CN110124520B - Reverse osmosis membrane concentration ratio control system of power plant - Google Patents
Reverse osmosis membrane concentration ratio control system of power plant Download PDFInfo
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- CN110124520B CN110124520B CN201910397376.3A CN201910397376A CN110124520B CN 110124520 B CN110124520 B CN 110124520B CN 201910397376 A CN201910397376 A CN 201910397376A CN 110124520 B CN110124520 B CN 110124520B
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- 239000012528 membrane Substances 0.000 title claims abstract description 224
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 106
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 494
- 238000004519 manufacturing process Methods 0.000 claims abstract description 70
- 238000012545 processing Methods 0.000 claims abstract description 57
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 239000012141 concentrate Substances 0.000 claims abstract description 28
- 239000002351 wastewater Substances 0.000 claims abstract description 13
- 238000010612 desalination reaction Methods 0.000 claims description 32
- 238000010992 reflux Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 18
- 238000011897 real-time detection Methods 0.000 claims description 15
- 239000000084 colloidal system Substances 0.000 claims description 14
- 238000011084 recovery Methods 0.000 claims description 14
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 12
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 12
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 9
- 239000005416 organic matter Substances 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
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- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 2
- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012954 risk control Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 230000001419 dependent effect Effects 0.000 description 1
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- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000009292 forward osmosis Methods 0.000 description 1
- 150000002500 ions Chemical class 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
- 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
- B01D61/026—Reverse osmosis; Hyperfiltration comprising multiple reverse osmosis steps
-
- 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
- B01D61/08—Apparatus therefor
-
- 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
- B01D61/12—Controlling or regulating
-
- 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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/005—Valves
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
-
- 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
- C02F2209/03—Pressure
-
- 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
- C02F2209/04—Oxidation reduction potential [ORP]
-
- 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
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- 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
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the technical field of wastewater treatment, and particularly relates to a reverse osmosis membrane concentration ratio control system of a power plant, which comprises a membrane treatment unit, a water production tank, a concentrate tank, a detection instrument and a control unit; after the wastewater is treated by the membrane treatment unit, the produced water enters the produced water tank, the concentrated water enters the concentrated water tank, the concentrated water with the concentration ratio smaller than the preset concentration ratio value returns to the water inlet pipe again through the water outlet pipe and the return pipe, the detection instrument is used for detecting water quality, and the control unit is used for controlling operation. According to the invention, the operation of the membrane processing unit is detected and controlled by the detection instrument and the control unit, so that the time delay during manual valve control can be avoided, the concentration ratio of the membrane processing unit is stable, the service life of the membrane processing unit can be prolonged, and the operation cost of a power plant is saved. Meanwhile, each link of the operation of the reverse osmosis membrane concentration ratio control system of the power plant can be controlled, so that the operation state, operation early warning and operation risk of the membrane treatment unit are controlled, and the reverse osmosis membrane concentration ratio control system has the characteristic of strong control capability.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a reverse osmosis membrane concentration ratio control system of a power plant.
Background
At present, in the field of power plant wastewater treatment, when power plant wastewater is subjected to concentration and decrement treatment, membrane technologies such as reverse osmosis membranes, permselective membranes (forward osmosis), electrically driven ion membranes and the like are generally adopted for concentration. In the operation process of the membrane system, the water inlet condition and the operation condition of the membrane system are required to be monitored to prolong the service life of the membrane system, so that the membrane system stably operates. In the concentration ratio control of a reverse osmosis membrane system, a power plant often controls the concentration ratio of the membrane concentration system manually, so that not only is the labor wasted, but also the unstable quality and quantity of the concentrated water discharged by the power plant are caused. Moreover, the period of manual sampling and concentration rate measurement is long, and a manual control valve has time delay, so that the concentration rate of the membrane system is greatly fluctuated and cannot be stabilized at a control value, thereby shortening the service life of the membrane system, increasing the operation and investment cost of a power plant, and lacking monitoring of the membrane system, and being incapable of knowing and controlling the operation of the membrane system in real time.
Disclosure of Invention
The invention provides a reverse osmosis membrane concentration ratio control system of a power plant, which not only can solve the technical problem of unstable concentration ratio of a reverse osmosis membrane in the prior art, but also can solve the technical problem of lack of management and control of the reverse osmosis membrane in the prior art.
In order to solve the problems, the invention provides a reverse osmosis membrane concentration ratio control system of a power plant, which has the following technical scheme:
A reverse osmosis membrane concentration ratio control system of a power plant, comprising: the device comprises a film processing unit, a water producing tank, a concentrated water tank, a detection instrument and a control unit; the membrane treatment unit is used for introducing wastewater through a water inlet pipe, connecting with the water production tank through a water production pipe and connecting with the concentrate tank through a water drainage pipe, wherein the water drainage pipe is connected with the water inlet pipe through a return pipe, and a water pump is arranged on the return pipe; the water inlet pipe, the membrane processing unit, the water producing pipe, the water draining pipe and the concentrated water tank are provided with the detection instrument; the control unit comprises a control module, a water inlet electromagnetic valve, a water outlet electromagnetic valve and a reflux electromagnetic valve, wherein the water inlet electromagnetic valve is arranged on the water inlet pipe; the drainage electromagnetic valve is arranged on the drainage pipe and is positioned between the return pipe and the concentrate tank; the reflux electromagnetic valve is arranged on the reflux pipe; the control unit is respectively connected with the detection instrument, the water inlet electromagnetic valve, the water discharge electromagnetic valve, the water pump and the reflux electromagnetic valve and is used for providing operation control; the control module is provided with a parameter threshold, and the control module performs operation control on the film processing unit by comparing the parameter threshold with a real-time detection value of the detection instrument; and the control module selects one or more of the real-time detection values to be compared with the corresponding item of the parameter threshold value, and the comparison result is used for controlling the running state, running early warning and running risk of the membrane processing unit.
The reverse osmosis membrane concentration ratio control system of the power plant as described above further preferably comprises: the detection instrument comprises a water inlet online TDS meter, a water inlet online flowmeter, an online thermometer, a water inlet online ORP meter, a water inlet online pH meter, a water inlet online pressure meter and an online SDI tester which are arranged on the water inlet pipe; an on-line pressure meter at the inlet end of the concentrated water and an on-line pressure meter at the outlet end of the concentrated water which are arranged on the membrane treatment unit; a water production online flowmeter, a water production online TDS meter and a water production online pressure meter which are arranged on the water production pipe; a drainage online TDS meter, a drainage online flowmeter and a drainage online pressure meter which are arranged on the drainage pipe; and an on-line level gauge mounted on the concentrate tank.
