CN116481373A - Method for cleaning cooling equipment tube bundle - Google Patents
Method for cleaning cooling equipment tube bundle Download PDFInfo
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- CN116481373A CN116481373A CN202310409595.5A CN202310409595A CN116481373A CN 116481373 A CN116481373 A CN 116481373A CN 202310409595 A CN202310409595 A CN 202310409595A CN 116481373 A CN116481373 A CN 116481373A
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- 238000004140 cleaning Methods 0.000 title claims abstract description 161
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000001816 cooling Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 199
- 239000000126 substance Substances 0.000 claims abstract description 41
- 230000002829 reductive effect Effects 0.000 claims abstract description 33
- 239000002253 acid Substances 0.000 claims description 43
- 238000005260 corrosion Methods 0.000 claims description 41
- 230000007797 corrosion Effects 0.000 claims description 41
- 238000005406 washing Methods 0.000 claims description 36
- 239000007788 liquid Substances 0.000 claims description 22
- 239000007921 spray Substances 0.000 claims description 20
- 230000008859 change Effects 0.000 claims description 19
- 239000003112 inhibitor Substances 0.000 claims description 19
- 230000001954 sterilising effect Effects 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 239000006260 foam Substances 0.000 claims description 16
- 230000001502 supplementing effect Effects 0.000 claims description 14
- 150000001875 compounds Chemical class 0.000 claims description 13
- 238000005554 pickling Methods 0.000 claims description 13
- 238000004659 sterilization and disinfection Methods 0.000 claims description 13
- 230000000844 anti-bacterial effect Effects 0.000 claims description 12
- 239000003899 bactericide agent Substances 0.000 claims description 12
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims description 12
- 238000004458 analytical method Methods 0.000 claims description 11
- 239000013049 sediment Substances 0.000 claims description 9
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 8
- 239000002518 antifoaming agent Substances 0.000 claims description 8
- 239000010962 carbon steel Substances 0.000 claims description 8
- 239000013530 defoamer Substances 0.000 claims description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 238000011161 development Methods 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims description 5
- 239000010802 sludge Substances 0.000 claims description 5
- 239000012634 fragment Substances 0.000 claims description 4
- 239000010865 sewage Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 30
- 239000003814 drug Substances 0.000 abstract description 7
- 239000013505 freshwater Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 238000001704 evaporation Methods 0.000 description 14
- 230000008020 evaporation Effects 0.000 description 14
- 230000001276 controlling effect Effects 0.000 description 12
- 238000012544 monitoring process Methods 0.000 description 7
- 239000012459 cleaning agent Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 238000012546 transfer Methods 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 241000195493 Cryptophyta Species 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000536 complexating effect Effects 0.000 description 2
- 238000010668 complexation reaction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000012412 chemical coupling Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002826 nitrites Chemical class 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000003206 sterilizing agent Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 1
Classifications
-
- 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
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/04—Apparatus for cleaning or pickling metallic material for cleaning pipes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention relates to the technical field of water treatment, in particular to a method for cleaning a cooling equipment tube bundle, which comprises the following steps: step one: physical cleaning; step two: and (5) chemical cleaning. After the project is implemented, the effect is good, and the benefit is obvious: the cooling effect of the air cooler is improved, and the water supply temperature is reduced by 2-3 ℃; the replacement amount of industrial fresh water and desalted water is reduced due to the fact that the temperature of the water supply exceeds the standard; the loss of the medicament is reduced; meanwhile, the service life of the equipment is prolonged; the number of fans which are started is reduced in an environment with low temperature in winter; the annual saving cost is 705 ten thousand yuan.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a method for cleaning a cooling equipment tube bundle.
Background
Along with the development of the production situation of the Tai steel, the improvement of the product quality becomes the focus of attention of each production user, the requirement of the user is met, and the realization of high-quality service becomes the primary task of energy department safety and supply. However, the water supply temperature and the water quality (mainly hardness) of the water supply system are obviously contradictory in summer, on one hand, the cooling effect is affected due to the scaling phenomenon of the tube bundles of the evaporative air cooler on the surface of the cooling equipment, and the phenomenon that the user demand cannot be met is caused, on the other hand, in order to ensure the water supply temperature, the water supply system is forced to increase the industrial new water quantity for replacement, so that the energy consumption and the purchasing cost are increased, and the completion of the new water index of the ton steel consumption of the company is directly affected. In order to meet the water temperature requirement of users, the surface evaporation air cooler tube bundles need to be cleaned regularly every year, but the conventional cleaning technology is limited by the air cooler structure, the cleaning water pressure, the water quality and other conditions and cannot be thoroughly cleaned.
Developing a surface evaporation air cooler cleaning technology, optimizing a cleaning agent formula, improving a cleaning effect, reducing the water supply temperature to the maximum extent and meeting the production requirement is the problem to be solved by the method.
