CN110760389A - Chemical cleaning agent for filter element of pre-filter of condensate polishing system and application - Google Patents
Chemical cleaning agent for filter element of pre-filter of condensate polishing system and application Download PDFInfo
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- CN110760389A CN110760389A CN201911000248.7A CN201911000248A CN110760389A CN 110760389 A CN110760389 A CN 110760389A CN 201911000248 A CN201911000248 A CN 201911000248A CN 110760389 A CN110760389 A CN 110760389A
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- 238000011045 prefiltration Methods 0.000 title claims abstract description 55
- 239000012459 cleaning agent Substances 0.000 title claims abstract description 38
- 239000000126 substance Substances 0.000 title claims abstract description 28
- 238000005498 polishing Methods 0.000 title claims abstract description 14
- 238000004140 cleaning Methods 0.000 claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 238000005406 washing Methods 0.000 claims abstract description 17
- 230000002378 acidificating effect Effects 0.000 claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 15
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims abstract description 14
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 14
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims abstract description 14
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 9
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims abstract description 7
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 7
- 235000019253 formic acid Nutrition 0.000 claims abstract description 7
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 7
- 235000013024 sodium fluoride Nutrition 0.000 claims abstract description 7
- 239000011775 sodium fluoride Substances 0.000 claims abstract description 7
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims abstract description 6
- 150000003839 salts Chemical class 0.000 claims abstract description 5
- 239000003513 alkali Substances 0.000 claims abstract description 4
- 238000011010 flushing procedure Methods 0.000 claims description 24
- 239000012528 membrane Substances 0.000 claims description 24
- 238000002791 soaking Methods 0.000 claims description 20
- 239000002351 wastewater Substances 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 14
- 238000011001 backwashing Methods 0.000 claims description 13
- 239000003921 oil Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 239000003814 drug Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000013043 chemical agent Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 19
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 abstract description 7
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 abstract description 6
- 239000005751 Copper oxide Substances 0.000 abstract description 6
- 229910000431 copper oxide Inorganic materials 0.000 abstract description 6
- 235000013980 iron oxide Nutrition 0.000 description 9
- 239000000835 fiber Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013527 degreasing agent Substances 0.000 description 1
- 238000005237 degreasing agent Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000338 in vitro Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
- C11D1/22—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aromatic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/16—Cleaning-out devices, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/04—Water-soluble compounds
- C11D3/046—Salts
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2075—Carboxylic acids-salts thereof
- C11D3/2079—Monocarboxylic acids-salts thereof
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2075—Carboxylic acids-salts thereof
- C11D3/2086—Hydroxy carboxylic acids-salts thereof
-
- 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
- C11D3/39—Organic or inorganic per-compounds
- C11D3/3942—Inorganic per-compounds
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- General Chemical & Material Sciences (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a chemical cleaning agent for a filter element for a pre-filter of a condensate polishing system and application thereof, wherein the chemical cleaning agent for the filter element comprises an alkaline cleaning agent A and an acidic stripping agent B, the alkaline cleaning agent A and the acidic stripping agent B respectively comprise the following components, and the alkaline cleaning agent A comprises analytically pure sodium bicarbonate, hydrogen peroxide and sodium dodecyl benzene sulfonate; the acidic stripping agent B comprises analytically pure glycolic acid, formic acid and sodium fluoride; the application method comprises the steps of removing salt scale by acid washing, removing oil stain by alkali washing and washing with clear water. The invention is used for cleaning the pre-filter of the condensate polishing system, not only can remove iron oxide in the filter element, but also can remove silicate, copper oxide, oil stain and the like, thereby recovering the filter element channel of the pre-filter, reducing the operation pressure difference, prolonging the operation period and improving the water vapor quality.
Description
Technical Field
The invention relates to the technical field of chemical reagents, in particular to a chemical cleaning agent for cleaning a filter element of a filter.
