CN114409125A - Reverse osmosis intelligent dosing control system and dosing process - Google Patents
Reverse osmosis intelligent dosing control system and dosing process Download PDFInfo
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- CN114409125A CN114409125A CN202111592101.9A CN202111592101A CN114409125A CN 114409125 A CN114409125 A CN 114409125A CN 202111592101 A CN202111592101 A CN 202111592101A CN 114409125 A CN114409125 A CN 114409125A
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- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 186
- 239000012528 membrane Substances 0.000 claims abstract description 42
- 238000012544 monitoring process Methods 0.000 claims abstract description 41
- 239000003814 drug Substances 0.000 claims abstract description 17
- 230000000844 anti-bacterial effect Effects 0.000 claims description 31
- 239000003899 bactericide agent Substances 0.000 claims description 31
- 239000002455 scale inhibitor Substances 0.000 claims description 31
- 229910001424 calcium ion Inorganic materials 0.000 claims description 14
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 13
- 239000012141 concentrate Substances 0.000 claims description 12
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 239000011575 calcium Substances 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000004140 cleaning Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000011156 evaluation Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Inorganic materials [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
-
- 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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/001—Upstream control, i.e. monitoring for predictive control
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
- C02F2209/008—Processes using a programmable logic controller [PLC] comprising telecommunication features, e.g. modems or antennas
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
- C02F2209/055—Hardness
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/07—Alkalinity
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
Abstract
A reverse osmosis intelligent dosing control system, comprising: the water in the water tank flows out of the reverse osmosis membrane assembly through the filter to reach a preset area; a high-pressure pump is also arranged between the filter and the reverse osmosis membrane component; the control system further comprises a monitoring module, a control module and a dosing module. According to the reverse osmosis intelligent dosing control system and the dosing process, the working conditions such as hardness, pH and flow of inlet water can be monitored in real time by adopting the online monitoring instrument. The scaling tendency of the concentrated water LSI is fed back in real time, the reverse osmosis scaling risk can be early warned in time, and the digitization of the running state of the equipment and the health evaluation are realized; the control system can also automatically adjust the optimal medicament dosage, avoid insufficient or excessive medicament addition, prolong the cleaning period and the service life of the reverse osmosis membrane, avoid medicament waste and have intelligence and environmental protection.
Description
Technical Field
The invention belongs to the technical field of water treatment systems, and particularly relates to a reverse osmosis intelligent dosing control system and a dosing process.
Background
The water treatment aims to improve the water quality and make the water quality reach a certain water quality standard. There are various methods such as physical water treatment, chemical water treatment, biological water treatment, etc. depending on the treatment method.
The water treatment system generally adopts a membrane method combined separation system mainly based on reverse osmosis, in order to prevent the reverse osmosis membrane from being polluted by microorganisms and CaCO3、BaSO4The deposition of the compounds causes the membrane scaling, and the system is usually matched with corresponding medicine adding systems such as bactericides, scale inhibitors and the like; when a water treatment system treats a water source by surface water, well water, reclaimed water (reclaimed water) and the like, the components of the water quality are complex and unstable, and the chemical adding mode in the prior art usually adopts constant chemical adding amount, so that the reverse osmosis membrane is polluted and scaled due to insufficient chemical adding amount, or serious waste phenomenon exists due to long-term operation of excessive chemical adding amount, the operation cost of the water treatment system is increased, the environment is polluted and the like, and further, the enterprise income and social benefits are reduced.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a reverse osmosis intelligent dosing control system and a dosing process, which can automatically adjust the dosing dosage of a dosing system according to parameters such as hardness value, pH value, flow rate, concentration multiple and the like of water quality so as to solve the technical problem of insufficient or excessive dosing dosage.
