CN211825912U - Reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation system - Google Patents
Reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation system Download PDFInfo
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- CN211825912U CN211825912U CN201922444106.1U CN201922444106U CN211825912U CN 211825912 U CN211825912 U CN 211825912U CN 201922444106 U CN201922444106 U CN 201922444106U CN 211825912 U CN211825912 U CN 211825912U
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- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 126
- 239000013535 sea water Substances 0.000 title claims abstract description 103
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 59
- 239000002455 scale inhibitor Substances 0.000 title claims abstract description 49
- 238000011156 evaluation Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 284
- 238000012360 testing method Methods 0.000 claims abstract description 169
- 239000012528 membrane Substances 0.000 claims abstract description 86
- 239000007788 liquid Substances 0.000 claims abstract description 69
- 230000000149 penetrating effect Effects 0.000 claims abstract description 15
- 239000003814 drug Substances 0.000 claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 16
- 238000005485 electric heating Methods 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 10
- 239000012466 permeate Substances 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 239000000243 solution Substances 0.000 description 13
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 10
- 229910001424 calcium ion Inorganic materials 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 7
- 230000005764 inhibitory process Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000000429 assembly Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
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- 238000002360 preparation method Methods 0.000 description 2
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- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012527 feed solution Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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Abstract
The utility model discloses a reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation system, which comprises a test system, wherein the test system comprises dosing equipment, a test water tank, a water inlet pump, a security filter, a high-pressure pump and a reverse osmosis membrane component; the output port of the dosing equipment is communicated with the medicine inlet of the test water tank; the test water tank, the water inlet pump, the cartridge filter, the high-pressure pump and the reverse osmosis membrane module are sequentially connected to form a liquid circulation loop, wherein a concentrated solution outlet and a penetrating solution outlet of the reverse osmosis membrane module are respectively connected with an input port of the test water tank. The utility model discloses the operating condition of simulation reverse osmosis seawater desalination realizes quick, simple completion to the seawater desalination dynamic test that hinders dirty medicament.
Description
Technical Field
The utility model relates to a water treatment antisludging agent dynamic behavior evaluation device, in particular to reverse osmosis sea water desalination antisludging agent dynamic behavior evaluation system.
Background
At present, the seawater desalination industry in China is in a rapid development stage, and the severe water shortage situation will promote the further development of the seawater desalination industry. 136 seawater desalination projects are built up in China by 2017, the project scale is 1189105 tons/day, the maximum seawater desalination project scale reaches 20 ten thousand tons/day, and the desalinated water is widely applied to high-consumption water industries such as coastal electric power, petrifaction and steel, and the like and sea islands for producing domestic water. According to the set target of the opinion on the accelerated development of the seawater desalination industry in the office of the State Council, the total scale of the seawater desalination in China in recent years reaches 220 ten thousand to 260 million cubic meters per day. At present, the low-temperature multi-effect and reverse osmosis account for more than 99 percent of the market share of the seawater desalination in China, and are the mainstream seawater desalination technology in China. In the reverse osmosis seawater desalination operation process, a large amount of dirt such as calcium carbonate, calcium sulfate, barium sulfate, suspended matters and the like are deposited on the surface of the membrane, and the dirt can damage membrane elements to cause the reduction of the desalination water amount, so that a scale inhibitor must be added into a reverse osmosis membrane seawater desalination system. In the coming decade, the seawater desalination industry will develop at a faster rate, and the desalinated water treatment agent has huge potential market demand and wide market prospect.
However, at present, no unified evaluation method for dynamic performance of reverse osmosis seawater desalination scale inhibitors exists in China, and the performance evaluation of the seawater desalination scale inhibitors generally refers to a circulating water scale inhibitor evaluation method GB/T16632 calcium carbonate deposition method for measuring scale inhibition performance of a water treatment agent and an HY/T198-2015 artificial concentrated seawater calcium carbonate deposition method for measuring scale inhibition performance of scale inhibitors for seawater desalination membranes, which are mainly laboratory static test methods, wherein the difference between the measurement conditions and the working conditions of a seawater desalination system is large. Therefore, the existing device and method for evaluating the performance of the reverse osmosis scale inhibitor are difficult to objectively reflect the scale inhibition performance of the scale inhibitor in a seawater desalination system, bring difficulty to desalination medicaments for domestic seawater desalination enterprises, and increase the dependence of the domestic seawater desalination enterprises on medicaments supplied by foreign manufacturers.
