A method for measuring water volume in a circulating cooling water system

Abstract

The present invention relates to the technical field of industrial circulating cooling water treatment. Specifically, the present invention discloses a method for measuring the water volume of a circulating cooling water system, comprising the following steps: (1) measuring the initial conductivity of a water sample in the system, which is recorded as S0; (2) estimating the water volume V0 of the system, adding sodium chloride mg, and circulating the system until the conductivity does not change, and measuring the conductivity as S1; and (3) calculating the water volume V according to formula V. The method for measuring the water volume of a circulating cooling water system of the present invention can effectively measure the water volume of the circulating cooling water system with high accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of industrial circulating cooling water treatment, and in particular to a method for measuring the water volume of a circulating cooling water system. Background Art

[0002] During industrial circulating cooling water treatment, it's essential to first determine the system's water volume. This is crucial for calculating dosages during cleaning, pre-filming, and routine dosing. Determining the system's water volume is fundamental to industrial circulating cooling water treatment. Existing methods rely on measuring pipe lengths and diameters, as well as the dimensions of heat exchangers, tanks, and water towers, using a ruler and then calculating the volume. However, this method is labor-intensive and subject to significant errors for systems with complex pipes and numerous heat exchangers. Therefore, determining the system's water volume has become a pressing technical challenge for those skilled in the art. Summary of the Invention

[0003] The present invention provides a method for measuring the water volume of a circulating cooling water system, which can effectively measure the water volume of the circulating cooling water system with high accuracy.

[0004] The present invention solves its technical problems by adopting the following technical solutions:

[0005] A method for measuring the water volume of a circulating cooling water system comprises the following steps:

[0006] (1) The initial conductivity of the water sample in the measurement system is recorded as S0;

[0007] (2) Estimate the water volume V0 of the system, add sodium chloride mg, circulate the system until the conductivity does not change, and measure the conductivity and record it as S1;

[0008] (3) According to the formula V= , calculate the water volume V.

[0009] The inventors of the present invention have found through extensive research that the above method can effectively detect the water volume of the circulating cooling water system. However, the inventors have further found that when the above system is used to detect a new system (the new system referred to in the present invention refers to a system that has just been built and has not yet been put into use, and the old system refers to a system that has been used many times;), the water volume of the system can be effectively detected with high accuracy.

[0010] However, the inventors discovered that when the aforementioned method was used to measure the water volume of an old system, the measured volume deviated from the actual volume. The inventors further discovered that this may be due to the poorer water quality of the old system compared to new water, with higher levels of suspended matter, oil, calcium hardness, and chloride ions, which could affect the accuracy of the measurement. Therefore, improving the accuracy of water volume measurement in the old system became a pressing technical issue for the inventors.

[0011] As a preferred solution, step (1) is specifically as follows:

[0012] Turn on the circulating water pump in the system. When the water level reaches the normal operating level, take a water sample to measure the initial conductivity of the water sample in the system and record it as S0.

[0013] As a preferred solution, the material-liquid ratio of the amount of sodium chloride added mg to the estimated water volume V0 of the system is 10g:1m 3 .

[0014] As a preferred embodiment, the sodium chloride is industrial salt.

[0015] As a preferred solution, when the circulating cooling water system is an old system, the system is pre-treated before step (1).

[0016] As a preferred solution, the pretreatment is to pretreat the system with a composite water treatment agent.

[0017] As a preferred solution, the material-liquid ratio of the composite water treatment agent dosage to the estimated system water volume V0 is 2~6g:1m 3 .

[0018] As a preferred embodiment, the composite water treatment agent comprises, by weight: 1 to 2 parts of sodium molybdate, 1 to 4 parts of methylbenzotriazole, 2 to 4 parts of tea polyphenols, 3 to 5 parts of dimethyldodecylbenzylammonium bromide, 4 to 8 parts of sodium lignin sulfonate, 5 to 9 parts of modified starch, and 65 to 80 parts of deionized water.

