CN112323073A - Anticorrosion and antiscaling integrated control system and control method for thermal equipment of power plant - Google Patents
Anticorrosion and antiscaling integrated control system and control method for thermal equipment of power plant Download PDFInfo
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- CN112323073A CN112323073A CN202011234709.XA CN202011234709A CN112323073A CN 112323073 A CN112323073 A CN 112323073A CN 202011234709 A CN202011234709 A CN 202011234709A CN 112323073 A CN112323073 A CN 112323073A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F15/00—Other methods of preventing corrosion or incrustation
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
- G05D11/139—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring a value related to the quantity of the individual components and sensing at least one property of the mixture
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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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- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
An anticorrosion and antiscale integrated control system for thermodynamic equipment of a power plant and a control method thereof are disclosed, wherein the system comprises an online conductivity meter arranged on an economizer inlet pipeline, and online dissolved oxygen meters are arranged on a deaerator inlet, an economizer inlet and a high-pressure drainage pipeline. When the measured value of the online dissolved oxygen meter at the inlet of the economizer is lower than the lower limit of a set value or higher than the upper limit of the set value, the PLC controller increases or decreases the ammonia adding amount on the condensate fine treatment outlet main pipe, and when the measured value of the online dissolved oxygen meter at the inlet of the economizer is lower than the lower limit of the set value or higher than the upper limit of the set value, the PLC controller increases or decreases the oxygen adding amount of the feed water on the downcomer of the deaerator, so that the dissolved oxygen and the direct conductivity at the inlet of the economizer are both in the optimal control range; when the dissolved oxygen of the high-pressure-plus-hydrophobic pipeline is lower than the lower limit value or higher than the upper limit value, the PLC increases or decreases the oxygen adding amount on the high-pressure-plus-hydrophobic pipeline, so that the oxygen content of the high-pressure-plus-hydrophobic pipeline is in a control range. And the integrated control of corrosion prevention and scale prevention of the thermal equipment is realized.
Description
Technical Field
The invention relates to the field of corrosion prevention and scale prevention of power plant thermodynamic equipment, in particular to a corrosion prevention and scale prevention integrated control system and a control method for the power plant thermodynamic equipment.
Background
At present, a power plant has a plurality of units which adopt chemical water working condition AVT full-volatilization treatment, the pH value of feed water at the inlet of an economizer is controlled to be more than 9.2 by adding ammonia water, and Fe of a carbon steel surface protective film is reduced under the condition of hydrazine deoxidation3O4Solubility, thereby inhibiting corrosion. However, AVT operation has significant drawbacks. The supercritical (super) critical unit adopts full volatilization treatment for water supply, and Fe is formed on the surface of metal3O4The protective film is loose, has high solubility and poor protectiveness, and causes a series of problems, such as high iron content of corrosion products in water vapor and water-cooled wallsThe scaling rate is high, the pressure difference of the boiler rises quickly, a water cooling wall throttling hole and a high pressure drainage regulating valve are blocked, the fine treatment operation period is short, the mixed bed regeneration is frequent, and the like, so that the safety and the economy of the unit operation are seriously influenced.
The fundamental method for solving the problems is to form compact Fe on the surface of the metal by adopting oxygen addition treatment OT2O3The protective film has very strong passivation protection effect on water vapor system pipelines and thermal equipment. However, it is necessary to study how to control the addition of oxygen and ammonia in the optimum range, and to match the oxygen and ammonia according to the index, so as to automatically adjust the respective addition amount, thereby realizing the integration of corrosion prevention and scale prevention of the thermodynamic equipment.
