A self-learning method for adding scale inhibitor with slow release

Abstract

The present invention provides a self-learning slow-release scale inhibitor dosing method. By continuously measuring and statistically analyzing the environmental indicators in the circulating water, the optimal dosing amount calculation method under corresponding conditions is given. At the same time, through software programming, the dosing equipment gives a real-time dosing amount adjustment scheme for circulating water with different conditions. Meanwhile, the dosing equipment is endowed with a self-learning function through statistics. It solves the problem in the prior art that the dosing amount cannot be controlled according to the actual water quality situation and equipment requirements. It realizes the function of dosing different dosages of drugs corresponding to different water quality situations and equipment materials, solves the problems of excessive drug waste and insufficient drug dosing affecting the service life of the equipment, and achieves the effects of saving water and increasing the service life of the equipment. It has advantages such as environmental protection, energy conservation, and water conservation.

Description

Technical Field

[0001] The present invention belongs to the field of industrial circulating water, and specifically relates to a self-learning type slow-release scale inhibitor dosing method. Background Art

[0002] Industrial water consumption accounts for a large part of the total water consumption, and the efficiency of industrial water use in China needs to be further improved.

[0003] In the steel industry, according to the latest survey in 2019, the circulating water used in the steel industry in China accounts for 97.98% of the total water consumption. Experts believe that only the steel industry can save 40%-60% of water. Therefore, improving the utilization rate of circulating water is the key to saving industrial water.

[0004] In existing industrial circulating water applications, different protection equipment and water temperatures result in different requirements for circulating water quality, and different amounts of chemical agents need to be added during use. Currently, the dosing systems on the market are fixed-dose systems and cannot control the chemical dosing amount in the circulating system according to the actual water quality and equipment requirements. Summary of the Invention

[0005] The purpose of the present invention is to provide a self-learning type slow-release scale inhibitor dosing method to control the chemical dosing amount according to the actual water quality and equipment requirements.

[0006] The purpose of the present invention is achieved by the following technical means. A self-learning type slow-release scale inhibitor dosing method includes the following steps:

[0007] S1. First dosing: If no chemical agent has been added before, perform the first dosing; otherwise, perform cyclic dosing.

[0008] S2. Cyclic dosing: The cyclic chemical dosing amount V3 = , where Q4 is the total makeup water volume of the circulating system, C4 is the set chemical agent concentration in the circulating system during the circulation stage, N is the concentration ratio, and C3 is the concentration of the cyclic dosing chemical agent during the circulation stage.

[0009] S3. pH value correction: Detect the pH value of the circulating water. If the pH value is not between 7 and 9.2, adjust the pH value of the circulating water. If it is between 7 and 9.2, obtain the first corrected cyclic chemical dosing amount V3' according to the Langelier Saturation Index L.S.I. If -1 ≤ L.S.I ≤ 0, then V3' = 90%V3. The dosing system doses according to the first corrected cyclic chemical dosing amount V3', and detect the total iron content C Fe in the circulating water and the total iron content C Fe补 in the makeup water. If C Fe ≤ 1.2×N×C Fe补, the pH value, V3', C1, C2, C3, V2, Q4, and N are output to the self-learning system as self-learning samples; if not, no output is made; where the concentration of the first chemical addition C1, the total water volume of the circulation system V2, and the chemical concentration C2 in the circulation system;

[0010] If 0 < L.S.I or L.S.I < -1, then V3' = (10% + 1)V3, and proceed to the next correction;

[0011] S4. Calcium ion content correction. Detect the calcium ion Ca in the circulating water 2+ content P. If P < 200 mg / L, then the second corrected circulating chemical dosage V3'' = 90%V3'. The chemical dosing system doses according to the second corrected circulating chemical dosage V3'', and detects the total iron content C in the circulating water Fe and the total iron content C in the make-up water Fe补 , if C Fe ≤ 1.2×N×C Fe补 , then the calcium ion Ca 2+ content P, V3'', C1, C2, C3, V2, Q4, and N are output to the self-learning system as self-learning samples; if not, no output is made;

