CN115253681A - Operation control method and operation control module of reverse osmosis device - Google Patents
Operation control method and operation control module of reverse osmosis device Download PDFInfo
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- CN115253681A CN115253681A CN202210820797.4A CN202210820797A CN115253681A CN 115253681 A CN115253681 A CN 115253681A CN 202210820797 A CN202210820797 A CN 202210820797A CN 115253681 A CN115253681 A CN 115253681A
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- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 139
- 238000000034 method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000012528 membrane Substances 0.000 claims abstract description 46
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 239000002455 scale inhibitor Substances 0.000 claims abstract description 20
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 abstract description 7
- 230000001276 controlling effect Effects 0.000 description 6
- 230000003204 osmotic effect Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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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
- B01D61/12—Controlling or regulating
-
- 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
-
- 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
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- 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
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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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
- 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
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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)
- Chemical Kinetics & Catalysis (AREA)
- Nanotechnology (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 debugging of a chemical water system of a nuclear power plant, and particularly relates to an operation control method and an operation control module of a reverse osmosis device. The reverse osmosis device for the chemical water system of the nuclear power plant comprises a reverse osmosis unit 3, wherein a scale inhibitor dosing device 4 and a reducing agent dosing device 5 are arranged at the upstream, a water production discharge valve 6 and a concentrated water side discharge valve 7 are arranged at the downstream, and the reverse osmosis device has two operation modes of a constant pressure mode and a constant frequency mode; the operation control method of the reverse osmosis device comprises the following steps: s1, operating a reverse osmosis device for 1 hour in a constant pressure mode, and then switching to a constant frequency mode to operate; s2, reducing the dosing amount of the scale inhibitor dosing device 4 and the reducing agent dosing device 5; and S3, operating the reverse osmosis device in a constant frequency mode for 1 minute, and then switching to operate in a constant pressure mode. The invention improves the automatic operation level of the reverse osmosis device, obviously improves the reverse osmosis operation performance and prolongs the chemical cleaning period of the reverse osmosis membrane.
Description
Technical Field
The invention belongs to the technical field of debugging of a chemical water system of a nuclear power plant, and particularly relates to an operation control method and an operation control module of a reverse osmosis device.
Background
The demineralized water system of the nuclear power plant is used for providing qualified demineralized water for a primary circuit and a secondary circuit of a nuclear power unit, and a reverse osmosis device in the system purifies water through a physical filtration process. Reverse osmosis is a membrane separation technique in which the impurities in the feed water are separated and removed by using the selective permeability of a semipermeable membrane with pressure as a driving force, and pressure is applied to the concentrated solution on one side of the membrane, and when the pressure exceeds the osmotic pressure thereof, the volume can reversely permeate against the natural permeation direction, so that the permeated fresh water is obtained on the low-pressure side of the membrane, and the concentrated water is left on the high-pressure side.
Due to the introduction of impurities into the inlet water of the reverse osmosis device, the membrane elements can be polluted in different degrees, so that the pressure difference between the inlet and the outlet of the system is increased, the water yield is reduced, the desalination rate is reduced, and the normal and efficient operation of the reverse osmosis system is influenced. In the process flow, in order to ensure the safe and stable operation of the reverse osmosis membrane, a certain concentration and dosage of scale inhibitor and reducing agent are added into the inlet water to relieve the scaling blockage and oxidation damage of the reverse osmosis membrane. However, as the operation period is prolonged, the membrane surface is still gradually blocked and scaled, the pressure difference at the membrane end is increased, and the water production flow is reduced. At the moment, chemical cleaning is needed to recover the water permeability of the reverse osmosis membrane, one chemical cleaning is generally needed for 3-6 months, the acid and alkali used in the chemical cleaning causes great pollution to the environment, and the operation cost of a nuclear power plant is increased.
Disclosure of Invention
The method aims to overcome the defects of chemical cleaning of the conventional reverse osmosis device, and the method has the advantages that the high-pressure pump, the scale inhibitor dosing device and the reducing agent dosing device of the reverse osmosis device are controlled in a variable frequency mode, stepless regulation of the pressure of the reverse osmosis device can be realized through frequency control, and the dosing device can be accurately regulated. Energy consumption and dosage are saved.
