CN114164061A - Composite cleaning agent, preparation method thereof and method for treating evaporator scaling - Google Patents
Composite cleaning agent, preparation method thereof and method for treating evaporator scaling Download PDFInfo
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- CN114164061A CN114164061A CN202111543485.5A CN202111543485A CN114164061A CN 114164061 A CN114164061 A CN 114164061A CN 202111543485 A CN202111543485 A CN 202111543485A CN 114164061 A CN114164061 A CN 114164061A
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- cleaning agent
- ethanol solution
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- 239000012459 cleaning agent Substances 0.000 title claims abstract description 76
- 239000002131 composite material Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 84
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229960001484 edetic acid Drugs 0.000 claims abstract description 26
- PNGBYKXZVCIZRN-UHFFFAOYSA-M sodium;hexadecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCCCCCS([O-])(=O)=O PNGBYKXZVCIZRN-UHFFFAOYSA-M 0.000 claims abstract description 24
- 229920001213 Polysorbate 20 Polymers 0.000 claims abstract description 19
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 claims abstract description 19
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 229920003169 water-soluble polymer Polymers 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 37
- 238000011282 treatment Methods 0.000 claims description 30
- 238000010790 dilution Methods 0.000 claims description 6
- 239000012895 dilution Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 4
- 239000001095 magnesium carbonate Substances 0.000 claims description 4
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 4
- 238000007865 diluting Methods 0.000 claims description 3
- 229910052925 anhydrite Inorganic materials 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract description 49
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000002351 wastewater Substances 0.000 description 22
- 238000006477 desulfuration reaction Methods 0.000 description 21
- 230000023556 desulfurization Effects 0.000 description 21
- 230000000694 effects Effects 0.000 description 20
- 238000012546 transfer Methods 0.000 description 14
- 238000001704 evaporation Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 230000008020 evaporation Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 238000005406 washing Methods 0.000 description 7
- 229920000136 polysorbate Polymers 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000008233 hard water Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 238000011866 long-term treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- 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
-
- 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
- C11D3/2006—Monohydric alcohols
- C11D3/201—Monohydric alcohols linear
-
- 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
- C11D3/33—Amino carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- 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
- C02F2303/14—Maintenance of water treatment installations
-
- 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
- C11D1/02—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
-
- 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
- C11D1/667—Neutral esters, e.g. sorbitan esters
-
- C11D2111/20—
Abstract
The invention relates to a composite cleaning agent, a preparation method thereof and a method for treating evaporator scaling. The composition comprises the following components in parts by weight: the water-soluble polymer comprises, by mass, 5-12% of an ethanol solution, 10-18% of Ethylene Diamine Tetraacetic Acid (EDTA) and an ethanol solution, 5-15% of sodium hexadecyl sulfonate and a pH regulator, wherein the mass ratio of the Tween-20 to the ethanol solution is 5-12%, the mass ratio of the EDTA to the ethanol solution is 10-18%, and the mass ratio of the sodium hexadecyl sulfonate to the ethanol solution is 10-15%. No scale can be seen by the right eye after cleaning, and more steam can be saved after cleaning, which is beneficial to energy saving and consumption reduction.
Description
Technical Field
The invention belongs to the technical field of evaporator scaling treatment, and particularly relates to a composite cleaning agent, a preparation method thereof and a method for treating evaporator scaling.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The desulfurization wastewater zero-discharge engineering mainly comprises the processes of pretreatment, concentration and decrement, final evaporation and the like, wherein the concentration and decrement of the desulfurization wastewater is a key part of the whole wastewater zero discharge. The concentrated commonly used of desulfurization waste water at present adopts multi-effect evaporator to concentrate desulfurization waste water, but among the evaporation process, especially near the evaporator heat exchange tube, the scale deposit appears most easily, and influences the normal heat-conduction of heat exchange tube to influence the evaporation efficiency of whole evaporimeter.
When the desulfurization wastewater is concentrated, calcium magnesium scale, calcium sulfate scale and part of organic/inorganic composite scale are usually formed, the formed scale has stable property and structure, the common cleaning agent is extremely difficult to treat, a large amount of manpower is usually needed, the recovery effect is poor, and the long-term stable operation of an evaporator is influenced.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a composite cleaning agent, a preparation method thereof and a method for treating evaporator scaling.