The invention adopts the following technical scheme:
a reverse osmosis intelligent dosing control system, comprising: the water in the water tank flows out of the reverse osmosis membrane assembly through the filter to reach a preset area; a high-pressure pump for pumping water in the filter into the reverse osmosis membrane module is also arranged between the filter and the reverse osmosis membrane module; the control system also comprises a monitoring module, a control module and a dosing module; the monitoring module is arranged on the water tank and the reverse osmosis membrane module and is used for monitoring the state information of the water tank and the reverse osmosis membrane module; the control module is respectively connected with the monitoring module and the dosing module, and can control the dosing module to dose the medicine into the water flowing to the filter; the dosing module is arranged between the water tank and the filter.
As a further description of the above technical solution: the monitoring module comprises a hardness monitor, a raw water pH meter, a water inlet flow transmitter and a concentrated water flow transmitter.
As a further description of the above technical solution: the medicine adding module comprises a bactericide, a bactericide adding pump, a scale inhibitor and a scale inhibitor adding pump.
As a further description of the above technical solution: the control module comprises a PLC controller and a wired communication cable.
As a further description of the above technical solution: the hardness monitor and the raw water pH meter are connected to the water tank and used for monitoring the hardness and the pH value of water in the water tank.
As a further description of the above technical solution: the inflow flow transmitter is arranged between the water tank and the filter and used for monitoring the inflow between the water tank and the filter.
As a further description of the above technical solution: the concentrated water flow transmitter is arranged on a concentrated water pipe of the reverse osmosis membrane component and is used for monitoring the concentrated water flow discharged by the reverse osmosis membrane component.
As a further description of the above technical solution: and the PLC of the control module is connected to the current signal external control module of the bactericide dosing pump and the scale inhibitor dosing pump through a wired communication cable.
As a further description of the above technical solution: the monitoring module further comprises a TDS monitor, a total alkalinity monitor, a calcium ion monitor, a temperature transmitter and a concentrated water pH meter.
As a further description of the above technical solution: TDS monitor, total alkalinity monitor, calcium ion monitor, temperature transmitter and dense water pH meter all install on the dense water pipe of reverse osmosis membrane subassembly.
The reverse osmosis intelligent dosing process is realized by using the dosing control system.
As a further description of the above technical solution: the dosing process comprises the following steps:
step 1: injecting water into the water tank, monitoring the hardness and the pH value of the water by a hardness monitor and a raw water pH meter, and monitoring the inflow of the water after the water in the water tank flows out by an inflow transducer;
step 2: the control module calculates the adding amount of the bactericide and the scale inhibitor and controls the medicine adding module to add the bactericide and the scale inhibitor into water, and then the water flows into the filter for filtering;
and step 3: the filtered water is pumped into the reverse osmosis membrane module through the high-pressure pump, the water treated by the reverse osmosis membrane module flows to a preset area, the concentrated water flows out through the concentrated water pipe, and the concentrated water flow is monitored by the concentrated water flow transducer.
As a further description of the above technical solution: and in the step 2, the control module calculates the dosage of the scale inhibitor and the bactericide according to the water quality working condition.
As a further description of the above technical solution: the method for calculating the dosage of the scale inhibitor comprises the following steps:
Q3＝(a+b+c1+d)·Q1；
in the formula:
Q3-the dosed amount of scale inhibitor;
a-a coefficient related to the calcium hardness in water is converted by a calcium ion monitor value;
b-a coefficient related to the pH value of the water, and then converting the coefficient according to the pH value of the concentrated water;
c1-scale inhibitor dosing coefficient;
d-a coefficient related to the reverse osmosis concentration multiple, and converting the coefficient into a numerical value of the reverse osmosis concentration multiple n;
Q1-the inflow rate of water.
As a further description of the above technical solution: the method for calculating the dosage of the bactericide comprises the following steps:
Q4＝c2·Q1；
in the formula:
Q4-the dosage of the bactericide;
c2-the dosing coefficient of the bactericide;
Q1-the inflow rate of water.
