CN111533288B - Organic stabilizer for water quality of high-pressure drum boiler and preparation method thereof - Google Patents
Organic stabilizer for water quality of high-pressure drum boiler and preparation method thereof Download PDFInfo
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- CN111533288B CN111533288B CN202010354623.4A CN202010354623A CN111533288B CN 111533288 B CN111533288 B CN 111533288B CN 202010354623 A CN202010354623 A CN 202010354623A CN 111533288 B CN111533288 B CN 111533288B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
Abstract
The invention discloses an organic stabilizer for water quality of a high-pressure drum boiler and a preparation method thereof, wherein the organic stabilizer comprises the following raw materials in percentage by weight: 0.5-8% of aminopropylcyclohexylamine, 1-8% of iso-decaalkoxy propylamine, 0.5-9% of N-methyl-3- (methylamino) propionamide, 1-10% of tetrasodium iminodisuccinate, 0.2-9% of octadecylamine polyoxyethylene ether and the balance of deionized water; the organic stabilizer for the water quality of the high-pressure drum boiler adopts a phosphorus-free formula, so that not only can the corrosion and scaling of the pipe wall be avoided, the energy is saved, but also the working strength of operators can be reduced.
Description
Technical Field
The invention relates to an organic stabilizer for water quality of a high-pressure drum boiler and a preparation method thereof.
Background
At present, domestic high-pressure drum boilers are usually treated by trisodium phosphate, and the using mechanism of the trisodium phosphate is that phosphate radicals can be combined with metal ions in water to generate soft water slag, and the soft water slag is discharged out of the boiler body along with continuous discharge and fixed discharge of sewage water of the boiler so as to maintain the qualification of water and steam indexes and ensure the stable operation of the high-pressure drum boilers.
Due to the low price of trisodium phosphate products, phosphate treatment technology has been applied for decades. With its widespread use, it has some technical performance limitations, with the following drawbacks:
1) the sewage discharge amount is large, and the heat energy waste is serious;
2) the trisodium phosphate is adopted to treat the drum furnace water, so that water slag is formed, phosphate scale is easily formed, and the wall of the drum furnace water is easily damaged along with scale corrosion; meanwhile, trisodium phosphate belongs to inorganic salts and is a main source causing high salt content of furnace water, the high salt content of the furnace water can cause the problem of steam entrainment, and sodium, silicon dioxide and the like carried by steam are deposited on blades of a steam turbine to influence output and potential safety hazards;
3) phosphate, due to its physical and chemical properties of the product itself, increases in solubility at low loads; when the load is high, the solubility is reduced and precipitated, and the precipitate is attached to the pipe wall; scale such as iron, copper oxide, silicon dioxide and the like cannot be effectively inhibited; the boiler body is only antiseptic to a certain degree, and the steam condensate system is not protected;
4) when the addition amount of the trisodium phosphate is insufficient, metal acid corrosion is easily caused, and when the addition amount is too high, alkali embrittlement corrosion is easily caused; the manual control has longer time delay, so that the frequent fluctuation of the indexes of the furnace water and the steam is larger, and the control is difficult to be stable; the working intensity of operators is increased, and the requirements on the responsibility and technical level of the operators are strict.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an organic stabilizer for high-pressure drum boiler water quality, which adopts a phosphorus-free formula, can avoid corrosion and scaling of pipe walls, save energy and reduce the working strength of operators, and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an organic stabilizer for water quality of a high-pressure drum boiler comprises the following raw materials in percentage by weight: 0.5-8% of aminopropylcyclohexylamine, 1-8% of iso-decaalkoxy propylamine, 0.5-9% of N-methyl-3- (methylamino) propionamide, 1-10% of tetrasodium iminodisuccinate, 0.2-9% of octadecylamine polyoxyethylene ether and the balance of deionized water.
