CN107674778B - Chemical cleaning agent for removing hard scale of air preheater and preparation method thereof - Google Patents

Chemical cleaning agent for removing hard scale of air preheater and preparation method thereof Download PDF

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Publication number
CN107674778B
CN107674778B CN201711051027.3A CN201711051027A CN107674778B CN 107674778 B CN107674778 B CN 107674778B CN 201711051027 A CN201711051027 A CN 201711051027A CN 107674778 B CN107674778 B CN 107674778B
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parts
weight
mixture
air preheater
stirring
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CN107674778A (en
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陈海玲
宋伟
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Nanyang Institute of Technology
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Nanyang Institute of Technology
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    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/66—Non-ionic compounds
    • C11D1/83—Mixtures of non-ionic with anionic compounds
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/86—Mixtures of anionic, cationic, and non-ionic compounds
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/0005—Other compounding ingredients characterised by their effect
    • C11D3/0026—Low foaming or foam regulating compositions
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    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/0005—Other compounding ingredients characterised by their effect
    • C11D3/0073—Anticorrosion compositions
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    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/044—Hydroxides or bases
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    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/06—Phosphates, including polyphosphates
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
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    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/162—Organic compounds containing Si
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    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/20—Organic compounds containing oxygen
    • C11D3/2072—Aldehydes-ketones
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/26—Organic compounds containing nitrogen
    • C11D3/28—Heterocyclic compounds containing nitrogen in the ring
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/26—Organic compounds containing nitrogen
    • C11D3/30—Amines; Substituted amines ; Quaternized amines
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    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/26—Organic compounds containing nitrogen
    • C11D3/32—Amides; Substituted amides
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    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/36—Organic compounds containing phosphorus
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    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/37—Polymers
    • C11D3/3703—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C11D3/3715—Polyesters or polycarbonates
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    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/37—Polymers
    • C11D3/3703—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C11D3/3719—Polyamides or polyimides
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    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/37—Polymers
    • C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C11D3/3769—(Co)polymerised monomers containing nitrogen, e.g. carbonamides, nitriles or amines
    • C11D3/3776—Heterocyclic compounds, e.g. lactam
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
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    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/38—Products with no well-defined composition, e.g. natural products
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
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    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/008—Polymeric surface-active agents
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    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
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    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/14—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aliphatic hydrocarbons or mono-alcohols
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    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/14—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aliphatic hydrocarbons or mono-alcohols
    • C11D1/146—Sulfuric acid esters
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    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
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    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
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    • C11D1/62—Quaternary ammonium compounds
    • C—CHEMISTRY; METALLURGY
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    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
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    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/66—Non-ionic compounds
    • C11D1/78—Neutral esters of acids of phosphorus

Abstract

The invention discloses a chemical cleaning agent for removing hard scale of an air preheater, belonging to the technical field of cleaning agents, and comprising the following components in percentage by weight: 22-25.5 parts of 3-methoxypropylamine, 8.3-9.7 parts of pentaerythritol phosphate, 11.2-12.9 parts of N, N-dimethylacetamide, 1.4-2.6 parts of sodium hydroxide, 18.8-20 parts of trisodium phosphate, 7.3-8.8 parts of corrosion inhibitor, 5.6-6.4 parts of stripping agent, 3.2-4.1 parts of penetrating agent, 2.5-3.3 parts of surfactant, 8.7-9.6 parts of scale inhibitor, 3.5-4.4 parts of dispersant and 45-58 parts of water. The cleaning agent provided by the invention has the advantages of good comprehensive performance, obvious cleaning effect and stable performance, and can form a protective layer on the surface of the air preheater, thus achieving the purposes of scale inhibition and corrosion prevention and prolonging the service life of the air preheater.

Description

Chemical cleaning agent for removing hard scale of air preheater and preparation method thereof
Technical Field
The invention relates to the technical field of cleaning agents, and particularly relates to a chemical cleaning agent for removing hard scale of an air preheater and a preparation method thereof.
Background
The rotary air preheater is an important auxiliary device in a boiler of a thermal power plant, and has the functions of reducing the temperature of exhaust smoke and increasing the temperature of hot primary air and hot secondary air. The heat exchange performance directly influences the boiler efficiency and plays a vital role in the safe and stable operation of the boiler in the power plant. However, with the implementation of denitration modification and the long-time operation of equipment, especially in a high-temperature and high-dust environment, the air preheater is easy to generate dust deposition and blockage, so that the system resistance is increased, the heat exchange performance of the air preheater is more seriously affected, and the safe and stable operation of a crisis air-smoke system is realized.
The problem of ash blockage of the air preheater is a ubiquitous problem of each power plant, although the original design of a boiler is provided with ash blowing and water flushing devices, ash scale of the preheater cannot be effectively cleaned, and when the boiler is ignited again, wet ash scale is burnt into bricks, so that ash blockage is more serious. Due to ash blockage of the air preheater, the temperature of a boiler smoke exhaust system rises, the temperature of hot air drops, the resistance of an air-smoke system rises, and the pressure difference between the two sides of the air supply positive pressure side and the air suction positive pressure side is increased, so that the air leakage rate of the air preheater is increased. The ash blockage of the air preheater is different from common ash scale, and particularly after an SCR denitration device is added, the ammonia escape rate is increased, so that strong-adhesion ammonium bisulfate hard scale is generated in the air preheater.
The descaling and cleaning of objects can be divided into two methods, namely physical cleaning and chemical cleaning. Physical cleaning is generally a method of removing dirt from the surface of an object by mechanical or hydraulic action. In fact, the current physical cleaning also comprises a method for removing dirt by using the action of heat energy, the action of electric current, the action of ultrasonic waves and ultraviolet rays. Physical cleaning is dry cleaning in many cases, and there is no problem in wastewater treatment, and even high-pressure washing using the flushing jet effect of water is easier to treat because there is no chemical agent in the discharged water. In contrast, physical cleaning causes less environmental pollution and less harm to human health, and basically has no corrosive damage to equipment. The physical cleaning has the disadvantage that when the interior of equipment with a complex structure is cleaned, the acting force of the equipment sometimes cannot reach all parts uniformly, so that dead corners are formed. Sometimes needs to be disassembled for cleaning, and corresponding power equipment is often needed for providing power for cleaning, and the disadvantages of large occupied area and inconvenient carrying are also caused.
Chemical cleaning is a cleaning method in which a chemical or an aqueous solution thereof chemically reacts with dirt on the surface of an object to be cleaned, and the dirt is dissociated from the surface of the object to be cleaned and dissolved and dispersed in a liquid. The chemical agent used in the chemical cleaning process is called chemical cleaning agent. Chemical cleaning, decontaminating and descaling depend on the reaction capability of chemicals, and many chemicals have the characteristics of strong action and quick reaction. Some chemical agents are liquid and are usually prepared into aqueous solution for use, and the liquid has the characteristics of good fluidity and strong permeability and is easy to be uniformly distributed on all cleaning surfaces, so that the cleaning agent is suitable for cleaning objects with complicated shapes without generating 'dead corners' which can not be cleaned. When the interior of large-scale equipment is cleaned industrially, a closed circulating flow pipeline form can be adopted, and the equipment does not need to be disassembled and cleaned. The cleaning condition can be known and controlled by the detection of the fluid composition.