As a further description of the above technical solution: the calculation method of the reverse osmosis concentration multiple is as follows:
in the formula:
n-concentration multiple of reverse osmosis;
Q1-a water inlet flow rate;
Q2-concentrate flow.
As a further description of the above technical solution: the concentrated water scaling tendency can be automatically judged through the Langerial index (LSI);
the LSI value calculation method is as follows:
LSI＝pH-pHs；
in the formula:
pH-the actual pH value of the concentrate at the operating temperature, measured by a concentrate pH meter;
pHs-CaCO3at saturation, the pH of the concentrate.
As a further description of the above technical solution: the pHs value is calculated as follows:
pHs＝(9.30+A+B)-(C+D)；
in the formula:
a-coefficient related to dissolved solids in water, and converting the coefficient into a value by a TDS monitor;
b-coefficient related to temperature of water, and then converted by the value of the temperature transmitter;
c-a coefficient related to the calcium hardness in water, and then converted by a calcium ion monitor value;
d-coefficient related to total alkalinity in water, and then converted by the value of the total alkalinity monitor.
As a further description of the above technical solution: wherein:
when LSI > 0, scaling;
when LSI is 0, neither corrosion nor scaling occurs;
when LSI < 0, corrosion occurs.
Compared with the prior art, the invention has the beneficial effects that:
according to the reverse osmosis intelligent dosing control system and the dosing process, the working conditions such as hardness, pH and flow of inlet water can be monitored in real time by adopting the online monitoring instrument. The scaling tendency of the concentrated water LSI is fed back in real time, the reverse osmosis scaling risk can be early warned in time, and the digitization of the running state of the equipment and the health evaluation are realized; the control system can also automatically adjust the optimal medicament dosage, avoid insufficient or excessive medicament addition, prolong the cleaning period and the service life of the reverse osmosis membrane, avoid medicament waste and have intelligence and environmental protection.
Drawings
FIG. 1 is a schematic diagram of a process principle of a reverse osmosis intelligent dosing control system of the present invention;
FIG. 2 is a control schematic diagram of the dosage of the bactericide of the present invention;
FIG. 3 is a schematic diagram of the scale inhibitor dosing control of the present invention;
in the figure:
1-a water tank;
2-hardness monitor;
3-raw water pH meter;
4-inflow flow transmitter;
5-a bactericide dosing pump;
6-scale inhibitor dosing pump;
7-a filter;
8-a high pressure pump;
9-a reverse osmosis membrane module;
10-TDS monitor;
11-total alkalinity monitor;
12-calcium ion monitor;
13-a temperature transmitter;
14-concentrated water pH meter;
15-concentrated water flow transmitter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described herein are only some embodiments of the invention, and not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive step based on the spirit of the present invention are within the scope of the present invention.
Fig. 1 is a schematic diagram of a process principle of the reverse osmosis intelligent dosing control system, and as shown in fig. 1, the reverse osmosis intelligent dosing control system mainly comprises a water tank 1, a filter 7 and a reverse osmosis membrane assembly 9.
The water in the water tank 1 flows out of the reverse osmosis membrane module 9 through the filter 7 to a predetermined area.
A high-pressure pump 8 for pumping the water in the filter 7 into the reverse osmosis membrane module 9 is also arranged between the filter 7 and the reverse osmosis membrane module 9. The high-pressure pump 8 adopts a variable frequency motor, and the rotating speed of the motor is adjusted in real time according to the inflow flow value, so that the purpose of stabilizing the running flow is achieved.
The control system also comprises a monitoring module, a control module and a dosing module.
The monitoring module is arranged on the water tank 1 and the reverse osmosis membrane assembly 9 and used for monitoring the state information of the water tank 1 and the reverse osmosis membrane assembly 9.
The control module is respectively connected with the monitoring module and the dosing module, and the control module can control the dosing module to add the chemicals into the water flowing to the filter 7.
The dosing module is arranged between the water tank 1 and the filter 7.
