CN111102875A - Cleaning formula and cleaning method for air cooler - Google Patents
Cleaning formula and cleaning method for air cooler Download PDFInfo
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- CN111102875A CN111102875A CN201911232157.6A CN201911232157A CN111102875A CN 111102875 A CN111102875 A CN 111102875A CN 201911232157 A CN201911232157 A CN 201911232157A CN 111102875 A CN111102875 A CN 111102875A
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- 230000000694 effects Effects 0.000 claims abstract description 22
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- 238000005406 washing Methods 0.000 claims abstract description 19
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- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 15
- 239000002253 acid Substances 0.000 claims abstract description 11
- 230000000844 anti-bacterial effect Effects 0.000 claims abstract description 11
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
- F28G9/005—Cleaning by flushing or washing, e.g. with chemical solvents of regenerative heat exchanger
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/0005—Other compounding ingredients characterised by their effect
- C11D3/0073—Anticorrosion compositions
-
- 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
- C11D3/48—Medical, disinfecting agents, disinfecting, antibacterial, germicidal or antimicrobial compositions
-
- 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
- C11D7/08—Acids
-
- 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
- C11D7/34—Organic compounds containing sulfur
-
- 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
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/10—Objects to be cleaned
- C11D2111/14—Hard surfaces
- C11D2111/20—Industrial or commercial equipment, e.g. reactors, tubes or engines
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses a cleaning formula for an air cooler, which comprises a first mixed reagent used in a sterilization stripping stage and a second composite acid reagent used in an acid washing stage, wherein the first mixed reagent comprises a bactericide, an accelerant and a defoaming agent, and the second composite acid reagent comprises a corrosion inhibitor, an organic acid and a pH regulator. Also disclosed is a cleaning method comprising: firstly, physically cleaning an air cooler; secondly, chemical cleaning is carried out on the air cooler by timely putting cleaning agents contained in a cleaning formula for the air cooler into the air cooler. The invention adopts a mode of combining physical cleaning and chemical cleaning to clean the air cooler in the water supply system, so that the cleaning effect of the air cooler can be improved, and the cooling efficiency of the surface evaporation air cooler is improved.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a cleaning formula for an air cooler and a cleaning method for the air cooler.
Background
Generally, in a water supply project, the contradiction between the water supply temperature of a water system and the water quality (hardness) of water supply in summer is obvious, on one hand, the cooling effect is influenced due to the scaling phenomenon of a tube bundle of a surface evaporation type air cooler serving as cooling equipment, and the phenomenon that the user demand cannot be met occurs, and on the other hand, in order to ensure the water supply temperature, the new industrial water amount needs to be increased or is forced to be increased for replacement, so that the energy consumption and the purchase cost are increased. Therefore, in order to meet the requirement of users on water temperature, the tube bundle of the surface evaporation type air cooler needs to be cleaned periodically every year.
The surface evaporation type air cooler is a new energy-saving cooling equipment for cooling circulating water, and is mainly characterized by that it utilizes the evaporation of water film outside the tube bundle to intensify heat transfer outside the tube. In the working process, the circulating cooling water in the water pool at the lower part of the cooling equipment is conveyed to a spraying distributor on a horizontally placed tube bundle by a water pump, and the cooling water is sprayed downwards to the surface of a heat transfer tube by the spraying distributor, so that a continuous and uniform thin water film is formed on the outer surface of the heat transfer tube; meanwhile, air is sucked into the cooling equipment from the lower air suction window by a fan, so that the air flows from bottom to top and transversely blows across the horizontally arranged tube bundle. In the working process, the external heat transfer of the heat transfer pipe depends on the sensible heat transfer between the water film and the air, and the rapid evaporation of the water film on the outer surface of the pipe bundle also absorbs a large amount of heat, so that the external heat transfer is enhanced.
