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CN-118908428-B - Cylinder cleaning agent with functions of scale prevention and steam purification and preparation method thereof

CN118908428BCN 118908428 BCN118908428 BCN 118908428BCN-118908428-B

Abstract

The invention relates to the technical field of boiler water treatment, in particular to a cylinder cleaning agent with the functions of scale prevention and steam purification and a preparation method thereof, and the cylinder cleaning agent comprises, by mass, 20-40 parts of self-made scale inhibitor, 3-5 parts of penetrating agent, 20-30 parts of dispersing agent, 1-5 parts of deoxidizer, 0.003-0.017 part of catalyst and 100-150 parts of water. The cylinder cleaning agent prepared by the invention is suitable for medium-low pressure boilers, has the functions of inhibiting corrosion and scale, purifying steam and inhibiting microbial mud.

Inventors

  • CHEN DAILI
  • LIANG HUAQIANG
  • FENG PEIXUAN

Assignees

  • 汇科琪(天津)水质添加剂有限公司

Dates

Publication Date
20260505
Application Date
20240731

Claims (9)

  1. 1. The cylinder cleaning agent with the functions of preventing scale and purifying steam is characterized by comprising, by mass, 20-40 parts of self-made scale inhibitor, 3-5 parts of penetrating agent, 20-30 parts of dispersing agent, 1-5 parts of deoxidizer, 0.003-0.017 part of catalyst and 100-150 parts of water; the self-made scale inhibitor has the structure that: ; wherein, the a is more than or equal to 10 and less than or equal to 15, 6b is more than or equal to 10.
  2. 2. The cylinder cleaning agent with the functions of preventing scale and purifying steam according to claim 1, wherein the preparation method of the self-made scale inhibitor comprises the following steps: S1, a compound shown in a formula I (I) Adding the compound into a first solvent together with trimethyliodosilane, stirring for 4-6 hours at room temperature, adding triethylamine, continuously stirring for 20-25 minutes, removing the solvent under reduced pressure, adding ethanol, and centrifugally filtering to obtain a compound E; S2, mixing polysuccinimide with water, dissolving the compound E in the step S1 in a sodium hydroxide solution, dripping the solution into the mixed solution of polysuccinimide and water at a dripping rate of 10-15 mL/min, stirring for 26-30 h at room temperature, adjusting pH to 7-8 after the reaction is finished, adding ethanol, centrifuging, filtering and drying to obtain the compound shown in the formula II (II); And S3, mixing the compound shown in the formula II in the step S2, tetramethyl ammonium chloride and methanol, standing for 3-5 hours, and performing ion exchange to obtain the self-made scale inhibitor.
  3. 3. The cylinder cleaning agent with the anti-scale and steam-purifying effects as claimed in claim 2, wherein the preparation method of the compound shown in the formula I comprises the following steps: S11, carrying out Michael addition reaction on ethylenediamine and methyl acrylate to obtain a compound A; s12, carrying out amidation reaction on the compound A in the step S11 and ethylenediamine to obtain a compound B; S13, dissolving the compound B and the first acid binding agent in the step S12 in a second solvent, cooling to-5 ℃, slowly adding benzyl chloroformate into the second solvent, and heating to room temperature after adding, and stirring for 4-5 hours to obtain a compound C; S14, adding the compound C in the step S13 and 2-naphthaldehyde into a third solvent, mixing, heating to 50-60 ℃, stirring for 6-7 hours at constant temperature, cooling the reaction liquid to room temperature, adding sodium borohydride into the reaction liquid, continuously stirring for 40-50 minutes, quenching at low temperature after the reaction is finished, and concentrating under reduced pressure through extraction to obtain a compound D; And S15, mixing and stirring the compound D in the step S14 with deionized water uniformly, adding a second acid binding agent into the mixture, controlling the temperature to room temperature, dropwise adding an aqueous solution of chloroacetic acid into the system, stirring the mixture at a constant temperature for 1-3 h after the dropwise adding is finished, and concentrating the mixture under reduced pressure and passing through a chromatographic column after the reaction is finished to obtain the compound shown in the formula I.
  4. 4. The cylinder cleaning agent with the anti-scaling and steam purifying effects according to claim 2, wherein in the step S3, the mass ratio of the polysuccinimide to the compound E is 1 (0.3-0.6).
  5. 5. A cylinder cleaning agent with the anti-scaling and steam purifying effects according to claim 3, wherein in the step S13, the molar ratio of the compound B to benzyl chloroformate is 1 (1.1-1.2).
  6. 6. A cylinder cleaning agent with the functions of preventing scale and purifying steam according to claim 3, wherein in the step S14, the molar ratio of the compound C to the 2-naphthaldehyde is 1 (2-2.2).
  7. 7. The cylinder cleaning agent with the functions of scale prevention and steam purification according to claim 1, wherein the dispersing agent is one or more of acrylic acid, polyacrylic acid, sodium polyacrylate, sodium lignin sulfonate and sodium dodecyl sulfonate.
  8. 8. The cylinder cleaning agent with the anti-scaling and steam purifying effects according to claim 1, wherein the mass ratio of the self-made scale inhibitor to the deoxidizer to the catalyst is 1 (0.06-0.1) (0.0002-0.0004).
  9. 9. A method for preparing the cylinder cleaning agent with the functions of preventing scale and purifying steam according to any one of claims 1-8 is characterized by comprising the following steps of mixing a self-made scale inhibitor, a penetrating agent, a dispersing agent, an deoxidizing agent, a catalyst and water, and then adjusting the pH value of a system to be 8-9, so that the cylinder cleaning agent is obtained.