In order to solve the technical problems, the technical scheme of the invention is as follows:
in a first aspect, the composite cleaning agent is composed of the following components in parts by weight: the water-soluble polymer comprises, by mass, 5-12% of an ethanol solution, 10-18% of Ethylene Diamine Tetraacetic Acid (EDTA) and an ethanol solution, 5-15% of sodium hexadecyl sulfonate and a pH regulator, wherein the mass ratio of the Tween-20 to the ethanol solution is 5-12%, the mass ratio of the EDTA to the ethanol solution is 10-18%, and the mass ratio of the sodium hexadecyl sulfonate to the ethanol solution is 10-15%.
The existing cleaning agent has the problems that manual assistance is usually needed in the process of treating the scale, and the scale can be seen by naked eyes. When the desulfurization waste water is concentrated, calcium magnesium scale, calcium sulfate scale and partial organic/inorganic composite scale are generally formed, and the scale is stable in property and structure after being formed. Therefore, the existing cleaning agent can only clean the scale sample in the easy-to-clean area on the flat surface or the surface of the round pipe in the cleaning process, and part of the scale sample can be firmly fixed on the position of the heat exchange pipe of the evaporator, which is difficult to clean manually or has weak scouring force.
In the composite cleaning agent, the sodium hexadecyl sulfonate has good wetting, emulsifying, dispersing, foaming and decontamination capabilities in hard water. Good biodegradability and small irritation to human body.
Tween 20 is a nonionic surfactant, has the functions of emulsification, diffusion and the like, and has a certain cleaning effect on one hand and a dispersing effect on the other hand.
EDTA is an important complexing agent, can be complexed with various water inlet ions and mainly plays a role in damaging the crystal lattices of the scale sample, and sodium hexadecyl sulfonate mainly plays a role in cleaning organic components in the tile scale removal sample. The desulfurization waste water also contains organic components which are mainly derived from coal. In the process of concentrating the desulfurization wastewater, main components such as calcium sulfate, composite calcium-magnesium scale and the like are separated out to form scale, and some organic components are brought out, and play important roles of structural connection and stability in the scale formation. The composite cleaning agent can destroy organic components and stable crystal lattices formed in the scaling process of desulfurization wastewater.
The three additives supplement each other and cooperate with each other to facilitate the self-decomposition of the scale and the separation from the evaporator. The evaporator is generally used for evaporating high-salinity wastewater, the interior of the evaporator, particularly a stainless steel part and a circulating pump part, are extremely easy to corrode, and the components of the composite additive do not destroy the surface properties of the easy-to-corrode part in the evaporator during cleaning, so that the evaporator can stably run after being cleaned and the damage rate of the evaporator is not accelerated.
In some embodiments of the present invention, the composition comprises the following components in parts by weight: the water-soluble adhesive comprises an ethanol solution, Tween-20, EDTA, sodium hexadecyl sulfonate and a pH regulator, wherein the mass ratio percentage of the Tween-20 to the ethanol solution is 5-9%, the mass ratio percentage of the ethylene diamine tetraacetic acid to the ethanol solution is 11-15%, the mass ratio percentage of the sodium hexadecyl sulfonate to the ethanol solution is 8-13%, and the mass concentration of the ethanol solution is 10-12%.
In some embodiments of the present invention, the composition comprises the following components in parts by weight: the water-soluble adhesive comprises an ethanol solution, Tween-20, EDTA, sodium hexadecyl sulfonate and a pH regulator, wherein the mass ratio percentage of the Tween-20 to the ethanol solution is 7%, the mass ratio percentage of the ethylene diamine tetraacetic acid to the ethanol solution is 12%, the mass ratio percentage of the sodium hexadecyl sulfonate to the ethanol solution is 11%, and the mass concentration of the ethanol solution is 11%. Based on the composition, the basic functions of the substances can better cause the self-decomposition of the scale.
In some embodiments of the invention, the pH of the composite cleaning agent is 8.5 to 9.5; and further 9. The pH value of the composite cleaning agent is alkaline, so that the evaporator can be cleaned under an alkaline condition, and the surface of devices in the evaporator is prevented from being corroded under an acidic condition.
In one embodiment of the present invention, the pH adjuster is an alkaline agent such as sodium hydroxide or potassium hydroxide.
In a second aspect, the preparation method of the composite cleaning agent comprises the following steps: adding Tween-20, ethylenediamine tetraacetic acid and sodium hexadecylsulfonate into the ethanol solution in sequence, and then adjusting the pH value.
In a third aspect, the method for treating the evaporator scaling by using the composite cleaning agent comprises the following steps:
diluting the composite cleaning agent into a first treatment cleaning agent and a second treatment cleaning agent;
introducing the cleaning agent for the first treatment into an evaporator for circulation, and then discharging;
and introducing the cleaning agent for the second treatment into the evaporator for circulation, and then discharging.