Preferably, the paint comprises the following components in percentage by weight: 5% of aminopropylcyclohexylamine, 2% of iso-decaalkoxy propylamine, 6% of N-methyl-3- (methylamino) propionamide, 4% of tetrasodium iminodisuccinate, 6% of octadecylamine polyoxyethylene ether and the balance of deionized water.
Preferably, the paint comprises the following components in percentage by weight: 7% of aminopropylcyclohexylamine, 6% of iso-decaalkoxy propylamine, 3% of N-methyl-3- (methylamino) propionamide, 3% of tetrasodium iminodisuccinate, 4% of octadecylamine polyoxyethylene ether and the balance of deionized water.
Preferably, the paint comprises the following components in percentage by weight: 4% of aminopropylcyclohexylamine, 4% of iso-decaalkoxy propylamine, 5% of N-methyl-3- (methylamino) propionamide, 5% of tetrasodium iminodisuccinate, 5% of octadecylamine polyoxyethylene ether and the balance of deionized water.
Further, the content of the effective component of the tetrasodium iminodisuccinate is 40%.
Further, the ethylene oxide number of the octadecylamine polyoxyethylene ether is 10-15 on average.
The invention aims to solve another technical problem of providing a preparation method of an organic stabilizer for water quality of a high-pressure drum boiler, which comprises the following steps:
1) adding deionized water accounting for 50% of the total amount of the deionized water into a first reaction kettle, sequentially adding N-methyl-3- (methylamino) propionamide and tetrasodium iminodisuccinate, uniformly stirring, keeping the temperature at 25-40 ℃ until the solution is a transparent solution, and standing;
2) adding deionized water accounting for 50% of the total amount of the deionized water into a second reaction kettle, sequentially adding aminopropylcyclohexylamine, octadecylamine polyoxyethylene ether and iso-decaalkoxy propylamine until the solution is transparent, and standing;
3) slowly and uniformly adding the solution prepared in the first reaction kettle into the second reaction kettle, simultaneously keeping the second reaction kettle to be stirred at a constant speed until the solution is stopped 30min after the addition is finished, standing for 0.5-1 h to obtain a uniform solution, and packaging a finished product after relevant indexes are detected to be qualified.
Description of the principle:
1) a continuous and compact protective film can be formed on the surfaces of the boiler body and the condensation water return pipeline, so that the corrosion of the surface of the boiler can be effectively prevented; the furnace water stabilizer chelates various scale forming corrosive ions, and the multiple components synergize to avoid the formation of scale and silica scale; through strong constraint on ion chelation and change of the surface form of furnace water, foam increase or steam-water costemesis are inhibited, steam entrainment is avoided, and the steam quality is purified; the water supply stabilizer can adjust and stabilize the pH value and dissolved oxygen of water supply, has no stimulation to environment and operators, and has no influence on human health;
2) the coating is environment-friendly and free of phosphorus, so that the phosphate hiding is fundamentally eliminated, the acid corrosion and the alkali brittleness corrosion caused by the phosphate are eliminated, and the problem of pipe wall leakage is reduced; the chemical can remove existing old scale in the operation of the boiler and is discharged out of the boiler body through pollution discharge, thereby obviously improving the heat transfer efficiency of the boiler, saving fuel and simultaneously avoiding the phenomenon of tube explosion caused by uneven heating of a furnace tube.
3) The boiler water purification agent is composed of a plurality of organic components, the salt content and the conductivity of the boiler water cannot be increased by the agent, and can be reduced to the minimum, so that the maximum water quality purification is realized, the lowest pollution discharge rate of a boiler is allowed to be 0.2%, and the regular arrangement is prolonged to 7-10 days from the original one time per shift; the continuous drainage is reduced to the minimum opening from the original opening, or is directly closed, and only the internal leakage of the valve is used for discharging pollution; the method can save the sewage discharge by more than 80 percent, improve the concentration multiple, save a large amount of heat energy and obviously increase the economic benefit.