[0012] If P ≥ 200 mg / L, then V3'' = (1 + 10%)V3', and proceed to the next correction;

[0013] S5. Magnesium ion, chloride ion, and silica content correction. Detect the magnesium ion Mg in the circulating water 2+ content R, mg / L, the silica SiO2 content S, mg / L, and the chloride ion Cl - content V, mg / L;

[0014] If R×S ≤ 15000 and V ≤ 500 mg / L, then the third corrected circulating chemical dosage V3''' = V3''

[0015] , the chemical dosing system doses according to the third corrected circulating chemical dosage V3''', and detects the total iron content C in the circulating water Fe and the total iron content C in the make-up water Fe补 , if C Fe ≤ 1.2×N×C Fe补 , then R, S, V, V3''', C1, C2, C3, V2, Q4, and N are output to the self-learning system as self-learning samples; if not, no output is made;

[0016] S6. Establish a self-learning system. According to the self-learning samples output each time of dosing, establish a self-learning system to obtain the pH value, calcium ion Ca 2+ content P, magnesium ion Mg 2+Content R, silica dioxide (SiO2) content S, and chloride ion Cl - A self-learning system with content V as the independent variable and the chemical dosing amount as the dependent variable. When in use, the chemical dosing amount is given according to the makeup water volume of the circulating water system each time.

[0017] In the above S1, the initial chemical dosing amount is obtained based on the initial dosing agent concentration C1, the total water volume V2 of the circulating system, and the agent concentration C2 in the circulating system. The initial agent dosing amount is V1, and the dosing system doses the agent according to V1. ; Otherwise, perform self-learning cyclic dosing.

[0018] When not performing self-learning cyclic dosing but only cyclic dosing, the dosing system doses according to the cyclic agent dosing amount V3, and then detects the total iron content C of the circulating water. Fe And the total iron content C in the makeup water. Fe补 If C Fe ≤ 1.2×N×C Fe补 , then output V3, C1, C2, C3, V2, Q4, and N to the self-learning system as self-learning samples; if not, do not output.

[0019] In the above S4, the conductivity of the circulating water is also detected. If the conductivity of the cooling water is greater than the predetermined value, or the silica dioxide (SiO2) content S > 175 mg / L, or the chloride ion Cl - content V > 500 mg / L, if any of the three conditions is met, make up water through the makeup water valve or discharge sewage through the sewage discharge valve.

[0020] In the above S3, if P ≥ 200 mg / L, detect the phosphate content Y in the circulating water and the makeup water phosphate content Y0. If Y0 ≤ Y, then V3'' = V3', and the dosing system doses according to the second corrected cyclic agent dosing amount V3'', and detects the total iron content C of the circulating water. Fe And the total iron content C in the makeup water. Fe补 If C Fe ≤ 1.2×N×C Fe补 , then output the phosphate content Y, the makeup water phosphate content Y0, V3'', C1, C2, C3, V2, Q4, and N to the self-learning system as self-learning samples. If not, do not output;

[0021] If Y0 > Y, then V3'' = (1 + 10%)V3', and enter the correction of magnesium ion, chloride ion, and silica dioxide content.

[0022] The beneficial effects of the present invention are as follows: By continuously measuring and statistically analyzing environmental indicators such as the makeup water volume, pH value, Ca2+, Mg2+, phosphate, Cl-, conductivity, and total iron in the circulating water, the optimal chemical dosing calculation method under corresponding conditions is given, and the chemical dosing equipment is endowed with a self-learning function through statistics. It solves the problem in the prior art that the chemical dosing amount cannot be controlled according to the actual water quality situation and equipment requirements. It realizes the function of dosing different dosages of drugs corresponding to different water quality situations and equipment materials, solves the problems of excessive drug waste and insufficient drug dosing affecting the service life of the equipment, and achieves the effects of saving water and increasing the service life of the equipment. It has the advantages of environmental protection, energy conservation, and water conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the process of this application;

[0024] The present invention will be further described in detail below with reference to the drawings and embodiments. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025]

Embodiment 1

[0026] As Figure 1 shown, a self-learning slow-release scale inhibitor dosing method includes the following steps:

[0027] S1. First dosing: If the agent has not been dosed before, first dosing is carried out; otherwise, cyclic dosing is carried out.

