CN1286544C - On-line defect diagnosis method for rolling type reverse osmosis membrane device - Google Patents
On-line defect diagnosis method for rolling type reverse osmosis membrane device Download PDFInfo
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- CN1286544C CN1286544C CN 200510026206 CN200510026206A CN1286544C CN 1286544 C CN1286544 C CN 1286544C CN 200510026206 CN200510026206 CN 200510026206 CN 200510026206 A CN200510026206 A CN 200510026206A CN 1286544 C CN1286544 C CN 1286544C
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Abstract
The present invention relates to an on-line defect diagnosing method for rolled reverse osmosis membrane devices. A method of residence time distribution is adopted to diagnose fluid defects of a rolled reverse osmosis membrane device. NaCl is used as tracer agents and is injected into an inlet of a running rolled reverse osmosis membrane device to be detected through high voltage pulse injecting technique, and then, a conductivity meter is utilized at an outlet of the membrane device to detect a curve of the NaCl concentration varying with the time. A computer is utilized to carry out value conversion according to the curve, defect characteristic parameters D/uL of the membrane device can be obtained, and then, the defect information of the membrane device can be obtained. The present invention has the advantages of simple and convenient diagnosis programs and low cost of devices and can rapidly diagnose the flow pattern in a rolled reverse osmosis membrane device and the deflection degree of ideal piston flow to determine the defects of fluid flows to provide references for the optimization of membrane device design.
Description
Technical field
The present invention relates to a kind of inline diagnosis method of rolling type reverse osmosis membrane device defective, adopt time of staying distribution technique, diagnosis film device inner fluid mobile defect detects scaling condition, improve the overall operation performance of rolling type reverse osmosis membrane device, provide foundation for optimizing the design of film device.Belong to membrane separation technique field in the chemical engineering science.
Background technology
Counter-infiltration (RO) water technology has under the normal temperature that operation, energy consumption are low, compact equipment, the outstanding advantage of operating cost economic dispatch, most economical seawater and technique of desalinating saline water have been become, and be widely used in ultra-pure water preparation, power plant's high-pressure boiler with concentrating and separating and purification process in water desalination purification, Industrial Wastewater Treatment, food and beverage processing and the various chemical field, will become one of leading new and high technology of 21 century.
Rolling type reverse osmosis membrane device is because every performance indications are all better, and the long-pending density of membrane stack is big, salt rejection rate is high, the life-span is long, and becomes selected maximum film device.Though rolling type reverse osmosis membrane device has higher comprehensive desalting performance, but still the development space of the cost that has substantial degradation.Studies show that still there are a lot of defectives in existing rolling type reverse osmosis membrane device, as the dead volume that exists in service, the fluid flow distribution is inhomogeneous, and fouling easily takes place on the contact point of film and filter, and research also shows the maximum phenomenon that has mass tranfer coefficient.The existence of these defectives greatly reduces the overall performance of film device.
A main target of rolling type reverse osmosis membrane device design is to make feedwater flow distribution in passage even, the critical restrictive condition of existing counter-infiltration system design and film fouling is all based on such hypothesis, be that the distribution of film device inner fluid is uniformly, do not have defectives such as dead volume.Yet above-mentioned defective exists in the film device, has reduced film device performance thus.Relevantly studies show that the inhomogeneous very big negative effect that causes of flowing of this fluid, to CaSO in the coiled reverse osmosis membrane
4And CaCO
3Studies show that of scale problems, the place of easy fouling is the contact point of film surface and filter, even fouling has taken place film under the unsaturated situation of main body solution.Therefore, the online diagnosing technique of support shaft of development rolling type reverse osmosis membrane device defective will provide the basis to the combination property of optimizing and improve whole film device, and the normal operation that guarantees system is had crucial meaning.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of inline diagnosis method of rolling type reverse osmosis membrane device defective is provided, and the fluid defective of diagnosing new and old rolling type reverse osmosis membrane device to be in operation and to exist detects scaling condition, in time adjust operational factor, guarantee the normal operation of system; The design of the film of optimization and improvement simultaneously device.
For realizing such purpose, in the technical scheme of the present invention, adopt the method for time of staying distribution, fluid defective to rolling type reverse osmosis membrane device is diagnosed, adopt NaCl as tracer, by the high-voltage pulse injection technique, be injected into rolling type reverse osmosis membrane device to be detected inlet in service, utilize conductivity gauge to detect NaCl concentration curve over time then in film device exit, carry out numerical transformation by computer according to curve, can obtain film device defective characterization parameter D/uL, thereby obtain the information of film device defective.
