CN116332370B - Circulating cooling water operation control method - Google Patents
Circulating cooling water operation control method Download PDFInfo
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- CN116332370B CN116332370B CN202310387942.9A CN202310387942A CN116332370B CN 116332370 B CN116332370 B CN 116332370B CN 202310387942 A CN202310387942 A CN 202310387942A CN 116332370 B CN116332370 B CN 116332370B
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/348—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the way or the form in which the microorganisms are added or dosed
-
- 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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention provides a circulating cooling water operation control method, which is applied to a circulating cooling water system and comprises the following steps: s1, performing biochemical treatment on circulating cooling water; s2, calculating a concentration multiple N; and S3, performing operation control according to the concentration multiple, pH and predicted value of the instantaneous corrosion rate of the circulating cooling water. The circulating cooling water operation control method adopts a mode of adding microbial agents to regulate and control the pH value of a circulating cooling water system, prevents the scaling of the circulating cooling water system and realizes the high concentration ratio operation of the circulating cooling water; the corrosion risk of the circulating cooling water system is reduced by pre-regulating and controlling the metal corrosion rate trend prediction; the pH, conductivity and metal corrosion rate can be monitored on line, the hardware investment is low, and the transformation cost is low.
Description
Technical Field
The invention relates to the technical field of circulating water management, in particular to a circulating cooling water operation control method.
Background
Industrial water generally comprises process water, boiler water, washing water, cooling water and the like, wherein the cooling water can reach 80% -90% of the total industrial water, has the advantages of large circulating water quantity, high heat capacity, simple cooling means and the like, and has been widely used in industries such as petroleum, coal, chemical industry, power generation, municipal administration and the like.
The circulating cooling water system takes water as a cooling medium and consists of heat exchange equipment, cooling equipment, a water pump, a pipeline and other related equipment, and the running stability of the circulating cooling water system has important significance for ensuring continuous production of enterprises. Because inorganic ions in the circulating cooling water are concentrated continuously due to continuous evaporation of water in the operation process, scaling and corrosion are easy to cause, and long-term stable operation of a circulating cooling water system is seriously influenced.
Therefore, the circulating cooling water system needs to be timely supplemented with water and drained to control the concentration of relevant ions at a safe level, and the concentration multiple is usually 5, so that high concentration rate operation cannot be realized; for this reason, the prior art with publication number CN102681452a discloses and a method for controlling a circulating water system, which comprises the following steps: ⑴ And obtaining the ultimate concentration ratio in the circulating water through a scale inhibition test. ⑵ And determining the limiting value, the hardness limiting value and the alkalinity limiting value of the chloride ion concentration ratio of the circulating water at the limiting concentration ratio. ⑶ And (3) setting a chloride ion concentration multiple for controlling safe circulating water operation, and determining control indexes of alkalinity and hardness. ⑷ And detecting the alkalinity and hardness of the circulating water. ⑸ Observing whether the alkalinity detection value and the hardness detection value of the circulating water accord with the control index, and if one or both of the alkalinity detection value and the hardness detection value do not accord with the control index, treating and adjusting the circulating water and then detecting. ⑹ And if the detected value of the alkalinity and the hardness of the detected value meet the control index, ending the detection. The concentration multiplying power is lower in the prior art, so that the water consumption and the pollution discharge are large, the efficiency of the water treatment agent cannot be fully exerted, the chloride ion is adopted to calculate the concentration 25 multiplying power of the circulating water, the detection of the chloride ion is needed manually, the detection test needs the chemical agent, the personal safety of operators is endangered, and the test waste liquid needs to be treated, so that the financial resources, the material resources and the manpower are wasted, and the economic cost is high.
In view of this, the present invention has been made.
Disclosure of Invention
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
A circulating cooling water operation control method is applied to a circulating cooling water system, and comprises the following steps: s1, performing biochemical treatment on circulating cooling water; s2, calculating a concentration multiple N; and S3, performing operation control according to the concentration multiple, pH and predicted value of the instantaneous corrosion rate of the circulating cooling water.
