Multi-effect furnace water treatment agent

Abstract

The invention provides a multi-effect boiler water treatment agent, and relates to the technical field of boiler scale treatment. The multi-effect furnace water treatment agent is prepared from, by mass, 55%-65% of sodium carbonate, 13%-20% of sodium humate, 6%-9% of hydroxyethylidene diphosphonic acid, 4%-7% of sodium polyacrylate, 6%-10% of sodium dihydrogen phosphate and 3%-6% of ethylenediamine tetramethylene phosphoric acid, and the sum of all the components is 100%. By introducing 2-5% of organic phosphonic carboxylic acid, POCA has excellent chelating performance, can form a stable complex with metal ions such as calcium and magnesium, enhances the anti-scaling effect, and especially has an obvious inhibiting effect on insoluble scale. Meanwhile, the additive is stable at high temperature, can adapt to the complex operation environment of the boiler, and cooperates with other components to improve the overall performance.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler scale treatment, and specifically provides a multi-effect boiler water treatment agent. Background Art

[0002] In industrial production, boilers, as key equipment, their operation safety and stability are of crucial importance. With the rapid development of industry, the requirements for boiler performance and operation efficiency are constantly increasing, and the treatment effect of boiler water directly affects the operation status of boilers. Traditional boiler water treatment methods and agents have many defects. Taking widely used trisodium phosphate as an example, according to the current boiler operation standard GB / T12145-2008, although it can reduce boiler scaling to a certain extent, due to its own dissolution characteristics, obvious problems occur when the water temperature changes. At 0-100°C, the solubility of trisodium phosphate gradually increases, and it maintains a relatively high solubility at 150°C. However, when the water temperature continues to rise, its solubility drops sharply, showing a "temporary disappearance" phenomenon. This will cause trisodium phosphate to precipitate and crystallize on the inner wall of the pipe wall, not only making the heat transfer performance of the pipe poor, leading to damage and leakage of the pipe wall, but also reacting with the iron precipitate on the pipe wall to form insoluble scale, accelerating the scaling and corrosion of the pipe wall. At the same time, its precipitation will produce free NaOH in the near-wall layer of the pipe wall, causing alkaline corrosion, seriously threatening the safe operation of the boiler. Once leakage occurs, it will cause production stoppage losses and waste of a large amount of manpower, material resources and financial resources.

[0003] In addition, some common boiler descaling agents, such as the boiler descaling agent disclosed in the publication number CN102923867A, although they can play a certain descaling role after the boiler is scaled, they cannot meet the requirements of continuously adjusting the water quality, preventing scaling and corrosion during the operation of the boiler. Such descaling agents are usually used after scaling, and the proportion of some components is unreasonable, such as the content of sodium polyacrylate and hydroxyethylidene diphosphonic acid sodium is too high. If used as a running water coordination treatment agent for a long time, it will affect the service life of the boiler. Moreover, there is a lack of products in the existing technology that can effectively prevent scaling and residual oxygen corrosion in medium and high-pressure boiler water, form a protective film at the same time, and ensure the normal operation of the boiler. Therefore, it is extremely urgent to develop a multi-effect boiler water treatment agent with excellent performance and capable of solving the above-mentioned problems. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the existing technology, the present invention provides a multi-effect boiler water treatment agent, which solves the problems of "temporary disappearance" of traditional agents, weak scale prevention and corrosion resistance, and lack of comprehensive excellent products.

[0006] (2) Technical Solutions

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A multi-effect furnace water treatment agent, the raw materials of the multi-effect furnace water treatment agent are composed of the following mass percentages:

[0008] Sodium carbonate 55 - 65%

[0009] Sodium humate 13 - 20%

[0010] Hydroxyethylethylenediphosphonic acid 6 - 9%

[0011] Sodium polyacrylate 4 - 7%

[0012] Sodium dihydrogen phosphate 6 - 10%

[0013] Ethylenediaminetetramethylenephosphonic acid 3 - 6%

[0014] Disodium ethylenediaminetetraacetate 2 - 5%

[0015] Organophosphonocarboxylic acid 2 - 5%

[0016] The sum of each component is 100%.