[0019] The inventors discovered that adding the aforementioned composite water treatment agent to the system before testing can effectively eliminate experimental interference and improve detection accuracy. Furthermore, the composite water treatment agent, after pre-treatment in the system, has no effect on subsequent experimental results and will not affect subsequent measurements.

[0020] As a preferred embodiment, the preparation method of the modified starch is:

[0021] (11) Add 1 part by weight of starch to 3-6 parts by weight of the mixed acid solution, and stir at a speed of 200-600 rpm for 60-120 min to obtain a starch mixture;

[0022] (12) Add 1-4 parts by weight of phytic acid, 1-3 parts by weight of ammonium bicarbonate, and 0.1-0.5 parts by weight of silane coupling agent KH550 to 10-20 parts by weight of deionized water to prepare a modified solution;

[0023] (13) Add 1 part by weight of the modified solution into 2-5 parts by weight of the starch mixture, stir at 200-500 rpm for 40-100 min, filter, and dry to obtain modified starch.

[0024] The modified starch prepared as above can effectively eliminate interference, is degradable, and has a good treatment effect, while the use of other substances cannot achieve the above effects.

[0025] As a preferred embodiment, the preparation method of tea polyphenols is as follows:

[0026] (21) Grind fresh white tea leaves and pass them through a 60-100 mesh sieve to obtain white tea powder;

[0027] (22) dissolving white tea leaf powder in a mixed solution of anhydrous ethanol and ether, mixing uniformly, and centrifuging to obtain pretreated white tea leaf powder; the weight ratio of the camellia seed meal powder to the mixed solution is 1:3-7, and the weight ratio of the anhydrous ethanol to the ether in the mixed solution is 1:0.5-2;

[0028] (23) Add the pretreated white tea leaf powder to deionized water, extract with ultrasound at 200-600W for 20-40min, filter, and collect the filtrate; the weight ratio of the pretreated white tea leaf powder to deionized water is 1:5-10;

[0029] (24) The pH of the filtrate was adjusted to 6.2-6.8, and the filtrate was loaded onto a HPD-600 macroporous adsorption resin column at a rate of 0.5-1.5 BV / h and an elution rate of 1-2 BV / h. 1-2 BV of the filtrate was washed with deionized water and 1-3 BV of the filtrate was washed with 40-60 wt% ethanol solution. The ethanol solution washings were collected and dried to obtain tea polyphenols.

[0030] As a preferred embodiment, the composite water treatment agent comprises, by weight: 1.2 to 2 parts of sodium molybdate, 1 to 3 parts of methylbenzotriazole, 2.5 to 4 parts of tea polyphenols, 3.2 to 5 parts of dimethyldodecylbenzylammonium bromide, 4 to 7 parts of sodium lignin sulfonate, 6 to 9 parts of modified starch, and 70 to 80 parts of deionized water.

[0031] As a preferred solution, the composite water treatment agent comprises, by weight: 1.6 parts of sodium molybdate, 2 parts of methylbenzotriazole, 3 parts of tea polyphenols, 4 parts of dimethyldodecylbenzylammonium bromide, 6 parts of sodium lignin sulfonate, 8 parts of modified starch, and 75.4 parts of deionized water.

[0032] The inventors further discovered that the composite water treatment agent, in terms of eliminating interference and improving measurement accuracy, has a significant synergistic effect when used in combination with tea saponin and modified starch.

[0033] Beneficial effects of the present invention: The system of the present invention can effectively measure the water volume of the circulating cooling water system with high accuracy. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] In the present invention, all parts are parts by weight.

[0036] Example 1

[0037] The circulating cooling water system described in this embodiment is a new system, that is, a system that has just been built and has not yet been put into practical use.

[0038] Experimental measurements have shown that the ratio of conductivity to industrial salt concentration is 2.3 microseconds per centimeter, which is equivalent to a sodium chloride concentration of 1 milligram per liter. That is, the conductivity will increase by 2.3 microseconds per centimeter for every 1 milligram per liter of sodium chloride added.