In order to achieve the purpose, the technical scheme adopted by the invention is an operation control method of a reverse osmosis device, which is used for the reverse osmosis device of a nuclear power plant chemical water system, wherein the reverse osmosis device comprises a reverse osmosis unit, the upstream of the reverse osmosis unit is provided with a scale inhibitor dosing device and a reducing agent dosing device, and the downstream of the reverse osmosis unit is provided with a produced water discharge valve and a concentrated water side discharge valve, and the reverse osmosis device has two operation modes of a constant pressure mode and a constant frequency mode; the operation control method of the reverse osmosis device comprises the following steps:
s1, after the reverse osmosis device operates for 1 hour in the constant pressure mode, the reverse osmosis device is switched to operate in the constant frequency mode;
s2, reducing the dosing amount of the scale inhibitor dosing device and the reducing agent dosing device;
and S3, after the reverse osmosis device runs for 1 minute in the constant frequency mode, the reverse osmosis device is switched to run in the constant pressure mode.
Further, in the present invention,
a first pipeline is arranged at the upstream of the reverse osmosis unit, and a second pipeline and a third pipeline are arranged at the downstream of the reverse osmosis unit;
the reverse osmosis unit consists of a membrane shell and a reverse osmosis membrane arranged in the membrane shell and is used for purifying the water to be treated;
the upstream end of the first pipeline is connected with a water source of water to be treated, and the downstream end of the first pipeline is connected with a reverse osmosis unit;
the second pipeline is used for outputting reverse osmosis produced water and is connected with the produced water discharge valve;
the third pipeline is used for outputting the outlet water of the concentrated water side, and a discharge valve of the concentrated water side is connected to the third pipeline;
an inlet flow meter, a high-pressure pump, an electric valve and a reverse osmosis membrane inlet pressure meter are sequentially arranged on the first pipeline along the upstream direction to the downstream direction, wherein the high-pressure pump is also provided with a high-pressure pump frequency converter;
the scale inhibitor dosing device and the reducing agent dosing device jointly use a metering pump frequency converter, and the output ends of the scale inhibitor dosing device and the reducing agent dosing device are connected to the first pipeline between the inlet flow meter and the high-pressure pump.
Further, in the step S1, when the reverse osmosis apparatus operates in the constant pressure mode, the high-pressure pump needs to be kept in stable operation, and a value of the pressure gauge at the inlet of the reverse osmosis membrane is consistent with a first set value; the first set value is a value recorded by an operator in advance and set according to the water yield requirement of the reverse osmosis device, and the range of the pressure value is 0.9MPa-1.4 MPa.
Further, the step 2 comprises the following steps:
s2.1, the high-pressure pump frequency converter gradually reduces the operation frequency according to a fixed speed, so that the outlet pressure of the high-pressure pump is gradually reduced, and the numerical value of the reverse osmosis membrane inlet pressure gauge is gradually reduced until the high-pressure pump frequency converter is reduced to a second set value; the step-by-step reduction of the operating frequency at a fixed rate means that the operating frequency is reduced step by step at a fixed speed, specifically, the operating frequency of the high-pressure pump frequency converter is reduced at a speed of 0.5 hertz per second; the second set value is a value recorded in advance by an operator and is 21HZ;
step S2.2, when the value of the inlet flow meter is 160m3The/h is gradually reduced to 90m3When the speed of the frequency converter of the metering pump is lowered to 32% from 90% of the full speed value;
step S2.3, opening the produced water discharge valve;
step S2.4, opening the discharge valve at the concentrated water side;
s2.5, gradually reducing the electric valve to a third set value to enable the inlet flow meter to reach a fourth set value; at the moment, the reverse osmosis device enters the fixed frequency mode to operate; the third set value is 20% of the opening degree of the electric valve; the fourth setting value is 60m3/h。
Further, the step 3 comprises the following steps:
step S3.1, after the reverse osmosis device runs for 1 minute in the constant frequency mode, closing the discharge valve at the concentrated water side;
step S3.2, closing the water production discharge valve;
step S3.3, gradually opening the electric valve to enable the opening degree of the electric valve to be opened from the third set value to 100 percent;
s3.4, gradually increasing the operating frequency of the high-pressure pump frequency converter at a fixed speed until the value of the reverse osmosis membrane inlet pressure gauge is consistent with the first set value; the step-by-step increase of the operating frequency at a fixed speed means that the operating frequency is increased step by step at a fixed speed, and specifically, the operating frequency of the high-pressure pump frequency converter is increased at a speed of 0.5 hertz per second;
step S3.5, when the value of the inlet flow meter is 90m3Step by step,/h was increased to 160m3At/h, the speed of the frequency converter of the metering pump is increased from 32% of the full speed value to 90%.