From the structure, the surface evaporation type air cooler is mainly characterized in that a cooler and a heat exchanger are combined into a whole, a separate circulating water cooling system is omitted, the floor area of equipment is reduced, and a light pipe is adopted as a heat transfer pipe, so that the primary investment is greatly reduced; on the other hand, the surface evaporation type air cooler can adopt a light pipe, so that the air resistance is small, the required air quantity is small, and in addition, the cooling water in the air cooler can be recycled in the equipment, so that the evaporation consumption of the water is low, and the operation cost of the air cooler is also reduced.
However, the conventional cleaning method is limited by the structure of the air cooler, the pressure of the cleaning water and other conditions, and cannot be completely cleaned.
Therefore, there is a need in the art for an improved cleaning formulation for air coolers and a cleaning method thereof to improve the cleaning effect of air coolers such as surface evaporative air coolers, lower the feed water temperature of the water supply system, and meet production requirements.
Disclosure of Invention
In view of the above technical problems in the prior art, an object of the present invention is to provide an improved cleaning formula for an air cooler and a cleaning method thereof, wherein a physical cleaning and a chemical cleaning are combined to clean the air cooler in a water supply system, so that the cleaning effect of the air cooler can be improved, and the cooling efficiency of a surface evaporation air cooler can be improved.
On the basis of traditional physical cleaning, the invention combines the structural characteristics of air coolers such as a surface evaporation type air cooler and the like and the test analysis result of the scale sample of the tube bundle thereof, adopts a high-efficiency chemical cleaning technology, namely, under the corrosion inhibition effect of a corrosion inhibitor, the scale and corrosion products of the tube bundle of the air cooler enter water in an ionic state and a complexing state by utilizing the acidity and the complexing effect of acid, and then the water is discharged through liquid replacement, and the cleaned dirt is discharged out of a water supply system, thereby realizing the cleaning effect.
It is emphasized that, unless otherwise indicated, the terms used herein correspond to the ordinary meanings of the various technical and scientific terms in the art, and the meanings of the technical terms defined in the various technical dictionaries, textbooks, etc.
To this end, according to an embodiment of the present invention, there is provided a cleaning formulation for an air cooler, wherein the cleaning formulation includes a first mixed chemical for a sterilization stripping stage and a second mixed chemical for a pickling stage, wherein the first mixed chemical includes a bactericide for removing foreign materials attached to the air cooler, an accelerator for enhancing the activity of a cleaning agent, and an antifoaming agent, and wherein the second mixed chemical includes a corrosion inhibitor for inhibiting corrosion of metals, an inhibitor, an organic acid for cleaning dirt attached to the air cooler, and a pH adjuster.
In one embodiment, the bactericide can comprise 90-120 mg/L, the accelerant can comprise 90-120 mg/L, and the defoaming agent can be added according to the foam condition. Preferably, the bactericide may comprise 100mg/L and the accelerator may comprise 100 mg/L.
The bactericide can be used for removing various impurities such as algae, fungus substances and the like on the air cooler tube bundle. The enhancer may be used to enhance the activity of the first mixed medicament.
In one embodiment, the corrosion inhibitor may comprise 0.3-0.7 mg/L, the inhibitor may comprise 0.1-0.5 mg/L, the organic acid may comprise 2-8 mg/L, and the pH adjustor may comprise 2-6 mg/L. Preferably, the corrosion inhibitor may comprise 0.5 mg/L.
Preferably, sulfamic acid may be used as the organic acid.
In another aspect, according to another embodiment of the present invention, there is provided a cleaning method for an air cooler, wherein the cleaning method includes the following steps performed in order:
firstly, physically cleaning an air cooler; and
next, the air cooler is chemically cleaned by timely feeding the cleaning agent included in the cleaning formulation for the air cooler described in the above embodiment into the air cooler.
Further, before the step of chemically cleaning the air cooler, the air cooler may be disconnected from other equipment of the water supply system, and then the temporary chemical cleaning device and the air cooler may be formed into a single closed circulation loop. For example, before chemical cleaning, the water valve of the cleaned air cooler can be closed first, and a temporary chemical cleaning device is connected; then, can adopt the washing liquid of clarified water pump in with the washing tank to squeeze into spray tube bank, the washing liquid gets into the catch basin through the air cooler, then, adopts again to take out the washing liquid to the washing tank with the immersible pump, so circulate and form independent closed circulation circuit to do not influence the normal operating of other equipment in the water supply system, can realize full flow control again.