The reverse osmosis membrane concentration ratio control system of the power plant as described above further preferably comprises: the membrane treatment unit comprises a first-stage reverse osmosis membrane unit and a second-stage reverse osmosis membrane unit which are connected in series; the first-stage reverse osmosis membrane unit comprises a first-stage water inlet end, a first-stage membrane component and a first-stage water outlet end; the water inlet end of the first section is provided with a water inlet, and the water inlet of the first section is connected with the water inlet pipe; the first-stage water outlet end is provided with a first-stage water outlet and a first-stage concentrated water outlet, the first-stage water outlet is connected with the water production tank through the water production pipe, and the first-stage concentrated water outlet is connected with the second-stage reverse osmosis membrane unit through a water pipe; the second-stage reverse osmosis membrane unit comprises a second-stage water inlet end, a second-stage membrane assembly and a second-stage water outlet end; the second-section water inlet end is provided with a second-section water inlet which is connected with the first-section concentrated water outlet through the water conveying pipe; the second-section water outlet end is provided with a second-section water outlet and a second-section concentrated water outlet, the second-section water outlet is connected with the water production tank through the water production pipe, and the second-section concentrated water outlet is connected with the concentrated water tank through the water drainage pipe; the control unit also comprises a water delivery on-line pressure instrument which is arranged on the water delivery pipe and connected with the control module.
The reverse osmosis membrane concentration ratio control system of the power plant as described above further preferably comprises: the real-time detection value comprises a real-time TDS value of the water inlet pipe detected by the online TDS meter; the real-time inflow water flow value detected by the inflow water online flowmeter; the real-time water inlet temperature value detected by the online thermometer; the real-time influent ORP value detected by the influent online ORP instrument; the real-time inlet water pH value detected by the inlet water online pH meter; the real-time water inlet pressure value detected by the water inlet on-line pressure instrument; the real-time inlet water SDI value detected by the online SDI detector; the real-time concentrated water inlet end pressure value detected by the concentrated water inlet end on-line pressure instrument; the real-time concentrated water outlet end pressure value detected by the concentrated water outlet end on-line pressure instrument; the real-time produced water flow value detected by the produced water online flowmeter; the real-time TDS value of the water production pipe detected by the online TDS meter of the produced water; the real-time produced water pressure value detected by the produced water online pressure instrument; the drainage pipe real-time TDS value detected by the drainage online TDS meter; the real-time drainage flow value detected by the drainage online flowmeter; the real-time drainage pressure value detected by the drainage online pressure instrument; the real-time liquid level value of the concentrated water tank is detected by the online liquid level meter; the real-time water delivery pressure value detected by the water delivery on-line pressure instrument; the method also comprises the steps of real-time desalination rate, real-time recovery rate, real-time concentration doubling value, membrane treatment unit differential pressure and membrane treatment unit differential pressure of each section; wherein the real-time desalination rate is the ratio of the difference between the real-time TDS value of the water inlet pipe and the real-time TDS value of the water producing pipe to the real-time TDS value of the water inlet pipe; the real-time recovery rate is the ratio of the real-time produced water flow value to the real-time inlet water flow value; the real-time concentration multiplying power value is the ratio of the real-time TDS value of the drain pipe to the real-time TDS value of the water inlet pipe; the pressure difference of the membrane treatment unit is the difference value between the pressure value of the real-time concentrated water inlet end and the pressure value of the real-time concentrated water outlet end; the differential pressure of each section of the membrane treatment unit comprises a differential pressure of a first section of reverse osmosis membrane unit and a differential pressure of a second section of reverse osmosis membrane unit; the differential pressure of the reverse osmosis membrane unit is the difference value between the real-time concentrated water inlet end pressure value and the real-time water delivery pressure value; and the differential pressure of the two-stage reverse osmosis membrane unit is the difference value between the real-time water delivery pressure value and the real-time concentrated water outlet end pressure value.
The reverse osmosis membrane concentration ratio control system of the power plant as described above further preferably comprises: the control module controls the running state of the membrane processing unit by comparing the parameter threshold with the real-time liquid level value and the real-time concentration doubling value of the concentrate tank; the control module closes the water inlet electromagnetic valve when the real-time liquid level value of the concentrate tank is higher than the upper limit of the parameter threshold value; the control module opens the water inlet electromagnetic valve when the real-time liquid level value of the concentrate tank is lower than the lower limit of the parameter threshold value; when the real-time concentration multiplying power value is not lower than the parameter threshold value, the control module opens the drainage electromagnetic valve to drain the concentrated water into the concentrated water tank; and when the real-time concentration multiple value is lower than the parameter threshold value, the control module starts the water pump and the reflux electromagnetic valve on the reflux pipe to convey the concentrated water back to the water inlet pipe.
The reverse osmosis membrane concentration ratio control system of the power plant as described above further preferably comprises: the control module performs operation early warning control on the membrane processing unit by comparing the parameter threshold with the drain pipe real-time TDS value, the real-time drainage flow value, the real-time water inflow temperature value, the real-time water inflow ORP value, the real-time water inflow pH value, the real-time water inflow pressure value, the real-time drainage pressure value, the real-time concentrate inlet end pressure value, the real-time concentrate outlet end pressure value, the water production pipe real-time TDS value, the water inlet pipe real-time TDS value, the real-time water production flow value, the real-time water production pressure value, the real-time water inflow SDI value, the real-time desalination rate and the real-time recovery rate; the control module outputs an alarm signal to the outside when the real-time TDS value of the drain pipe is lower than the lower limit of the parameter threshold; when the real-time drainage flow value is higher than the real-time water inflow flow value, the control module outputs an alarm signal to the outside; the control module outputs an alarm signal to the outside when the real-time water inlet temperature value is higher than the upper limit of the parameter threshold value or lower than the lower limit of the parameter threshold value; the control module outputs an alarm signal or a shutdown signal to the outside when the real-time influent ORP value is higher than the upper limit of the parameter threshold; the control module outputs an alarm signal to the outside when the pH value of the real-time inflow water is higher than the upper limit of the parameter threshold value or lower than the lower limit of the parameter threshold value; the control module outputs an alarm signal or a stop signal outwards when the real-time water inlet pressure value is higher than the upper limit of the parameter threshold value; the control module outputs an alarm signal or a stop signal to the outside when the real-time drainage pressure value is higher than the upper limit of the parameter threshold; the control module outputs a shutdown signal to the outside when the real-time concentrated water inlet end pressure value is lower than the lower limit of the parameter threshold value and/or when the real-time concentrated water outlet end pressure value is higher than the upper limit of the parameter threshold value; the control module outputs an alarm signal to the outside when the real-time desalination rate is lower than the lower limit of the parameter threshold; the real-time recovery rate is higher than the upper limit of the parameter threshold value, and the control module outputs an alarm signal to the outside; the control module outputs an alarm signal to the outside when the real-time water production pressure value is higher than the upper limit of the parameter threshold; and the control module outputs an alarm signal to the outside when the SDI value of the real-time water inlet is higher than the upper limit of the parameter threshold.
