Industrial boiler water quality bidirectional dynamic constant value rapid monitoring method

Abstract

The invention discloses an industrial boiler water quality bidirectional dynamic constant value rapid monitoring method, and belongs to the technical field of water quality analytical chemistry. According to the method, a water quality limit value-sample amount-reagent amount three-dimensional control detection method system is constructed, a unitized packaged solid reagent, a reference indicator card and a monitoring prompt card are matched, and rapid and accurate detection of hardness, alkalinity and chloride ion concentration in water samples such as industrial boiler water is realized through a two-step two-way dynamic detection process. According to the final color comparison of the reaction liquid, the numerical range of the water sample parameters is given, and the water quality monitoring of the industrial boiler is conveniently guided. The detection operation is rapid, the deviation of the result compared with the national standard method is less than or equal to 10%, the method is suitable for on-site rapid detection of hardness, alkalinity and chloride ion concentration, the detection prompt card also prompts an operator to carry out proper pollution discharge control, and the method is suitable for water quality dynamic regulation and control of an industrial boiler and a circulating water system.

Description

Technical Field

[0001] This invention belongs to the field of water quality analysis chemistry technology, specifically relating to a rapid two-way dynamic fixed-value monitoring method for industrial boiler water quality. Background Technology

[0002] The water quality indicators of industrial circulating cooling water and boiler water directly affect equipment corrosion and scaling control. GB50050-2007 "Design Code for Industrial Circulating Cooling Water Treatment" and GB / T1576 "Industrial Boiler Water Quality" explicitly list hardness, phenolphthalein alkalinity, total alkalinity, and chloride ions as mandatory testing items. Existing testing technologies, such as GB / T6909-2018 "Analytical Methods for Boiler Water and Cooling Water - Determination of Hardness", GB / T15451-2006 "Determination of Total Alkalinity and Phenolphthalein Alkalinity in Industrial Circulating Cooling Water", Appendix E of GB / T1576-2018 "Industrial Boiler Water Quality", and GB / T15453-2018 "Determination of Chloride Ions in Industrial Circulating Cooling Water and Boiler Water", have significant shortcomings in enterprise application.

[0003] 1. High personnel threshold: The existing testing method is a titration analysis method, which requires professional water quality testers. However, the survey shows that more than 50% of industrial boiler users in China do not have enough professional personnel. The existing operators have low technical level and it is difficult to complete the test according to the standard.

[0004] 2. Low detection efficiency: Conventional methods take more than 30 minutes to complete the detection of four indicators and require multiple samplings (each sample is only tested for 1-2 indicators).

[0005] 3. Difficulty in procuring reagents: In traditional testing, raw materials such as sulfuric acid as standard solutions are easily manufactured toxic or explosive chemicals, and procurement management is relatively strict. This makes procurement management inconvenient for many enterprises with industrial boilers and circulating cooling water.

[0006] 4. Poor quantitative accuracy: Existing rapid testing reagents on the market have metrological defects. Liquid reagents are measured in drops, and due to the quality of the dropper bottle and nozzle and operational reasons, problems such as continuous dripping and uneven drop volume are prone to occur, making precise control difficult; moreover, most test results require calculation, which is prone to errors by some operators. Solid reagents, on the other hand, need to meet the requirements of rapid and complete dissolution and accurate dosage, which also requires certain calculations.

[0007] 5. Limited application scenarios: Traditional standard testing requires a fixed laboratory environment and professional equipment, which cannot meet the needs of rapid on-site testing of boilers, and lacks clear guidance on sewage discharge, making it difficult to achieve dynamic water quality control.

[0008] Although some patents propose continuous potentiometric titration schemes (such as CN102590318B), they still rely on professional potentiometric titrators and dual-electrode systems, failing to solve the problem of operation adaptation for non-technical personnel. Spectrophotometric detectors (such as the supporting equipment for GB / T 45131-2025) have high accuracy, but the reagent costs are high and they require regular calibration. They also require a high level of technical expertise from operators, making it difficult to meet the needs of rapid and accurate on-site testing. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a rapid two-way dynamic fixed-value monitoring method for industrial boiler water quality. The method has simple operation steps, and the detection methods for various indicators are similar, requiring no professional calculation.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0011] A rapid two-way dynamic monitoring method for industrial boiler water quality is characterized by the following steps:

[0012] 1) Construct a three-dimensional detection system of "water quality limit - sample volume - reagent volume", with two levels for each dimension, covering key variables such as water quality standard threshold, sampling volume, and reagent volume. The two levels of sample volume and reagent volume are in a multiple relationship.