The disadvantage of chemical cleaning is that when the chemical cleaning solution is not selected properly, the chemical cleaning solution will corrode and damage the body of the cleaned object, resulting in loss. The discharge of waste liquid generated by chemical cleaning is a cause of environmental pollution, and therefore, the chemical cleaning must be equipped with a wastewater treatment apparatus. In addition, when the operation and treatment of the chemical agent are not proper, the health and the safety of the human body are damaged.
In the past, mechanical water is adopted for flushing, only superficial ash on the surface can be flushed, ash scale cannot be thoroughly removed, and even the ash blockage is more and more serious. The chemical descaling is to dissolve or loosen the scale by using a special cleaning agent and is easy to fall off, but the prior cleaning agent has the defects of incomplete descaling, equipment corrosion, damage to an air preheater and the like, so the development of the cleaning agent which can effectively clean the hard scale of the ammonium bisulfate and does not influence the safe production of a unit is urgent.
The patent with the publication number of CN104745337A discloses a neutral chemical cleaning agent for removing hard scale of an air preheater of a desulfurization system and a preparation method thereof. The neutral chemical cleaning agent is prepared by compounding a cleaning main agent, a surfactant, a penetrating agent, liquid alkali and water. The cleaning agent achieves the aim of dissolving dirt by complexing with metasilicate aluminum salt and silicate dirt on the surface of the air preheater contacted with the cleaning agent; cracks and gaps occur inside the scale layer structure through osmosis and expansion. The cleaning agent adopts a safe and environment-friendly neutral scheme, is nontoxic, and the main cleaning agent of the main compound is easily biodegraded, so that the environmental problem does not exist; the cleaning agent has the characteristics of rapid descaling, no corrosion to a steel frame, no damage to enamel heat exchange elements, no damage to scale anti-corrosion materials and the like, improves the heat exchange efficiency of heat exchange equipment, dredges ventilation channels, and ensures the safe and economic operation of units. . In the cleaning application of the air preheater, the cleaning agent has the advantages of 98% of removal rate of hard scale, incomplete descaling, unsatisfactory cleaning effect, unstable cleaning agent, high temperature and low temperature environment, reduced cleaning capacity and limited use temperature range.
The patent with publication number CN102242028A discloses a neutral cleaning agent, which is composed of the following raw materials in parts by mass: 30-50% of a cleaning main agent, 0.5-2.5% of a surfactant, 0.2-2.5% of a penetrating agent, 2-8% of a cosolvent, 15-25% of alkali and the balance of water; the pH value of the cleaning agent is 7-9; the cleaning main agent is a polycarboxylic acid compound and/or an organic carboxylic acid compound. Compared with the prior art, the invention has the beneficial effects that: the cleaning agent has the advantages of thorough removal of hard scale, no corrosion to metal, enamel, glass and the like, no toxicity to human bodies, safe discharge and recycle of waste liquid, and is an efficient, safe and environment-friendly neutral cleaning agent; the method can quickly and effectively clean stubborn scales on the surface of a GGH heat exchange element of a desulfurization system, the cleaning period is 5-7 days, the cleaning effect can reach the performance test and assessment standard of a power plant, and the method contributes to energy conservation and emission reduction. However, the cleaning agent generates more foams in the cleaning process, is not beneficial to washing, cannot play a role in scale inhibition and corrosion inhibition on equipment, and has the advantages of high hard scale accumulation rate and short cleaning period after cleaning, so that the service life of the equipment is influenced.
Disclosure of Invention
In view of the above, the invention provides a chemical cleaning agent for removing hard scale of an air preheater, which has good comprehensive performance, obvious cleaning effect and stable performance, and a preparation method thereof.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a chemical cleaning agent for removing hard scale of an air preheater comprises the following components in percentage by weight: 22-25.5 parts of 3-methoxypropylamine, 8.3-9.7 parts of pentaerythritol phosphate, 11.2-12.9 parts of N, N-dimethylacetamide, 1.4-2.6 parts of sodium hydroxide, 18.8-20 parts of trisodium phosphate, 7.3-8.8 parts of corrosion inhibitor, 5.6-6.4 parts of stripping agent, 3.2-4.1 parts of penetrating agent, 2.5-3.3 parts of surfactant, 8.7-9.6 parts of scale inhibitor, 3.5-4.4 parts of dispersant and 45-58 parts of water.
Further, the corrosion inhibitor is one or more of hexamethylenetetramine, cinnamaldehyde and polyaspartic acid.
Further, the corrosion inhibitor is hexamethylenetetramine, cinnamaldehyde and polyaspartic acid, and the weight ratio of the hexamethylenetetramine: cinnamaldehyde: the ratio of polyaspartic acid to polyaspartic acid is 2:3: 5.
Further, the stripping agent is a mixture of ethylamine, tetrabutylammonium hydroxide and 1-octyl-3-methylimidazole chloride, and the weight ratio of the ethylamine: tetrabutylammonium hydroxide: the ratio of 1-octyl-3-methylimidazole chloride to 1: 6.
Further, the penetrating agent is alkylphenol polyoxyethylene or polyoxyethylene fatty alcohol ether.
Further, the surfactant is: any one of sodium diisooctyl succinate sulfonate, sodium lignin sulfonate and sodium N-methyltaurate.
Further, the scale inhibitor is one or more of polyoxyethylene pyrophosphate, sodium humate and polyepoxysuccinic acid.
Further, the scale inhibitor is polyoxyethylene pyrophosphate, sodium humate and polyepoxysuccinic acid, and the weight ratio of the polyoxyethylene pyrophosphate to the polyepoxy succinate is as follows: sodium humate: the polyepoxysuccinic acid was 2:2: 6.
Further, the dispersing agent is 3-aminopropyl trimethoxy silane or polyvinyl pyrrolidone.
Further, the preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 22-25.5 parts by weight of 3-methoxypropylamine, 8.3-9.7 parts by weight of pentaerythritol phosphate and 15-20 parts by weight of water, placing the mixture in a magnetic stirrer, stirring the mixture for 20-30min at the temperature of 20-25 ℃ and the rotating speed of 400-500 r/min;
2) mixing 11.2-12.9 parts by weight of N, N-dimethylacetamide, 1.4-2.6 parts by weight of sodium hydroxide, 18.8-20 parts by weight of trisodium phosphate and 30-38 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 30-45min at the rotation speed of 300-400r/min at the temperature of 20-25 ℃ to obtain a mixture B;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting the mixture into a reaction kettle, adding 2.5-3.3 parts by weight of surfactant, 8.7-9.6 parts by weight of scale inhibitor and 3.5-4.4 parts by weight of dispersant, controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotation speed of 200-300r/min, and stirring for 2-3h to obtain a mixed solution;
4) adding 7.3-8.8 parts by weight of corrosion inhibitor, 5.6-6.4 parts by weight of stripping agent and 3.2-4.1 parts by weight of penetrating agent into the mixed solution obtained in the step 3), controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotating speed of 300-400r/min, and stirring for 8-10h to obtain a target product;
5) oscillating the target product obtained in the step 4) in a shaking machine for 12-16h, wherein the amplitude is 50mm, the rotating speed is 100-200rpm, and performing suction filtration to obtain the final product.