Disclosure of Invention
The object of the present invention is to solve the above problems and to provide a method for cleaning a bundle of cooling devices.
The purpose of the invention is realized in the following way: a method of cleaning a cooling apparatus tube bundle comprising the steps of: step one: and (3) physical cleaning: (1) dredging nozzle: removing a water collector above the tube bundle, cleaning the blocked nozzles, replacing the damaged nozzles, flushing the tube bundle above by using a high-pressure water gun, and cleaning the spray dead angle with emphasis; (2) cleaning the tube bundle: cleaning the sediment, the water collector fragments and other sundries attached to the tube bundle by using a high-pressure water gun; (3) sump dredging: sewage in the water collecting tank is discharged, residual sludge and sediment at the bottom of the tank are collected and conveyed, and the water collecting tank is frequently and finally washed, so that the water filling condition is achieved; step two: chemical cleaning: (1) sterilizing and stripping: taking a water sample in a water collecting tank of an air cooler for full analysis, simultaneously starting to adjust the water pressure to 0.25-0.4Mpa, confirming that the PH of water quality reaches 2-5, closing a drain valve, reducing the water supplementing amount, reducing the water level in the water collecting tank, starting to add 100-125mg/L of bactericide, recycling for 1-2.5 hours, adding 100-130mg/L of bactericide and 100-130mg/L of stripper, and adding stripper and defoamer according to the foam and turbidity conditions of the water collecting tank every half hour; the turbidity starts to decrease after rising stably, the sterilization stripping process reaches the end point, replacement is started, and the replacement time is 22-24 hours; (2) water quality replacement stage: after the sterilization stripping stage is finished, a blow-down valve is opened for blow-down, and when the liquid level of the spray pool is reduced to a low liquid levelOpening a water supplementing valve to supplement water with the water supplementing amount of 230-300m 3 Reaching the high liquid level of the spray pool of 3m-4.5m; (3) a rust removal scale chemical cleaning stage: 1) Acid washing stage I: adding corrosion inhibitor with concentration of 0.3ppm-0.6ppm after acid washing for 8-10 hours, adding pH regulator with concentration of 3-5ppm to the water collecting tank after circulation for 1-2.5 hours, when the pH value is reduced to 4-5, adding compound acid to control the pH value of the water collecting tank to 3-4 for chemical cleaning, measuring the pH value once every 0.5h-1h during the period, controlling the pH value by adding the pH regulator and the compound acid according to the pH value and the total hardness change, controlling the pH value to 3-4, hanging into a cleaning hanging piece at the beginning of cleaning, and obtaining a uniform and compact corona film layer on the surface of the hanging piece after pre-film preparation by using the required CuSO 4 Detecting the solution, titrating the solution at different positions on the front side and the back side respectively for 2 times, wherein the color development time of the carbon steel hanging piece is more than or equal to 7s; 2) Acid washing stage II: adding corrosion inhibitor with concentration of 0.35-0.55ppm after acid washing is performed for 7-8.5 hours, adding pH regulator with concentration of 3.5-5.5ppm to the water collecting tank in an impact manner after circulation for 1-2.5 hours, adding composite acid to control the pH value of the water collecting tank to be 3-4 for chemical cleaning when the pH value is reduced to 4-5, measuring the pH value once every 0.5-1 hour during the chemical cleaning, controlling the pH value to be 3-4 according to the pH value and the total hardness change, and hanging the water collecting tank into a cleaning hanging piece when the cleaning is started; 3) Acid washing stage III: adding corrosion inhibitor with concentration of 0.4-0.6ppm after 8.5-11 hours in total in the third stage of pickling, adding pH regulator with concentration of 4-5.5Pppm to the water collecting tank in an impact way after circulating for 1-2 hours, when the pH value is reduced to 4-5, adding compound acid to control the pH value of the water collecting tank to 3-4 for chemical cleaning, measuring the pH value once every 0.5-1 hour during the period, controlling the pH value of the water collecting tank to 3-4 according to the pH value and the total hardness change, and hanging the water collecting tank into a cleaning hanging piece during the period.
And in the second step, stripping agent and defoaming agent are added every half an hour according to the foam and turbidity conditions of the water collecting tank, specifically, the defoaming agent is added after the water collecting tank cleaning water is foamed, and the stripping agent with the concentration of 100-130mg/L is added when the turbidity of the water collecting tank cleaning water is monitored to be 10-30 mg/L.
The three-stage acid washing of the second step adopts compound acid for washing, wherein the compound acid is mixed solution of sulfamic acid and sulfuric acid, and the adding concentration is 3-6mg/L and 0.5-1mg/L respectively.
