Environmentally friendly boiler deoxidizer and preparation method thereof

Abstract

The present invention relates to the technical field of boiler deoxidizers, and in particular, to an environmentally friendly boiler deoxidizer and a preparation method thereof. The environmentally friendly boiler deoxidizer comprises 47 parts to 52 parts of tea polyphenols, 23 parts to 26 parts of tannic acid, 19 parts to 22 parts of a synergist, 340 parts to 360 parts of deionized water, 12 parts to 30 parts of potassium hydroxide solution, and 4.5 parts to 5.5 parts of sodium carboxymethyl cellulose. In the environmentally friendly boiler deoxidizer and a preparation method thereof, tea polyphenols and tannic acid react efficiently with dissolved oxygen in water by virtue of their strong antioxidant properties, and phytic acid, as a synergist, deeply combines with the two, thereby increasing the deoxidation rate, enhancing the adaptability to different water qualities, and maintaining stable deoxidation performance even in complex water qualities. In addition, sodium carboxymethyl cellulose, as a thickening stabilizer, prevents the precipitation and stratification of the deoxidizer system, thereby improving the stability of the deoxidizer and reducing the comprehensive performance of the environmentally friendly boiler deoxidizer.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler deoxidizers, in particular to an environmentally friendly boiler deoxidizer and a preparation method thereof. Background Art

[0002] During boiler operation, dissolved oxygen in water can cause severe oxidative corrosion of the boiler's metal components. This not only reduces the boiler's thermal efficiency and increases energy consumption, but also shortens the boiler's service life and can even lead to safety incidents, posing a threat to production and personnel safety. Therefore, removing dissolved oxygen from water is a key step in ensuring safe, stable, and efficient boiler operation.

[0003] To address the above issues, a variety of environmentally friendly boiler deoxidizers have been developed on the market. Existing environmentally friendly boiler deoxidizers can alleviate the problem of oxidative corrosion to a certain extent and are relatively environmentally friendly. However, there are still some problems in actual use. For example, an environmentally friendly boiler deoxidizer disclosed in Chinese Patent Publication No. CN111018028A;

[0004] Although this deoxygenator has certain deoxygenation capabilities and environmental protection characteristics, in actual applications, its deoxygenation speed is relatively slow, and it is difficult to quickly and effectively reduce the dissolved oxygen content in water in a short period of time, resulting in the inability to meet the needs in time under some working conditions with high requirements for deoxygenation efficiency, affecting the timeliness and efficiency of deoxygenation. Secondly, the deoxygenator has poor adaptability under different water quality conditions. When the impurity content in the water is high, the pH changes greatly, or the hardness is different, the active ingredients of the deoxygenator will be disturbed, resulting in a significant reduction in the deoxygenation effect of the deoxygenator, obvious fluctuations in the deoxygenation performance, and reduced stability of the deoxygenation effect. Therefore, not only the deoxygenation efficiency and deoxygenation stability are reduced, but also the applicability of the deoxygenator under different water quality environments is affected, thereby reducing the comprehensive performance of the environmentally friendly boiler deoxygenator.

[0005] In view of this, there is an urgent need for an environmentally friendly boiler deoxidizer and a preparation method thereof. Summary of the Invention

[0006] The object of the present invention is to provide an environmentally friendly boiler deoxidizer and a preparation method thereof to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides a method for preparing an environmentally friendly boiler deoxidizer, comprising the following steps:

[0008] S1. Raw materials: tea polyphenols, tannic acid, synergist, deionized water, potassium hydroxide solution and sodium carboxymethyl cellulose;

[0009] S2. Dissolving the thickening stabilizer: Pour deionized water into a stainless steel reactor equipped with a stirring device, turn on the stirrer and set the stirrer speed, then add sodium carboxymethyl cellulose and continue stirring until the sodium carboxymethyl cellulose is completely dissolved in the deionized water to form a uniform solution;

[0010] S3. Adding tea polyphenols and tannic acid: While stirring continuously, add tea polyphenols and tannic acid in sequence. After the addition is completed, continue stirring with the stirrer and adjust the stirrer speed to ensure that the tea polyphenols and tannic acid are fully dissolved and evenly dispersed in the solution;

