CN110257179B - Chemical cleaning agent composition and preparation method and application thereof - Google Patents
Chemical cleaning agent composition and preparation method and application thereof Download PDFInfo
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- CN110257179B CN110257179B CN201910536698.1A CN201910536698A CN110257179B CN 110257179 B CN110257179 B CN 110257179B CN 201910536698 A CN201910536698 A CN 201910536698A CN 110257179 B CN110257179 B CN 110257179B
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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
- C11D1/72—Ethers of polyoxyalkylene glycols
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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
- 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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- 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
- C11D3/20—Organic compounds containing oxygen
- C11D3/2003—Alcohols; Phenols
- C11D3/2041—Dihydric alcohols
- C11D3/2044—Dihydric alcohols linear
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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
- 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
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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
- 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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- 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
- C11D3/37—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
- C11D3/3773—(Co)polymerised monomers containing nitrogen, e.g. carbonamides, nitriles or amines in liquid compositions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Detergent Compositions (AREA)
Abstract
The invention discloses a chemical cleaning agent composition which is prepared from the following components in parts by weight: 5-10 parts of diethanolamine, 3-5 parts of polyisobutylene polysuccinimide, 3-5 parts of sodium hydroxide, 1-2 parts of surfactant, 0.1-0.3 part of benzotriazole, 100 parts of ethylene glycol and 150 parts of water. The invention also provides a preparation method and application of the chemical cleaning agent composition. The invention combines various components to prepare the environment-friendly chemical cleaning agent composition, achieves the balance among various performances by controlling the types and the quantity of the additives, does not simply select the corresponding additives aiming at a certain performance, and avoids the negative influence generated among the additives on the selection of the types and the types as much as possible, thereby obtaining the chemical cleaning agent composition with better performance. After the chemical cleaning agent composition disclosed by the invention is used for treating the ash and scale in the air preheater, the scale removal rate reaches 100% after 10 hours.
Description
Technical Field
The invention belongs to the technical field of cleaning agents, and particularly relates to a chemical cleaning agent composition, and a preparation method and application thereof.
Background
The air preheater is an important auxiliary machine of a boiler of a thermal power plant, and is generally a heat exchange device for heating air required by combustion by using the heat of flue gas. The air preheater recovers the heat of the flue gas, reduces the temperature of the flue gas, improves the initial temperature of the fuel and the air because the air is preheated, strengthens the processes of the fuel and the combustion, reduces the incomplete loss of the fuel and improves the thermal efficiency of the boiler. Meanwhile, the air preheating can also improve the temperature of the flue gas in the hearth and enhance the radiation heat transfer in the furnace. Air preheaters have become an important component of modern boilers.
The problem of ash blockage of the air preheater commonly exists in power plants all over the country, and although the original design of a boiler is provided with ash blowing and water washing devices, the ash blockage is more serious because the ash scale of the air preheater cannot be effectively removed, and the damp ash scale is burnt into bricks when the air preheater is ignited again. Due to ash blockage of the air preheater, the exhaust smoke temperature of a boiler rises, the hot air temperature drops, the resistance of an air and smoke system rises, and the pressure difference between the two sides of the air supply positive pressure side and the air suction negative pressure side increases, so that the air leakage rate of the air preheater is increased, in severe cases, a suction fan is fully opened without adjusting capacity, the negative pressure of a hearth is difficult to maintain, and the investment of a combustion automatic device is influenced. Therefore, the effective cleaning of the air preheater is a need for safe, energy-saving, and civilized production.
The problem of ash blockage is generally solved by adopting a soot blower or a high-pressure water cleaning device in the prior art, but floating ash can only be removed by adopting the non-methods, the cleaning effect on long-term stubborn and adhered ash scales such as ammonium bisulfate with stronger viscosity is not obvious, and chemical cleaning agents are also adopted to clean the ash scales in the prior art, but the chemical cleaning agents are generally suitable for cleaning under the normal temperature environment and cannot be used for high temperature, so that the air preheater chemical cleaning agent needs to be shut down and cooled when in use, the cleaning time is longer, and the normal work of a power plant can be influenced, so that the chemical cleaning agent for the air preheater is very necessary to be developed and is suitable for being used under.