Background
With the rapid development of high-parameter and high-capacity generator sets, controlling the water vapor quality of a thermodynamic system within a qualified range is an important measure for ensuring the safe and economic operation of the generator sets.
At present, a configuration mode of adding a high-speed mixed bed to remove salt is mostly adopted in a condensate polishing system of a power plant, and the main function of the prefilter of the condensate polishing system is to remove impurities such as iron oxide, silicate colloid and suspended matters generated in the circulating operation process of a thermodynamic system, so that the prefilter plays an important role in preventing the pollution of high-speed mixed bed ion exchange resin and improving the quality of water vapor. The commonly used pre-filter has multiple types such as a cover filter, a resin powder cover filter, a tubular microporous filter, an electromagnetic filter and the like, the filter core structure takes stainless steel as a framework, and the types such as fiber winding and the like as a filtering unit, has the characteristics of large pollutant interception capacity, small resistance, high strength, capability of backwashing and the like, and is widely applied to a condensate fine treatment system of a power plant. However, in the process of long-term operation of any type of filter element, the phenomenon that the pressure difference obviously rises during the initial operation can occur, the polluted filter element is analyzed by utilizing experimental means such as energy spectrum analysis, and the like, and the substances blocked in the fiber line pores on the surface of the filter element are mainly iron oxide and other pollutants, and the substances are not simply attached to the surface of the fiber line, but have a certain precipitation reaction and are deposited on the surface and the inside of the filter element, and the impurities are difficult to elute by physical cleaning measures such as air scrubbing, hydraulic backwashing and the like.
The chemical cleaning of the filter element of the filter is an off-line or on-line chemical cleaning mode implemented in the filter body or in vitro by using a compound chemical cleaning agent and special cleaning equipment. The chemical cleaning technology for the filter element has the characteristics of uniform and thorough cleaning, no damage to equipment and the like, and has the advantages of low cost, short time and the like, so that the research and the application of the chemical cleaning of the pre-filter of the fine treatment system are more and more. The chemical cleaning technology for the pre-filter of the fine treatment system in China mainly adopts the modes of alkali cleaning and citric acid cleaning to clean the filter element of the filter, and mainly removes iron oxides and simultaneously removes silicon and oil.
According to the analysis of the components of the scale sample on the surface of the filter element of the pre-filter of the condensate fine treatment system of a plurality of power plants, the scale sample mainly comprises silicon dioxide, iron oxide, copper oxide, ignition increment and decrement and the like, wherein the proportion of the components of silicate is maximum and reaches 36.6%, and the content of the iron oxide reaches 28.8%.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a filter element chemical cleaning agent which is applied to a power plant and used for cleaning a pre-filter of a condensate polishing system, not only can be used for removing iron oxide in the filter element, but also can be used for removing silicate, copper oxide, oil stain and the like, so that a filter element channel of the pre-filter is recovered, the operation pressure difference is reduced, the operation period is prolonged, and the water vapor quality is improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
The chemical cleaning agent for the filter element of the pre-filter of the condensate fine treatment system comprises an alkaline cleaning agent A and an acidic stripping agent B, wherein the alkaline cleaning agent A and the acidic stripping agent B respectively comprise the following components in percentage by weight, the alkaline cleaning agent A comprises 45.0-55.0% of analytically pure sodium bicarbonate, 35.0-45.0% of hydrogen peroxide and 10.0-20.0% of sodium dodecyl benzene sulfonate, and the raw materials are synthesized to be 100.0%; the acidic stripping agent B comprises 45.0-50.0% of analytically pure glycolic acid, 25.0-30.0% of formic acid and 20.0-25.0% of sodium fluoride, and the raw materials are 100.0% in total; the chemical agents are all analytically pure.