[0011] S4. Adding a synergist: Add the synergist to the reactor and continue stirring with a stirrer to promote a secondary reaction between phytic acid, tea polyphenols, and tannic acid to form a more active composite system;

[0012] S5. Adjust the pH value: Use a high-precision pH meter to accurately measure the pH value of the solution, then add potassium hydroxide solution to adjust the pH value to 7.8-8.2;

[0013] S6. Mixing and filtration: After completing the pH adjustment, adjust the speed of the stirrer and continue to stir the solution to fully mix the components in the deoxidizer. Then, filter it using a filter membrane to obtain a stable liquid deoxidizer product.

[0014] As a further improvement of the present technical solution, in S1, the synergist is phytic acid, and the potassium hydroxide solution is a potassium hydroxide solution with a mass fraction of 10%.

[0015] As a further improvement of the present technical solution, in S2, the rotation speed of the stirrer is 280 r / min-320 r / min, and the continuous stirring time is 35 min-45 min.

[0016] As a further improvement of the present technical solution, in S3, the method of adding tea polyphenols and tannic acid is to add them in small amounts and multiple times, adding 1-2 parts each time, and adding 1 part every 0.4-0.8 minutes on average.

[0017] As a further improvement of the present technical solution, in S3, the stirrer continues stirring for 60 min-70 min, and the speed of the stirrer is adjusted to 340 r / min-360 r / min.

[0018] As a further improvement of the present technical solution, in S4, the stirrer continues stirring for 45 minutes to 55 minutes.

[0019] As a further improvement of the present technical solution, in S5, the potassium hydroxide solution is added in small amounts and multiple times, 1-2 parts each time, stirred for 1.5 minutes to 2 minutes, and then the pH value is measured.

[0020] As a further improvement of the present technical solution, in S6, the rotation speed of the stirrer is 280 r / min-320 r / min, and the stirring time is continued for 40 min-50 min.

[0021] As a further improvement of the present technical solution, in S6, the filter membrane adopts a 0.02 μm microporous filter membrane.

[0022] In another aspect, the present invention provides an environmentally friendly boiler deoxidizer comprising the following raw materials:

[0023] The dosage of tea polyphenols is 47-52 parts;

[0024] The dosage of tannic acid is 23-26 parts;

[0025] The dosage of the synergist is 19-22 parts;

[0026] The amount of deionized water used is 340-360 parts;

[0027] The dosage of potassium hydroxide solution is 12 parts to 30 parts;

[0028] The dosage of sodium carboxymethyl cellulose is 4.5 parts to 5.5 parts.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] In the environmentally friendly boiler deoxidizer and preparation method thereof, tea polyphenols and tannic acid react efficiently with dissolved oxygen in water by virtue of their strong antioxidant properties, and phytic acid, as a synergist, deeply combines with the two for a second time, thereby increasing the deoxidation rate and being able to quickly reduce the dissolved oxygen content in water in a short period of time. At the same time, the adaptability to different water qualities is enhanced, and stable deoxidation performance can be maintained even in complex water qualities. In addition, sodium carboxymethyl cellulose is used as a thickening stabilizer to prevent precipitation and stratification of the deoxidizer system, thereby improving the stability of the deoxidizer. In addition, natural or environmentally friendly raw materials of tea polyphenols and tannic acid are selected, which, while achieving efficient deoxidation, reduces pollution to the environment, thereby reducing the overall performance of the environmentally friendly boiler deoxidizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a flow chart of the method for preparing the environmentally friendly boiler deoxidizer of the present invention;

[0032] Figure 2 This is a histogram of the deoxidation rate of the present invention;

[0033] Figure 3This is a histogram of the storage stability of the present invention. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] An embodiment of the present invention provides an environmentally friendly boiler deoxidizer, comprising the following raw materials:

[0036] The dosage of tea polyphenols is 47-52 parts (parts by mass). Tea polyphenols have strong antioxidant properties and can react with dissolved oxygen in water to achieve the effect of deoxygenation.