[0017] A preparation method of a multi-effect furnace water treatment agent, comprising the following steps:

[0018] S1. Raw material preparation stage: Accurately weigh raw materials such as sodium carbonate, sodium humate, hydroxyethylethylenediphosphonic acid, sodium polyacrylate, sodium dihydrogen phosphate, ethylenediaminetetramethylenephosphonic acid, and organophosphonocarboxylic acid according to the formula ratio, ensure that the purity and quality of the raw materials meet the production requirements, and process or replace the damp and deteriorated raw materials;

[0019] S2. Preliminary mixing stage: Pour the weighed powdery raw materials such as sodium carbonate and sodium dihydrogen phosphate into a container with a stirring device, turn on the stirrer, and stir at a low speed (100 - 200 revolutions per minute) for 15 - 20 minutes to preliminarily mix these powdery raw materials evenly to form a relatively uniform solid mixture;

[0020] S3. Liquid component addition and mixing stage: Slowly add liquid components such as hydroxyethylethylenediphosphonic acid and ethylenediaminetetramethylenephosphonic acid to the preliminarily mixed solid mixture, stir while adding, and increase the stirring speed to 300 - 400 revolutions per minute, and continuously stir for 30 - 40 minutes. During this process, the liquid components will gradually disperse in the solid mixture to form a semi-solid mixed material, ensuring that the liquid components are evenly distributed throughout the system;

[0021] S4. Crushing and Final Mixing Stage: Sodium polyacrylate, sodium humate, and organic phosphonic carboxylic acid are added to the above semi-solid mixed material. While stirring, the mixed material is transferred to a crusher for crushing. Appropriate crushing time and crushing intensity are selected according to the material characteristics and desired particle size. Through crushing, the aggregates in the material can be further broken, enabling each component to be fully mixed physically, improving the uniformity and stability of the product, and finally obtaining a uniform boiler water treatment agent product;

[0022] S5. Adding Process Stage: During the operation of the power generation boiler, continuous quantitative addition is carried out using a high-precision metering pump. According to the flow rate and water quality of the boiler water, the addition speed of the metering pump is set to 0.5 - 1.5 g / min, so that the treatment agent is continuously and stably added to the boiler water. At the same time, every 4 - 6 hours, key indicators such as the pH value and content of the boiler water are detected. If the pH value deviates from the range of 9 - 11, or the content is not between 5 - 15 mg / L, the addition speed of the metering pump is finely adjusted according to the deviation situation. For example, when the pH value is low, the addition speed is appropriately increased; when the content is too high, the addition speed is slightly decreased, so as to ensure that the treatment effect of the boiler water treatment agent is always in the best state.

[0023] (III) Beneficial Effects

[0024] The present invention provides a multi-effect boiler water treatment agent, which has the following beneficial effects:

[0025] 1. The present invention provides a multi-effect boiler water treatment agent. Through the synergistic action of multiple components, this multi-effect boiler water treatment agent can effectively remove the residual scale in the boiler and prevent the formation of new scale. Among them, the components of hydroxyethylidene diphosphonic acid, ethylenediaminetetramethylenephosphonic acid, and organic phosphonic carboxylic acid, with their good scale inhibition and scale removal performance, can form stable complexes with scale-forming ions such as calcium and magnesium in water, prevent the crystallization and precipitation of water scale, and at the same time dissolve and peel off the existing water scale, enabling the boiler to operate without scale, greatly reducing the problem of reduced heat transfer efficiency caused by scaling, reducing fuel consumption, and improving the operation efficiency of the boiler.