According to the invention, by using the cyclic cleaning method and the stepped cleaning method, the scale can be gradually decomposed under the condition of flushing by the composite cleaning agent, the using amount of the composite cleaning agent can be reduced, and a large amount of cleaning wastewater cannot be generated along with the cleaning process.
In some embodiments of the invention, the first treatment of the cleaning agent is performed by diluting the composite cleaning agent by a factor of 3 to 6; the dilution times of the composite cleaning agent in the second treatment of the cleaning agent are 8-11 times. Further, the dilution multiple of the composite cleaning agent in the first treatment is 5 times; the dilution times of the composite cleaning agent in the second treatment of the cleaning agent are 10 times. The dilution multiple of the cleaning agent is lower than that of the cleaning agent for the second time, so the concentration of the cleaning agent for the first time is higher, the cleaning agent is used for primarily cleaning the scale, and the cleaning agent for the second time is used for further treating the scale, so that the scale is decomposed more thoroughly.
In some embodiments of the invention, the first treatment rinse has a volume of 1/10 added to the evaporator treatment volume, the first treatment rinse circulating in the evaporator for a time of not less than 1 hour; further, the circulation time is 1.5-3 h; still further 1.5 h.
In some embodiments of the invention, the volume of the second treatment rinse is 1/10 added to the treatment volume of the evaporator, and the first treatment rinse is circulated in the evaporator for a time period of not less than 1 hour; further, the circulation time is 1h-3 h; still further 1 h.
In some embodiments of the invention, the evaporator is flushed with a rinse water cycle after the second treatment rinse is discharged. And (3) washing the composite cleaning agent and the dirt in the evaporator by using water, wherein the volume of the further washing water is equal to the treatment volume of the evaporator, and the circulation time is 5-20 min.
In some embodiments of the invention, the fouling composition in the evaporator is CaO, MgCO3、CaSO4One or more of (a). The composite cleaning agent can clean residual scale samples of various desulfurization waste water evaporated in the evaporator, has good cleaning effect on various scale samples with calcium sulfate as a main component, calcium carbonate as a main component and magnesium carbonate as a main component, and can support the efficient and stable operation of the whole desulfurization waste water zero-discharge project.
In the cleaning process, the cleaning evaporator can also be other equipment, scale samples are formed by the equipment due to concentration or long-term treatment operation of the desulfurization wastewater, such as a high-pressure reverse osmosis membrane for cleaning concentration of the desulfurization wastewater, a triple box and other equipment, and the application range is wide.
One or more technical schemes of the invention have the following beneficial effects:
the composite cleaning agent has a good cleaning effect on scale formation of the desulfurization wastewater, no scale formation is visible to the right eye after cleaning, more steam is saved after cleaning, and the composite cleaning agent is beneficial to energy conservation and consumption reduction.
The cleaning agent designed by the invention can efficiently clean scale samples formed by evaporating desulfurization wastewater in the evaporator under an alkaline condition, and avoids corrosion of the surfaces of devices in the evaporator caused by acidic cleaning agents of conventional cleaning agents.
The invention designs the composite cleaning agent in a targeted manner aiming at the components of the scale sample formed by the desulfurization wastewater during evaporation, has excellent cleaning efficiency, and can effectively clean various scale samples such as calcium sulfate scale, calcium carbonate scale, magnesium carbonate scale and the like formed by the desulfurization wastewater during evaporation.
In the cleaning process of the evaporator, a gradient internal circulation mode is adopted for cleaning, various types of waste water after cleaning are combined and then treated, and a mode of respectively treating after solid-liquid separation is adopted, so that secondary pollution is avoided.
The composite cleaning agent can clean scale samples formed in the evaporator during evaporation and concentration of various desulfurization waste water, and has good cleaning effect on the scale samples formed in different concentration processes and concentration processes.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a diagram of a system for cleaning evaporator scale with the composite cleaning agent of the present invention;
the system comprises an evaporator 1, a circulating pump 2, an evaporating pipe 3, a discharge port 4, a centrifuge 5 and a water inlet 6.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The invention will be further illustrated by the following examples
Example 1
(1) Preparing a composite cleaning agent: firstly, preparing 11% ethanol solution, then adding 7% industrial pure Tween-20 under the condition of continuously stirring, after Tween is completely dissolved, adding 12% EDTA, then adding 11% sodium hexadecylsulfonate, and then regulating pH to 9.