The invention has the beneficial effects that:
the organic stabilizer for the water quality of the high-pressure steam drum boiler can completely surpass phosphate treatment, can form a complete corrosion and scaling protection system for a boiler water vapor system, can obviously reduce the pollution discharge of the boiler, and can greatly purify water vapor indexes, wherein aminopropyl cyclohexylamine and iso-deca alkoxy propylamine are used as novel neutralizers and adsorbents to neutralize acidic substances such as carbon dioxide and the like and can be adsorbed on the metal surface to form a protective film, tetrasodium iminodisuccinate is used as a green environment-friendly chelating corrosion inhibitor and can chelate metal ions in water so as to prevent scaling and corrosion, while N-methyl-3 (methylamino) propionamide, octadecyl amine polyoxyethylene ether and the like are used as a synergistic agent and have the comprehensive actions of a dissolution regulator, a surface control agent and the like, and furthermore, N-methyl-3 (methylamino) propionamide, N-methyl-3 (dimethylamino) propionamide, N-methyl-3-isopropylamine, N-isopropylamine and the like are used as a synergistic agent for the synergistic effect of the dissolution regulator and the dissolution regulator, Octadecylamine polyoxyethylene ether and the like are also used as film forming auxiliary agents or synergists and the like to synergistically play a role in corrosion protection, so that the whole formula system can comprehensively play a role.
Detailed Description
The present invention is further described below with reference to specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
Example 1
In the embodiment of the invention, the organic stabilizer for the water quality of the high-pressure drum boiler comprises the following components in percentage by weight: 4% of aminopropylcyclohexylamine, 3% of iso-decaalkoxy propylamine, 5% of N-methyl-3- (methylamino) propionamide, 6% of tetrasodium iminodisuccinate, 5% of octadecylamine polyoxyethylene ether and the balance of deionized water.
The content of the active component of the tetrasodium iminodisuccinate is 40%, and the average number of the oxyethane of the octadecylamine polyoxyethylene ether is 10-15.
A preparation method of an organic stabilizer for water quality of a high-pressure drum boiler comprises the following steps:
1) adding deionized water accounting for 50% of the total amount of the deionized water into a first reaction kettle, sequentially adding 5% of N-methyl-3- (methylamino) propionamide and 6% of tetrasodium iminodisuccinate, uniformly stirring, keeping the temperature at 25-40 ℃ until the solution is a transparent solution, and standing;
2) adding deionized water accounting for 50% of the total amount of the deionized water into a second reaction kettle, sequentially adding 4% of aminopropylcyclohexylamine, 5% of octadecylamine polyoxyethylene ether and 3% of iso-decaalkoxy propylamine until the solution is a transparent solution, and standing;
3) slowly and uniformly adding the solution prepared in the first reaction kettle into the second reaction kettle, simultaneously keeping the second reaction kettle to stir at a constant speed until the solution is stirred for 30min after the addition is finished, standing for 0.5-1 h to obtain a uniform solution, and packaging a finished product after relevant indexes are detected to be qualified.
The organic stabilizer for the water quality of the high-pressure drum boiler in the embodiment 1 is applied to the high-pressure drum boiler of 9.8Mpa in a certain thermal power plant, and the indexes of boiler water and steam are obviously purified: if the average electric conductivity of the furnace water is reduced to 22.0uS/cm from 41.3uS/cm, the average content of the saturated steam silicon dioxide is reduced to 5.8ug/L from 15.5 ug/L; the boiler continuous emission pollution discharge is reduced by 78%, and the fixed emission pollution discharge is reduced by 82%.
Example 2
In the embodiment of the invention, the organic stabilizer for the water quality of the high-pressure drum boiler comprises the following components in percentage by weight: 5% of aminopropylcyclohexylamine, 2% of iso-decaalkoxy propylamine, 6% of N-methyl-3- (methylamino) propionamide, 4% of tetrasodium iminodisuccinate, 6% of octadecylamine polyoxyethylene ether and the balance of deionized water.
