CN115974251A - Thermodynamic system water supply and ammonia addition control system and method - Google Patents
Thermodynamic system water supply and ammonia addition control system and method Download PDFInfo
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- CN115974251A CN115974251A CN202211729253.3A CN202211729253A CN115974251A CN 115974251 A CN115974251 A CN 115974251A CN 202211729253 A CN202211729253 A CN 202211729253A CN 115974251 A CN115974251 A CN 115974251A
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 122
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000003044 adaptive effect Effects 0.000 claims abstract description 35
- 239000003245 coal Substances 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 238000011084 recovery Methods 0.000 claims abstract description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 19
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 2
- 238000001139 pH measurement Methods 0.000 claims description 2
- 230000006872 improvement Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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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Abstract
The invention discloses a water supply and ammonia adding control system and method for a thermodynamic system, belonging to the technical field of thermodynamic system ammonia adding control, and the device comprises: the system comprises a PLC (programmable logic controller), an ammonia tank, a first pipeline communicated with an outlet of a deaerator of a boiler water supply system, and a second pipeline communicated with an inlet of a boiler water supply economizer of a thermodynamic system; a first pipeline of the ammonia tank communicated with the outlet of the deaerator is provided with a feed water and ammonia adding pump; a sampling pipeline connected with the second pipeline is connected with a pH sensor and then discharged into a recovery tank; the PLC is electrically connected with a water feeding ammonia pump and a coal economizer inlet pH sensor. The PLC is connected with a water supply ammonia adding pump and a coal economizer inlet pH sensor, the adjusting frequency of the water supply ammonia adding pump at the moment is calculated by using a model-free adaptive control algorithm, and the water supply ammonia adding amount is dynamically adjusted. The device ensures the stability of the pH value of the inlet of the water supply economizer of the thermodynamic system, namely, the control requirement of the ammonia addition of the feedwater of the thermodynamic system is met.
Description
Technical Field
The invention relates to the technical field of thermodynamic system ammonia adding control, in particular to a thermodynamic system water supply ammonia adding control system and method.
Background
The technology of feeding water and ammonia in a thermodynamic system is an important part in a chemical system of a power plant, and ammonia water with certain content is added into a water feeding pipeline to improve the pH value of a water feeding system, so that the technology is used as a practical method for preventing metal corrosion. However, the part of the thermodynamic system for feeding the water and the ammonia has large hysteresis characteristic and is accompanied with load fluctuation, so that the pH value of the fed water is difficult to control manually and accurately, the operation difficulty of operators is increased, and a certain equipment corrosion risk exists in a boiler water feeding pipeline.
How to control the ammonia feeding of the water supply of the thermodynamic system becomes a problem to be solved urgently.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a water supply and ammonia addition control system and method for a thermodynamic system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a thermodynamic system feedwater ammoniation control system comprising: the system comprises a PLC (programmable logic controller), an ammonia tank, a first pipeline communicated with an outlet of a deaerator of a boiler water supply system, and a second pipeline communicated with an inlet of a boiler water supply economizer of a thermodynamic system;
a first pipeline of the ammonia tank communicated with the outlet of the deaerator is provided with a feed water and ammonia adding pump; a sampling pipeline connected with the second pipeline is connected with a pH sensor and then discharged into a recovery tank;
the PLC is electrically connected with a water feeding ammonia pump and a coal economizer inlet pH sensor.
As a further improvement of the invention, the PLC is connected with a touch display screen.
As a further improvement of the invention, a water supply ammonia adding manual door is arranged on an outlet pipeline of the water supply ammonia adding pump.
As a further improvement of the invention, the PLC controller comprises a model-free self-adaptive module, the model-free self-adaptive module is used for comparing and controlling the actual value of the pH value at the inlet of the economizer with an expected value, and the frequency of the feed water ammonia adding pump is dynamically adjusted by utilizing the data driving function of the model-free self-adaptive module so as to control the pH value of the feed water of the thermodynamic system to reach the expected value.
As a further improvement of the present invention, the control method of the model-free adaptive control module comprises:
if it is used
Or Δ u (k-1). Ltoreq.ε or ≦ E>
Where ε is a very small positive number, ρ and η represent step-size factors, λ and μ are penalty factors, and the effect isLimiting the increment of the control quantity, wherein y * (k + 1) is the expected value of the economizer inlet pH, and y (k) is the sampled real-time value of the economizer inlet pH; u (k) is used as the output of the model-free adaptive control algorithm and directly acts on the feed water ammonia adding pump.
A control method for feeding ammonia to water in a thermodynamic system comprises the following steps:
setting a pH expected value at an inlet of the economizer, and starting a condensed water ammonia adding pump; and calculating the difference value between the pH sampling value of the coal economizer inlet and the expected value, and then passing through a model-free adaptive control module of the PLC, wherein the model-free adaptive control module dynamically adjusts the frequency of the water supply ammonia pump, so that the pH value of the water supply of the thermodynamic system is controlled to reach the expected value.