After the cleaning is finished, adding a PH regulator into the water collecting tank to regulate the PH value of the water to 7-9.
The beneficial effects of the invention are as follows: after the project is implemented, the effect is good, and the benefit is obvious: the cooling effect of the air cooler is improved, and the water supply temperature is reduced by 2-3 ℃; the replacement amount of industrial fresh water and desalted water is reduced due to the fact that the temperature of the water supply exceeds the standard; the loss of the medicament is reduced; meanwhile, the service life of the equipment is prolonged; the number of fans which are started is reduced in an environment with low temperature in winter; the annual saving cost is 705 ten thousand yuan.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a flow chart of the washing water of the present invention.
Fig. 2 is a process flow diagram of air cooler cleaning.
FIG. 3 is a graph showing turbidity and iron change during sterilization stripping.
FIG. 4 is a graph showing the total hardness change trend in the pickling stage I.
FIG. 5 is a graph showing the pH change trend in the pickling stage I.
FIG. 6 is a graph showing the total hardness change trend in the pickling stage II.
FIG. 7 is a graph showing the pH change trend during the pickling stage II.
FIG. 8 is a graph showing the total hardness change trend in the pickling III stage.
FIG. 9 is a graph showing pH and total iron change trend during pickling III.
Detailed Description
A method of cleaning a cooling apparatus tube bundle comprising the steps of: step one: and (3) physical cleaning: (1) dredging nozzle: removing a water collector above the tube bundle, cleaning the blocked nozzles, replacing the damaged nozzles, flushing the tube bundle above by using a high-pressure water gun, and cleaning the spray dead angle with emphasis; (2) cleaning the tube bundle: cleaning the sediment, the water collector fragments and other sundries attached to the tube bundle by using a high-pressure water gun; (3) sump dredging: sewage in the water collecting tank is discharged, and residual sludge and sediment at the bottom of the tank are collectedThe water collecting tank is collected, pulled and transported, and is frequently and finally washed, so that the water collecting tank has water injection conditions; step two: chemical cleaning: (1) sterilizing and stripping: taking a water sample in a water collecting tank of an air cooler for full analysis, simultaneously starting to adjust the water pressure to 0.25-0.4Mpa, confirming that the PH of water quality reaches 2-5, closing a drain valve, reducing the water supplementing quantity, reducing the liquid level of the water collecting tank, starting to add 100-125mg/L of bactericide, recycling for 1-2.5 hours, adding 100-130mg/L of bactericide and 100-130mg/L of stripper, adding the stripper and the defoamer every half hour according to the foam and turbidity condition of the water collecting tank, specifically adding the defoamer when a large amount of foam appears on the surface of the water collecting tank, wherein the defoamer is the foam breaker, namely, the defoamer is added after the water collecting tank is foamed, enters a foam membrane through the action of absorbing foam and surface tension to enable the foam membrane to be thinned, rapidly destroy the foam, reducing the liquid level, and the components of the defoamer are mainly active components, emulsifiers and the like. Monitoring the turbidity of the water in the water collecting tank to be 10-30mg/L, adding a stripping agent with the concentration of 100-130mg/L, wherein the stripping agent can be a reagent for stripping organisms and slime generated by the organisms from the surface of the air cooler tube bundle, and the main components of the reagent are quaternary ammonium salt and the like; after the turbidity rises steadily, the turbidity starts to decline, the sterilization stripping process reaches the end point, and replacement is started; the replacement time is 22h-24h; (2) water quality replacement stage: after the sterilization stripping stage is finished, a blow-down valve is opened for blow-down, and when the liquid level of the spray pool is reduced to a low liquid level, a water supplementing valve is opened for water supplementing operation, namely, the water supplementing amount is 230-300m 3 Reaching the high liquid level of the spray pool of 3m-4.5m; (3) a rust removal scale chemical cleaning stage: 1) Acid washing stage I: adding corrosion inhibitor with concentration of 0.3ppm to 0.6ppm in total in the acid washing stage I for 8 to 10 hours, adding pH regulator with concentration of 3ppm to 5ppm in impact to a water collecting tank after circulating for 1 to 2.5 hours, when the pH value is reduced to 4 to 5, adding sulfamic acid to control the pH value of the water collecting tank to 3 to 4 for chemical cleaning, measuring the pH value every 0.5 to 1 hour during the period, controlling the pH value by adding the pH regulator and sulfamic acid according to the pH value and the total hardness change, controlling the pH value to 2.5 to 4 during the period, and hanging a cleaning hanging piece (the hanging piece is a device for monitoring equipment corrosion) at the beginning of cleaning, and judging whether the effectiveness of the cleaning agent addition and the cleaning effect are qualified or not by monitoring the corrosion degree of the hanging piece in the water collecting tank added with the chemical agent, wherein the hanging piece is made of carbon steel or stainless steelCopper, monitoring corrosion rate control: the corrosion rate of the carbon steel hanging piece is 0-3g/m < 2 >. H, the corrosion rate of the copper