The device can greatly improve the concentration ratio of the circulating cooling water system, reduce the water supplementing amount and the sewage discharging amount, avoid secondary pollution, simplify the supervision of chemical technology, reduce the labor intensity of staff and have obvious economic, safe, social and ecological benefits; the corrosion problem of the circulating cooling water to the metal can be further controlled by performing early response and adjustment through the predicted value of the instantaneous corrosion rate; the control method has the advantages of simple operation, convenient control and strong adaptability, can improve the concentration ratio of the circulating water, save water resources, reduce the pollution of the circulating water pollution discharge to the environment, and has good economic and social benefits due to the added raw materials.
Preferably, step S3 includes: s31, judging whether the concentration multiple N is more than 5 at the moment of t k, if yes, performing step S32, and if not, performing regulation and control according to the pH value of the circulating cooling water; s32, controlling according to the pH value of the circulating cooling water and the predicted value X k+1' of the instantaneous corrosion rate.
The setting responds through the conditions, and when the concentration multiple is low, the pH is regulated and controlled; when the concentration multiple is higher, the pH is combined with the predicted value of the instantaneous corrosion rate to respond, so that the accuracy and the reliability of operation control are improved.
Preferably, step S32 includes:
S321, judging whether the pH value of the circulating cooling water is less than 8.2, if so, entering a step S34; if not, supplementing 0.006% of microbial agent;
S322, judging whether the pH value of the circulating cooling water is less than 7.5, if so, starting a water supplementing pump and supplementing water by 5-10%; if not, go to step S35;
s323, judging whether the pH value of the circulating cooling water is less than 7.7, if yes, entering step S324; if not, controlling the circulating water system to continue to run according to preset conditions;
S324, calculating and judging whether a predicted value X k+1' of the instantaneous corrosion rate at the moment t k+1 is less than A according to GM (1, 1), if yes, controlling the circulating water system to continue to operate according to preset conditions; if not, the water supplementing pump and the sewage pump are started.
On the one hand, the pH is reduced to be slightly acidic due to the metabolic activity of microorganisms, and acid corrosion effect on metals can exist; in addition, after the concentration ratio is increased, the ion content in water is increased, and the corrosion to metal can be enhanced. The instantaneous corrosion rate of the metal is monitored by adopting a corrosion rate meter, and a predicted value of the instantaneous corrosion rate is obtained according to GM (1, 1), so that the biochemical treatment operation process is timely adjusted.
Preferably, step S324 includes:
S3241, calculating and judging whether the instantaneous corrosion rate V i is smaller than A, if yes, controlling the circulating water system to continue to operate according to preset conditions; if not, go to step S3242;
S3242, calculating and judging whether a predicted value X k+1' of the instantaneous corrosion rate at the moment t k+1 is less than A according to GM (1, 1), if yes, controlling the circulating water system to continue to operate according to preset conditions; if not, the water supplementing pump and the sewage pump are started.
The time interval for determining the instantaneous corrosion rate X may be 1h, 3h, 6h, 24h, etc. Preferably, t k+1-tk =6h this arrangement ensures accurate and reliable data of the predicted instantaneous corrosion rate X while allowing sufficient time for adjustment to achieve stable and reliable operation at high concentration multiples.
Preferably, the predicted value xk+1' of the instantaneous corrosion rate is calculated using the following formula:
wherein: x-instantaneous corrosion rate of metal in millimeters per year (mm/a);
k-time series, unit year (a);
a-the coefficient of development;
u-grey coefficient of action.
Preferably, step S1 includes: s11, adding 0.03-0.05% of sterilizing algicides such as sodium hypochlorite into the circulating cooling water to kill microorganisms in the circulating cooling water; s12, after the residual chlorine content is reduced to 0.1 mg.L -1, adding the microbial agent and the nutritional agent according to a certain proportion through a dosing pipeline 11. The device can kill the primary microorganisms, reduce the influence on the growth and reproduction of microbial agents, and has strong controllability.
