CN114632424A - Acid-base comprehensive compensation system and method for chemical cleaning of reverse osmosis membrane - Google Patents
Acid-base comprehensive compensation system and method for chemical cleaning of reverse osmosis membrane Download PDFInfo
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- CN114632424A CN114632424A CN202210461667.6A CN202210461667A CN114632424A CN 114632424 A CN114632424 A CN 114632424A CN 202210461667 A CN202210461667 A CN 202210461667A CN 114632424 A CN114632424 A CN 114632424A
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- 238000004140 cleaning Methods 0.000 title claims abstract description 108
- 239000000126 substance Substances 0.000 title claims abstract description 104
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000012528 membrane Substances 0.000 title claims abstract description 27
- 239000002253 acid Substances 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000003513 alkali Substances 0.000 claims abstract description 34
- 239000002585 base Substances 0.000 claims abstract description 26
- 238000005406 washing Methods 0.000 claims abstract description 21
- 239000003814 drug Substances 0.000 claims description 30
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 12
- -1 hydrogen ions Chemical class 0.000 claims description 9
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 238000010979 pH adjustment Methods 0.000 claims description 8
- 210000001061 forehead Anatomy 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 238000010926 purge Methods 0.000 claims 1
- 238000010612 desalination reaction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 239000013535 sea water Substances 0.000 abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000000243 solution Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- HLLSOEKIMZEGFV-UHFFFAOYSA-N 4-(dibutylsulfamoyl)benzoic acid Chemical compound CCCCN(CCCC)S(=O)(=O)C1=CC=C(C(O)=O)C=C1 HLLSOEKIMZEGFV-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 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
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 231100001240 inorganic pollutant Toxicity 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/162—Use of acids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/164—Use of bases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses an acid-base comprehensive compensation system and method for reverse osmosis membrane chemical cleaning, wherein during acid cleaning, the volume of acid added into a chemical cleaning water tank is obtained according to a set pH value, and the dosage of a metering pump is obtained according to the volume of the acid added into the chemical cleaning water tank; during alkaline washing, calculating the volume of alkali added into the chemical cleaning water tank according to the set pH value, and then obtaining the dosage of the metering pump according to the volume of the alkali added into the chemical cleaning water tank; and calculating the dosing frequency of the metering pump according to the calculated dosing amount of the metering pump, so as to realize the adjustment of the dosing frequency of the metering pump. The method can perform real-time tracking compensation on the pH value in the process of cleaning the seawater desalination membrane by adopting the reverse osmosis process, accurately control the pH value required in the chemical cleaning process, reduce the operation of manual dosage in the reverse osmosis chemical cleaning process and further improve the effect of the reverse osmosis chemical cleaning.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to an acid-base comprehensive compensation system and method for reverse osmosis membrane chemical cleaning.
Background
In the normal operation process of a seawater desalination system, substances causing surface and internal pollution of the reverse osmosis membrane in various forms, such as various alternation of hydrated metal oxides, calcium-containing sediments, organic matters, organisms and the like, suspended matters and the like, cause the performance of the reverse osmosis membrane to be reduced, and the performance is shown in that the operation pressure, the differential pressure are increased, the desalination rate is changed and the like, and corresponding chemical agents are often needed to be used for carrying out chemical cleaning on the membrane system, changing the composition or the attribute of pollutants and recovering the performance of the membrane element.
Aiming at specific slow pollution, a corresponding cleaning method is needed to have a good cleaning effect, if a chemical cleaning medicine combination method is selected mistakenly, the pollution of a reverse osmosis system is possibly aggravated, for example, an acid cleaning agent can be used for clearing inorganic pollutants including iron pollution, and an alkaline cleaning agent is used for cleaning organic pollutants including microorganisms, but acid and alkaline agents are required to be manually conveyed and added to prepare cleaning liquid in the acid and alkaline cleaning process of the reverse osmosis system at present, acid and alkaline agents are required to be manually conveyed and added to maintain the pH value along with the consumption of acid and alkali in the cleaning process, the pH value is required to be manually supplemented with acid and alkali to maintain the pH value, the working environment is poor, the strength is high, and the acid and alkali corrosion risk is also existed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an acid-base comprehensive compensation system and method for reverse osmosis membrane chemical cleaning.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides an acid-base comprehensive compensation system for reverse osmosis membrane chemical cleaning, includes reverse osmosis system, chemical cleaning system, medicine system and steam heating system, and wherein, reverse osmosis system links to each other with chemical cleaning system, forms circulated return circuit, and medicine system and steam heating system link to each other with chemical cleaning system.