Therefore, an anticorrosion and antiscale integrated control system and a control method for the thermal equipment of the power plant are developed, so that the operation safety and economy of a unit can be obviously improved, and the chemical operation control level is improved.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide an anticorrosion and antiscaling integrated control system and a control method for thermodynamic equipment of a power plant, wherein a PLC (programmable logic controller) is adopted to read the measured value of an online instrument: the PLC controller sends out an instruction to automatically adjust the oxygen adding amount and the ammonia adding amount according to the optimal range of the dissolved oxygen and the ammonia content, thereby reducing the corrosion and the scaling of thermodynamic equipment to the maximum extent.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an anticorrosion and antiscale integrated control system for thermodynamic equipment of a power plant comprises a deaerator inlet online dissolved oxygen meter 1 arranged on an inlet pipeline of a deaerator, an economizer inlet online conductivity meter 2 arranged on the economizer inlet pipeline, an economizer inlet online dissolved oxygen meter 3, a high-pressure and hydrophobic online dissolved oxygen meter 4 arranged on a high-pressure and hydrophobic pipeline, a condensate fine treatment outlet oxygenation point 6 on a condensate fine treatment outlet main pipe, a deaerator downcomer feedwater oxygenation point 7 on a deaerator downcomer, a high-pressure and hydrophobic oxygenation point 8 on the high-pressure and hydrophobic pipeline, a condensate fine treatment outlet ammoniation point 9 on the condensate fine treatment outlet main pipe, and a PLC (programmable logic controller) 5, wherein the PLC 5 is connected with the deaerator inlet online dissolved oxygen meter 1, the economizer inlet online conductivity meter 2, the economizer inlet online dissolved oxygen meter 3 and the high-pressure and hydrophobic online dissolved oxygen meter 4 and receives measurement signals of the meters, the PLC controller 5 is connected with a condensate fine treatment outlet oxygenation point 6, a deaerator downcomer water supply oxygenation point 7, a high-pressure-added hydrophobic oxygenation point 8 and a condensate fine treatment outlet ammonia addition point 9, and automatically controls the change of oxygen addition and ammonia addition.
According to the control method of the anticorrosion and antiscale integrated control system for the thermal equipment of the power plant, oxygenation and ammoniation of a water vapor system are carried out simultaneously and complementarily, when the measured value of an online dissolved oxygen meter 3 at the inlet of an economizer is lower than the lower limit of a set value, the PLC 5 increases the ammoniation amount on a condensate polishing outlet main pipe, and when the measured value of the online dissolved oxygen meter 3 at the inlet of the economizer is higher than the upper limit of the set value, the PLC 5 decreases the ammoniation amount on the condensate polishing outlet main pipe; when the measured value of the economizer inlet on-line conductivity meter 2 is lower than the lower limit of a set value, the PLC 5 increases the feed water oxygen addition amount on the deaerator downcomer, and when the measured value of the economizer inlet on-line conductivity meter 2 is higher than the upper limit of the set value, the PLC 5 reduces the feed water oxygen addition amount on the deaerator downcomer, so that the dissolved oxygen and the direct conductivity of the economizer inlet are both in the optimal control range; in addition, when the dissolved oxygen of the high-pressure-increased hydrophobic pipeline is lower than the lower limit value or higher than the upper limit value, the PLC 5 increases or decreases the oxygen adding amount on the high-pressure-increased hydrophobic pipeline, so that the oxygen content of the high-pressure-increased hydrophobic pipeline is in a control range, and the high-pressure-increased hydrophobic system is also at the optimal anticorrosion passivation level.
According to the control method, the control standards of the economizer inlet online conductivity meter 2, the economizer inlet online dissolved oxygen meter 3 and the high-pressure-plus-hydrophobicity online dissolved oxygen meter 4 respectively meet the following indexes: the lower control limit of the conductivity of the inlet of the coal economizer is 0.9 mu S/cm, the upper control limit is 5.4 mu S/cm, and the pH value of the inlet of the coal economizer is 8.5-9.3; the lower limit of the dissolved oxygen at the inlet of the economizer is 10 mug/L, the upper limit of the dissolved oxygen is 50 mug/L, the lower limit of the high-pressure hydrophobic dissolved oxygen is 5 mug/L, and the upper limit of the dissolved oxygen is 300 mug/L.
According to the control method, in order to ensure that the ammonia content of the water vapor system is uniform and easy to control, ammonia is added only a little through the condensate fine treatment outlet main pipe after the unit is oxygenated, and the feed water ammonia adding pump of the deaerator downcomer does not need to be put into operation under the oxygenation treatment working condition.
Compared with the prior art, the invention has the following advantages:
(1) compared with AVT water working condition control indexes, the dissolved oxygen control range of the economizer inlet is greatly reduced, steam is basically free of oxygen after oxygen addition, and the risk that the concentrated peeling of oxide skin possibly caused by high-concentration oxygen of the steam is avoided.
(2) The PLC controller receives signals and sends instructions, the corrosion-prevention and scale-prevention integrated control system is efficient and stable, reliability is high, the PLC controller enables the conductivity of the inlet of the economizer and dissolved oxygen to be kept in respective indexes, and when the dissolved oxygen or the conductivity is out of a control range, a compensation matching relation is formed between the water supply oxygenation and the ammonia feeding of a fine treatment outlet, so that the optimal corrosion-prevention and scale-prevention effect is achieved.