[0039] A method for measuring the water volume of a circulating cooling water system comprises the following steps:

[0040] (1) Turn on the circulating water pump in the system. When the water level reaches the normal operating level, take a water sample to measure the initial conductivity of the water sample in the system and record it as S0;

[0041] (2) Estimate the water volume V0 of the system, add industrial salt mg, circulate the system until the conductivity does not change, and measure the conductivity as S1; the material-liquid ratio of the amount of industrial salt added mg to the estimated water volume V0 of the system is 10g:1m 3 ;

[0042] (3) According to the formula V= , calculate the water volume V (unit: cubic meter).

[0043] A new chemical plant has a complex circulating cooling water system (after comparison, the company determined that its actual water volume is 9450m3). 3 ), there are nearly 100 shell and tube and plate heat exchangers.

[0044] The water volume is tested using the method according to the embodiment of the present invention.

[0045] A preliminary estimate of the water volume is 6,000 to 8,000 cubic meters. Based on 8,000 cubic meters, 80 kg of industrial salt was prepared. Before adding the industrial salt, the conductivity of the circulating cooling water was measured to be 235 μS / cm. With the fan turned off (no evaporation or concentration) and the circulating water pump running, the industrial salt was dissolved in 50-liter open plastic buckets and added to the system. The conductivity was then measured every 30 minutes. After two hours, the conductivity stabilized and stopped rising, reaching 255 μM / cm.

[0046] According to the formula, V= = =9200 m 3 ;Accuracy=9200 / 9400=97.35%.

[0047] Example 2

[0048] The circulating cooling water system described in this embodiment is an old system, that is, a system that has been used many times.

[0049] A method for measuring the water volume of a circulating cooling water system comprises the following steps:

[0050] (1) Turn on the circulating water pump in the system. When the water level reaches the normal operating level, take a water sample to measure the initial conductivity of the water sample in the system and record it as S0;

[0051] (2) Estimate the water volume V0 of the system, add industrial salt mg, circulate the system until the conductivity does not change, and measure the conductivity as S1; the material-liquid ratio of the amount of industrial salt added mg to the estimated water volume V0 of the system is 10g:1m 3 ;

[0052] (3) According to the formula V= , calculate the water volume V (unit: cubic meter).

[0053] A circulating cooling water system in a chemical plant has a relatively complex pipeline. The system has been in use for nearly two years (after comparison, the company determined that its actual water volume is 7210 m 3 ), there are nearly 70 shell and tube and plate heat exchangers.

[0054] The water volume was tested using the method described in this example.

[0055] A preliminary estimate of the water volume was 5,000 to 6,500 cubic meters. Based on 6,500 cubic meters, 65 kg of industrial salt was prepared. Before adding the industrial salt, the conductivity of the circulating cooling water was measured to be 219 μS / cm. With the fan turned off (no evaporation or concentration) and the circulating water pump running, industrial sodium chloride was dissolved in 50-liter open plastic buckets and added to the system. Conductivity was then measured every 30 minutes. After 1.5 hours, the conductivity stabilized and stopped rising, reaching 247 μM / cm.

[0056] According to the formula, V= = =5339m 3 ;Accuracy rate = 5339 / 7210 = 74.05%.

[0057] Example 3

[0058] The circulating cooling water system described in this embodiment is an old system, that is, a system that has been used many times.

[0059] A method for measuring the water volume of a circulating cooling water system comprises the following steps:

[0060] (1) Pre-treat the system with a composite water treatment agent: add the composite water treatment agent to the system, and the material-liquid ratio of the composite water treatment agent dosage to the estimated system water volume V0 is 5g:1m 3 ;

[0061] (2) Turn on the circulating water pump in the system. When the water level reaches the normal operating level, take a water sample to measure the initial conductivity of the water sample in the system and record it as S0;

[0062] (3) Estimate the water volume V0 of the system, add industrial salt mg, circulate the system until the conductivity does not change, and measure the conductivity as S1; the material-liquid ratio of the amount of industrial salt added mg to the estimated water volume V0 of the system is 10g:1m 3 ;

[0063] (4) According to the formula V= , calculate the water volume V (unit: cubic meter).