[0028] S2. Cyclic dosing: The cyclic agent dosing amount V3 = , where Q4 is the total makeup water volume of the circulation system, C4 is the set agent concentration in the circulation system during the circulation stage, N is the concentration multiple, and C3 is the cyclic dosing agent concentration during the circulation stage.

[0029] S3. pH value correction: Detect the pH value of the circulating water. If the pH value is not between 7 and 9.2, adjust the pH value of the circulating water. If it is between 7 and 9.2, obtain the first corrected cyclic agent dosing amount V3' according to the Langelier saturation index L.S.I. If -1 ≤ L.S.I ≤ 0, then V3' = 90%V3, and the dosing system doses according to the first corrected cyclic agent dosing amount V3', and detect the total iron content C Fe in the circulating water and the total iron content C Fe补 in the makeup water. If C Fe ≤ 1.2×N×C Fe补 , then output the pH value, V3', C1, C2, C3, V2, Q4, and N to the self-learning system as self-learning samples; if not, do not output; where the first dosing agent concentration C1, the total water volume V2 of the circulation system, and the agent concentration C2 in the circulation system.

[0030] If 0 < L.S.I or L.S.I < -1, then V3' = (10% + 1)V3, and proceed to the next correction;

[0031] S4. Calcium ion content correction. Detect the calcium ion Ca 2+ content P in the circulating water. If P < 200 mg / L, then the second corrected dosage of the circulating agent V3'' = 90%V3'. The dosing system doses according to the second corrected dosage of the circulating agent V3'', and detects the total iron content C Fe in the circulating water and the total iron content C Fe补 in the make-up water. If C Fe ≤ 1.2 × N × C Fe补 , then output the calcium ion Ca 2+ content P, V3'', C1, C2, C3, V2, Q4, and N to the self-learning system as self-learning samples. If not, then do not output;

[0032] If P ≥ 200 mg / L, then V3'' = (1 + 10%)V3', and proceed to the next correction;

[0033] S5. Magnesium ion, chloride ion, and silica content correction. Detect the magnesium ion Mg 2+ content R, mg / L, the silica SiO2 content S, mg / L, and the chloride ion Cl - content V, mg / L in the circulating water;

[0034] If R × S ≤ 15000 and V ≤ 500 mg / L, then the third corrected dosage of the circulating agent V3''' = V3''.

[0035] The dosing system doses according to the third corrected dosage of the circulating agent V3''', and detects the total iron content C Fe in the circulating water and the total iron content C Fe补 in the make-up water. If C Fe ≤ 1.2 × N × C Fe补 , then output R, S, V, V3''', C1, C2, C3, V2, Q4, and N to the self-learning system as self-learning samples; if not, then do not output;

[0036] S6. Establish a self-learning system. According to the self-learning samples output each time of dosing, establish a self-learning system to obtain a self-learning system with the pH value, calcium ion Ca 2+ content P, magnesium ion Mg 2+ content R, silica SiO2 content S, and chloride ion Cl - content V as independent variables and the dosing amount as the dependent variable. When in use, give the dosing amount according to the make-up water volume of the circulating water system each time.

[0037] As Figure 1 shown,

[0038] First, determine whether this chemical addition is the first one. If it is, perform the first chemical addition according to the normal process and record the concentration C1 of the first added chemical agent.

[0039] If it is not the first chemical addition, enter the self-learning process of cyclic chemical addition.

[0040] During cyclic chemical addition, the cyclic chemical dosage V3 = , where Q4 is the total makeup water volume of the cyclic system, C4 is the set chemical agent concentration in the cyclic system during the cyclic stage, N is the concentration multiple, and C3 is the concentration of the cyclicly added chemical agent during the cyclic stage.