The chemical cleaning agent for the filter element of the pre-filter of the condensate polishing system comprises an alkaline cleaning agent A and an acidic stripping agent B, wherein the alkaline cleaning agent A and the acidic stripping agent B respectively comprise the following components in percentage by weight: 50.0-52.0% of analytically pure sodium bicarbonate, 38.0-42.0% of hydrogen peroxide and 12.0-18.0% of sodium dodecyl benzene sulfonate, wherein the raw materials are synthesized to be 100.0%; acid stripping agent B: 48.0-50.0% of analytically pure glycolic acid, 25.0-28.0% of formic acid and 20.0-22.0% of sodium fluoride; the raw materials are combined to be 100.0 percent.
The application of the chemical cleaning agent for the filter element is used for cleaning a pre-filter of a condensate polishing system, and specifically comprises the following steps:
A. water washing: a cleaning mechanism is built by adopting a pipeline, a membrane laying box, a membrane laying pump, a holding pump, a lower discharge valve, an air compressor, an exhaust valve, a backwashing pump and a pre-filter to be cleaned; circularly flushing the cleaning mechanism by adopting secondary demineralized water or pure water of more than two levels, and opening a lower discharge valve to discharge wastewater;
B. alkali washing: injecting water into a film paving box to a middle liquid level, slowly adding an alkaline cleaning agent A and an organic silicon oil remover, uniformly mixing, and measuring the concentration of an alkaline cleaning agent A aqueous solution to be between 4.0 and 5.0 percent; starting a membrane paving pump, opening a valve of an outlet of a holding pump, and pumping all the liquid medicine in a membrane paving box into a pre-filter to be cleaned; cleaning deep pollution inside the filtering element by soaking and compressed air impact to remove oil dirt; after the alkaline cleaning is finished, opening a lower discharge valve to discharge the wastewater; then closing the lower discharge valve, opening a backwashing pump, and carrying out reverse clear water flushing until the pH value of the discharged wastewater is neutral;
C. acid washing: injecting water into a film paving box to a middle liquid level, slowly adding an acid stripping agent B, uniformly mixing, and measuring the concentration of the acid stripping agent B aqueous solution to be between 3.5 and 4.5 percent; starting a membrane paving pump, opening a valve of an outlet of a holding pump, and pumping all the liquid medicine in a membrane paving box into a pre-filter to be cleaned; cleaning deep pollution inside the filtering element by soaking and compressed air impact to remove salt scale; after the acid cleaning is finished, opening a lower discharge valve to discharge the wastewater; then closing the lower discharge valve, opening a backwashing pump, and carrying out reverse clear water flushing until the pH value of the discharged wastewater is neutral; closing the lower discharge valve, stopping the backwashing pump, and filling water into the pre-filter for about 2/3;
D. water washing: and (3) flushing the cleaning system by using pure water of a grade higher than the secondary desalted water until the effluent is clear, the pH value is 7 +/-0.2, and the difference between the conductivity of the effluent and the conductivity of the desalted water is +/-0.2, so that the cleaning of the prefilter is completed.
The application of the filter element chemical cleaning agent, the soaking impact cleaning process in the step B and the step C is carried out in three stages, and the method specifically comprises the following steps: soaking for 2-5h at the first stage, and opening an air compressor for 2s every 10 min; second stage, soaking for 2-5h, and opening an air compressor for 2s every 30 min; thirdly, soaking for 4-10 h.
In the application of the filter element chemical cleaning agent, the cleaning system in the step A comprises a forward cleaning branch and a backward flushing branch, the forward cleaning branch comprises a membrane laying box, a membrane laying pump, a pre-filter to be cleaned and a lower discharge valve which are connected in series through a pipeline, and the maintaining pump is connected in parallel with the water inlet end and the water outlet end of the pre-filter to be cleaned; the back flushing branch comprises a back flushing pipeline which is connected with the water outlet end of the pre-filter to be cleaned and the clean water tank, and a back flushing pump is arranged on the back flushing pipeline; and the forward cleaning branch is also communicated with an air compressor through a gas pipeline.
Due to the adoption of the technical scheme, the technical progress of the invention is as follows.
