CN111141871A - Reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation system and method - Google Patents
Reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation system and method Download PDFInfo
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- CN111141871A CN111141871A CN201911385249.8A CN201911385249A CN111141871A CN 111141871 A CN111141871 A CN 111141871A CN 201911385249 A CN201911385249 A CN 201911385249A CN 111141871 A CN111141871 A CN 111141871A
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Abstract
The invention discloses a dynamic performance evaluation system of a reverse osmosis seawater desalination scale inhibitor, which 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. The invention also discloses a method for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor. The method for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor simulates the operation condition of reverse osmosis seawater desalination, and realizes the rapid and simple completion of the dynamic test of the seawater desalination scale inhibitor.
Description
Technical Field
The invention relates to a device and a method for evaluating the dynamic performance of a scale inhibitor for water treatment, in particular to a system and a method for evaluating the dynamic performance of a reverse osmosis seawater desalination scale inhibitor.
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. 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 invention provides a system and a method for evaluating the dynamic performance of a reverse osmosis seawater desalination scale inhibitor, which are quick, simple and effective for solving the technical problems in the known technology.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: 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, 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.
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 invention also provides a reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation method by utilizing the reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation system, which comprises the following steps: injecting the pretreated seawater into a test water tank, conveying the scale inhibitor into the test water tank by using a dosing device, and mixing the scale inhibitor with liquid in the test water tank; the mixed liquid is conveyed into a cartridge filter by a water inlet pump for filtering, and the filtered liquid is conveyed to a reverse osmosis membrane component by a high-pressure pump; concentrated water generated by the reverse osmosis membrane component flows back to the test water tank and forms water circulation; periodically detecting the concentrations of chloride ions and calcium ions in the liquid in the test water tank in the water circulation process; and synchronously draining at least one part of penetrating fluid generated by the reverse osmosis membrane module after each test is finished; the permeate which was not drained was returned to the test tank.
Further, the method comprises the following specific steps;
adjusting the pH value of the pretreated seawater to 9-10, standing for 20-26 hours, and injecting into the test water tank; injecting a scale inhibitor in a dosing device into the test water tank and mixing the scale inhibitor with liquid in the test water tank; stabilizing the temperature of the liquid mixed in the test water tank at 29-31 ℃;
step two, starting a water inlet pump, a cartridge filter, a high-pressure pump and a reverse osmosis membrane component in sequence; enabling the concentrated solution and the penetrating fluid obtained after the reverse osmosis membrane component is filtered to completely flow back to the test water tank; detecting the water inlet pressure of the reverse osmosis membrane component, detecting the flux, the recovery rate and the flow rate of penetrating fluid of the reverse osmosis membrane when the water inlet pressure reaches a set value and is stable, detecting the concentrations of chloride ions and calcium ions in liquid in a test water tank according to a set cyclic detection period interval after the flux, the recovery rate and the flow rate of the penetrating fluid reach the design requirements of reverse osmosis membrane component manufacturers, and calculating to obtain the concentration multiple of the chloride ions and the calcium ions; synchronously draining penetrating fluid generated by at least one part of reverse osmosis membrane assemblies after each test is finished, and stopping the cycle detection until the reverse osmosis membrane assemblies are 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 invention has the advantages and positive effects that:
the dynamic performance evaluation system of the reverse osmosis seawater desalination scale inhibitor can reduce the actual working condition of the reverse osmosis seawater desalination water treatment agent, and can test the dynamic performance of the scale inhibitor under the condition, thereby improving the accuracy of the agent performance evaluation in the field of reverse osmosis seawater desalination water treatment agents.
According to the method for evaluating the dynamic performance of the reverse osmosis seawater and fresh water scale inhibitor, the operation condition of reverse osmosis seawater desalination is simulated, the concentrated seawater generated by the reverse osmosis membrane component is completely circulated to the test water tank, the desalinated water periodically partially or completely flows back to the test water tank, and the circulating liquid is periodically concentrated, so that the scaling tendency is increased, the scale inhibition effect is quickly expressed, the dynamic test of the seawater desalination scale inhibitor is quickly and simply finished, and the dynamic performance evaluation of the scale inhibitor closest to the real condition is realized. 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 view of the present invention;
FIG. 2 is a schematic diagram of the working principle of the present invention;
FIG. 3 is a schematic diagram of the temperature controlled heater configuration of the present invention;
FIG. 4 is a graphical representation of the concentration factor of calcium and chloride ions versus cycle number plotted according to the method of the present invention.
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 enumerated in conjunction with the accompanying drawings, and the following detailed description is given:
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 output port and a penetrating liquid output port 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. The concentrated solution output port outputs concentrated seawater; the penetrating fluid output port outputs the desalted water. The input port of the test water tank 3 may be one or more.