[0041] Among them, N is the concentration multiple of the circulating water, which is set by itself during production. Q4 is the total makeup water volume of the cyclic system and is the makeup water volume fed back by the flowmeter of the makeup water pipeline. C4 is a set value. C3 is the concentration of the chemical agent used in this cyclic chemical addition.

[0042] Enter the self-learning mode.

[0043] 1. Conduct pH correction learning.

[0044] The pH value is an important indicator for the dosage of the slow-release scale inhibitor. If the pH value is controlled too high, scaling is likely to occur on the equipment surface. If the pH value is controlled too low, it will damage the membrane and enhance corrosion. Therefore, through experiments, it is found that it is appropriate to control the pH value between 7 and 9.2.

[0045] Detect the pH value of the circulating water. If the pH value is not between 7 and 9.2, adjust the pH value of the circulating water. If it is between 7 and 9.2, obtain the first corrected cyclic chemical dosage V3' according to the Langelier Saturation Index L.S.I. If -1 ≤ L.S.I ≤ 0, the system can appropriately reduce the dosage of the corrosion and scale inhibitor, that is, make V3' = 90%V3, and the chemical addition system adds chemicals according to the first corrected cyclic chemical dosage V3'.

[0046] And detect and obtain the total iron content C of the circulating water Fe and the total iron content C in the makeup water Fe补 , if C Fe ≤ 1.2 × N × C Fe补 , then output the pH value, V3', C1, C2, C3, V2, Q4, and N to the self-learning system as self-learning samples. This indicates that the chemical dosage after pH correction is sufficient to achieve scale prevention and no further correction is required. The same applies to the remaining steps. When the self-learning samples are output, it means that the current chemical dosage can achieve scale prevention and no other correction is needed; if C Fe ≤ 1.2 × N × C Fe补 is not satisfied, it means that this addition does not require learning, and the chemical addition system still adds chemicals according to the first corrected cyclic chemical dosage V3'.

[0047] However, the parameters of this addition are not output; among them, the concentration of the first addition of the chemical C1, the total water volume of the circulation system V2 (the total water volume that the entire system can hold, a fixed value), and the concentration of the chemical in the circulation system C2 (during the first chemical addition stage, the set chemical concentration to be achieved in the circulation system, which can be set according to actual needs).

[0048] If the pH value feedback by the pH sensor is not between 7 and 9.2, the system will alarm to remind to adjust the pH of the system.

[0049] L.S.I = pH - pH S pH S = (9.3 + A + B) - (C + D)

[0050] According to the feedback data of the thermometer and the laboratory data system, the corresponding data is found in Table 1-1, and the L.S.I value is calculated.

[0051] Table 1-1

[0052]

[0053] If 0 < L.S.I or L.S.I < -1, it means that only pH correction cannot solve the problem. Then the system can appropriately increase the dosage of the corrosion and scale inhibitor and enter the next correction, V3' = (10% + 1)V 3， , and enter the next correction;

[0054] 2. Calcium ion content correction: If only adjusting the pH cannot solve the problem, then further correction is carried out through the calcium ion content.

[0055] Ca 2+ The measurement of can judge the scaling situation of the equipment. If the content of Ca 2+ is low, it means that the equipment is severely corroded; if it is high, it means that the equipment is severely scaled. At the same time, the greater the change in Ca 2+ , the more serious the scaling of the system. Therefore, the dosage can be appropriately adjusted according to the change in Ca 2+ . It is found through experiments that from the perspective of corrosion and scale inhibition, the amount of Ca 2+ should be controlled at 30 - 200 mg / L.