The sodium bicarbonate and the hydrogen peroxide in the alkaline cleaning agent A can effectively remove oil contamination impurities in the filter element, and the high-efficiency activator sodium dodecyl benzene sulfonate can fully emulsify and activate oil contamination particles; the glycolic acid and formic acid in the acidic stripping agent B have the main functions of removing iron scale and rust, and the sodium fluoride can remove a large amount of silica scale in the polypropylene fiber filter element of the filter, so that the cleaning effect is improved.
The invention can be matched with special cleaning equipment to carry out off-line or on-line chemical cleaning in or out of the pre-filter body, not only can remove silicate, iron oxide and copper oxide, but also can remove impurities such as oil stain and the like, thereby recovering the filter element channel of the pre-filter, and achieving the purposes of reducing the operation pressure difference, prolonging the operation period and improving the water vapor quality. In addition, the pre-filter is cleaned by adopting the invention, the filter element does not need to be disassembled and assembled, the cleaning temperature is low, and the influence on the fiber strength and the service life of the filter element is avoided; in addition, the cleaning agent has good solubility and is easy to flush, the flushing time is short when the system is put into operation, the cleaning of the pre-filter of 1 unit can be completed within 5-7 days, the water consumption is low, the effluent quality is not influenced, and the system is put into operation quickly.
Drawings
FIG. 1 is a schematic structural view of a cleaning mechanism according to the present invention.
Detailed Description
The invention will be described in further detail below with reference to the figures and specific examples.
The utility model provides a condensate polishing system prefilter is with straining first chemical cleaner of component, includes alkaline cleaner A and acid stripping agent B, and alkaline cleaner A is used for cleaing away the greasy dirt of straining the component, includes the following weight ratio's component: 45.0-55.0% of analytically pure sodium bicarbonate, 35.0-45.0% of hydrogen peroxide, 10.0-20.0% of sodium dodecyl benzene sulfonate and 100.0% of the raw materials in total; the acidic stripping agent B is used for removing silicate, iron oxide and copper oxide in the filter element and stripping the silicate, iron oxide and copper oxide from the surface of the filter element, and comprises the following components in percentage by weight: 45.0-50.0% of analytically pure glycolic acid, 25.0-30.0% of formic acid and 20.0-25.0% of sodium fluoride, and the raw materials are combined to be 100.0%. The chemical agents used in the alkaline cleaner A and the acidic remover B are analytically pure.
The chemical cleaning agent for the filter element is applied to a thermal power plant and used for cleaning a pre-filter of a condensate polishing system, and specifically comprises the following steps.
A. Water washing: a cleaning mechanism is built by adopting a pipeline, a membrane laying box, a membrane laying pump, a holding pump, a lower discharge valve, an air compressor, an exhaust valve, a backwashing pump and a pre-filter to be cleaned; circularly cleaning the cleaning mechanism by adopting secondary demineralized water or pure water of more than two levels; and opening the lower discharge valve to discharge the wastewater.
The cleaning mechanism in this step is used for connecting at the both ends of the pre-filter to be cleaned, and is used for cleaning the pre-filter filtering element, and the structure of the cleaning mechanism is shown in fig. 1, and specifically comprises the following steps: the cleaning mechanism comprises a forward cleaning branch and a backward washing branch, the forward cleaning branch comprises a membrane laying box, a membrane laying pump, a pre-filter to be cleaned and a lower discharge valve which are connected in series through a pipeline, and the holding pump is connected in parallel with the water inlet end and the water outlet end of the pre-filter to be cleaned; the reverse flushing branch comprises a reverse flushing pipeline which is connected with the water outlet end of the pre-filter to be cleaned and a clean water tank, and a back flushing pump is arranged on the reverse flushing pipeline; and the forward cleaning branch is also communicated with an air compressor through a gas pipeline. In order to prevent excessive pressure in the cleaning mechanism and the pre-filter to be cleaned, an exhaust valve may be installed on the pre-filter.