Further, the step S1, the step S2 and the step S3 are implemented by a PLC program controlling the reverse osmosis device to operate.
The invention also provides an operation control module of the reverse osmosis device, which is used for the operation control method of the reverse osmosis device, wherein the operation control module is arranged in a PLC program for controlling the operation of the reverse osmosis device and comprises a conversion module and a frequency modulation module;
the conversion module is used for controlling the PLC program to switch the reverse osmosis device into the constant pressure mode or the constant frequency mode, enabling the high-pressure pump to keep stable operation and keeping the numerical value of the reverse osmosis membrane inlet pressure gauge consistent with the first set value;
the frequency modulation module is configured to receive an instruction of the conversion module to control the PLC program to implement the step S2.1, the step S2.2, the step S2.3, the step S2.4, the step S2.5, the step S3.1, the step S3.2, the step S3.3, the step S3.4, and the step S3.5.
The invention has the beneficial effects that:
1. the reverse osmosis device operates in a dual mode, can realize regular low-pressure high-flow flushing of the concentrated water side, can effectively relieve the pollution of the osmotic membrane, and prolongs the chemical cleaning period of the osmotic membrane. The cleaning time can be prolonged from 3 months to 6-9 months, so that the reverse osmosis device can operate more durably, safely, stably and economically. The running cost of the reverse osmosis device is reduced, and the usage amount of acid and alkali additives in the environment is reduced.
2. The high-pressure pump 1 adjusts the outlet pressure according to a fixed speed, and the integral operation stability of the reverse osmosis device can be effectively improved. The dosing device is controlled in a variable frequency mode, the dosing amount is adjusted in real time according to the flow of the inlet of the reverse osmosis membrane, and accurate adjustment of the dosing amount is achieved.
Drawings
FIG. 1 is a schematic diagram of a reverse osmosis apparatus according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of controlling the operation of a reverse osmosis unit according to an embodiment of the present invention;
in the figure: 1-a high-pressure pump, 2-an electric valve, 3-a reverse osmosis unit, 4-a scale inhibitor dosing device, 5-a reducing agent dosing device, 6-a water production discharge valve, 7-a concentrated water side discharge valve, 8-a metering pump frequency converter, 9-a high-pressure pump frequency converter, 10-an inlet flowmeter, 11-a reverse osmosis membrane inlet pressure gauge, 12-a first pipeline, 13-a second pipeline and 14-a third pipeline.
Detailed Description
The invention is further described below with reference to the figures and examples.
The invention provides an operation control method of a reverse osmosis device (see figure 2), which is used for the reverse osmosis device (see figure 1) of a chemical water system of a nuclear power plant, wherein the reverse osmosis device comprises a reverse osmosis unit 3, wherein a scale inhibitor dosing device 4 and a reducing agent dosing device 5 are arranged at the upstream, and a produced water discharge valve 6 and a concentrated water side discharge valve 7 are arranged at the downstream;
a first pipeline 12 is arranged at the upstream of the reverse osmosis unit 3, and a second pipeline 13 and a third pipeline 14 are arranged at the downstream of the reverse osmosis unit 3;
the reverse osmosis unit 3 consists of a membrane shell and a reverse osmosis membrane arranged in the membrane shell and is used for purifying the water to be treated;
the upstream end of the first pipeline 12 is connected with a water source of water to be treated, and the downstream end of the first pipeline 12 is connected with the reverse osmosis unit 3;
the second pipeline 13 is used for outputting reverse osmosis produced water, and the second pipeline 13 is connected with a produced water discharge valve 6;
the third pipeline 14 is used for outputting the outlet water at the concentrated water side, and the third pipeline 14 is connected with a discharge valve 7 at the concentrated water side;
an inlet flow meter 10, a high-pressure pump 1, an electric valve 2 and a reverse osmosis membrane inlet pressure gauge 11 are sequentially arranged on a first pipeline 12 along the upstream direction to the downstream direction, wherein the high-pressure pump 1 is also provided with a high-pressure pump frequency converter 9;
the scale inhibitor dosing device 4 and the reducing agent dosing device 5 jointly use a metering pump frequency converter 8, and the output ends of the scale inhibitor dosing device 4 and the reducing agent dosing device 5 are connected to a first pipeline 12 between the inlet flowmeter 10 and the high-pressure pump 1.