The reverse osmosis membrane concentration ratio control system of the power plant as described above further preferably comprises: the control module controls the operation risk of the membrane processing unit by comparing the parameter threshold value with the real-time detection value, wherein the operation risk comprises colloid pollution risk, organic matter pollution risk and scaling pollution risk.
The reverse osmosis membrane concentration ratio control system of the power plant as described above further preferably comprises: the control module controls the colloid pollution risk of the membrane processing unit by comparing the parameter threshold with the real-time water inlet pressure value, the real-time water production flow value, the membrane processing unit pressure difference and the real-time desalination rate; and if the real-time water inlet pressure value rises above the parameter threshold, the real-time water production flow value falls above the parameter threshold, the membrane processing unit differential pressure rises above the parameter threshold, and the real-time desalination rate meets the parameter threshold, the control module judges that colloid pollution occurs and outputs colloid pollution alarm signals to the outside.
The reverse osmosis membrane concentration ratio control system of the power plant as described above further preferably comprises: the control module controls the risk of organic pollution to the membrane processing unit by comparing the parameter threshold with the real-time water production flow value, the real-time water inlet pressure value, the real-time desalination rate and the pressure difference of each section of the membrane processing unit; and simultaneously, the real-time produced water flow value is reduced to exceed the parameter threshold, the real-time inlet water pressure value is increased to exceed the parameter threshold, the real-time desalination rate meets the parameter threshold, the differential pressure of each section of the membrane processing unit is increased to exceed the parameter threshold, the differential pressure rising amplitude of the one section of reverse osmosis membrane unit is larger than that of the two sections of reverse osmosis membrane unit, and the control module judges that organic pollution occurs and outputs an organic pollution risk alarm signal to the outside.
The reverse osmosis membrane concentration ratio control system of the power plant as described above further preferably comprises: the control module controls the scale pollution risk of the membrane treatment unit by comparing the parameter threshold value with the real-time water inlet pressure value, the real-time water production flow value, the real-time desalination rate and the pressure difference of each section of the membrane treatment unit, wherein the scale pollution risk comprises sulfate scale pollution risk, carbonate scale pollution risk and silicate scale pollution risk; the control module judges that sulfate scale pollution and/or carbonate scale pollution occur when the differential pressure of the two-stage reverse osmosis membrane unit rises above the parameter threshold value, and outputs a sulfate scale pollution risk and carbonate scale pollution risk alarm signal to the outside; the control module judges that silicate scale pollution occurs and outputs a silicate scale pollution risk alarm signal to the outside when the real-time water inlet pressure value rises, the real-time water production flow value falls and the real-time desalination rate falls, the differential pressure of the first-stage reverse osmosis membrane unit meets the parameter threshold value, and the differential pressure of the second-stage reverse osmosis membrane unit falls beyond the parameter threshold value.
Analysis shows that compared with the prior art, the invention has the following advantages:
the invention detects and controls the operation of the membrane processing unit through the detection instrument and the control unit, can automatically control the concentration ratio of the membrane processing unit, saves labor, is convenient to install, is flexible and reliable to operate, avoids time delay when a valve is manually controlled, and ensures that the concentration ratio of the membrane processing unit is stable, thereby prolonging the service life of the membrane processing unit and saving the operation cost of a power plant. In addition, the detection instrument and the control unit are matched for use, and each link of the operation of the reverse osmosis membrane concentration ratio control system of the power plant can be controlled, so that the operation state, the operation early warning and the operation risk of the membrane treatment unit are controlled, and the reverse osmosis membrane concentration ratio control system has the characteristics of high controllable degree and strong control capability. Meanwhile, the membrane treatment unit is a first-stage reverse osmosis membrane unit and a second-stage reverse osmosis membrane unit which are connected in series, so that the concentration workload can be reasonably distributed, the operation load of a single reverse osmosis membrane unit is reduced, the overall operation efficiency of the membrane treatment unit is improved, and the risk resistance of the membrane treatment unit is improved.
Drawings
FIG. 1 is a schematic diagram of the connection of a reverse osmosis membrane concentration ratio control system of a power plant of the present invention;
FIG. 2 is a schematic illustration of the internal connections of a membrane processing unit of the present invention;
FIG. 3 is a schematic diagram of the structure of a section of a reverse osmosis membrane unit of the present invention;
In the figure: 1-a water inlet electromagnetic valve; 2-a water inlet pipe; 3-an online TDS meter for water inflow; 4-an online flowmeter for water inflow; 5-an online thermometer; 6-an online ORP meter for water inflow; 7-an online pH meter for water inflow; 8-an on-line water inlet pressure meter; 9-an online SDI tester; 10-an online pressure instrument at the inlet end of the concentrated water; 11-a membrane treatment unit; 12-an online pressure instrument at the outlet end of the concentrated water; 13-an online flowmeter of produced water; 14-a water production online TDS meter; 15-a water production on-line pressure instrument; 16-a drain pipe; 17-a water producing pipe; 18-a water producing tank; 19-draining an online TDS meter; 20-a drain on-line flow meter; 21-a drainage on-line pressure gauge; 22-a drain solenoid valve; 23-an on-line level gauge; 24-a concentrated water tank; 25-return pipe; 26-a return solenoid valve; 27-a water pump; 28-a control module; 29-a water delivery pipe; 30-a water delivery on-line pressure meter; 31-a section of reverse osmosis membrane unit; 32-a two-stage reverse osmosis membrane unit; 33-a water inlet end; 34-a one-stage membrane module; 35-a section of water outlet end; 36-a section of water outlet; 37-a section of concentrated water outlet.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, only for convenience in describing the present invention, and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.
In the present invention, the abbreviations for English are as follows: TDS is an abbreviation for Total dissolved solids, total dissolved solids; ORP is an abbreviation for oxidation-Reduction Potential, which is the oxidation-reduction potential; SDI is an abbreviation for SILTING DENSITY Index, which is the sludge density Index; the pH is an abbreviation of hydrogen ion concentration, which is the hydrogen ion concentration index; COD is an abbreviation for Chemical Oxygen Demand, chemical oxygen demand.
As shown in fig. 1 to 3, fig. 1 is a schematic connection diagram of a reverse osmosis membrane concentration ratio control system of a power plant according to the present invention; FIG. 2 is a schematic illustration of the internal connections of a membrane processing unit of the present invention; fig. 3 is a schematic structural diagram of a section of reverse osmosis membrane unit according to the present invention.