[0013] 2) Basic testing: Mix the reagent for determining the single water quality index with the single water sample, shake for 10-30 seconds and observe the color development. Combine the visual color scale to determine whether the water quality meets the lower limit requirement, or directly complete the standard determination of the single index.

[0014] 3) Dynamic adjustment detection: There are two adjustment methods, forward and reverse, to adapt to different judgment requirements. If the basic test meets the standard and a two-way qualified judgment is required, double the corresponding water quality index adjustment reagent is added to the same mixed solution for forward adjustment detection, and the water quality is judged according to the color development. The corresponding water quality index adjustment reagent can be doubled again to determine the degree of exceedance. If the basic test is qualified and the water sample safety margin needs to be verified, add an equal volume of water sample for reverse adjustment detection.

[0015] 4) Based on the color development results of steps 2) and 3), determine the duration and frequency of sewage discharge by referring to the accompanying sewage discharge guidance manual, thus forming a closed loop of "detection-judgment-control".

[0016] Furthermore, in step 2), the reagents for determining the water quality indicators are unit-packaged instant tablets or capsules, individually packaged, with each tablet / capsule precisely corresponding to the testing requirements of the water sample.

[0017] Furthermore, in step 2), the reagents for determining the water quality indicators are hardness testing reagents, alkalinity testing reagents, and chloride ion testing reagents.

[0018] Furthermore, the hardness testing reagent consists of Chrome Black T, disodium EDTA, pH adjuster, synergist, anti-caking agent, and stabilizer.

[0019] Furthermore, the alkalinity determination reagents are divided into phenolphthalein alkalinity reagent A, phenolphthalein alkalinity reagent B, and total alkalinity reagent C and total alkalinity reagent D; wherein, phenolphthalein alkalinity reagent A is composed of a solid strong acid reagent, an indicator, and an anti-caking agent; phenolphthalein alkalinity reagent B is composed of a solid strong acid reagent and an anti-caking agent; total alkalinity reagent C is composed of a solid strong acid reagent, an indicator, and an anti-caking agent; and total alkalinity reagent D is composed of a solid strong acid reagent and an anti-caking agent.

[0020] Furthermore, the chloride ion determination reagent is divided into a phenolphthalein alkalinity elimination reagent and a complexing reagent; wherein, the phenolphthalein alkalinity elimination reagent is composed of a solid strong acid reagent, an indicator and an anti-caking agent, and the complexing reagent is composed of a heavy metal salt and a filler.

[0021] Furthermore, in step 2), the mass-to-volume ratio of the reagent for determining water quality indicators to the water sample is 1 g: (100-200) mL.

[0022] Furthermore, in step 3), the judgment logic of the positive adjustment detection is as follows: if the color development meets the standard color mark after doubling the water quality indicator test reagent in the same mixed solution, the water quality is deemed qualified; if the color development does not meet the standard color mark, the water quality indicator test reagent is doubled again; if it does not meet the standard, the degree of exceeding the standard is determined as mild or severe based on the color.

[0023] Furthermore, in step 3), the judgment logic for reverse adjustment detection is as follows: for the unidirectional upper limit index, after the basic test is qualified, an additional water sample of the same volume is added, and the safety margin is determined by comparing the endpoint with T0 / 2.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] (1) Reduce reliance on personnel: The operation steps are simple, the detection methods for various indicators are similar, no professional calculation is required, and non-technical personnel can master it in 10 minutes, solving the problem of insufficient technical personnel in 50% of enterprises.

[0026] (2) Solving the reagent problem: Solid unitized reagents have no easily manufactured toxic components, and no special approval is required for procurement. The shelf life is up to 12 months (twice as long as liquid reagents).

[0027] (3) Improve quantitative accuracy: reagent error ≤5%, and the deviation of the test results from the GB / T1576 standard method is ≤10%, which meets the requirements for water quality control of industrial boilers.

[0028] (4) Achieve closed-loop control: The entire process from detection to sewage discharge guidance is visualized, avoiding the problem of "only detection without control", which can reduce boiler energy consumption and reduce the risk of scaling.