The reverse osmosis device has two operation modes of a constant pressure mode and a constant frequency mode;
under the level pressure mode, high-pressure pump 1 is according to the setting pressure operation, guarantees that reverse osmosis unit inlet pressure is under the setting pressure all the time, for reverse osmosis membrane provides stable pressure environment of intaking, provides the prerequisite for reverse osmosis membrane lasts, stable, high-efficient operation. When the pressure of the upstream water source fluctuates, the overall operation of the reverse osmosis device is not influenced. Under the constant pressure mode, the reverse osmosis device operates according to the designed pressure and flow.
In the constant frequency mode of operation, the high pressure pump operates at a fixed frequency.
The operation control method of the reverse osmosis device comprises the following steps (the reverse osmosis device runs stably under the water making working condition):
s1, after the reverse osmosis device operates for 1 hour in a constant pressure mode, the reverse osmosis device is switched to operate in a constant frequency mode;
s2, reducing the dosing amount of the scale inhibitor dosing device 4 and the reducing agent dosing device 5;
and S3, after the reverse osmosis device runs for 1 minute in the constant frequency mode, the reverse osmosis device is switched to run in the constant pressure mode.
In the step S1, when the reverse osmosis device operates in a constant pressure mode, the high-pressure pump 1 needs to keep stable operation, and the numerical value of a reverse osmosis membrane inlet pressure gauge 11 is consistent with a first set value; the first set value is a value recorded by an operator in advance and set according to the water yield requirement of the reverse osmosis device, and the range of the pressure value is between 0.9MPa and 1.4 MPa.
The step 2 comprises the following steps:
s2.1, the high-pressure pump frequency converter 9 gradually reduces the operation frequency according to a fixed speed, so that the outlet pressure of the high-pressure pump 1 is gradually reduced, and the numerical value of a reverse osmosis membrane inlet pressure gauge 11 is gradually reduced until the high-pressure pump frequency converter 9 is reduced to a second set value; the step-by-step reduction of the operating frequency at a fixed rate means that the operating frequency is reduced step by step at a fixed speed, specifically, the operating frequency of the high-pressure pump frequency converter 9 is reduced at a speed of 0.5 hertz (0.5 HZ/s) per second; the second set value is a value recorded in advance by an operator, and is generally 21HZ;
step S2.2, when the value of the inlet flow meter 10 is from 160m3The/h is gradually reduced to 90m3When the dosage is/h, the speed of the frequency converter 8 of the metering pump is reduced to 32 percent from 90 percent of the full speed value (namely, the dosage is reduced from the scale inhibitor dosing device 4 and the reducing agent dosing device 5);
step S2.3, opening a produced water discharge valve 6;
step S2.4, opening a concentrated water side discharge valve 7;
step S2.5, gradually reducing the electric valve 2 to a third set value to enable the inlet flow meter 10 to reach a fourth set value; at the moment, the reverse osmosis device enters a constant frequency mode to operate; the third set value is 20% of the opening of the electric valve 2; the fourth setting value is 60m3/h。
The step 3 comprises the following steps:
step S3.1, after the reverse osmosis device runs for 1 minute in a constant frequency mode, closing a discharge valve 7 at a concentrated water side;
s3.2, closing the produced water discharge valve 6;
step S3.3, gradually opening the electric valve 2 to ensure that the opening degree of the electric valve 2 is opened from a third set value to 100 percent;
s3.4, gradually increasing the operating frequency of the high-pressure pump frequency converter 9 at a fixed speed until the value of the reverse osmosis membrane inlet pressure gauge 11 is consistent with a first set value; the step-by-step increase of the operating frequency at a fixed rate means that the operating frequency is increased step by step at a fixed speed, specifically, the operating frequency of the high-pressure pump frequency converter 9 is increased at a speed of 0.5 hertz (0.5 HZ/s) per second;
and step S3.5, when the value of the inlet flow meter 10 is gradually increased from 90m3/h to 160m3/h, the speed of the metering pump frequency converter 8 is increased from 32% of the full speed value to 90% (namely the scale inhibitor dosing device 4 and the reducing agent dosing device 5 start to increase the dosing amount).