[0064] The composite water treatment agent comprises, by weight, 1.6 parts of sodium molybdate, 2 parts of methylbenzotriazole, 3 parts of tea polyphenols, 4 parts of dimethyldodecylbenzylammonium bromide, 6 parts of sodium lignin sulfonate, 8 parts of modified starch, and 75.4 parts of deionized water.

[0065] The preparation method of the modified starch is:

[0066] (11) Adding 1 part by weight of starch to 5 parts by weight of a mixed acid solution, stirring at a speed of 200-600 rpm for 60-120 min to obtain a starch mixed solution; the mixed acid solution is prepared by mixing oxalic acid, tartaric acid, citric acid, and deionized water in a weight ratio of 1:1:1:17;

[0067] (12) Add 2.5 parts by weight of phytic acid, 1.5 parts by weight of ammonium bicarbonate, and 0.2 parts by weight of silane coupling agent KH550 to 15.8 parts by weight of deionized water to prepare a modified solution;

[0068] (13) 1 part by weight of the modified liquid was added dropwise to 3 parts by weight of the starch mixture, stirred at 400 rpm for 80 min, filtered, and dried to obtain modified starch.

[0069] The preparation method of the tea polyphenols is as follows:

[0070] (21) Grind fresh white tea leaves and pass them through an 80-mesh sieve to obtain white tea powder;

[0071] (22) dissolving white tea leaf powder in a mixed solution of anhydrous ethanol and ether, mixing uniformly, centrifuging at 5000 rpm for 10 min, and discarding the filtrate to obtain pretreated white tea leaf powder; the weight ratio of the camellia seed meal powder to the mixed solution is 1:5, and the weight ratio of anhydrous ethanol to ether in the mixed solution is 1:1;

[0072] (23) Add the pretreated white tea leaf powder to deionized water, extract with 500W ultrasonic wave for 30 minutes, filter, and collect the filtrate; the weight ratio of the pretreated white tea leaf powder to deionized water is 1:9;

[0073] (24) The pH of the filtrate was adjusted to 6.5, and the filtrate was loaded onto a HPD-600 macroporous adsorption resin column at a rate of 1 BV / h and an elution rate of 1.5 BV / h. 2 BV of the filtrate was washed with deionized water and 2 BV of the 50 wt% ethanol solution. The ethanol solution washings were collected and dried to obtain tea polyphenols.

[0074] A circulating cooling water system in a chemical plant has a relatively complex pipeline. The system has been in use for nearly a year and a half (after comparison, the company determined that its actual water volume is 7950 m 3 ), there are nearly 85 shell and tube and plate heat exchangers.

[0075] The water volume was tested using the method described in this example.

[0076] A preliminary estimate of the water volume was 6,800 to 7,800 cubic meters. Based on 7,800 cubic meters, 78 kg of industrial salt was prepared. The conductivity of the circulating cooling water before the addition of industrial salt was measured to be 216 μS / cm. With the fan turned off (no evaporation or concentration) and the circulating water pump running, industrial sodium chloride was dissolved in 50-liter open plastic buckets and added to the system. Conductivity was then measured every 30 minutes. After 2.5 hours, the conductivity stabilized and stopped rising, reaching 239 μM / cm.

[0077] According to the formula, V= = =7800m 3 ; Accuracy = 7800 / 7950 = 98.11%.

[0078] Example 4

[0079] The circulating cooling water system described in this embodiment is an old system, that is, a system that has been used many times.

[0080] A method for measuring the water volume of a circulating cooling water system comprises the following steps:

[0081] (1) Pre-treat the system with a composite water treatment agent: add the composite water treatment agent to the system, and the material-liquid ratio of the composite water treatment agent dosage to the estimated system water volume V0 is 3g:1m 3 ;

[0082] (2) Turn on the circulating water pump in the system. When the water level reaches the normal operating level, take a water sample to measure the initial conductivity of the water sample in the system and record it as S0;

[0083] (3) Estimate the water volume V0 of the system, add industrial salt mg, circulate the system until the conductivity does not change, and measure the conductivity as S1; the material-liquid ratio of the amount of industrial salt added mg to the estimated water volume V0 of the system is 10g:1m 3 ;

[0084] (4) According to the formula V= , calculate the water volume V (unit: cubic meter).