[0029] (5) Adaptable to field scenarios: No laboratory environment required, the total weight of reagents and sampling cups is ≤500g, which can be carried with you and meet the field testing needs of boiler workshops, field operations and other fields. Attached Figure Description

[0030] Figure 1 This is the overall flowchart of the method in this application;

[0031] Figure 2 This is a flowchart of the testing process for detecting the hardness of industrial boiler water in this application;

[0032] Figure 3 This is a process flow diagram for testing the alkalinity of phenolphthalein in industrial boiler water according to this application;

[0033] Figure 4 This is a process flow diagram for testing the total alkalinity of industrial boiler water in this application;

[0034] Figure 5 This is a process flow diagram for detecting chloride ions in industrial boiler water, as described in this application. Detailed Implementation

[0035] The present invention will be further illustrated below with reference to specific embodiments. These embodiments are implemented based on the technical solutions of the present invention, and it should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0036] The following examples were tested in accordance with GB / T6909-2018 "Analytical Methods for Boiler Water and Cooling Water - Determination of Hardness", GB / T15451-2006 "Determination of Total Alkalinity and Phenolphthalein Alkalinity in Industrial Circulating Cooling Water", Appendix E of GB / T1576-2018 "Industrial Boiler Water Quality", and GB / T15453-2018 "Determination of Chloride Ions in Industrial Circulating Cooling Water and Boiler Water".

[0037] A flowchart of a rapid two-way dynamic fixed-value monitoring method for industrial boiler water quality, as shown below. Figure 1 As shown, it includes the following steps:

[0038] 1) Construct a three-dimensional detection system of "water quality limit - sample volume - reagent volume", with two levels for each dimension, covering key variables such as water quality standard threshold, sampling volume, and reagent volume. The two levels of sample volume and reagent volume are in a multiple relationship.

[0039] 2) Basic testing: Mix the reagent for determining the single water quality index with the single water sample, shake for 10-30 seconds and observe the color development. Combine the visual color scale to determine whether the water quality meets the lower limit requirement, or directly complete the standard determination of the single index.

[0040] 3) Dynamic adjustment detection: There are two adjustment methods, forward and reverse, to adapt to different judgment requirements. If the basic test meets the standard and a two-way qualified judgment is required, double the corresponding water quality index adjustment reagent is added to the same mixed solution for forward adjustment detection, and the water quality is judged according to the color development. The corresponding water quality index adjustment reagent can be doubled again to determine the degree of exceedance. If the basic test is qualified and the water sample safety margin needs to be verified, add an equal volume of water sample for reverse adjustment detection.

[0041] 4) Based on the color development results of steps 2) and 3), determine the duration and frequency of sewage discharge by referring to the accompanying sewage discharge guidance manual, thus forming a closed loop of "detection-judgment-control".

[0042] Example 1

[0043] The preparation method of hardness testing reagent includes the following steps:

[0044] 1) Formula: 0.01 parts of Chrome Black T, 0.01 parts of disodium ethylenediaminetetraacetate, 1.8 parts of sodium hydroxide, 0.1 parts of magnesium disodium ethylenediaminetetraacetate, 6 parts of microcrystalline cellulose, and 1.3 parts of ascorbic acid.

[0045] 2) After mixing in proportion, grind evenly with a grinder at 2000 r / min at room temperature to obtain hardness testing powder; or quickly compress into tablets using conventional methods, 0.1 g / tablet; or fill into capsules using conventional methods to obtain capsule formulation, 0.1 g / capsule.

[0046] The preparation method of phenolphthalein alkalinity determination powder A includes the following steps:

[0047] 1) Formula: Sodium bisulfate 0.8g, phenolphthalein 0.05g, mannitol 8g.

[0048] 2) After mixing in proportion, grind evenly with a grinder at 2000 r / min at room temperature to obtain phenolphthalein alkalinity test powder A; it can also be compressed into tablets using conventional methods, 0.1 g / tablet; or it can be filled into capsules using conventional methods to obtain capsule formulations, 0.1 g / capsule.

[0049] The preparation method of phenolphthalein alkalinity determination powder B includes the following steps:

[0050] 1) Formula: Sodium bisulfate 2.4g, mannitol 7g.

[0051] 2) After mixing in proportion, grind evenly with a grinder at 2000 r / min at room temperature to obtain phenolphthalein alkalinity determination powder B; it can also be compressed into tablets using conventional methods, 0.1 g / tablet; or it can be filled into capsules using conventional methods to obtain capsule formulations, 0.1 g / capsule.