The monitoring module comprises a hardness monitor 2, a raw water pH meter 3, an inlet water flow transmitter 4 and a concentrated water flow transmitter 15.
The dosing module comprises a bactericide, a bactericide dosing pump 5, a scale inhibitor and a scale inhibitor dosing pump 6. The bactericide dosing pump 5 and the scale inhibitor dosing pump 6 both adopt variable-frequency metering pumps, and the dosing amount of the metering pumps can be controlled through remote signals.
The control module comprises a PLC controller and a wired communication cable.
The hardness monitor 2 and the raw water pH meter 3 are connected to the water tank 1 and used for monitoring the hardness and the pH value of water in the water tank 1; the water inlet flow transmitter 4 is arranged between the water tank 1 and the filter 7 and is used for monitoring the water inlet flow between the water tank 1 and the filter 7; the concentrated water flow transmitter 15 is provided on the concentrated water pipe of the reverse osmosis membrane module 9 for monitoring the concentrated water flow discharged from the reverse osmosis membrane module 9.
As shown in fig. 2 and 3, the PLC controller of the control module is connected to the current signal external control module of the bactericide dosing pump 5 and the scale inhibitor dosing pump 6 through wired communication cables. The current signal external control module can set the starting control stroke speed and the final control stroke speed corresponding to 4mA and 20mA, and realizes the function of automatically and proportionally controlling the dosing of the dosing pump by external current signals.
The monitoring module further comprises a TDS monitor 10, a total alkalinity monitor 11, a calcium ion monitor 12, a temperature transmitter 13 and a concentrated water pH meter 14. TDS monitor 10, total alkalinity monitor 11, calcium ion monitor 12, temperature transmitter 13 and dense water pH meter 14 all install on the dense water pipe of reverse osmosis membrane subassembly 9.
The TDS monitor 10 is used for monitoring dissolved solids in water; the total alkalinity monitor 11 is used for monitoring the total alkalinity in water; the calcium ion monitor 12 is used for monitoring calcium hardness in water; the temperature transmitter 13 is used for monitoring the temperature of the water; the concentrate pH meter 14 is used to monitor the pH of the concentrate.
An intelligent reverse osmosis dosing process is realized by using the dosing control system.
The dosing process comprises the following steps:
step 1: injecting water into the water tank 1, monitoring the hardness and the pH value of the water by the hardness monitor 2 and the raw water pH meter 3, and monitoring the inflow of the water after the water in the water tank 1 flows out through the inflow transducer 4;
step 2: the control module calculates the adding amount of the bactericide and the scale inhibitor and controls the medicine adding module to add the bactericide and the scale inhibitor into water, and then the water flows into the filter 7 for filtering;
and step 3: the filtered water is pumped into the reverse osmosis membrane module 9 by the high pressure pump 8, and the water treated by the reverse osmosis membrane module 9 is made to flow to a predetermined area, the concentrated water flows out through the concentrated water pipe, and the concentrated water flow is monitored by the concentrated water flow transmitter 15.
In the step 2, the control module calculates the dosage of the scale inhibitor and the bactericide according to the water quality working condition;
the method for calculating the dosage of the scale inhibitor comprises the following steps:
Q3＝(a+b+c1+d)·Q1；
in the formula:
Q3-the dosed amount of scale inhibitor;
a-the coefficient related to the calcium hardness in the water is converted by the value of the calcium ion monitor 12;
b-a coefficient related to the pH value in the water, and then converted by a 14 value of a concentrated water pH meter;
c1-scale inhibitor dosing coefficient;
d-a coefficient related to the reverse osmosis concentration multiple, and converting the coefficient into a numerical value of the reverse osmosis concentration multiple n;
Q1-the inflow rate of water.
The method for calculating the dosage of the bactericide comprises the following steps:
Q4＝c2·Q1；
in the formula:
Q4-the dosage of the bactericide;
c2-the dosing coefficient of the bactericide;
Q1-the inflow rate of water.
