CN111087100A - Corrosion and scale inhibition control method for circulating cooling water system and corrosion and scale inhibitor - Google Patents
Corrosion and scale inhibition control method for circulating cooling water system and corrosion and scale inhibitor Download PDFInfo
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/14—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
- C02F5/145—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus combined with inorganic substances
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/105—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances combined with inorganic substances
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
- C02F5/125—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen combined with inorganic substances
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
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Abstract
The invention discloses a corrosion and scale inhibition control method of a circulating cooling water system and a corrosion and scale inhibitor, wherein the method comprises the following steps: adding a pH value stabilizer, and adopting an automatic pH value adjusting device to carry out adding and monitoring, wherein the pH value of the system is controlled to be 7.8-9.0; and the corrosion and scale inhibitor is added by adopting an automatic dosing system to control the corrosion and scale formation of the system. The corrosion and scale inhibitor comprises: 10 to 15 percent of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 5 to 20 percent of fluorescent polymer, 0.5 to 5 percent of sodium molybdate, 0.5 to 1 percent of benzotriazole and the balance of water. The technology can better stabilize the pH value of circulating cooling water, and the organic active matter component in the corrosion and scale inhibitor is cooperated with molybdate to form a low-molybdenum efficient low-salt water corrosion and scale inhibitor formula.
Description
Technical Field
The invention belongs to the technical field of industrial circulating water quality management, and relates to a method for controlling scaling corrosion of a circulating cooling water system by using low-salt water as make-up water and a corrosion and scale inhibitor.
Background
The circulating cooling water system provides refrigeration or cooling service for the production process system through circulating evaporation of water, the circulating water is evaporated through the water of the cooling tower, dissolved salts are continuously concentrated, proper pollution discharge is needed for maintaining the stable operation of the system when the circulating cooling water operates to a certain degree, and fresh water is supplemented, otherwise, the problems of scaling, corrosion and the like can occur, and loss is caused for enterprise production.
Under the environment that water resources are increasingly scarce, water-using enterprises take various water-saving measures, wherein softened water, sea fresh water, desalted water and steam condensate are used as circulating water for supplementing water, and fresh water is completely or partially replaced by low-salt water, so that the salt content of a circulating water system can be reduced, the concentration multiple is greatly increased, the discharge capacity of the circulating water is reduced, even in some seasons such as winter, spring and autumn, the discharge can be avoided, the reuse rate of water is improved, and the purpose of saving water is achieved.
Softened water, desalted water and seawater desalination water are taken as one of approaches for comprehensive utilization of water resources, and are applied to circulating water cooling water systems in various industries, after the water quality is applied to circulating water, the circulating water has the characteristics of low alkali, low hardness, high chloride ion and the like, and the stability index (R.S.I) can reach more than 10, so that the water is extremely corrosive. The reason why the water quality is strong in corrosivity is as follows: low alkalinity, small buffering capacity and easy dissolution of CO2The rust layer has strong corrosion acceleration effect on the corrosion process of metals, particularly carbon steel materials once corrosion is generated; the common phosphonate-zinc salt corrosion inhibitor formula belongs to a deposited film type corrosion inhibitor, zinc salt, calcium ions and phosphonate react in a cathode region of a metal surface in water to deposit a film, the content of the calcium ions in low-salt water is less, the formed deposited film is uneven or extremely difficult to form, and the corrosion effect is difficult to control.
At present, the commonly used treatment mode is that the scaling corrosion problem of a circulating water system is generally controlled by adopting a composite formula of regulating substances and phosphorus, the alkalinity and the pH value of water quality are regulated by adding alkali, the calcium ion content of water is regulated by adding calcium chloride, or fresh water and low-salt water are regulated according to a certain proportion, and the treatment mode is very important to the regulation and control of the water quality, the operation is complicated, and the impact resistance of the system is poor.