[0085] The composite water treatment agent comprises, by weight, 1 part of sodium molybdate, 4 parts of methylbenzotriazole, 2 parts of tea polyphenols, 5 parts of dimethyldodecylbenzylammonium bromide, 4 parts of sodium lignin sulfonate, 7 parts of modified starch, and 77 parts of deionized water.

[0086] The preparation method of the modified starch is:

[0087] (11) Add 1 part by weight of starch to 3 parts by weight of the mixed acid solution, and stir at 200 rpm for 120 min to obtain a starch mixture;

[0088] (12) Add 2 parts by weight of phytic acid, 1 part by weight of ammonium bicarbonate, and 0.2 parts by weight of silane coupling agent KH550 to 16.8 parts by weight of deionized water to prepare a modified solution;

[0089] (13) 1 part by weight of the modified liquid was added dropwise to 2 parts by weight of the starch mixture, stirred at 500 rpm for 40 min, filtered, and dried to obtain modified starch.

[0090] The preparation method of the tea polyphenols is as follows:

[0091] (21) Grind fresh white tea leaves and pass them through a 100-mesh sieve to obtain white tea powder;

[0092] (22) dissolving white tea leaf powder in a mixed solution of anhydrous ethanol and ether, mixing uniformly, centrifuging at 5000 rpm for 10 min, and discarding the filtrate to obtain pretreated white tea leaf powder; the weight ratio of the camellia seed meal powder to the mixed solution is 1:4, and the weight ratio of anhydrous ethanol to ether in the mixed solution is 1:1;

[0093] (23) Add the pretreated white tea powder to deionized water, extract with 400W ultrasonic wave for 30 minutes, filter, and collect the filtrate; the weight ratio of the pretreated white tea powder to deionized water is 1:5;

[0094] (24) The pH of the filtrate was adjusted to 6.2, and the filtrate was loaded onto a HPD-600 macroporous adsorption resin column at a rate of 0.5 BV / h and an elution rate of 1 BV / h. 1 BV of the filtrate was washed with deionized water and 1 BV of the 40 wt% ethanol solution. The ethanol solution washings were collected and dried to obtain tea polyphenols.

[0095] A circulating cooling water system in a chemical plant has a relatively complex pipeline. The system has been in use for nearly 1 year and 8 months (after comparison, the company determined that its actual water volume is 9580m3). 3 ), there are nearly 90 shell and tube and plate heat exchangers.

[0096] The water volume was tested using the method described in this example.

[0097] A preliminary estimate of the water volume was 8,500 to 9,500 cubic meters. Based on 9,500 cubic meters, 95 kg of industrial salt was prepared. Before adding the industrial salt, the conductivity of the circulating cooling water was measured to be 220 μS / cm. With the fan turned off (no evaporation or concentration) and the circulating water pump running, industrial sodium chloride was dissolved in 50-liter open plastic buckets and added to the system. Conductivity was then measured every 30 minutes. After three hours, the conductivity stabilized and stopped rising, reaching 244 μM / cm.

[0098] According to the formula, V= = =9104m 3 ;Accuracy rate = 9104 / 9580 = 95.03%.

[0099] Example 5

[0100] The circulating cooling water system described in this embodiment is an old system, that is, a system that has been used many times.

[0101] A method for measuring the water volume of a circulating cooling water system comprises the following steps:

[0102] (1) Pre-treat the system with a composite water treatment agent: add the composite water treatment agent to the system, and the material-liquid ratio of the composite water treatment agent dosage to the estimated system water volume V0 is 4g:1m 3 ;

[0103] (2) Turn on the circulating water pump in the system. When the water level reaches the normal operating level, take a water sample to measure the initial conductivity of the water sample in the system and record it as S0;

[0104] (3) Estimate the water volume V0 of the system, add industrial salt mg, circulate the system until the conductivity does not change, and measure the conductivity as S1; the material-liquid ratio of the amount of industrial salt added mg to the estimated water volume V0 of the system is 10g:1m 3 ;

[0105] (4) According to the formula V= , calculate the water volume V (unit: cubic meter).