Wherein the film laying box is used as a liquid medicine configuration box, and the film laying pump is used as a liquid medicine delivery pump.
B. Alkali washing: injecting water into a film paving box to a middle liquid level, slowly adding 50kg of alkaline cleaning agent A and 6-8kg of organic silicon degreasing agent, and uniformly mixing to ensure that the concentration of the aqueous solution of the alkaline cleaning agent A is 4.0-5.0%; and starting the membrane paving pump, opening a valve of the outlet of the holding pump, and pumping all the liquid medicine in the membrane paving tank into the pre-filter to be cleaned.
Cleaning deep pollution inside the filtering element by soaking and compressed air impact to remove salt scale; and after the alkaline cleaning is finished, opening a lower discharge valve to discharge the wastewater. In the step, the soaking impact cleaning process is carried out in three stages, specifically: soaking for 2-5h at the first stage, and opening an air compressor for 2s every 10 min; second stage, soaking for 2-5h, and opening an air compressor for 2s every 30 min; thirdly, soaking for 4-10 h. The specific soaking time and the opening time of the air compressor are adjusted according to the model of the pre-filter to be cleaned.
Then closing the lower discharge valve, opening a backwashing pump, and carrying out reverse clear water flushing until the pH value of the discharged wastewater is neutral; the drain valve was closed, the backwash pump was stopped, and the pre-filter was filled with water at about 2/3.
C. Acid washing: and injecting water into the film paving box to a middle liquid level, slowly adding 45kg of the acid stripping agent B, and uniformly mixing to ensure that the concentration of the water solution of the acid stripping agent B is between 3.5 and 4.5 percent. After the mixture is uniform, the membrane paving pump is started, the valve of the outlet of the holding pump is opened, and all the liquid medicine in the membrane paving tank is pumped into the pre-filter to be cleaned.
Cleaning deep pollution inside the filtering element by soaking and compressed air impact to remove oil dirt; after the acid cleaning is finished, opening a lower discharge valve to discharge the wastewater; and then closing the lower discharge valve, opening a backwashing pump, and performing reverse clear water flushing until the pH value of the discharged wastewater is neutral. The soaking impact cleaning process in the step is the same as the step B.
D. Water washing: and (3) washing the cleaning mechanism by using pure water of a grade higher than the secondary desalted water until the effluent is clear, the pH value is 7 +/-0.2, and the difference between the conductivity of the effluent and the conductivity of the desalted water is +/-0.2, so that the cleaning of the prefilter is completed.
In the above steps, during the process of discharging the waste water, the air compressor can be opened to charge air into the pre-filter, so as to accelerate the discharge of the waste water.
Claims (5)
1. The chemical cleaning agent for the filter element of the pre-filter of the condensate polishing system is characterized by comprising an alkaline cleaning agent A and an acidic stripping agent B, wherein the alkaline cleaning agent A and the acidic stripping agent B respectively comprise the following components in percentage by weight,
alkaline cleaner A: 45.0-55.0% of analytically pure sodium bicarbonate, 35.0-45.0% of hydrogen peroxide and 10.0-20.0% of sodium dodecyl benzene sulfonate, wherein the raw materials are combined to be 100.0%;
acid stripping agent B: 45.0-50.0% of analytically pure glycolic acid, 25.0-30.0% of formic acid and 20.0-25.0% of sodium fluoride, wherein the raw materials are combined to be 100.0%;
the chemical agents are all analytically pure.
2. The chemical cleaning agent for the filter element of the pre-filter of the condensate polishing system as claimed in claim 1, wherein the alkaline cleaning agent A and the acidic stripping agent B respectively comprise the following components in the following weight ratio,
alkaline cleaner A: 50.0-52.0% of analytically pure sodium bicarbonate, 38.0-42.0% of hydrogen peroxide, 12.0-18.0% of sodium dodecyl benzene sulfonate and 100.0% of the raw materials in total;
acid stripping agent B: 48.0-50.0% of analytically pure glycolic acid, 25.0-28.0% of formic acid and 20.0-22.0% of sodium fluoride, and the raw materials are combined to be 100.0%.