[0026] 2. The present invention provides a multi-effect boiler water treatment agent. Sodium humate and ethylenediaminetetramethylenephosphonic acid form a dense gray-black protective film on the metal surface, effectively isolating the metal from corrosive substances in water and preventing residual oxygen corrosion. Sodium carbonate maintains an appropriate alkaline environment in the boiler water and inhibits the occurrence of corrosion reactions. This dual protection mechanism greatly reduces the risk of leakage of the boiler wall tubes due to corrosion, extends the service life of the boiler, reduces the maintenance cost, and provides a reliable guarantee for the safe and stable operation of the boiler. Specific Embodiments

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] The embodiments of the present invention provide a preparation method for a multi-effect furnace water treatment agent, which specifically includes the following steps:

[0029] S1. Raw material preparation stage: Accurately weigh raw materials such as sodium carbonate, sodium humate, hydroxyethylidene diphosphonic acid, sodium polyacrylate, sodium dihydrogen phosphate, ethylenediamine tetramethylene phosphonic acid, and organic phosphonate carboxylic acid according to the formula ratio, ensure that the purity and quality of the raw materials meet the production requirements, and process or replace the damp and deteriorated raw materials.

[0030] S2. Preliminary mixing stage: Pour the weighed powdery raw materials such as sodium carbonate and sodium dihydrogen phosphate into a container with a stirring device, turn on the stirrer, and stir at a low speed (100 - 200 revolutions per minute) for 15 - 20 minutes to preliminarily mix these powdery raw materials evenly to form a relatively uniform solid mixture.

[0031] S3. Liquid component addition and mixing stage: Slowly add liquid components such as hydroxyethylidene diphosphonic acid and ethylenediamine tetramethylene phosphonic acid to the preliminarily mixed solid mixture, stir while adding, and increase the stirring speed to 300 - 400 revolutions per minute, and continuously stir for 30 - 40 minutes. During this process, the liquid components will gradually disperse in the solid mixture to form a semi-solid mixed material, ensuring that the liquid components are evenly distributed throughout the system.

[0032] S4. Crushing and final mixing stage: Add sodium polyacrylate, sodium humate, and organic phosphonate carboxylic acid to the above semi-solid mixed material, and while stirring, transfer the mixed material to a crusher for crushing treatment. The specific parameters of the crushing process are as follows:

[0033] Crushing time: 15 - 25 minutes. According to the initial state of the material and the desired particle size, it can be flexibly adjusted within this range. If the material agglomerates severely, or a finer particle size is desired, the crushing time can be appropriately extended to 25 minutes; if the material itself has good dispersibility, it can be shortened to 15 minutes.

[0034] Crushing speed: 1500 - 3000 revolutions per minute. A higher speed can provide stronger crushing force, but it may also generate too much heat and affect the material properties. For most cases, it is more appropriate to select a speed of 2000 - 2500 revolutions per minute.

[0035] Feeding speed: Controlled at 1 - 3 kg / min. An excessively fast feeding speed may lead to insufficient pulverization and affect the mixing uniformity; an excessively slow feeding speed will reduce production efficiency.

[0036] Through the above pulverization treatment, the agglomerates in the material are further broken, enabling each component to be fully mixed at the physical level, improving the uniformity and stability of the product, and finally obtaining a uniform boiler water treatment agent product.

[0037] S5. Addition process stage: During the operation of the power generation boiler, continuous quantitative addition is carried out using a high-precision metering pump. According to the flow rate and water quality of the boiler water, the addition speed of the metering pump is set to 0.5 - 1.5 g / min, so that the treatment agent is continuously and stably added to the boiler water. At the same time, every 4 - 6 hours, the key indicators such as the pH value content of the boiler water are detected. If the pH value deviates from the range of 9 - 11, or the content is not between 5 - 15 mg / L, the addition speed of the metering pump is finely adjusted according to the deviation situation. For example, when the pH value is low, the addition speed is appropriately increased; when the content is too high, the addition speed is slightly decreased, so as to ensure that the treatment effect of the boiler water treatment agent is always in the best state.

[0038] Example 1

[0039] Formula: Sodium carbonate 60%, sodium humate 15%, hydroxyethylidene diphosphonic acid 7%, sodium polyacrylate 6%, sodium dihydrogen phosphate 8%, ethylenediaminetetramethylenephosphonic acid 4%, organic phosphonocarboxylic acid (POCA) 3%.

[0040] Preparation process: Weigh each raw material accurately according to the above formula. First, mix and stir sodium carbonate and sodium dihydrogen phosphate evenly, then add hydroxyethylidene diphosphonic acid and ethylenediaminetetramethylenephosphonic acid and stir, and finally add sodium polyacrylate, sodium humate and POCA, and stir for 20 minutes.