[0037] The dosage of tannic acid is 23-26 parts by mass, which works synergistically with tea polyphenols and utilizes its own antioxidant properties to further enhance the oxygen scavenging ability of the oxygen scavenger;

[0038] The dosage of the synergist is 19-22 parts (mass parts);

[0039] The amount of deionized water used is 340-360 parts (mass parts). Deionized water is used as a solvent to fully dissolve and evenly disperse the ingredients.

[0040] The amount of potassium hydroxide solution used is 12-30 parts (parts by mass);

[0041] The dosage of sodium carboxymethyl cellulose is 4.5-5.5 parts (parts by mass). Sodium carboxymethyl cellulose acts as a thickening stabilizer to make the deoxidizer system more stable and prevent precipitation and stratification.

[0042] according to Figure 1 As shown, an embodiment of the present invention also provides a preparation method for the above-mentioned environmentally friendly boiler deoxidizer, comprising the following steps:

[0043] Step 1. Raw materials: tea polyphenols, tannic acid, synergist, deionized water, potassium hydroxide solution (analytical grade, analytical grade is a purity specification of chemical reagents, analytical grade reagents have lower impurity content and higher purity), and sodium carboxymethyl cellulose; wherein, the synergist is phytic acid (chemical name: inositol hexaphosphate), which can deeply combine with tea polyphenols and tannic acid to significantly improve the deoxygenation speed of the scavenger, its adaptability to different water qualities, and its stability; the potassium hydroxide solution uses a potassium hydroxide solution with a mass fraction of 10%;

[0044] Step 2: Dissolve the thickening stabilizer: Pour deionized water into a stainless steel reactor equipped with a stirring device, turn on the stirrer, and set the stirrer speed to 280r / min-320r / min, then add sodium carboxymethyl cellulose and continue stirring for 35min-45min until the sodium carboxymethyl cellulose is completely dissolved in the deionized water to form a uniform solution;

[0045] Step 3, adding tea polyphenols and tannic acid: under continuous stirring, add tea polyphenols and tannic acid in sequence. The method of adding tea polyphenols and tannic acid is to add 1-2 parts (by mass) each time, and add 1 part every 0.4min-0.8min on average to avoid agglomeration. After the addition is completed, continue stirring with the stirrer for 60min-70min and adjust the stirrer speed to 340r / min-360r / min to fully dissolve the tea polyphenols and tannic acid and evenly disperse them in the solution.

[0046] Step 4: Adding synergist: Add synergist to the reactor and continue stirring for 45-55 minutes using a stirrer to promote a secondary reaction between phytic acid, tea polyphenols and tannic acid to form a more active composite system.

[0047] Step 5. Adjust the pH value: Use a high-precision pH meter to accurately measure the pH value of the solution, then add potassium hydroxide solution to adjust the pH value. Add potassium hydroxide solution in small amounts and multiple times, adding 1-2 parts each time, stirring for 1.5-2 minutes, and then measuring the pH value. Adjust the pH value to 7.8-8.2. During the adjustment process, continue to stir the solution to mix evenly, and pay close attention to the changes in the pH value to prevent over-adjustment.

[0048] Step 6. Mixing and filtration: After completing the pH adjustment, adjust the speed of the stirrer to 280r / min-320r / min, continue to stir the solution, and continue stirring for 40min-50min to fully mix the various components in the deoxidizer. After that, filter it with a 0.02μm microporous filter membrane to remove possible impurities and undissolved particles to obtain a stable liquid deoxidizer product.

[0049] In the invention, firstly, by selecting a variety of raw materials including tea polyphenols, tannic acid, phytic acid (synergist), deionized water, potassium hydroxide solution and sodium carboxymethyl cellulose, not only can the strong antioxidant properties of tea polyphenols and tannic acid react with dissolved oxygen in water to increase the efficient deoxygenation effect, but at the same time, phytic acid as a synergist can deeply combine with tea polyphenols and tannic acid for a secondary combination; for example, under complex working conditions such as water with many impurities, large changes in pH or different hardness, the deoxygenation speed can be effectively improved, and the dissolved oxygen content in water can be quickly reduced in a short time to achieve working conditions with high deoxygenation efficiency; the adaptability to different water qualities is improved, so that the deoxygenator can still maintain stable deoxygenation performance in complex water qualities; the stability of the deoxygenator is improved, the loss of the effective ingredients of the deoxygenator during storage is reduced, and the service life is increased; and sodium carboxymethyl cellulose is used as a thickening stabilizer to effectively prevent precipitation and stratification in the deoxygenator system.