As a further improvement of the invention, the calculation of the difference between the pH sampled value and the desired value comprises:
and adding an online pH meter at the inlet of the economizer, carrying out online pH measurement on boiler feed water, and converting the pH value into the pH value of the feed water through a formula of pH =8.57+ lgSC, wherein SC is an online measured value of the conductivity of the internal cooling water.
As a further improvement of the present invention, the control method of the model-free adaptive control module comprises:
if it is not
Or Δ u (k-1). Ltoreq.ε or ≦ E>
Where ε is a very small positive number, ρ and η represent step-size factors, λ and μ are penalty factors, and the effect is to limit the increment of the control quantity, where y * (k + 1) is the economizer inlet pH expected value, y (k) is the economizer inlet pH sampled real-time value; u (k) is used as the output of the model-free adaptive control algorithm and directly acts on the feed water ammonia adding pump.
Compared with the prior art, the invention has the following advantages:
according to the invention, ammonia water is added to a boiler water supply pipeline by using a water supply ammonia adding pump at the outlet of the deaerator. The sampling part is designed at the inlet of the economizer and is additionally provided with an online pH meter, and a PLC (programmable logic controller) uses a model-free self-adaptive algorithm; the PLC is electrically connected with a water feeding ammonia pump and a coal economizer inlet pH sensor. The PLC is connected with a water supply ammonia adding pump and a coal economizer inlet pH sensor, the adjusting frequency of the water supply ammonia adding pump at the moment is calculated by using a model-free adaptive control algorithm, and the water supply ammonia adding amount is dynamically adjusted. The device ensures the stability of the pH value of the inlet of the water supply economizer of the thermodynamic system, namely, the control requirement of the ammonia addition of the feedwater of the thermodynamic system is met. The hysteresis of the boiler water supply ammonia adding system is reduced, manual intervention is not needed, the model-free adaptive algorithm can dynamically change the frequency of the water supply ammonia adding pump according to set control parameters, and therefore the ammonia adding amount of the water supply of the thermodynamic system is accurately changed according to the change of the working condition of the water supply system of the thermodynamic system. The device is simple and practical and controls the pH accuracy of the water supply of the thermodynamic system to be high, thereby ensuring the stability of the pH value of the water supply of the thermodynamic system and meeting the requirement of the pH value of the water supply of the thermodynamic system.
Furthermore, the method solves the problem of large hysteresis of the heating power system in water supply and ammonia addition, and the model-free adaptive control algorithm used in the PLC controller obtains the optimal output value of the model-free adaptive controller, dynamically adjusts the frequency of the water supply and ammonia addition pump, reduces the workload of operators, and ensures the safety and the economy of the heating power system in operation.
Drawings
FIG. 1 is a water supply and ammonia adding device for a thermodynamic system, which is provided by the invention;
FIG. 2 is a model-free adaptive control method for water supply and ammonia addition of a thermodynamic system.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides a thermodynamic system feedwater ammoniation control system, including: the system comprises a PLC (programmable logic controller) 5, a first pipeline and a second pipeline, wherein the ammonia water tank 1 is communicated with an outlet of a deaerator of a boiler water supply system, and the second pipeline is communicated with an inlet of a boiler water supply economizer of a thermodynamic system;
the first pipeline of the ammonia water tank 1 communicated with the outlet of the deaerator sequentially comprises a water feeding and ammonia adding pump 2 and a water feeding and ammonia adding manual valve 3; the sampling pipeline at the inlet of the coal economizer is connected with a pH sensor 6 and then discharged into a recovery tank.
The PLC 5 is connected with a water feeding ammonia pump 2 and an economizer inlet pH sensor 6.
The PLC 5 is connected with the touch display screen 4. The touch display screen 4 can be used for data input, data interaction, display and conventional control operation. For example, the economizer inlet pH desired value may be set on the touch screen 4 and the condensate plus ammonia pump 2 may be started.
The PLC comprises a model-free self-adaptive module for comparing and controlling the actual value and the expected value of the pH value at the inlet of the economizer, and dynamically adjusting the frequency of the feed water ammonia adding pump 2 by utilizing the data driving function of the PLC so as to control the pH value of feed water of the thermodynamic system to reach the expected value.
The core principle of the invention is as follows: the PLC is connected with the feed water ammonia adding pump 2 and the economizer inlet pH sensor, the adjusting frequency of the feed water ammonia adding pump 2 at the moment is calculated by using a model-free adaptive control algorithm, and the feed water ammonia adding amount is dynamically adjusted. The device ensures the stability of the pH value of the inlet of the water supply economizer of the thermodynamic system, namely, the control requirement of the ammonia addition of the feedwater of the thermodynamic system is met.
