CN114956219A - Automatic control method and system for chemical ammonia addition of thermal power plant - Google Patents

Automatic control method and system for chemical ammonia addition of thermal power plant Download PDF

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Publication number
CN114956219A
CN114956219A CN202210573469.9A CN202210573469A CN114956219A CN 114956219 A CN114956219 A CN 114956219A CN 202210573469 A CN202210573469 A CN 202210573469A CN 114956219 A CN114956219 A CN 114956219A
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specific conductance
pid controller
frequency
deaerator inlet
ammonia
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姬广丰
张向伟
李振鑫
巩家庆
杨爱萍
何龙
何福国
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Huaneng Lanzhou Thermal Power Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B11/00—Automatic controllers
    • G05B11/01—Automatic controllers electric
    • G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
    • G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
    • G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
    • G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Chemical & Material Sciences (AREA)
  • Water Supply & Treatment (AREA)
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Abstract

The embodiment of the specification provides a chemical ammonia adding automatic control method and system for a thermal power plant, wherein the method comprises the following steps: adjusting the output of a PID controller according to the deviation of the actual value of the specific conductance of the deaerator inlet and the set value of the specific conductance of the deaerator inlet to obtain a first adjustment frequency; according to the water supply flow value, a second adjusting frequency corresponding to the current water supply flow is obtained through a function generator; adding the first adjusting frequency and the second adjusting frequency through an adding arithmetic unit to obtain a final adjusting frequency; and automatically adjusting the frequency of the water feeding ammonia pump according to the calculated final adjustment frequency to realize the automatic control of chemical ammonia feeding. The problem that the ammonia adding amount cannot be accurately controlled is solved.

Description

Automatic control method and system for chemical ammonia addition of thermal power plant
Technical Field
The document relates to the technical field of chemical automatic control of thermal power plants, in particular to a chemical ammonia adding automatic control method and system for a thermal power plant.
Background
At present, a chemical ammonia adding control system of a common thermal power plant is generally characterized in that a water feeding ammonia adding pump operation interface is arranged on a chemical DCS (distributed control system), and an operator controls the ammonia adding amount of a water vapor system by manually adjusting the frequency of an ammonia adding pump.
Due to the hysteresis of the sampling system, when the load of the unit changes, the manual adjustment dosage cannot be satisfied in time, and the overlong online pH timing time can cause electrode passivation, so that the measurement data can cause errors for operators, the ammonia dosage cannot be accurately controlled, the water quality fluctuation is large, even under severe conditions, the corrosion, scaling and pipe explosion faults of thermodynamic system equipment can be caused, the workload of the operators is increased, and the safety and the stability of the unit are also influenced.
Disclosure of Invention
One or more embodiments of the present disclosure provide a method for automatically controlling chemical ammonia addition in a thermal power plant, including:
s1, adjusting the output of a PID controller according to the deviation of the actual value of the specific conductance of the deaerator inlet and the set value of the specific conductance of the deaerator inlet to obtain a first adjustment frequency;
s2, according to the feed water flow value, acquiring a second adjusting frequency corresponding to the current feed water flow through a function generator;
s3, adding the first adjusting frequency and the second adjusting frequency through an addition arithmetic unit to obtain a final adjusting frequency;
and S4, automatically adjusting the frequency of the water feeding ammonia pump according to the calculated final adjustment frequency, and realizing the automatic control of chemical ammonia feeding.
One or more embodiments of the present disclosure provide an automatic chemical ammonia addition control system for a thermal power plant, including:
and a PID control module: the PID controller is used for adjusting the output of the PID controller according to the deviation of the specific conductance of the deaerator inlet input to the PID controller and the specific conductance set value of the deaerator inlet;
a feed water flow control module; the system comprises a function generator, a flow meter and a flow meter, wherein the function generator is used for calculating the ammonia adding amount base number corresponding to the current water feeding flow through the current water feeding flow;
an ammonia adding pump frequency calculation module: the system comprises an addition arithmetic unit, a frequency acquisition unit and a frequency control unit, wherein the addition arithmetic unit is used for calculating the output of the PID controller and the base number of the ammonia adding amount to obtain the frequency of a final water supply ammonia adding pump;
an automatic adjustment module: the method is used for controlling the ammonia adding amount according to the calculated frequency of the water feeding ammonia pump, and realizing the automatic control of chemical ammonia adding.