[0052] The preparation method of total alkalinity determination powder C includes the following steps:

[0053] 1) Formula: Sodium bisulfate 1.8g, methyl red 0.02g, methylene blue 0.03g, mannitol 7g.

[0054] 2) After mixing in proportion, grind evenly with a grinder at 2000 r / min at room temperature to obtain total alkalinity determination powder C; it can also be compressed into tablets using conventional methods, 0.1 g / tablet; or it can be filled into capsules using conventional methods to obtain capsule formulations, 0.1 g / capsule.

[0055] The preparation method of total alkalinity determination powder D includes the following steps:

[0056] 1) Formula: Sodium bisulfate 3.6g, mannitol 6g.

[0057] 2) After mixing in proportion, grind evenly with a grinder at 2000 r / min at room temperature to obtain total alkalinity determination powder D; it can also be compressed into tablets using conventional methods, 0.1 g / tablet; or it can be filled into capsules using conventional methods to obtain capsule formulations, 0.1 g / capsule.

[0058] Chloride ion determination reagent

[0059] The preparation method of phenolphthalein alkalinity elimination reagent E includes the following steps:

[0060] 1) Formula: Sodium bisulfate 1g, phenolphthalein 0.05g, potassium chromate 1.95g, mannitol 7g

[0061] 2) After mixing in proportion, grind evenly with a grinder at 2000 r / min at room temperature to obtain phenolphthalein alkalinity elimination reagent; tablets can also be obtained by conventional compression, 0.1 g / tablet; capsules can also be prepared by conventional filling, 0.1 g / capsule.

[0062] The preparation method of complexing reagent F includes the following steps:

[0063] 1) Formula: 2g silver salt, 8g mannitol.

[0064] 2) After mixing in proportion, grind evenly with a grinder at 2000 r / min at room temperature to obtain a complexing agent; it can also be compressed into tablets using conventional methods, 0.1 g / tablet; or it can be filled into capsules using conventional methods to obtain capsule formulations, 0.1 g / capsule.

[0065] Example 2

[0066] For testing the water hardness of a 10t / h steam boiler, this invention, based on the hardness index requirements of GB / T1576-2018 "Industrial Boiler Water Quality" standard, establishes three color-coded ranges for judgment: ≤0.03 mmol / L (blue), 0.03-0.06 (inclusive) mmol / L (purple), and >0.06 mmol / L (red). This invention strictly controls the hardness index compared to commercially available reagents. A purple color serves as a warning, requiring inspection of the water treatment equipment. See [link / reference]. Figure 2 Specifically, it includes the following steps:

[0067] (1) Basic test: Take a sample of boiler feedwater using a 20mL fixed-value sampling cup, pour it into an Erlenmeyer flask, add one grain of hardness test reagent, shake for 10-30 seconds and observe the color development. If it is pure blue, the water hardness is below the upper limit and meets the standard; if it is not blue, the water quality does not meet the standard, and water quality adjustment guidance is given, suggesting the source and cause of the water hardness exceeding the standard, such as resin failure and failure to regenerate in time, improper regeneration operation or abnormal equipment operating parameters.

[0068] (2) Dynamic adjustment test: Add 20mL of boiler feedwater to the conical flask that shows blue in (1) above, shake for 10~30 seconds and observe. If it still shows pure blue, the water quality is good and the water treatment equipment is normal; if it shows purple, it means that the water quality is close to the edge of being unqualified, and the monitoring frequency needs to be increased to pay attention to changes in feedwater quality and the status of water treatment equipment.

[0069] The hardness of three industrial boiler feedwater samples (standard hardness 0.02 mmol / L) was tested using the method of this invention and the standard method of GB / T6909-2018. Each sample was tested in parallel three times. The results are shown in Table 1 below.

[0070] Table 1 Results of water hardness measurement

[0071]

[0072] As shown in Table 1, the results of the standard method for testing the three samples were within the range of the results of the present invention, and the testing method of the present invention meets the requirements for hardness testing.

[0073] Example 3

[0074] For a natural circulation steam boiler with a rated steam pressure of 1.6 MPa, no superheater, and softened water as makeup water, the acceptable range for boiler water phenolphthalein alkalinity is 2.0-16.0 mmol / L, and the acceptable range for total alkalinity is 4.0-24.0 mmol / L. The boiler water testing procedures are as follows: Figure 3 , Figure 4 .