hanging piece is 0-2g/m < 2 >. H, the corrosion rate of the stainless steel hanging piece is 0-2g/m < 2 >. H), the surface of the hanging piece is required to be provided with a uniform and compact halation film layer after being pre-coated, and the required CuSO is used 4 Detecting the solution, titrating the solution at different positions on the front side and the back side respectively for 2 times, wherein the color development time of the carbon steel hanging piece is more than or equal to 7s; 2) Acid washing stage II: adding corrosion inhibitor with concentration of 0.35-0.55ppm after acid washing is performed for 7-8.5 hours, adding pH regulator with concentration of 3.5-5.5ppm to the water collecting tank in an impact manner after circulation for 1-2.5 hours, controlling the pH value of the water collecting tank to be 3-4 for chemical cleaning when the pH value is reduced to 4-5, measuring the pH value once every 0.5-1 hour during the chemical cleaning operation, controlling the pH value to be 3-4 during the chemical cleaning operation according to the pH value and the total hardness change, and hanging cleaning hanging pieces when the cleaning operation is started; 3) Acid washing stage III: and (3) after the acid washing stage III is started to add corrosion inhibitor with the concentration of 0.4-0.6ppm for 8.5-11 hours, and the pH regulator with the concentration of 4-5.5Pppm is added to the water collecting tank in an impact manner after 1-2 hours, when the pH value is reduced to 4-5, sulfamic acid is added to control the pH value of the water collecting tank to 3-4 for chemical washing, the pH value is measured once every 0.5-1 hour during the washing stage III, the pH value is controlled to 3-4 according to the pH value and the total hardness change, the pH regulator and sulfamic acid are added during the washing stage II, and the washing hanging piece is hung at the beginning of washing (the hanging piece is a device for monitoring the corrosion of equipment) and judging whether the effectiveness and the washing effect of the washing agent are qualified or not by monitoring the corrosion degree of the hanging piece put into the water collecting tank to which the washing agent is added, the hanging piece is made of carbon steel, stainless steel and copper, and the corrosion rate is monitored to be 0-3g/m < 2 >, the corrosion rate of the copper hanging piece is monitored to be 0-2g/m < 2 >, and the corrosion rate of the copper hanging piece is monitored to be 0-2g/m < 2 >.
And step two, sterilizing and stripping, namely cleaning by adopting a mixed medicament of a bactericide, an accelerator (stripping agent) and a defoaming agent. The bactericide and the stripping agent are agents for stripping slime formed by slime, bacteria and algae and the like which are bred on the surfaces of the air cooler tube bundles, and the main components of the bactericide and the stripping agent are quaternary ammonium salts and the like, and the adding concentration is 100-120mg/L. The defoaming agent is a foam breaker, namely, the cleaning water of the water collecting tank is added after foaming, and enters the foam membrane to be thinned through the action of adsorption foam and surface tension, so that the foam is quickly broken, the liquid level is reduced, and the components of the defoaming agent mainly comprise active components, emulsifying agents and the like.
The three-stage acid washing of the second step adopts compound acid for washing, the compound acid is mixed solution of sulfamic acid and sulfuric acid, the adding concentration is respectively 3-6mg/L and 0.5-1mg/L, and the corrosion inhibitor is used for inhibiting the corrosion of the metal body, and the main components are phosphate, hydroxide and the like. As the concentration of Fe < 3+ > exceeds a certain limit, the corrosion of the tube bundle can be accelerated, and the inhibitor is an agent for inhibiting Fe < 3+ > and is added with the concentration of 0.2-0.3mg/L, chromates, nitrites and the like. The acid is a reagent for cleaning the scale attached to the tube bundle, and the PH regulator is used for cleaning by regulating the PH value of water to be 7-9) in a normal running state after the cleaning is finished.
The invention aims to solve the problems of optimizing the formula of cleaning agents, improving the cleaning effect, reducing the water supply temperature to the maximum extent and meeting the production requirement by researching and analyzing the composition of scale sample components of a surface evaporation air cooler.
The surface evaporation air cooler is a new energy-saving cooling circulating water cooling equipment, and is mainly characterized by that it utilizes the evaporation of water film outside tube bundle to intensify heat transfer outside tube, and its working process is characterized by that the circulating cooling water in the pool of lower portion of equipment is fed into spray distributor positioned on the horizontally placed tube bundle by means of water pump, and the distributor can spray the cooling water downwards onto the surface of heat-transferring tube so as to make the outer surface of tube form continuous uniform thin water film; simultaneously, air is sucked from the lower air suction window by a fan, so that the air flows from bottom to top and is transversely swept across the tube bundle which is horizontally arranged. At this time, the heat transfer outside the tube of the heat transfer tube not only depends on the sensible heat transfer between the water film and the air, but also absorbs a large amount of heat by the rapid evaporation of the water film on the outer surface of the tube bundle, thereby strengthening the heat transfer outside the tube.