By adopting the embodiment of the invention, the automation level of the unit can be improved, and the operation burden of operators is greatly reduced; the delay of sampling can be overcome, the ammonia adding amount can be accurately controlled, the stability of the specific conductance of the deaerator inlet is ensured, the unit has good dynamic response quality, and ideal regulation characteristics are obtained.
The above description is only an overview of the technical solutions of the present invention, and the present invention can be implemented in accordance with the content of the description so as to make the technical means of the present invention more clearly understood, and the above and other objects, features, and advantages of the present invention will be more clearly understood.
Drawings
In order to more clearly illustrate one or more embodiments or prior art solutions of the present specification, the drawings that are needed in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present specification, and that other drawings can be obtained by those skilled in the art without inventive exercise.
FIG. 1 is a flow chart of an automatic chemical ammonia addition control method for a thermal power plant according to one or more embodiments of the present disclosure;
FIG. 2 is a schematic diagram of a specific implementation structure of an automatic chemical ammonia adding control method for a thermal power plant according to one or more embodiments of the present disclosure;
fig. 3 is a schematic diagram of an automatic chemical ammonia adding control system of a thermal power plant according to one or more embodiments of the present disclosure.
Reference numerals:
1: condensing water; 2: specific conductance of an inlet of the deaerator; 3: a deaerator; 4: adding an ammonia pump to the water;
5: a feed pump; 6: the flow rate of the water supply; 7: a deaerator inlet specific conductance set value; 8: a first pure hysteresis operator; 9: a PID controller; 10: a second pure hysteresis operator; 11: a function generator; 12: an addition operator; 13: the frequency of the ammonia pump added to the feed water.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in one or more embodiments of the present disclosure, the technical solutions in one or more embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in one or more embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all embodiments. All other embodiments that can be derived by a person skilled in the art from one or more of the embodiments described herein without making any inventive step shall fall within the scope of protection of this document.
Method embodiment
When thermal power plant carries out chemistry and adds ammonia, add the ammonia pump through feedwater and add the condensation water of oxygen-eliminating device export and add the medicine and handle, make the specific conductance of oxygen-eliminating device entry maintain at the value of relatively stable, just so can make the water quality of the water pump export up to standard, guarantee the safety and the stability of thermodynamic system equipment. An embodiment of the present invention provides an automatic chemical ammonia addition control method for a thermal power plant, where fig. 1 is a flowchart of an automatic chemical ammonia addition control method for a thermal power plant provided in one or more embodiments of the present specification, and as shown in fig. 1, the automatic chemical ammonia addition control method for a thermal power plant according to the embodiment of the present invention specifically includes:
s1, adjusting the output of a PID controller according to the deviation of the actual value of the specific conductance of the deaerator inlet and the set value of the specific conductance of the deaerator inlet to obtain a first adjustment frequency;
specifically, the specific conductance of the deaerator inlet is firstly subjected to delayed output processing through a pure hysteresis arithmetic unit, and the output of the PID controller is adjusted according to the deviation of the specific conductance of the deaerator inlet after processing and the specific conductance set value of the deaerator inlet, and the specific method comprises the following steps:
when the specific conductance of the deaerator inlet rises, positive deviation occurs between the specific conductance of the deaerator inlet and a set value of the specific conductance of the deaerator inlet, so that the specific sequence P action and the integral I action of the PID controller start to act, and an action instruction for increasing the output of the PID controller is sent;
when the specific conductance of the deaerator inlet is reduced, a negative deviation occurs between the specific conductance of the deaerator inlet and a set value of the specific conductance of the deaerator inlet, so that the function of the PID controller in the ratio sequence P and the function of the integral I start to act, and an action instruction for reducing the output of the PID controller is sent.