Disclosure of Invention
The invention provides a chemical cleaning agent composition and a preparation method and application thereof, and solves the problem that the chemical cleaning agent for an air preheater in the prior art cannot be applied to a high-temperature environment.
The invention aims to provide a chemical cleaning agent composition, which is prepared from the following components in parts by weight: 5-10 parts of diethanolamine, 3-5 parts of polyisobutylene polysuccinimide, 3-5 parts of sodium hydroxide, 1-2 parts of surfactant, 0.1-0.3 part of benzotriazole, 100 parts of ethylene glycol and 150 parts of water.
Preferably, the chemical cleaning agent composition is prepared from the following components in parts by weight: 5 parts of diethanolamine, 3 parts of polyisobutylene succinimide, 4 parts of sodium hydroxide, 1 part of surfactant, 0.2 part of benzotriazole, 120 parts of ethylene glycol and 10 parts of water.
Preferably, the surfactant is polyethylene glycol 400.
The second purpose of the invention is to provide a preparation method of the chemical cleaning agent composition, which comprises the following steps:
s1, weighing 5-10 parts of diethanolamine, 3-5 parts of polyisobutylene succinimide, 3-5 parts of sodium hydroxide, 1-2 parts of surfactant, 0.1-0.3 part of benzotriazole, 150 parts of ethylene glycol and 10-15 parts of water according to parts by weight;
s2, dissolving the sodium hydroxide weighed in the S1 into the water weighed in the S1 to obtain a sodium hydroxide solution;
s3, uniformly mixing the diethanolamine and the ethylene glycol weighed in the S1 and the sodium hydroxide solution obtained in the S2, and then carrying out magnetization treatment to obtain a magnetized solution;
and S4, uniformly mixing the polyisobutylene succinimide weighed in the S1, the surfactant, the benzotriazole and the magnetized liquid obtained in the S3 to obtain the chemical cleaning agent composition.
Preferably, the conditions of the magnetization processing in S3 are: magnetizing at magnetic field intensity of 2500-.
Preferably, the specific operating conditions of S4 are: and (3) stirring the polyisobutene polysuccinimide weighed in the step (S1), the surfactant, the benzotriazole and the magnetized solution obtained in the step (S3) at the stirring speed of 2000r/min at 80 ℃ for 30min, then cooling to 50 ℃, stirring for 30min, and ultrasonically mixing for 20min after stirring to obtain the chemical cleaning agent composition.
The third purpose of the invention is to provide the application of the chemical cleaning agent composition in the descaling of the air preheater.
Compared with the prior art, the invention has the beneficial effects that:
the chemical cleaning agent composition disclosed by the invention has the advantages that a layer of ash scale layer can be formed on an iron heat storage element of the air preheater in the using process, the main component of the ash scale is ammonium bisulfate hard scale, diethanolamine is added, the diethanolamine can wet and soak the ash scale to soften the ash scale, the wetting effect can be further improved under the condition that polyisobutylene succinimide and diethanolamine are used in a matched manner, the softened ash scale is in a loose state and cannot be further deposited, and the scale which is adsorbed on the surface of the air preheater can be washed and dispersed in the cleaning agent to keep the surface of the air preheater clean; the polyisobutylene succinimide is beneficial to promoting the wetting property of diethanol amine, has excellent high-temperature dispersibility and high-order stability, and can ensure that the chemical cleaning agent has better cleaning and dispersing effects at high temperature; benzotriazole has stronger corrosion resistance; reacting sodium hydroxide with ammonium bisulfate to generate soluble sodium sulfate and ammonia gas, thereby decomposing the hard scale of the ammonium bisulfate; the surfactant can obviously reduce the surface tension of an oil-gas interface, so that the whole system is uniform and does not delaminate; the boiling point of the solution obtained by mixing the ethylene glycol and the water is high and can not be boiled and volatilized at about 140-150 ℃, and after the diethanol amine is added, the boiling point can be further improved to about 160 ℃ under the condition of magnetization treatment, so that the prepared cleaning agent can be used in high-temperature occasions, and in addition, the polyisobutylene polysuccinimide is also a high-temperature resistant substance.