Patent number ZL 200510132300.6 discloses a molybdenum-phosphorus composite corrosion and scale inhibitor and a preparation method thereof, wherein the content of molybdate is 1-20 wt%, the use cost is too high, and the used organic phosphine raw materials HEDP, ATMP and the like are easy to hydrolyze under high concentration rate, so that the sterilization control difficulty is increased. CN 109110935A discloses a corrosion and scale inhibitor for low hardness and low alkalinity and a preparation method thereof, the formula is a high-phosphorus formula, a low-salt water system generally has higher concentration ratio, the phosphorus content in the system is enriched, and in addition, certain calcium ions in water are required to participate in a film forming reaction.
The utility model discloses a circulating water automatic control system (No. CN 207862064U) applied in 2018, No. 01, No. 18, which comprises a circulating water subsystem, an antisludging agent automatic feeding subsystem, a bactericide feeding subsystem, a pH value adjusting subsystem, a sewage discharging subsystem, a water supplementing subsystem, an electrical cabinet, a PLC (programmable logic controller) and an industrial personal computer, wherein the circulating water subsystem comprises a water collecting tank, a circulating pump, a heat exchanger and a cooling tower which are sequentially communicated through a circulating water pipeline, and the cooling tower is arranged above the water collecting tank; the scale inhibitor automatic adding subsystem, the bactericide adding subsystem, the pH value adjusting subsystem, the sewage discharging subsystem and the water replenishing subsystem are arranged in parallel, and the tail ends of the scale inhibitor automatic adding subsystem, the bactericide adding subsystem, the pH value adjusting subsystem, the sewage discharging subsystem and the water replenishing subsystem are respectively communicated into the water collecting tank; the input end of the electrical cabinet is connected with a monitoring subsystem which is arranged in the circulating water subsystem and used for monitoring the quality of circulating water in real time, the PLC is respectively connected with the electrical cabinet and the industrial personal computer, and the output end of the PLC is respectively connected with the controlled end of each subsystem. This application can realize the quality of water real-time supervision of circulating water system well circulating water to can in time discover the change condition of quality of water index according to the monitoring result, further handle the circulating water according to each device of change state control of quality of water, realized the purpose of real-time change circulating water quality of water, reduced the scale deposit of circulating water, the degree of corrosion, ensured the good quality of circulating water, thereby improved circulating water system's heat exchange rate, reduced the blow off water volume, practiced thrift water resource and manufacturing cost.
Disclosure of Invention
The invention aims to provide a method for controlling corrosion and scaling for a circulating cooling water system using low-salt water as make-up water. The method comprises the following steps: the use of a pH stabilizer and the selection of a corrosion and scale inhibitor, wherein the corrosion and scale inhibitor uses an organic active substance component to cooperate with molybdate and is compounded with phosphonate and a copper corrosion inhibitor to form a low-molybdenum efficient low-salt water corrosion and scale inhibitor formula, a polymer containing a fluorescent monomer is used in the formula, and an online fluorescence detector can be used for realizing automatic dosing and ensuring the stable operation of a system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a corrosion and scale inhibition control method of a circulating cooling water system is disclosed, wherein the corrosion and scale inhibitor is suitable for the circulating cooling water system taking low-salt water as make-up water; the corrosion and scale inhibitor can adopt an online fluorescence sensor to control automatic dosing in a circulating cooling water system taking low-salt water as make-up water, and comprises the following components:
adding a pH value stabilizer, wherein the pH value regulator is added and monitored by adopting an automatic pH value regulator to control the pH value of the system to be 7.8-9.0;
adding a corrosion and scale inhibitor, wherein the corrosion and scale inhibitor adopts an automatic dosing system to control corrosion and scaling of the system;
the corrosion and scale inhibitor comprises the following raw materials in percentage by weight: 10 to 15 percent of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 5 to 20 percent of fluorescent polymer, 0.5 to 5 percent of sodium molybdate, 0.5 to 1 percent of benzotriazole and the balance of water.
Further, the pH value stabilizer is sodium bicarbonate or sodium carbonate; the adding amount of the pH value stabilizer is 100-250 g added to each ton of water; the pH value control range is 7.8-8.3.