S2, according to the water supply flow value, obtaining a second adjusting frequency corresponding to the current water supply flow through a function generator;
specifically, the current feed water flow value is subjected to delay output processing through a pure hysteresis arithmetic unit, the feed water flow value subjected to delay processing is input into a function generator, and a second adjusting frequency corresponding to the current feed water flow is obtained through preset parameters in the function generator.
And S3, adding the first adjusting frequency and the second adjusting frequency through an addition arithmetic unit to obtain the final adjusting frequency.
And S4, automatically adjusting the frequency of the water feeding ammonia pump according to the calculated final adjustment frequency, and realizing the automatic control of chemical ammonia feeding.
And the delay setting values of the first pure hysteresis operator and the second pure hysteresis operator are both 3-5 s.
Fig. 2 is a schematic diagram of a specific implementation structure of an automatic chemical ammonia adding control method for a thermal power plant according to one or more embodiments of the present disclosure, as shown in fig. 2, an input signal of a PID controller 9 includes two paths, one path is a specific conductance set value 7 at an inlet of a deaerator 3, the specific conductance set value is set by an operator, the other path is a specific conductance actual value 2 at an inlet of the deaerator 3 to be controlled and adjusted, the specific conductance actual value is processed by a first pure hysteresis calculator 8 and then input to the PID controller 9, the PID controller 9 includes a control function of a specific column P and an integral I, and the PID controller 9 is configured to perform small-amplitude adjustment on a deviation of the specific conductance at the inlet of the deaerator 3 and output a first adjustment frequency for operation of a water and ammonia adding pump 4. The function generator 11 and the second pure hysteresis arithmetic unit constitute a feed water flow rate control loop, and the corresponding feed water plus ammonia pump 4 frequency is obtained as the second adjustment frequency according to the value of the feed water flow rate 6. And after the adjustment frequency is calculated, adding the first adjustment frequency and the second adjustment frequency by an addition arithmetic unit 12 to obtain the final adjustment frequency of the feed water ammonia adding pump 4 as the frequency 13 of the feed water ammonia adding pump, carrying out ammonia adding treatment on the condensed water 1 output by the deaerator 3 by the feed water ammonia adding pump according to the frequency 13 of the feed water ammonia adding pump, and discharging water with the water quality reaching the standard through the feed water pump after the treatment is finished.
A pure hysteresis arithmetic unit is added to avoid the influence of signal mutation on the specific conductance and the water supply flow at the inlet of the deaerator, for example, the specific conductance or the water supply flow is suddenly changed from one value to another value in a large range, and the influence of the signal mutation is solved through the delay output of the pure hysteresis arithmetic unit; the delay time of the pure lag operator is set to 3s-5s to avoid the influence of the ammonia addition.
The corresponding relation between the feed water flow and the feed water ammonia pump frequency is obtained by the function generator 11 according to the parameters obtained by the experiment, and the specific parameters of the function generator 11 showing the feed water flow and the feed water ammonia pump frequency are shown in table 1:
Figure BDA0003659798710000051
by adopting the embodiment of the invention, the automation level of the unit can be improved, and the operation burden of operators is greatly reduced; the delay of sampling can be overcome, the ammonia adding amount can be accurately controlled, the stability of the specific conductance of the deaerator inlet is ensured, the unit has good dynamic response quality, and ideal regulation characteristics are obtained.
System embodiment
According to an embodiment of the present invention, an automatic chemical ammonia addition control system for a thermal power plant is provided, fig. 3 is a schematic diagram of a principle of an automatic chemical ammonia addition control system for a thermal power plant provided in one or more embodiments of the present specification, and as shown in fig. 3, the automatic chemical ammonia addition control system for a thermal power plant according to the embodiment of the present invention specifically includes:
the PID control module 30: the PID controller is used for adjusting the output of the PID controller according to the deviation of the specific conductance of the deaerator inlet and the specific conductance set value of the deaerator inlet.
The PID control module 30 further comprises a first pure hysteresis operator, which is connected to the PID controller and is configured to delay the specific conductance at the inlet of the deaerator and input the processed specific conductance into the PID controller.