[0106] The composite water treatment agent comprises, by weight, 2 parts of sodium molybdate, 1 part of methylbenzotriazole, 3 parts of tea polyphenols, 3 parts of dimethyldodecylbenzylammonium bromide, 8 parts of sodium lignin sulfonate, 7 parts of modified starch, and 76 parts of deionized water.

[0107] The preparation method of the modified starch is:

[0108] (11) Add 1 part by weight of starch to 6 parts by weight of the mixed acid solution, and stir at 400 rpm for 80 min to obtain a starch mixture;

[0109] (12) Add 2 parts by weight of phytic acid, 2 parts by weight of ammonium bicarbonate, and 0.4 parts by weight of silane coupling agent KH550 to 15.6 parts by weight of deionized water to prepare a modified solution;

[0110] (13) 1 part by weight of the modified solution was added dropwise to 5 parts by weight of the starch mixture, stirred at 400 rpm for 60 min, filtered, and dried to obtain modified starch.

[0111] The preparation method of the tea polyphenols is as follows:

[0112] (21) Grind fresh white tea leaves and pass them through a 100-mesh sieve to obtain white tea powder;

[0113] (22) dissolving white tea leaf powder in a mixed solution of anhydrous ethanol and ether, mixing uniformly, centrifuging at 5000 rpm for 10 min, and discarding the filtrate to obtain pretreated white tea leaf powder; the weight ratio of the camellia seed meal powder to the mixed solution is 1:4, and the weight ratio of anhydrous ethanol to ether in the mixed solution is 1:1;

[0114] (23) Add the pretreated white tea powder to deionized water, extract with 400W ultrasonic wave for 30 minutes, filter, and collect the filtrate; the weight ratio of the pretreated white tea powder to deionized water is 1:5;

[0115] (24) The pH of the filtrate was adjusted to 6.2, and the filtrate was loaded onto a HPD-600 macroporous adsorption resin column at a rate of 0.5 BV / h and an elution rate of 1 BV / h. 1 BV of the filtrate was washed with deionized water and 1 BV of the 40 wt% ethanol solution. The ethanol solution washings were collected and dried to obtain tea polyphenols.

[0116] The circulating cooling water system of a chemical plant has a relatively complex pipeline. The system has been in use for nearly 3 years (after comparison, the company determined that its actual water volume is 6800m 3 ), there are nearly 105 shell and tube and plate heat exchangers.

[0117] The water volume was tested using the method described in this example.

[0118] A preliminary estimate of the water volume was 6,000 to 6,800 cubic meters. Based on a 7,000 cubic meter volume, 70 kg of industrial salt was prepared. Before adding the industrial salt, the conductivity of the circulating cooling water was measured to be 225 μS / cm. With the fan turned off (no evaporation or concentration) and the circulating water pump running, industrial sodium chloride was dissolved in 50-liter open plastic buckets and added to the system. Conductivity was then measured every 30 minutes. After three hours, the conductivity stabilized and stopped rising, reaching 249 μM / cm.

[0119] According to the formula, V= = =6516m 3 ;Accuracy=6516 / 6800=95.82%.

[0120] Comparative Example 1

[0121] The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 uses an equal amount of modified starch to replace the tea polyphenols, and all other aspects are the same.

[0122] The circulating cooling water system of a chemical plant has a relatively complex pipeline. The system has been in use for nearly two and a half years (after comparison, the company determined that its actual water volume is 8500m 3 ), there are nearly 70 shell and tube and plate heat exchangers.

[0123] The water volume was tested using the method described in this comparative example.

[0124] A preliminary estimate of the water volume was 7,000 to 8,200 cubic meters. Based on 8,200 cubic meters, 82 kg of industrial salt was prepared. Before adding the industrial salt, the conductivity of the circulating cooling water was measured to be 216 μS / cm. With the fan turned off (no evaporation or concentration) and the circulating water pump running, industrial sodium chloride was dissolved in 50-liter open plastic buckets and added to the system. Conductivity was then measured every 30 minutes. After three hours, the conductivity stabilized and stopped rising, reaching 243 μM / cm.