The content of the active component of the tetrasodium iminodisuccinate is 40%, and the average number of the oxyethane of the octadecylamine polyoxyethylene ether is 10-15.
A preparation method of an organic stabilizer for water quality of a high-pressure drum boiler comprises the following steps:
1) adding deionized water accounting for 50% of the total amount of the deionized water into a first reaction kettle, sequentially adding 6% of N-methyl-3- (methylamino) propionamide and 4% of tetrasodium iminodisuccinate, uniformly stirring, keeping the temperature at 25-40 ℃ until the solution is a transparent solution, and standing;
2) adding deionized water accounting for 50% of the total amount of the deionized water into a second reaction kettle, sequentially adding 5% of aminopropylcyclohexylamine, 6% of octadecylamine polyoxyethylene ether and 2% of iso-decaalkoxy propylamine until the solution is a transparent solution, and standing;
3) slowly and uniformly adding the solution prepared in the first reaction kettle into the second reaction kettle, simultaneously keeping the second reaction kettle to be stirred at a constant speed until the solution is stopped 30min after the addition is finished, standing for 0.5-1 h to obtain a uniform solution, and packaging a finished product after relevant indexes are detected to be qualified.
The organic stabilizer for the water quality of the high-pressure drum boiler in the embodiment 2 is applied to the high-pressure drum boiler of 10.2Mpa in a certain petrochemical plant, and the indexes of boiler water and steam are obviously purified: if the furnace water conductivity is reduced to 24.1uS/cm from 46.2uS/cm on average, the saturated steam silicon dioxide content is reduced to 4.4ug/L from 12.2ug/L on average; the boiler continuous emission pollution discharge is reduced by 75 percent, and the fixed emission pollution discharge is reduced by 84 percent.
Example 3
In the embodiment of the invention, the organic stabilizer for the water quality of the high-pressure drum boiler comprises the following components in percentage by weight: 7% of aminopropylcyclohexylamine, 6% of iso-decaalkoxy propylamine, 3% of N-methyl-3- (methylamino) propionamide, 3% of tetrasodium iminodisuccinate, 4% of octadecylamine polyoxyethylene ether and the balance of deionized water.
The content of the active component of the tetrasodium iminodisuccinate is 40%, and the average number of the oxyethane of the octadecylamine polyoxyethylene ether is 10-15.
A preparation method of an organic stabilizer for water quality of a high-pressure drum boiler comprises the following steps:
1) adding deionized water accounting for 50% of the total amount of the deionized water into a first reaction kettle, sequentially adding 3% of N-methyl-3- (methylamino) propionamide and 3% of tetrasodium iminodisuccinate, uniformly stirring, keeping the temperature at 25-40 ℃ until the solution is a transparent solution, and standing;
2) adding deionized water accounting for 50% of the total amount of the deionized water into a second reaction kettle, sequentially adding 7% of aminopropylcyclohexylamine, 4% of octadecylamine polyoxyethylene ether and 6% of iso-decaalkoxy propylamine until the solution is a transparent solution, and standing;
3) slowly and uniformly adding the solution prepared in the first reaction kettle into the second reaction kettle, simultaneously keeping the second reaction kettle to be stirred at a constant speed until the solution is stopped 30min after the addition is finished, standing for 0.5-1 h to obtain a uniform solution, and packaging a finished product after relevant indexes are detected to be qualified.
The organic stabilizer for the water quality of the high-pressure drum boiler in the embodiment 3 is applied to the high-pressure drum boiler of 9.3Mpa in a certain coal chemical plant, and the indexes of boiler water and steam are obviously purified: if the electric conductivity of the furnace water is reduced to 21.2uS/cm from 44.3.3uS/cm on average, the content of saturated steam silicon dioxide is reduced to 3.2ug/L from 11.1ug/L on average; the boiler continuous emission pollution discharge is reduced by 76%, and the fixed emission pollution discharge is reduced by 80%.