Disclosure of Invention
The utility model provides a rapid, simple and effective evaluation system for dynamic performance of reverse osmosis seawater desalination scale inhibitor for solving the technical problems in the prior art.
The utility model discloses a solve the technical scheme that technical problem that exists among the well-known technique took and be: a reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation system comprises a test system, wherein the test system comprises dosing equipment, a test water tank, a water inlet pump, a cartridge filter, a high-pressure pump and a reverse osmosis membrane component; the output port of the dosing equipment is communicated with the medicine inlet of the test water tank; the test water tank, the water inlet pump, the cartridge filter, the high-pressure pump and the reverse osmosis membrane module are sequentially connected to form a liquid circulation loop, wherein a concentrated solution outlet and a penetrating solution outlet of the reverse osmosis membrane module are respectively connected with an input port of the test water tank.
Further, the test system also comprises a raw water tank and a raw water pump; the raw water tank, the raw water pump and the test water tank are sequentially connected; the raw water tank stores seawater which is not desalted, and the seawater in the raw water tank is conveyed into the test water tank through the raw water pump.
Furthermore, the test system also comprises a temperature control heater, wherein the temperature control heater comprises an electric heating rod, a temperature sensor and a temperature controller, and the electric heating rod is arranged in the test water tank and is used for heating liquid in the test water tank; the temperature sensor is used for measuring the temperature of liquid in the test water tank; the temperature controller receives signals from the temperature sensor and outputs signals to control the electric heating rod to work.
Further, a heat exchanger is arranged in the test water tank.
Further, the test water tank is provided with an upper cover, and a stirrer for stirring liquid in the test water tank is installed on the upper cover.
Further, a pipeline mixer is arranged between the water inlet pump and the cartridge filter.
Furthermore, a backflow pipeline is arranged between the water outlet and the water inlet of the water inlet pump.
Further, the bottom of the test water tank is provided with a vent pipe.
Further, the reverse osmosis membrane subassembly includes a plurality of parallel reverse osmosis membrane units, every the independent switching of reverse osmosis membrane unit, every the inlet, the concentrate delivery outlet, the penetrant delivery outlet of reverse osmosis membrane unit all are connected with the sampling pipe.
Further, the system also comprises an online monitoring system; the online monitoring system comprises a conductivity measuring instrument, a temperature measuring instrument, a liquid level measuring instrument, a pressure measuring instrument and a flow measuring instrument; the detection parts of the conductivity measuring instrument are respectively arranged in the test water tank, the output port of the cartridge filter and the permeate output port of the reverse osmosis membrane module; the detection parts of the temperature measuring instrument are respectively arranged in the test water tank and the input port of the reverse osmosis membrane component; the detection part of the liquid level measuring instrument is arranged in the test water tank; the detection parts of the pressure measuring instruments are respectively arranged at the output port of the raw water pump, the output port of the water inlet pump, the output port of the high-pressure pump and the concentrated solution output port of the reverse osmosis membrane module; and the detection part of the flow measuring instrument is respectively arranged at the input port of the test water tank, the input port of the high-pressure pump and the penetrating fluid output port of the reverse osmosis membrane module.
The utility model has the advantages and positive effects that:
the utility model discloses a reverse osmosis sea water desalination antisludging agent dynamic behavior evaluation system can restore reverse osmosis sea water desalination water treatment agent operating condition to can test antisludging agent dynamic behavior under this condition, improve the accuracy of reverse osmosis sea water desalination water treatment agent field medicament performance evaluation.
It is usable the utility model discloses realize reverse osmosis sea water desalination antisludging agent dynamic behavior evaluation, through the operating condition of simulation reverse osmosis sea water desalination, the concentrated water that produces the reverse osmosis membrane subassembly circulates to experimental water tank entirely, and will desalinate periodically partly or in the whole backward flow to experimental water tank, make the circulating liquid cycle concentrated, thereby increase the scale deposit trend, make quick performance antisludging effect, thereby realize quick, simply accomplish the dynamic test to sea water desalination antisludging agent, realize the antisludging agent dynamic behavior evaluation that is closest to true operating mode. The method for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor is quick, simple and effective.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic view of the working principle of the present invention;
FIG. 3 is a schematic structural view of the temperature-controlled heater of the present invention;
FIG. 4 is a graph showing the concentration factor of calcium ions and chloride ions as a function of cycle number.
In the figure: 1. a raw water tank; 2. a raw water pump; 3. a test water tank; 4. a temperature controlled heater; 5. a water inlet pump; 6. a pipeline mixer; 7. a cartridge filter; 8. dosing equipment; 9. a high pressure pump; 10. a reverse osmosis membrane component.
a. Pretreated seawater;
a pressure measuring instrument;
a flow meter;
a liquid level gauge;
a conductivity measuring instrument;
a temperature measuring instrument;
a pH measuring instrument.