[0125] According to the formula, V= = =6985m 3 ;Accuracy rate = 6985 / 8500 = 82.17%.

[0126] Comparative Example 2

[0127] The difference between Comparative Example 2 and Example 1 is that Comparative Example 2 uses an equal amount of tea polyphenols to replace the modified starch, and all other conditions are the same.

[0128] A circulating cooling water system in a chemical plant has a relatively complex pipeline. The system has been in use for nearly 3 years and 2 months (after comparison, the company determined that its actual water volume is 10740m3). 3 ), there are nearly 130 shell and tube and plate heat exchangers.

[0129] The water volume was tested using the method described in this comparative example.

[0130] A preliminary estimate of the water volume was 9,200 to 9,800 cubic meters. Based on 9,800 cubic meters, 98 kg of industrial salt was prepared. Before adding the industrial salt, the conductivity of the circulating cooling water was measured to be 224 μS / cm. With the fan turned off (no evaporation or concentration) and the circulating water pump running, industrial sodium chloride was dissolved in 50-liter open plastic buckets and added to the system. Conductivity was then measured every 30 minutes. After three hours, the conductivity stabilized and stopped rising, reaching 249 μM / cm.

[0131] According to the formula, V= = =9016m 3 ;Accuracy rate = 9016 / 10740 = 83.95%.

[0132] With the above-described preferred embodiments of the present invention as inspiration, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A method for measuring the water content of a circulating cooling water system, characterized in that: The following steps are involved: (1) The initial conductivity of the water sample in the measurement system is recorded as S0; (2) Estimate the water volume V0 of the system, add sodium chloride mg, circulate the system until the conductivity does not change, and measure the conductivity, which is recorded as S1; (3) According to the formula V= , calculate the water volume V; When the circulating cooling water system is an old system, the system is pretreated before step (1), wherein the pretreatment is to use a composite water treatment agent to pretreat the system; The composite water treatment agent comprises, by weight, 1-2 parts of sodium molybdate, 1-4 parts of methylbenzotriazole, 2-4 parts of tea polyphenols, 3-5 parts of dimethyldodecylbenzylammonium bromide, 4-8 parts of sodium lignin sulfonate, 5-9 parts of modified starch, and 65-80 parts of deionized water.

2. The method for measuring the water content of a circulating cooling water system according to claim 1, wherein: The step (1) is specifically as follows: Turn on the circulating water pump in the system. When the water level reaches the normal operating level, take a water sample to measure the initial conductivity of the water sample in the system and record it as S0.

3. The method for measuring the water content of a circulating cooling water system according to claim 1, wherein: The material-liquid ratio of the amount of sodium chloride added mg to the estimated water volume V0 of the system is 10g:1m 3 .

4. The method for measuring the water content of a circulating cooling water system according to claim 1, wherein: The sodium chloride is industrial salt.

5. The method for measuring the water content of a circulating cooling water system according to claim 1, wherein: The material-liquid ratio of the composite water treatment agent dosage to the estimated system water volume V0 is 2~6g:1m 3 .

6. The method for measuring the water content of a circulating cooling water system according to claim 1, wherein: The composite water treatment agent comprises, by weight, 1.2 to 2 parts of sodium molybdate, 1 to 3 parts of methylbenzotriazole, 2.5 to 4 parts of tea polyphenols, 3.2 to 5 parts of dimethyldodecylbenzylammonium bromide, 4 to 7 parts of sodium lignin sulfonate, 6 to 9 parts of modified starch, and 70 to 80 parts of deionized water.

7. The method for measuring the water content of a circulating cooling water system according to claim 5, wherein: The composite water treatment agent comprises, by weight, 1.6 parts of sodium molybdate, 2 parts of methylbenzotriazole, 3 parts of tea polyphenols, 4 parts of dimethyldodecylbenzylammonium bromide, 6 parts of sodium lignin sulfonate, 8 parts of modified starch, and 75.4 parts of deionized water.