The invention is further improved in that a pH online detection instrument is arranged in the chemical cleaning system.
The invention is further improved in that a temperature online detection instrument is arranged in the chemical cleaning system.
The invention is further improved in that the chemical cleaning system comprises a reverse osmosis chemical cleaning water tank, and the dosing system comprises a hydrochloric acid metering pump and an alkali metering pump.
An acid-base comprehensive compensation method for chemical cleaning of a reverse osmosis membrane comprises the following steps:
during acid washing, the hydrogen ion concentration is obtained according to the set pH value; obtaining the volume of acid added into the chemical cleaning water tank according to the hydrogen ion concentration, the initial hydrogen ion concentration in the chemical cleaning water tank, the water volume in the chemical cleaning water tank and the hydrogen ion concentration of the added acid, and obtaining the dosage of the metering pump according to the volume of the added acid in the chemical cleaning water tank;
during alkaline cleaning, calculating the concentration of hydroxyl according to the set pH, calculating the volume of alkali added into the chemical cleaning water tank according to the concentration of the hydroxyl, the initial concentration of hydrogen ions in the chemical cleaning water tank and the concentration of the hydroxyl ions added with the alkali, and then calculating the volume of the alkali added into the chemical cleaning water tank to obtain the dosage of the metering pump;
and calculating the frequency of the metering pump according to the calculated dosing amount of the metering pump, and realizing the adjustment of the dosing frequency of the metering pump during acid washing and alkali washing.
In a further development of the invention, the volume of acid added to the chemical cleaning tank is calculated by the following formula:
c(H+)＝[c(H+)1V1+c(H+)2V2]/(V1+V2)
in the formula, c (H)+)1-initial hydrogen ion concentration in the chemical cleaning water tank;
V1-volume of water in chemical cleaning tank;
c(H+)2-hydrogen ion concentration of the added acid;
V2volume of acid added in chemical wash tank.
The further improvement of the invention is that during acid cleaning, the dosage of the metering pump is calculated by the following formula: qMedicine＝V2/t；
Wherein t-the time taken to complete the pH adjustment is given;
Qmedicine-dosing of a dosing pump;
V2volume of acid added in chemical wash tank.
A further improvement of the invention is that the volume of alkali added to the chemical wash tank is calculated by the following formula:
c(OH-)＝[c(OH-)1V1+c(OH-)2V3]/(V1+V3)；
in the formula, c (OH)-)1-initial hydroxide ion concentration in the chemical cleaning tank;
V1-volume of water in chemical cleaning tank;
c(OH-)2-the hydroxide concentration of the added base;
V3-volume of base added in chemical cleaning tank.
The further improvement of the invention is that the dosage Q of the metering pump is obtained during alkaline washingMedicineCalculated by the following formula:
Qmedicine＝V3/t
Wherein t-the time taken to complete the pH adjustment is given;
V3-the volume of alkaline solution required.
The invention is further improved in that the dosing frequency of the metering pump is calculated by the following formula:
P＝Qmedicine*50/QForehead (forehead)/T
In the formula: p is the running frequency of the dosing pump;
Qmedicine-dosing of a dosing pump;
Qforehead (forehead)-rated dosing of the dosing pump;
t-metering pump stroke.
Compared with the prior art, the invention has the following beneficial effects:
the invention can perform real-time tracking compensation on the pH value in the seawater desalination membrane cleaning by adopting the reverse osmosis process, accurately control the pH value required by the chemical cleaning process, reduce the operation of manual dosage in the reverse osmosis chemical cleaning process and further improve the reverse osmosis chemical cleaning effect.