As shown in fig. 1, the invention provides a reverse osmosis membrane concentration ratio control system of a power plant, which mainly comprises a membrane treatment unit 11, a water production tank 18, a concentrate tank 24, a detection instrument and a control unit; the membrane treatment unit 11 is used for introducing wastewater through the water inlet pipe 2, is connected with the water production tank 18 through the water production pipe 17, is connected with the concentrate tank 24 through the water discharge pipe 16, and is connected with the water inlet pipe 2 through the return pipe 25, and the water pump 27 is arranged on the return pipe 25; the water inlet pipe 2, the membrane treatment unit 11, the water producing pipe 17, the water discharging pipe 16 and the concentrate tank 24 are provided with detection instruments; the control unit comprises a control module 28, a water inlet electromagnetic valve 1, a water outlet electromagnetic valve 22 and a reflux electromagnetic valve 26, wherein the water inlet electromagnetic valve 1 is arranged on the water inlet pipe 2; a drain solenoid valve 22 is mounted on the drain pipe 16 between a return pipe 25 and a concentrate tank 24; a return solenoid valve 26 is mounted on the return pipe 25; the control unit is respectively connected with the detection instrument, the water inlet electromagnetic valve 1, the water outlet electromagnetic valve 22, the water pump 27 and the reflux electromagnetic valve 26 and is used for providing operation control; the control module 28 is provided with a parameter threshold, and the control module 28 controls the operation of the film processing unit 11 by comparing the parameter threshold with a real-time detection value of the detection instrument; the control module 28 selects one or more of the real-time detection values to compare with the corresponding item of the parameter threshold value, and controls the operation state, the operation early warning and the operation risk of the film processing unit 11 according to the comparison result.
Specifically, the reverse osmosis membrane concentration ratio control system for the power plant detects the operation parameters of the membrane processing unit 11 through the detection instrument, and controls the operation of the membrane processing unit 11 through the control unit. When the water inlet electromagnetic valve 1 is opened, wastewater enters the membrane treatment unit 11 through the water inlet pipe 2, the membrane treatment unit 11 carries out concentration treatment on the wastewater, the treated wastewater is divided into produced water and concentrated water, the produced water enters the produced water tank 18 through the produced water pipe 17 and is intensively discharged by the produced water tank 18, the concentrated water enters the concentrated water tank 24 through the water outlet pipe 16 and the water outlet electromagnetic valve 22, the concentrated water in the concentrated water tank 24 reaches a preset concentration ratio, and the concentrated water is intensively discharged by the concentrated water tank 24, so that evaporation crystallization treatment or flue gas waste heat evaporation treatment can be carried out, and water saving and emission reduction are realized. The detection instrument detects the water quality in the water inlet pipe 2 and the water outlet pipe 16, and the control module 28 analyzes the detection data to obtain the real-time concentration multiple value of the membrane processing unit 11 in real time. The control module 28 is provided with a parameter threshold value which defines a preset concentration multiple value, and when the real-time concentration multiple value is not smaller than the preset concentration multiple value, the drainage solenoid valve 22 is opened, and concentrated water enters the concentrated water tank 24 through the drainage pipe 16; when the real-time concentration multiple value is smaller than the preset concentration multiple value, the drainage electromagnetic valve 22 is closed, the water pump 27 operates first, then the reflux electromagnetic valve 26 is opened, and the concentrated water enters the water inlet pipe 2 from the reflux pipe 25 for concentration again. The invention can automatically control the concentration ratio of the membrane processing unit 11 by detecting and controlling the operation of the membrane processing unit 11 through the detecting instrument and the control unit, saves labor, is convenient to install and flexible and reliable to operate, avoids time delay when a valve is manually controlled, and ensures that the concentration ratio of the membrane processing unit 11 is stable, thereby prolonging the service life of the membrane processing unit 11 and saving the operation cost of a power plant. Meanwhile, the service life of the membrane treatment unit 11 is not only dependent on concentration ratio, but also related to running conditions and wastewater parameters, and the detection instrument and the control unit are used together to control each link of the operation of the reverse osmosis membrane concentration ratio control system of the power plant, so that the running state, running early warning and running risk of the membrane treatment unit 11 are controlled, and the membrane treatment unit has the characteristics of high controllable degree and strong control capability.
In order to reduce the operation load of the membrane treatment unit 11 and to improve the operation efficiency and the risk resistance of the membrane treatment unit 11, as shown in fig. 1 to 3, the membrane treatment unit 11 includes a first-stage reverse osmosis membrane unit 31 and a second-stage reverse osmosis membrane unit 32 connected in series; the first-stage reverse osmosis membrane unit 31 comprises a first-stage water inlet end 33, a first-stage membrane component 34 and a first-stage water outlet end 35; the water inlet end 33 is provided with a water inlet which is connected with the water inlet pipe 2; the first-stage water outlet end 35 is provided with a first-stage water outlet 36 and a first-stage concentrated water outlet 37, the first-stage water outlet 36 is connected with the water production tank 18 through the water production pipe 17, and the first-stage concentrated water outlet 37 is connected with the second-stage reverse osmosis membrane unit 32 through the water delivery pipe 29; the second-stage reverse osmosis membrane unit 32 comprises a second-stage water inlet end, a second-stage membrane assembly and a second-stage water outlet end; the water inlet end of the second section is provided with a second section water inlet which is connected with a first section concentrated water outlet 37 through a water pipe 29; the second-section water outlet end is provided with a second-section water outlet and a second-section concentrated water outlet, the second-section water outlet is connected with the water production tank 18 through the water production pipe 17, and the second-section concentrated water outlet is connected with the concentrated water tank 24 through the water drainage pipe 16. The water inlet pipe 2, the water outlet pipe 16, the water delivery pipe 29 and the return pipe 25 are made of PVC steel wire pipes and are fixed by pipe hoops. The invention can reasonably distribute the concentration workload by arranging the first-stage reverse osmosis membrane unit 31 and the second-stage reverse osmosis membrane unit 32 which are connected in series, lighten the operation load of a single reverse osmosis membrane unit, improve the overall operation efficiency of the membrane treatment unit 11 and improve the risk resistance of the membrane treatment unit 11.