Further, the pH automatic control adjusting system comprises a pH probe, a pH controller, a Y-shaped filter, a pH stabilizer storage device, a metering pump and a communication control system, wherein the pH probe is positioned on a testing pipeline, measures the pH value of circulating water on line and sends a signal to the pH controller; and when the pH value is smaller than a set value, the pH controller automatically starts the metering pump to add the pH value stabilizer to the system, and when the pH value reaches a control range, the metering pump stops running to automatically control the pH value.
Furthermore, the Y-shaped filter is arranged in front of the pH sampling probe and is used for filtering suspended matters and microorganism slime in circulating water, so that the measurement accuracy of the pH probe is ensured; the Y-filter must be cleaned periodically.
Furthermore, the automatic dosing system comprises an online fluorescent polymer sensor, an intelligent controller, a corrosion and scale inhibitor storage device, a metering pump and a communication control system.
Further, the concentration of the fluorescent polymer medicament in the water is detected once every 3 seconds by the online fluorescent polymer sensor, and the reasonable concentration of the corrosion and scale inhibitor in the system is kept by the intelligent controller; the intelligent controller will turn the dosing pump down when the fluorescent polymer agent concentration value is above the set point and turn the dosing pump up if the fluorescent polymer agent concentration value is below the set point.
Furthermore, the online fluorescent polymer sensor has the measuring range of 0-200ppb, the precision of 2 percent and the signal output of 4-20mA and Modbus RTU signals.
The corrosion and scale inhibitor is characterized by comprising the following raw materials in percentage by weight: 10 to 15 percent of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 5 to 20 percent of fluorescent polymer, 0.5 to 5 percent of sodium molybdate, 0.5 to 1 percent of benzotriazole and the balance of water.
Further, the corrosion and scale inhibitor comprises the following raw materials in percentage by weight: 12.5-15% of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 10-20% of fluorescent polymer, 1-2% of sodium molybdate, 0.5-1% of benzotriazole and the balance of water.
Further, the fluorescent polymer is an AA/AMPS-containing polymer, and the excitation wavelength is 280-380 nm.
Compared with the prior art, the invention has at least the following beneficial effects.
The pH value of the water system can be effectively controlled by adding the pH value stabilizer, the serious corrosion of the low-salt circulating water system to the water system due to the over-low pH value is prevented, and the corrosivity of the water system is reduced, so that the pressure for adjusting the water quality is greatly reduced.
The corrosion and scale inhibitor of the invention takes organic active substances and molybdate as main components, and the product has the characteristics of excellent corrosion and scale inhibition performance and environmental protection.
The fluorescent polymer adopted by the invention synthesizes the fluorescent monomer on the polymer, does not need physical blending of the traditional inert fluorescent agent, increases the water treatment effect, has no accumulation of toxic substances, and can quickly adjust the dosage through an online fluorescence detector.
Drawings
Fig. 1 is a schematic structural diagram of an automatic circulating water control system application of my company.
Fig. 2 is a schematic diagram of automatic feedback control of the concentration of the agent by fluorescent tracing.
Fig. 3 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be 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 of the embodiments.
In order to further illustrate the invention, the following embodiments are combined to provide a corrosion and scale inhibition control method for a circulating cooling water system, wherein the corrosion and scale inhibitor is suitable for a circulating cooling water system using low salt water as make-up water; the corrosion and scale inhibitor can adopt an online fluorescence sensor to control automatic dosing in a circulating cooling water system taking low-salt water as make-up water. The method comprises the following steps: adding a pH value stabilizer, wherein the pH value regulator is added and monitored by adopting an automatic pH value regulator to control the pH value of the system to be 7.8-9.0; adding a corrosion and scale inhibitor, wherein the corrosion and scale inhibitor adopts an automatic dosing system to control corrosion and scaling of the system; the corrosion and scale inhibitor comprises the following raw materials in percentage by weight: 10 to 15 percent of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 5 to 20 percent of fluorescent polymer, 0.5 to 5 percent of sodium molybdate, 0.5 to 1 percent of benzotriazole and the balance of water.
