CN107034473B - Efficient environment-friendly boiler hot water corrosion inhibitor and application thereof - Google Patents
Efficient environment-friendly boiler hot water corrosion inhibitor and application thereof Download PDFInfo
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- CN107034473B CN107034473B CN201710273378.2A CN201710273378A CN107034473B CN 107034473 B CN107034473 B CN 107034473B CN 201710273378 A CN201710273378 A CN 201710273378A CN 107034473 B CN107034473 B CN 107034473B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/12—Oxygen-containing compounds
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- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a boiler hot water corrosion inhibitor with simple components, high efficiency and environmental protection and application thereof. The corrosion inhibitor mainly comprises fatty alcohol polyoxyethylene (15) ether, wherein the addition concentration of the fatty alcohol polyoxyethylene (15) ether is 8 g/L. By simulating a boiler hot water environment, the corrosion inhibition effect of different reagent addition amounts in the formula is tested, the formula composition with the highest corrosion inhibition rate is determined, and the highest corrosion inhibition rate reaches 93.1%. Further adjusting the pH value of the boiler hot water, the corrosion inhibitor formula is not sensitive to acidity and alkalinity. The boiler hot water corrosion inhibitor has the greatest advantages that the water corrosion is prevented from forming on the inner wall of the boiler through the complexing action, and the formation of a corrosion generation environment is inhibited. The safety and the service life of the boiler are improved. Has great guiding significance for reality.
Description
Technical Field
The invention belongs to the field of boiler water treatment, and particularly relates to a high-efficiency environment-friendly boiler hot water corrosion inhibitor formula and application thereof.
Background
With the continuous development and progress of society, the scale of industrial production and the living standard of people are continuously improved, and the boiler is more and more produced and used in China. Boiler water quality treatment is an important work content for ensuring the safe and economic operation of boiler equipment. The purpose of boiler water treatment is to prevent scaling and corrosion of the boiler and ensure good working condition and quality of the boiler. The boiler water treatment is well done, which is of great significance to ensure the safe and economic operation of the boiler, save resources and protect the environment. In recent years, the accident of thermodynamic equipment in China accounts for 40% -50% caused by corrosion. Statistics in recent years abroad have also shown that thermodynamic plant efficiency losses are up to 3% per year, where 2/3 is due to corrosion. More than thousands of industrial boilers scrapped due to corrosion in China every year, and the corrosion loss of the boilers per year can reach more than 3 hundred million yuan. The corrosion is one of the reasons for the failure of the heating surface of the boiler and the accident shutdown of the thermal power plant. With the continuous development of water purification technology outside the boiler and the effective control of scaling problems, the corrosion problem of a boiler water vapor system is particularly prominent. Therefore, the prevention of corrosion of the boiler water vapor system is an important task for boiler water treatment. Therefore, the research on the corrosion inhibition technology of the hot water boiler has more important practical significance.
The metal corrosion process is a complex multiphase reaction that occurs at the metal-dielectric interface, so that the damage always penetrates progressively from the metal surface to the inside. When metal is corroded, appearance change generally occurs at the same time, and the appearance change is usually manifested as ulcer spots, pores, corrosion products on the surface or thinning of metal materials and the like; the internal change mainly refers to the change of the mechanical property and the structure of the metal, such as the brittleness, the reduction of the strength, the change of the content of certain element in the metal or the change of the structure of the metal. It is particularly to be mentioned that the metal has not yet corroded to such an extent that it is destroyed or severely deteriorated enough to cause accidents or damage to the equipment. The corrosion process can be divided into two main categories, namely electrochemical corrosion and chemical corrosion. Electrochemical corrosion refers to the destruction of a metal surface by electrochemical action of at least one electrode reaction with a medium. Electrochemical corrosion is the most common and common corrosion, and oxygen corrosion, acid corrosion, alkaline corrosion and the like which are common in boilers belong to electrochemical corrosion. Chemical corrosion refers to the purely chemical interaction between the metal surface and the boiler water. If the corrosion of the superheated steam to the inner wall of the superheater tube of the boiler belongs to chemical corrosion, and other corrosion is electrochemical corrosion.