The invention combines various components to prepare the environment-friendly chemical cleaning agent composition, achieves the balance among various performances by controlling the types and the quantity of the additives, does not simply select the corresponding additives aiming at a certain performance, and avoids the negative influence generated among the additives on the selection of the types and the types as much as possible, thereby obtaining the chemical cleaning agent composition with better performance. After the chemical cleaning agent composition disclosed by the invention is used for treating the ash scale in the air preheater, the descaling rate after 10 hours reaches 100%, and the cleaning period is prolonged to 2.5 years to 3 years.
Detailed Description
In order to make the technical solutions of the present invention better understood and enable those skilled in the art to practice the present invention, the following embodiments are further described, but the present invention is not limited to the following embodiments.
Example 1
A chemical cleaning agent composition is prepared from the following components in parts by weight: 5 parts of diethanolamine, 3 parts of polyisobutylene succinimide, 4 parts of sodium hydroxide, 4001 parts of polyethylene glycol, 0.2 part of benzotriazole, 120 parts of ethylene glycol and 10 parts of water.
The preparation method comprises the following specific steps:
s1, weighing 5 parts of diethanolamine, 3 parts of polyisobutylene succinimide, 4 parts of sodium hydroxide, 4001 parts of polyethylene glycol, 0.2 part of benzotriazole, 120 parts of ethylene glycol and 10 parts of water according to parts by weight;
s2, dissolving the sodium hydroxide weighed in the S1 into the water weighed in the S1 to obtain a sodium hydroxide solution;
s3, uniformly mixing the diethanolamine, the ethylene glycol weighed in the S1 and the sodium hydroxide solution obtained in the S2, and then carrying out magnetization treatment, wherein the magnetization treatment conditions are as follows: magnetizing at magnetic field strength of 2500Gs and magnetizing speed of 0.8m/s at 40 deg.C for 30min to obtain magnetized solution;
and S4, stirring the magnetized solution obtained from the polyisobutylene succinimide, the polyethylene glycol 400, the benzotriazole and the S3 weighed in the S1 at a stirring speed of 2000r/min at 80 ℃ for 30min, then cooling to 50 ℃, stirring for 30min, and ultrasonically mixing for 20min after stirring to obtain the chemical cleaning agent composition.
Example 2
A chemical cleaning agent composition is prepared from the following components in parts by weight: 10 parts of diethanolamine, 4 parts of polyisobutylene succinimide, 3 parts of sodium hydroxide, 4001.5 parts of polyethylene glycol, 0.1 part of benzotriazole, 100 parts of ethylene glycol and 10-12 parts of water.
The preparation method comprises the following specific steps:
s1, weighing 10 parts of diethanolamine, 4 parts of polyisobutylene succinimide, 3 parts of sodium hydroxide, 4001.5 parts of polyethylene glycol, 0.1 part of benzotriazole, 100 parts of ethylene glycol and 10-12 parts of water according to parts by weight;
s2, dissolving the sodium hydroxide weighed in the S1 into the water weighed in the S1 to obtain a sodium hydroxide solution;
s3, uniformly mixing the diethanolamine, the ethylene glycol weighed in the S1 and the sodium hydroxide solution obtained in the S2, and then carrying out magnetization treatment, wherein the magnetization treatment conditions are as follows: magnetizing at magnetic field intensity of 3000Gs, magnetizing speed of 1.0m/s and temperature of 30 deg.C for 40min to obtain magnetizing solution;
and S4, stirring the magnetized solution obtained from the polyisobutylene succinimide, the polyethylene glycol 400, the benzotriazole and the S3 weighed in the S1 at a stirring speed of 2000r/min at 80 ℃ for 30min, then cooling to 50 ℃, stirring for 30min, and ultrasonically mixing for 20min after stirring to obtain the chemical cleaning agent composition.
Example 3
A chemical cleaning agent composition is prepared from the following components in parts by weight: 8 parts of diethanolamine, 3 parts of polyisobutylene succinimide, 5 parts of sodium hydroxide, 4002 parts of polyethylene glycol, 0.3 part of benzotriazole, 150 parts of ethylene glycol and 15 parts of water.
