooperative adjustment method for a plurality of interconnected parallel-operating deaerators, according to claim 6, wherein the determining of the magnitude relation between the pressure of each deaerator and the average value of the pressures to implement the corresponding blocking limiting strategy for the pressure valve of each deaerator comprises:
when the pressure of any one or more deaerators is higher than the average value of the pressures and is larger than or equal to a preset first pressure threshold value, pressure increase of the pressure valve of any one or more deaerators is forbidden;
and when the pressure of any one or more deaerators is lower than the average value of the pressures and is larger than or equal to a preset second pressure threshold value, the pressure valve of any one or more deaerators is forbidden to reduce the pressure.
8. The multivariable cooperative adjustment method for a plurality of deaerators communicated and operated in parallel according to claim 6, wherein when the average value of the pressure is lower than the average target value of the pressure by a value greater than or equal to a preset third pressure threshold, the determining to execute a corresponding blocking restriction strategy on the pressure valve of each deaerator according to the magnitude relation between the liquid level of each deaerator and the average target value of the liquid level and the magnitude relation between the average value of the pressure and the average target value of the pressure comprises:
when the liquid level of any one or more deaerators is lower than the average target value of the liquid level and is larger than or equal to a preset fifth liquid level threshold value, pressure increase of a pressure valve of any one or more deaerators is forbidden;
and when the liquid level of any one or more deaerators is higher than the average target value of the liquid level by a value which is larger than or equal to a preset sixth liquid level threshold value, the pressure valve of any one or more deaerators is forbidden to reduce the pressure.
9. The multivariable cooperative adjustment method for a plurality of deaerators connected in parallel operation according to claim 8, wherein when the average value of the pressure is higher than the average target value of the pressure by a value greater than or equal to a preset fourth pressure threshold, the method determines to execute a corresponding blocking restriction strategy on the pressure valve of each deaerator according to a magnitude relation between a liquid level of each deaerator and the average target value of the liquid level and a magnitude relation between the average value of the pressure and the average target value of the pressure, and further comprises:
when the liquid level of any one or more deaerators is lower than the average target value of the liquid level and is larger than or equal to a preset seventh liquid level threshold value, pressure increase of a pressure valve of any one or more deaerators is forbidden;
and when the liquid level of any one or more deaerators is higher than the average target value of the liquid level by a value which is larger than or equal to a preset eighth liquid level threshold value, the pressure valve of any one or more deaerators is forbidden to reduce the pressure.
10. A multivariable cooperative adjustment device for a plurality of communicating parallel-operating deaerators, comprising a processor and a computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, and when the instructions are executed by the processor, the multivariable cooperative adjustment method for the plurality of communicating parallel-operating deaerators is implemented according to any one of claims 1 to 9.
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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 |
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