Further, the temporary chemical cleaning apparatus may include a cleaning tank located upstream of the air cooler for supplying a cleaning liquid, a sump located downstream of the air cooler for receiving a liquid discharged from the air cooler, and a pumping means for circulating the liquid between the cleaning tank, the air cooler, and the sump in a closed state, wherein the cleaning liquid includes the above-mentioned cleaning agent.
Preferably, the pumping means may comprise: the clear water pump is arranged between the cleaning tank and the air cooler and is used for pumping the cleaning liquid in the cleaning tank to the air cooler; and the submersible pump is arranged between the water collecting tank and the cleaning tank and is used for pumping the cleaning liquid in the water collecting tank to the cleaning tank.
Further, the step of physically cleaning the air cooler may include:
dredging the air cooler;
cleaning the outer surface of the tube bundle of the air cooler and impurities nearby the outer surface; and
and cleaning a water collecting tank positioned on the downstream of the air cooler to enable the water collecting tank to have a water injection condition.
Further, the step of chemically cleaning the air cooler may include:
a sterilization stripping stage, wherein, firstly, the water sample in the water collecting tank is fully analyzed, then, after the water quality in the water collecting tank is determined to meet the cleaning requirement, a first mixed medicament is timely put into the water collecting tank, and a closed circulation loop is operated to clean the air cooler until the liquid in the water collecting tank meets the requirement;
a water quality replacement stage, wherein after the sterilization stripping stage is finished, sewage in the water collecting tank is discharged, and fresh water is replenished into the water collecting tank;
a descaling chemical cleaning stage comprising a plurality of pickling stages.
Further, the pickling stage may include a pickling stage i, a pickling stage ii, and a pickling stage iii.
Preferably, the pickling stage i may comprise: firstly, adding a corrosion inhibitor; after circulating for 1 hour, adding a first pH regulator into the independent closed circulation loop, and when the pH value is reduced to 4-5, adding organic acid to control the pH value in the independent closed circulation loop to be 3-4 for chemical cleaning; during the period, the pH value is measured once every half hour, and a first pH regulator and organic acid are added in due time to control the pH value according to the change of the pH value and the total hardness;
the pickling stage ii may comprise: firstly, adding a corrosion inhibitor; after circulating for 1 hour, adding a second pH regulator into the single closed circulation loop; when the pH value is reduced to 4-5, adding organic acid to control the pH value in the independent closed circulation loop to be 3-4 for chemical cleaning; during the period, the pH value is measured once every half hour, and according to the change of the pH value and the total hardness, a second pH regulator and organic acid are added in time to control the pH value:
the pickling stage iii may comprise: firstly, adding a corrosion inhibitor; after circulating for 1 hour, adding a third pH regulator into the single closed circulation loop; when the pH value is reduced to 4-5, adding organic acid to control the pH value in the independent closed circulation loop to be 3-4 for chemical cleaning; during the period, the pH value is measured once every half hour, and a third pH regulator and organic acid are added in due time to control the pH value according to the change of the pH value and the total hardness;
wherein the first pH regulator, the second pH regulator and the third pH regulator have the same or different pH values.
The cleaning formula for the air cooler and the cleaning method thereof provided by the embodiment of the invention have the following beneficial effects:
firstly, the invention adopts the technology of combining physical cleaning and chemical cleaning, improves the cleaning effect of the surface evaporation type air cooler and other air coolers, has the descaling rate of over 93 percent, improves the cooling efficiency of the air cooler, and meets the requirements of various production users on the water supply temperature.
Secondly, the invention can form an independent closed circulation loop, realize the control of the whole cleaning process, can clean on line and strengthen the cleaning in short time, improve the efficiency and does not influence the normal operation of other equipment in the water supply system.