Preferably, the concentration multiple N in step S2 is calculated using the following formula;
Wherein: kappa i-real-time conductivity value of circulating cooling water, mu s/cm; kappa 0-conductivity value of the circulating water, mu s/cm.
The first conductivity meter and the second conductivity meter are additionally arranged on the first circulating water pipeline and the second circulating water pipeline, and the circulating cooling water supplementing and circulating water concentrating multiplying power is controlled through the corresponding relation between the first conductivity meter, the second conductivity meter and the salt content, so that the water quality adjustment of the circulating water is faster and more convenient.
Preferably, the circulating cooling water system comprises a cooling tower, a circulating water tank, a first circulating water pipeline, a second circulating water pipeline, a sewage drain pipeline, a water supplementing pipeline and a condenser, wherein the circulating water output end of the circulating water tank is connected with one end of the water side of the condenser through the first circulating water pipeline, the other end of the water side of the condenser is connected with the circulating water input end of the cooling tower through the second circulating water pipeline, a pH sensor, a corrosion rate meter and a second conductivity meter are arranged on the second circulating water pipeline, the pH sensor and the corrosion rate meter are all close to the condenser, and the first conductivity meter and the water supplementing pump are sequentially arranged on the water supplementing pipeline, and the sewage drain pump is arranged on the sewage drain pipeline.
The arrangement ensures that the open cooling water circulation system realizes the feeding of microbial agents and nutrients, and the multiplying power of the circulating cooling water can be improved according to the water quality of the circulating cooling water, so that the treatment targets of scale inhibition, corrosion inhibition, algae breeding, slime prevention and the like of the cooling system are realized; the hardware investment is less, and the transformation cost is low.
Preferably, the circulating cooling water system further comprises a control system, and the control system is electrically connected with the pH sensor, the first conductivity meter, the second conductivity meter, the corrosion rate meter, the water supplementing pump and the sewage pump respectively. The setting can realize the real-time monitoring of the running parameters of the circulating cooling water, and simultaneously, the automatic control is convenient to realize.
Preferably, the concentration ratio pole Nmax of the circulating water is controlled between 12-15 times. The arrangement ensures that the water saving and emission reduction effect of the circulating cooling water system is obvious, and simultaneously effectively controls the scaling and corrosion tendency of the circulating water.
Compared with the prior art, the control method for the operation of the circulating cooling water has the following beneficial effects: 1) The pH value of the circulating cooling water system is regulated and controlled by adding a microbial agent, so that the scaling of the circulating cooling water system is prevented, and the high concentration ratio operation of the circulating cooling water is realized; 2) The corrosion risk of the circulating cooling water system is reduced through predicting the metal corrosion rate trend; 3) The pH, conductivity and metal corrosion rate can be monitored on line, the hardware investment is low, and the transformation cost is low.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a circulating water cooling system according to the present invention;
fig. 2 is a schematic flow chart of the circulating cooling water operation control method according to the present invention.
Reference numerals illustrate:
1-cooling tower, 2-circulating water tank, 3-blow-down pipeline, 31-blow-down pump, 4-water supplementing pipeline, 41-first electric conductivity meter, 42-water supplementing pump, 5-circulating pump, 6-pH sensor, 7-second electric conductivity meter, 8-first circulating water pipeline, 9-condenser, 10-second circulating water pipeline, 11-dosing pipeline, 111-dosing tank and 112-dosing pump; 12-corrosion Rate instrument.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It should be noted that: the technical features of the present invention may be combined with each other without collision.