The pH value stabilizer is sodium bicarbonate or sodium carbonate; the adding amount of the pH value stabilizer is 100-250 g added to each ton of water; the pH value control range is 7.8-8.3.
The pH automatic control adjusting system comprises a pH probe, a pH controller, a Y-shaped filter, a pH stabilizer storage device, a metering pump and a communication control system, wherein the pH probe is positioned on a testing pipeline, measures the pH value of circulating water on line and sends a signal to the pH controller; and when the pH value is smaller than a set value, the pH controller automatically starts the metering pump to add the pH value stabilizer to the system, and when the pH value reaches a control range, the metering pump stops running to automatically control the pH value. The Y-shaped filter is arranged in front of the pH sampling probe and is used for filtering suspended matters and microorganism slime in circulating water to ensure the measurement accuracy of the pH probe; the Y-filter must be cleaned periodically.
The low-salt water is softened water, desalted water and steam condensate.
The automatic dosing system comprises an online fluorescent polymer sensor, an intelligent controller, a corrosion and scale inhibitor storage device, a metering pump and a communication control system. The concentration of the fluorescent polymer medicament in the water is detected once every 3 seconds by the online fluorescent polymer sensor, and the reasonable concentration of the corrosion and scale inhibitor in the system is kept by the intelligent controller; the intelligent controller will turn the dosing pump down when the fluorescent polymer agent concentration value is above the set point and turn the dosing pump up if the fluorescent polymer agent concentration value is below the set point. The online fluorescent polymer sensor has the measuring range of 0-200ppb, the precision of 2 percent and the signal output of 4-20mA and Modbus RTU signals.
The corrosion and scale inhibitor is characterized by comprising the following raw materials in percentage by weight: 10 to 15 percent of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 5 to 20 percent of fluorescent polymer, 0.5 to 5 percent of sodium molybdate, 0.5 to 1 percent of benzotriazole and the balance of water.
Further, the corrosion and scale inhibitor comprises the following raw materials in percentage by weight: 12.5-15% of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 10-20% of fluorescent polymer, 1-2% of sodium molybdate, 0.5-1% of benzotriazole and the balance of water.
The fluorescent polymer is an AA/AMPS-containing polymer, and the excitation wavelength is 280-380 nm.
The automatic control system for the circulating water, which is applied by the company, provides a technology which can process the circulating water according to the real-time state of the circulating water so as to change the water quality of the circulating water in real time, reduce the scaling and corrosion degree, improve the heat exchange rate of a circulating water system and reduce the sewage discharge amount.
In the application, as shown in the figure, the automatic feedback control schematic diagram of the concentration of the medicament is realized by fluorescent tracing, a fluorescent polymer is added into the corrosion and scale inhibitor by using a fluorescent tracing technology, and a fluorescent monomer is synthesized onto the polymer without physical blending of the traditional inert fluorescent agent, so that the water treatment effect is increased, no toxic substance is accumulated, and the dosage can be quickly adjusted by an online fluorescent detector. The addition amount of the corrosion and scale inhibitor is further controlled by detecting the fluorescent polymer.
The cooling circulating water on-line monitoring control device adopts an intelligent on-line fluorescence sensor, detects the concentration of a fluorescent medicament in water once every 3 seconds by measuring a fluorescence technology, and keeps the concentration of a target scale and corrosion inhibitor in the system by an intelligent controller. If the agent concentration value is above the set point, the controller will stop dosing, and if the agent concentration value is below the set point, the controller will turn on the dosing pump. The feedback closed-loop control is realized, and the system medicament concentration can be always in a small range near the control target no matter the heat load changes or the change of the concentration multiple. The difficult problem of detection and control of the concentration of the medicament under the phosphorus-free formula scheme is thoroughly solved. Even the dosing scheme of the phosphorus-containing formula can adopt the technical route of fluorescence detection, and stably and reliably realize automatic dosing.