The concrete implementation step of the inventive method is as follows:
1, the injection container of tracer NaCl solution is installed and is injected valve at the rolling type reverse osmosis membrane device entrance point, and link to each other with the high pressure air bottle of 60bar; High-speed response conductivity gauge and continuous with computer is installed in the rolling type reverse osmosis membrane device exit.
2, regulate the stable extremely setting value of film device intake pressure and flow of inlet water, adopt pulse mode to carry out time of staying distribution tests.Open and inject 1 second of valve, utilize the pressure-air of 60bar will inject the NaCl injection rolling type reverse osmosis membrane device of container.Used NaCl concentration is 5g/L-300g/L.Gather per 0.1 second pairing tracer exit concentration value in film device exit, carry out time of staying distribution tests.Temperature is controlled at 28-33 ℃ during test.Keep intake pressure constant then, press from little extremely big order change flow of inlet water, and, all carry out time of staying distribution tests each feed water flow value.
3, change intake pressure to another setting value, and it is constant to keep-up pressure, presses again from little extremely big order change flow of inlet water, and, carry out time of staying distribution tests each feed water flow value.Repeat test like this, set the intake pressure time of staying distribution of corresponding different flow of inlet water down until having measured each.
4, will test the time of staying distributed data that is collected and carry out the axial dispersion model numerical transformation, can obtain the characterization parameter of film device defective.The present invention adopts and disperses number D/uL to characterize flow pattern in the rolling type reverse osmosis membrane device, according to the numerical value of D/uL and the departure degree of desirable piston flow, determines the defective of rolling type reverse osmosis membrane device, finishes inline diagnosis.D/uL numerical value is more little, shows the approaching more desirable piston flow of flow pattern in the film device, and performance is good more, and defective is few more; Otherwise D/uL numerical value is big more, shows that film device performance is poor more, and defective is many more.
The diagnostic program that the inventive method adopts is simple and convenient, and equipment cost is low, can diagnose out the interior flow pattern of rolling type reverse osmosis membrane device and the departure degree of desirable piston flow apace, thereby determines fluid mobile defect.Applied widely, as can be used for new film device, old film device, the defect diagonsis of film device such as fouling film device; Also be applicable to the laboratory with the membranelle device as 2.5 inches, industrial big film device defect diagonsis as film devices such as 8 inches.The present invention provides reliable foundation for the safe operation of the extensive rolling counter-infiltration system that adopts and the optimal design of film device in the current industrial.
Description of drawings
Fig. 1 is the result of embodiment of the invention 1-2.
Fig. 2 is the result of embodiment of the invention 3-5.
The specific embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is further described.
Embodiment 1
Present embodiment carries out diagnostic test to the new diameter SWC1 of 8 inches Hydranautics companies rolling type reverse osmosis membrane device.
The injection container of tracer NaCl solution is installed and is injected valve at the rolling type reverse osmosis membrane device entrance point, and link to each other with the high pressure air bottle of 60bar; High-speed response conductivity gauge and continuous with computer is installed in the rolling type reverse osmosis membrane device exit.
It is stable to setting value to regulate film device intake pressure and flow of inlet water.Carry out the time of staying during distribution tests, adopting pulse mode to carry out.Open 1 second of valve, the NaCl that utilizes the pressure-air of 60bar will inject container injects rolling type reverse osmosis membrane device.Used NaCl concentration is 300g/L.Gather per 0.1 second pairing tracer exit concentration value in film device exit, carry out time of staying distribution tests.Keep intake pressure constant, press from little extremely big order change flow of inlet water, and, all carry out time of staying distribution tests each feed water flow value.
Change intake pressure to another setting value (the present embodiment test pressure is respectively 10bar, 20bar, 30bar), and it is constant to keep-up pressure, again by (the present embodiment test traffic is 1-10m to big order change flow of inlet water from little
3/ h, corresponding Reynolds number are 50-370), and, carry out time of staying test to each feed water flow value.Repeat test like this, set the intake pressure time of staying distribution of corresponding different flow of inlet water down until having measured each.Probe temperature is controlled at 28-33 ℃.
The time of staying distributed data that test is collected carries out the axial dispersion model numerical transformation, obtains the characterization parameter D/uL of film device defective.