In addition, the invention can also improve the circulating water utilization efficiency of each surface evaporation air spray water system, reduce the replacement amount of industrial fresh water, reduce the cost of outsourcing fresh water, save energy and reduce emission.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments 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. In the drawings:
fig. 1 schematically illustrates a cleaning method for an air cooler according to an embodiment of the present invention;
FIG. 2 schematically illustrates a single closed circulation loop utilized in a cleaning method for an air cooler in accordance with an embodiment of the present invention;
FIG. 3 is a graph schematically illustrating a trend of total iron and turbidity change in a sterilization stripping process in a cleaning method for an air cooler according to an embodiment of the present invention;
FIG. 4 is a graph schematically illustrating a change in total hardness of an acid washing stage I in a cleaning method for an air cooler according to an embodiment of the present invention;
FIG. 5 is a schematic diagram showing the pH variation trend of the pickling stage I shown in FIG. 4;
FIG. 6 is a graph schematically illustrating a trend of a total hardness change in a pickling stage II in a cleaning method for an air cooler according to an embodiment of the present invention;
FIG. 7 is a schematic diagram showing the pH shift profile of the pickling stage II shown in FIG. 6;
FIG. 8 is a graph schematically illustrating a trend of a total hardness change in a pickling stage III in a cleaning method for an air cooler according to an embodiment of the present invention; and
FIG. 9 schematically shows a pH variation trend chart of the pickling stage II shown in FIG. 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
Fig. 1 schematically illustrates a cleaning method for an air cooler according to an embodiment of the present invention, and fig. 2 schematically illustrates a single closed circulation loop utilized in the cleaning method for an air cooler according to an embodiment of the present invention.
In one aspect, according to an embodiment of the present invention, there is provided a cleaning formulation for an air cooler 1, wherein the cleaning formulation includes a first mixed chemical for a sterilization stripping stage and a second mixed chemical for a pickling stage, wherein the first mixed chemical includes a bactericide for removing foreign matters attached to the air cooler, an accelerator for enhancing the activity of the cleaner, and an antifoaming agent, and wherein the second mixed chemical includes a corrosion inhibitor for inhibiting corrosion of metals, an inhibitor, an organic acid for cleaning dirt attached to the air cooler, and a pH adjuster.
On the other hand, referring to fig. 1, according to another embodiment of the present invention, there is provided a cleaning method for an air cooler 1, wherein the cleaning method includes the following steps performed in order: firstly, physically cleaning an air cooler; and then, the air cooler is chemically cleaned by timely feeding a cleaning agent included in the cleaning formula for the air cooler into the air cooler.
First, the inventors analyzed the quality of spray water used for the surface evaporation type air cooler and the tube bundle scale sample of the surface evaporation type air cooler.
The results of water quality analysis of a typical spray water used in a surface evaporative air cooler are shown in table 1.
TABLE 1 spray water quality Analyzer
| Serial number | Control item | Spray water | Remarks for |
| 1 | pH | 8.3 | |
| 2 | Total hardness (as CaCO)3Calculated), mg/L | 450 | |
| 3 | Calcium hardness (as CaCO)3Calculated), mg/L | 245 | |
| 4 | Total alkalinity (as CaCO)3Calculated), mg/L | 305 | |
| 5 | Total phosphorus (in PO)4 3-Calculated), mg/L | 0.3 | |
| 6 | Total iron, mg/L | 0.15 | |
| 7 | Turbidity in mg/L | 8.05 | |
| 8 | Total dissolved solids, mg/ |
3000 | |
| 9 | Conductivity us/cm | 3010 |
The results of analysis of a typical tube bundle scale sample for a surface evaporative air cooler are shown in table 2.
TABLE 2 Scale sample Analyzer
Based on the results of the scale analysis shown in table 2, the inventors provided a cleaning solution for air coolers as shown in table 3.
TABLE 3 spray Water circulation System parameters
The cleaning step of the air cooler may include physical cleaning and chemical cleaning.