The raw water is supplemented to a circulating water system after being treated, cooling water is conveyed to a heat exchanger from a tower pool by a circulating pump, the circulating water is sprayed and radiated by a cooling tower after passing through the heat exchanger and then returns to the tower pool for recycling, and therefore a water circulating system is formed. The circulating water can evaporate after being heated, so that evaporation loss is caused, the salt content of the water quality of the circulating water can be increased, and when the salt content of the circulating water is increased to a certain value, the problems of corrosion, scaling and the like of a circulating water system can occur.
In the prior art, the concentration of the inorganic ions is controlled at a safe level by timely supplementing water and draining water to maintain a low concentration multiple; in addition, chemical agents such as corrosion inhibition, scale inhibition, bactericides and the like are required to be frequently added in the running process; the addition of the agent not only increases the running cost of the circulating cooling water system, but also causes secondary pollution and increases the treatment difficulty of drainage outside the system.
In addition, the prior art of publication No. CN115196718A discloses a circulating cooling water treatment method, which can realize the effects of corrosion prevention, scale inhibition and bacteriostasis by selectively removing corrosion, scale formation and nutrition ions in water through commercial resin, can be used for supplementing water production of a circulating cooling water system, can also be used for bypass control of water quality of the circulating cooling water system, and can realize long-term and stable operation of the circulating cooling water system without adding preservatives, corrosion inhibitors and bactericides. The prior art of publication number CN11533221A discloses an industrial circulating water integral treatment system and process, including circulating water cooling tower, heat exchanger, first electrochemical treatment system, second electrochemical treatment system and third electrochemical treatment system, be provided with the circulating pump between heat exchanger and the circulating water cooling tower, can effectively solve corruption, fungus algae and scale deposit problem, improve circulating water concentration multiple, but above-mentioned scheme all has the input cost height and can't realize the accurate control of circulating cooling water treatment when relevant ion concentration is higher. For this, the applicant proposes the following technical solutions:
The circulating cooling water system comprises a cooling tower 1, a circulating water tank 2, a sewage pipeline 3, a sewage pump 31, a water supplementing pipeline 4, a first electric conductivity meter 41, a water supplementing pump 42, a circulating pump 5, a pH sensor 6, a second electric conductivity meter 7, a first circulating water pipeline 8, a condenser 9, a second circulating water pipeline 10, a dosing pipeline 11, a dosing tank 111, a dosing pump 112 and a corrosion rate meter 12;
The circulating water output end of the circulating water tank 2 is connected with one end of the water side of the condenser 9 through the first circulating water pipeline 8, the other end of the water side of the condenser 9 is connected with the circulating water input end of the cooling tower 1 through the second circulating water pipeline 10, and the dosing pipeline 11 is connected with the second circulating water pipeline 10.
Preferably, a 220v fixed power supply is selected near the condenser 9 and connected to the vicinity of a grid plate at the upper side of the drain pump pit, each path of the No. 1 and No. 2 units is provided with 0.5kW of power, and the power is respectively used as the power supply of the second electric conductivity meter 7 and the pH sensor 6.
Specifically, the first circulating water pipe 8 is sequentially provided with a circulating pump 5 and a condenser 9.
The pH sensor 6 is arranged on the circulating cooling water system, the pH value of the circulating cooling water can be monitored by the pH sensor 6, the water quality of the circulating water can be detected on line by the second conductivity meter 7, and the instantaneous corrosion rate of the circulating cooling water to metal can be monitored on line by the corrosion rate meter 12.
As an example of the present invention, the corrosion rate meter 12 measures the linear polarization resistance of the metal electrode using a linear polarization method (LPR). The generated direct current is measured by electrochemically polarizing the system to be measured by applying a small potential disturbance near the open circuit potential of the metal. Since the polarization potential and the current are approximately in a linear relationship at the time of low current density polarization, the ratio of the polarization potential to the current is a linear polarization resistance, which is inversely proportional to the corrosion rate. The linear polarization method is an electrochemical test method with small disturbance, does not have great influence on the metabolic activity of microorganisms, and can realize continuous monitoring of the metal corrosion rate.
