CN111171976A - Environment-friendly alkaline cleaning agent and preparation method thereof - Google Patents
Environment-friendly alkaline cleaning agent and preparation method thereof Download PDFInfo
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- CN111171976A CN111171976A CN202010050667.8A CN202010050667A CN111171976A CN 111171976 A CN111171976 A CN 111171976A CN 202010050667 A CN202010050667 A CN 202010050667A CN 111171976 A CN111171976 A CN 111171976A
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- environment
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- friendly alkaline
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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
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/32—Organic compounds containing nitrogen
- C11D7/3209—Amines or imines with one to four nitrogen atoms; Quaternized amines
-
- 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
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/06—Hydroxides
-
- 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
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/267—Heterocyclic 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
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/32—Organic compounds containing nitrogen
- C11D7/3245—Aminoacids
-
- 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
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/50—Solvents
- C11D7/5004—Organic solvents
- C11D7/5013—Organic solvents containing nitrogen
Abstract
The invention relates to an environment-friendly alkaline cleaning agent. The environment-friendly alkaline cleaning agent is prepared by compounding a chelating agent, a high-efficiency dispersant, a pH regulator and water; the weight percentage of each component is 20-60% of chelating agent, 5-20% of high-efficiency dispersant, 0.5-5% of pH regulator and the balance of water; the chelating agent is selected from one or two of tetrasodium iminodisuccinate and trisodium nitrilotriacetate, and the high-efficiency dispersant is selected from one or two of sodium polyepoxysuccinate and sodium polyaspartate. The invention provides an ecological environment-friendly cleaning agent, which does not contain phosphorus and a surfactant, does not contain foam, is easy to biodegrade, is nontoxic and harmless to the ecological environment, does not corrode materials such as metal, enamel, glass and the like, is harmless to human bodies, and can safely discharge cleaning waste liquid. The invention also relates to a preparation method of the environment-friendly alkaline cleaning agent.
Description
Technical Field
The invention relates to an environment-friendly alkaline cleaning agent and a preparation method thereof, in particular to an environment-friendly alkaline cleaning agent for removing hard scale of an air preheater.
Background
The problems of dust accumulation, blockage and corrosion of an air preheater generally exist in the operation of an SCR denitration device of a coal-fired thermal power generating unit, particularly after ultralow emission is implemented. According to the data of a certain domestic large-scale power generation group electric academy, about 50 percent of air preheaters of coal-fired boilers have blockage and corrosion in different degrees; especially, the problems of large ammonia escape amount, ash accumulation blockage and corrosion of the air preheater burning high-sulfur coal are more prominent. After the air preheater is deposited with dust and blocked, the problems of increased resistance of the air preheater, corrosion of heat storage sheets, rise of exhaust gas temperature, reduction of furnace efficiency and the like can be caused, and the safe and economic operation of a unit can be influenced in severe cases.
The main mechanism of ash deposition is: in the temperature range of 146-207 ℃, ammonium bisulfate is a high-viscosity liquid substance, is easy to condense and deposit on the surface of a heat exchange element of the air preheater, adheres to fly ash particles in flue gas, blocks a channel of the heat exchange element, increases the resistance of the air preheater and influences the heat exchange effect. Due to the alternate occurrence of cold air cooling and high-temperature calcination and the long-term accumulation process, the hardness of formed ash scales is high, the heat exchange efficiency is reduced, the flow area is smaller, and the heat efficiency of a unit is poor.
At present, the cleaning method commonly used in engineering is mainly physical cleaning and chemical cleaning technology. Physical cleaning techniques are generally methods that use mechanical or hydraulic forces to remove dirt from the surface of the air preheater. Chemical cleaning is a cleaning method in which dirt on the surface of an object is dissolved and dispersed in a liquid by a chemical agent or an aqueous solution thereof chemically reacting with the dirt.
Physical cleaning has no corrosion effect on equipment, but the physical cleaning has the defect that only the part which has a simple structure and can be reached by the acting force can be cleaned. When the interior of equipment with a complex structure needs to be cleaned, the equipment needs to be disassembled or disintegrated. The cleaning time is also long, and usually needs 20 days to 30 days. The chemical cleaning method for removing dirt mainly depends on the reaction capability of the cleaning agent, the chemical cleaning method can be generally used for cleaning in a circulating flow or on-line cleaning mode, and even if the chemical cleaning method is equipment with a complex structure, the equipment does not need to be disassembled or disassembled.