The surface evaporation air cooler is structurally characterized in that the cooler and the heat exchanger are integrated, a separate circulating water cooling system is omitted, the occupied area of equipment is reduced, the light pipe is adopted as a heat transfer pipe, the one-time investment is greatly reduced, on the other hand, the air resistance is small due to the fact that the light pipe is adopted by the department evaporation air cooler, the required air quantity is small, the cooling water is recycled in the equipment, the evaporation consumption of the water is low, and the operation cost is reduced accordingly.
The results of the surface evaporation air cooler spray water quality analysis are shown in the following table.
TABLE 1 spray water quality analysis meter
| Sequence number | Control item | Spray water | Remarks |
| 1 | pH | 8.3 | |
| 2 | Total hardness (calculated as CaCO 3), mg/L | 450 | |
| 3 | Calcium hardness (calculated as CaCO 3), mg/L | 245 | |
| 4 | Total alkalinity (calculated as CaCO 3), mg/L | 305 | |
| 5 | Total phosphorus (as PO 43) － Meter), mg/L | 0.3 | |
| 6 | Total iron, mg/L | 0.15 | |
| 7 | Turbidity, mg/L | 8.05 | |
| 8 | Total dissolved solids, mg/L | 3000 | |
| 9 | Conductivity, us/cm | 3010 |
The surface evaporation air cooler tube bundle scale was analyzed as follows.
TABLE 2 Scale analysis Table
According to the analysis result of the scale, the air cooler cleaning technical scheme is proposed as follows.
Table 3 wash water system parameters
| Project | Unit (B) | Data | Remarks |
| Total circulating water quantity | m 3 /h | 18000 | |
| Total retained water (containing pipe) | 3 | 6000 | |
| Heat exchange tube and equipment body material | Stainless steel, carbon steel | ||
| Water pump material (impeller, pump shell) | Cast iron |
1. Physical cleaning of air cooler
Because the surrounding environment of the air cooler is poor, dust in the air is much, a large amount of silt, dust, mud-like matters of insoluble salts and the like with fine particles in the air enter the water collecting tank, and the water tank of the air cooler runs for a long time, and a large amount of suspended matters and silt are deposited at the bottom of the water tank of the water system of the air cooler and cannot be discharged. Sludge deposition not only affects water quality, but also is a warm bed for anaerobic bacteria survival and reproduction. Therefore, before chemical cleaning, the external surface of the air cooler, the air inlets of the shutters, the salt mud outside the pipes and the sediment at the bottom of the tank must be cleaned by a high-pressure water gun so as to carry out chemical cleaning in the next step.
2. Chemical cleaning of air cooler
Under the corrosion inhibition effect of the corrosion inhibitor, scale and corrosion products in equipment pipelines in the water collecting tank enter water in an ionic state and a complexing state by utilizing the acidity and complexing effect of acid, and then the cleaned dirt is discharged out of the water collecting tank through displacement and discharge.
3. Analysis items and frequency in the cleaning process
| Analysis item | Frequency of | Remarks |
| PH | 1 time/half hour | Controlled between 2 and 5 |
| Turbidity degree | 1 time/half hour | Judging the cleaning condition |
4. Cleaning agent formula
(1) The sterilizing and stripping process adopts the mixed medicament of sterilizing agent, accelerator (stripping agent) and defoaming agent for cleaning. The bactericide is used for removing algae and fungus substances on the tube bundle, the promoter is used for enhancing the activity of the cleaning agent, and the concentrations of the various agents are respectively shown in the following table.
The medicine proportion of each stage
(2) The pickling adopts compound acid for cleaning, and a corrosion inhibitor, an acid and a PH regulator are used for cleaning. Corrosion inhibitor is used to inhibit corrosion of metal body due to Fe 3+ The concentration exceeds a certain limit, which accelerates the corrosion of the tube bundle, so that Fe is added into the cleaning agent 3+ The inhibitor, organic acid is the scale attached to the cleaning tube bundle, and the PH regulator is used for regulating the water quality to a normal running state after the cleaning is finished.