Detailed Description
For further understanding of the contents, features and effects of the present invention, the following embodiments are listed and will be described in detail with reference to the accompanying drawings:
referring to fig. 1 and 2, the dynamic performance evaluation system for reverse osmosis seawater desalination scale inhibitor comprises a test system, wherein the test system comprises a dosing device 8, a test water tank 3, a water inlet pump 5, a cartridge filter 7, a high-pressure pump 9 and a reverse osmosis membrane assembly 10; the output port of the dosing device 8 is communicated with the medicine inlet of the test water tank 3; the test water tank 3, the water inlet pump 5, the cartridge filter 7, the high-pressure pump 9 and the reverse osmosis membrane assembly 10 are sequentially connected to form a liquid circulation loop, wherein a concentrated liquid outlet and a penetrating liquid outlet of the reverse osmosis membrane assembly 10 are respectively connected with an input port of the test water tank 3; namely: the output port of the test water tank 3 is communicated with the input port of the water inlet pump 5; the output port of the water inlet pump 5 is communicated with the input port of the cartridge filter 7; the output port of the cartridge filter 7 is communicated with the input port of the high-pressure pump 9; the output port of the high-pressure pump 9 is communicated with the liquid inlet of the reverse osmosis membrane assembly 10, and two output ports of the reverse osmosis membrane assembly 10 are respectively connected with the input port of the test water tank 3. One or more input ports of the test water tank 3 may be provided.
Reverse osmosis, also known as reverse osmosis, is a membrane separation operation that uses a pressure differential as a driving force to separate a solvent from a solution. The feed solution on one side of the membrane is pressurized and when the pressure exceeds its osmotic pressure, the solvent will reverse osmosis against the direction of natural osmosis. Thereby obtaining a permeated solvent, i.e., permeate, at the low pressure side of the membrane; the high pressure side yields a concentrated solution, i.e., a concentrate. In the technical scheme of the utility model, the penetrating fluid is also called as desalinated water; the concentrated solution is also called concentrated seawater.
Referring to fig. 3, the testing system may further include a temperature-controlled heater 4, where the temperature-controlled heater 4 may include an electric heating rod, a temperature sensor and a temperature controller, and the electric heating rod is disposed in the testing water tank 3 and heats liquid therein; the temperature sensor is used for measuring the temperature of the liquid in the test water tank 3; the temperature controller receives signals from the temperature sensor and outputs signals to control the work of the electric heating rods, such as controlling the on-off of the electric heating rods and a power supply and controlling the number of the electric heating rods connected with the power supply when a plurality of electric heating rods are arranged. The temperature control heater 4, the temperature controller, the electric heating rod and the temperature sensor can adopt applicable products in the prior art.
The test water tank 3 can also be internally provided with a heat exchanger, and the temperature of the liquid in the test water tank 3 can be controlled in a heat exchange mode. The heat exchanger can be internally provided with a heating pipe for heating a heat exchange medium in the heat exchanger.
And the security filter 7 is used for further filtering the tested liquid, so that the measurement result is more accurate.
On one hand, the test water tank 3 can adjust the water inlet amount of the system, so that the water inlet pump 5 runs stably; on the other hand, the reverse osmosis concentrated seawater or the desalted water generated by the reverse osmosis membrane module 10 is input to play a role in adjusting the quality of the liquid in the test water tank 3, so that the pretreated seawater and the concentrated seawater are mixed according to a certain proportion and then are output from the test water tank 3 to become test inlet water of the reverse osmosis membrane module 10. Meanwhile, a heat exchanger or a heater and the like can be arranged in the test water tank 3, and heat exchange or heating can be carried out on the liquid in the test water tank 3 so as to adjust and control the temperature of the liquid in the test water tank 3.
The test inlet water is mixed with the seawater desalination scale inhibitor in the dosing device 8 in the test water tank 3 and is conveyed to the cartridge filter 7 by the inlet pump 5. The cartridge filter 7 further filters the seawater for the test, and the filtering precision can be controlled to be less than 5 um. The high pressure pump 9 is responsible for delivering test seawater from the cartridge filter 7 to the reverse osmosis membrane module 10 and providing the water pressure required for the reverse osmosis process. The test influent water is treated by the reverse osmosis membrane module 10 to produce desalinated water and concentrated seawater.