The result is shown in one group below in the data point among Fig. 1.As can be seen from the figure, increase flow of inlet water, disperse number D/uL to reduce, show that flow pattern changes to the direction that approaches desirable piston flow, defective reduces.Be that new commercial scale rolling type reverse osmosis membrane device performance improves with the flow of inlet water increase.Simultaneously as can be seen from the figure, pressure increases to 30bar from 10bar, disperse number not change, illustrate that the change of pressure is not influential to the runner geometry in the rolling type reverse osmosis membrane device, promptly pressure change has no effect to variations in flow patterns in the new rolling type reverse osmosis membrane device.
Present embodiment shows that time of staying distribution technique can make things convenient for that flow pattern detects the variation of flow pattern defective with the variation of flow of inlet water in the diagnostic industry scale rolling type reverse osmosis membrane device exactly, and can detected pressures change the convection defect influence.New plant-scale rolling type reverse osmosis membrane device (D/uL=0.045-0.065) has great departing from desirable piston flow (D/uL＜0.001), has fluid mobile defect clearly.
Embodiment 2
Present embodiment carries out diagnostic test to the old diameter SWC1 of 8 inches Hydranautics companies rolling type reverse osmosis membrane device.
The injection container of tracer NaCl solution is installed and is injected valve at the rolling type reverse osmosis membrane device entrance point, and link to each other with the high pressure air bottle of 60bar; High-speed response conductivity gauge and continuous with computer is installed in the rolling type reverse osmosis membrane device exit.
It is stable to setting value to regulate film device intake pressure and flow of inlet water.Carry out the time of staying during distribution tests, adopting pulse mode to carry out.Open 1 second of valve, the NaCl that utilizes the pressure-air of 60bar will inject container injects rolling type reverse osmosis membrane device.Used NaCl concentration is 300g/L.Gather per 0.1 second pairing tracer exit concentration value in film device exit, carry out time of staying distribution tests.It is constant to keep-up pressure, and presses from little extremely big order to change flow of inlet water, and to each feed water flow value, all carries out time of staying distribution tests.
Change intake pressure to another setting value (the present embodiment test pressure is respectively 10bar, 20bar, 30bar, 40bar), and it is constant to keep-up pressure, again by (the present embodiment test traffic is 1-10m to big order change flow of inlet water from little
3/ h, corresponding Reynolds number are 50-370), and, carry out time of staying test to each feed water flow value.Repeat test like this, set the intake pressure time of staying distribution of corresponding different flow of inlet water down until having measured each.Probe temperature is controlled at 28-33 ℃.
The time of staying distributed data that test is collected carries out the axial dispersion model numerical transformation, obtains the characterization parameter D/uL of film device defective.
The result is shown in one group above in Fig. 1 data point.As can be seen from the figure, increase flow of inlet water, disperse number D/uL to reduce, show that flow pattern changes to the direction that approaches desirable piston flow, defective reduces.Be that old commercial scale rolling type reverse osmosis membrane device performance improves with the flow of inlet water increase.Simultaneously as can be seen from the figure, pressure increases to 40bar from 10bar, disperse number not change, illustrate that the change of pressure is not influential to the runner geometry in the rolling type reverse osmosis membrane device, promptly pressure change has no effect to variations in flow patterns in the new rolling type reverse osmosis membrane device.Fig. 1 also shows, compares (embodiment 1) with data point in the new rolling type reverse osmosis membrane device, and old film device disperses number D/uL to increase when other condition is identical.This illustrates that the new film device of old film device inner fluid mobile defect has increased.
Present embodiment shows that time of staying distribution technique can make things convenient for that flow pattern detects the variation of flow pattern defective with the variation of flow of inlet water in the old rolling type reverse osmosis membrane device of diagnostic industry scale exactly, and can detected pressures change the convection defect influence.Old plant-scale rolling type reverse osmosis membrane device (D/uL=0.09-0.12) has great departing from desirable piston flow (D/uL＜0.001), also has bigger fluid mobile defect than new commercial scale rolling type reverse osmosis membrane device (D/uL=0.045-0.065).
Embodiment 3
Present embodiment carries out diagnostic test to the 2.5 inches new TW30-2514 of the Dow Chemical Company rolling type reverse osmosis membrane devices.
The injection container of tracer NaCl solution is installed and is injected valve at the rolling type reverse osmosis membrane device entrance point, and link to each other with the high pressure air bottle of 60bar; High-speed response conductivity gauge and continuous with computer is installed in the rolling type reverse osmosis membrane device exit.