Automatic pH stabilizer addition monitoring
The pH value regulator is preferably added and monitored by adopting a pH value automatic regulating device. The main equipment of the pH automatic control adjusting system consists of a pH probe, a pH controller, a Y-shaped filter, a pH stabilizer storage device, a metering pump and a communication control system. The pH probe on the test pipeline measures the pH value of the circulating water on line and sends a signal to the pH controller, when the pH value is smaller than a set value, the pH controller automatically starts the metering pump to add the pH value stabilizer to the system, and when the pH value reaches a control range, the metering pump stops running to achieve the purpose of automatically controlling the pH value. Y type filter installs before the pH sampling probe for suspended solid and the microorganism clay in the filtration circulating water ensure the measurement accuracy nature of pH probe, and Y type filter must regularly wash, in order to ensure the unobstructed of sample line, guarantee the representativeness of measured value.
The pH value is set within a range of 7.8 to 8.3.
Automatic feeding monitoring of corrosion and scale inhibitor
The corrosion and scale inhibitor is preferably an automatic dosing system, and the main equipment of the automatic dosing system consists of an online fluorescent polymer sensor, an intelligent controller, a corrosion and scale inhibitor storage device, a metering pump and a communication control system. The concentration of the fluorescent polymer medicament in the water is detected once every 3 seconds by measuring a fluorescence technology, and the reasonable concentration of the corrosion and scale inhibitor in the system is kept by an intelligent controller. The controller will turn the dosing pump off if the medicament concentration value is above the set point and turn the dosing pump on if the medicament concentration value is below the set point. This enables a feedback closed loop control such that the system agent concentration is always within a small range around the control target.
The on-line fluorescent polymer sensor has the measuring range of 0-200ppb, the precision of 2 percent, the signal output of 4-20mA and ModbusRTU signals, and the excitation wavelength of the fluorescent polymer is 280-380 nm.
Example 1
In this embodiment, the concentration of the added pH stabilizer is 150 g/ton of water, the pH value of the system is controlled to be 8.0, and the corrosion and scale inhibitor comprises the following raw materials in percentage by weight: 15% of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 10% of fluorescent polymer, 3% of sodium molybdate, 1% of benzotriazole and the balance of water.
The water quality of the water supplement in the embodiment
| Item | Index (I) |
| Ca2+(with CaCO)3Meter, mg/l) | 17.28 |
| Total hardness (as CaCO)3Meter, mg/l) | 33.70 |
| Total alkalinity (as CaCO)3Meter, mg/l) | 57.50 |
| Cl-(mg/l) | 17.11 |
| pH value | 6.82 |
| Conductivity (us/cm) | 101 |
Corrosion rate determination is carried out according to the rotating hanging piece method GB/T18175-2014 for determining corrosion inhibition performance of water treatment agent
| Test number | Test piece material | Corrosion rate, mm/a |
| 1 | A3 carbon steel | 0.0182 |
| 2 | No. 20 carbon steel | 0.026 |
| 3 | 304 stainless steel | 0.0005 |
| 4 | 316 stainless steel | 0.0001 |
| 5 | Brass | 0.001 |
Referring to a method for measuring the scale inhibition performance of a GB/T16632-
Example 2
The embodiment relates to the application effect evaluation of the method in an industrial circulating cooling water system.