[0050] In the preparation method of the environmentally friendly boiler deoxidizer, not only can tea polyphenols and tannic acid be combined for a second time, but phytic acid as a synergist can also be deeply combined for a second time with tea polyphenols and tannic acid, wherein:

[0051] The secondary combination of tea polyphenols and tannic acid has the effect that the synergistic effect of the two further enhances the oxygen scavenging ability of the oxygen scavenger and increases the oxygen scavenging effect. Through the superposition of each other's antioxidant properties, they can react with dissolved oxygen in water more efficiently. The reaction mechanism is that the multiple phenolic hydroxyl groups contained in the tea polyphenol molecules and the corresponding active sites in the tannic acid molecules can form hydrogen bond interactions, which makes them combine together and enhance the electron cloud density, which is more conducive to the capture and reaction of oxygen molecules. In principle, it can be schematically represented as follows: tea polyphenols ( , The main structure of tea polyphenols) and tannic acid ( , The main structure of tannic acid) is combined by hydrogen bonds, such as (n, m, are the number of molecules involved in the reaction, and the reaction is reversible);

[0052] After phytic acid is used as a synergist and deeply combined with tea polyphenols and tannic acid for the second time, it can improve the deoxygenation speed of the deoxygenator, so that it can quickly reduce the dissolved oxygen content in the water in a short time, and at the same time enhance its adaptability to different water qualities. Even in complex water qualities with many impurities, large changes in pH or different hardness, it can maintain stable deoxygenation performance, and also improve the stability of the deoxygenator, reducing the loss of effective ingredients during storage; the reaction mechanism is that the multiple phosphate groups in the phytic acid molecule have strong nucleophilicity, which will hydrogen bond and coordinate with the active groups such as hydroxyl and phenolic hydroxyl in the tea polyphenols and tannic acid molecules to form a stable complex. The complex has more active sites and is easier to undergo redox reaction with dissolved oxygen in water; the chemical reaction formula is as follows: Phytic acid (with Indicates that IP is phytate ion) and tea polyphenols ( ), tannic acid ( )reaction, (X is the number of hydrogen ions released in the reaction, n and m are the number of tea polyphenols and tannic acid molecules participating in the reaction, and the reaction is reversible). The formed complex system then undergoes a deoxygenation reaction with oxygen. like products, thereby effectively achieving the purpose of deoxidation and improving the comprehensive performance of the deoxidizer.

[0053] Tea polyphenols and tannic acid react efficiently with dissolved oxygen in water by virtue of their strong antioxidant properties. Phytic acid, as a synergist, deeply combines with the two to increase the deoxygenation rate, which can quickly reduce the dissolved oxygen content in water in a short period of time. At the same time, it enhances the adaptability to different water qualities and can maintain stable deoxygenation performance even in complex water qualities. In addition, sodium carboxymethyl cellulose is used as a thickening stabilizer to prevent precipitation and stratification of the deoxygenator system, thereby improving the stability of the deoxygenator. In addition, the selection of natural or environmentally friendly raw materials for tea polyphenols and tannic acid can achieve efficient deoxygenation while reducing pollution to the environment, thereby reducing the overall performance of the environmentally friendly boiler deoxygenator.