A sampling tube can be arranged at the input and output port of the reverse osmosis membrane component 10, so that the water quality of the system can be conveniently detected offline.
The reverse osmosis membrane module 10 may be assembled using reverse osmosis membrane unit products of the prior art, and the reverse osmosis membrane units may be connected in series and in parallel.
The reverse osmosis membrane module 10 may include a plurality of parallel reverse osmosis membrane units, each of which is individually openable and closable, and a liquid inlet, a concentrated solution outlet and a permeate outlet of each of which are connected to sampling pipes. The reverse osmosis membrane assemblies 10 are connected in parallel, the operation mode can be changed, a plurality of reverse osmosis membrane units can be operated in parallel when the reverse osmosis membrane assemblies work normally, and 1, 2 or N reverse osmosis membrane units can be operated when needed. Simultaneously, the liquid inlet, the concentrated solution outlet and the penetrating fluid outlet of each reverse osmosis membrane unit are connected with sampling pipes, so that the water quality of the system can be conveniently detected offline. The test water tank 3 can be provided with an upper cover, and a stirrer for stirring the liquid in the test water tank 3 can be installed on the upper cover. The blender can be used to mix seawater and scale inhibitor. The upper cover of the test water tank can also be provided with a medicine inlet for medicine feeding, an input port for water feeding and the like. The side wall of the test water tank 3 can be provided with a communicating pipe liquid level meter, an output port communicated with a water pump, an overflow port and the like; the bottom can be provided with a blow-down pipe. The optional electric mixer of mixer, electric mixer power should guarantee that the intaking in the normal fluctuation range homoenergetic messenger water tank of water level obtains intensive mixing.
A line mixer 6 may be provided between the feed pump 5 and the cartridge filter 7. A pipeline mixer 6 is arranged between the intake pump 5 and the cartridge filter 7 and can be used for fully mixing seawater and the scale inhibitor.
And the bottom of the test water tank 3 can be provided with a vent pipe. The water consumption for the experiment can be conveniently adjusted. And the liquid in the test water tank 3 can be emptied after each test, so that tests of different test liquids are facilitated.
Preferably, a backflow pipeline can be arranged between the water outlet and the water inlet of the water inlet pump 5. A return pipeline can also be arranged between the water outlet and the water inlet of the high-pressure pump 9. The backflow pipeline is used for adjusting the water outlet quantity of the water pump of the system and simultaneously avoiding causing overhigh pressure of the water pump.
The test system also comprises a raw water tank 1 and a raw water pump 2; the raw water tank 1, the raw water pump 2 and the test water tank 3 can be connected in sequence; the raw water tank 1 can store seawater without desalination treatment, and the seawater in the raw water tank 1 is conveyed into the test water tank 3 through the raw water pump 2. Sea water can be stored in former water tank 1 after preliminary filtration silt etc. preliminary treatment, can carry the sea water that is used for the experiment to experimental water tank 3 from former water tank 1 in via former water pump 2 during the experiment. The raw water tank 1 can be provided with an overflow pipe, an emptying pipe, an exhaust pipe and a maintenance manhole.
Preferably, an online monitoring system can be further included; the on-line monitoring system may include a conductivity meter
Temperature measuring instrument
Liquid level measuring instrument
Pressure measuring instrument
Flow meter
And a pH measuring instrument
The conductivity measuring instrument
The detection parts of the reverse osmosis membrane module 10 can be respectively arranged in the test water tank 3, the output port of the security filter 7 and the permeate output port of the reverse osmosis membrane module 10; the temperature measurementInstrument and meter
The detection parts of the reverse osmosis membrane module 10 can be respectively arranged in the test water tank 3 and at the input port of the reverse osmosis membrane module; the liquid level measuring instrument
The detecting part of (2) may be provided in the test water tank 3; the pressure measuring instrument
The detection parts of the reverse osmosis membrane module 10 can be respectively arranged at an output port of the raw water pump 2, an output port of the water inlet pump 5, an output port of the high-pressure pump 9 and a concentrated solution output port of the reverse osmosis membrane module 10; the flow meter
The detection parts of the reverse osmosis membrane module can be respectively arranged at an input port of the test water tank 3, an input port of the high-pressure pump 9 and a penetrating fluid output port of the reverse osmosis membrane module; PH measuring instrument
May be provided in the test water tank 3.
A temperature measuring instrument can be arranged in the test water tank 3
The temperature measuring instrument
The water tank temperature monitoring and programming device has the functions of monitoring and programming, can monitor the heating temperature of inlet water in the water tank, and can give an alarm by the system if the temperature of liquid in the water tank exceeds a set temperature high value.