The circulating water quantity of a power circulating water system of a certain glycine production enterprise is 6000m3Per hour, water retention capacity 3000m3The temperature difference is 6 ℃, the recovered steam condensate is all used for supplementing water of a circulating cooling water system, and the quality of the steam condensate is
| Item | Index (I) |
| Ca2+(with CaCO)3Meter, mg/l) | 7.32 |
| Total hardness (as CaCO)3Meter, mg/l) | 9.50 |
| Total alkalinity (as CaCO)3Meter, mg/l) | 68.36 |
| Cl-(mg/l) | 3.21 |
| pH value | 7.12 |
| Conductivity (us/cm) | 81 |
In the embodiment, the concentration of the added pH stabilizer is 200 g/ton of water, the pH value of the system is controlled to be 7.8-8.0, and the pH stabilizer adopts an automatic medicine adding device; the corrosion and scale inhibitor comprises the following raw materials in percentage by weight: 12.5% of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 10% of fluorescent polymer, 1% of sodium molybdate, 1% of benzotriazole and the balance of water. The corrosion and scale inhibitor adopts an automatic dosing system provided with an online fluorescence detection device. After running for 60 days, the corrosion rate of the hanging pieces made of different materials
Scale inhibition rate measurement data, as shown in fig. 3.
Example 3
The embodiment relates to the application effect evaluation of the method in an industrial circulating cooling water system.
Circulating water amount 3200m for certain LNG production enterprise3Per hour, water retention 1000m3The temperature difference is 6 ℃, shallow demineralized water is used as make-up water, and the quality of the shallow demineralized water
In the embodiment, the concentration of the added pH stabilizer is 250 g/ton of water, the pH value of the system is controlled to be 7.8-8.0, and the pH stabilizer adopts an automatic medicine adding device; the corrosion and scale inhibitor comprises the following raw materials in percentage by weight: 15% of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 10% of fluorescent polymer, 1.5% of sodium molybdate, 1% of benzotriazole and the balance of water. The corrosion and scale inhibitor adopts an automatic dosing system provided with an online fluorescence detection device. After running for 60 days, the corrosion rate of the hanging pieces made of different materials
The scale inhibition rate is detected to be 97.6%.
The corrosion rate of carbon steel equipment is less than 0.075mm/a, the corrosion rate of stainless steel equipment is less than 0.005mm/a, and the corrosion rate of copper and copper alloy equipment is less than 0.005mm/a, which are specified in the national standard GB 50050-2017 Industrial recirculated Cooling Water treatment design Specification.
From the data of the above example it can be seen that: in example 1, the corrosion rates of A3 and 20# carbon steel are 0.018 and 0.026mm/a, and both are less than 0.075 mm/a; 304. the corrosion rate of 316 stainless steel is 0.0005, 0.0001mm/a, and both are less than 0.005 mm/a; the corrosion rate of the copper hanging sheet is 0.001 and less than 0.005mm/a, and all data of the corrosion rate meet the national standard requirements. The scale inhibition rate is more than 96%.
In example 2, the corrosion rates of the carbon steel twice are 0.042 mm/, 0.044 mm/; the corrosion rate of the stainless steel twice is 0.000 and 0.0005 mm/a; the corrosion rate of copper twice is 0.001mm/a, and all data of the corrosion rate meet the national standard requirement. The scale inhibition rate is more than 94%.
In example 3, the corrosion rates of carbon steel twice were 0.055 and 0.048 mm/; the corrosion rate of the stainless steel twice is 0.0002 and 0.0005 mm/a; the corrosion rate of copper twice is 0.002mm/a, and all data of the corrosion rate meet the national standard requirements. The scale inhibition rate is more than 97%.
From the above example data it can be seen that: the method can control the corrosion rate of the circulating cooling water to reach the national standard, and the scale inhibition rate is controlled to be more than 94%.
The pH value of the water system can be effectively controlled by adding the pH value stabilizer, the serious corrosion of the low-salt circulating water system to the water system due to the over-low pH value is prevented, and the corrosivity of the water system is reduced, so that the pressure for adjusting the water quality is greatly reduced.
The corrosion and scale inhibitor of the invention takes organic active substances and molybdate as main components, and the product has the characteristics of excellent corrosion and scale inhibition performance and environmental protection.
The fluorescent polymer adopted by the invention synthesizes the fluorescent monomer on the polymer, does not need physical blending of the traditional inert fluorescent agent, increases the water treatment effect, has no accumulation of toxic substances, and can quickly adjust the dosage through an online fluorescence detector.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and it should be understood that modifications and equivalents may be made thereto by those skilled in the art without departing from the scope of the present invention.