In order to facilitate the detection of the operation condition of the membrane processing unit 11, as shown in fig. 1, the detection instrument comprises a water inlet online TDS meter 3, a water inlet online flowmeter 4, an online thermometer 5, a water inlet online ORP meter 6, a water inlet online pH meter 7, a water inlet online pressure meter 8 and an online SDI tester 9 which are installed on the water inlet pipe 2; a concentrated water inlet end on-line pressure meter 10 and a concentrated water outlet end on-line pressure meter 12 mounted on the membrane treatment unit 11; a water production on-line flowmeter 13, a water production on-line TDS meter 14 and a water production on-line pressure meter 15 which are arranged on a water production pipe 17; a drain on-line TDS meter 19, a drain on-line flowmeter 20, a drain on-line pressure meter 21 mounted on the drain pipe 16; and an on-line level gauge 23 mounted on the concentrate tank 24, a water delivery on-line pressure gauge 30 mounted on the water delivery pipe 29. The corresponding relation between the detection instrument and the real-time detection value is as follows: the online TDS meter 3 for water inflow detects the real-time TDS value of the water inflow pipe; the inflow online flowmeter 4 detects a real-time inflow flow value; the online thermometer 5 detects the real-time water inlet temperature value; the online inlet water ORP meter 6 detects the real-time inlet water ORP value; the online pH meter 7 of the inflow detects the pH value of the real-time inflow; the on-line inlet water pressure meter 8 detects a real-time inlet water pressure value; the online SDI determinator 9 detects the real-time SDI value of the water; the online pressure instrument 10 of the concentrated water inlet end detects the pressure value of the concentrated water inlet end in real time; the online pressure instrument 12 of the concentrated water outlet detects the real-time pressure value of the concentrated water outlet; the produced water online flowmeter 13 detects a real-time produced water flow value; the online TDS meter 14 for producing water detects the real-time TDS value of the water producing pipe; the water production online pressure instrument 15 detects a real-time water production pressure value; the drainage online TDS meter 19 detects a drainage pipe real-time TDS value; the drain on-line flow meter 20 detects a real-time drain flow value; the drainage on-line pressure meter 21 detects a real-time drainage pressure value; the online liquid level meter 23 detects the real-time liquid level value of the concentrate tank; the water delivery on-line pressure meter 30 detects a real-time water delivery pressure value. According to the invention, the detection instrument is arranged in the reverse osmosis membrane concentration ratio control system of the power plant, so that automatic control is facilitated. Further, each real-time detection value is combined and calculated by the control module 28, so that the real-time desalination rate, the real-time recovery rate, the real-time concentration doubling value, the differential pressure of the membrane processing unit 11 and the differential pressure of each section of the membrane processing unit 11 can be obtained. Wherein, the real-time desalination rate is the ratio of the difference between the real-time TDS value of the water inlet pipe and the real-time TDS value of the water producing pipe to the real-time TDS value of the water inlet pipe; the real-time recovery rate is the ratio of the real-time water production flow value to the real-time water inflow flow value; the real-time concentration multiplier value is the ratio of the real-time TDS value of the drain pipe to the real-time TDS value of the water inlet pipe; the pressure difference of the membrane treatment unit 11 is the difference value between the real-time concentrated water inlet end pressure value and the real-time concentrated water outlet end pressure value; the differential pressure of each section of the membrane treatment unit 11 comprises a differential pressure of a first section of reverse osmosis membrane unit and a differential pressure of a second section of reverse osmosis membrane unit; the differential pressure of the first section of reverse osmosis membrane unit is the difference value between the real-time concentrated water inlet end pressure value and the real-time water delivery pressure value; the differential pressure of the two-stage reverse osmosis membrane unit is the difference value between the real-time water delivery pressure value and the real-time concentrated water outlet end pressure value.
According to the invention, the detection instrument is arranged on the reverse osmosis membrane concentration ratio control system of the power plant, and the control module 28 is provided with the threshold range corresponding to the real-time detection value of the detection instrument and the threshold range corresponding to the real-time detection value obtained by combination and calculation of the control module 28, so that the operation state, the operation early warning and the operation risk of the reverse osmosis membrane concentration ratio control system of the power plant can be controlled. The threshold range comprises a preset fluctuation range of a real-time TDS value, a real-time inflow flow value, a real-time inflow temperature value, a real-time inflow ORP value, a real-time inflow pH value, a real-time inflow pressure value, a real-time inflow SDI value, a real-time concentrated water inlet end pressure value, a real-time concentrated water outlet end pressure value, a real-time water production flow value, a real-time TDS value of a water production pipe, a real-time water production pressure value, a real-time TDS value of a drain pipe, a real-time drainage flow value, a real-time drainage pressure value, a real-time liquid level value of a concentrated water tank, a real-time water delivery pressure value, a real-time desalination rate, a real-time recovery rate, a real-time concentration multiple value, a membrane processing unit 11 differential pressure and each section differential pressure of the membrane processing unit 11.
In controlling the operation state, as shown in fig. 1, the control module 28 controls the operation state of the membrane processing unit 11 by comparing the parameter threshold value with the real-time liquid level value and the real-time concentration doubling value of the concentrate tank; when the real-time liquid level value of the concentrate tank is higher than the upper limit of the parameter threshold value, the control module 28 closes the water inlet electromagnetic valve 1; the control module 28 opens the water inlet electromagnetic valve 1 when the real-time liquid level value of the concentrate tank is lower than the lower limit of the parameter threshold value; when the real-time concentration multiplier value is not lower than the parameter threshold value, the control module 28 opens the drainage electromagnetic valve 22 to drain the concentrated water into the concentrated water tank 24; when the real-time concentration multiple value is lower than the parameter threshold value, the control module 28 starts the water pump 27 and the reflux electromagnetic valve 26 on the reflux pipe 25 to convey the concentrated water back to the water inlet pipe 2.
When controlling operation and early warning, as shown in fig. 1 to 3, the control module 28 performs operation and early warning control on the membrane processing unit 11 by comparing the parameter threshold value with a drain pipe real-time TDS value, a real-time drainage flow value, a real-time water inlet temperature value, a real-time water inlet ORP value, a real-time water inlet pH value, a real-time water inlet pressure value, a real-time drainage pressure value, a real-time concentrate inlet end pressure value, a real-time concentrate outlet end pressure value, a water production pipe real-time TDS value, a water inlet pipe real-time TDS value, a real-time water production flow value, a real-time water production pressure value, a real-time water inlet SDI value, a real-time desalination rate and a real-time recovery rate; when the real-time TDS value of the drain pipe is lower than the lower limit of the parameter threshold, the control module 28 outputs an alarm signal to the outside; when the real-time drainage flow value is higher than the real-time water inflow flow value, the control module 28 outputs an alarm signal to the outside; when the real-time water inlet temperature value is higher than the upper limit of the parameter threshold value or lower than the lower limit of the parameter threshold value, the control module 28 outputs an alarm signal outwards, and in one embodiment of the invention, when the real-time water inlet temperature value is higher than 25 ℃ or lower than 10 ℃, the control module 28 outputs an alarm signal outwards, and the parameter threshold value of the membrane processing unit 11 is 10 ℃ to 25 ℃; when the real-time influent ORP value is higher than the upper limit of the parameter threshold, the control module 28 outputs an alarm signal or a shutdown signal to the outside, and in one embodiment of the present invention, when the real-time influent ORP value is higher than 200MV, the control module 28 outputs an alarm signal to the outside, and when the real-time influent ORP value is higher than 250MV, the control module 28 outputs a shutdown signal to the outside; when the pH value of the real-time inflow water is higher than the