And a conductivity meter is arranged to mainly monitor the change of the salinity of the pretreated seawater and make reference for test preparation.
The liquid level meter is mainly arranged for controlling the volume of the test water entering the test water tank 3, such as controlling the starting and stopping of the raw water pump and providing reference for water quantity regulation of the test water tank 3.
The outlet of the dosing device 8 is provided with a flowmeter, namely a flow meter
Used for monitoring the dosing flow. Meanwhile, the dosing flow of the dosing device 8 can be linked with the flow of the seawater injected into the test water tank 3, and the dosing flow is adjusted according to the inflow of the pretreated seawater.
The pressure measuring instrument
The water outlet pressure of the water inlet pump and the water outlet pressure of the high-pressure pump can be detected.
The utility model also provides an adopt above-mentioned reverse osmosis sea water desalination antisludging agent dynamic behavior evaluation system's reverse osmosis sea water desalination antisludging agent dynamic behavior evaluation method embodiment, this method is: injecting the pretreated seawater into a test water tank 3, conveying the scale inhibitor into the test water tank 3 by a dosing device 8, and mixing the scale inhibitor with liquid in the test water tank; the mixed liquid is conveyed into a cartridge filter 7 by a water inlet pump 5 for filtering, and the filtered liquid is conveyed to a reverse osmosis membrane component 10 by a high-pressure pump 9; the concentrated water generated by the reverse osmosis membrane component 10 flows back to the test water tank 3 and forms water circulation; in the water circulation process, the concentrations of chloride ions and calcium ions of the liquid in the test water tank 3 are periodically detected; and synchronously draining at least a part of the desalted water generated by the reverse osmosis membrane module 10 after each test is finished; the desalinated water which is not drained flows back to the test water tank 3.
The method for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor comprises the following specific steps;
step one, adjusting the pH value of the pretreated seawater to 9-10, standing for 20-26 hours, and injecting into the test water tank 3; the scale inhibitor in the chemical adding equipment 8 can be injected into the test water tank 3 and mixed with the liquid in the test water tank 3; devices such as a heat exchanger or a heater arranged in the test water tank 3 can be opened, so that the temperature of the liquid mixed in the test water tank 3 is stabilized at 29-31 ℃;
step two, the water inlet pump 5, the security filter 7, the high-pressure pump 9 and the reverse osmosis membrane component 10 can be started in sequence; the concentrated solution and the penetrating fluid obtained after the reverse osmosis membrane component 10 is filtered can be completely refluxed to the test water tank 3; the water inlet pressure of the reverse osmosis membrane component 10 can be detected, the flux, the recovery rate and the flow rate of penetrating fluid of the reverse osmosis membrane can be detected when the water inlet pressure reaches a set value and is stable, and the concentration of chloride ions and calcium ions in the liquid in the test water tank 3 can be detected at intervals according to a set cycle detection period after the flux, the recovery rate and the flow rate of penetrating fluid reach the design requirements of reverse osmosis membrane component 10 manufacturers, so that the concentration multiple of the chloride ions and the calcium ions can be calculated; the method can synchronously drain at least a part of the desalted water generated by the reverse osmosis membrane module 10 after the test is finished each time, and can drain all the desalted water generated by the reverse osmosis membrane module 10; the desalinated water which is not drained back to the test water tank 3. The cycle detection can be stopped until the reverse osmosis membrane module 10 is scaled;
and step three, taking the cycle number as an abscissa and the concentration times of the chloride ions and the calcium ions as an ordinate, and drawing a relation curve of the concentration times of the chloride ions and the calcium ions and the cycle number.
The cycle period interval may be set to 1 hour. The cycle period interval may be selected based on the reverse osmosis membrane module 10 and the amount of seawater to be tested in the cycle.
The working principle of the present invention is described below with reference to a preferred embodiment of the present invention:
the utility model discloses a reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation system, which comprises a test system and an online monitoring system; the evaluation of the dynamic performance of the seawater desalination scale inhibitor can be realized.
A reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation system comprises a test system and an online monitoring system; the test system is used for simulating the operation condition of reverse osmosis seawater desalination, realizing the dynamic performance test of the reverse osmosis seawater desalination scale inhibitor, and the on-line monitoring system is used for detecting the parameters of the liquid for testing in each link of the system on line, wherein:
the test system comprises: the system comprises a test system, wherein the test system consists of a raw water tank 1, a raw water pump 2, a test water tank 3, a heat exchanger, a water inlet pump 5, a pipeline mixer 6, a security filter 7, a dosing device 8, a high-pressure pump 9 and a reverse osmosis membrane assembly 10. Wherein:
the raw water in the raw water tank 1, i.e., the pretreated seawater a, is transferred to the test water tank 3 by the raw water pump 2 to become test water.