5. The chemical cleaning flow is innovatively optimized, the physical and chemical coupling cleaning technology is adopted, the cleaning effect is improved, the descaling rate reaches more than 93%, and the cooling efficiency of the surface evaporation air cooler is improved. Based on the traditional physical cleaning, the structural characteristics of the evaporative air cooler and the test analysis results of the tube bundle scale are combined, and the efficient chemical cleaning technology is adopted, namely under the corrosion inhibition effect of the corrosion inhibitor, the acid and complexation effect of the acid are utilized to enable the scale and corrosion products of the tube bundle of the surface evaporative air cooler to enter water in an ionic state and a complexation state, and then the cleaned dirt is discharged out of the water collecting tank through displacement and discharge, so that the cleaning effect is achieved. And a cleaning full-flow control technology is innovated, so that on-line cleaning short-time enhanced cleaning is realized, and the efficiency is improved. Before chemical cleaning, firstly closing a water valve at the passing position of the cleaned air cooler and accessing temporary equipment: the cleaning pump drives the cleaning liquid in the cleaning tank into the spray tube bundle, the cleaning liquid enters the water collecting tank through the air cooler, the cleaning liquid is pumped to the cleaning tank through the submersible pump, and the cleaning liquid is circulated to form an independent closed circuit, so that the normal operation of other equipment is not influenced, and the full-flow control can be realized.
6. The whole process is cleaned, thereby achieving the purpose of improving the cooling effect of the air cooler.
Further, 1. Because there is no separate process system for air cooler cleaning, the water valve through which the air cooler is cleaned is first closed and then connected to temporary equipment prior to chemical cleaning: the cleaning pump drives the cleaning liquid in the cleaning tank into the spray tube bundle, the cleaning liquid enters the water collecting tank through the air cooler, the cleaning liquid is pumped to the cleaning tank through the submersible pump, and the cleaning liquid is circulated to form an independent closed circuit, so that the normal operation of other equipment is not influenced, and the full-flow control can be realized. 2. In the cleaning process, the physical cleaning stage is only carried out under pressure. 3. In the chemical cleaning stage, different composite medicaments are added into the cleaning water in different cleaning stages, so that the effect of thoroughly stripping dirt of the tube bundle is achieved.
The invention has the following implementation effects.
1. Corrosion coupon data were monitored during chemical cleaning as follows.
Remarks: the average corrosion rate of the carbon steel hanging piece is 1.626g/m 2 H, less than or equal to 3g/m 2 H, the average corrosion rate of the copper hanging piece is 0.285g/m 2 H, less than or equal to 2g/m 2 H, average corrosion rate of the stainless steel hanging piece is 0.171g/m 2 H, less than or equal to 2g/m 2 H requirement.
The corrosion rate of each material in the cleaning process accords with the relevant standard, the cleaning effect is qualified, and the expected purpose is achieved.
2. The data for the scale hanging pieces during pickling are shown in the following table.
The floating rust removal rate of the hanging piece reaches more than 93 percent, the floating rust on the hanging piece is basically and completely cleaned, the expected cleaning purpose is achieved, the conditions of the floating rust and the scale on the hanging piece of the water collecting tank can be effectively improved,
after the project is implemented, the effect is good, and the benefit is obvious: the cooling effect of the air cooler is improved, and the water supply temperature is reduced by 2-3 ℃; the replacement amount of industrial fresh water and desalted water is reduced due to the fact that the temperature of the water supply exceeds the standard; the loss of the medicament is reduced; meanwhile, the service life of the equipment is prolonged; the number of fans which are started is reduced in an environment with low temperature in winter; the annual saving cost is 705 ten thousand yuan.
Because the traditional cleaning method can not achieve the cleaning effect, the method is carried out in a physical and chemical combination mode in the specific implementation process according to the cleaning scheme.
1. Physical cleaning
Dredging the nozzle: removing the water collector above the tube bundle, cleaning the blocked nozzles, and replacing the damaged nozzles; the tube bundles above are washed by using a high-pressure water gun, and spray dead angles are cleaned seriously.
Cleaning a tube bundle: and cleaning the sediment, the water collector fragments and other sundries attached to the tube bundle by using a high-pressure water gun.
Dredging the water collecting tank: sewage in the water collecting tank is discharged, residual sludge and sediment at the bottom of the tank are collected and conveyed, the water collecting tank is usually and finally washed, and the water injection condition is achieved.
2. Chemical cleaning
Sterilizing and stripping machine
Taking a water sample in a water collecting tank of an air cooler for full analysis, simultaneously starting to adjust the water pressure, confirming that the water quality meets the cleaning requirement, closing a drain valve, reducing the water supplementing amount, reducing the water level in the water collecting tank, starting to add 100mg/L of bactericide in an impact manner, adding 100mg/L of bactericide after 1 hour of circulation, and adding 100mg/L of stripping agent every half hour according to the foam and turbidity conditions of the water collecting tank during the period. In the cleaning process, the iron and the turbidity are both increased, the turbidity is increased from 2.67NTU to 19.12NTU, and the total iron in water is increased from 0.16mg/L to 0.89mg/L. From the perspective of the cleaning effect, a small amount of yellow dirt is cleaned and peeled off and floats on the surface of the water body, and the effect is obvious.