The specification of the Chinese patent with the publication number of CN104745337A and the specification of the Chinese patent with the publication number of CN107674778A both disclose a neutral chemical cleaning agent for cleaning the hard scale of the air preheater of a desulfurization system and a preparation method thereof. The cleaning agent adopts a phosphorus-containing polymer, various surfactants and penetrants, and generates a large amount of wastewater containing phosphorus and surfactants in the cleaning process. When the wastewater flows into rivers and lakes, eutrophication of water bodies can be caused, so that algae in the water bodies can be bred vigorously, and fishes and other aquatic organisms can die in an anoxic way until the water quality is deteriorated, even goes bad and smells bad. If the wastewater is discharged into a sewage treatment plant, the operation of the water treatment plant is difficult because of a large amount of foam in the flushing wastewater, and the content of the surfactant reaches a certain concentration, which can have adverse effects on the biochemical process in the biological treatment of the wastewater.
Therefore, the neutral chemical cleaning agent for cleaning the hard scale of the air preheater of the desulfurization system needs to be researched and developed, a new formula and a production process are provided, and the environmental problem caused by the existing cleaning agent is solved.
Disclosure of Invention
The invention provides an environment-friendly alkaline cleaning agent which has obvious cleaning effect, does not have chemical corrosion and mechanical damage to the cleaning of an air preheater and can quickly clean, does not contain phosphorus, does not contain foam, is easy to biodegrade, and is nontoxic and harmless to the ecological environment for solving the technical problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: an environment-friendly alkaline cleaning agent is prepared by compounding a chelating agent, a high-efficiency dispersant, a pH regulator and water; the weight percentage of each component is 20-60% of chelating agent, 5-20% of high-efficiency dispersant, 0.5-5% of pH regulator and the balance of water; the chelating agent is selected from one or two of tetrasodium iminodisuccinate and trisodium nitrilotriacetate, and the high-efficiency dispersant is selected from one or two of sodium polyepoxysuccinate and sodium polyaspartate.
The invention has the advantages and positive effects that: the invention provides an environment-friendly alkaline cleaning agent, which is prepared by compounding a chelating agent, a high-efficiency dispersant, a pH regulator and water, wherein the chelating agent is one or two of tetrasodium iminodisuccinate and trisodium aminotriacetate, and the high-efficiency dispersant is one or two of polyepoxysuccinic acid sodium and polyaspartic acid sodium. Because the iminodisuccinic acid tetrasodium, the nitrilotriacetic acid trisodium, the polyepoxysuccinic acid sodium and the polyaspartic acid sodium are non-phosphorus organic compounds, the water treatment chemical has good biodegradation performance and is a green water treatment chemical. The environment-friendly alkaline cleaning agent is used for cleaning hard scale of the air preheater, the pH value of the agent is alkaline, the agent does not corrode materials such as metal, enamel, glass and the like, the agent is harmless to human bodies, and waste liquid can be discharged safely. During the cleaning operation, need not disassemble the air preheater, the cleaning time is short, has shortened the repair time of equipment greatly, avoids disassembling the damage to the device, is showing the maintenance cost and the risk that reduce equipment, extension device life and effective utilization rate have considerable economic benefits and environmental benefit.
The chelating agent selected in the environment-friendly alkaline cleaning agent can provide four coordination bonds for metal ions, and the molecules are small, so the environment-friendly alkaline cleaning agent has very strong complexing ability, can form stable complexes with various metal ions such as calcium, magnesium, iron, copper, aluminum, zinc and the like, can dissolve sediments on the metal surface, and is not only a scale inhibitor and a corrosion inhibitor, but also the cleaning agent.