[0075] The phenolphthalein alkalinity determination includes the following steps:

[0076] 1) Basic test: Mix 1 tablet of phenolphthalein alkalinity reagent A with 20 mL of boiler feedwater sample, shake for 10-30 seconds and observe the color development. If no color develops, it means that the phenolphthalein alkalinity is <4 mmol / L; if it is red, it means that the phenolphthalein alkalinity is ≥4 mmol / L.

[0077] 2) Dynamic adjustment test: Add 20 mL of boiler water to the colorless conical flask in step 1), shake for 10-30 seconds and observe; if it is still colorless, it indicates that the phenolphthalein alkalinity of the boiler water is <2 mmol / L, and if it turns red, it indicates that the phenolphthalein alkalinity of the boiler water is 2-4 mmol / L; add one tablet of phenolphthalein alkalinity reagent B to the red conical flask in step 1). If it is colorless, it indicates that the phenolphthalein alkalinity of the boiler water is 4-16 mmol / L, and if it turns red, it indicates that the phenolphthalein alkalinity of the boiler water is >16 mmol / L, and it needs to be drained.

[0078] The total alkalinity test includes the following steps:

[0079] 1) Basic test: Mix 1 tablet of total alkalinity reagent C with 20 mL of boiler feedwater sample, shake for 10-30 seconds and observe the color development. If it turns reddish-purple, it means that the total alkalinity is <8 mmol / L; if it turns green, it means that the total alkalinity is ≥8 mmol / L.

[0080] 2) Dynamic adjustment test: Add 20 mL of boiler water to the conical flask that shows reddish-purple in step 1), shake for 10-30 seconds and observe; if it is still reddish-purple, it indicates that the total alkalinity of the boiler water is <4 mmol / L, and if it turns green, it indicates that the total alkalinity of the boiler water is 4-8 mmol / L; add a tablet of total alkalinity reagent D to the conical flask that shows green in step 1), if it turns reddish-purple, it indicates that the total alkalinity of the boiler water is 8-24 mmol / L, and if it turns green, it indicates that the total alkalinity of the boiler water is >24 mmol / L, then it needs to be drained.

[0081] The method of this invention was compared with the standard method in Appendix E of GB / T1576-2018 "Industrial Boiler Water Quality" to detect phenolphthalein alkalinity in four industrial boiler water samples. Each sample was tested in parallel three times. The results are shown in Table 2 below.

[0082] Table 2 Results of water quality phenolphthalein alkalinity determination

[0083]

[0084] As shown in Table 2, when the same sample was measured five times, the results of the standard method were within the range of the results of the present invention, and the detection method of the present invention meets the requirements for phenolphthalein alkalinity detection.

[0085] The method of this invention was compared with the standard method in Appendix E of GB / T1576-2018 "Industrial Boiler Water Quality" to detect the total alkalinity of four industrial boiler water samples. Each sample was tested in parallel three times. The results are shown in Table 3 below.

[0086] Table 3 Results of water quality total alkalinity determination

[0087]

[0088] As shown in Table 3, when the same sample was measured five times, the results of the standard method were within the range of the results of the present invention, and the detection method of the present invention meets the requirements for total alkalinity detection.

[0089] Example 4

[0090] Chloride ion detection was performed on water samples from a 10t / h steam boiler using the method of this invention and the standard method of GB / T15453-2018. Each group was tested in parallel five times. The results are shown in Table 4 below. (See Table 4 for details.) Figure 5 The specific steps include:

[0091] 1) Basic test: Mix 1-2 tablets of phenolphthalein alkalinity elimination reagent E with 10 mL of boiler feedwater sample until the solution turns yellow. Then add 1 tablet of complexing reagent F, shake for 10-30 seconds and observe the color development. If it turns brick red, it means chloride ion ≤ 400 mg / L; if it turns yellow, it means chloride ion > 400 mg / L.

[0092] 2) Dynamic adjustment detection: Add one tablet of complexing reagent F to the conical flask that shows yellow in step 1). If it turns brick red, it indicates that the chloride ion concentration of the boiler water is 400-800 mg / L. If it turns yellow, it indicates that the chloride ion concentration of the boiler water is >800 mg / L, and it needs to be discharged.

[0093] Table 4. Results of Chloride Ion Determination in Water

[0094]

[0095] As shown in Table 4, when the same sample was measured five times, the results of the standard method were within the range of the results of the present invention, and the detection method of the present invention meets the requirements for chloride ion detection.