Claims (10)
1. A corrosion and scale inhibition control method of a circulating cooling water system is characterized by comprising the following steps: the corrosion and scale inhibitor is suitable for a circulating cooling water system taking low-salt water as make-up water; the corrosion and scale inhibitor can adopt an online fluorescence sensor to control automatic dosing in a circulating cooling water system taking low-salt water as make-up water, and comprises the following components:
adding a pH value stabilizer, wherein the pH value regulator is added and monitored by adopting an automatic pH value regulator to control the pH value of the system to be 7.8-9.0;
adding a corrosion and scale inhibitor, wherein the corrosion and scale inhibitor adopts an automatic dosing system to control corrosion and scaling of the system;
the corrosion and scale inhibitor comprises the following raw materials in percentage by weight: 10 to 15 percent of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 5 to 20 percent of fluorescent polymer, 0.5 to 5 percent of sodium molybdate, 0.5 to 1 percent of benzotriazole and the balance of water.
2. The corrosion and scale inhibition control method of a circulating cooling water system according to claim 1, characterized in that: the pH value stabilizer is sodium bicarbonate or sodium carbonate; the adding amount of the pH value stabilizer is 100-250 g added to each ton of water; the pH value control range is 7.8-8.3.
3. The corrosion and scale inhibition control method of a circulating cooling water system according to claim 1, characterized in that: the pH automatic control adjusting system comprises a pH probe, a pH controller, a Y-shaped filter, a pH stabilizer storage device, a metering pump and a communication control system, wherein the pH probe is positioned on a testing pipeline, measures the pH value of circulating water on line and sends a signal to the pH controller; and when the pH value is smaller than a set value, the pH controller automatically starts the metering pump to add the pH value stabilizer to the system, and when the pH value reaches a control range, the metering pump stops running to automatically control the pH value.
4. The corrosion and scale inhibition control method of a circulating cooling water system according to claim 3, characterized in that: the Y-shaped filter is arranged in front of the pH sampling probe and is used for filtering suspended matters and microorganism slime in circulating water to ensure the measurement accuracy of the pH probe; the Y-filter must be cleaned periodically.
5. The corrosion and scale inhibition control method for a circulating cooling water system according to claim 1 or 2, characterized in that: the automatic dosing system comprises an online fluorescent polymer sensor, an intelligent controller, a corrosion and scale inhibitor storage device, a metering pump and a communication control system.
6. The corrosion and scale inhibition control method of a circulating cooling water system according to claim 5, characterized in that: the concentration of the fluorescent polymer medicament in the water is detected once every 3 seconds by the online fluorescent polymer sensor, and the reasonable concentration of the corrosion and scale inhibitor in the system is kept by the intelligent controller; the intelligent controller will turn the dosing pump down when the fluorescent polymer agent concentration value is above the set point and turn the dosing pump up if the fluorescent polymer agent concentration value is below the set point.
7. The corrosion and scale inhibition control method of the circulating cooling water system according to claim 6, wherein the online fluorescent polymer sensor has a measuring range of 0-200ppb, an accuracy of 2% and signal outputs of 4-20mA and Modbus RTU signals.
8. The corrosion and scale inhibitor is characterized by comprising the following raw materials in percentage by weight: 10 to 15 percent of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 5 to 20 percent of fluorescent polymer, 0.5 to 5 percent of sodium molybdate, 0.5 to 1 percent of benzotriazole and the balance of water.
9. The corrosion and scale inhibitor according to claim 8, wherein the corrosion and scale inhibitor comprises the following raw materials in percentage by weight: 12.5-15% of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 10-20% of fluorescent polymer, 1-2% of sodium molybdate, 0.5-1% of benzotriazole and the balance of water.
10. The corrosion and scale inhibitor according to claim 8 or 9, wherein the fluorescent polymer is an AA/AMPS-containing polymer, and the excitation wavelength is 280-380 nm.
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