upper limit of the parameter threshold or lower than the lower limit of the parameter threshold, the control module 28 outputs an alarm signal to the outside, and in one embodiment of the invention, when the pH value of the real-time inflow water is higher than 9 or lower than 6, the control module 28 outputs an alarm signal to the outside; when the real-time water inlet pressure value is higher than the upper limit of the parameter threshold, the control module 28 outputs an alarm signal or a shutdown signal to the outside, and in one embodiment of the invention, the real-time water inlet pressure value is evaluated according to the percentage of the preset pressure value, when the real-time water inlet pressure value exceeds 115%, the control module 28 outputs the alarm signal to the outside, and when the real-time water inlet pressure value exceeds 125%, the control module 28 outputs the shutdown signal to the outside; when the real-time drainage pressure value is higher than the upper limit of the parameter threshold, the control module 28 outputs an alarm signal or a shutdown signal to the outside, in one embodiment of the invention, the real-time drainage pressure value is evaluated according to the percentage of the preset pressure value, when the real-time drainage pressure value exceeds 115%, the control module 28 outputs an alarm signal to the outside, and when the real-time drainage pressure value exceeds 125%, the control module 28 outputs a shutdown signal to the outside; when the real-time thick water inlet end pressure value is lower than the lower limit of the parameter threshold value and/or the real-time thick water outlet end pressure value is higher than the upper limit of the parameter threshold value, the control module 28 outputs a stop signal to the outside, and in one embodiment of the invention, when the real-time thick water inlet end pressure value is lower than 0.1MPa, the control module 28 outputs a stop signal to the outside, and when the real-time thick water outlet end pressure value is higher than 0.1 MPa; when the real-time desalination rate is lower than the lower limit of the parameter threshold, the control module 28 outputs an alarm signal to the outside, and in one embodiment of the invention, when the real-time desalination rate is lower than 98%, the control module 28 outputs an alarm signal to the outside; when the real-time recovery rate is higher than the upper limit of the parameter threshold, the control module 28 outputs an alarm signal to the outside, and in one embodiment of the invention, when the real-time recovery rate is higher than 70%, the control module 28 outputs an alarm signal to the outside; when the real-time water production pressure value is higher than the upper limit of the parameter threshold, the control module 28 outputs an alarm signal to the outside; when the real-time inlet SDI value is higher than the upper limit of the parameter threshold, the control module 28 outputs an alarm signal to the outside, and in one embodiment of the present invention, when the real-time inlet SDI value is higher than 3, there is a risk of colloid pollution at this time, the control module 28 outputs an alarm signal to the outside. Further, when the differential pressure of the reverse osmosis membrane unit 31 is higher than the upper limit of the parameter threshold, the control module 28 outputs an alarm signal to the outside; when the differential pressure of the two-stage reverse osmosis membrane unit 32 is higher than the upper limit of the parameter threshold, the control module 28 outputs an alarm signal to the outside, and in one embodiment of the present invention, the evaluation is performed by using the percentage of the preset differential pressure value, and when the differential pressure of the one-stage reverse osmosis membrane unit 31 and/or the differential pressure of the two-stage reverse osmosis membrane unit 32 is higher than 115%, the control module 28 outputs an alarm signal to the outside.
In controlling the operational risk, as shown in fig. 1 to 3, the control module 28 performs operational risk control on the membrane processing unit 11 by comparing the parameter threshold value with the real-time detection value, and the operational risk includes a colloid pollution risk, an organic matter pollution risk, and a scale pollution risk.
For the risk of colloid pollution, the fouling of the first section of reverse osmosis membrane unit 31 of the membrane treatment unit 11 is more serious than that of the second section of reverse osmosis membrane unit 32, and the fouling usually occurs in surface water sources or water sources with higher turbidity, as shown in fig. 1 to 3, the control module 28 controls the colloid pollution risk of the membrane treatment unit 11 by comparing a parameter threshold with a real-time inlet water pressure value, a real-time water yield value, a differential pressure of the membrane treatment unit 11 and a real-time desalination rate; at the same time, the real-time inlet water pressure value rises above the parameter threshold, the real-time output water flow value falls above the parameter threshold, the pressure difference (the pressure difference of a section of reverse osmosis membrane unit) of the membrane processing unit 11 rises above the parameter threshold, and the real-time desalination rate meets the parameter threshold, the control module 28 judges that colloid pollution occurs, outputs colloid pollution alarm signals to the outside, and reminds people to clean.
For the risk of organic pollution, both the first-stage reverse osmosis membrane unit 31 and the second-stage reverse osmosis membrane unit 32 of the membrane treatment unit 11 occur, and the occurrence of the first-stage reverse osmosis membrane unit 31 is more general and serious than the second-stage reverse osmosis membrane unit 32. Moreover, organic contamination usually occurs in water with high COD content (more than 10 mg/L) such as coal chemical wastewater, coking wastewater, printing and dyeing wastewater, papermaking wastewater and the like, and is accompanied by microbial contamination (microbial contamination is serious with rising water temperature, that is, microbial contamination is serious in summer compared with winter, microbial contamination is often accompanied by fishy smell, and the smell of burned hair or protein is generated during sampling and burning). The organic matter pollution is represented by the sticky sliding of the pollutants on the inner wall of the section of water inlet end 33, and the sticky sliding of the inner wall of the section of water inlet end 33 is higher than that of the section of water outlet end 35. As shown in fig. 1 to 3, the control module 28 performs organic pollution risk control on the membrane processing unit 11 by comparing the parameter threshold value with the real-time water production flow value, the real-time water inlet pressure value, the real-time desalination rate and the pressure difference of each section of the membrane processing unit 11; the real-time water output value is reduced to exceed the parameter threshold, the real-time water inlet pressure value is increased to exceed the parameter threshold, the real-time desalination rate meets the parameter threshold, the differential pressure of each section of the membrane processing unit 11 is increased to exceed the parameter threshold, the differential pressure rising amplitude of the first section of reverse osmosis membrane unit is larger than that of the second section of reverse osmosis membrane unit, and the control module 28 judges that organic pollution occurs and outputs an organic pollution risk alarm signal to the outside.
For the scale pollution risk, as shown in fig. 1 to 3, the control module 28 controls the scale pollution risk of the membrane treatment unit 11 by comparing the parameter threshold value with the real-time inlet water pressure value, the real-time produced water flow value, the real-time desalination rate and the differential pressure of each section of the membrane treatment unit 11, wherein the scale pollution risk comprises sulfate scale pollution risk, carbonate scale pollution risk and silicate scale pollution risk; if the differential pressure of the two-stage reverse osmosis membrane unit rises above the parameter threshold value, the control module 28 judges that sulfate scale pollution and/or carbonate scale pollution occur, and outputs an alarm signal of the risk of sulfate scale pollution and the risk of carbonate scale pollution to the outside, hydrochloric acid is adopted for dissolution when distinguishing the sulfate scale pollution and the carbonate scale pollution, the reaction is violent, bubbles are generated and can be dissolved to form carbonate scale pollution, and the pollution is basically unchanged to form sulfate scale pollution (carbonate reacts with hydrochloric acid to generate carbon dioxide in chemical reaction, so that the reaction is violent, and sulfate does not generate carbon dioxide, so that the pollution is basically unchanged); the control module 28 judges that silicate scale pollution occurs and outputs a silicate scale pollution risk alarm signal to the outside when the real-time inflow pressure value rises, the real-time water production flow value falls and the real-time desalination rate falls, the differential pressure of the first-stage reverse osmosis membrane unit meets the parameter threshold value and the differential pressure of the second-stage reverse osmosis membrane unit falls beyond the parameter threshold value.