(1) Physical cleaning of air coolers
Because the air cooler surrounding environment is poor, and the dust is many in the air, consequently, in the easy water system that gets into such as mud thing of a large amount of granule tiny silt, dust, insoluble salts in the air, long-term operation back, the pond bottom of air cooler water system often has a large amount of suspended solids, silt deposit, can't the exhaust. The sludge deposition not only can influence the water quality, but also is a hotbed for the survival and the propagation of anaerobic bacteria.
Therefore, before chemical cleaning, the outer surface of the air cooler, the louver air inlet, salt mud outside the air cooler, the bottom deposit of the pool and the like must be cleaned by a fluid injector such as a high-pressure water gun and the like so as to perform the next chemical cleaning.
(2) Chemical cleaning of air coolers
(i) Before the chemical cleaning, the air cooler is disconnected from other equipment of a water supply system, and then a temporary chemical cleaning device and the air cooler form a single closed circulation loop, wherein the temporary chemical cleaning device comprises a cleaning tank which is positioned at the upstream of the air cooler and is used for providing cleaning liquid, a water collecting tank which is positioned at the downstream of the air cooler and is used for receiving liquid discharged from the air cooler, and a pumping device which is used for enabling the liquid to be in closed circulation among the cleaning tank, the air cooler and the water collecting tank.
(ii) And adding a medicament containing a corrosion inhibitor into the spray water circulating system so that the medicament enters the air cooler along with the circulating water for cleaning.
Under the corrosion inhibition effect of the corrosion inhibitor, the acidity and the complexing effect of acid are utilized to ensure that water scales and corrosion products in an equipment pipeline in the spray water circulating system enter water in an ionic state and a complexing state, and then the cleaned dirt is discharged out of the spray water circulating system through displacement and discharge.
(iii) And in the process of cleaning the air cooler, monitoring the change of the fluid parameters in the air cooler until the related fluid parameters meet the cleaning requirements.
In the process of cleaning the air cooler, the fluid in the air cooler can be sampled, detected and analyzed for many times. Table 4 illustrates the items and frequency of fluid analysis during the air cooler cleaning process.
Table 4:
| analysis item | Frequency of | Remarks for |
| PH | ||
| 1 time/half hour | Controlled between 2-5 | |
| Turbidity of |
1 time/half hour | Judging the cleaning condition |
In the example of table 4, the PH of the fluid in the air cooler may be monitored at all times during the cleaning of the air cooler to be in the range of 2-5, and the sampling frequency may be, for example, 1/half hour; at the same time, the turbidity of the fluid in the air cooler can also be monitored at all times, and the sampling frequency can be 1 time/half hour for example, until the turbidity reaches a preset value.
(3) After the chemical cleaning, the following cleaning data were obtained.
① corrosion coupon data monitored during chemical cleaning are shown in Table 5:
as shown in Table 5, the average corrosion rate of the carbon steel coupon was 1.626g/m2H, less than or equal to 3g/m2H requirement; the average corrosion rate of the copper hanging piece is 0.285g/m2H, less than or equal to 2g/m2H requirement; the average corrosion rate of the stainless steel coupon is 0.171g/m2H, less than or equal to 2g/m2H requirement. The data show that the corrosion rate of each material meets the relevant standard in the chemical cleaning process, the cleaning effect is qualified, and the expected purpose is achieved.
② the rust coupon data during pickling is shown in Table 6:
as can be seen from Table 6, the removal rate of the floating rust of the carbon steel hanging pieces is over 93 percent, the floating rust of the hanging pieces is basically cleaned completely, the expected cleaning purpose is achieved, and the conditions of the floating rust and the scale on the hanging pieces of the system can be effectively improved.
Therefore, according to the cleaning scheme, the method is carried out in a mode of combining physical cleaning and chemical cleaning in the specific implementation process. A cleaning method for the air cooler 1 according to an embodiment of the present invention is described in detail below.