[0056] Detect the calcium ion Ca 2+ content P of the circulating water. If P < 200 mg / L, then the second corrected dosage of the circulating chemical V3'' = 90%V3'. The dosing system doses according to the second corrected dosage of the circulating chemical V3'', and the total iron content C Fe of the circulating water and the total iron content C Fe补 in the make-up water are detected. If C Fe ≤1.2×N×C Fe补 , then the calcium ion Ca 2+ is output to the self-learning systemContents of P, V3'', C1, C2, C3, V2, Q4 and N, as self-learning samples, if not, do not output;

[0057] If P ≥ 200 mg / L, it indicates that the dosage of the chemical agent needs to be increased, then V3'' = (1 + 10%)V3', and enter the next step of correction;

[0058] When P ≥ 200 mg / L, the phosphate content Y in the circulating water and the phosphate content Y0 in the make-up water can be further detected, rather than choosing to include the next step of correction. If the phosphate detection passes, it indicates good anti-rust effect, then the data can be output as self-learning samples. If the detection fails, enter the next step of correction for the contents of magnesium ions, chloride ions and silicon dioxide.

[0059] In S3, if P ≥ 200 mg / L, detect the phosphate content Y in the circulating water and the phosphate content Y0 in the make-up water. If Y0 ≤ Y, then V3'' = V3'. The dosing system doses according to the second corrected circulating water agent dosage V3'', and detects the total iron content C in the circulating water Fe and the total iron content C in the make-up water Fe补 , if C Fe ≤ 1.2 × N × C Fe补 , then output the phosphate content Y, the phosphate content Y0 in the make-up water, V3'', C1, C2, C3, V2, Q4 and N to the self-learning system as self-learning samples. If not, do not output;

[0060] If Y0 > Y, then V3'' = (1 + 10%)V3', and enter the correction of the contents of magnesium ions, chloride ions and silicon dioxide.

[0061] In the correction of calcium ion content, if P ≥ 200 mg / L, the phosphate content Y in the circulating water and the phosphate content Y0 in the make-up water can be further detected. If it satisfies Y0 ≤ Y, then V3'' = V3'. Output the phosphate content Y, the phosphate content Y0 in the make-up water, V3'', C1, C2, C3, V2, Q4 and N to the self-learning system as self-learning samples.

[0062] If Y0 > Y, then V3'' = (1 + 10%)V3', and enter the correction of the contents of magnesium ions, chloride ions and silicon dioxide.

[0063] 3. Correction of the contents of magnesium ions, chloride ions and silicon dioxide, detect the magnesium ion Mg 2+ content R, mg / L, silicon dioxide SiO2 content S, mg / L and chloride ion Cl - content V, mg / L;

[0064] If R×S≤15000 and V≤500mg / L, then the dosing amount of the third corrected cycle agent V3''' = V3''.

[0065] The dosing system doses according to the dosing amount of the third corrected cycle agent V3''', and the total iron content C of the circulating water is detected. Fe and the total iron content C in the make-up water Fe补 . If C Fe ≤1.2×N×C Fe补 , then R, S, V, V3''', C1, C2, C3, V2, Q4 and N are output to the self-learning system as self-learning samples; if not, they are not output.

[0066] Mg 2+ , SiO2 is likely to form magnesium silicate precipitation. Therefore, it is required that the two in the cooling water satisfy [Mg 2+ (mg / L) × [SiO2] (mg / L) ≤ 15000;

[0067] Cl - is mainly related to corrosion, and conductivity is related to scaling. Cl - , conductivity is mainly used to control the concentration ratio of circulating cooling water. The concentration ratio of cooling water has a linear relationship with its conductivity. Cl - , the measurement of conductivity can realize the automation of controlling the concentration ratio of circulating cooling water.

[0068] Theoretically, the total iron content of the circulating water should be equal to the total iron content of the make-up water multiplied by the concentration ratio. At the same time, the lower the total iron content, the better the anti-corrosion effect of the system. This index can be analyzed by long-term detection and segmentation according to the operation of the system, and used as an evaluation index for the phased anti-corrosion effect. C Fe ≤1.2*N*C Fe补 indicates that the anti-corrosion effect is good and can be output as a self-learning sample; C Fe >1.2*N*C Fe补 indicates that the anti-corrosion effect is poor and is not output as a self-learning sample

[0069] In S1, the first dosing amount is obtained according to the first dosing agent concentration C1, the total volume of water in the circulation system V2 and the agent concentration C2 in the circulation system, and the first agent dosing amount V1. The dosing system doses according to V1. ; otherwise, self-learning cycle dosing is performed.