(3) The control range of the conductivity of the inlet of the economizer is greatly reduced, so that the ammonia content of a water vapor system is low, the acid consumption and alkali consumption for regeneration of the mixed bed are low, the consumption of desalted water is saved, and the periodic water production amount of hydrogen type operation of the mixed bed is 1-3 times of that of AVT (automatic voltage test) working conditions.
Drawings
FIG. 1 is a schematic diagram of a control system according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1, the anticorrosion and antiscale integrated control system for the thermodynamic equipment of the power plant comprises a deaerator inlet online dissolved oxygen meter 1 arranged at the deaerator inlet, an economizer inlet online conductivity meter 2, an economizer inlet online dissolved oxygen meter 3, a high-pressure and hydrophobic online dissolved oxygen meter 4 arranged on a high-pressure and hydrophobic pipeline, a condensate fine treatment outlet oxygenation point 6 on a condensate fine treatment outlet main pipe, a deaerator downcomer feedwater oxygenation point 7 on a deaerator downcomer, a high-pressure and hydrophobic oxygenation point 8 on the high-pressure and hydrophobic pipeline, a condensate fine treatment outlet ammoniation point 9 on a condensate fine treatment outlet main pipe, and a PLC controller 5, wherein the PLC controller 5 is connected with the deaerator inlet online dissolved oxygen meter 1, the economizer inlet online conductivity meter 2, the economizer inlet online dissolved oxygen meter 3 and the high-pressure and hydrophobic online dissolved oxygen meter 4 receive measurement signals of the meters, the PLC controller 5 is connected with a condensate fine treatment outlet oxygenation point 6, a deaerator downcomer water supply oxygenation point 7, a high-pressure-added hydrophobic oxygenation point 8 and a condensate fine treatment outlet ammonia addition point 9, and automatically controls the change of oxygen addition and ammonia addition.
The specific implementation method of the control system of the anticorrosion and antiscale integrated control system of the thermal equipment of the power plant comprises the following steps: when the measured value of the on-line dissolved oxygen meter 3 at the inlet of the economizer is lower than the lower limit of a set value by 10 mug/L, the PLC controller 5 increases the ammonia adding amount on the condensate polishing outlet main pipe, and when the measured value of the on-line dissolved oxygen meter 3 at the inlet of the economizer is higher than the upper limit of the set value by 50 mug/L, the PLC controller 5 decreases the ammonia adding amount on the condensate polishing outlet main pipe; when the measured value of the economizer inlet on-line conductivity meter 2 is lower than the lower limit of a set value by 0.9 mu S/cm, the PLC 5 increases the feed water oxygen adding amount on the deaerator downcomer, and when the measured value of the economizer inlet on-line conductivity meter 2 is higher than the upper limit of the set value by 5.4 mu S/cm, the PLC 5 reduces the feed water oxygen adding amount on the deaerator downcomer, so that the dissolved oxygen at the economizer inlet and the direct conductivity are both in the optimal control range; in addition, when the dissolved oxygen of the high pressure hydrophobic system is lower than the lower limit value of 5 mug/L or higher than the upper limit value of 300 mug/L, the PLC 5 increases or decreases the oxygen adding amount on the high pressure hydrophobic pipeline, so that the oxygen content of the high pressure hydrophobic system is in the control range, and the high pressure hydrophobic system is also at the optimal anticorrosion passivation level.
Claims (4)
1. An anticorrosive scale control integration control system of power plant thermodynamic equipment which characterized in that: the device comprises a deaerator inlet online dissolved oxygen meter (1) arranged on a deaerator inlet pipeline, a deaerator inlet online dissolved oxygen meter (2) and a deaerator inlet online dissolved oxygen meter (3) arranged on a deaerator inlet pipeline, a high-pressure-plus-drainage online dissolved oxygen meter (4) arranged on a high-pressure-plus-drainage pipeline, a condensate fine treatment outlet oxygenation point (6) on a condensate fine treatment outlet main pipe, a deaerator downcomer feedwater oxygenation point (7) on a deaerator downcomer, a high-pressure-plus-drainage oxygenation point (8) on the high-pressure-plus-drainage pipeline, a condensate fine treatment outlet ammoniation point (9) on the condensate fine treatment outlet main pipe, and a PLC (5), wherein the PLC (5) is connected with the deaerator inlet online dissolved oxygen meter (1), the deaerator inlet online dissolved oxygen meter (2), the deaerator inlet online dissolved oxygen meter (3) and the high-pressure-plus-drainage online dissolved oxygen meter (4) and receives measuring signals of the meters, the PLC (5) is connected with a condensate fine treatment outlet oxygenation point (6), a deaerator downcomer feed water oxygenation point (7), a high-pressure-and-drainage oxygenation point (8) and a condensate fine treatment outlet ammonia addition point (9) and automatically controls the change of oxygen addition and ammonia addition.