Description

Cylinder cleaning agent with functions of scale prevention and steam purification and preparation method thereof Technical Field The invention relates to the technical field of boiler water treatment, in particular to a cylinder cleaning agent with the functions of scale prevention and steam purification and a preparation method thereof. Background The boiler is widely used equipment in China, is widely applied to the fields of thermal power generation, petrochemical industry, mining industry and the like, and along with the wide use of the boiler, the defects of the boiler are more remarkable, wherein the boiler explosion accident is the most attractive one. The explosion is not easy to happen when the boiler is normally used, the explosion reason is mainly that the material strength of the boiler is weakened, and the explosion is easy to happen when the pressure in the boiler exceeds the strength of the material, so that the weakening of the material is the root cause for triggering the explosion of the boiler. Researchers have studied the weakening of materials, which is generally caused by aging, corrosion and overtemperature phenomena, and scale is one of the main factors causing corrosion phenomena. The boiler water is mainly industrial water, contains rich metal cations such as Ca +、Mg+、Fe+ and anions such as OH -、CO3-、SO4-, and has the concentration increasing to form scale when the boiler water is evaporated, and other microbial sludge is one of the reasons of material corrosion. The most common method at present is to add some water treatment agents to prevent the generation of scale, and to add bactericides to inhibit the propagation of microorganisms to reduce the generation of microbial sludge. The water treatment agent is divided into inorganic corrosion inhibitors and organic corrosion inhibitors, wherein the inorganic corrosion inhibitors mainly comprise chromate, molybdate, tungstate, arsenic compounds and the like, the inorganic corrosion inhibitors have great harm to the environment and are expensive, the use of the inorganic corrosion inhibitors is limited, and the common organic corrosion inhibitors can be divided into amine corrosion inhibitors, aldehyde corrosion inhibitors, alkynol corrosion inhibitors, organic phosphorus corrosion inhibitors, sulfur compound corrosion inhibitors, carboxylic acid corrosion inhibitors, sulfonic acid corrosion inhibitors and the like, and the corrosion inhibitors have various advantages and disadvantages. For example, CN106434047a discloses a "quick scale remover for boiler", which is prepared from tartaric acid, sulfamic acid, trisodium phosphate, sodium tripolyphosphate, penetrant, sodium hydroxymethylcellulose and the like as raw materials, and the scale remover prepared by the disclosed patent has a better boiler scale removing effect and can keep the scale inhibiting effect for a long time. As another example, CN113044998B discloses a "boiler water-feeding agent, its preparation method and application", which is prepared by using sodium sulfite and sodium metabisulfite as main raw materials, and the water-feeding agent prepared by the disclosed patent has better deoxidizing effect, and can be used together with polyaspartic acid to quickly play a role in corrosion and scale inhibition. However, the above-mentioned patent publication uses phosphorus-containing sulfur-containing compound as corrosion and scale inhibitor, which is difficult in the post-treatment process and is liable to affect the environment. And as disclosed in CN111233178A, the phosphorus-free composite cylinder cleaning agent for low-pressure boilers and the preparation method thereof are prepared by adopting an deoxidizing component, a slow-release component, a scale inhibiting component and the like as main raw materials, wherein the cylinder cleaning agent prepared by the disclosed patent does not contain phosphorus, can eliminate dissolved oxygen corrosion in boiler water and has a corrosion inhibition and scale inhibition effect, but the disclosed patent only mentions that the product is suitable for low-pressure boilers and cannot solve the problem of medium-pressure boilers. Therefore, the development of a cylinder cleaning agent which is applicable to a medium-low pressure boiler, has the functions of corrosion inhibition, scale inhibition and steam purification and can inhibit the generation of microbial mud is urgent. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides a cylinder cleaning agent with the functions of scale prevention and steam purification and a preparation method thereof. The cylinder cleaning agent is suitable for medium-low pressure boilers, has the functions of inhibiting corrosion, inhibiting scale and purifying steam, and can inhibit microbial mud from generating. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the invention provides a cylinder cleaning