The corrosion rate meter sensing probe is made of metal materials with the same model as that of the condenser. The corrosion rate meter obtains a stable potential value by measuring the Open Circuit Potential (OCP) under the current water quality condition. The polarization potential is controlled within the micropolarized region of the open circuit potential by linear DC potential scanning over a narrow range (+ -10 mV) relative to the open circuit potential by linear polarization. The polarization potential and the polarization current of the working electrode are tested at intervals, and the linear polarization Resistance (RP) can be obtained by the slope of the working electrode at the zero point, and the calculation formula is as follows:
Wherein: r P -linear polarization resistance, kΩ/cm 2;
E-polarization potential, mV;
i-polarization current, μA/cm 2;
i corr -corrosion current density, μA/cm 2;
Beta a -anode Tafel slope, mV;
beta c -cathode Tafel slope, mV;
v i -instantaneous corrosion rate, mm/a;
m-molar amount of metal, g/mol;
n-electron transfer number;
F-Faraday constant, 96500C/mol;
ρ -test piece material density, g/cm 3.
When the linear polarization resistance value is larger, the corrosion rate of the metal is smaller, and the corrosion prevention effect of the microbial agent is better.
Specifically, the sewage drain pipe 3 and the water supplementing pipe 4 are respectively connected with the circulating water tank 2, the sewage drain pump 31 is arranged on the sewage drain pipe 3, and the water supplementing pump 42 and the first electric conductivity meter 41 are arranged on the water supplementing pipe 4. In the scheme of the application, the sewage pump 31 and the water supplementing pump 32 can be regulated according to the needs to control the sewage flow and the water supplementing flow, so that the conductivity and the concentration ratio of the circulating cooling water are maintained in a certain range, and the first conductivity meter can detect the water quality of the circulating water on line.
Specifically, the dosing pipeline 11 is provided with a dosing tank 111 and a dosing pump 112, and in the scheme of the application, the water quality parameters of the circulating water can be detected according to the pH sensor 6, the first conductivity meter 41 and the second conductivity meter 7, and the concentration multiple can be calculated to carry out dosing and pollution discharge; the medicine adding pump 112 is used for providing power, and the medicine adding box 111 is used for adding the required medicine to meet the requirement of the water quality standard of the circulating water.
Preferably, the circulating cooling water system further comprises a control system, and the control system is electrically connected with the pH sensor 6, the first conductivity meter 41, the second conductivity meter 7, the corrosion rate meter 12 dosing pump 112, the water supplementing pump 42 and the sewage pump 31 respectively. The arrangement can realize the automatic control of the water treatment system.
The invention also provides a circulating cooling water operation control method, which comprises the following steps:
s1, biochemical treatment of circulating cooling water
Before the circulating cooling water system is started, bactericide is added into the circulating cooling water tower in advance for sterilization, the activated microbial preparation and the nutrient are added into a dosing tank, the activated microbial preparation and the nutrient are added into a dosing pipeline by providing power through a dosing pump, then enter the circulating cooling water system and finally reach the circulating cooling water tower, and a micro-ecological system in the circulating cooling water system is constructed by utilizing the microbial preparation and the nutrient.
Preferably, the method comprises the following steps:
s11, adding 0.03-0.05% of sterilizing algicides such as sodium hypochlorite into the circulating cooling water to kill microorganisms in the circulating cooling water;
S12, after the residual chlorine content is reduced to 0.1 mg.L -1, adding microbial inoculant and nutritional agent in proportion through a dosing pipeline 11 to construct a microecological system.
As an example of the present invention, the microbial agent is composed of the following components in parts by weight: 10-40 parts of nitrifying bacteria dry powder, 20-30 parts of bacillus subtilis dry powder, 20-30 parts of denitrifying bacteria dry powder, 10-20 parts of photosynthetic bacteria dry powder, 5-10 parts of sulfur bacteria dry powder and 5-15 parts of methane bacteria dry powder.