[0054] The environmentally friendly boiler deoxidizer provided by the present invention is further described through the following specific examples according to different raw material dosages. Example 1

[0055] Raw material dosage: 48 parts of tea polyphenols, 24 parts of tannic acid, 20 parts of phytic acid (synergist), 345 parts of deionized water, 15 parts of potassium hydroxide solution (mass fraction 10%), 4.6 parts of sodium carboxymethyl cellulose;

[0056] Preparation method: pour deionized water into a stainless steel reactor, turn on the stirrer, set the speed to 290 r / min, add sodium carboxymethyl cellulose, and stir for 38 minutes to completely dissolve it; add tea polyphenols and tannic acid in small amounts and multiple times, add 1 part each time, and add 1 part every 0.5 minutes on average. After the addition, adjust the stirrer speed to 345 r / min and continue stirring for 62 minutes; add phytic acid and stir for 48 minutes; measure the pH value with a high-precision pH meter, add potassium hydroxide solution in small amounts and multiple times, 1 part each time, stir for 1.6 minutes, then measure the pH value and adjust it to 7.9; adjust the stirrer speed to 290 r / min, continue stirring for 42 minutes, and then filter with a 0.02 μm microporous filter membrane to obtain a liquid deoxidizer product. Example 2

[0057] Raw material dosage: 51 parts of tea polyphenols, 25 parts of tannic acid, 19 parts of phytic acid (synergist), 355 parts of deionized water, 25 parts of potassium hydroxide solution (mass fraction 10%), 5.2 parts of sodium carboxymethyl cellulose;

[0058] Preparation method: pour deionized water into a reactor, set the stirrer speed to 310 r / min, add sodium carboxymethyl cellulose, and stir for 42 minutes to dissolve it; add 2 parts of tea polyphenols and tannic acid each time, and add 1 part every 0.7 minutes on average. After the addition, adjust the stirrer speed to 355 r / min and continue stirring for 68 minutes; add phytic acid and stir for 52 minutes; measure the pH value, add 2 parts of potassium hydroxide solution each time, stir for 1.9 minutes, then measure the pH value and adjust it to 8.1; adjust the stirrer speed to 310 r / min, continue stirring for 48 minutes, and then filter with a 0.02 μm microporous filter membrane to obtain a liquid deoxidizer product. Example 3

[0059] Raw material dosage: 50 parts of tea polyphenols, 23 parts of tannic acid, 22 parts of phytic acid (synergist), 350 parts of deionized water, 22 parts of potassium hydroxide solution (mass fraction 10%), 5 parts of sodium carboxymethyl cellulose;

[0060] Preparation method: pour deionized water into a reactor, set the stirrer speed to 300 r / min, add sodium carboxymethyl cellulose, and stir for 40 minutes to dissolve it; add 1.5 parts of tea polyphenols and tannic acid each time, and add 1 part every 0.6 minutes on average. After the addition, adjust the stirrer speed to 350 r / min and continue stirring for 65 minutes; add phytic acid and stir for 50 minutes; measure the pH value, add 1.5 parts of potassium hydroxide solution each time, stir for 1.8 minutes, then measure the pH value and adjust it to 8.0; adjust the stirrer speed to 300 r / min, continue stirring for 45 minutes, and then filter with a 0.02 μm microporous filter membrane to obtain a liquid deoxidizer product.

[0061] In order to verify that the environmentally friendly boiler deoxidizer prepared in the embodiment of the present invention has good deoxidation performance and stability, the environmentally friendly boiler deoxidizer provided in the embodiment of the present invention is described through the following test examples.

[0062] Test example

[0063] The purpose of this test group is to explore the effects of different component ratios on the environmentally friendly boiler deoxidizer, and to detect the deoxidation speed, deoxidation stability, storage stability and adaptability to different water qualities of the environmentally friendly boiler deoxidizer of the present invention.

[0064] Test objectives: Test groups A, B, and C respectively use the composition ratios of the environmentally friendly boiler deoxidizers provided in Examples 1-3; the control examples use control groups A, B, and C, where:

[0065] Control group A

[0066] Oxygen scavenger formula: 40 parts by mass of ascorbic acid, 20 parts by mass of sodium gluconate, 400 parts by mass of deionized water, and 10 parts by mass of other additives;

[0067] Preparation method: add deionized water into a reaction container, turn on the stirrer, add ascorbic acid, sodium gluconate and other additives in sequence, stir evenly to obtain the deoxidizer product.