The frequency of the high-pressure pump 1 is changed at a fixed rate, and the system start, system stop, protection stop, etc. are all performed at the same rate.
The dosing pumps of the scale inhibitor dosing device 4 and the reducing agent dosing device 5 are also controlled by frequency conversion (a metering pump frequency converter 8), and the output of the dosing pumps is interlocked with the inlet flow of the reverse osmosis membrane. When the reverse osmosis inlet amount is increased, the medicine adding amount is increased along with the increase of the reverse osmosis inlet amount; when the reverse osmosis inlet flow is reduced, the dosage is reduced.
When the device operates in a fixed frequency operation mode, the opening degree of an electric valve 2 at the inlet of the reverse osmosis membrane needs to be adjusted, so that the reverse osmosis membrane is prevented from falling off due to overhigh membrane surface flow velocity and the performance of the reverse osmosis membrane is prevented from being influenced.
The invention also provides an operation control module of the reverse osmosis device, which is used in the operation control method of the reverse osmosis device, wherein the operation control module is arranged in a PLC program for controlling the operation of the reverse osmosis device and comprises a conversion module and a frequency modulation module;
the conversion module is used for controlling the PLC program to switch the reverse osmosis device into a constant pressure mode or a constant frequency mode, keeping the high-pressure pump 1 in stable operation, and keeping the numerical value of a reverse osmosis membrane inlet pressure gauge 11 consistent with a first set value;
the frequency modulation module is used for receiving the instruction of the conversion module to control the PLC program to realize step S2.1, step S2.2, step S2.3, step S2.4, step S2.5, step S3.1, step S3.2, step S3.3, step S3.4 and step S3.5.
The device according to the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and also belong to the technical innovation scope of the present invention.
Claims (6)
1. The operation control method of the reverse osmosis device is used for the reverse osmosis device of a chemical water system of a nuclear power plant, the reverse osmosis device comprises a reverse osmosis unit (3) with an upstream provided with a scale inhibitor dosing device (4) and a reducing agent dosing device (5) and a downstream provided with a water production discharge valve (6) and a concentrated water side discharge valve (7), and the reverse osmosis device has two operation modes of a constant pressure mode and a constant frequency mode; the operation control method of the reverse osmosis device comprises the following steps:
s1, after the reverse osmosis device operates for 1 hour in the constant pressure mode, the reverse osmosis device is switched to operate in the constant frequency mode;
s2, reducing the dosing amount of the scale inhibitor dosing device (4) and the reducing agent dosing device (5);
and S3, after the reverse osmosis device runs for 1 minute in the constant frequency mode, the reverse osmosis device is switched to run in the constant pressure mode.
2. A method of controlling the operation of a reverse osmosis apparatus according to claim 1, wherein:
a first pipeline (12) is arranged at the upstream of the reverse osmosis unit (3), and a second pipeline (13) and a third pipeline (14) are arranged at the downstream of the reverse osmosis unit (3);
the reverse osmosis unit (3) consists of a membrane shell and a reverse osmosis membrane arranged in the membrane shell and is used for purifying the water to be treated;
the upstream end of the first pipeline (12) is connected with a water source of water to be treated, and the downstream end of the first pipeline (12) is connected with a reverse osmosis unit (3);
the second pipeline (13) is used for outputting reverse osmosis produced water, and the second pipeline (13) is connected with the produced water discharge valve (6);
the third pipeline (14) is used for outputting outlet water at the concentrated water side, and the third pipeline (14) is connected with a discharge valve (7) at the concentrated water side;
an inlet flow meter (10), a high-pressure pump (1), an electric valve (2) and a reverse osmosis membrane inlet pressure gauge (11) are sequentially arranged on the first pipeline (12) along the upstream direction to the downstream direction, wherein the high-pressure pump (1) is also provided with a high-pressure pump frequency converter (9);
the scale inhibitor dosing device (4) and the reducing agent dosing device (5) jointly use a metering pump frequency converter (8), and the output ends of the scale inhibitor dosing device (4) and the reducing agent dosing device (5) are connected to the first pipeline (12) between the inlet flowmeter (10) and the high-pressure pump (1).