(2) And (3) internal circulation stepped cleaning of an evaporator: as shown in fig. 1, firstly, the composite cleaning agent is diluted by 5 times, 1/10 with the processing volume per unit time of the evaporator 1 is added into the evaporator 1, the liquid discharged through the discharge port 4 passes through the evaporator circulating pump 2 and enters the evaporator 1 through the water inlet 6 of the evaporator 1, the circulating time is controlled to be 1.5h, then the circulating pump 2 is stopped, the cleaning liquid is discharged into the centrifuge 5 through the discharge port 4, then the cleaning agent diluted by 10 times is introduced, 1/10 with the processing volume of the evaporator is added, then the evaporator circulating pump 2 is opened, the total circulating time is 1h, then the circulating pump 2 is stopped, and the cleaning liquid is discharged. The evaporator was a double effect evaporator and the average composition of the scale sample inside the evaporator is shown in table 1.
(3) Washing with softened water of an evaporator: the introduction volume is the evaporator treatment volume 1: 1, circulating for 10min, discharging, and repeating the softened water washing process for three times to finish the washing process.
(4) Evaluation of cleaning effect: and directly observing the inside of the evaporator to observe whether a scale sample can be seen by naked eyes, and then observing the relation between the total heat transfer quantity of the steam and the desulfurization wastewater treatment evaporation quantity in unit time after the steam is introduced. The detection and heat transfer are shown in Table 1.
TABLE 1 examination and Heat transfer
Example 2
(1) Preparing a composite cleaning agent: same as example 1
(2) And (3) internal circulation stepped cleaning of an evaporator: the stepwise cleaning procedure was the same as in example 1, the evaporator was a double effect evaporator, and the average composition of the scale sample inside the evaporator is shown in Table 2.
(3) Washing with softened water of an evaporator: same as example 1
(4) Evaluation of cleaning effect: and directly observing the inside of the evaporator to observe whether a scale sample can be seen by naked eyes, and then observing the relation between the total heat transfer quantity of the steam and the desulfurization wastewater treatment evaporation quantity in unit time after the steam is introduced. The detection and heat transfer are shown in Table 2.
TABLE 2 examination of conditions and Heat transfer
Example 3
(1) Preparing a composite cleaning agent: same as example 1
(2) And (3) internal circulation stepped cleaning of an evaporator: the stepwise cleaning procedure was the same as in example 1, the evaporator was a double effect evaporator, and the average composition of the scale sample inside the evaporator is shown in Table 3.
(3) Washing with softened water of an evaporator: same as example 1
(4) Evaluation of cleaning effect: and directly observing the inside of the evaporator to observe whether a scale sample can be seen by naked eyes, and then observing the relation between the total heat transfer quantity of the steam and the desulfurization wastewater treatment evaporation quantity in unit time after the steam is introduced. The detection and heat transfer are shown in Table 3.
TABLE 3 examination and Heat transfer
The composite cleaning agent can be obtained through the embodiments 1 to 3, can be used for treating the scales of evaporators with different component contents, and has better heat transfer effect of the evaporators after cleaning and reduced consumed steam amount.
Example 4
Compared with the embodiment 1, the compound cleaning agent in the step (1) is prepared differently, firstly, 11% ethanol solution is prepared, then 7% industrial pure tween-20 is added under the condition of continuous stirring, after tween is completely dissolved, 10% EDTA is added, 11% sodium hexadecylsulfonate is added, and then the pH value is adjusted to 9.
The cleaning method was the same as in example 1.
The method for evaluating the cleaning effect in the step (4) was the same as in example 1, and the results are shown in table 4.
TABLE 4 examination and Heat transfer
Example 5
Compared with the embodiment 1, the compound cleaning agent in the step (1) is prepared differently, firstly, 11% ethanol solution is prepared, then 7% industrial pure tween-20 is added under the condition of continuous stirring, after tween is completely dissolved, 12% EDTA is added, 7% sodium hexadecylsulfonate is added, and then the pH value is adjusted to 9.
The cleaning method was the same as in example 1.
The method for evaluating the cleaning effect in the step (4) was the same as in example 1, and the results are shown in table 5.
TABLE 5 examination of the conditions and Heat transfer
Compared with example 1, in example 4 and example 5, less EDTA is added, the damage effect on scale formation during cleaning is weaker, and a scale can be seen by naked eyes after cleaning, so that the cleaning effect is poor. In example 5, it can be seen that the addition of less sodium hexadecyl sulfonate causes less damage to scale during cleaning, and scale is still visible to the naked eye after cleaning.
Comparative example 1
Compared with the embodiment 1, the compound cleaning agent in the step (1) is prepared differently, firstly, 11% ethanol solution is prepared, then 7% industrial pure tween-20 is added under the condition of continuous stirring, 12% EDTA is added after tween is completely dissolved, and then the pH value is adjusted to 9.