[0068] Control group B

[0069] Deoxidizer formula: 30 parts by mass of sodium sulfite, 15 parts by mass of disodium edetate, 380 parts by mass of deionized water, and 5 parts by mass of stabilizer;

[0070] Preparation method: Pour deionized water into a reactor, turn on the stirrer, first add sodium sulfite and stir until dissolved, then add disodium ethylenediaminetetraacetic acid and stabilizer, continue stirring until uniform, and obtain the deoxidizer product.

[0071] Control group C

[0072] The amount of raw materials used was the same as in Example 1, but phytic acid (synergist) was not added;

[0073] Preparation method: the same as Example 1, but excluding the step of adding phytic acid.

[0074] Test method: According to the environmentally friendly boiler deoxidizer of the present invention, the deoxidation speed, deoxidation stability, storage stability and adaptability to different water qualities are tested respectively. The specific test methods are as follows:

[0075] Deoxygenation rate test method: prepare multiple clean reaction containers of the same specifications, measure 500 mL of simulated boiler water with an initial dissolved oxygen content of approximately 8 mg / L and pour it into each reaction container, add 10 g of different deoxygenators to each reaction container (test groups A, B, and C correspond to the deoxygenators of Examples 1, 2, and 3, respectively, and control groups A, B, and C correspond to the above three control deoxygenators, respectively), immediately start the stirring device, set the stirring speed to a constant 300 r / min, use a dissolved oxygen meter, measure the dissolved oxygen content in the water every 3 minutes, and record in detail the time from the addition of the deoxygenator to the time the dissolved oxygen content in the water drops below 0.1 mg / L. This time is used as an indicator to measure the deoxygenation rate. The shorter the time, the faster the deoxygenation rate.

[0076] Deoxygenation stability test method: prepare 15 portions of simulated boiler water with a volume of 500 mL and an initial dissolved oxygen content of approximately 8 mg / L, and divide them into three groups, each with 5 portions; add the corresponding group of deoxygenators (the addition amount is 10 g) to the test group A (corresponding to the deoxygenator in Example 1), the control group A, and the other two groups respectively; carry out the deoxygenation reaction under the conditions of a constant temperature of 25°C and a stirring speed of 300 r / min; after the reaction is carried out for 30 minutes, quickly measure the dissolved oxygen content of 5 water samples in each group; calculate the average and standard deviation of the dissolved oxygen content of the 5 water samples in each group, the average value reflects the average dissolved oxygen level of the group after deoxygenation, and the standard deviation reflects the degree of dispersion of the data. The smaller the standard deviation, the better the deoxygenation stability.

[0077] Storage stability test method: The prepared deoxidizers (test groups A, B, C and control groups A, B, C) were respectively placed in several well-sealed containers and stored in a stable environment with a temperature of 20°C and a relative humidity of 60%; from the start of storage, a deoxidizer sample was taken out every month, and the deoxidation rate of the sample was measured according to the operation in the deoxidation rate test method; the retention rate of the deoxidation rate measured this time relative to the deoxidation rate when it was just prepared (initial state) was calculated (retention rate = deoxidation rate during measurement / initial deoxidation rate × 100%), and the storage stability of the deoxidizer was evaluated by the retention rate. The higher the retention rate, the better the storage stability.

[0078] Adaptability testing for different water qualities involved preparing simulated boiler water of three different qualities: high-hardness water (total calcium and magnesium ion concentration precisely adjusted to 500 mg / L, measured and adjusted using a professional water quality analyzer); high-pH water (pH accurately adjusted to 10, measured and adjusted using a high-precision pH meter); and high-impurity water (water with a certain amount of sediment and rust added and thoroughly stirred to ensure even dispersion of the impurities). 500 mL water samples were prepared for each water quality. 10 g of different deoxidizers were added to each simulated boiler water (experimental groups A, B, and C, and control groups A, B, and C). Deoxidation reactions were carried out under identical conditions: a temperature of 25°C ± 1°C and a stirring speed of 300 rpm. After 30 minutes of reaction, the dissolved oxygen content of each water sample in each water quality was accurately measured, and the deoxygenation effects of different deoxygenators under different water qualities were compared. The lower the dissolved oxygen content, the better the adaptability of the deoxygenator to this water quality, so as to evaluate the adaptability of the deoxygenator to different water qualities.