[0041] Addition process: In a power generation boiler with an evaporation capacity of 100 t / h, use a high-precision metering pump to continuously add the treatment agent at a speed of 1 g / min, and detect the boiler water indicators every 4 hours and finely adjust the addition speed according to the results.

[0042] Example 2

[0043] Formula: Sodium carbonate 55%, sodium humate 18%, hydroxyethylidene diphosphonic acid 8%, sodium polyacrylate 5%, sodium dihydrogen phosphate 9%, ethylenediaminetetramethylenephosphonic acid 5%, organic phosphonocarboxylic acid (POCA) 5%.

[0044] Preparation process: The same as Example 1.

[0045] Addition process: Continuously add at a rate of 1.2 g / min in a power generation boiler with an evaporation capacity of 120 t / h, and detect the boiler water index and adjust the addition amount every 5 hours.

[0046] Example 3

[0047] Formula: Sodium carbonate 65%, sodium humate 13%, hydroxyethylidene diphosphonic acid 6%, sodium polyacrylate 7%, sodium dihydrogen phosphate 6%, ethylenediamine tetramethylene phosphonic acid 3%, organic phosphonocarboxylic acid (POCA) 2%.

[0048] Preparation process: The same as that of Example 1.

[0049] Addition process: Continuously add at a rate of 0.8 g / min in a power generation boiler with an evaporation capacity of 80 t / h, and detect the boiler water index and optimize the addition amount every 6 hours.

[0050] Experimental results of Example 1

[0051] Scale prevention effect: After running for 30 days, through the internal inspection of the boiler, it was found that a small amount of original scale was effectively removed, and no new scale was generated. By detecting the boiler water, the concentrations of calcium and magnesium ions were significantly reduced, and the scaling tendency was significantly decreased.

[0052] Corrosion protection effect: Use corrosion monitoring equipment to detect the corrosion rate of the boiler metal wall. The result shows that the corrosion rate is 0.05 mm / a, far lower than the industry standard (0.1 mm / a). A continuous and dense gray-black protective film was formed on the boiler metal surface, effectively preventing corrosion from occurring.

[0053] Water quality index: The pH value of the boiler water is stably maintained between 9.5 - 10.5, and the PO4 -3 content is maintained at 8 - 12 mg / L, meeting the boiler operation water quality standard. The steam quality test results show that the impurity content in the steam is extremely low and has no adverse effect on the steam using equipment.

[0054] Experimental results of Example 2

[0055] Scale prevention effect: After running for 35 days, there is basically no scale inside the boiler, and only very few slight scaling traces are found in local positions. The concentrations of calcium and magnesium ions in the boiler water are controlled at a low level, and the scale prevention effect is good.

[0056] Corrosion protection effect: The corrosion rate of the metal wall is 0.04 mm / a, and the protective film is complete and evenly covers the metal surface, playing a good protective role for the boiler metal.

[0057] Water quality index: The pH value of the boiler water fluctuates between 9.2 - 10.8, content is stably maintained at 7 - 13 mg / L, the steam quality is excellent, and no impurity exceeding the standard phenomenon occurs.

[0058] Experimental Results of Example 3

[0059] Scale prevention effect: After 25 days of operation, a large amount of residual scale in the boiler was removed, and the generation amount of new scale was extremely small. The boiler water analysis shows that the concentrations of calcium and magnesium ions were effectively controlled, and the scale prevention performance was reliable.

[0060] Corrosion protection effect: The corrosion rate was 0.06 mm / a. The metal surface protective film could effectively resist corrosion and ensure the safe operation of the boiler.

[0061] Water quality index: The pH value of the boiler water was maintained between 9.0 - 11.0, and the content was in the range of 6 - 14 mg / L. The steam quality met the production requirements.