3. The application of the filter element chemical cleaning agent as claimed in claim 1, wherein the filter element chemical cleaning agent is used for cleaning a pre-filter of a condensate polishing system, and specifically comprises the following steps:
A. water washing: a cleaning mechanism is built by adopting a pipeline, a membrane laying box, a membrane laying pump, a holding pump, a lower discharge valve, an air compressor, an exhaust valve, a backwashing pump and a pre-filter to be cleaned; circularly cleaning the cleaning mechanism by adopting secondary demineralized water and pure water of above grade; opening a lower discharge valve to discharge wastewater;
B. alkali washing: injecting water into a film paving box to a middle liquid level, slowly adding 50kg of alkaline cleaning agent A and 6-8kg of organic silicon oil remover, and uniformly mixing to ensure that the concentration of the aqueous solution of the alkaline cleaning agent A is 4.0-5.0%; starting a membrane paving pump, opening a valve of an outlet of a holding pump, and pumping all the liquid medicine in a membrane paving box into a pre-filter to be cleaned; cleaning deep pollution inside the filtering element by soaking and compressed air impact to remove salt scale; after the alkaline cleaning is finished, opening a lower discharge valve to discharge the wastewater; then closing the lower discharge valve, opening a backwashing pump, and carrying out reverse clear water flushing until the pH value of the discharged wastewater is neutral; closing the lower discharge valve, stopping the backwashing pump, and filling water into the pre-filter for about 2/3;
C. acid washing: injecting water into the film paving box to a middle liquid level, slowly adding 45kg of the acidic stripping agent B, and uniformly mixing to ensure that the concentration of the aqueous solution of the acidic stripping agent B is between 3.5 and 4.5 percent; after the mixture is uniformly mixed, starting a membrane paving pump, opening a valve of an outlet of a holding pump, and pumping all the liquid medicine in a membrane paving tank into a pre-filter to be cleaned; cleaning deep pollution inside the filtering element by soaking and compressed air impact to remove oil dirt; after the acid cleaning is finished, opening a lower discharge valve to discharge the wastewater; then closing the lower discharge valve, opening a backwashing pump, and carrying out reverse clear water flushing until the pH value of the discharged wastewater is neutral;
D. water washing: and (3) flushing the cleaning mechanism by using demineralized water until the effluent is clear, the pH value is 7 +/-0.2, and the difference between the conductivity of the effluent and the conductivity of the demineralized water is +/-0.2, so that the cleaning of the prefilter is completed.
4. The application of the chemical cleaning agent for filter elements according to claim 3, wherein the soaking impact cleaning process in the step B and the step C is carried out in three stages, specifically: soaking for 2-5h at the first stage, and opening an air compressor for 2s every 10 min; second stage, soaking for 2-5h, and opening an air compressor for 2s every 30 min; thirdly, soaking for 4-10 h.
5. The application of the filter element chemical cleaning agent as claimed in claim 3, wherein the cleaning mechanism in the step A comprises a forward cleaning branch and a reverse flushing branch, the forward cleaning branch comprises a membrane laying box, a membrane laying pump, a pre-filter to be cleaned and a lower discharge valve which are connected together in series through a pipeline, and the holding pump is connected in parallel with the water inlet end and the water outlet end of the pre-filter to be cleaned; the back flushing branch comprises a back flushing pipeline which is connected with the water outlet end of the pre-filter to be cleaned and the clean water tank, and a back flushing pump is arranged on the back flushing pipeline; and the forward cleaning branch is also communicated with an air compressor through a gas pipeline.
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| CN201911000248.7A CN110760389A (en) | 2019-10-21 | 2019-10-21 | Chemical cleaning agent for filter element of pre-filter of condensate polishing system and application |
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