The invention has the beneficial effects that: the chemical cleaning agent for removing the hard scale of the air preheater is prepared by taking 3-methoxypropylamine, pentaerythritol phosphate, N-dimethylacetamide, trisodium phosphate and the like as main agents and adding a corrosion inhibitor, a scale inhibitor, a stripping agent, a penetrating agent, a surfactant, a dispersing agent and the like, and has the advantages of obvious removing effect, no corrosion to the interior of the air preheater, good biodegradability and the like.
The 3-methoxypropylamine is compounded with pentaerythritol phosphate, so that substances such as ferric oxide, ferrous sulfide, ammonium bisulfate and the like in hard scale can be effectively dissolved. The N, N-dimethylacetamide, trisodium phosphate, sodium hydroxide, 3-methoxypropylamine and pentaerythritol phosphate are matched to dissolve calcium and magnesium compounds in the hard scale and release gas, and the sodium hydroxide adjusts the PH of the cleaning agent, enhances the dissolving capacity of the hard scale and does not corrode an air preheater.
Molecules in corrosion inhibitors such as hexamethylenetetramine, cinnamaldehyde and polyaspartic acid are directionally arranged on the surface of the metal to form a hydrophobic film, and water molecules are isolated from contacting the surface of the metal, so that the corrosion inhibitors have corrosion inhibition and rust prevention effects and good biological decomposition performance.
The stripping agent and the dispersing agent have synergistic effect, and are beneficial to stripping hard scale from the surface of the air preheater. The penetrant chelates metal ions in the hard scale, enhances the dissolving power of the hard scale, and makes the reaction favorable for the scale dissolving direction. The surfactant plays roles of wetting and emulsifying, is beneficial to the contact reaction of the cleaning agent and hard scale, and simultaneously improves the stability of the cleaning agent and enhances the high and low temperature resistance. The scale inhibitors such as polyoxyethylene pyrophosphate, sodium humate, polyepoxysuccinic acid and the like can disperse insoluble inorganic salts in water, prevent or interfere the precipitation and scaling functions of the insoluble inorganic salts on the metal surface, and have excellent shielding, anti-permeability and antirust properties. The dispersant enables the components to have better compatibility, enables the system to be more uniform, and reduces the generation of foam and bubbles in the cleaning process of the aqueous solution of the cleaning agent.
The chemical cleaning agent prepared by organically combining various materials and exerting the synergistic effect of the components has the advantages of high-efficiency and obvious hard scale removing capacity, no corrosion, excellent antirust performance, foaming height of less than 3.5mm, good defoaming performance and excellent high-low temperature stability. The invention is green, environment-friendly and pollution-free, has good biodegradability, and does not corrode the air preheater and peripheral equipment; the hard scale removing effect is obvious, the hard scale can be removed quickly, a protective layer is formed on the surface of the air preheater, the rate of hard scale accumulation again is delayed, the inner wall is prevented from being oxidized and corroded, and the service life of the air preheater is prolonged.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Example one
A chemical cleaning agent for removing hard scale of an air preheater comprises the following components in percentage by weight: 22 parts of 3-methoxypropylamine, 8.3 parts of pentaerythritol phosphate, 11.2 parts of N, N-dimethylacetamide, 1.4 parts of sodium hydroxide, 18.8 parts of trisodium phosphate, 7.3 parts of hexamethylenetetramine, 5.6 parts of a stripping agent, 3.2 parts of alkylphenol polyoxyethylene ether, 2.5 parts of dioctyl sodium sulfosuccinate, 8.7 parts of polyoxyethylene pyrophosphate, 3.5 parts of 3-aminopropyltrimethoxysilane and 45 parts of water.
The stripping agent is a mixture of ethylamine, tetrabutylammonium hydroxide and 1-octyl-3-methylimidazole chloride, and the weight ratio of the ethylamine: tetrabutylammonium hydroxide: the ratio of 1-octyl-3-methylimidazole chloride to 1: 6.
The preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 22 parts by weight of 3-methoxypropylamine, 8.3 parts by weight of pentaerythritol phosphate and 15 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 20min at the temperature of between 20 and 25 ℃ and at the rotating speed of 400r/min to obtain a mixture A;
2) mixing 11.2 parts by weight of N, N-dimethylacetamide, 1.4 parts by weight of sodium hydroxide, 18.8 parts by weight of trisodium phosphate and 30 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 30min at the temperature of 20-25 ℃ and the rotating speed of 300r/min to obtain a mixture B;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting the mixture into a reaction kettle, adding 2.5 parts by weight of diisooctyl succinate sodium sulfonate, 8.7 parts by weight of polyoxyethylene pyrophosphate and 3.5 parts by weight of 3-aminopropyltrimethoxysilane, controlling the temperature of the reaction kettle to be 60-70 ℃, stirring at the rotating speed of 200r/min, and stirring for 2 hours to obtain a mixed solution;
4) adding 7.3 parts by weight of hexamethylenetetramine, 6.4 parts by weight of stripping agent and 3.2-4.1 parts by weight of alkylphenol polyoxyethylene into the mixed solution obtained in the step 3), controlling the temperature of a reaction kettle at 60-70 ℃, stirring at the rotating speed of 300r/min, and stirring for 8 hours to obtain a target product;
5) oscillating the target product obtained in the step 4) in a shaking machine for 12 hours, wherein the amplitude is 50mm, the rotating speed is 100rpm, and performing suction filtration to obtain a final product.
Example two
A chemical cleaning agent for removing hard scale of an air preheater comprises the following components in percentage by weight: 23 parts of 3-methoxypropylamine, 8.5 parts of pentaerythritol phosphate, 11.4 parts of N, N-dimethylacetamide, 1.5 parts of sodium hydroxide, 18.9 parts of trisodium phosphate, 7.5 parts of cinnamaldehyde, 5.8 parts of a stripping agent, 3.4 parts of alkylphenol polyoxyethylene ether, 2.7 parts of sodium lignosulfonate, 8.9 parts of sodium humate, 3.8 parts of 3-aminopropyltrimethoxysilane and 47 parts of water.
The stripping agent is a mixture of ethylamine, tetrabutylammonium hydroxide and 1-octyl-3-methylimidazole chloride, and the weight ratio of the ethylamine: tetrabutylammonium hydroxide: the ratio of 1-octyl-3-methylimidazole chloride to 1: 6.
The preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 23 parts by weight of 3-methoxypropylamine, 8.5 parts by weight of pentaerythritol phosphate and 16 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 22min at the temperature of between 20 and 25 ℃ and at the rotating speed of 400r/min to obtain a mixture A;
2) mixing 11.4 parts by weight of N, N-dimethylacetamide, 1.5 parts by weight of sodium hydroxide, 18.9 parts by weight of trisodium phosphate and 31 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 35min at the temperature of 20-25 ℃ and the rotating speed of 300r/min to obtain a mixture B;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting the mixture into a reaction kettle, adding 2.7 parts by weight of sodium lignosulfonate, 8.9 parts by weight of sodium humate and 3.8 parts by weight of 3-aminopropyltrimethoxysilane, controlling the temperature of the reaction kettle to be 60-70 ℃, stirring at the rotating speed of 250r/min, and stirring for 2 hours to obtain a mixed solution 1;
4) adding 7.5 parts by weight of cinnamaldehyde, 5.8 parts by weight of stripping agent and 3.4 parts by weight of alkylphenol polyoxyethylene into the mixed solution 1 obtained in the step 3), controlling the temperature of a reaction kettle at 60-70 ℃, stirring at the rotating speed of 350r/min, and stirring for 8.5 hours to obtain a target product;
5) oscillating the target product obtained in the step 4) in a shaking machine for 12.5h, wherein the amplitude is 50mm, the rotating speed is 120rpm, and performing suction filtration to obtain a final product.