Referring to fig. 2, before the air cooler 1 is chemically cleaned, the air cooler 1 may be disconnected from other equipment of the water supply system, and then a temporary chemical cleaning apparatus may be formed with the air cooler 1 in a separate closed circulation loop. Then, a clean water pump 4 can be adopted to pump the cleaning liquid in the cleaning tank 2 into a spray pipe bundle, and the cleaning liquid enters a water collecting tank 3 through an air cooler 1; then, the cleaning liquid in the water collecting tank 3 is pumped to the cleaning tank 2 by the submersible pump 5, and a single closed circulation loop is formed by circulation.
(1) Physical cleaning
Dredging a nozzle: removing the water collector above the air cooler pipe bundle, cleaning the blocked nozzle, and replacing the damaged nozzle; and (4) washing the tube bundle completely by using a high-pressure water gun, and emphatically cleaning the spraying dead angle.
Cleaning a tube bundle: and cleaning the sediments, water collector fragments and other impurities attached to the tube bundle by using a high-pressure water gun.
Dredging a water collecting tank: the sewage of the collecting tank is discharged, residual sludge and sediments at the bottom of the tank are collected and transported, and the collecting tank is frequently and finally washed, so that the collecting tank has water injection conditions.
(2) Chemical cleaning
① sterilizing and peeling stage
The cleaning process of an air cooler is exemplified. Firstly, taking a water sample in a water collecting tank for receiving liquid discharged from an air cooler for full analysis, and simultaneously, beginning to adjust water pressure to confirm that the water quality meets the cleaning requirement; and then, closing a drain valve, reducing the water supplement amount, reducing the liquid level of the water collecting tank, starting to add 100mg/L of bactericide in an impacting manner, circulating for 1 hour, then adding 100mg/L of bactericide and 100mg/L of stripping agent, and adding the stripping agent and the defoaming agent every half an hour according to the conditions of system foam and turbidity. During the washing process, the iron and turbidity increased, the turbidity increased from 2.67NTU to 19.12NTU, and the total iron in the water increased from 0.16mg/L to 0.89 mg/L. From the cleaning effect, a small amount of yellow dirt is cleaned and stripped off and floats on the surface of the water body, and the effect is obvious.
After the turbidity rises almost stably, the turbidity drops to some extent, and the sterilization and stripping stage is judged to reach the end point, so that replacement can be started.
The main data changes during the sterilization peeling stage are shown in fig. 3. As can be seen from the data shown in FIG. 3 and the response of each ion change curve, the sterilization stripping stage reaches the sterilization stripping cleaning end point within 23 hours, the turbidity of the system is stable, the iron content does not change obviously, then the turbidity of the system gradually decreases, the sterilization stripping cleaning approaches the end point, the water replacement is carried out, and the next step of treatment is carried out.
② Water quality replacement stage
And (5) after the sterilization stripping stage is finished, opening a drain valve to drain, and opening a water replenishing valve to perform water replenishing operation when the liquid level of the spraying water pool is reduced to a low liquid level.
③ chemical cleaning stage for removing rust
The spray water system of the water supply system surface evaporation type air cooler operates under the conditions of high hardness, high conductivity and high pH value for a long time, and the surface of a cooling tube bundle of the spray water system is seriously scaled, so that the heat exchange efficiency of the spray water system is seriously influenced. In order to meet the cleaning requirement, the pickling stage is divided into three stages according to the cleaning effect and the scale testing monitoring result, so that the cleaning effect is effectively ensured, the expected cleaning purpose is achieved, and the running state of the spray water system is improved.
(i) Acid washing stage I
The pickling stage I amounted to 9 hours. Firstly, adding 0.5ppm of corrosion inhibitor; after circulating for 1 hour, adding 3ppm of pH regulator into the system in an impacting manner; when the pH value is reduced to 4-5, sulfamic acid is added to control the pH value of the system to be 3-4 for chemical cleaning; during the period, the pH value is measured once every half hour, and according to the change of the pH value and the total hardness, a pH regulator and sulfamic acid are added in time to control the pH value, so that the cleaning effect is ensured; when the washing is started, the first washing hanging piece is hung. During the cleaning process, the total hardness of the spray water system is increased from 518.36mg/L to 5532mg/L, (5532-518.36) × 2000/1000 ═ 10027.28kg (as CaCO)3Meter).