According to the invention, during acid washing and alkali washing, automatic pH adjustment and automatic pH compensation in the chemical cleaning process are realized according to the set pH value and the time required for completing the pH adjustment, and the chemical cleaning heating system can be interlocked by monitoring the pH value in the chemical cleaning process in real time, so that the high efficiency and the order of the cleaning process are ensured on the premise of reducing the manual dosage as much as possible, and the dangers of manual acid and alkali supplementation for maintaining the pH value, poor working environment, high strength and acid and alkali corrosion are overcome.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure, 1 is a reverse osmosis system, 2 is a chemical cleaning system, 3 is a dosing system, 4 is a steam heating system, 5 is a pH online detection instrument, and 6 is a temperature online detection instrument.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention provides an acid-base comprehensive compensation system for reverse osmosis membrane chemical cleaning, which comprises a reverse osmosis system 1, a chemical cleaning system 2, a dosing system 3, a steam heating system 4, a pH online detection instrument 5 and a temperature online detection instrument 6, wherein the reverse osmosis system 1 is connected with the chemical cleaning system 2 to form a circulatable loop, and the dosing system 3 and the steam heating system 4 are connected with the chemical cleaning system 2.
In a preferred real-time mode, a pH on-line measuring instrument and a temperature on-line measuring instrument are respectively disposed inside the chemical cleaning system 2. The chemical cleaning system 2 includes a reverse osmosis chemical cleaning tank. The dosing system 3 comprises a metering pump, and the dosing pump comprises a hydrochloric acid metering pump and an alkali metering pump. When adding acid, a hydrochloric acid metering pump is adopted, and when adding alkali, an alkali metering pump is adopted.
And determining the pH value to be adjusted in the chemical clear liquid, and calculating the concentration of the required hydrogen ions or hydroxyl ions according to the pH value to be adjusted.
Referring to fig. 1, according to the type of chemical cleaning to be performed, an acid and alkali dosing system 3 is used for realizing the automatic dispensing process of acid liquor and alkali liquor in a chemical cleaning system 2, a steam heating system 4 is used for heating chemical cleaning liquid, and the chemical cleaning liquid flows into a reverse osmosis system 1 from the chemical cleaning system 2 and then flows back to the chemical cleaning system 2 from the reverse osmosis system 1 for circulation.
An acid-base comprehensive compensation method for chemical cleaning of a reverse osmosis membrane comprises the following steps:
1. under the condition of acid washing, Kw ═ c (H) can be determined according to the set pH+)c(OH-) To give c (OH)-)；
c(OH-)＝[c(OH-)1V1+c(OH-)2V2]/(V1+V2)；
In the formula, c (OH)-)1-initial hydroxide ion concentration, mol/L, in the chemical cleaning tank;
V1-volume of water in chemical cleaning tank, L;
c(OH-)2-hydrogen ion concentration of the added base, mol/L;
V2volume of base added in chemical wash tank, L.
Calculating the volume V of the alkali solution required2Then by V2＝QMedicineT, obtaining the dosage Q of the metering pumpMedicine；
V2＝QMedicine*t
Where t-the time taken to complete the pH adjustment, h.
QMedicineDosage of metering pump, L/h
2. Under alkaline washing conditions, Kw ═ c (H) can be determined according to the pH+)c(OH-) To give c (OH)-)；
c(OH-)＝[c(OH-)1V1+c(OH-)2V3]/(V1+V3)；
In the formula, c (OH)-)1-initial hydroxide ion concentration, mol/L, in the chemical cleaning tank;
V1-volume of water in chemical cleaning tank, L;
c(OH-)2-hydroxide concentration of the added base, mol/L;
V3volume of base added in chemical wash tank, L.
Calculating the volume V of the alkali solution required3Then by V3＝QMedicineT, obtaining the dosage Q of the metering pumpMedicine；
V3＝QMedicine*t
Where t-the time taken to complete the pH adjustment, h.
QMedicineDosage of metering pump, L/h
According to the calculated dosage Q of the metering pumpMedicineAnd obtaining the metering pump frequency P according to the following formula to realize automatic regulation of dosing frequency of the acid and alkali metering pump:
P＝Qmedicine*50/QForehead (forehead)/T
Wherein:
p is the running frequency of the dosing pump, Hz;
QmedicineThe dosage of a metering pump is L/h;
Qforehead (forehead)The rated dosage of the dosage pump is L/h;
t-metering pump stroke.