2. The control method of the anticorrosion and antiscale integrated control system of the thermal equipment of the power plant as claimed in claim 1, is characterized in that: the oxygen adding and the ammonia adding of the water vapor system are carried out simultaneously and complementarily, when the measured value of the online dissolved oxygen meter (3) at the inlet of the economizer is lower than the lower limit of a set value, the PLC (5) increases the ammonia adding amount on the condensate fine treatment outlet main pipe, and when the measured value of the online dissolved oxygen meter (3) at the inlet of the economizer is higher than the upper limit of the set value, the PLC (5) reduces the ammonia adding amount on the condensate fine treatment outlet main pipe; when the measured value of the economizer inlet on-line conductivity meter (2) is lower than the lower limit of a set value, the PLC (5) increases the oxygen adding amount of the feed water on the deaerator downcomer, and when the measured value of the economizer inlet on-line conductivity meter (2) is higher than the upper limit of the set value, the PLC (5) reduces the oxygen adding amount of the feed water on the deaerator downcomer, so that the dissolved oxygen and the direct conductivity of the economizer inlet are both in the optimal control range; in addition, when the dissolved oxygen of the high-pressure-plus-hydrophobic pipeline is lower than the lower limit value or higher than the upper limit value, the PLC (5) increases or decreases the oxygen adding amount on the high-pressure-plus-hydrophobic pipeline, so that the content of the oxygen of the high-pressure-plus-hydrophobic pipeline is in a control range, and the high-pressure-plus-hydrophobic system is also at the optimal anticorrosion passivation level.
3. The control method according to claim 2, characterized in that: the control standards of the economizer inlet online conductivity meter (2), the economizer inlet online dissolved oxygen meter (3) and the high-pressure-plus-hydrophobicity online dissolved oxygen meter (4) respectively meet the following indexes: the lower control limit of the conductivity of the inlet of the coal economizer is 0.9 mu S/cm, the upper control limit is 5.4 mu S/cm, and the pH value of the inlet of the coal economizer is 8.5-9.3; the lower limit of the dissolved oxygen at the inlet of the economizer is 10 mug/L, the upper limit of the dissolved oxygen is 50 mug/L, the lower limit of the high-pressure hydrophobic dissolved oxygen is 5 mug/L, and the upper limit of the dissolved oxygen is 300 mug/L.
4. The control method according to claim 2, characterized in that: in order to ensure that the ammonia content of a water vapor system is uniform and easy to control, only a little ammonia is added into a main pipe of an outlet through condensate fine treatment after the unit is oxygenated, and a feed water ammonia adding pump of a down pipe of a deaerator does not need to be put into operation under the working condition of oxygenation treatment.
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| CN202011234709.XA CN112323073B (en) | 2020-11-07 | 2020-11-07 | Corrosion-resistant and scale-proof integrated control system and control method for thermal equipment of power plant |
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| CN202011234709.XA CN112323073B (en) | 2020-11-07 | 2020-11-07 | Corrosion-resistant and scale-proof integrated control system and control method for thermal equipment of power plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113149266A (en) * | 2021-03-19 | 2021-07-23 | 西安热工研究院有限公司 | Intelligent chemical dosing system and dosing method |
| CN113651435A (en) * | 2021-09-18 | 2021-11-16 | 西安热工研究院有限公司 | Self-response unpowered breathable film oxygen increasing, water supplying and oxygen adding device and method |
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| JPH05306803A (en) * | 1992-04-30 | 1993-11-19 | Nikkiso Co Ltd | Method and device for controlling amount of oxygen gas to be injected in treating boiler water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113149266A (en) * | 2021-03-19 | 2021-07-23 | 西安热工研究院有限公司 | Intelligent chemical dosing system and dosing method |
| CN113149266B (en) * | 2021-03-19 | 2023-10-10 | 西安热工研究院有限公司 | Intelligent chemical dosing system and dosing method |
| CN113651435A (en) * | 2021-09-18 | 2021-11-16 | 西安热工研究院有限公司 | Self-response unpowered breathable film oxygen increasing, water supplying and oxygen adding device and method |
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