The general hardness trend of the pickling stage I is shown in FIG. 4, and the pH trend of the pickling stage I is shown in FIG. 5.
(ii) Acid washing stage II
The pickling stage II amounted to 8 hours. Firstly, adding 0.5ppm of corrosion inhibitor; after circulating for 1 hour, 4ppm of pH regulator is added into the system in an impacting manner; when the pH value is reduced to 4-5, sulfamic acid is added to control the pH value of the system to be 3-4 for chemical cleaning; during the period, the pH value is measured once every half hour, and according to the change of the pH value and the total hardness, a pH regulator and sulfamic acid are added in time to control the pH value, so that the cleaning effect is ensured; when the washing is started, a second washing hanging piece is hung. In the cleaning process, the total hardness of the spraying water system is increased from 1825mg/L to 11890mg/L, (8200-2500) × 2000/1000-11400 kg (as CaCO)3Meter).
The general hardness trend of the pickling stage II can be seen in FIG. 6, and the pH trend of the pickling stage II can be seen in FIG. 7.
(iii) Acid washing stage III
The pickling stage III amounted to 10 hours. Firstly, adding 0.5ppm of corrosion inhibitor; after circulating for 1 hour, adding a pH regulator of 4.5 Ppppm into the system in an impacting manner; when the pH value is reduced to 4-5, sulfamic acid is added to control the pH value of the system to be 3-4Performing chemical cleaning work; during the period, the pH value is measured once every half hour, and according to the change of the pH value and the total hardness, a pH regulator and sulfamic acid are added in time to control the pH value, so that the cleaning effect is ensured; when the washing is started, a third washing hanging piece is hung. During the cleaning process, the total hardness of the spray water system is increased from 1825mg/L to 12100mg/L, (12100-1825) × 2000/1000 ═ 20550kg (as CaCO3Meter).
The general hardness trend of pickling stage III is shown in FIG. 8, and the pH trend of pickling stage III is shown in FIG. 9.
In conclusion, the invention can meet the requirement of production users on the temperature of the supplied water, improve the utilization efficiency of the circulating water of the surface evaporation air spray water system, reduce the replacement amount of industrial fresh water, reduce the cost of purchased fresh water, save energy, reduce emission and generate huge environmental benefits. Tests prove that the cleaning agent can effectively clean 114 surface evaporation air coolers of a water supply system, and has an obvious effect; the cooling effect of the air cooler is improved, the water supply temperature can be reduced by 2-3 ℃, and the production requirements of users are met; the replacement amount of the used industrial fresh water and the desalted water caused by the over-standard temperature of the feed water is reduced; the loss of the medicament is reduced; the service life of the equipment is prolonged; in the environment with low temperature in winter, the number of the started fans is reduced, and even the annual cost is saved by millions of yuan.
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A cleaning formula for an air cooler is characterized by comprising a first mixed agent used in a sterilization stripping stage and a second composite acid agent used in an acid cleaning stage, wherein the first mixed agent comprises a bactericide for removing impurities attached to the air cooler, an accelerator for enhancing the activity of a cleaning agent and a defoaming agent, and the second composite acid agent comprises a corrosion inhibitor for inhibiting metal corrosion, an inhibitor, an organic acid for cleaning dirt attached to the air cooler and a pH regulator.
2. The cleaning formulation according to claim 1, wherein the bactericide comprises 90-120 mg/L, the accelerator comprises 90-120 mg/L, and the defoamer is added according to foam conditions, preferably the bactericide comprises 100mg/L, and the accelerator comprises 100 mg/L.
3. The cleaning formulation of claim 1, wherein the corrosion inhibitor comprises 0.3 to 0.7mg/L, the inhibitor comprises 0.1 to 0.5mg/L, the organic acid comprises 2 to 8mg/L, and the pH adjuster comprises 2 to 6mg/L, preferably the corrosion inhibitor comprises 0.5 mg/L.