The calculation method of the reverse osmosis concentration multiple is as follows:
in the formula:
n-concentration multiple of reverse osmosis;
Q1-a water inlet flow rate;
Q2-concentrate flow.
The concentrated water scaling tendency can be automatically judged through the Langerial index (LSI);
the LSI value calculation method is as follows:
LSI＝pH-pHs；
in the formula:
pH-the actual pH of the concentrate at the operating temperature, as measured by the concentrate pH meter 14;
pHs-CaCO3the pH value of the concentrated water when saturated;
the pHs value is calculated as follows:
pHs＝(9.30+A+B)-(C+D)；
in the formula:
a-coefficient related to dissolved solids in water, and then converted by the value of a TDS monitor 10;
b-coefficient related to the temperature of the water, recalculated from the value of the temperature transmitter 13;
c-coefficient related to calcium hardness in water, and then converted by the value of the calcium ion monitor 12;
d-a coefficient related to the total alkalinity in water is converted by the numerical value of the total alkalinity monitor 11;
wherein:
when LSI > 0, scaling;
when LSI is 0, neither corrosion nor scaling occurs;
when LSI < 0, corrosion occurs.
Compared with the prior art, the invention has the beneficial effects that:
according to the reverse osmosis intelligent dosing control system and the dosing process, the working conditions such as hardness, pH and flow of inlet water can be monitored in real time by adopting the online monitoring instrument. The scaling tendency of the concentrated water LSI is fed back in real time, the reverse osmosis scaling risk can be early warned in time, and the digitization of the running state of the equipment and the health evaluation are realized; the control system can also automatically adjust the optimal medicament dosage, avoid insufficient or excessive medicament addition, prolong the cleaning period and the service life of the reverse osmosis membrane, avoid medicament waste and have intelligence and environmental protection.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (11)
1. A reverse osmosis intelligent dosing control system, comprising: water tank (1), filter (7) and reverse osmosis membrane subassembly (9), its characterized in that:
the water in the water tank (1) flows out of a reverse osmosis membrane assembly (9) through a filter (7) to reach a preset area;
a high-pressure pump (8) for pumping water in the filter (7) into the reverse osmosis membrane module (9) is also arranged between the filter (7) and the reverse osmosis membrane module (9);
the control system also comprises a monitoring module, a control module and a dosing module;
the monitoring module is arranged on the water tank (1) and the reverse osmosis membrane assembly (9) and is used for monitoring the state information of the water tank (1) and the reverse osmosis membrane assembly (9);
the control module is respectively connected with the monitoring module and the dosing module, and can control the dosing module to dose the medicine into the water flowing to the filter (7);
the dosing module is arranged between the water tank (1) and the filter (7).
2. The reverse osmosis intelligent dosing control system of claim 1, wherein:
the monitoring module comprises a hardness monitor (2), a raw water pH meter (3), an inflow transducer (4) and a concentrated water flow transducer (15).
3. The reverse osmosis intelligent dosing control system of claim 2, wherein:
the medicine adding module comprises a bactericide, a bactericide adding pump (5), a scale inhibitor and a scale inhibitor adding pump (6).
4. The reverse osmosis intelligent dosing control system of claim 3, wherein:
the control module comprises a PLC controller and a wired communication cable.
5. The reverse osmosis intelligent dosing control system of claim 2, wherein:
the hardness monitor (2) and the raw water pH meter (3) are connected to the water tank (1) and are used for monitoring the hardness and the pH value of water in the water tank (1);
the water inlet flow transmitter (4) is arranged between the water tank (1) and the filter (7) and is used for monitoring the water inlet flow between the water tank (1) and the filter (7);
the concentrated water flow transmitter (15) is arranged on a concentrated water pipe of the reverse osmosis membrane assembly (9) and is used for monitoring the concentrated water flow discharged by the reverse osmosis membrane assembly (9).