The efficient dispersant selected in the environment-friendly alkaline cleaner mainly comprises polyfunctional group high molecular organic polymers such as carboxyl, hydroxyl, amido and the like, and has excellent scale inhibition and dispersion functions. The dust scale adhered to the surface of the heat storage plate of the air preheater is hard but not dense generally. This is because ammonium bisulfate adheres a large amount of fly ash during the transition from the liquid state to the solid state. The fly ash has larger surface area and porosity, and the moisture absorption capacity of the fly ash is larger. By utilizing the characteristic of hygroscopicity, the arrangement form of molecules is changed through the permeation and chelation of the high-efficiency dispersant, and hard ash and dirt are changed into mortar capable of flowing along with water through the action of molecular force, so that the hard ash and dirt are stripped from the heat storage plate.
The chelating agent and the high-efficiency dispersant in the environment-friendly alkaline cleaning agent can form soluble intermolecular complexes, associations or double salts with insoluble substances, and the like, so that the cleaning agent has high cleaning capability on the extremely insoluble scales such as calcium sulfate scales and silicate scales, and has threshold synergistic effect.
Trisodium aminotriacetate is decomposed by bacterial action and its final products are CO2 and NH 3. The test proves that: trisodium aminotriacetate has a decomposition rate of 82-88% in rivers after two weeks at a temperature of 2 ℃, and can be completely biodegraded after several weeks. The peptide bond on the structural main chain of the polyaspartic acid is easy to be broken by microorganisms, fungi and the like, and the final degradation product is water and carbon dioxide which are harmless to the environment. The biodegradation speed of the polyaspartic acid hydrogel in the activated sludge is up to 76% in 28 days. Therefore, the environment-friendly alkaline cleaning agent is easy to biodegrade, is nontoxic and harmless to the ecological environment, does not corrode materials such as metal, enamel, glass and the like, is harmless to human bodies, and can safely discharge cleaning waste liquid.
Preferably: the pH regulator is sodium hydroxide aqueous solution.
Preferably: the mass fraction of the sodium hydroxide aqueous solution is 10%.
Preferably: the pH value of the environment-friendly alkaline cleaning agent is 7-9.
The invention also aims to provide an environment-friendly alkaline cleaning agent and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: an environment-friendly alkaline cleaning agent and a preparation method thereof comprise the following steps,
(1) weighing the components according to the weight percentage for later use;
(2) adding the high-efficiency dispersant into water and uniformly stirring;
(3) adding a chelating agent;
(4) slowly adding pH regulator, stirring and mixing until all components are uniformly mixed.
Preferably: and (4) controlling the temperature not to be higher than 60 ℃.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are described in detail.
Example one
The environment-friendly alkaline cleaning agent comprises the following components in parts by weight:
60% of tetrasodium iminodisuccinate, 5% of sodium polyepoxysuccinate, 0.5% of sodium hydroxide aqueous solution (the mass fraction is 10%) and 34.5% of water.
The preparation method comprises the following steps:
(1) weighing the components according to the weight percentage for later use;
(2) adding polyepoxysuccinic acid sodium into water and stirring uniformly;
(3) adding tetrasodium iminodisuccinate to the solution;
(4) slowly adding sodium hydroxide aqueous solution, stirring and mixing for about 30min until all the components are fully and uniformly mixed; in the step, the temperature is controlled below 60 ℃.
The performance test of the environment-friendly alkaline cleaning agent comprises the following steps:
the test method comprises the following steps: the cleaning agent is sprayed on the heat transfer element of the scaled air preheater (the scaled heat transfer element which is repaired and replaced by a power plant has the structure that a common cold-rolled steel plate is coated with enamel, and the scaling thickness is 3mm-5 mm);
and (3) testing results: statically wetting for 15min at room temperature, completely swelling and softening the dirt with the average thickness of about 4mm, washing with water gun under the pressure of 0.5-1.0MPa, and exposing the blue enamel surface. The enamel sheet was smooth with almost no residue by visual inspection.
Example two
The environment-friendly alkaline cleaning agent comprises the following components in parts by weight:
30% of tetrasodium iminodisuccinate, 20% of trisodium nitrilotriacetate, 10% of sodium polyepoxysuccinate, 3.5% of sodium hydroxide aqueous solution (the mass fraction is 10%) and 36.5% of water.