The nutritional agent comprises the following components in parts by weight: 20-30 parts of monocrystal arabinose dry powder, 2-5 parts of vitamin C, 5-10 parts of carbonic acid amide, 30-60 parts of ammonium sulfate, 5-20 parts of ammonium chloride and 1-5 parts of ammonium molybdate.
Preferably, the nitrifying bacteria dry powder, the bacillus subtilis dry powder, the denitrifying bacteria dry powder and the active lysozyme dry powder are produced by all companies of Severe Katsumadai biological engineering Co., ltd, the photosynthetic bacteria dry powder and the sulfur wire bacteria dry powder are produced by Jiangsu green family biotechnology Co., ltd, and the methane bacteria dry powder is produced by Shandong su Ke Han biological engineering Co., ltd.
Preferably, step S12 includes:
S121, after the residual chlorine content is reduced to 0.1 mg.L -1, adding a microbial agent and a nutritional agent in proportion through a dosing pipeline 11; as an example of the present invention, the microbial agent and the nutritional agent are added in a ratio of 0.01% and 0.03%, respectively.
S122, measuring an initial pH value-H0 of circulating cooling water and a pH value-H1 after 48 hours of operation, judging whether H1 is less than H0, if so, executing a step S123; if not, adding 0.005% microbial agent again;
s123, judging whether H1 is more than 8, if so, supplementing 0.015% of nutrient; if not, the process proceeds to step S2.
When the pH value is reduced, the active microorganisms are indicated to adapt to the quality of the circulating cooling water and start metabolism; when H1 is more than 8, the nutrient in the circulating water is increased, and when H1 is less than 8, the microbial activity reaches the treatment requirement of the circulating cooling water.
S2, monitoring in real time according to the first conductivity table 41 and the second conductivity table 7 and calculating a concentration multiple N;
Wherein: kappa i -real-time conductivity value of circulating cooling water, mu s/cm; kappa 0 -conductivity value of the circulating water, mu s/cm.
The concentration ratio of the circulating cooling water is considered to be generally measured manually, namely, the ratio of the salt content (dissolved solids) of the circulating water to the salt content of the supplementing water. However, the method includes 1) the treatment of the test waste liquid and the waste of financial resources, material resources and manpower; 2) The chemical agent is toxic and endangers the personal safety of operators; 3) The reagent silver nitrate for testing chloride ions is expensive, so that the running cost is increased; 4) The online chlorine ion and calcium ion online detection meter has high investment and inaccurate measurement; 5) The time for testing after manual sampling, especially for testing the salt content (dissolved solids) is long, and a person on duty is informed of the calculation, so that the water quality of the circulating water needs to be adjusted for a long time, the water quality of the circulating water cannot be adjusted in time, and the time delay is caused, so that hidden danger is brought to corrosion and scaling of a circulating water system. The concentration ratio method of the invention can overcome the defects.
S3, automatically controlling the operation of the circulating cooling water according to the concentration multiple and the pH value.
The microbial agent can consume the alkalinity in the circulating cooling water to control the pH value to be less than 8.2, so that no carbonate (CO 3 2-) and hydroxide (OH -) ions participating in scaling in the circulating cooling water are ensured to prevent the scaling of the circulating cooling water; according to the concentration multiple, when the pH value is close to the lower limit of control, the instantaneous corrosion rate of the metal electrode is measured by a corrosion rate meter, the metal corrosion rate at the future moment is predicted by adopting a GM (1, 1) model, the water supplementing and the sewage draining amount of the circulating cooling water are adjusted, and the corrosion of the circulating cooling water system can be prevented, so that continuous and stable operation under the high concentration multiple is realized.