The corrosion inhibition technology of the existing hot water boiler is to carry out oxygen removal treatment on boiler water, because oxygen is a main factor of corrosion. Common methods for oxygen removal are thermal, vacuum, desorption, and chemical oxygen removal. The common chemical oxygen-removing agents include inorganic additives such as hydrazine, sodium sulfite, sulfur dioxide and ferrous hydroxide, and novel organic oxygen-removing agents such as hydrazine carbonate, aminoethanolamine, hydroquinone, methyl ethyl ketoxime, composite acetaldoxime, and the like. The corrosion inhibition mechanism of the additives is to reduce the oxygen content in water and inhibit the boiler from generating a corrosion process in which dissolved oxygen participates.
The development of a novel corrosion inhibitor which is efficient and environment-friendly is an important research topic in the technical field of boiler water corrosion inhibition. Based on the idea, the invention provides a novel organic corrosion inhibitor formula for a hot water boiler. On the premise of ensuring that the formulated medicament does not cause harm to the environment, the high corrosion inhibition rate is achieved.
Disclosure of Invention
Aiming at the current research situation, the invention aims to provide a novel efficient and environment-friendly boiler hot water corrosion inhibitor, and aims to solve the technical problems that the corrosion problem occurs in the operation process of a hot water boiler, the heat transfer efficiency of the boiler is influenced, the safety production is threatened, and meanwhile, the formula of the corrosion inhibitor is provided.
The formula of the corrosion inhibitor disclosed by the invention is as follows:
a corrosion inhibitor for hot water of boilers is characterized in that the component comprises fatty alcohol polyoxyethylene (15) ether; the addition amount of the fatty alcohol polyoxyethylene (15) ether is 1-16 g/L. The fatty alcohol polyoxyethylene (15) ether is preferably added at a concentration of 8 g/L.
The corrosion inhibitor for the boiler hot water is insensitive to the acidity and the alkalinity of the boiler hot water. The corrosion inhibitor can prevent hot water of the boiler from corroding the boiler due to the composition of organic matters in the formula, and the corrosion inhibition mechanism is that the environment for corroding the boiler is not formed. The hot water of the boiler can be prevented from corroding the boiler in the running process of the boiler, so that the safety of the boiler is improved, and the service life of the boiler is prolonged.
The corrosion inhibition effect of the corrosion inhibitor formula is verified through a static experiment, the highest corrosion inhibition rate reaches 93.1%, and the corrosion inhibitor with the highest corrosion inhibition rate comprises the following components in percentage by weight: the addition amount of the fatty alcohol polyoxyethylene (15) ether is 8 g/L.
The invention further discloses an experimental method for verifying the corrosion inhibition rate by the influence of the change of the formula composition of the corrosion inhibitor on the corrosion inhibition effect, which comprises the following steps:
(1) preparing a boiler water sample: dissolving calcium chloride, magnesium chloride and sodium bicarbonate in water at concentrations of 0.194 g/L, 0.167 g/L and 0.252 g/L respectively, wherein the total hardness of the corresponding water sample is 7 mmol/L, the calcium hardness is 3.5 mmol/L, and the alkalinity is 3 mmol/L;
(2) the corrosion inhibitor is prepared by the following formula: dissolving 1 g-16 g of fatty alcohol polyoxyethylene (15) ether in the prepared water sample;
(3) and (3) evaluating the corrosion inhibition effect by a static test: 250 mL of boiler water sample added with different corrosion inhibitor formulas is put into a 500mL conical flask, a 20# steel standard corrosion test piece (50 multiplied by 25 multiplied by 2 mm) hanging piece is hung in the conical flask, and the boiler water sample is kept for 8 hours in a constant temperature water bath tank at 70 ℃. And weighing the mass of the coupon before and after corrosion, calculating the corrosion rate, and calculating the corrosion inhibition rate by comparing the corrosion rate with the coupon corrosion rate in a blank water sample.
(4) The corrosion inhibition effect calculation formula is as follows:
corrosion rate calculation formula:
wherein:
g is the weight change of the test piece before and after the hanging test; s is the area of the hanging piece, m2；tFor the soaking time, h
Wherein: m isl' and mlThe mass g of the hanging piece before and after the blank test is respectively; m is2' and m2Respectively the mass g of the coupon before and after the corrosion inhibitor is added;
the rust amount of the blank test hanging piece is g;
the corrosion amount of the hanging piece added with the corrosion inhibitor is g.