Example 1
If the reverse osmosis chemical cleaning water tank is 50 cubes, the automatic clean water inlet is 40 cubes, the online instrument of the chemical cleaning water tank displays that the pH is 7, the acid for pickling adopts a hydrochloric acid solution with the mass concentration of 30%, the manual setting of the pH adjusting time is 0.1h, and the pickling requirement pH is 2, then the reverse osmosis chemical cleaning water tank is calculated according to a formula:
10-2＝(10-7*40*1000+9.5*V2)/(40*1000+V2)
the amount V of the hydrochloric acid with the required addition mass concentration of 30 percent can be obtained242.15L, according to the given 0.1h regulating time, the medicine adding flow is QMedicineIs 421.5L/h.
If the rated flow of the hydrochloric acid metering pump is 2022L/h and the stroke is 80%, automatically adjusting the frequency of the hydrochloric acid metering pump as follows:
P＝421.5*50/2022/0.8＝13hz
after the pH value is adjusted to 2, a temperature online detector controls a steam heating system to control the water temperature of the cleaning solution within 50 ℃ according to the requirements of membrane element manufacturers.
If the pH value is increased from 2 to 3 in the acid washing process, the deviation value of a manual given system is 1, the given pH adjusting time is 0.05h, and the volume of 42.15L hydrochloric acid added in the early-stage dosage is ignored, the pH value is calculated according to a formula:
10-2＝(10-3*40*1000+9.5*V2)/(40*1000+V2)
the required amount V of the hydrochloric acid added by 30 percent can be obtained237.93L, the dosing flow is Q according to the given 0.05h adjusting timeMedicineIs 758.6.9L/h.
At the moment, the acid metering pump is automatically started, and the operation frequency is automatically adjusted as follows:
P＝758.6*50/2022/0.8＝23hz
if the acid washing is finished, the water is washed by clear water until the pH value is 7 neutral, the water is fed for 40 times again, the pH adjusting time is manually set to be 0.1h, and the alkali washing requires the pH value to be 12, the calculation is carried out according to a formula:
10-2＝(10-7*40*1000+9.45*V2)/(40*1000+V2)
the required amount V of 30 percent sodium hydroxide can be obtained242.46L, the dosing flow is Q according to the given 0.1h adjusting timeMedicineIs 424.6L/h.
If the rated flow of the selected alkali metering pump is 663L/h and the stroke is 80%, the frequency of the alkali metering pump is automatically adjusted to be as follows:
P＝424.6*50/663/0.8＝40hz
after the pH value is adjusted to 12, the temperature of the cleaning solution is controlled within 30 ℃ by controlling a steam heating device by a temperature online detector according to the requirements of membrane element manufacturers.
If the pH value is reduced from 12 to 11 in the alkali washing process, the deviation value of the system is manually given to be 1, the pH adjusting time is given to be 0.01h, and the volume of 42.46L of sodium hydroxide added in the early-stage dosage is ignored, the alkaline washing process is calculated according to a formula:
10-2＝(10-3*40*1000+9.45*V2)/(40*1000+V2)
the required amount V of 30 percent sodium hydroxide can be obtained238.14L, the dosing flow is Q according to the given 0.01h adjusting timeMedicineIs 381.4L/h.
At the moment, the alkali metering pump is automatically started, and the operation frequency is automatically adjusted as follows:
P＝381.4*50/663/0.8＝36hz。
Claims (10)
1. the utility model provides an acid-base comprehensive compensation system for reverse osmosis membrane chemical cleaning, its characterized in that, includes reverse osmosis system (1), chemical cleaning system (2), medicine system (3) and steam heating system (4), and wherein, reverse osmosis system (1) links to each other with chemical cleaning system (2), forms circulated return circuit, and medicine system (3) and steam heating system (4) link to each other with chemical cleaning system (2).
2. The acid-base comprehensive compensation system for reverse osmosis membrane chemical cleaning according to claim 1, characterized in that a pH online detection instrument (5) is arranged in the chemical cleaning system (2).