[0079] The summary is as follows:

[0080] In terms of deoxygenation speed: the deoxygenation speed of the experimental groups A, B, and C is significantly faster than that of the control groups A, B, and C. Figure 2 As shown in the figure, the deoxygenation time of the test group A was 17 minutes, the test group B was 14 minutes, and the test group C was 16 minutes, while the control group A took 37 minutes, the control group B took 30 minutes, and the control group C took 34 minutes. This shows that the environmentally friendly boiler deoxygenator prepared by the present invention (containing tea polyphenols, tannic acid, phytic acid and other ingredients) can reduce the dissolved oxygen content in water more quickly. Phytic acid, as a synergist, deeply combines with tea polyphenols and tannic acid for a second time, thereby improving the deoxygenation speed. Compared with other deoxygenator formulas (such as control groups A and B) and the formula lacking phytic acid (control group C), it has obvious effects.

[0081] In terms of deoxygenation stability: the deoxygenation stability of the experimental groups A, B, and C (measured by the standard deviation of dissolved oxygen content) is much better than that of the control groups A, B, and C. Figure 3 As shown in the figure, the average dissolved oxygen content of the test group A after deoxygenation was 0.42 mg / L, with a standard deviation of ±0.02; the average dissolved oxygen content of the test group B was 0.38 mg / L, with a standard deviation of ±0.01; the average dissolved oxygen content of the test group C was 0.40 mg / L, with a standard deviation of ±0.03; while the average dissolved oxygen content of the control group A was 1.6 mg / L, with a standard deviation of ±0.18; the average dissolved oxygen content of the control group B was 1.1 mg / L, with a standard deviation of ±0.13; and the average dissolved oxygen content of the control group C was 1.3 mg / L, with a standard deviation of ±0.15. This shows that the oxygen scavenger of the present invention can maintain a more stable deoxygenation effect during the deoxygenation process and is less affected by fluctuations in water quality factors. This is mainly due to the synergistic effect between the components, especially the combination of phytic acid with tea polyphenols and tannic acid, which enhances the activity and stability of the oxygen scavenger.

[0082] In terms of storage stability: the storage stability of the test groups A, B, and C is significantly higher than that of the control groups A, B, and C; the storage stability retention rate of the test group A is 90%, the test group B is 92%, and the test group C is 91%, while the control group A is 65%, the control group B is 75%, and the control group C is 72%; this shows that the oxygen scavenger of the present invention has less loss of effective ingredients during storage and has high storage stability. The presence of phytic acid effectively protects tea polyphenols and tannic acid from oxidation or decomposition, extends the service life of the oxygen scavenger, and is conducive to long-term storage and use.

[0083] In terms of adaptability to different water qualities: under three different water quality conditions of high hardness water, high pH water and high impurity water, the deoxygenation effects of test groups A, B and C are better than those of control groups A, B and C; for example, in high hardness water, the dissolved oxygen content of test group A after treatment is 1.65 mg / L, test group B is 1.6 mg / L, and test group C is 1.62 mg / L, while control group A is 2.0 mg / L, control group B is 1.5 mg / L, and control group C is 1.7 mg / L; similar situations are also shown in high pH water and high impurity water; this shows that the deoxygenator of the present invention has better adaptability to different water qualities and can maintain good deoxygenation performance in complex water quality environments. The combination of phytic acid, tea polyphenols and tannic acid enhances the resistance of the deoxygenator to water quality changes.

[0084] It can be seen that the optimal ratio is the ratio of Example 2, namely 51 parts of tea polyphenols, 25 parts of tannic acid, 19 parts of phytic acid (synergist), 355 parts of deionized water, 25 parts of potassium hydroxide solution (mass fraction 10%), and 5.2 parts of sodium carboxymethyl cellulose; not only does it perform best in deoxygenation speed, it only takes 14 minutes to reduce the dissolved oxygen content in water to below 0.1 mg / L. The average dissolved oxygen content after deoxygenation is 0.38 mg / L and the standard deviation is ±0.01. The deoxygenation stability is the best, and the storage stability retention rate is as high as 92%. In terms of adaptability to different water qualities (high hardness water, high pH water, high impurity water), the dissolved oxygen content after treatment is relatively lower, thereby improving the comprehensive performance of the environmentally friendly boiler deoxidizer.