It should be further noted that the names of the online TDS meter 3, the online water inlet flowmeter 4, the online thermometer 5, the online water inlet ORP meter 6, the online water inlet pH meter 7, the online water inlet pressure meter 8, the online SDI meter 9, the online concentrated water inlet pressure meter 10, the online concentrated water outlet pressure meter 12, the online water production flowmeter 13, the online TDS meter 14, the online water production pressure meter 15, the online water drainage TDS meter 19, the online water drainage flowmeter 20, the online water drainage pressure meter 21, the online liquid level meter 23, the online water delivery pressure meter 30, the water production tank 18, the concentrated water tank 24, the control module 28, the water inlet solenoid valve 1, the water drainage solenoid valve 22, the reflux solenoid valve 26, the one-stage reverse osmosis membrane unit 31, the two-stage reverse osmosis membrane unit 32, the water inlet pipe 2, the water production pipe 17, the water delivery pipe 29 and the water drainage pipe 16 are for convenience of description, and not limitation of components, and those skilled in the art can apply suitable components and assemble, connect and operate according to the description of the functions of the components.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Claims (9)
1. A reverse osmosis membrane concentration ratio control system of a power plant, comprising:
the device comprises a film processing unit, a water producing tank, a concentrated water tank, a detection instrument and a control unit;
The membrane treatment unit is used for introducing wastewater through a water inlet pipe, connecting with the water production tank through a water production pipe and connecting with the concentrate tank through a water drainage pipe, wherein the water drainage pipe is connected with the water inlet pipe through a return pipe, and a water pump is arranged on the return pipe;
the water inlet pipe, the membrane processing unit, the water producing pipe, the water draining pipe and the concentrated water tank are provided with the detection instrument;
The detection instrument comprises a water inlet online TDS meter arranged on the water inlet pipe, a water drainage online TDS meter arranged on the water drainage pipe and an online liquid level meter arranged on the concentrate tank;
The inlet pipe real-time TDS value detected by the inlet on-line TDS meter;
the drainage pipe real-time TDS value detected by the drainage online TDS meter;
The online liquid level meter detects the real-time liquid level value of the concentrated water tank;
the ratio of the real-time TDS value of the drain pipe to the real-time TDS value of the water inlet pipe is a real-time concentration doubling value;
The control unit comprises a control module, a water inlet electromagnetic valve, a water outlet electromagnetic valve and a reflux electromagnetic valve, wherein the water inlet electromagnetic valve is arranged on the water inlet pipe;
The drainage electromagnetic valve is arranged on the drainage pipe and is positioned between the return pipe and the concentrate tank;
The reflux electromagnetic valve is arranged on the reflux pipe;
The control unit is respectively connected with the detection instrument, the water inlet electromagnetic valve, the water discharge electromagnetic valve, the water pump and the reflux electromagnetic valve and is used for providing operation control;
The control module is provided with a parameter threshold, and the control module performs operation control on the film processing unit by comparing the parameter threshold with a real-time detection value of the detection instrument;
The control module controls the running state of the membrane processing unit by comparing the parameter threshold with the real-time liquid level value and the real-time concentration doubling value of the concentrate tank;
the control module closes the water inlet electromagnetic valve when the real-time liquid level value of the concentrate tank is higher than the upper limit of the parameter threshold value;
The control module opens the water inlet electromagnetic valve when the real-time liquid level value of the concentrate tank is lower than the lower limit of the parameter threshold value;
when the real-time concentration multiplying power value is not lower than the parameter threshold value, the control module opens the drainage electromagnetic valve to drain the concentrated water into the concentrated water tank;
when the real-time concentration multiple value is lower than the parameter threshold value, the control module starts the water pump and the reflux electromagnetic valve on the reflux pipe to convey the concentrated water back to the water inlet pipe;
and the control module selects one or more of the real-time detection values to be compared with the corresponding item of the parameter threshold value, and the comparison result is used for controlling the running state, running early warning and running risk of the membrane processing unit.
2. The reverse osmosis membrane concentration ratio control system of a power plant according to claim 1, characterized in that:
The detection instrument further comprises an online water inlet flowmeter, an online thermometer, an online water inlet ORP instrument, an online water inlet pH instrument, an online water inlet pressure instrument and an online SDI tester which are arranged on the water inlet pipe;
An on-line pressure meter at the inlet end of the concentrated water and an on-line pressure meter at the outlet end of the concentrated water which are arranged on the membrane treatment unit;
a water production online flowmeter, a water production online TDS meter and a water production online pressure meter which are arranged on the water production pipe;
and the drainage on-line flowmeter and the drainage on-line pressure meter are arranged on the drainage pipe.
3. The reverse osmosis membrane concentration ratio control system of a power plant according to claim 2, characterized in that:
the membrane treatment unit comprises a first-stage reverse osmosis membrane unit and a second-stage reverse osmosis membrane unit which are connected in series;
the first-stage reverse osmosis membrane unit comprises a first-stage water inlet end, a first-stage membrane component and a first-stage water outlet end;
the water inlet end of the first section is provided with a water inlet, and the water inlet of the first section is connected with the water inlet pipe;
The first-stage water outlet end is provided with a first-stage water outlet and a first-stage concentrated water outlet, the first-stage water outlet is connected with the water production tank through the water production pipe, and the first-stage concentrated water outlet is connected with the second-stage reverse osmosis membrane unit through a water pipe;
the second-stage reverse osmosis membrane unit comprises a second-stage water inlet end, a second-stage membrane assembly and a second-stage water outlet end;
the second-section water inlet end is provided with a second-section water inlet which is connected with the first-section concentrated water outlet through the water conveying pipe;
the second-section water outlet end is provided with a second-section water outlet and a second-section concentrated water outlet, the second-section water outlet is connected with the water production tank through the water production pipe, and the second-section concentrated water outlet is connected with the concentrated water tank through the water drainage pipe;
The control unit also comprises a water delivery on-line pressure instrument which is arranged on the water delivery pipe and connected with the control module.