After the turbidity increased substantially stabilized, the turbidity decreased to determine that the sterilization/peeling process had reached the end point, and replacement was started.
The main data changes in the sterilization peel stage are shown in fig. 3.
The sterilization stripping stage is characterized in that the sterilization stripping cleaning end point is reached in 23 hours according to the data and the reaction of each ion change curve, the turbidity of the water collecting tank is stable and the iron content is not obviously changed, then the turbidity of the water collecting tank is gradually reduced, the sterilization stripping cleaning is close to the end point, and the replacement water enters the next treatment.
Water quality replacement stage
And after the sterilization stripping stage is finished, opening a blow-down valve for blow-down, and opening a water supplementing valve for water supplementing operation when the liquid level of the spray pool is reduced to a low liquid level.
Third step of chemical cleaning of rust and scale
The spray water system of the surface evaporation air cooler of the water system runs for a long time under the conditions of high hardness, high conductivity and high pH value, and the surface of a cooling tube bundle of the system is seriously scaled, so that the heat exchange efficiency of the system is seriously affected. In order to meet the cleaning requirement, the pickling stage is divided into 3 stages according to the cleaning effect and the scale test monitoring result, so that the cleaning effect is effectively ensured, the expected cleaning purpose is achieved, and the running state of the system is improved.
(4) Acid washing stage I
The total time of the acid washing stage I is 9 hours. Adding 0.5ppm of corrosion inhibitor, circulating for 1 hour, adding 3ppm of pH regulator to the water collecting tank in an impact manner, and controlling the pH value of the water collecting tank to be 3-4 for chemical cleaning when the pH value is reduced to 4-5 by adding sulfamic acid, wherein the pH value of the water collecting tank is controlled to be 3-4 every half hourAnd (3) measuring the pH value once, and adding a pH regulator and sulfamic acid to control the pH value according to the pH value and the total hardness change, so as to ensure the cleaning effect and hanging the cleaning hanging piece at the beginning of cleaning. The total hardness of the water collecting tank during the cleaning process is increased from 518.36mg/L to 5532mg/L, (5532-518.36) 2000/1000= 10027.28kg (CaCO) 3 Meter).
(5) Acid washing stage II
The pickling phase II takes 8 hours. Adding 0.5ppm of corrosion inhibitor, circulating for 1 hour, adding 4ppm of pH regulator to the water collecting tank in an impact manner, controlling the pH value of the water collecting tank to be 3-4 for chemical cleaning when the pH value is reduced to 4-5, measuring the pH value every half hour during the chemical cleaning, controlling the pH value by adding the pH regulator and the sulfamic acid according to the pH value and the total hardness change during the chemical cleaning, ensuring the cleaning effect, and hanging the cleaning hanging piece at the beginning of cleaning. The total hardness of the water collecting tank during the cleaning process is increased from 1825mg/L to 11890mg/L, (8200-2500) 2000/1000=11400 kg (CaCO) 3 Meter).
(4) Acid washing stage III
The pickling stage III takes 10 hours in total. Adding 0.5ppm of corrosion inhibitor, circulating for 1 hour, adding 4.5Pppm of pH regulator to the water collecting tank in an impact manner, when the pH value is reduced to 4-5, adding sulfamic acid to control the pH value of the water collecting tank to 3-4 for chemical cleaning, measuring the pH value once every half hour during the chemical cleaning, controlling the pH value according to the pH value and the total hardness, adding the pH regulator and the sulfamic acid during the chemical cleaning, ensuring the cleaning effect, and hanging a cleaning hanging piece at the beginning of cleaning. The total hardness of the sump during washing increased from 1825mg/L to 12100mg/L, (12100-1825) 2000/1000= 20550kg (as CaCO) 3 Meter).
The equipment cleaned by the method has 54 times and good effect. The implementation of the project meets the requirements of all production users of the Tai steel on the water supply temperature, improves the recycling efficiency of the spray water system of all surface evaporation air coolers, reduces the replacement amount of industrial fresh water, can reduce the cost of outsourcing fresh water, makes positive contribution to energy conservation and emission reduction, environment improvement, recycling economy and green development, generates huge environmental benefits, provides a safe, stable, reliable and economic process method for the efficient chemical treatment of the tube bundle scaling of the industrial air coolers, and plays an demonstration role. Has good popularization value in the field of water treatment.