The preparation method comprises the following specific steps:
s1, weighing 8 parts of diethanolamine, 3 parts of polyisobutylene succinimide, 5 parts of sodium hydroxide, 4002 parts of polyethylene glycol, 0.3 part of benzotriazole, 150 parts of ethylene glycol and 15 parts of water according to parts by weight;
s2, dissolving the sodium hydroxide weighed in the S1 into the water weighed in the S1 to obtain a sodium hydroxide solution;
s3, uniformly mixing the diethanolamine, the ethylene glycol weighed in the S1 and the sodium hydroxide solution obtained in the S2, and then carrying out magnetization treatment, wherein the magnetization treatment conditions are as follows: magnetizing at magnetic field strength of 2500Gs and magnetizing speed of 1.2m/s at 20 deg.C for 60min to obtain magnetized solution;
s4, stirring the magnetic liquid obtained from the polyisobutylene succinimide, the polyethylene glycol 400 benzene, the benzotriazole and the S3 weighed in the S1 at a stirring speed of 2000r/min at 80 ℃ for 30min, then cooling to 50 ℃ and stirring for 30min, and ultrasonically mixing for 20min after stirring to obtain the chemical cleaning agent composition.
In order to further illustrate the effects of the present invention, the present invention is further provided with a comparative example, which is specifically as follows.
Comparative example 1
A chemical cleaning agent composition is prepared from the following components in parts by weight: 3 parts of polyisobutylene polysuccinimide, 4 parts of sodium hydroxide, 4001 parts of polyethylene glycol, 0.2 part of benzotriazole, 120 parts of ethylene glycol and 10 parts of water.
The preparation method comprises the following specific steps:
s1, weighing 3 parts of polyisobutylene succinimide, 4 parts of sodium hydroxide, 4001 parts of polyethylene glycol, 0.2 part of benzotriazole, 120 parts of ethylene glycol and 10 parts of water in parts by weight;
s2, dissolving the sodium hydroxide weighed in the S1 into the water weighed in the S1 to obtain a sodium hydroxide solution;
s3, uniformly mixing the ethylene glycol weighed in the S1 and the sodium hydroxide solution obtained in the S2, and then carrying out magnetization treatment under the following conditions: magnetizing at magnetic field strength of 2500Gs and magnetizing speed of 0.8m/s at 40 deg.C for 30min to obtain magnetized solution;
and S4, stirring the magnetized solution obtained from the polyisobutylene succinimide, the polyethylene glycol 400, the benzotriazole and the S3 weighed in the S1 at a stirring speed of 2000r/min at 80 ℃ for 30min, then cooling to 50 ℃, stirring for 30min, and ultrasonically mixing for 20min after stirring to obtain the chemical cleaning agent composition.
Comparative example 2
A chemical cleaning agent composition is prepared from the following components in parts by weight: 5 parts of diethanolamine, 4 parts of sodium hydroxide, 4001 parts of polyethylene glycol, 0.2 part of benzotriazole, 120 parts of ethylene glycol and 10 parts of water.
The preparation method comprises the following specific steps:
s1, weighing 5 parts of diethanolamine, 4 parts of sodium hydroxide, 4001 parts of polyethylene glycol, 0.2 part of benzotriazole, 120 parts of ethylene glycol and 10 parts of water according to parts by weight;
s2, dissolving the sodium hydroxide weighed in the S1 into the water weighed in the S1 to obtain a sodium hydroxide solution;
s3, uniformly mixing the diethanolamine, the ethylene glycol weighed in the S1 and the sodium hydroxide solution obtained in the S2, and then carrying out magnetization treatment, wherein the magnetization treatment conditions are as follows: magnetizing at magnetic field strength of 2500Gs and magnetizing speed of 0.8m/s at 40 deg.C for 30min to obtain magnetized solution;
s4, stirring the magnetized solution obtained by the polyethylene glycol 400, the benzotriazole and the S3 weighed in the S1 at the stirring speed of 2000r/min at 80 ℃ for 30min, then cooling to 50 ℃, stirring for 30min, and ultrasonically mixing for 20min after stirring to obtain the chemical cleaning agent composition.
Comparative example 3
A chemical cleaning agent composition is prepared from the following components in parts by weight: 4 parts of sodium hydroxide, 4001 parts of polyethylene glycol, 0.2 part of benzotriazole, 120 parts of ethylene glycol and 10 parts of water.