The invention also provides an intelligent algorithm control method for feeding ammonia to the water of the thermodynamic system, which comprises the following steps:
the pH expected value of the coal economizer inlet is set on the touch screen 4, and the condensed water ammonia adding pump 2 is started. And calculating the difference value between the pH sampling value of the economizer inlet and the expected value, and then passing through a model-free adaptive control module to obtain the feed water ammonia pump 2 at the moment, so that the pH value of the feed water economizer inlet of the thermodynamic system is controlled to reach the expected value.
The method solves the problem of large hysteresis of the heating power system in water supply and ammonia addition, and the model-free adaptive control algorithm used in the PLC is provided with parameters including a proportional coefficient P, an integral coefficient I and a differential coefficient D, so that the optimal output value of the model-free adaptive controller is obtained, the frequency of the water supply and ammonia addition pump is dynamically adjusted, the workload of operators is reduced, and the safety and the economy of the heating power system in operation are ensured.
The boiler feed water is subjected to pH on-line measurement and converted into feed water pH value through the formula pH =8.57+ lgSC.
The model-free adaptive algorithm needs to be implemented by means of SCL programming statements in STEP7 programming software of siemens S7-300.
The model-free adaptive control does not depend on accurate mathematical model information of the object, and the realization of the controller is completed by utilizing the online I/O data or the offline I/O data of the controlled object. When the current controlled object model changes, the model-free adaptive controller can change the parameters of the model-free adaptive controller, so that the adaptive function of the model-free adaptive controller is realized. The MFAC is provided on the basis of a 'universal model' and a pseudo partial derivative, and after a controlled object is replaced by the discretized 'universal model', the solution of the pseudo partial derivative of the 'universal model' is completed by using online I/O data of the controlled object. Through the change of the pseudo partial derivative, the adaptive adjustment process of the MFAC is realized. The MFAC only needs I/O data of a controlled object, does not need internal information of the structure and the order of the controlled object, and provides great convenience for the realization of a model-free adaptive controller.
The model-free self-adaptive control scheme comprises the following steps:
if it is not
Or Δ u (k-1). Ltoreq.ε or ≦ E>
In the above formula, ε is a very small positive number, ρ and η represent step-size factors, λ and μ are penalty factors, and the effect is to limit the increment of the control quantity, where y * (k + 1) is the expected value of the economizer inlet pH, and y (k) is the sampled real-time value of the economizer inlet pH. u (k) is used as the output of the model-free adaptive control algorithm and directly acts on the water supply ammonia adding pump 2 to realize the automatic control of water supply ammonia adding.
By designing the model-free adaptive controller, it can be seen from the above equation that the controller uses only the I/O data of the system, without any information about the model structure. The characteristic of the model-free adaptive controller is that the adaptive change of the pseudo partial derivative plays a decisive role in the control quantity of the controller in the control process.
The following description will further describe an embodiment of the present invention with reference to fig. 1 and 2.
Examples
As shown in figure 1, when the water supply and ammonia adding device of the thermodynamic system is put into operation, a water supply and ammonia adding manual door is opened, a pH value expected by an economizer inlet is set on a touch display screen 4, and then a condensed water and ammonia adding pump 2 is started, so that the water supply and ammonia adding device of the thermodynamic system can be put into operation automatically.
As shown in the attached figure 2, parameters of the economizer inlet pH model-free adaptive algorithm are adjusted, wherein p and eta represent step-size factors, and lambda and mu are penalty factors and economizer inlet pH expected values, so that the economizer inlet pH has an automatic control function, namely, the control requirement of the thermodynamic system on water feeding and ammonia adding is met.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (8)
1. A thermodynamic system feedwater ammoniation control system, characterized by comprising: the system comprises a PLC (programmable logic controller) (5), an ammonia water tank (1), a first pipeline communicated with an outlet of a deaerator of a boiler water supply system, and a second pipeline communicated with an inlet of a boiler water supply economizer of a thermodynamic system;
a first pipeline of the ammonia tank (1) communicated with the outlet of the deaerator is provided with a feed water and ammonia adding pump (2); a sampling pipeline connected with the second pipeline is connected with a pH sensor (6) and then discharged into a recovery tank;
the PLC (5) is electrically connected with the water feeding ammonia pump (2) and the coal economizer inlet pH sensor (6).
2. A thermodynamic system water feed ammoniation control system as claimed in claim 1,
the PLC (5) is connected with the touch display screen (4).
3. A thermodynamic system water feed ammoniation control system as claimed in claim 1,
and a water supply ammonia adding manual door (3) is arranged on an outlet pipeline of the water supply ammonia adding pump (2).