The scale inhibitor is conveyed into the test water tank 3 by the chemical adding equipment 8, the liquid obtained by mixing the scale inhibitor and test water is subjected to temperature regulation by the heat exchanger, is uniformly mixed by the pipeline mixer 6, is conveyed to the security filter 7 by the water inlet pump 5, and is further filtered by the security filter 7.
High-pressure pump 9 delivers the seawater filtered by canister filter 7 from canister filter 7 to reverse osmosis membrane module 10.
Two output ports of the reverse osmosis membrane component 10 are respectively connected with an input port of the test water tank 3. The test water tank 3 can receive the concentrated seawater or the desalted water which flows out of the original water tank 1 and flows back from the reverse osmosis component, and can stir and regulate the temperature of the concentrated seawater or the desalted water.
An electric stirrer, a liquid input port for seawater and the like, a medicine inlet for inputting medicine liquid and the like can be arranged on the upper cover of the test water tank 3; the side wall of the test water tank 3 can be provided with a communicated tubular liquid level meter, an output port for outputting test liquid and a maintenance port for maintenance, and the test water tank 3 can be provided with an emptying pipe and an overflow pipe; the emptying pipe is used for emptying the liquid in the test water tank 3; the overflow pipe is used for overflowing liquid exceeding a set water level. The power of the electric stirrer is required to ensure that the liquid in the test water tank 3 can be fully stirred within the normal variation range of the water level.
The original water tank 1 can also be provided with a liquid input port such as seawater, a liquid output port such as seawater, an overflow pipe, a vent pipe, an exhaust pipe and a maintenance port for maintenance. The emptying pipe is used for emptying the liquid in the test water tank 3; the overflow pipe is used for overflowing liquid exceeding a set water level. The exhaust pipe is used for exhausting gas.
The water outlet pipelines of the raw water pump 2 and the water inlet pump 5 are provided with return pipelines to adjust the water inlet amount of the system, and the overhigh pressure of the water pumps is avoided.
The test system adopts a periodic concentration circulating operation mode, wherein a concentrated solution outlet and a penetrating fluid outlet of the reverse osmosis membrane assembly 10 are respectively connected with an input port of the test water tank 3; concentrated water is output from the concentrated solution outlet, and desalted water is output from the penetrating solution outlet, the concentrated water generated by the reverse osmosis membrane assembly 10 is completely circulated to the test water tank 3, and the desalted water periodically partially or completely flows back to the test water tank 3, so that the scaling tendency is increased, and the scale inhibition effect is rapidly expressed. Therefore, the dynamic performance of the seawater desalination scale inhibitor can be quickly, simply and effectively evaluated.
An online monitoring system: comprising a conductivity measuring instrument
Temperature measuring instrument
Liquid level measuring instrument
Pressure measuring instrument
Flow meter
And a pH measuring instrument
And the like. The method is used for realizing online monitoring of different parameter data.
The raw water tank 1 and the test water tank 3 are respectively provided with a conductivity measuring instrument
Liquid level measuring instrument
Temperature measuring instrument
PH measuring instrument
A pressure measuring instrument is arranged at the connecting part of the raw water pump 2 and the test water tank 3
Flow meter
A pressure measuring instrument is arranged at the connecting part of the water inlet pump 5 and the pipeline mixer 6
The connection part of the security filter 7 and the high-pressure pump 9 is provided with a conductivity measuring instrument
Flow meter
A pressure measuring instrument is arranged at the connecting part of the high-pressure pump 9 and the reverse osmosis membrane component 10
Temperature measuring instrument
The connecting part of the reverse osmosis membrane component 10 and the test water tank 3 is provided with a conductivity measuring instrument
Flow meter
The raw water tank 1 is provided with a conductivity meter which is mainly used for monitoring the salt content change of the pretreated seawater and making reference for test preparation; the liquid level meter is arranged to provide reference for starting and stopping the raw water pump 2 and regulating the water quantity of the water tank.
A liquid level monitoring instrument is arranged in the test water tank 3, and a high liquid level alarm function and a low liquid level alarm function can be set.
The test water tank 3 is provided with a conductivity monitoring instrument which has monitoring and programming functions, can monitor the conductivity value of the test water tank 3 and can set an upper limit value.