The preparation method comprises the following specific steps:
s1, weighing 4 parts of sodium hydroxide, 4001 parts of polyethylene glycol, 0.2 part of benzotriazole, 120 parts of ethylene glycol and 10 parts of water in parts by weight;
s2, dissolving the sodium hydroxide weighed in the S1 into the water weighed in the S1 to obtain a sodium hydroxide solution;
s3, uniformly mixing the ethylene glycol weighed in the S1 and the sodium hydroxide solution obtained in the S2, and then carrying out magnetization treatment under the following conditions: magnetizing at magnetic field strength of 2500Gs and magnetizing speed of 0.8m/s at 40 deg.C for 30min to obtain magnetized solution;
s4, stirring the magnetized solution obtained by the polyethylene glycol 400, the benzotriazole and the S3 weighed in the S1 at the stirring speed of 2000r/min at 80 ℃ for 30min, then cooling to 50 ℃, stirring for 30min, and ultrasonically mixing for 20min after stirring to obtain the chemical cleaning agent composition.
The chemical cleaner compositions prepared in examples 1 to 3 and comparative examples 1 to 3 were applied to air preheaters totally clogged with ash scale to illustrate the effects of the present invention.
The height of the air preheater used in the test is 500mm, the chemical cleaning agent composition is sprayed into the box body of the air preheater at a high temperature (140-:
the removal rate of the ash scale is (H1-H2)/H1X 100%
In the formula: h1, the thickness of the ash scale before spraying the cleaning agent, namely the original thickness of the ash scale, which is mm; h2-the thickness of the ash scale is mm after spraying the cleaning agent for a certain time.
Specific results are shown in table 1.
TABLE 1 removal rate of ash scale
As can be seen from Table 1, in examples 1-3, about 22% of the scale was removed at 1 hour, about 32% of the scale was removed at 2 hours, about 70% of the scale was removed at 5 hours, and the air preheater box was completely soaked in 10 hours, so that all the scale was removed, the heat transfer element was clean as new, and the heat transfer efficiency was greatly improved. The air preheater treated by the test can be kept in a use state for 2.5 to 3 years.
In comparative example 1, as diethanolamine is not added, the effect of wetting and softening the ash scales is not as good as that of examples 1-3, so that sodium hydroxide cannot fully react with the ash scales in a dispersing way, and the cleaning effect is influenced.
In comparative example 2, polyisobutylene polysuccinimide is not added, the wetting and softening effects of diethanol amine on ash scale are influenced, and the dispersing effect of the cleaning agent is also influenced to a certain extent, so the cleaning effect is inferior to that of examples 1-3, but better than that of comparative example 1, which shows that the wetting and softening effects of diethanol amine on ash scale are more remarkable in the whole formula.
In the comparative example 3, the method is equivalent to directly adopting sodium hydroxide to clean the ash scale, although the boiling point of the solution can be improved by adding the glycol and carrying out magnetization treatment, the sodium hydroxide has poor permeability and is difficult to infiltrate and soften the ash scale, and the ash scale is difficult to react with the inner layer of the ash scale, so the cleaning effect is poor; the test results of comparative example 3 also further illustrate the efficacy of diethanolamine and the synergistic effect of polyisobutylene polysuccinimide on diethanolamine.
Comparing the data of comparative example 1 and comparative example 3, it can be found that the cleaning effect of comparative example 1 is better than that of comparative example 3, which indicates that the polyisobutylene succinimide may have a synergistic effect with sodium hydroxide or a synergistic effect with ethylene glycol, and can promote the treatment efficiency of sodium hydroxide on ash scale.
In order to verify the safety of the chemical cleaning agent of the present invention to the air preheater, the corrosion performance of the chemical cleaning agent in examples 1 to 3 and comparative examples 1 to 3 was tested, and the specific test method and results are as follows.
The corrosion test is to immerse the heat exchange element of the air preheater in the diluted cleaning agent for test, and evaluate the corrosion performance of the cleaning agent to metal by calculating the weight loss of the metal test piece and observing the change of the surface color.
Weighing the heat exchange element to obtain P1, soaking the heat exchange element in the cleaning agent, taking out the heat exchange element after 72 hours, washing the heat exchange element with clear water, drying, carrying out appearance inspection, and weighing again to obtain P2. The rate of corrosion of the heat transfer element by the cleaning agent is determined by the following formula:
corrosion rate (P1-P2)/P1X 100%
In the formula: p1-mass of test piece before soaking, g; p2-mass of test piece after soaking, g.