The above embodiments are merely examples of the present invention, but the present invention is not limited to the above embodiments, and any changes or modifications within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (4)
1. A method of cleaning a bundle of cooling apparatus, characterized by: the method comprises the following steps:
step one: and (3) physical cleaning: (1) dredging nozzle: removing a water collector above the tube bundle, cleaning the blocked nozzles, replacing the damaged nozzles, flushing the tube bundle above by using a high-pressure water gun, and cleaning the spray dead angle with emphasis; (2) cleaning the tube bundle: cleaning the sediment, the water collector fragments and other sundries attached to the tube bundle by using a high-pressure water gun; (3) sump dredging: sewage in the water collecting tank is discharged, residual sludge and sediment at the bottom of the tank are collected and conveyed, and the water collecting tank is frequently and finally washed, so that the water filling condition is achieved;
step two: chemical cleaning: (1) sterilizing and stripping: taking a water sample in a water collecting tank of an air cooler for full analysis, simultaneously starting to adjust the water pressure to 0.25-0.4Mpa, confirming that the PH of water quality reaches 2-5, closing a drain valve, reducing the water supplementing amount, reducing the water level in the water collecting tank, starting to add 100-125mg/L of bactericide, recycling for 1-2.5 hours, adding 100-130mg/L of bactericide and 100-130mg/L of stripper, and adding stripper and defoamer according to the foam and turbidity conditions of the water collecting tank every half hour; the turbidity starts to decrease after rising stably, the sterilization stripping process reaches the end point, replacement is started, and the replacement time is 22-24 hours; (2) water quality replacement stage: after the sterilization stripping stage is finished, a blow-down valve is opened for blow-down, when the liquid level of the spray pool is reduced to a low liquid level, a water supplementing valve is opened for water supplementing operation, and the water supplementing amount is 230-300m 3 Reaching the high liquid level of the spray pool of 3m-4.5m; (3) a rust removal scale chemical cleaning stage: 1) Acid washing stage I: the total acid washing period I is 8-10 hours, and the concentration is 0.3ppm-0.6ppm corrosion inhibitor, after circulating for 1-2.5 hours, adding pH regulator with the concentration of 3-5ppm to the water collecting tank in an impact manner, when the pH value is reduced to 4-5, adding compound acid to control the pH value of the water collecting tank to 3-4 for chemical cleaning, measuring the pH value every 0.5-1 hour during the period, according to the pH value and the total hardness change, adding pH regulator and compound acid to control the pH value during the period, controlling the pH value to 3-4, hanging a cleaning hanging piece at the beginning of cleaning, wherein the surface of the hanging piece is provided with a uniform and compact halation film layer after the pre-film, and the required CuSO is used 4 Detecting the solution, titrating the solution at different positions on the front side and the back side respectively for 2 times, wherein the color development time of the carbon steel hanging piece is more than or equal to 7s; 2) Acid washing stage II: adding corrosion inhibitor with concentration of 0.35-0.55ppm after acid washing is performed for 7-8.5 hours, adding pH regulator with concentration of 3.5-5.5ppm to the water collecting tank in an impact manner after circulation for 1-2.5 hours, adding composite acid to control the pH value of the water collecting tank to be 3-4 for chemical cleaning when the pH value is reduced to 4-5, measuring the pH value once every 0.5-1 hour during the chemical cleaning, controlling the pH value to be 3-4 according to the pH value and the total hardness change, and hanging the water collecting tank into a cleaning hanging piece when the cleaning is started; 3) Acid washing stage III: adding corrosion inhibitor with concentration of 0.4-0.6ppm after 8.5-11 hours in total in the third stage of pickling, adding pH regulator with concentration of 4-5.5Pppm to the water collecting tank in an impact way after circulating for 1-2 hours, when the pH value is reduced to 4-5, adding compound acid to control the pH value of the water collecting tank to 3-4 for chemical cleaning, measuring the pH value once every 0.5-1 hour during the period, controlling the pH value of the water collecting tank to 3-4 according to the pH value and the total hardness change, and hanging the water collecting tank into a cleaning hanging piece during the period.
2. A method of cleaning a bundle of cooling apparatus according to claim 1, wherein:
and in the second step, stripping agent and defoaming agent are added every half an hour according to the foam and turbidity conditions of the water collecting tank, specifically, the defoaming agent is added after the water collecting tank cleaning water is foamed, and the stripping agent with the concentration of 100-130mg/L is added when the turbidity of the water collecting tank cleaning water is monitored to be 10-30 mg/L.
3. A method of cleaning a bundle of cooling apparatus according to claim 1, wherein: the three-stage acid washing of the second step adopts compound acid for washing, wherein the compound acid is mixed solution of sulfamic acid and sulfuric acid, and the adding concentration is 3-6mg/L and 0.5-1mg/L respectively.
4. A method of cleaning a bundle of cooling apparatus according to claim 1, wherein: after the cleaning is finished, adding a PH regulator into the water collecting tank to regulate the PH value of the water to 7-9.
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