[0062] From the analysis of the experimental results of the above-mentioned multiple examples, it can be seen that this multi-effect boiler water treatment agent exhibits excellent scale prevention, scale removal, and corrosion prevention performance under different formulations and operating conditions. The treatment agents in each example can effectively reduce the concentrations of calcium and magnesium ions in the boiler water, prevent the formation of scale and remove residual scale; at the same time, the protective film formed on the metal surface of the boiler significantly reduces the corrosion rate and ensures the safe and stable operation of the boiler. The pH value of the boiler water and the content can both be stably controlled within the standard range, and the steam quality is not affected. Different formulations have their own advantages in practical applications. According to factors such as the specific operating parameters of the boiler and the water quality conditions, the appropriate formulation and addition process can be selected to achieve the best treatment effect. Generally speaking, this multi-effect boiler water treatment agent can effectively solve the problems existing in traditional boiler water treatment methods and provide reliable technical support for the efficient and safe operation of boilers.

[0063] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-effect furnace water treatment agent, characterized in that, The raw materials of the multi-effect boiler water treatment agent consist of the following components by mass percentage: Sodium carbonate 55 - 65% Sodium humate 13 - 20% Hydroxyethane diphosphonic acid 6 - 9% Sodium polyacrylate 4 - 7% Sodium dihydrogen phosphate 6 - 10% Ethylenediamine tetramethylenephosphonic acid 3 - 6% (There is also disodium ethylenediaminetetraacetate, abbreviated as EDTI, in the raw materials) Disodium ethylenediaminetetraacetate 2 - 5% Organophosphonocarboxylic acid 2 - 5% The sum of each component is 100%.

2. The preparation method of the multi-effect furnace water treatment agent according to claim 1, characterized in that, It includes the following steps: S1. Raw material preparation stage: Accurately weigh the raw materials of sodium carbonate, sodium humate, hydroxyethane diphosphonic acid, sodium polyacrylate, sodium dihydrogen phosphate, ethylenediamine tetramethylenephosphonic acid, disodium ethylenediaminetetraacetate and organophosphonocarboxylic acid according to the formula ratio, ensure that the purity and quality of the raw materials meet the production requirements, and process or replace the damp and deteriorated raw materials; S2. Preliminary mixing stage: Pour the powdered raw materials such as sodium carbonate, sodium dihydrogen phosphate, and disodium ethylenediaminetetraacetate that have been weighed into a container with a stirring device, turn on the stirrer, and stir at a low speed (100 - 200 revolutions per minute) for 15 - 20 minutes to preliminarily mix these powdered raw materials evenly to form a relatively uniform solid mixture; S3. Liquid component addition and mixing stage: Slowly add the liquid components such as hydroxyethane diphosphonic acid and ethylenediamine tetramethylenephosphonic acid to the preliminarily mixed solid mixture, stir while adding, and increase the stirring speed to 300 - 400 revolutions per minute, and continue to stir for 30 - 40 minutes. During this process, the liquid components will gradually disperse in the solid mixture to form a semi-solid mixed material, ensuring that the liquid components are evenly distributed throughout the system; S4. Crushing and final mixing stage: Add sodium polyacrylate, sodium humate and organophosphonocarboxylic acid to the above semi-solid mixed material, and while stirring, transfer the mixed material to a crusher for crushing treatment. Select appropriate crushing time and crushing intensity according to the material characteristics and expected particle size. Through crushing, the agglomerates in the material can be further broken, enabling the components to be fully mixed physically, improving the uniformity and stability of the product, and finally obtaining a uniform boiler water treatment agent product; S5. Addition process stage: During the operation of the power generation boiler, continuous quantitative addition is carried out using a high-precision metering pump. According to the flow rate and water quality of the boiler water, the addition speed of the metering pump is set to 0.5 - 1.5 g / min, so that the treatment agent is continuously and stably added to the boiler water. At the same time, every 4 - 6 hours, the key indicators such as the pH value and content of the boiler water are detected. If the pH value deviates from the range of 9 - 11, or the content is not between 5 - 15 mg / L, the addition speed of the metering pump is finely adjusted according to the deviation situation. For example, when the pH value is low, the addition speed is appropriately increased; when the content is too high, the addition speed is slightly decreased, so as to ensure that the treatment effect of the boiler water treatment agent is always in the best state.

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