Be equipped with temperature measuring instrument in experimental water tank 3, this temperature measuring instrument has monitoring and programming function, can monitor the heating temperature of intaking in the water tank to can report to the police according to the high value of predesigned temperature.
An online flowmeter is arranged on a water outlet pipe of the dosing device 8 and used for monitoring dosing flow. Meanwhile, the dosing flow of the dosing device 8 is linked with the flow of the raw water pump 2 of the test water tank 3 and is adjusted according to the inflow of the pretreated seawater.
Referring to fig. 2, the experimental system works as follows:
after pretreatment, the seawater firstly enters the raw water tank 1 of the device. Raw water (pretreated seawater) in the raw water tank 1 is conveyed to the test water tank 3 by the raw water pump 2. The scale inhibitor of the dosing device 8 is added into the test water tank 3. The scale inhibitor is mixed with seawater.
A heat exchanger is arranged in the test water tank 3, and a heating coil is arranged in the heat exchanger and can heat liquid in the test water tank 3 to reach a set temperature.
The liquid mixed with the scale inhibitor in the test water tank 3 is used as test liquid, and the test liquid is conveyed to the cartridge filter 7 by the water inlet pump 5. A pipe mixer 6 may be provided between the intake pump 5 and the cartridge filter 7 to sufficiently mix the seawater and the scale inhibitor.
The cartridge filter 7 further filters the test liquid, and the filtering precision can be controlled to be less than 5 um. High pressure pump 9 is responsible for delivering filtered test liquid from cartridge filter 7 to reverse osmosis membrane module 10 and providing the water pressure required for the reverse osmosis process. The test influent water is treated by the reverse osmosis membrane module 10 to produce desalinated water and concentrated seawater.
The principle of the evaluation method for the dynamic performance of the reverse osmosis seawater desalination scale inhibitor is as follows:
and evaluating the scale inhibition performance of the scale inhibitor on calcium scale by a periodic concentration cycle test method. Each cycle period is divided into two processes of circulation operation and concentration operation. In the circulating operation process, the reverse osmosis desalted water and the concentrated seawater all flow back to the test water tank 3. In the process of concentration operation, reverse osmosis desalted water is discharged, and concentrated seawater flows back to the test water tank 3. The chloride ions as non-scaling ions can linearly increase along with the concentration multiple of the seawater, the calcium ions as scaling ions linearly increase along with the concentration multiple of the seawater when scaling does not occur, once scaling occurs, the concentration multiple of the calcium ions deviates from the curve of the concentration multiple of the chloride ions, and the larger the deviation is, the more serious the scaling degree is. The time and degree of deviation of the scale inhibitors with different performances are different, so that the scale inhibition performance of the scale inhibitor is judged.
The evaluation method of the dynamic performance of the reverse osmosis seawater desalination scale inhibitor comprises the following steps:
the pH value of the pretreated seawater can be adjusted to 9-10 (+ -0.1), the seawater can be kept stand for 24 hours, the pH value is basically stable, and the test is started. The pH value of the seawater is adjusted to 9-10 (+ -0.1), the scaling tendency can be increased, the test effect is improved, and the test time is shortened.
After the water quality is stable, the water enters the system, stable circulation operation is started, after the reverse osmosis inlet water temperature is stabilized to 30 +/-1 ℃, the inlet water pressure and the recovery rate are stable, and the parameters of the reverse osmosis membrane such as flux, the recovery rate and the flow rate meet the design requirements of membrane manufacturers, a first circulation period test is started, and after the reverse osmosis membrane module 10 is used for processing, desalinated water and concentrated seawater are produced and all flow back to the test water tank 3.
And then, starting periodic concentration cycle operation, namely after the first cycle operation is performed for 1h, discharging a certain amount of produced water, entering a second cycle, keeping the recovery rate unchanged, and after the full cycle operation is performed for 1h, discharging a certain amount of produced water again, and entering the next cycle. This cycling test was repeated periodically until fouling occurred on the concentrate side.
The total cycle interval is preferably adjusted based on concentration gradient, degree of fouling and performance of the scale inhibitor.