Carry out the time of staying during distribution tests, adopting pulse mode to carry out.Open 1 second of valve, the NaCl that utilizes the pressure-air of 60bar will inject container injects rolling type reverse osmosis membrane device.Used NaCl concentration is 20g/L.Gather per 0.1 second pairing tracer exit concentration value in film device exit, carry out time of staying distribution tests.
Regulate film device intake pressure and be stabilized in a setting value (20bar), by changing flow of inlet water (flow is 200-950L/h) from little extremely big order, corresponding Reynolds number is changed to 50-220, to each feed water flow value, all carries out time of staying distribution tests then.
Temperature is controlled at 28-33 ℃ during test.
The time of staying distributed data that test is collected carries out the axial dispersion model numerical transformation, obtains the characterization parameter D/uL of film device defective.
The result is shown in the data point among Fig. 2 nethermost one group.As can be seen from the figure, increase flow of inlet water, disperse number D/uL to reduce, show that flow pattern changes to the direction that approaches desirable piston flow, defective reduces.Be that new rolling type reverse osmosis membrane device performance improves with the flow of inlet water increase.
Present embodiment shows that time of staying distribution technique can make things convenient for that flow pattern detects the variation of flow pattern defective with the variation of flow of inlet water in the diagnostic test chamber scale rolling type reverse osmosis membrane device exactly.New laboratory scale rolling type reverse osmosis membrane device (D/uL=0.012-0.04) has great departing from desirable piston flow (D/uL＜0.001), has fluid mobile defect clearly.
Embodiment 4
Present embodiment carries out diagnostic test to the 2.5 inches TW30-2514 of the Dow Chemical Company rolling type reverse osmosis membrane devices of new fouling.The film device of known this fouling makes permeate flow descend 14%.
The injection container of tracer NaCl solution is installed and is injected valve at the rolling type reverse osmosis membrane device entrance point, and link to each other with the high pressure air bottle of 60bar; High-speed response conductivity gauge and continuous with computer is installed in the rolling type reverse osmosis membrane device exit.
When carrying out time of staying diagnostic test, adopt pulse mode to carry out.Open 1 second of valve, the NaCl that utilizes the pressure-air of 60bar will inject container injects rolling type reverse osmosis membrane device.Used NaCl concentration is 20g/L.Gather per 0.1 second pairing tracer exit concentration value in film device exit, carry out time of staying distribution tests.
Regulate film device intake pressure and be stabilized in a setting value (20bar), by changing flow of inlet water (flow is 200-950L/h) from little extremely big order, corresponding Reynolds number is changed to 50-220, to each feed water flow value, all carries out time of staying distribution tests then.
Temperature is controlled at 28-33 ℃ during test.
The time of staying distributed data that test is collected carries out the axial dispersion model numerical transformation, obtains the characterization parameter D/uL of film device defective.
The result is shown in one group in the middle of the data point among Fig. 2.As can be seen from the figure, increase flow of inlet water, disperse number D/uL to reduce, show that flow pattern changes to the direction that approaches desirable piston flow, defective reduces.The rolling type reverse osmosis membrane device performance that is fouling improves with the flow of inlet water increase.
Present embodiment shows that time of staying distribution technique can make things convenient for and diagnoses in the fouling rolling type reverse osmosis membrane device flow pattern with the variation of flow of inlet water exactly, detects the variation of flow pattern defective.Descend laboratory scale rolling type reverse osmosis membrane device (D/uL=0.025-0.045) and the desirable piston flow (D/uL＜0.001) of 14% fouling of penetrating fluid has great departing from, and has fluid mobile defect clearly.In conjunction with the embodiments 3, as can be seen, fouling film device is bigger than the D/uL value of fouling rolling type reverse osmosis membrane device (D/uL=0.012-0.04) not, i.e. the bigger fluid mobile defect of fouling film device existence.
Embodiment 5
Present embodiment carries out diagnostic test to the 2.5 inches TW30-2514 of the Dow Chemical Company rolling type reverse osmosis membrane devices of new fouling.The film device of known this fouling makes permeate flow descend 36%.
The injection container of tracer NaCl solution is installed and is injected valve at the rolling type reverse osmosis membrane device entrance point, and link to each other with the high pressure air bottle of 60bar; High-speed response conductivity gauge and continuous with computer is installed in the rolling type reverse osmosis membrane device exit.
Carry out the time of staying during distribution tests, adopting pulse mode to carry out.Open 1 second of valve, the NaCl that utilizes the pressure-air of 60bar will inject container injects rolling type reverse osmosis membrane device.Used NaCl concentration is 20g/L.Gather per 0.1 second pairing tracer exit concentration value in film device exit, carry out time of staying distribution tests.