The PID control module 30 is specifically configured to:
when the specific conductance of the deaerator inlet rises, positive deviation occurs between the specific conductance of the deaerator inlet and a set value of the specific conductance of the deaerator inlet, so that the specific sequence P action and the integral I action of the PID controller start to act, and an action instruction for increasing the output of the PID controller is sent;
when the specific conductance of the deaerator inlet is reduced, a negative deviation occurs between the specific conductance of the deaerator inlet and a set value of the specific conductance of the deaerator inlet, so that the function of the PID controller in the ratio sequence P and the function of the integral I start to act, and an action instruction for reducing the output of the PID controller is sent.
The feed water flow control module 32 includes a function generator for calculating the ammonia addition base number corresponding to the current feed water flow through the current feed water flow.
The feed water flow control module 32 further comprises a second pure hysteresis operator, which is connected to the function generator and is configured to delay the feed water flow signal and input the processed feed water flow signal to the function generator.
Ammonia pump frequency calculation module 34: the device comprises an addition arithmetic unit which is used for calculating the output of the PID controller and the base number of the ammonia adding amount to obtain the frequency of the final feed water ammonia adding pump.
The auto-adjustment module 36: the method is used for controlling the ammonia adding amount according to the calculated frequency of the water feeding ammonia pump, and realizing the automatic control of chemical ammonia adding.
Wherein the delay setting values of the first pure hysteresis operator and the second pure hysteresis operator are both 3-5 seconds.
The embodiment of the present invention is a system embodiment corresponding to the above method embodiment, and specific operations of each module may be understood with reference to the description of the method embodiment, which is not described herein again.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. An automatic control method for chemical ammonia addition in a thermal power plant is characterized by comprising the following steps:
s1, adjusting the output of a PID controller according to the deviation of the actual value of the specific conductance of the deaerator inlet and the set value of the specific conductance of the deaerator inlet to obtain a first adjustment frequency;
s2, according to the water supply flow value, obtaining a second adjusting frequency corresponding to the current water supply flow through a function generator;
s3, adding the first adjusting frequency and the second adjusting frequency through an addition arithmetic unit to obtain a final adjusting frequency;
and S4, automatically adjusting the frequency of the water feeding ammonia pump according to the calculated final adjustment frequency, and realizing the automatic control of chemical ammonia feeding.
2. The method according to claim 1, wherein the method of S1 specifically comprises: and the specific conductance of the deaerator inlet is subjected to delayed output processing through a first pure hysteresis arithmetic unit, and the output of the PID controller is adjusted according to the processed specific conductance of the deaerator inlet and the deviation of the specific conductance set value of the deaerator inlet.
3. The method of claim 1, wherein the output of the PID controller is adjusted according to the deviation between the specific conductance of the deaerator inlet and the specific conductance set value of the deaerator inlet by:
when the specific conductance of the deaerator inlet rises, positive deviation occurs between the specific conductance of the deaerator inlet and a set value of the specific conductance of the deaerator inlet, so that the specific sequence P action and the integral I action of the PID controller start to act, and an action instruction for increasing the output of the PID controller is sent;
when the specific conductance of the deaerator inlet is reduced, a negative deviation occurs between the specific conductance of the deaerator inlet and a set value of the specific conductance of the deaerator inlet, so that the function of the PID controller in the ratio sequence P and the function of the integral I start to act, and an action instruction for reducing the output of the PID controller is sent.
4. The method according to claim 1, wherein the method of S2 specifically includes:
and the current water supply flow value is subjected to delay output processing through a second pure hysteresis arithmetic unit, the water supply flow value subjected to delay processing is input into a function generator, and a second adjusting frequency corresponding to the current water supply flow is obtained through preset parameters in the function generator.