4. The cleaning formulation of claim 3, wherein the organic acid is sulfamic acid.
5. A cleaning method for an air cooler, characterized by comprising the following steps carried out in order:
firstly, physically cleaning an air cooler; and
next, the air cooler is chemically cleaned by timely feeding a cleaning agent included in the cleaning formulation for an air cooler according to any one of claims 1 to 4 into the air cooler.
6. The cleaning method for an air cooler as set forth in claim 5, wherein the air cooler is disconnected from other equipment of the water supply system before the step of chemically cleaning the air cooler, and then the temporary chemical cleaning device is formed into a separate closed circulation loop with the air cooler.
7. The cleaning method for an air cooler according to claim 6,
the temporary chemical cleaning apparatus comprises a cleaning tank located upstream of the air cooler for supplying a cleaning liquid, a collecting tank located downstream of the air cooler for receiving a liquid discharged from the air cooler, and a pumping means for circulating the liquid between the cleaning tank, the air cooler, and the collecting tank in a closed state, wherein the cleaning liquid comprises a cleaning agent according to claim 5;
preferably, the pumping means comprises: the clear water pump is arranged between the cleaning tank and the air cooler and is used for pumping the cleaning liquid in the cleaning tank to the air cooler; and the submersible pump is arranged between the water collecting tank and the cleaning tank and is used for pumping the cleaning liquid in the water collecting tank to the cleaning tank.
8. The cleaning method for an air cooler according to claim 7, wherein the step of physically cleaning the air cooler comprises:
dredging the air cooler;
cleaning the outer surface of the tube bundle of the air cooler and impurities nearby the outer surface; and
and cleaning a water collecting tank positioned on the downstream of the air cooler to enable the water collecting tank to have a water injection condition.
9. The cleaning method for an air cooler according to claim 8, wherein the step of chemically cleaning the air cooler includes:
a sterilization stripping stage, wherein, firstly, the water sample in the water collecting tank is fully analyzed, then, after the water quality in the water collecting tank is determined to meet the cleaning requirement, a first mixed medicament is timely put into the water collecting tank, and a closed circulation loop is operated to clean the air cooler until the liquid in the water collecting tank meets the requirement;
a water quality replacement stage, wherein after the sterilization stripping stage is finished, sewage in the water collecting tank is discharged, and fresh water is replenished into the water collecting tank;
a descaling chemical cleaning stage comprising a plurality of pickling stages.
10. The cleaning method for an air cooler as claimed in claim 9, wherein the pickling stage includes a pickling stage I, a pickling stage II and a pickling stage III,
preferably, the pickling stage i comprises: firstly, adding a corrosion inhibitor; after circulating for 1 hour, adding a first pH regulator into the independent closed circulation loop, and when the pH value is reduced to 4-5, adding organic acid to control the pH value in the independent closed circulation loop to be 3-4 for chemical cleaning; during the period, the pH value is measured once every half hour, and a first pH regulator and organic acid are added in due time to control the pH value according to the change of the pH value and the total hardness;
the acid washing stage II comprises: firstly, adding a corrosion inhibitor; after circulating for 1 hour, adding a second pH regulator into the single closed circulation loop; when the pH value is reduced to 4-5, adding organic acid to control the pH value in the independent closed circulation loop to be 3-4 for chemical cleaning; during the period, the pH value is measured once every half hour, and according to the change of the pH value and the total hardness, a second pH regulator and organic acid are added in time to control the pH value:
the pickling stage III comprises: firstly, adding a corrosion inhibitor; after circulating for 1 hour, adding a third pH regulator into the single closed circulation loop; when the pH value is reduced to 4-5, adding organic acid to control the pH value in the independent closed circulation loop to be 3-4 for chemical cleaning; during the period, the pH value is measured once every half hour, and a third pH regulator and organic acid are added in due time to control the pH value according to the change of the pH value and the total hardness;
wherein the first pH regulator, the second pH regulator and the third pH regulator have the same or different pH values.
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