EXAMPLE III
A chemical cleaning agent for removing hard scale of an air preheater comprises the following components in percentage by weight: 25.2 parts of 3-methoxypropylamine, 9.5 parts of pentaerythritol phosphate, 12.7 parts of N, N-dimethylacetamide, 2.5 parts of sodium hydroxide, 19.8 parts of trisodium phosphate, 8.5 parts of polyaspartic acid, 6.3 parts of a stripping agent, 4 parts of polyoxyethylene fatty alcohol ether, 3.2 parts of N-methyltaurine sodium, 9.5 parts of polyepoxysuccinic acid, 4.2 parts of polyvinylpyrrolidone and 57 parts of water.
The stripping agent is a mixture of ethylamine, tetrabutylammonium hydroxide and 1-octyl-3-methylimidazole chloride, and the weight ratio of the ethylamine: tetrabutylammonium hydroxide: the specific gravity of the chlorinated 1-octyl-3-methylimidazole is 3:1: 6.
The preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 25.2 parts by weight of 3-methoxypropylamine, 9.5 parts by weight of pentaerythritol phosphate and 20 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 20min at the temperature of between 20 and 25 ℃ and at the rotating speed of 400r/min to obtain a mixture A;
2) mixing 12.7 parts by weight of N, N-dimethylacetamide, 2.5 parts by weight of sodium hydroxide, 19.8 parts by weight of trisodium phosphate and 37 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 32min at the temperature of 20-25 ℃ and the rotating speed of 300r/min to obtain a mixture B;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting into a reaction kettle, adding 3.2 parts by weight of N-methyltaurine sodium, 9.5 parts by weight of polyepoxysuccinic acid and 4.2 parts by weight of polyvinylpyrrolidone, controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotation speed of 200/min, and stirring for 2 hours to obtain a mixed solution;
4) adding 8.5 parts by weight of polyaspartic acid, 6.3 parts by weight of stripping agent and 4 parts by weight of polyoxyethylene fatty alcohol ether into the mixed solution obtained in the step 3), controlling the temperature of a reaction kettle at 60-70 ℃, stirring at the rotating speed of 300r/min, and stirring for 8.5 hours to obtain a target product;
5) oscillating the target product obtained in the step 4) in a shaking machine for 12.5h, wherein the amplitude is 50mm, the rotating speed is 100rpm, and performing suction filtration to obtain a final product.
Example four
A chemical cleaning agent for removing the hard scale of the air preheater comprises the same components and the same contents as those in the fifth embodiment.
The preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 25.2 parts by weight of 3-methoxypropylamine, 9.5 parts by weight of pentaerythritol phosphate and 20 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 22min at the temperature of between 20 and 25 ℃ and at the rotating speed of 400r/min to obtain a mixture A;
2) mixing 12.7 parts by weight of N, N-dimethylacetamide, 2.5 parts by weight of sodium hydroxide, 19.8 parts by weight of trisodium phosphate and 37 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 35min at the temperature of 20-25 ℃ and the rotating speed of 300r/min to obtain a mixture B;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting into a reaction kettle, adding 3.2 parts by weight of N-methyltaurine sodium, 9.5 parts by weight of polyepoxysuccinic acid and 4.2 parts by weight of polyvinylpyrrolidone, controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotation speed of 250/min, and stirring for 2 hours to obtain a mixed solution;
4) adding 8.5 parts by weight of polyaspartic acid, 6.3 parts by weight of stripping agent and 4 parts by weight of polyoxyethylene fatty alcohol ether into the mixed solution obtained in the step 3), controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotating speed of 300r/min, and stirring for 8.5 h.
EXAMPLE five
A chemical cleaning agent for removing hard scale of an air preheater comprises the following components in percentage by weight: 24.8 parts of 3-methoxypropylamine, 9 parts of pentaerythritol phosphate, 12.2 parts of N, N-dimethylacetamide, 2.2 parts of sodium hydroxide, 19.5 parts of trisodium phosphate, 8.3 parts of corrosion inhibitor, 6.1 parts of stripping agent, 3.9 parts of alkylphenol polyoxyethylene, 3 parts of diisooctyl succinate sodium sulfonate, 9.2 parts of scale inhibitor, 4.2 parts of 3-aminopropyltrimethoxysilane and 55 parts of water.
The corrosion inhibitor is hexamethylenetetramine, cinnamaldehyde and polyaspartic acid, wherein the weight ratio of hexamethylenetetramine: cinnamaldehyde: the specific gravity of the polyaspartic acid is 2:3: 5.
The stripping agent is a mixture of ethylamine, tetrabutylammonium hydroxide and 1-octyl-3-methylimidazole chloride, and the weight ratio of the ethylamine: tetrabutylammonium hydroxide: the ratio of 1-octyl-3-methylimidazole chloride to 1: 6.
The scale inhibitor is polyoxyethylene pyrophosphate, sodium humate and polyepoxysuccinic acid, and the weight ratio of the polyoxyethylene pyrophosphate to the polyepoxy succinic acid is as follows: sodium humate: the polyepoxysuccinic acid was 2:2: 6.
The preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 24.8 parts by weight of 3-methoxypropylamine, 9 parts by weight of pentaerythritol phosphate and 19 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 30min at the temperature of between 20 and 25 ℃ and at the rotating speed of 450r/min to obtain a mixture A;
2) mixing 12.2 parts by weight of N, N-dimethylacetamide, 2.2 parts by weight of sodium hydroxide, 19.5 parts by weight of trisodium phosphate and 36 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 42min at the temperature of 20-25 ℃ and the rotating speed of 350r/min to obtain a mixture B;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting the mixture into a reaction kettle, adding 3 parts by weight of diisooctyl succinate sodium sulfonate, 9.2 parts by weight of scale inhibitor and 4.2 parts by weight of 3-aminopropyltrimethoxysilane, controlling the temperature of the reaction kettle to be 60-70 ℃, stirring at the rotating speed of 250r/min, and stirring for 3 hours to obtain a mixed solution;
4) adding 8.3 parts by weight of corrosion inhibitor, 6.1 parts by weight of stripping agent and 3.9 parts by weight of alkylphenol polyoxyethylene into the mixed solution obtained in the step 3), controlling the temperature of a reaction kettle at 60-70 ℃, stirring at the rotating speed of 350r/min, and stirring for 9.5 hours to obtain a target product;
5) oscillating the target product obtained in the step 4) in a shaking machine for 16h, wherein the amplitude is 50mm, the rotating speed is 180rpm, and performing suction filtration to obtain a final product.