6. The reverse osmosis intelligent dosing control system of claim 4, wherein:
and the PLC of the control module is connected to the current signal external control module of the bactericide dosing pump (5) and the scale inhibitor dosing pump (6) through a wired communication cable.
7. The reverse osmosis intelligent dosing control system of claim 1, wherein:
the monitoring module also comprises a TDS monitor (10), a total alkalinity monitor (11), a calcium ion monitor (12), a temperature transmitter (13) and a concentrated water pH meter (14);
TDS monitor (10), total alkalinity monitor (11), calcium ion monitor (12), temperature transmitter (13) and dense water pH meter (14) all install on the dense water pipe of reverse osmosis membrane subassembly (9).
8. The reverse osmosis intelligent dosing process of claim 1, wherein:
the dosing process is achieved using the dosing control system of any one of claims 1 to 6;
the dosing process comprises the following steps:
step 1: injecting water into the water tank (1), monitoring the hardness and the pH value of the water by the hardness monitor (2) and the raw water pH meter (3), and monitoring the inflow of the water after the water in the water tank (1) flows out through the inflow transducer (4);
step 2: the control module calculates the adding amount of the bactericide and the scale inhibitor and controls the medicine adding module to add the bactericide and the scale inhibitor into water, and then the water flows into the filter (7) for filtering;
and step 3: the filtered water is pumped into the reverse osmosis membrane module (9) through a high-pressure pump (8), the water treated by the reverse osmosis membrane module (9) flows to a preset area, the concentrated water flows out through a concentrated water pipe, and the concentrated water flow is monitored by a concentrated water flow transmitter (15).
9. The reverse osmosis intelligent dosing process according to claim 8, characterized in that:
in the step 2, the control module calculates the dosage of the scale inhibitor and the bactericide according to the water quality working condition;
the method for calculating the dosage of the scale inhibitor comprises the following steps:
Q3＝(a+b+c1+d)·Q1；
in the formula:
Q3-the dosed amount of scale inhibitor;
a-a coefficient related to the hardness of calcium in water, which is recalculated by the value of a calcium ion monitor (12);
b-a coefficient relating to the pH value in the water, recalculated from the value of the concentrated water pH meter (14);
c1-scale inhibitor dosing coefficient;
d-a coefficient related to the reverse osmosis concentration multiple, and converting the coefficient into a numerical value of the reverse osmosis concentration multiple n;
Q1-a water inlet flow rate;
the method for calculating the dosage of the bactericide comprises the following steps:
Q4＝c2·Q1；
in the formula:
Q4-the dosage of the bactericide;
c2-the dosing coefficient of the bactericide;
Q1-the inflow rate of water.
10. The reverse osmosis intelligent dosing process according to claim 9, characterized in that: the calculation method of the reverse osmosis concentration multiple is as follows:
in the formula:
n-concentration multiple of reverse osmosis;
Q1-a water inlet flow rate;
Q2-concentrate flow.
11. The reverse osmosis intelligent dosing process according to claim 9, characterized in that: the concentrated water scaling tendency can be automatically judged through the Langerial index (LSI);
the LSI value calculation method is as follows:
LSI＝pH-pHs；
in the formula:
pH-the actual pH value of the concentrate at the operating temperature, measured by a concentrate pH meter (14);
pHs-CaCO3the pH value of the concentrated water when saturated;
the pHs value is calculated as follows:
pHs＝(9.30+A+B)-(C+D)；
in the formula:
a-coefficient related to dissolved solids in water, and then converted by the value of a TDS monitor (10);
b-coefficients related to the temperature of the water, recalculated from the value of the temperature transmitter (13);
c-a coefficient related to the hardness of calcium in the water, which is recalculated from the value of the calcium ion monitor (12);
d-a coefficient related to the total alkalinity in the water is converted by the numerical value of the total alkalinity monitor (11); wherein:
when LSI > 0, scaling;
when LSI is 0, neither corrosion nor scaling occurs;
when LSI < 0, corrosion occurs.
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