[0085] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing an environmentally friendly boiler deoxidizer, characterized in that: The following steps are involved: S1. Raw materials: tea polyphenols, tannic acid, synergist, deionized water, potassium hydroxide solution and sodium carboxymethyl cellulose. The synergist is phytic acid. S2. Dissolving the thickening stabilizer: Pour deionized water into a stainless steel reactor equipped with a stirring device, turn on the stirrer and set the stirrer speed, then add sodium carboxymethyl cellulose and continue stirring until the sodium carboxymethyl cellulose is completely dissolved in the deionized water to form a uniform solution; S3. Adding tea polyphenols and tannic acid: While stirring continuously, add tea polyphenols and tannic acid in sequence. After the addition is completed, continue stirring with the stirrer and adjust the stirrer speed to ensure that the tea polyphenols and tannic acid are fully dissolved and evenly dispersed in the solution; S4. Adding a synergist: Add the synergist to the reactor and continue stirring with a stirrer to promote a secondary reaction between phytic acid, tea polyphenols, and tannic acid to form a more active composite system; S5. Adjust the pH value: Use a high-precision pH meter to accurately measure the pH value of the solution, then add potassium hydroxide solution to adjust the pH value to 7.8-8.2; S6. Mixing and filtration: After completing the pH adjustment, adjust the speed of the stirrer and continue to stir the solution to fully mix the components in the deoxidizer. Then, filter it using a filter membrane to obtain a stable liquid deoxidizer product.

2. The preparation method of the environmentally friendly boiler deoxidizer according to claim 1, characterized in that: In S1, the potassium hydroxide solution uses a potassium hydroxide solution with a mass fraction of 10%.

3. The preparation method of the environmentally friendly boiler deoxidizer according to claim 1, characterized in that: In S2, the rotation speed of the stirrer is 280 r / min-320 r / min, and the continuous stirring time is 35 min-45 min.

4. The preparation method of the environmentally friendly boiler deoxidizer according to claim 1, characterized in that: In said S3, the method of adding tea polyphenols and tannic acid is to add them in small amounts and multiple times, adding 1-2 parts each time, and adding 1 part every 0.4-0.8 minutes on average.

5. The preparation method of the environmentally friendly boiler deoxidizer according to claim 1, characterized in that: In S3, the stirrer continues stirring for 60 min-70 min, and the speed of the stirrer is adjusted to 340 r / min-360 r / min.

6. The method for preparing an environmentally friendly boiler deoxidizer according to claim 1, wherein: In S4, the stirrer continues stirring for 45 min to 55 min.

7. The method for preparing an environmentally friendly boiler deoxidizer according to claim 1, wherein: In S5, the potassium hydroxide solution is added in small amounts and multiple times, 1-2 parts each time, stirred for 1.5 minutes to 2 minutes, and then the pH value is measured.

8. The method for preparing an environmentally friendly boiler deoxidizer according to claim 1, wherein: In S6, the rotation speed of the stirrer is 280 r / min-320 r / min, and the stirring time is continued for 40 min-50 min.

9. The method for preparing an environmentally friendly boiler deoxidizer according to claim 1, wherein: In the above-mentioned S6, the filter membrane adopts a 0.02 μm microporous filter membrane.

10. An environmentally friendly boiler deoxidizer prepared by the preparation method of the environmentally friendly boiler deoxidizer according to any one of claims 1 to 9, characterized in that: Including the following ingredients: The dosage of tea polyphenols is 47-52 parts; The dosage of tannic acid is 23-26 parts; The dosage of the synergist is 19-22 parts; The amount of deionized water used is 340-360 parts; The dosage of potassium hydroxide solution is 12 parts to 30 parts; The dosage of sodium carboxymethyl cellulose is 4.5 parts to 5.5 parts.

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