EXAMPLE six
A chemical cleaning agent for removing hard scale of an air preheater, which comprises the same components and the same contents as the fifth embodiment,
however, unlike the fifth example, the corrosion inhibitor used in this example was hexamethylenetetramine and the scale inhibitor was polyepoxysuccinic acid.
The preparation method of the chemical cleaning agent for removing the hard scale of the air preheater is the same as that of the fifth embodiment.
EXAMPLE seven
A chemical cleaning agent for removing hard scale of an air preheater comprises the following components in percentage by weight: 22.2 parts of 3-methoxypropylamine, 8.1 parts of pentaerythritol phosphate, 11.3 parts of N, N-dimethylacetamide, 1.4 parts of sodium hydroxide, 18.8 parts of trisodium phosphate, 7.4 parts of corrosion inhibitor, 5.6 parts of stripping agent, 3.3 parts of polyoxyethylene fatty alcohol ether, 2.5 parts of sodium lignosulfonate, 8.8 parts of scale inhibitor, 3.5 parts of polyvinylpyrrolidone and 46 parts of water.
The corrosion inhibitor is hexamethylenetetramine, cinnamaldehyde and polyaspartic acid, and the weight ratio of the hexamethylenetetramine: cinnamaldehyde: the ratio of polyaspartic acid to polyaspartic acid is 2:3: 5.
The stripping agent is a mixture of ethylamine, tetrabutylammonium hydroxide and 1-octyl-3-methylimidazole chloride, and the weight ratio of the ethylamine: tetrabutylammonium hydroxide: the ratio of 1-octyl-3-methylimidazole chloride to 1: 6.
The scale inhibitor is polyoxyethylene pyrophosphate, sodium humate and polyepoxysuccinic acid, and the weight ratio of the polyoxyethylene pyrophosphate to the polyepoxy succinic acid is as follows: sodium humate: the polyepoxysuccinic acid was 2:2: 6.
The preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 22.2 parts by weight of 3-methoxypropylamine, 8.1 parts by weight of pentaerythritol phosphate and 15 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 20min at the temperature of between 20 and 25 ℃ and at the rotating speed of 400r/min to obtain a mixture A;
2) mixing 11.3 parts by weight of N, N-dimethylacetamide, 1.4 parts by weight of sodium hydroxide, 18.8 parts by weight of trisodium phosphate and 31 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 35min at the temperature of 20-25 ℃ and the rotating speed of 300r/min to obtain a mixture B;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting the mixture into a reaction kettle, adding 2.5 parts by weight of sodium lignosulfonate, 8.8 parts by weight of scale inhibitor and 3.5 parts by weight of polyvinylpyrrolidone, controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotation speed of 200r/min, and stirring for 2.5 hours to obtain a mixed solution;
4) adding 7.4 parts by weight of corrosion inhibitor, 5.6 parts by weight of stripping agent and 3.3 parts by weight of polyoxyethylene fatty alcohol ether into the mixed solution obtained in the step 3), controlling the temperature of a reaction kettle at 60-70 ℃, stirring at the rotating speed of 300r/min, and stirring for 9 hours to obtain a target product;
5) oscillating the target product obtained in the step 4) in a shaking machine for 13 hours, wherein the amplitude is 50mm, the rotating speed is 100rpm, and performing suction filtration to obtain a final product.
Example eight
A chemical cleaning agent for removing hard scale of an air preheater comprises the following components in percentage by weight: 25.5 parts of 3-methoxypropylamine, 9.7 parts of pentaerythritol phosphate, 12.9 parts of N, N-dimethylacetamide, 2.6 parts of sodium hydroxide, 20 parts of trisodium phosphate, 8.8 parts of corrosion inhibitor, 6.4 parts of stripping agent, 4.1 parts of polyoxyethylene fatty alcohol ether, 3.3 parts of N-methyl sodium taurate, 9.6 parts of scale inhibitor, 4.4 parts of polyvinylpyrrolidone and 58 parts of water.
The corrosion inhibitor is hexamethylenetetramine, cinnamaldehyde and polyaspartic acid, and the weight ratio of the hexamethylenetetramine: cinnamaldehyde: the ratio of polyaspartic acid to polyaspartic acid is 2:3: 5.
The stripping agent is a mixture of ethylamine, tetrabutylammonium hydroxide and 1-octyl-3-methylimidazole chloride, and the weight ratio of the ethylamine: tetrabutylammonium hydroxide: the ratio of 1-octyl-3-methylimidazole chloride to 1: 6.
The scale inhibitor is polyoxyethylene pyrophosphate, sodium humate and polyepoxysuccinic acid, and the weight ratio of the polyoxyethylene pyrophosphate to the polyepoxy succinic acid is as follows: sodium humate: the polyepoxysuccinic acid was 2:2: 6.
The preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 25.5 parts by weight of 3-methoxypropylamine, 9.7 parts by weight of pentaerythritol phosphate and 20 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 30min at the temperature of between 20 and 25 ℃ and at the rotating speed of 500r/min to obtain a mixture A;
2) mixing 12.9 parts by weight of N, N-dimethylacetamide, 2.6 parts by weight of sodium hydroxide, 20 parts by weight of trisodium phosphate and 38 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 45min at the temperature of 20-25 ℃ and the rotating speed of 400 r/min;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting the mixture into a reaction kettle, adding 3.3 parts by weight of N-methyltaurine sodium, 9.6 parts by weight of scale inhibitor and 4.4 parts by weight of polyvinylpyrrolidone, controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotating speed of 300r/min, and stirring for 3 hours to obtain a mixed solution;
4) adding 8.8 parts by weight of corrosion inhibitor, 6.4 parts by weight of stripping agent and 4.1 parts by weight of polyoxyethylene fatty alcohol ether into the mixed solution obtained in the step 3), controlling the temperature of a reaction kettle at 60-70 ℃, stirring at the rotating speed of 400r/min, and stirring for 10 hours to obtain a target product;
5) oscillating the target product obtained in the step 4) in a shaking machine for 16h, wherein the amplitude is 50mm, the rotating speed is 200rpm, and performing suction filtration to obtain a final product.
Comparative example 1
A chemical cleaning agent for removing hard scale of an air preheater comprises the following components in percentage by weight: 23 parts of 3-methoxypropylamine, 8.5 parts of pentaerythritol phosphate, 1.5 parts of sodium hydroxide, 18.9 parts of trisodium phosphate, 7.5 parts of cinnamaldehyde, 5.8 parts of a stripping agent, 3.4 parts of alkylphenol polyoxyethylene, 8.9 parts of sodium humate, 3.8 parts of 3-aminopropyltrimethoxysilane and 47 parts of water.
The stripping agent is a mixture of ethylamine, tetrabutylammonium hydroxide and 1-octyl-3-methylimidazole chloride, and the weight ratio of the ethylamine: tetrabutylammonium hydroxide: the ratio of 1-octyl-3-methylimidazole chloride to 1: 6.
The preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 23 parts by weight of 3-methoxypropylamine, 8.5 parts by weight of pentaerythritol phosphate and 16 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 22min at the temperature of between 20 and 25 ℃ and at the rotating speed of 400r/min to obtain a mixture A;
2) mixing 1.5 parts by weight of sodium hydroxide, 18.9 parts by weight of trisodium phosphate and 31 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 35min at the temperature of between 20 and 25 ℃ and at the rotating speed of 300r/min to obtain a mixture B;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting the mixture into a reaction kettle, adding 8.9 parts by weight of sodium humate and 3.8 parts by weight of 3-aminopropyltrimethoxysilane, controlling the temperature of the reaction kettle to be 60-70 ℃, stirring at the rotating speed of 250r/min, and stirring for 2 hours to obtain a mixed solution;
4) adding 7.5 parts by weight of cinnamaldehyde, 5.8 parts by weight of stripping agent and 3.4 parts by weight of alkylphenol polyoxyethylene into the mixed solution obtained in the step 3), controlling the temperature of a reaction kettle at 60-70 ℃, stirring at the rotating speed of 350r/min, and stirring for 8.5 hours to obtain a target product;
5) oscillating the target product obtained in the step 4) in a shaking machine for 12.5h, wherein the amplitude is 50mm, the rotating speed is 120rpm, and performing suction filtration to obtain a final product.
Comparative example No. two
A chemical cleaning agent for removing hard scale of an air preheater comprises the following components in percentage by weight: 25.2 parts of 3-methoxypropylamine, 9.5 parts of pentaerythritol phosphate, 12.7 parts of N, N-dimethylacetamide, 2.5 parts of sodium hydroxide, 19.8 parts of trisodium phosphate, 6.3 parts of a stripping agent, 4 parts of polyoxyethylene fatty alcohol ether, 3.2 parts of sodium N-methyltaurate, 9.5 parts of polyepoxysuccinic acid, 4.2 parts of polyvinylpyrrolidone and 57 parts of water.
The stripping agent is a mixture of ethylamine, tetrabutylammonium hydroxide and 1-octyl-3-methylimidazole chloride, and the weight ratio of the ethylamine: tetrabutylammonium hydroxide: the ratio of 1-octyl-3-methylimidazole chloride to 1: 6.
The preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 25.2 parts by weight of 3-methoxypropylamine, 9.5 parts by weight of pentaerythritol phosphate and 20 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 20min at the temperature of between 20 and 25 ℃ and at the rotating speed of 400r/min to obtain a mixture A;
2) mixing 12.7 parts by weight of N, N-dimethylacetamide, 2.5 parts by weight of sodium hydroxide, 19.8 parts by weight of trisodium phosphate and 37 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 32min at the temperature of 20-25 ℃ and the rotating speed of 300r/min to obtain a mixture B;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting into a reaction kettle, adding 3.2 parts by weight of N-methyltaurine sodium, 9.5 parts by weight of polyepoxysuccinic acid and 4.2 parts by weight of polyvinylpyrrolidone, controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotation speed of 200/min, and stirring for 2 hours to obtain a mixed solution;
4) adding 6.3 parts by weight of stripping agent and 4 parts by weight of polyoxyethylene fatty alcohol ether into the mixed solution obtained in the step 3), controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotating speed of 300r/min, and stirring for 8.5h to obtain a target product;
5) oscillating the target product obtained in the step 4) in a shaking machine for 12.5h, wherein the amplitude is 50mm, the rotating speed is 100rpm, and performing suction filtration to obtain a final product.
Comparative example No. three
A chemical cleaning agent for removing hard scale of an air preheater comprises the following components in percentage by weight: 24.8 parts of 3-methoxypropylamine, 9 parts of pentaerythritol phosphate, 12.2 parts of N, N-dimethylacetamide, 2.2 parts of sodium hydroxide, 19.5 parts of trisodium phosphate, 8.3 parts of corrosion inhibitor, 3.9 parts of alkylphenol polyoxyethylene, 3 parts of diisooctyl succinate sodium sulfonate, 9.2 parts of scale inhibitor, 4.2 parts of 3-aminopropyltrimethoxysilane and 55 parts of water.
The corrosion inhibitor is hexamethylenetetramine, cinnamaldehyde and polyaspartic acid, and the weight ratio of the hexamethylenetetramine: cinnamaldehyde: the ratio of polyaspartic acid to polyaspartic acid is 2:3: 5.
The scale inhibitor is polyoxyethylene pyrophosphate, sodium humate and polyepoxysuccinic acid, and the weight ratio of the polyoxyethylene pyrophosphate to the polyepoxy succinic acid is as follows: sodium humate: the polyepoxysuccinic acid was 2:2: 6.
The preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 24.8 parts by weight of 3-methoxypropylamine, 9 parts by weight of pentaerythritol phosphate and 19 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 30min at the temperature of between 20 and 25 ℃ and at the rotating speed of 450r/min to obtain a mixture A;
2) mixing 12.2 parts by weight of N, N-dimethylacetamide, 2.2 parts by weight of sodium hydroxide, 19.5 parts by weight of trisodium phosphate and 36 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 42min at the temperature of 20-25 ℃ and the rotating speed of 350r/min to obtain a mixture B;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting the mixture into a reaction kettle, adding 3 parts by weight of diisooctyl succinate sodium sulfonate, 9.2 parts by weight of scale inhibitor and 4.2 parts by weight of 3-aminopropyltrimethoxysilane, controlling the temperature of the reaction kettle to be 60-70 ℃, stirring at the rotating speed of 250r/min, and stirring for 3 hours to obtain a mixed solution;
4) adding 8.3 parts by weight of corrosion inhibitor and 3.9 parts by weight of alkylphenol polyoxyethylene ether into the mixed solution obtained in the step 3), controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotating speed of 350r/min, and stirring for 9.5 hours to obtain a target product;
5) oscillating the target product obtained in the step 4) in a shaking machine for 16h, wherein the amplitude is 50mm, the rotating speed is 180rpm, and performing suction filtration to obtain a final product.
Comparative example No. four
A chemical cleaning agent for removing hard scale of an air preheater comprises the following components in percentage by weight: 22.2 parts of 3-methoxypropylamine, 8.1 parts of pentaerythritol phosphate, 11.3 parts of N, N-dimethylacetamide, 1.4 parts of sodium hydroxide, 18.8 parts of trisodium phosphate, 7.4 parts of corrosion inhibitor, 5.6 parts of stripping agent, 2.5 parts of sodium lignosulfonate, 8.8 parts of scale inhibitor and 46 parts of water.
The corrosion inhibitor is hexamethylenetetramine, cinnamaldehyde and polyaspartic acid, and the weight ratio of the hexamethylenetetramine: cinnamaldehyde: the ratio of polyaspartic acid to polyaspartic acid is 2:3: 5.
The stripping agent is a mixture of ethylamine, tetrabutylammonium hydroxide and 1-octyl-3-methylimidazole chloride, and the weight ratio of the ethylamine: tetrabutylammonium hydroxide: the ratio of 1-octyl-3-methylimidazole chloride to 1: 6.
The scale inhibitor is polyoxyethylene pyrophosphate, sodium humate and polyepoxysuccinic acid, and the weight ratio of the polyoxyethylene pyrophosphate to the polyepoxy succinic acid is as follows: sodium humate: the polyepoxysuccinic acid was 2:2: 6.
The preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 22.2 parts by weight of 3-methoxypropylamine, 8.1 parts by weight of pentaerythritol phosphate and 15 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 20min at the temperature of between 20 and 25 ℃ and at the rotating speed of 400r/min to obtain a mixture A;
2) mixing 11.3 parts by weight of N, N-dimethylacetamide, 1.4 parts by weight of sodium hydroxide, 18.8 parts by weight of trisodium phosphate and 31 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 35min at the temperature of 20-25 ℃ and the rotating speed of 300r/min to obtain a mixture B;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting the mixture into a reaction kettle, adding 2.5 parts by weight of sodium lignosulfonate and 8.8 parts by weight of scale inhibitor, controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotating speed of 200r/min, and stirring for 2.5 hours to obtain a mixed solution;
4) adding 7.4 parts by weight of corrosion inhibitor and 5.6 parts by weight of stripping agent into the mixed solution obtained in the step 3), controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotating speed of 300r/min, and stirring for 9 hours to obtain a target product;
5) oscillating the target product obtained in the step 4) in a shaking machine for 13 hours, wherein the amplitude is 50mm, the rotating speed is 100rpm, and performing suction filtration to obtain a final product.
Comparative example five
A chemical cleaning agent for removing hard scale of an air preheater comprises the following components in percentage by weight: 25.5 parts of 3-methoxypropylamine, 9.7 parts of pentaerythritol phosphate, 12.9 parts of N, N-dimethylacetamide, 2.6 parts of sodium hydroxide, 20 parts of trisodium phosphate, 8.8 parts of corrosion inhibitor, 6.4 parts of stripping agent, 4.1 parts of polyoxyethylene fatty alcohol ether, 3.3 parts of N-methyl sodium taurate, 4.4 parts of polyvinylpyrrolidone and 58 parts of water.
The corrosion inhibitor is hexamethylenetetramine, cinnamaldehyde and polyaspartic acid, and the weight ratio of the hexamethylenetetramine: cinnamaldehyde: the specific gravity of the polyaspartic acid is 2:3: 5.
The stripping agent is a mixture of ethylamine, tetrabutylammonium hydroxide and 1-octyl-3-methylimidazole chloride, and the weight ratio of the ethylamine: tetrabutylammonium hydroxide: the specific gravity of the chlorinated 1-octyl-3-methylimidazole is 3:1: 6.
The preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 25.5 parts by weight of 3-methoxypropylamine, 9.7 parts by weight of pentaerythritol phosphate and 20 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 30min at the temperature of between 20 and 25 ℃ and at the rotating speed of 500r/min to obtain a mixture A;
2) mixing 12.9 parts by weight of N, N-dimethylacetamide, 2.6 parts by weight of sodium hydroxide, 20 parts by weight of trisodium phosphate and 38 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 45min at the temperature of 20-25 ℃ and the rotating speed of 400 r/min;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting the mixture into a reaction kettle, adding 3.3 parts by weight of N-methyltaurine sodium and 4.4 parts by weight of polyvinylpyrrolidone, controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotating speed of 300r/min, and stirring for 3 hours to obtain a mixed solution;
4) adding 8.8 parts by weight of corrosion inhibitor, 6.4 parts by weight of stripping agent and 4.1 parts by weight of polyoxyethylene fatty alcohol ether into the mixed solution obtained in the step 3), controlling the temperature of a reaction kettle at 60-70 ℃, stirring at the rotating speed of 400r/min, and stirring for 10 hours to obtain a target product;
5) oscillating the target product obtained in the step 4) in a shaking machine for 16h, wherein the amplitude is 50mm, the rotating speed is 200rpm, and performing suction filtration to obtain a final product.
And (3) performance testing:
1) hard scale removal test
The same mass of scale was taken, weighed and recorded as W1. Placing the hard scale in a beaker containing 100mL of 3% cleaning agent, soaking for 10min, and then oscillating at constant speed for 10 min. And (5) observing whether the hard scale is completely dissolved, if not, taking out the hard scale, drying and weighing, and recording as W2. The removal rate of the cleaning agent was determined by the following formula (1):
removal rate = (W)1-W2)/W1×100% （1）
In the formula: w1-mass of soaked scale, g;
W2mass of soaked hard scale, g.
2) Corrosion rate test
The corrosion test adopts a full immersion method, wherein the metal test piece is fully immersed in a cleaning agent water solution with the concentration of 40 percent. The corrosion performance of the cleaning agent on metal is evaluated by the weight loss of the metal test piece and the change of the surface color. The same test pieces were weighed on analytical balances to obtain P1. And then placed in test tubes, respectively. The cleaning agent is preheated to 40 ℃ in a constant temperature drying box, poured into a test tube, and covered to be kept at the constant temperature of 45 ℃ for 6 hours, and the liquid level is about 10mm higher than the top end of the test piece. After the experiment period, the test piece is taken out, rinsed by distilled water, washed by absolute ethyl alcohol for 2 times and immediately dried by hot air. The appearance was checked by comparison with a freshly ground and cleaned coupon, which was again weighed P2. The corrosion rate of the cleaning agent was determined by the following formula (2):
corrosion rate = (P)1-P2)/P1×100% （2）
In the formula: p1-mass of soaked coupon, g;
P2mass of soaked coupon, g.
3) Test for rust resistance
Taking polished and cleaned metal test pieces, and dividing each test piece into 4 grids. Dipping the cleaning agent by a round-head glass rod, accurately dripping into 4 grids with 1 drop in each grid, and when dripping, the diameter of each drop is about 4-5 mm. Placing the test piece on a dryer clapboard with water at the lower end, covering the clapboard, and placing the test piece at the constant temperature of 35 +/-2 ℃. After the experimental period is over 30h, the test piece is taken out for observation, and whether the dripping area of the inspection liquid is rusted or not is checked.
4) Defoaming Performance test
Pouring a cleaning agent solution with the concentration of 3% into the measuring cylinder to enable the liquid level to be 70mm away from the lower end face of the cylinder plug, covering the cylinder plug, placing the cylinder plug in a constant-temperature drying box at the temperature of 30 ℃ for 10min, taking out the cylinder plug, immediately shaking up and down for 1min, wherein the distance of the shaking up and down is about 0.33m, the frequency is about 100 times/min, opening the cylinder plug after the shaking is finished, standing the measuring cylinder containing the test solution for 10min, observing the disappearance condition of foam, and recording the height of residual foam.
5) High and Low temperature stability test
High temperature experiment: 50mL of chemical cleaning agent is placed in a 50mL measuring cylinder with a plug, and the measuring cylinder with the plug is placed in a water bath at 90 ℃ so that the water surface does not exceed the scale of 30mL of the cylinder. After 8h the cylinder was removed and allowed to cool to room temperature before inspection.
Low-temperature experiment: 50mL of chemical cleaning agent is put into a 50mL measuring cylinder with a plug, kept in a low-temperature (-20 ℃) box for 2 hours, the measuring cylinder is taken out, and after the test solution is returned to the room temperature and kept for 1 hour, the test solution is poured for 5 times for observation.