3. A method of controlling the operation of a reverse osmosis apparatus according to claim 2, wherein: in the step S1, when the reverse osmosis device operates in the constant pressure mode, the high-pressure pump (1) needs to keep stable operation, and the value of the reverse osmosis membrane inlet pressure gauge (11) is consistent with a first set value; the first set value is a value which is input by an operator in advance and is set according to the water yield requirement of the reverse osmosis device, and the range of the pressure value is between 0.9MPa and 1.4 MPa.
4. A method of controlling the operation of a reverse osmosis apparatus according to claim 3, wherein said step 2 comprises the steps of:
s2.1, gradually reducing the operating frequency of the high-pressure pump frequency converter (9) at a fixed speed, so that the outlet pressure of the high-pressure pump (1) is gradually reduced, and the numerical value of the reverse osmosis membrane inlet pressure gauge (11) is gradually reduced until the high-pressure pump frequency converter (9) is reduced to a second set value; the step-by-step reduction of the operating frequency at a fixed speed means that the operating frequency is reduced step by step at a fixed speed, and specifically, the operating frequency of the high-pressure pump frequency converter (9) is reduced at a speed of 0.5 hertz per second; the second set value is a value recorded in advance by an operator and is 21HZ;
step S2.2, when the value of the inlet flow meter (10) is 160m3The/h is gradually reduced to 90m3At the time of/h, the speed of the metering pump frequency converter (8) is reduced to 32% from 90% of the full speed value;
step S2.3, opening the water production discharge valve (6);
step S2.4, opening the discharge valve (7) at the concentrated water side;
s2.5, gradually reducing the electric valve (2) to a third set value to enable the inlet flow meter (10) to reach a fourth set value; at the moment, the reverse osmosis device enters the fixed frequency mode to operate; the third set value is 20% of the opening degree of the electric valve (2); the fourth setting value is 60m3/h。
5. The method of controlling the operation of a reverse osmosis apparatus according to claim 4, wherein the step 3 comprises the steps of:
step S3.1, after the reverse osmosis device is operated for 1 minute in the fixed frequency mode, closing the discharge valve (7) on the concentrated water side;
step S3.2, closing the water-producing discharge valve (6);
step S3.3, gradually opening the electric valve (2) to enable the opening degree of the electric valve (2) to be opened from the third set value to 100 percent;
s3.4, gradually increasing the operating frequency of the high-pressure pump frequency converter (9) at a fixed speed until the numerical value of the reverse osmosis membrane inlet pressure gauge (11) is consistent with the first set value; the step-by-step increase of the operating frequency at a fixed speed means that the operating frequency is increased step by step at a fixed speed, and specifically, the operating frequency of the high-pressure pump frequency converter (9) is increased at a speed of 0.5Hz per second;
step S3.5, when the value of the inlet flow meter (10) is 90m3Step by step,/hUp to 160m3At/h, the speed of the metering pump frequency converter (8) is increased from 32% of the full speed value to 90%.
6. An operation control module of a reverse osmosis apparatus used for the operation control method of the reverse osmosis apparatus according to claim 5, characterized in that:
the operation control module is arranged in a PLC program for controlling the reverse osmosis device to operate and comprises a conversion module and a frequency modulation module;
the conversion module is used for controlling the PLC program to switch the reverse osmosis device into the constant pressure mode or the constant frequency mode, enabling the high-pressure pump (1) to keep stable operation and keeping the numerical value of the reverse osmosis membrane inlet pressure gauge (11) consistent with the first set value;
the frequency modulation module is configured to receive an instruction of the conversion module to control the PLC program to implement the step S2.1, the step S2.2, the step S2.3, the step S2.4, the step S2.5, the step S3.1, the step S3.2, the step S3.3, the step S3.4, and the step S3.5.
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