The preparation method comprises the following steps:
(1) weighing the components according to the weight percentage for later use;
(2) adding sodium polyepoxysuccinate to water;
(3) adding tetrasodium iminodisuccinate and trisodium nitrilotriacetate into the aqueous solution, wherein the trisodium nitrilotriacetate is used as a cosolvent;
(4) slowly adding sodium hydroxide aqueous solution, stirring and mixing for about 30min until all the components are fully and uniformly mixed; in the step, the temperature is controlled below 60 ℃.
The performance test of the environment-friendly alkaline cleaning agent comprises the following steps:
the test method comprises the following steps: the cleaning agent is sprayed on the heat transfer element of the scaled air preheater (the scaled heat transfer element which is repaired and replaced by a power plant has the structure that a common cold-rolled steel plate is coated with enamel, and the scaling thickness is 3mm-5 mm);
and (3) testing results: statically wetting for 10min at room temperature, completely swelling and softening the dirt with the average thickness of about 4mm, washing with water gun under the pressure of 0.5-1.0MPa, and exposing the blue enamel surface. The enamel sheet was smooth with almost no residue by visual inspection.
EXAMPLE III
The environment-friendly alkaline cleaning agent comprises the following components in parts by weight:
20% of tetrasodium iminodisuccinate, 10% of trisodium nitrilotriacetate, 10% of sodium polyaspartate, 3.5% of sodium hydroxide aqueous solution (the mass fraction is 10%) and 56.5% of water.
The preparation method comprises the following steps:
(1) weighing the components according to the weight percentage for later use;
(2) adding sodium polyaspartate into water;
(3) adding tetrasodium iminodisuccinate and trisodium nitrilotriacetate into the solution, wherein the trisodium nitrilotriacetate is used as a cosolvent;
(4) slowly adding sodium hydroxide aqueous solution, stirring and mixing for about 30min until all the components are fully and uniformly mixed; in the step, the temperature is controlled below 60 ℃.
The performance test of the environment-friendly alkaline cleaning agent comprises the following steps:
the test method comprises the following steps: the cleaning agent is sprayed on the heat transfer element of the scaled air preheater (the scaled heat transfer element which is repaired and replaced by a power plant has the structure that a common cold-rolled steel plate is coated with enamel, and the scaling thickness is 3mm-5 mm);
and (3) testing results: statically wetting for 15min at room temperature, completely swelling and softening the dirt with the average thickness of about 4mm, washing with water gun under the pressure of 0.5-1.0MPa, and exposing the blue enamel surface. The enamel sheet was smooth with almost no residue by visual inspection.
Application examples
The method is used for cleaning an air preheater of a 330MW cogeneration unit of a certain thermal power plant of Tianjin, the model of the air preheater is 29-VI (T) -1950-SMR, the air preheater is seriously scaled due to long-term use, and the air preheater is expected to be quickly cleaned within 72h due to limited overhaul time.
The cleaning agent in the first embodiment is used for removing the hard scale of the air preheater in the application embodiment, and the application conditions are as follows:
before cleaning: the scaling thickness of the air preheater is 3mm-5mm, and the average scaling thickness is about 4 mm;
the cleaning method comprises the following steps: the cleaning agent is directly sprayed on the heat exchange sheet of the air preheater which is stopped in operation, so that the two sides of the heat exchange enamel plate are soaked by the cleaning agent, the enamel plate is statically soaked for 30min at room temperature, the dirt is completely expanded and softened, and the enamel plate is cleaned by using high-pressure water, wherein the pressure of the washing water is controlled to be 0.5-1.0 Mpa;
the cleaning effect is as follows: after the cleaning agent is sprayed, dirt on the air preheater is quickly softened, after high-pressure water washing, the hot end of the air preheater is exposed to the natural color of metal, and the cold end of the air preheater is exposed to blue enamel.
The test results show that: the environment-friendly alkaline cleaning agent can quickly remove hard scales such as insoluble sulfate, silicate and the like on the surface of the air preheater, and in the cleaning application of the air preheater, the surface of a heat transfer element of the air preheater is smooth and clean, the hot end of the heat transfer element is exposed out of the natural color of metal, and the cold end of the heat transfer element is exposed out of blue enamel. By visual inspection, there was almost no residue, the removal rate of hard scale was nearly 100%, and no foam was generated during the high-pressure water washing. The on-line nondestructive cleaning of the air preheater is completed within 72h, the maintenance time of equipment is greatly shortened, the damage to the air preheater caused by disassembly and cleaning is avoided, the maintenance cost and risk of the equipment are obviously reduced, the service life and the effective utilization rate of the air preheater are prolonged, and considerable economic benefits and environmental protection benefits are achieved.