Compared with the prior corrosion inhibitor formula, the novel efficient and environment-friendly boiler hot water corrosion inhibitor formula disclosed by the invention has the positive effects that:
(1) pure organic components are adopted, and complexing is carried out on calcium ions, magnesium ions and the like, so that the ions are prevented from forming insoluble precipitates, and the use is convenient.
(2) The invention has simple formula composition and low cost of the used raw materials, and is beneficial to future industrial scale application.
Detailed Description
The invention is described below by means of specific embodiments. Unless otherwise specified, the technical means used in the present invention are well known to those skilled in the art. In addition, the embodiments should be considered illustrative, and not restrictive, of the scope of the invention, which is defined solely by the claims. It will be apparent to those skilled in the art that various changes or modifications in the components and amounts of these embodiments may be made without departing from the spirit and scope of the invention. The fatty alcohol polyoxyethylene (15) ether used in the invention is commercially available and purchased from Haian petrochemical plants in Jiangsu province.
Example 1
A novel high-efficiency environment-friendly boiler hot water corrosion inhibitor formula comprises:
fatty alcohol polyoxyethylene (15) ether: 1 g/L, and the corrosion inhibition rate is detected in a water sample with pH = 7.
Example 2
A novel high-efficiency environment-friendly boiler hot water corrosion inhibitor formula comprises:
fatty alcohol polyoxyethylene (15) ether: 2 g/L, and the corrosion inhibition rate is detected in a water sample with pH = 7.
Example 3
A novel high-efficiency environment-friendly boiler hot water corrosion inhibitor formula comprises:
fatty alcohol polyoxyethylene (15) ether: 4 g/L, and the corrosion inhibition rate is detected in a water sample with pH = 7.
Example 4
A novel high-efficiency environment-friendly boiler hot water corrosion inhibitor formula comprises:
fatty alcohol polyoxyethylene (15) ether: 8 g/L, and the corrosion inhibition rate is detected in a water sample with pH = 7.
Example 5
A novel high-efficiency environment-friendly boiler hot water corrosion inhibitor formula comprises:
fatty alcohol polyoxyethylene (15) ether: 16 g/L, and the corrosion inhibition rate is detected in a water sample with pH = 7.
Example 6
A novel high-efficiency environment-friendly boiler hot water corrosion inhibitor formula comprises:
fatty alcohol polyoxyethylene (15) ether: 8 g/L, and the corrosion inhibition rate is detected in a water sample with pH = 8.
Reference example 1
Fatty alcohol-free polyoxyethylene (15) ether, corrosion rate was measured in water samples pH = 7: 0.58 g/m2·h。
Table 1 shows the results of the corrosion inhibition tests of examples 1 to 6
Attached table 1 corrosion inhibition effect parameters using the boiler hot water corrosion inhibitor formulation of the present invention
Example 7
Comparative test
And (4) comparing and concluding: after the fatty alcohol polyoxyethylene (15) ether is added, the corrosion rate is obviously reduced, the corrosion inhibition rate reaches 93.1 percent, no scale is generated, and the environment with corrosion caused by scale deposition is prevented.
And (4) conclusion: from the corrosion inhibition results of the above embodiments, the formula of the corrosion inhibitor disclosed by the invention has a good corrosion inhibition effect, the maximum corrosion inhibition rate reaches 93.1%, and the formula is a hot water boiler corrosion inhibitor with simple components, high efficiency and environmental friendliness.
Claims (2)
1. A method for preventing hot water of a boiler from corroding the boiler in the running process of a hot water boiler is characterized in that fatty alcohol polyoxyethylene (15) ether is added into the hot water of the boiler; the addition amount of the fatty alcohol polyoxyethylene (15) ether is 8-16 g/L.
2. The method for preventing hot water of a boiler from corroding the boiler during the operation of the hot water boiler as set forth in claim 1, wherein the fatty alcohol polyoxyethylene (15) ether is added at a concentration of 8 g/L.
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