The specific results are shown in Table 2.
TABLE 2 Corrosion test results
As can be seen from Table 2, the chemical cleaning agents prepared in examples 1 to 3 and comparative example 1 exhibited good anticorrosive effects. Comparative example 2 is slightly corrosive, comparative example 3 is slightly corrosive, benzotriazole added in the present invention is used for corrosion prevention, but the amount of benzotriazole added is small in consideration of cost and environmental protection, but it can be seen from the data of comparative examples 1 to 3 that polyisobutylene succinimide contributes to the corrosion prevention performance of the cleaning agent.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. The chemical cleaning agent composition is characterized by being prepared from the following components in parts by weight: 5-10 parts of diethanolamine, 3-5 parts of polyisobutylene polysuccinimide, 3-5 parts of sodium hydroxide, 1-2 parts of surfactant, 0.1-0.3 part of benzotriazole, 100 parts of ethylene glycol and 150 parts of water;
the chemical cleaning agent composition is prepared according to the following steps:
s1, weighing 5-10 parts of diethanolamine, 3-5 parts of polyisobutylene succinimide, 3-5 parts of sodium hydroxide, 1-2 parts of surfactant, 0.1-0.3 part of benzotriazole, 150 parts of ethylene glycol and 10-15 parts of water according to parts by weight;
s2, dissolving the sodium hydroxide weighed in the S1 into the water weighed in the S1 to obtain a sodium hydroxide solution;
s3, uniformly mixing the diethanolamine and the ethylene glycol weighed in the S1 and the sodium hydroxide solution obtained in the S2, and then carrying out magnetization treatment to obtain a magnetized solution;
and S4, uniformly mixing the polyisobutylene succinimide weighed in the S1, the surfactant, the benzotriazole and the magnetized liquid obtained in the S3 to obtain the chemical cleaning agent composition.
2. The chemical cleaning agent composition as claimed in claim 1, which is prepared from the following components in parts by weight: 5 parts of diethanolamine, 3 parts of polyisobutylene succinimide, 4 parts of sodium hydroxide, 1 part of surfactant, 0.2 part of benzotriazole, 120 parts of ethylene glycol and 10 parts of water.
3. A chemical cleaning agent composition as claimed in claim 1 or 2, wherein the surfactant is polyethylene glycol 400.
4. A method of producing a chemical cleaning composition as claimed in claim 1, including the steps of:
s1, weighing 5-10 parts of diethanolamine, 3-5 parts of polyisobutylene succinimide, 3-5 parts of sodium hydroxide, 1-2 parts of surfactant, 0.1-0.3 part of benzotriazole, 150 parts of ethylene glycol and 10-15 parts of water according to parts by weight;
s2, dissolving the sodium hydroxide weighed in the S1 into the water weighed in the S1 to obtain a sodium hydroxide solution;
s3, uniformly mixing the diethanolamine and the ethylene glycol weighed in the S1 and the sodium hydroxide solution obtained in the S2, and then carrying out magnetization treatment to obtain a magnetized solution;
and S4, uniformly mixing the polyisobutylene succinimide weighed in the S1, the surfactant, the benzotriazole and the magnetized liquid obtained in the S3 to obtain the chemical cleaning agent composition.
5. The method for preparing a chemical cleaning agent composition according to claim 4, wherein the magnetization treatment conditions in S3 are as follows: magnetizing at magnetic field intensity of 2500-.
6. The method for preparing the chemical cleaning agent composition according to claim 4, wherein the specific operating conditions of S4 are as follows: and (3) stirring the polyisobutene polysuccinimide weighed in the step (S1), the surfactant, the benzotriazole and the magnetized solution obtained in the step (S3) at the stirring speed of 2000r/min at 80 ℃ for 30min, then cooling to 50 ℃, stirring for 30min, and ultrasonically mixing for 20min after stirring to obtain the chemical cleaning agent composition.
7. Use of a chemical cleaner composition according to claim 1 for air preheater descaling.
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| CN108856079B (en) * | 2018-06-15 | 2021-09-24 | 中国电建集团山东电力建设第一工程有限公司 | Device for rapidly cleaning scale of smoke cooler |
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