Claims (6)
1. An environment-friendly alkaline cleaning agent is characterized in that: is prepared by compounding a chelating agent, a high-efficiency dispersant, a pH regulator and water; the weight percentage of each component is 20-60% of chelating agent, 5-20% of high-efficiency dispersant, 0.5-5% of pH regulator and the balance of water; the chelating agent is selected from one or two of tetrasodium iminodisuccinate and trisodium nitrilotriacetate, and the high-efficiency dispersant is selected from one or two of sodium polyepoxysuccinate and sodium polyaspartate.
2. The environment-friendly alkaline cleaner as claimed in claim 1, wherein: the pH regulator is sodium hydroxide aqueous solution.
3. The environment-friendly alkaline cleaner as claimed in claim 2, wherein: the mass fraction of the sodium hydroxide aqueous solution is 10%.
4. The environment-friendly alkaline cleaner as claimed in claim 3, wherein: the pH value of the environment-friendly alkaline cleaning agent is 7-9.
5. The process for preparing environment-friendly alkaline cleaner as claimed in any one of claims 1 to 4, which is characterized by comprising the steps of: comprises the following steps of (a) carrying out,
(1) weighing the components according to the weight percentage for later use;
(2) adding the high-efficiency dispersant into water and uniformly stirring;
(3) adding a chelating agent;
(4) slowly adding pH regulator, stirring and mixing until all components are uniformly mixed.
6. The method for preparing environment-friendly alkaline cleaning agent as claimed in claim 5, which is characterized in that: and (4) controlling the temperature not to be higher than 60 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010050667.8A CN111171976A (en) | 2020-01-14 | 2020-01-14 | Environment-friendly alkaline cleaning agent and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010050667.8A CN111171976A (en) | 2020-01-14 | 2020-01-14 | Environment-friendly alkaline cleaning agent and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5034114A (en) * | 1989-07-28 | 1991-07-23 | Ira Kukin | Acid neutralizing combustion additive with detergent builder |
| CN102242028A (en) * | 2011-05-20 | 2011-11-16 | 浙江浙能能源技术有限公司 | Neutral detergent and application of neutral detergent in cleaning hard scale of gas-gas heater (GGH) |
| CN104745337A (en) * | 2015-04-09 | 2015-07-01 | 上海未来企业股份有限公司 | Neutral chemical cleaning agent for eliminating hard scales of air pre-heater of desulfurization system and preparation method of neutral chemical cleaning agent |
-
2020
- 2020-01-14 CN CN202010050667.8A patent/CN111171976A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5034114A (en) * | 1989-07-28 | 1991-07-23 | Ira Kukin | Acid neutralizing combustion additive with detergent builder |
| CN102242028A (en) * | 2011-05-20 | 2011-11-16 | 浙江浙能能源技术有限公司 | Neutral detergent and application of neutral detergent in cleaning hard scale of gas-gas heater (GGH) |
| CN104745337A (en) * | 2015-04-09 | 2015-07-01 | 上海未来企业股份有限公司 | Neutral chemical cleaning agent for eliminating hard scales of air pre-heater of desulfurization system and preparation method of neutral chemical cleaning agent |
Non-Patent Citations (5)
| Title |
|---|
| 张光华: "《水处理化学品制备与应用指南》", 31 October 2003, 中国石化出版社 * |
| 梁大新: "空预器无损清洗技术的研究与应用", 《当代旅游》 * |
| 汪多仁: "《绿色净水处理剂》", 30 November 2006, 科学技术文献出版社 * |
| 沈玉龙: "《绿色化学》", 29 February 2004, 中国环境科学出版社 * |
| 秦国治: "《化学清洗实用技术》", 30 November 1996, 中国石化出版社 * |
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Application publication date: 20200519 |