The chloride ion and calcium ion concentrations in the test water tank 3 are detected at the end of each cycle period, and the chloride ion and calcium ion concentration times are calculated as in formulas (1) and (2):
in the formula:
KCl,i-chloride ion concentration multiple in cycle i;
KCa,i-calcium ion concentration multiple in cycle i;
CCl,0-the concentration of chloride ions in milligrams per liter (mg/L) in the initial feed to the circulation tank;
CCl,i-the concentration of chloride ions in milligrams per liter (mg/L) in the feed water of the tank of cycle i;
CCa,0-the value of the concentration of calcium ions in milligrams per liter (mg/L) in the initial feed water of the circulation tank;
CCa,i-the concentration of calcium ions in the feed water of the tank of the i-th cycle period is given in milligrams per liter (mg/L).
Referring to FIG. 4, K is plotted by using the number of cycles per cycle as the abscissa and the concentration factor of chloride ion and calcium ion as the ordinateCl,i、KCa,iVersus cycle number. Under normal conditions KCl,i、KCa,iThe concentration of calcium ions is not changed linearly once scaling begins, and the concentration curve of chloride ions deviates from the concentration curve, and the scaling degree is more serious when the deviation is larger. The time and the degree of deviation of the antisludging agents with different properties can be differentAnd judging the scale inhibition performance of the scale inhibitor.
The above-mentioned embodiments are only used for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, the scope of the present invention should not be limited by the embodiment, that is, all equivalent changes or modifications made by the spirit of the present invention should still fall within the scope of the present invention.
Claims (10)
1. A reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation system is characterized by comprising a test system, wherein the test system comprises dosing equipment, a test water tank, a water inlet pump, a cartridge filter, a high-pressure pump and a reverse osmosis membrane component; the output port of the dosing equipment is communicated with the medicine inlet of the test water tank; the test water tank, the water inlet pump, the cartridge filter, the high-pressure pump and the reverse osmosis membrane module are sequentially connected to form a liquid circulation loop, wherein a concentrated solution outlet and a penetrating solution outlet of the reverse osmosis membrane module are respectively connected with an input port of the test water tank.
2. The reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation system of claim 1, wherein the test system further comprises a raw water tank and a raw water pump; the raw water tank, the raw water pump and the test water tank are sequentially connected; the raw water tank stores seawater which is not desalted, and the seawater in the raw water tank is conveyed into the test water tank through the raw water pump.
3. The system for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor according to claim 1, wherein the test system further comprises a temperature control heater, the temperature control heater comprises an electric heating rod, a temperature sensor and a temperature controller, and the electric heating rod is arranged in the test water tank and heats liquid in the test water tank; the temperature sensor is used for measuring the temperature of liquid in the test water tank; the temperature controller receives signals from the temperature sensor and outputs signals to control the electric heating rod to work.
4. The system for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor according to claim 1, wherein a heat exchanger is arranged in the test water tank.
5. The system for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor according to claim 1, wherein the test water tank is provided with an upper cover, and the upper cover is provided with a stirrer for stirring liquid in the test water tank.
6. The system for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor according to claim 1, wherein a pipeline mixer is arranged between the water inlet pump and the cartridge filter.
7. The system for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor according to claim 1, wherein a backflow pipeline is arranged between the water outlet and the water inlet of the water inlet pump.
8. The system for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor according to claim 1, wherein a vent pipe is arranged at the bottom of the test water tank.
9. The system for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor according to claim 1, wherein the reverse osmosis membrane module comprises a plurality of reverse osmosis membrane units connected in parallel, each reverse osmosis membrane unit is independently opened and closed, and a liquid inlet, a concentrated solution outlet and a penetrating fluid outlet of each reverse osmosis membrane unit are connected with sampling pipes.
10. The system for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor according to claim 2, further comprising an online monitoring system; the online monitoring system comprises a conductivity measuring instrument, a temperature measuring instrument, a liquid level measuring instrument, a pressure measuring instrument and a flow measuring instrument; the detection parts of the conductivity measuring instrument are respectively arranged in the test water tank, the output port of the cartridge filter and the permeate output port of the reverse osmosis membrane module; the detection parts of the temperature measuring instrument are respectively arranged in the test water tank and the input port of the reverse osmosis membrane component; the detection part of the liquid level measuring instrument is arranged in the test water tank; the detection parts of the pressure measuring instruments are respectively arranged at the output port of the raw water pump, the output port of the water inlet pump, the output port of the high-pressure pump and the concentrated solution output port of the reverse osmosis membrane module; and the detection part of the flow measuring instrument is respectively arranged at the input port of the test water tank, the input port of the high-pressure pump and the penetrating fluid output port of the reverse osmosis membrane module.
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| CN112964488B (en) * | 2021-02-02 | 2021-09-21 | 自然资源部天津海水淡化与综合利用研究所 | Modularized universal test platform and test method for handheld seawater desalination machine |
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