The cleaning method was the same as in example 1.
The method for evaluating the cleaning effect in the step (4) was the same as in example 1, and the results are shown in table 6.
TABLE 6 examination of conditions and Heat transfer
Comparative example 2
Compared with the embodiment 1, the compound cleaning agent in the step (1) is prepared differently, firstly, 11% ethanol solution is prepared, then 7% industrial pure tween-20 is added under the condition of continuous stirring, after tween is completely dissolved, 11% sodium hexadecylsulfonate is added, and then the pH value is adjusted to 9.
The cleaning method was the same as in example 1.
The method for evaluating the cleaning effect in the step (4) was the same as in example 1, and the results are shown in table 6.
TABLE 6 examination of conditions and Heat transfer
Comparison of comparative examples 1 and 2 with example 1 shows that sodium hexadecyl sulfonate was not added in comparative example 1 and EDTA was not added in comparative example 2. The cleaning effect of the comparative example 1 and the comparative example 2 is poor, more scales cannot be cleaned, and only a part of scales with poor bonding force or small scale can be cleaned. A combination of three additives is required to remove some of the larger scale.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A composite cleaning agent is characterized in that: the composition comprises the following components in parts by weight: the water-soluble polymer comprises, by mass, 5-12% of an ethanol solution, 10-18% of Ethylene Diamine Tetraacetic Acid (EDTA) and an ethanol solution, 5-15% of sodium hexadecyl sulfonate and a pH regulator, wherein the mass ratio of the Tween-20 to the ethanol solution is 5-12%, the mass ratio of the EDTA to the ethanol solution is 10-18%, and the mass ratio of the sodium hexadecyl sulfonate to the ethanol solution is 10-15%.
2. The composite cleaning agent according to claim 1, wherein: the composition comprises the following components in parts by weight: the water-soluble adhesive comprises an ethanol solution, Tween-20, EDTA, sodium hexadecyl sulfonate and a pH regulator, wherein the mass ratio percentage of the Tween-20 to the ethanol solution is 5-9%, the mass ratio percentage of the ethylene diamine tetraacetic acid to the ethanol solution is 11-15%, the mass ratio percentage of the sodium hexadecyl sulfonate to the ethanol solution is 8-13%, and the mass concentration of the ethanol solution is 10-12%.
3. The composite cleaning agent according to claim 1, wherein: the composition comprises the following components in parts by weight: the water-soluble adhesive comprises an ethanol solution, Tween-20, EDTA, sodium hexadecyl sulfonate and a pH regulator, wherein the mass ratio percentage of the Tween-20 to the ethanol solution is 7%, the mass ratio percentage of the ethylene diamine tetraacetic acid to the ethanol solution is 12%, the mass ratio percentage of the sodium hexadecyl sulfonate to the ethanol solution is 11%, and the mass concentration of the ethanol solution is 11%.
4. The composite cleaning agent according to claim 1, wherein: the pH value of the composite cleaning agent is 8.5-9.5.
5. The method for preparing the composite cleaning agent as claimed in any one of claims 1 to 4, wherein: the method comprises the following steps: adding Tween-20, ethylenediamine tetraacetic acid and sodium hexadecylsulfonate into the ethanol solution in sequence, and then adjusting the pH value.
6. A method for treating evaporator scaling by using the composite cleaning agent as claimed in any one of claims 1 to 4, which is characterized in that: the method comprises the following steps:
diluting the composite cleaning agent into a first treatment cleaning agent and a second treatment cleaning agent;
introducing the cleaning agent for the first treatment into an evaporator for circulation, and then discharging;
and introducing the cleaning agent for the second treatment into the evaporator for circulation, and then discharging.
7. The method for treating evaporator scaling with composite cleaning agent as claimed in claim 6, wherein: the dilution times of the composite cleaning agent in the first cleaning agent treatment are 3-6 times; the dilution times of the composite cleaning agent in the second treatment of the cleaning agent are 8-11 times.
8. The method for treating evaporator scaling with composite cleaning agent as claimed in claim 6, wherein: the volume of the first treatment cleaning agent is 1/10 of the treatment volume of the evaporator, and the circulation time of the first treatment cleaning agent in the evaporator is not less than 1 h.
9. The method for treating evaporator scaling with composite cleaning agent as claimed in claim 6, wherein: the volume of the second treatment rinse is 1/10 added to the evaporator treatment volume and the first treatment rinse is circulated in the evaporator for a time period not less than 1.
10. The method for treating evaporator scaling with composite cleaning agent as claimed in claim 6, wherein: the components of the scale in the evaporator are CaO and MgCO3、CaSO4One or more of (a).
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