Examples of the experiments
By the above examples, the organic stabilizer for water quality of the high-pressure drum boiler is prepared and used in boiler water, and indexes of the boiler water are recorded, and the results are shown in tables 1-4 below.
TABLE 1 conductivity of furnace Water
Note: the data in the table are average values of samples taken in a certain proportion every month.
As can be seen from Table 1, before the organic stabilizer for the water quality of the high-pressure drum boiler is used, the conductivity of the boiler water is higher, the fluctuation range is wider, and the control of the boiler water quality is not facilitated; after the organic stabilizer for the water quality of the high-pressure drum boiler is used, the conductivity of the boiler water is obviously reduced and basically stabilized in the range of 18-24 uS/cm.
TABLE 2 PH of furnace Water
Note: the data in the table are average values of samples taken in a certain proportion every month.
As can be seen from Table 2, before the organic stabilizer for the water quality of the high-pressure drum boiler is used, the fluctuation of the PH value of the boiler water is large, the difficulty of adding the chemical control index by workers is increased, and the stability of the boiler water quality and the steam quality is not facilitated; after the organic stabilizer for the water quality of the high-pressure drum boiler is used, the PH value of the boiler water is gradually stabilized in a narrower numerical value range and is in an optimal control range, which shows that the boiler water quality is well controlled and maintained after the organic stabilizer for the water quality of the high-pressure drum boiler is added.
TABLE 3 silica content of saturated steam
Note: the data in the table are average values of samples taken in a certain proportion every month.
As can be seen from Table 3, before the novel energy-saving product intelligent management system is used, the content of silicon dioxide in saturated steam is in the range of 6-13 ug/l, and the silicon dioxide is easy to deposit and enrich in pipelines and steam systems along with the accumulation of time. After the intelligent management system is used, the content of silicon dioxide in saturated steam is reduced to 4-6 ug/l, the carrying capacity is greatly reduced, and the quality of the steam is greatly purified after the intelligent management system is used stably.
TABLE 4 blow-down flow
Note: the data in the table are average values of samples taken in a certain proportion every month.
As can be seen from Table 4, before the organic stabilizer for the water quality of the high-pressure steam drum boiler is used, the continuous discharge opening is large, the discharge capacity of the boiler is always 6-7t/h after the boiler is discharged at least once per shift, and a large amount of high-temperature water and steam resources are wasted; after the organic stabilizer for the water quality of the high-pressure drum boiler is used, the continuous drainage opening degree is reduced to the minimum opening degree, the fixed drainage is reduced to 7-9 days once, the sewage discharge amount is reduced to 2-3t/h, a large amount of water vapor resources are saved, about 100 tons of sewage can be saved every day, the high-temperature sewage discharge cost is calculated according to 80 yuan/ton, about 240 ten thousand yuan can be saved every year, and the economic benefit increment is very obvious.
TABLE 5 parameter ranges for low to ultra high pressure boilers
The experimental example mainly aims at a high-pressure boiler, namely a drum boiler with the pressure range P being more than or equal to 5.4 Mpa.
The beneficial effects of the invention are:
the treatment performance of the organic stabilizer for the water quality of the high-pressure steam drum boiler can completely surpass that of phosphate treatment, a complete corrosion and scaling protection system can be formed for a water vapor system of the boiler, the pollution discharge of the boiler can be obviously reduced, and the water vapor index can be greatly purified, wherein aminopropylcyclohexylamine and iso-decaalkoxy propylamine are used as novel neutralizers and adsorbents for neutralizing acidic substances such as carbon dioxide and the like and can be adsorbed on the metal surface to form a protective film, tetrasodium iminodisuccinate is used as a green environment-friendly chelating corrosion inhibitor and can chelate metal ions in water to prevent scaling and corrosion, N-methyl-3 (methylamino) propionamide, octadecylamine polyoxyethylene ether and the like are used as a synergistic agent and have the comprehensive effects of a dissolution regulator, a surface control agent and the like, and N-methyl-3 (methylamino) propionamide, N-methyl-3 (dimethylamino) propionamide, N-isopropylamide, N-methyl-3-isopropylamide, N-methyl-3-isopropylamide, N-3-isopropylamide, N-isopropylamide, the mixture of the mixture and the mixture of the mixture and the mixture of the mixture and the mixture of the mixture and the mixture of the mixture, and, Octadecylamine polyoxyethylene ether and the like are also used as film forming auxiliary agents or synergists and the like to synergistically play a role in corrosion protection, so that the whole formula system can comprehensively play a role.