4. The reverse osmosis membrane concentration ratio control system of claim 3, wherein the real-time detection value comprises:
the real-time inflow water flow value detected by the inflow water online flowmeter;
The real-time water inlet temperature value detected by the online thermometer; the real-time influent ORP value detected by the influent online ORP instrument;
The real-time inlet water pH value detected by the inlet water online pH meter;
the real-time water inlet pressure value detected by the water inlet on-line pressure instrument;
The real-time inlet water SDI value detected by the online SDI detector;
The real-time concentrated water inlet end pressure value detected by the concentrated water inlet end on-line pressure instrument;
The real-time concentrated water outlet end pressure value detected by the concentrated water outlet end on-line pressure instrument;
the real-time produced water flow value detected by the produced water online flowmeter;
the real-time TDS value of the water production pipe detected by the online TDS meter of the produced water;
The real-time produced water pressure value detected by the produced water online pressure instrument;
the real-time drainage flow value detected by the drainage online flowmeter;
the real-time drainage pressure value detected by the drainage online pressure instrument;
The real-time water delivery pressure value detected by the water delivery on-line pressure instrument;
The method also comprises the steps of real-time desalination rate, real-time recovery rate, membrane treatment unit differential pressure and membrane treatment unit differential pressure of each section;
wherein the real-time desalination rate is the ratio of the difference between the real-time TDS value of the water inlet pipe and the real-time TDS value of the water producing pipe to the real-time TDS value of the water inlet pipe;
The real-time recovery rate is the ratio of the real-time produced water flow value to the real-time inlet water flow value;
the pressure difference of the membrane treatment unit is the difference value between the pressure value of the real-time concentrated water inlet end and the pressure value of the real-time concentrated water outlet end;
the differential pressure of each section of the membrane treatment unit comprises a differential pressure of a first section of reverse osmosis membrane unit and a differential pressure of a second section of reverse osmosis membrane unit; the differential pressure of the reverse osmosis membrane unit is the difference value between the real-time concentrated water inlet end pressure value and the real-time water delivery pressure value; and the differential pressure of the two-stage reverse osmosis membrane unit is the difference value between the real-time water delivery pressure value and the real-time concentrated water outlet end pressure value.
5. The reverse osmosis membrane concentration ratio control system of a power plant according to claim 4, wherein:
The control module performs operation early warning control on the membrane processing unit by comparing the parameter threshold with the drain pipe real-time TDS value, the real-time drainage flow value, the real-time water inflow temperature value, the real-time water inflow ORP value, the real-time water inflow pH value, the real-time water inflow pressure value, the real-time drainage pressure value, the real-time concentrate inlet end pressure value, the real-time concentrate outlet end pressure value, the water production pipe real-time TDS value, the water inlet pipe real-time TDS value, the real-time water production flow value, the real-time water production pressure value, the real-time water inflow SDI value, the real-time desalination rate and the real-time recovery rate;
the control module outputs an alarm signal to the outside when the real-time TDS value of the drain pipe is lower than the lower limit of the parameter threshold;
When the real-time drainage flow value is higher than the real-time water inflow flow value, the control module outputs an alarm signal to the outside;
the control module outputs an alarm signal to the outside when the real-time water inlet temperature value is higher than the upper limit of the parameter threshold value or lower than the lower limit of the parameter threshold value;
the control module outputs an alarm signal or a shutdown signal to the outside when the real-time influent ORP value is higher than the upper limit of the parameter threshold;
the control module outputs an alarm signal to the outside when the pH value of the real-time inflow water is higher than the upper limit of the parameter threshold value or lower than the lower limit of the parameter threshold value;
the control module outputs an alarm signal or a stop signal outwards when the real-time water inlet pressure value is higher than the upper limit of the parameter threshold value;
the control module outputs an alarm signal or a stop signal to the outside when the real-time drainage pressure value is higher than the upper limit of the parameter threshold;
The control module outputs a shutdown signal to the outside when the real-time concentrated water inlet end pressure value is lower than the lower limit of the parameter threshold value and/or when the real-time concentrated water outlet end pressure value is higher than the upper limit of the parameter threshold value;
The control module outputs an alarm signal to the outside when the real-time desalination rate is lower than the lower limit of the parameter threshold;
The real-time recovery rate is higher than the upper limit of the parameter threshold value, and the control module outputs an alarm signal to the outside;
The control module outputs an alarm signal to the outside when the real-time water production pressure value is higher than the upper limit of the parameter threshold;
And the control module outputs an alarm signal to the outside when the SDI value of the real-time water inlet is higher than the upper limit of the parameter threshold.
6. The reverse osmosis membrane concentration ratio control system of a power plant according to claim 4, wherein:
The control module controls the operation risk of the membrane processing unit by comparing the parameter threshold value with the real-time detection value, wherein the operation risk comprises colloid pollution risk, organic matter pollution risk and scaling pollution risk.
7. The reverse osmosis membrane concentration ratio control system of a power plant according to claim 6, wherein:
The control module controls the colloid pollution risk of the membrane processing unit by comparing the parameter threshold with the real-time water inlet pressure value, the real-time water production flow value, the membrane processing unit pressure difference and the real-time desalination rate;
And if the real-time water inlet pressure value rises above the parameter threshold, the real-time water production flow value falls above the parameter threshold, the membrane processing unit differential pressure rises above the parameter threshold, and the real-time desalination rate meets the parameter threshold, the control module judges that colloid pollution occurs and outputs colloid pollution alarm signals to the outside.
8. The reverse osmosis membrane concentration ratio control system of a power plant according to claim 6, wherein:
the control module controls the risk of organic pollution to the membrane processing unit by comparing the parameter threshold with the real-time water production flow value, the real-time water inlet pressure value, the real-time desalination rate and the pressure difference of each section of the membrane processing unit;
and simultaneously, the real-time produced water flow value is reduced to exceed the parameter threshold, the real-time inlet water pressure value is increased to exceed the parameter threshold, the real-time desalination rate meets the parameter threshold, the differential pressure of each section of the membrane processing unit is increased to exceed the parameter threshold, the differential pressure rising amplitude of the one section of reverse osmosis membrane unit is larger than that of the two sections of reverse osmosis membrane unit, and the control module judges that organic pollution occurs and outputs an organic pollution risk alarm signal to the outside.
9. The reverse osmosis membrane concentration ratio control system of a power plant according to claim 6, wherein:
The control module controls the scale pollution risk of the membrane treatment unit by comparing the parameter threshold value with the real-time water inlet pressure value, the real-time water production flow value, the real-time desalination rate and the pressure difference of each section of the membrane treatment unit, wherein the scale pollution risk comprises sulfate scale pollution risk, carbonate scale pollution risk and silicate scale pollution risk;
The control module judges that sulfate scale pollution and/or carbonate scale pollution occur when the differential pressure of the two-stage reverse osmosis membrane unit rises above the parameter threshold value, and outputs a sulfate scale pollution risk and carbonate scale pollution risk alarm signal to the outside;
The control module judges that silicate scale pollution occurs and outputs a silicate scale pollution risk alarm signal to the outside when the real-time water inlet pressure value rises, the real-time water production flow value falls and the real-time desalination rate falls, the differential pressure of the first-stage reverse osmosis membrane unit meets the parameter threshold value, and the differential pressure of the second-stage reverse osmosis membrane unit falls beyond the parameter threshold value.
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