[0070] When self-learning cycle dosing is not performed and only cycle dosing is carried out, the dosing system doses according to the circulating agent dosing amount V3, and then the total iron content C of the circulating water is detected Fe and the total iron content C in the make-up water Fe补 . If C Fe ≤1.2×N×CFe补 If so, output V3, C1, C2, C3, V2, Q4, and N to the self-learning system as self-learning samples; if not, do not output.

[0071] When self-learning is not performed, only the circulating chemical dosage V3 = is not corrected.

[0072] In S4, the conductivity of the circulating water is also detected. If the conductivity of the cooling water is greater than the predetermined value, or the content of silicon dioxide SiO2 is S > 175 mg / L, or the content of chloride ions Cl - is V > 500 mg / L, and any one of the three is satisfied, then make up water through the make-up water valve or discharge sewage through the blowdown valve. It indicates that the salt content in the water quality is too high or the concentration of some ions is too high. The operator can choose to make up water through the make-up water valve or discharge sewage through the blowdown valve according to their will.

[0073] After each water addition or sewage discharge, start the detection again from the pH value correction.

[0074] In each chemical addition cycle, a dosage (one of the circulating chemical dosage V3, the first corrected circulating chemical dosage V3', the second corrected circulating chemical dosage V3'', the third corrected circulating chemical dosage V3''') is always output, so as to obtain a self-learning system with pH value, calcium ion Ca 2+ content P, magnesium ion Mg 2+ content R, silicon dioxide SiO2 content S, chloride ion Cl - content V, phosphate content Y, and make-up water phosphate content Y0 as independent variables and the chemical dosage as the dependent variable. The system continuously adjusts and learns the landing point of the dependent variable, statistically obtains the corresponding accurate values under different conditions, and finally the system identifies the landing point law of the dependent variable to form a new calculation standard.

[0075] During use, detect and input the pH value, calcium ion Ca 2+ content P, magnesium ion Mg 2+ content R, silicon dioxide SiO2 content S, chloride ion Cl - content V, phosphate content Y, and make-up water phosphate content Y0. The known initial chemical dosage concentration C1, the chemical dosage concentration C2 in the circulating system, the circulating chemical dosage concentration C3 in the circulating stage, the total volume of water in the circulating system V2, the total make-up water volume Q4 in the circulating system, and the concentration multiple N are also input. Then, according to the make-up water volume of each circulating water system each time, the self-learning system can give the optimal chemical dosage V3.