Regulate film device intake pressure and be stabilized in a setting value (20bar), by changing flow of inlet water (flow is 200-950L/h) from little extremely big order, corresponding Reynolds number is changed to 50-220, to each feed water flow value, all carries out time of staying distribution tests then.
Temperature is controlled at 28-33 ℃ during test.
The time of staying distributed data that test is collected carries out the axial dispersion model numerical transformation, obtains the characterization parameter D/uL of film device defective.
The result is shown in the data point among Fig. 2 uppermost one group.As can be seen from the figure, increase flow of inlet water, disperse number D/uL to reduce, show that flow pattern changes to the direction that approaches desirable piston flow, defective reduces.The rolling type reverse osmosis membrane device performance that is fouling improves with the flow of inlet water increase.
Present embodiment shows once more that time of staying distribution technique can make things convenient for and diagnoses in the fouling rolling type reverse osmosis membrane device flow pattern with the variation of flow of inlet water exactly, detects the variation of flow pattern defective.The laboratory scale rolling type reverse osmosis membrane device (D/uL=0.036-0.056) of the fouling of penetrating fluid decline 36% has great departing from desirable piston flow (D/uL＜0.001), has fluid mobile defect clearly.In conjunction with the embodiments 3 and 4, as can be seen, there is bigger fluid mobile defect in fouling film device than fouling rolling type reverse osmosis membrane device (D/uL=0.012-0.04) not; Compare with the descend diagnosis of 14% fouling (D/uL=0.025-0.045) of penetrating fluid, descend 36% amount of scale buildup of penetrating fluid has increased, and its D/uL has also increased, and promptly the flow pattern defective has also increased with amount of scale buildup.
Claims (1)
1, a kind of inline diagnosis method of rolling type reverse osmosis membrane device defective is characterized in that comprising the steps:
1) the injection container of tracer NaCl solution is installed and is injected valve at the rolling type reverse osmosis membrane device entrance point, and link to each other, high-speed response conductivity gauge and continuous with computer is installed in the rolling type reverse osmosis membrane device exit with the high pressure air bottle of 60bar;
2) regulate the stable extremely setting value of film device intake pressure and flow of inlet water, adopt pulse mode to carry out time of staying distribution tests, open and inject 1 second of valve, utilize the pressure-air of 60bar will inject the NaCl injection rolling type reverse osmosis membrane device of container, used NaCl concentration is 5g/L-300g/L; Gather per 0.1 second pairing tracer exit concentration value in film device exit, carry out time of staying distribution tests, temperature is controlled at 28-33 ℃ during test; Keep intake pressure constant then, press from little extremely big order change flow of inlet water, and, all carry out time of staying distribution tests each feed water flow value;
3) change intake pressure to another setting value, and it is constant to keep-up pressure, press again from little extremely big order change flow of inlet water, and each feed water flow value is carried out time of staying distribution tests, set intake pressure time of staying distribution of the different flow of inlet water of correspondence down until having measured each;
4) will test the time of staying distributed data that is collected and carry out the axial dispersion model numerical transformation, obtain the characterization parameter of film device defective, D/uL is counted in the dispersion that promptly characterizes flow pattern in the rolling type reverse osmosis membrane device, according to the numerical value of D/uL and the departure degree of desirable piston flow, determine the defective of rolling type reverse osmosis membrane device, finish inline diagnosis.
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| CN 200510026206 CN1286544C (en) | 2005-05-26 | 2005-05-26 | On-line defect diagnosis method for rolling type reverse osmosis membrane device |
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| CN 200510026206 CN1286544C (en) | 2005-05-26 | 2005-05-26 | On-line defect diagnosis method for rolling type reverse osmosis membrane device |
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| CN1286544C true CN1286544C (en) | 2006-11-29 |
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| CN106770403B (en) * | 2016-11-15 | 2020-07-14 | 中国科学院上海高等研究院 | Method for detecting influence of different pollutants on reverse osmosis membrane on performance of membrane device |
| JP6942252B2 (en) * | 2018-06-18 | 2021-09-29 | 三菱電機株式会社 | Driving support device and driving support method |
| WO2020103038A1 (en) * | 2018-11-21 | 2020-05-28 | 深圳市柔宇科技有限公司 | Method for detecting defect of thin film transistor array substrate |
| US20220185706A1 (en) * | 2019-04-01 | 2022-06-16 | Kemira Oyj | Monitoring of membrane fouling |
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