The results of the test analyses of examples one to eight and comparative examples one to five are shown in table 1:
table 1 results of performance test of chemical cleaning agents of examples and comparative examples
Hard scale removal rate (%) Corrosion ratio (%) Rust protection (rust zone) Foam height (mm) High temperature stability Stability at Low temperature
Example one 100 0 0 3.4 Transparent and free of precipitate Transparent and free of precipitate
Example two 100 0 0 3.2 Transparent and free of precipitate Transparent and free of precipitate
EXAMPLE III 100 0 0 3.2 Transparent and free of precipitate Transparent and free of precipitate
Example four 100 0 0 3.4 Transparent and free of precipitate Transparent and free of precipitate
EXAMPLE five 100 0 0 2.6 Transparent and free of precipitate Transparent and free of precipitate
EXAMPLE six 100 0 0 3.0 Transparent and free of precipitate Transparent and free of precipitate
EXAMPLE seven 100 0 0 2.8 Transparent and free of precipitate Transparent and free of precipitate
Example eight 100 0 0 2.9 Transparent and free of precipitate Transparent and free of precipitate
Comparative example 1 94.2 6.3 2 4.3 Turbidity with precipitates Turbidity with precipitates
Comparative example No. two 95.3 6.7 1 4.0 Turbidity with precipitates Turbidity with precipitates
Comparative example No. three 94.7 5.6 1 4.2 Turbidity with precipitates Turbidity with precipitates
Comparative example No. four 95.6 5.5 1 4.2 Turbidity with precipitates Turbidity with precipitates
Comparative example five 95.8 5.3 2 4.1 Turbidity with precipitates Turbidity with precipitates
As can be seen from table 1: 1) examples one to eight all show a good combination of properties: the high-efficiency and obvious hard scale removing capability is realized, the corrosion is avoided, the antirust performance is excellent, the foaming height is below 3.5mm, the defoaming performance is good, and the high-temperature and low-temperature stability is excellent. 2) In the first to fourth embodiments and the sixth embodiment, both the corrosion inhibitor and the scale inhibitor are single substances, in the fifth, seventh and eighth embodiments, the corrosion inhibitor and the scale inhibitor are a mixture of three substances, and the combination property of the chemical cleaning agent in the fifth, seventh and eighth embodiments is better than that in the first to fourth embodiments and the sixth embodiment; compared with the three phases of the example, the composition and the content of the substances are the same, the technical parameters of the preparation method are different, and the performance of the three phase of the example is better than that of the four phase of the example. 3) Comparative example one compared to the example two, N-dimethylacetamide and surfactant were absent; the second comparative example is in the absence of corrosion inhibitors compared to the third example; the third comparative example is absent of a stripper as compared to the fifth example; comparative example four compared to example seven, lacks a penetrant and a dispersant; compared with the fifth example, the fifth example lacks scale inhibition; the chemical cleaners of comparative examples one to five were inferior in performance to examples one to eight. The raw materials supplement each other, and the performance of the chemical cleaning agent is obviously reduced if any one of the raw materials is lacked.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims (7)

1. A chemical cleaning agent for removing hard scale of an air preheater is characterized in that: the composition is prepared from the following components in parts by weight: 22-25.5 parts of 3-methoxypropylamine, 8.3-9.7 parts of pentaerythritol phosphate, 11.2-12.9 parts of N, N-dimethylacetamide, 1.4-2.6 parts of sodium hydroxide, 18.8-20 parts of trisodium phosphate, 7.3-8.8 parts of corrosion inhibitor, 5.6-6.4 parts of stripping agent, 3.2-4.1 parts of penetrating agent, 2.5-3.3 parts of surfactant, 8.7-9.6 parts of scale inhibitor, 3.5-4.4 parts of dispersant and 45-58 parts of water; the dispersing agent is 3-aminopropyl trimethoxy silane or polyvinyl pyrrolidone; the surfactant is: any one of sodium diisooctyl succinate sulfonate, sodium lignin sulfonate and sodium N-methyltaurate;
the preparation method of the chemical cleaning agent for removing the hard scale of the air preheater comprises the following steps:
1) mixing 22-25.5 parts by weight of 3-methoxypropylamine, 8.3-9.7 parts by weight of pentaerythritol phosphate and 15-20 parts by weight of water, placing the mixture in a magnetic stirrer, stirring the mixture for 20-30min at the temperature of 20-25 ℃ and the rotating speed of 400-500 r/min;
2) mixing 11.2-12.9 parts by weight of N, N-dimethylacetamide, 1.4-2.6 parts by weight of sodium hydroxide, 18.8-20 parts by weight of trisodium phosphate and 30-38 parts by weight of water, placing the mixture in a magnetic stirrer, and stirring the mixture for 30-45min at the rotation speed of 300-400r/min at the temperature of 20-25 ℃ to obtain a mixture B;
3) mixing the mixture A obtained in the step 1) and the mixture B obtained in the step 2), putting the mixture into a reaction kettle, adding 2.5-3.3 parts by weight of surfactant, 8.7-9.6 parts by weight of scale inhibitor and 3.5-4.4 parts by weight of dispersant, controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotation speed of 200-300r/min, and stirring for 2-3h to obtain a mixed solution;
4) adding 7.3-8.8 parts by weight of corrosion inhibitor, 5.6-6.4 parts by weight of stripping agent and 3.2-4.1 parts by weight of penetrating agent into the mixed solution obtained in the step 3), controlling the temperature of the reaction kettle at 60-70 ℃, stirring at the rotating speed of 300-400r/min, and stirring for 8-10h to obtain a target product;
5) oscillating the target product obtained in the step 4) in a shaking machine for 12-16h, wherein the amplitude is 50mm, the rotating speed is 100-200rpm, and performing suction filtration to obtain the final product.
2. A chemical cleaning agent for removing the hard scale of the air preheater as recited in claim 1, wherein: the corrosion inhibitor is one or more of hexamethylenetetramine, cinnamaldehyde and polyaspartic acid.
3. A chemical cleaning agent for removing the hard scale of the air preheater as recited in claim 2, wherein: the corrosion inhibitor is hexamethylenetetramine, cinnamaldehyde and polyaspartic acid, and the weight ratio of the hexamethylenetetramine: cinnamaldehyde: the ratio of polyaspartic acid to polyaspartic acid is 2:3: 5.
4. A chemical cleaning agent for removing the hard scale of the air preheater as recited in claim 1, wherein: the stripping agent is a mixture of ethylamine, tetrabutylammonium hydroxide and 1-octyl-3-methylimidazole chloride, and the weight ratio of the ethylamine: tetrabutylammonium hydroxide: the ratio of 1-octyl-3-methylimidazole chloride to 1: 6.
5. A chemical cleaning agent for removing the hard scale of the air preheater as recited in claim 1, wherein: the penetrating agent is alkylphenol polyoxyethylene or polyoxyethylene fatty alcohol ether.
6. A chemical cleaning agent for removing the hard scale of the air preheater as recited in claim 1, wherein: the scale inhibitor is one or more of polyoxyethylene pyrophosphate, sodium humate and polyepoxysuccinic acid.
7. A chemical cleaning agent for removing the hard scale of the air preheater as recited in claim 6, wherein: the scale inhibitor is polyoxyethylene pyrophosphate, sodium humate and polyepoxysuccinic acid, and the weight ratio of the polyoxyethylene pyrophosphate to the polyepoxy succinic acid is as follows: sodium humate: the polyepoxysuccinic acid was 2:2: 6.
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