The step S3 comprises the following steps:
S31, judging whether the concentration multiple N is more than 5 at the time t k, if so, performing the step S32, and if not, performing the step S33;
S32, judging whether the pH value of the circulating cooling water meets 7.5 < pH value < 8.2, if so, controlling the circulating water system to continue to operate according to preset conditions; if not, adding microbial agent or starting a water supplementing pump to operate;
as an example of the invention, when the pH is less than 7.5, the water supplementing pump 42 is started to supplement water by 2-5%; when the pH is more than 8.2, adding 0.005% of microbial agent; the water supplementing pump 42 can be started to supplement water by 2-5%.
S33, judging whether the pH value of the circulating cooling water is less than 8.2, if so, entering a step S34; if not, supplementing 0.006% of microbial agent;
S34, judging whether the pH value of the circulating cooling water is less than 7.5, if so, starting the water supplementing pump 42 and supplementing 5-10%; if not, go to step S35;
s35, judging whether the pH value of the circulating cooling water is less than 7.7, if so, entering a step S36; if not, controlling the circulating water system to continue to run according to preset conditions;
s36, calculating and judging whether a predicted value X k+1' of the instantaneous corrosion rate at the moment t k+1 is less than A according to GM (1, 1), if yes, controlling the circulating water system to continue to operate according to preset conditions; if not, the water replenishing pump 42 and the sewage pump 31 are turned on.
As an example of the invention, 3-20% of circulating cooling water is updated and changed by starting the water supplementing pump 42 and the sewage discharging pump 31; preferably, 3-5% of circulating cooling water is updated by starting the water supplementing pump 42 and the sewage draining pump 31, and the concentration coefficient n=n×80% is achieved.
The time interval for determining the instantaneous corrosion rate X may be 1h, 3h, 6h, 24h, etc. Preferably, t k+1-tk =6h this arrangement ensures accurate and reliable data of the predicted instantaneous corrosion rate X while allowing sufficient time for adjustment to achieve stable and reliable operation at high concentration multiples.
The predicted value X k+1' of the instantaneous corrosion rate is predicted by adopting a gray theory GM (1, 1) model:
A non-negative monotonic raw data column with variable X (0)＝{X(0) (i), i=1, 2,..n } for the acquired instantaneous corrosion rate of the metal is established, and a time-series grey prediction model is established. First, performing one accumulation on X (0) to generate one accumulation sequence:
X(1)＝{X(1)(k),k＝1,2,...,n}
wherein:
For X (1) (k) the differential equation for the whitened form can be established:
That is, GM (1, 1) model, the solution of the whitening differential equation is:
The predicted values were obtained as:
wherein: x-instantaneous corrosion rate of metal in millimeters per year (mm/a);
k-time series, unit year (a), also month or day or hour;
a-the coefficient of development;
u-grey coefficient of action.
Preferably, the step S36 further includes:
S361, calculating and judging whether a predicted value X k+1' < A of the instantaneous corrosion rate at the moment t n+1 is calculated according to the instantaneous corrosion rate X k at the moment t K through an M (1, 1) model, and if yes, controlling the circulating water system to continue to operate according to preset conditions; if not, go to step S362;
362. And calculating the predicted instantaneous corrosion rate X k 'at the time t k according to the instantaneous corrosion rate X k-1 at the time t K-1, judging whether X k'/XK is smaller than 1 and X k+1'/Xk' is larger than 1, starting the water supplementing pump 42 and the sewage pump 31, and if not, starting the sewage pump 31.