4. A thermodynamic system water feed ammoniation control system as claimed in claim 1,
the PLC controller comprises a model-free self-adaptive module, the model-free self-adaptive module is used for comparing and controlling the actual pH value of the inlet of the economizer with an expected value, and the frequency of the feed water ammonia adding pump (2) is dynamically adjusted by utilizing the data driving function of the PLC controller so as to control the pH value of feed water of the thermodynamic system to reach the expected value.
5. A thermodynamic system water feed ammoniation control system as claimed in claim 4,
the control method of the model-free adaptive control module comprises the following steps:
if it is used
Or | Δ u (k-1) | ≦ ε or |>
Where ε is a very small positive number, ρ and η represent step-size factors, λ and μ are penalty factors, and the effect is to limit the increment of the control quantity, where y * (k + 1) is the economizer inlet pH expected value, y (k) is the economizer inlet pH sampled real-time value; u (k) is used as the output of the model-free adaptive control algorithm and directly acts on the feed water ammonia adding pump.
6. A control method for feeding ammonia to water of a thermodynamic system is characterized by comprising the following steps:
setting an expected value of the pH value at the inlet of the economizer, and starting a condensed water ammonia adding pump; and calculating the difference value between the pH sampling value of the coal economizer inlet and the expected value, and then passing through a model-free adaptive control module of the PLC, wherein the model-free adaptive control module dynamically adjusts the frequency of the water supply ammonia pump, so that the pH value of the water supply of the thermodynamic system is controlled to reach the expected value.
7. The thermodynamic system feedwater ammoniation control method as claimed in claim 6,
calculating the difference between the pH sampling value and the expected value comprises the following steps:
and adding an online pH meter at the inlet of the economizer, carrying out online pH measurement on boiler feed water, and converting the pH value into the pH value of the feed water through a formula of pH =8.57+ lgSC, wherein SC is an online measured value of the conductivity of the internal cooling water.
8. The thermodynamic system water ammoniation control method as claimed in claim 6,
the control method of the model-free adaptive control module comprises the following steps:
if it is not
Or | Δ u (k-1) | ≦ ε or |>
Where ε is a very small positive number, ρ and η represent step-size factors, λ and μ are penalty factors, and the effect is to limit the increment of the control quantity, where y * (k + 1) is the expected value of the economizer inlet pH, and y (k) is the sampled real-time value of the economizer inlet pH; u (k) is used as the output of the model-free adaptive control algorithm and directly acts on the feed water ammonia adding pump.
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| CN202211729253.3A CN115974251A (en) | 2022-12-30 | 2022-12-30 | Thermodynamic system water supply and ammonia addition control system and method |
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| CN202211729253.3A CN115974251A (en) | 2022-12-30 | 2022-12-30 | Thermodynamic system water supply and ammonia addition control system and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04268101A (en) * | 1991-02-20 | 1992-09-24 | Babcock Hitachi Kk | Controlling method for injection rate of chemical in water supply system of boiler |
| CN201526951U (en) * | 2009-09-23 | 2010-07-14 | 长沙理工大学 | Automatic ammoniating device of power station boiler |
| CN207738501U (en) * | 2017-12-05 | 2018-08-17 | 齐越 | A kind of boiler feedwater pH value self-checking device |
| CN110182924A (en) * | 2019-06-04 | 2019-08-30 | 西安热工研究院有限公司 | Automatically method is ammoniated with ammonia with ammonia ammonification integrative machine and automatically |
| CN209853816U (en) * | 2019-05-06 | 2019-12-27 | 山东华星石油化工集团有限公司 | Automatic PH control device for deaerated water of catalytic device deaerator |
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2022
- 2022-12-30 CN CN202211729253.3A patent/CN115974251A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04268101A (en) * | 1991-02-20 | 1992-09-24 | Babcock Hitachi Kk | Controlling method for injection rate of chemical in water supply system of boiler |
| CN201526951U (en) * | 2009-09-23 | 2010-07-14 | 长沙理工大学 | Automatic ammoniating device of power station boiler |
| CN207738501U (en) * | 2017-12-05 | 2018-08-17 | 齐越 | A kind of boiler feedwater pH value self-checking device |
| CN209853816U (en) * | 2019-05-06 | 2019-12-27 | 山东华星石油化工集团有限公司 | Automatic PH control device for deaerated water of catalytic device deaerator |
| CN110182924A (en) * | 2019-06-04 | 2019-08-30 | 西安热工研究院有限公司 | Automatically method is ammoniated with ammonia with ammonia ammonification integrative machine and automatically |
Non-Patent Citations (1)
| Title |
|---|
| 陈煜路: "基于学习的无模型自适应控制策略的研究", 中国优秀硕士学位论文全文数据库信息科技辑, 15 August 2019 (2019-08-15), pages 5 - 9 * |
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