The above-described embodiments of the present invention are not intended to limit the scope of the present invention, and the embodiments of the present invention are not limited thereto, and various other modifications, substitutions and alterations can be made to the above-described structure of the present invention without departing from the basic technical concept of the present invention as described above, according to the common technical knowledge and conventional means in the field of the present invention.
Claims (6)
1. An organic stabilizer for water quality of a high-pressure drum boiler is characterized by comprising the following raw materials in percentage by weight: 0.5-8% of aminopropylcyclohexylamine, 1-8% of iso-decaalkoxy propylamine, 0.5-9% of N-methyl-3- (methylamino) propionamide, 1-10% of tetrasodium iminodisuccinate, 0.2-9% of octadecylamine polyoxyethylene ether and the balance of deionized water.
2. The organic stabilizer for the water quality of the high-pressure drum boiler as claimed in claim 1, which comprises the following components in percentage by weight: 5% of aminopropylcyclohexylamine, 2% of iso-decaalkoxy propylamine, 6% of N-methyl-3- (methylamino) propionamide, 4% of tetrasodium iminodisuccinate, 6% of octadecylamine polyoxyethylene ether and the balance of deionized water.
3. The organic stabilizer for the water quality of the high-pressure drum boiler as claimed in claim 1, which comprises the following components in percentage by weight: 7% of aminopropylcyclohexylamine, 6% of iso-decaalkoxy propylamine, 3% of N-methyl-3- (methylamino) propionamide, 3% of tetrasodium iminodisuccinate, 4% of octadecylamine polyoxyethylene ether and the balance of deionized water.
4. The organic stabilizer for the water quality of the high-pressure drum boiler as claimed in claim 1, which comprises the following components in percentage by weight: 4% of aminopropylcyclohexylamine, 4% of iso-decaalkoxy propylamine, 5% of N-methyl-3- (methylamino) propionamide, 5% of tetrasodium iminodisuccinate, 5% of octadecylamine polyoxyethylene ether and the balance of deionized water.
5. The organic stabilizer for water quality in a high-pressure drum boiler according to any one of claims 2 to 4, wherein the ethylene oxide number of the octadecylamine polyoxyethylene ether is 10 to 15 on average.
6. A preparation method of an organic stabilizer for water quality of a high-pressure drum boiler is characterized by comprising the following steps:
1) adding deionized water accounting for 50% of the total amount of the deionized water into a first reaction kettle, sequentially adding N-methyl-3- (methylamino) propionamide and tetrasodium iminodisuccinate, uniformly stirring, keeping the temperature at 25-40 ℃ until the solution is a transparent solution, and standing;
2) adding deionized water accounting for 50% of the total amount of the deionized water into a second reaction kettle, sequentially adding aminopropylcyclohexylamine, octadecylamine polyoxyethylene ether and iso-decaalkoxy propylamine until the solution is transparent, and standing;
3) slowly and uniformly adding the solution prepared in the first reaction kettle into the second reaction kettle, simultaneously keeping the second reaction kettle to be stirred at a constant speed until the solution is stopped 30min after the addition is finished, standing for 0.5-1 h to obtain a uniform solution, and packaging a finished product after relevant indexes are detected to be qualified.
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