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 invention, 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 the test seawater from the 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 measuring instrument
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 invention also provides an embodiment of a reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation method adopting the reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation system, and the method comprises the following steps: 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 solution 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 simultaneously draining at least a portion of the permeate produced by the reverse osmosis membrane module 10 after each test is completed; the permeate which has not been drained off 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 penetrating fluid generated by at least one part of the reverse osmosis membrane assemblies 10 can be synchronously drained after the test is finished every time, and the penetrating fluid generated by all the reverse osmosis membrane assemblies 10 can be drained; the permeate which has not been drained off is still returned 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 invention is explained below in connection with a preferred embodiment of the invention:
the invention relates to a dynamic performance evaluation system of a reverse osmosis seawater desalination scale inhibitor, which consists of 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 outlet water of the raw water tank 1 and the concentrated solution or the penetrating solution returned by the reverse osmosis component, and can stir and regulate the temperature of the outlet 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 solution namely concentrated seawater output from a concentrated solution outlet, penetrating solution output from a penetrating solution outlet namely desalted water, 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 concentrations of chloride ions and calcium ions in the test water tank 3 are detected at the end of each cycle period, and the concentration times of chloride ions and calcium ions are calculated as shown 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 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 above-mentioned embodiments are only 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 carry out the same, and the present invention shall not be limited to the embodiments, i.e. the equivalent changes or modifications made within the spirit of the present invention shall fall within the scope of the present invention.
Claims (9)
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 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.
5. 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.
6. 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.
7. The system for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor according to claim 1, 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.
8. A reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation method using the reverse osmosis seawater desalination scale inhibitor dynamic performance evaluation system of claim 1 is characterized in that pretreated seawater is injected into a test water tank, and a scale inhibitor is conveyed into the test water tank by a dosing device and is mixed with liquid in the test water tank; the mixed liquid is conveyed into a cartridge filter by a water inlet pump for filtering, and the filtered liquid is conveyed to a reverse osmosis membrane component by a high-pressure pump; concentrated water generated by the reverse osmosis membrane component flows back to the test water tank and forms water circulation; periodically detecting the concentrations of chloride ions and calcium ions in the liquid in the test water tank in the water circulation process; and synchronously draining at least one part of penetrating fluid generated by the reverse osmosis membrane module after each test is finished; the permeate which was not drained was returned to the test tank.
9. The method for evaluating the dynamic performance of the reverse osmosis seawater desalination scale inhibitor according to claim 8, which is characterized by comprising the following specific steps of:
adjusting the pH value of the pretreated seawater to 9-10, standing for 20-26 hours, and injecting into the test water tank; injecting a scale inhibitor in a dosing device into the test water tank and mixing the scale inhibitor with liquid in the test water tank; stabilizing the temperature of the liquid mixed in the test water tank at 29-31 ℃;
step two, starting a water inlet pump, a cartridge filter, a high-pressure pump and a reverse osmosis membrane component in sequence; enabling the concentrated solution and the penetrating fluid obtained after the reverse osmosis membrane component is filtered to completely flow back to the test water tank; detecting the water inlet pressure of the reverse osmosis membrane component, detecting the flux, the recovery rate and the flow rate of penetrating fluid of the reverse osmosis membrane when the water inlet pressure reaches a set value and is stable, detecting the concentrations of chloride ions and calcium ions in liquid in a test water tank according to a set cyclic detection period interval after the flux, the recovery rate and the flow rate of the penetrating fluid reach the design requirements of reverse osmosis membrane component manufacturers, and calculating to obtain the concentration multiple of the chloride ions and the calcium ions; synchronously draining penetrating fluid generated by at least one part of reverse osmosis membrane assemblies after each test is finished, and stopping the cycle detection until the reverse osmosis membrane assemblies are 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.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111672327A (en) * | 2020-07-16 | 2020-09-18 | 上海核工程研究设计院有限公司 | System and method for testing performance of pollution discharge ionization desalination membrane stack of steam generator |
| CN112964488A (en) * | 2021-02-02 | 2021-06-15 | 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 |
| CN115364675A (en) * | 2022-09-16 | 2022-11-22 | 同济大学 | Method and equipment for testing performance of drinking water nanofiltration membrane scale inhibitor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111672327A (en) * | 2020-07-16 | 2020-09-18 | 上海核工程研究设计院有限公司 | System and method for testing performance of pollution discharge ionization desalination membrane stack of steam generator |
| CN112964488A (en) * | 2021-02-02 | 2021-06-15 | 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 |
| 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 |
| CN115364675A (en) * | 2022-09-16 | 2022-11-22 | 同济大学 | Method and equipment for testing performance of drinking water nanofiltration membrane scale inhibitor |
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