5. The method of claim 2 or 4, wherein the delay settings of the first and second pure hysteresis operators are 3-5 s.
6. An automatic chemical ammonia adding control system for a thermal power plant is characterized by comprising:
and a PID control module: the PID controller is used for adjusting the output of the PID controller according to the deviation of the specific conductance of the deaerator inlet input to the PID controller and the specific conductance set value of the deaerator inlet;
a feed water flow control module; the system comprises a function generator, a flow meter and a flow meter, wherein the function generator is used for calculating the ammonia adding amount base number corresponding to the current water feeding flow through the current water feeding flow;
an ammonia adding pump frequency calculation module: the system comprises an addition arithmetic unit, a frequency acquisition unit and a frequency control unit, wherein the addition arithmetic unit is used for calculating the output of the PID controller and the base number of the ammonia adding amount to obtain the frequency of a final water supply ammonia adding pump;
an automatic adjustment module: the method is used for controlling the ammonia adding amount according to the calculated frequency of the water feeding ammonia pump, and realizing the automatic control of chemical ammonia adding.
7. The system of claim 6, wherein the PID control module further comprises a first pure hysteresis operator, and the first pure hysteresis operator is connected with the PID controller and is used for delaying the specific conductance of the deaerator inlet and inputting the processed specific conductance into the PID controller.
8. The system of claim 6, wherein the feedwater flow control module further comprises a second pure hysteresis operator, the second pure hysteresis operator being connected to the function generator and configured to delay the feedwater flow signal and input the processed feedwater flow signal to the function generator.
9. The system of claim 6, wherein the PID control module is specifically configured to:
when the specific conductance of the deaerator inlet rises, positive deviation occurs between the specific conductance of the deaerator inlet and a set value of the specific conductance of the deaerator inlet, so that the specific sequence P action and the integral I action of the PID controller start to act, and an action instruction for increasing the output of the PID controller is sent;
when the specific conductance of the deaerator inlet is reduced, a negative deviation occurs between the specific conductance of the deaerator inlet and a set value of the specific conductance of the deaerator inlet, so that the function of the PID controller in the ratio sequence P and the function of the integral I start to act, and an action instruction for reducing the output of the PID controller is sent.
10. The system of claim 7 or 8, wherein the delay settings of the first and second pure hysteresis operators are each 3-5 seconds.
CN202210573469.9A 2022-05-24 2022-05-24 Automatic control method and system for chemical ammonia addition of thermal power plant Pending CN114956219A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1321679A1 (en) * 1986-01-13 1987-07-07 Новолипецкий металлургический комбинат им.Ю.В.Андропова Automatic device for controlling process for ammonia synthesis
CN104238520A (en) * 2014-09-18 2014-12-24 安徽新力电业科技咨询有限责任公司 Supercritical boiler fire coal heat value self-balance control loop distributed control system implementation method
CN105759712A (en) * 2016-04-05 2016-07-13 西安西热电站化学科技有限公司 Precise control device and method for condensation water automatic ammonia injection
CN207738501U (en) * 2017-12-05 2018-08-17 齐越 A kind of boiler feedwater pH value self-checking device
CN110217900A (en) * 2019-04-18 2019-09-10 西安热工研究院有限公司 A kind of automatic oxygenation of power plant water supply and the collaboration precise control device and method of ammonification
CN113847594A (en) * 2021-11-08 2021-12-28 西安热工研究院有限公司 Automatic control system and method for main steam temperature of subcritical thermal power generating unit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1321679A1 (en) * 1986-01-13 1987-07-07 Новолипецкий металлургический комбинат им.Ю.В.Андропова Automatic device for controlling process for ammonia synthesis
CN104238520A (en) * 2014-09-18 2014-12-24 安徽新力电业科技咨询有限责任公司 Supercritical boiler fire coal heat value self-balance control loop distributed control system implementation method
CN105759712A (en) * 2016-04-05 2016-07-13 西安西热电站化学科技有限公司 Precise control device and method for condensation water automatic ammonia injection
CN207738501U (en) * 2017-12-05 2018-08-17 齐越 A kind of boiler feedwater pH value self-checking device
CN110217900A (en) * 2019-04-18 2019-09-10 西安热工研究院有限公司 A kind of automatic oxygenation of power plant water supply and the collaboration precise control device and method of ammonification
CN113847594A (en) * 2021-11-08 2021-12-28 西安热工研究院有限公司 Automatic control system and method for main steam temperature of subcritical thermal power generating unit

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