When the predicted value is in an increasing trend and is higher than the actual measured value, the device simultaneously carries out pollution discharge and water supplementing so as to prevent corrosion to metal; in addition, it is indicated that the predicted value may deviate, and only the pollution discharge is regulated in advance, and the circulating cooling water is maintained to be still in high concentration ratio operation as far as possible by repairing through the microbial metabolism activity.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (6)
1. The circulating cooling water operation control method is applied to a circulating cooling water system and is characterized by comprising the following steps of:
S1, biochemical treatment of circulating cooling water, which comprises the following steps:
s11, adding 0.03-0.05% sodium hypochlorite into the circulating cooling water to kill microorganisms in the circulating cooling water;
s12, after the residual chlorine content is reduced to 0.1mg ∙ L -1, adding a microbial agent and a nutritional agent in proportion through a dosing pipeline to construct a microecological system, wherein the method comprises the following steps of:
s121, after the residual chlorine content is reduced to 0.1mg ∙ L -1, adding a microbial agent according to 0.01% through a dosing pipeline, and adding a nutritional agent according to 0.03%;
s122, measuring an initial pH value-H0 of circulating cooling water and a pH value-H1 after 48 hours of operation, judging whether H1 is less than H0, if so, executing a step S123; if not, adding 0.005% microbial agent again;
s123, judging whether H1 is more than 8, if so, supplementing 0.015% of nutrient; if not, entering step S2;
S2, calculating a concentration multiple N;
S3, performing operation control according to the concentration multiple, pH and predicted value of instantaneous corrosion rate of the circulating cooling water, wherein the operation control comprises the following steps:
S31, judging whether the concentration multiple N is more than 5 at the time t k, if so, performing the step S32, and if not, performing the step S33;
s32, judging whether the pH value of the circulating cooling water meets 7.5 < pH value < 8.2, if so, controlling the circulating cooling water system to continue to operate according to preset conditions; if not, adding microbial agent or starting a water supplementing pump to run, and when the pH is less than 7.5, starting the water supplementing pump to supplement water by 2-5%; when the pH is more than 8.2, 0.005% of microbial agent is added;
S33, judging whether the pH value of the circulating cooling water is less than 8.2, if so, entering a step S34; if not, supplementing 0.006% of microbial agent;
S34, judging whether the pH value of the circulating cooling water is less than 7.5, if so, starting a water supplementing pump and supplementing water by 5-10%; if not, go to step S35;
S35, judging whether the pH value of the circulating cooling water is less than 7.7, if so, entering a step S36; if not, controlling the circulating cooling water system to continue to run according to preset conditions;
S36, calculating and judging whether the predicted value X k+1 ' of the instantaneous corrosion rate at the moment t k+1 is smaller than A according to GM (1, 1), if yes, controlling the circulating cooling water system to continue to operate according to preset conditions; if not, the water supplementing pump and the sewage pump are started.
2. The circulating cooling water operation control method according to claim 1, wherein the predicted value X k+1 ' of the instantaneous corrosion rate is calculated using the following formula:
；
wherein: x-instantaneous corrosion rate of metal in mm/year;
k-time series, unit year;
a-the coefficient of development;
u-grey coefficient of action.
3. The circulation cooling water operation control method according to claim 1, wherein the concentration multiple N in step S2 is calculated using the following formula;
；
Wherein: kappa i -real-time conductivity value of circulating cooling water, mu s/cm; kappa 0 -conductivity value of the circulating water, mu s/cm.
4. The circulating cooling water operation control method according to claim 1, wherein the circulating cooling water system comprises a cooling tower, a circulating water tank, a first circulating water pipeline, a second circulating water pipeline, a sewage drain pipeline, a water supplementing pipeline and a condenser, the circulating water output end of the circulating water tank is connected with one end of the water side of the condenser through the first circulating water pipeline, the other end of the water side of the condenser is connected with the circulating water input end of the cooling tower through the second circulating water pipeline, a pH sensor, a corrosion rate meter and a second conductivity meter are arranged on the second circulating water pipeline, the pH sensor and the corrosion rate meter are all close to the condenser, the first conductivity meter and the water supplementing pump are sequentially arranged on the water supplementing pipeline, and the sewage drain pump is arranged on the sewage drain pipeline.
5. The method according to claim 4, wherein the circulating cooling water system further comprises a control system electrically connected to the pH sensor, the first conductivity meter, the second conductivity meter, the corrosion rate meter, the water supplementing pump, and the sewage pump, respectively.
6. The circulation cooling water operation control method according to claim 1, wherein the concentration multiple N of the circulation cooling water is controlled to be between 12 and 15 times.
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