Claims

1. A self-learning slow-release scale inhibitor dosing method, characterized in that, It includes the following steps: S1. Initial dosing. If the agent has not been dosed before, perform the initial dosing; otherwise, perform cyclic dosing; S2. Cyclic dosing, the cyclic chemical dosing volume V3 = , where Q4 is the total makeup water volume of the circulation system, C4 is the set chemical concentration in the circulation system during the circulation stage, N is the concentration ratio, and C3 is the chemical concentration for cyclic dosing in the circulation system during the circulation stage; S3. pH value correction: Detect the pH value of the circulating water. If the pH value is not between 7 and 9.2, adjust the pH value of the circulating water. If it is between 7 and 9.2, obtain the first corrected dosage V3' of the circulating agent according to the Langelier Saturation Index L.S.I. If -1 ≤ L.S.I. ≤ 0, then V3' = 90%V3. The dosing system doses according to the first corrected dosage V3' of the circulating agent, and detect the total iron content C of the circulating water Fe and the total iron content C in the make-up water Fe补 , if C Fe ≤ 1.2×N×C Fe补 , then output the pH value, V3', C1, C2, C3, V2, Q4 and N to the self-learning system as self-learning samples; if not, do not output; where C1 is the concentration of the first added agent, V2 is the total volume of water in the circulating system, and C2 is the concentration of the agent in the circulating system If 0 < L.S.I or L.S.I < -1, then V3' = (10% + 1)V3, and proceed to the next correction; S4. Calcium ion content correction, detecting the calcium ion Ca in the circulating water 2+ content P. If P < 200 mg / L, then the second corrected dosage of the circulating agent V3'' = 90%V3'. The dosing system doses according to the second corrected dosage of the circulating agent V3'', and the total iron content C in the circulating water is detected Fe and the total iron content C1 in the make-up water Fe补 . If C Fe ≤ 1.2 × N × C Fe补 , then output the calcium ion Ca 2+ content P, V3'', C1, C2, C3, V2, Q4 and N to the self-learning system as self-learning samples. If not, do not output; If P ≥ 200 mg / L, then V3'' = (1 + 10%)V3', and proceed to the next correction; S5, Magnesium Ion, Chloride Ion and Silicon Dioxide Content Correction, Detecting Magnesium Ion Mg 2+ Content R, mg / L, Silicon Dioxide SiO2 Content S, mg / L and Chloride Ion Cl - Content V, mg / L; If R × S ≤ 15000 and V ≤ 500 mg / L, then the dosing amount of the third correction cycle V3''' = V3''; The chemical dosing system doses chemicals according to the third corrected circulating chemical dosage V3''', and detects the total iron content C of the circulating water Fe and the total iron content C in the make-up water Fe补 . If C Fe ≤1.2×N×C Fe补 , then R, S, V, V3''', C1, C2, C3, V2, Q4 and N are output to the self-learning system as self-learning samples; if not, no output is made S6. Establish a self-learning system. Based on the self-learning samples output during each dosing, establish a self-learning system to obtain a self-learning system with the pH value, calcium ion Ca 2+ content P, magnesium ion Mg 2+ content R, silicon dioxide SiO2 content S, and chloride ion Cl - content V as independent variables and the chemical dosing amount as the dependent variable. When in use, give the chemical dosing amount according to the makeup water volume of the circulating water system each time.

2. The self-learning type slow-release scale inhibitor dosing method according to claim 1, characterized in that: In the above S1, the first chemical dosage is obtained as follows: based on the concentration C1 of the first added chemical, the total water volume V2 of the circulation system, and the chemical concentration C2 in the circulation system, the first chemical dosage V1 is calculated, and the dosing system adds chemicals according to V1. Otherwise, self-learning cyclic chemical dosing is performed.

3. The self-learning type slow-release scale inhibitor dosing method according to claim 2, characterized in that: When self-learning loop chemical dosing is not performed and only loop chemical dosing is carried out, the chemical dosing system doses chemicals according to the loop chemical dosage V3, and then detects the total iron content C of the circulating water Fe and the total iron content C in the make-up water Fe补 , if C Fe ≤1.2×N×C Fe补 , then output V3, C1, C2, C3, V2, Q4 and N to the self-learning system as self-learning samples; if not, do not output.

4. The self-learning type slow-release scale inhibitor dosing method according to claim 1, characterized in that: In S4, the conductivity of the circulating water is also detected. If the conductivity of the circulating cooling water is greater than a predetermined value, or the content S of silicon dioxide SiO2 is greater than 175 mg / L, or the content V of chloride ions Cl - is greater than 500 mg / L, and any one of the three conditions is met, then make up water through the make-up water valve or discharge sewage through the sewage discharge valve.

5. The self-learning type slow-release scale inhibitor dosing method according to claim 1, characterized in that: In S3, if P ≥ 200 mg / L, detect the phosphate content Y in the circulating water and the phosphate content Y0 in the make-up water. If Y0 ≤ Y, then V3'' = V3', and the dosing system doses according to the second corrected circulating chemical dosing amount V3'', and detect the total iron content C in the circulating water Fe and the total iron content C in the make-up water Fe补 , if C Fe ≤ 1.2 × N × C Fe补 , then output the phosphate content Y, the make-up water phosphate content Y0, V3'', C1, C2, C3, V2, Q4, and N to the self-learning system as self-learning samples. If not, do not output; If Y0 > Y, then V3'' = (1 + 10%)V3', and proceed to the correction of the magnesium ion, chloride ion, and silica content.

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