3. The acid-base comprehensive compensation system for reverse osmosis membrane chemical cleaning according to claim 1, wherein a temperature online detection instrument (6) is arranged inside the chemical cleaning system (2).
4. The acid-base comprehensive compensation system for reverse osmosis membrane chemical cleaning according to claim 1, wherein the chemical cleaning system (2) comprises a reverse osmosis chemical cleaning water tank, and the dosing system (3) comprises a hydrochloric acid metering pump and an alkali metering pump.
5. An acid-base comprehensive compensation method for chemical cleaning of a reverse osmosis membrane is characterized by comprising the following steps:
during acid washing, obtaining the concentration of hydrogen ions according to the set pH value; obtaining the volume of acid added into the chemical cleaning water tank according to the hydrogen ion concentration, the initial hydrogen ion concentration in the chemical cleaning water tank, the water volume in the chemical cleaning water tank and the hydrogen ion concentration of the added acid, and obtaining the dosage of the metering pump according to the volume of the added acid in the chemical cleaning water tank;
during alkaline washing, calculating the concentration of hydroxide radical according to the set pH value, calculating the volume of alkali added into the chemical washing water tank according to the concentration of the hydroxide radical, the initial concentration of hydrogen ions in the chemical washing water tank and the concentration of the hydroxide radical ions added with the alkali, and obtaining the dosage of the metering pump according to the volume of the alkali added into the chemical washing water tank;
and calculating the frequency of the metering pump according to the calculated dosing amount of the metering pump, and realizing the adjustment of the dosing frequency of the metering pump during acid washing and alkali washing.
6. The acid-base combination compensation method for reverse osmosis membrane chemical cleaning according to claim 1, wherein the volume of acid added in the chemical cleaning water tank is calculated by the following formula:
c(H+)＝[c(H+)1V1+c(H+)2V2]/(V1+V2)
in the formula, c (H)+)1-initial hydrogen ion concentration in the chemical cleaning water tank;
V1-volume of water in chemical cleaning tank;
c(H+)2-hydrogen ion concentration of the added acid;
V2volume of acid added in chemical wash tank.
7. The acid-base comprehensive compensation method for chemical cleaning of the reverse osmosis membrane according to claim 1, wherein the dosage of a metering pump during acid cleaning is calculated by the following formula: qMedicine＝V2/t；
Wherein t-the time taken to complete the pH adjustment is given;
Qmedicine-dosing of a dosing pump;
V2volume of acid added in chemical purge tank.
8. The acid-base combination compensation method for chemical cleaning of reverse osmosis membrane according to claim 1, wherein the volume of the alkali added in the chemical cleaning water tank is calculated by the following formula:
c(OH-)＝[c(OH-)1V1+c(OH-)2V3]/(V1+V3)；
in the formula, c (OH)-)1-initial hydroxide ion concentration in the chemical cleaning tank;
V1-volume of water in chemical cleaning tank;
c(OH-)2-the hydroxide concentration of the added base;
V3-volume of base added in chemical cleaning tank.
9. The acid-base comprehensive compensation method for chemical cleaning of reverse osmosis membrane according to claim 1, wherein the dosage Q of a metering pump is obtained during alkaline cleaningMedicineCalculated by the following formula:
Qmedicine＝V3/t
Wherein t-the time taken to complete the pH adjustment is given;
V3-the volume of alkali solution required.
10. The acid-base comprehensive compensation method for chemical cleaning of the reverse osmosis membrane according to claim 1, wherein the dosing frequency of the metering pump is calculated by the following formula:
P＝Qmedicine*50/QForehead (forehead)/T
In the formula: p is the running frequency of the dosing pump;
Qmedicine-meteringAdding the medicine amount by a pump;
Qforehead (forehead)-rated dosing of the dosing pump;
t-metering pump stroke.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115161629A (en) * | 2022-08-01 | 2022-10-11 | 西安热工研究院有限公司 | Automatic dosing system and method for chemical cleaning and passivation process of power station boiler |
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| CN115161629B (en) * | 2022-08-01 | 2024-04-02 | 西安热工研究院有限公司 | Automatic dosing system and method for chemical cleaning and passivating process of power station boiler |
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