[0096] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A rapid two-way dynamic fixed-value monitoring method for industrial boiler water quality, characterized in that, Includes the following steps: 1) Construct a three-dimensional detection system of "water quality limit - sample volume - reagent volume", with two levels for each dimension, covering key variables such as water quality standard threshold, sampling volume, and reagent volume. The two levels of sample volume and reagent volume are in a multiple relationship. 2) Basic testing: Mix the reagent for determining the single water quality index with the single water sample, shake for 10-30 seconds and observe the color development. Combine the visual color scale to determine whether the water quality meets the lower limit requirement, or directly complete the standard determination of the single index. 3) Dynamic adjustment detection: There are two adjustment methods, forward and reverse, to adapt to different judgment requirements. If the basic test meets the standard and a two-way qualified judgment is required, double the corresponding water quality index adjustment reagent is added to the same mixed solution for forward adjustment detection, and the water quality is judged according to the color development. The corresponding water quality index adjustment reagent can be doubled again to determine the degree of exceedance. If the basic test is qualified and the water sample safety margin needs to be verified, add an equal volume of water sample for reverse adjustment detection. 4) Based on the color development results of steps 2) and 3), determine the duration and frequency of sewage discharge by referring to the accompanying sewage discharge guidance manual, forming a closed loop of "detection-judgment-control".

2. The rapid monitoring method for two-way dynamic fixed-value monitoring of industrial boiler water quality according to claim 1, characterized in that: In step 2), the reagents for determining the water quality indicators are unit-packaged instant tablets or capsules, individually packaged, with each tablet / capsule precisely corresponding to the testing requirements of the water sample.

3. The rapid monitoring method for two-way dynamic fixed-value monitoring of industrial boiler water quality according to claim 1, characterized in that: In step 2), the reagents for determining the water quality indicators are hardness testing reagent, alkalinity testing reagent, and chloride ion testing reagent.

4. The rapid monitoring method for bidirectional dynamic fixed-value monitoring of industrial boiler water quality according to claim 3, characterized in that: The hardness test reagent consists of Chrome Black T, disodium EDTA, pH adjuster, synergist, anti-caking agent and stabilizer.

5. The rapid monitoring method for two-way dynamic fixed-value monitoring of industrial boiler water quality according to claim 3, characterized in that: The alkalinity determination reagents are divided into phenolphthalein alkalinity reagent A, phenolphthalein alkalinity reagent B, and total alkalinity reagent C and total alkalinity reagent D. Among them, phenolphthalein alkalinity reagent A consists of a solid strong acid reagent, an indicator, and an anti-caking agent; phenolphthalein alkalinity reagent B consists of a solid strong acid reagent and an anti-caking agent; total alkalinity reagent C consists of a solid strong acid reagent, an indicator, and an anti-caking agent; and total alkalinity reagent D consists of a solid strong acid reagent and an anti-caking agent.

6. The rapid monitoring method for bidirectional dynamic fixed-value monitoring of industrial boiler water quality according to claim 3, characterized in that: The chloride ion determination reagent is divided into a phenolphthalein alkalinity elimination reagent and a complexing reagent; the phenolphthalein alkalinity elimination reagent consists of a solid strong acid reagent, an indicator and an anti-caking agent, and the complexing reagent consists of a heavy metal salt and a filler.

7. The rapid monitoring method for bidirectional dynamic fixed-value monitoring of industrial boiler water quality according to claim 1, characterized in that: In step 2), the mass-to-volume ratio of the reagent for determining water quality indicators to the water sample is 1 g: (100-200) mL.

8. The rapid monitoring method for bidirectional dynamic fixed-value monitoring of industrial boiler water quality according to claim 1, characterized in that: In step 3), the judgment logic of the positive adjustment detection is as follows: if the color development meets the standard color mark after doubling the water quality indicator test reagent in the same mixed solution, the water quality is judged to be qualified; if the color development does not meet the standard color mark, the water quality indicator test reagent is doubled again; if it does not meet the standard, the degree of exceeding the standard is judged as mild or severe based on the color.

9. The rapid monitoring method for bidirectional dynamic fixed-value monitoring of industrial boiler water quality according to claim 1, characterized in that: In step 3), the judgment logic for reverse adjustment detection is as follows: for the unidirectional upper limit index, after the basic test is qualified, an additional water sample of the same volume is added, and the safety margin is determined by comparing the endpoint with T0 / 2.

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