CN101259379B - Method for cleaning hollow fiber gas-liquid membrane contactor - Google Patents
Method for cleaning hollow fiber gas-liquid membrane contactor Download PDFInfo
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- CN101259379B CN101259379B CN2007101721572A CN200710172157A CN101259379B CN 101259379 B CN101259379 B CN 101259379B CN 2007101721572 A CN2007101721572 A CN 2007101721572A CN 200710172157 A CN200710172157 A CN 200710172157A CN 101259379 B CN101259379 B CN 101259379B
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Abstract
The invention discloses a method used for washing a hollow fibre gas-liquid membrane contactor in the technical field of environment protection. Pressure gas enters one side of the hollow fibre and enters the other side thereof through a membrane hole to form a gas-liquid mixed phase onflow with the cleaning solution floating in the other side to impact and wash out the pollutants stuck on a membrane wall, thus leading the pollutants to loosen and shed. The pollutants in the membrane hole can be purged to shed by the pressure gas and be carried away along with the gas-liquid mixed phase onflow. By effectively combining a physical washing method with a chemical method and utilizing the gas-liquid mixed phase onflow formed by the pressure gas and the cleaning solution to wash the hollow fibre membrane, the invention can leave out or reduce the usage of chemical cleaning agents and lower the erosion to the membrane caused by chemical cleaning agents, thus the service life of the membrane is prolonged, the cost of technology is reduced, furthermore, no secondary pollution is caused.
Description
Technical field
What the present invention relates to is a kind of method of environmental protection technical field, specifically is a kind of cleaning method that is used for the doughnut gas-liquid membrane contactor.
Background technology
The doughnut gas-liquid membrane contactor is can effectively realize the gas-liquid two-phase mass transfer and the device that do not need gas-liquid two-phase contact.It uses the microporous hollow fiber film that gas, gas-liquid two-phase liquid are separated, and fenestra provides the place of mass transfer for two-phase fluid.Compare with traditional contactor, the doughnut gas-liquid membrane contactor has many advantages.As, gas-liquid two-phase is immiscible, can not produce phenomenons such as liquid flooding, entrainment, and great membrane area can be provided, and amplifies simply, and mass-transfer efficiency also increases greatly than traditional contactor.Because the plurality of advantages of gas-liquid membrane contactor has been showed wide application prospect in chemical industry, environmental protection, food, medicine and other fields.Yet the doughnut gas-liquid membrane contactor can produce film inevitably and pollute after long-time running, causes decrease in efficiency.It is one of principal element of restriction membrane technology broader applications that film pollutes, and has also greatly restricted the broader applications of doughnut gas-liquid membrane contactor.For operational use time and the service life that prolongs film, bring into play its performance better, improve production capacity and efficient, film is polluted to control effectively and the film that pollutes cleaned be necessary.Simple and effective cleaning method is to prevent and solve the important channel that film pollutes.
Gas-liquid membrane contactor is finished in hollow fiber film assembly usually.When gas-liquid membrane contactor was used for GAS ABSORPTION, as carbon dioxide-enriched in blood oxygenation or the beverage etc., gas entered the tube side of doughnut usually, and liquid phase is by the shell side of doughnut.When gas-liquid membrane contactor is used for gas removal, as removing volatile organic matter in removing carbon dioxide or the water in deoxygenation in the water, the water, vacuumize and/or other gas purging in the tube side usually, liquid phase is by the shell side of doughnut.At different application examples or different membrane module designs modes, liquid phase is by shell side or tube side, and gas phase is then passed through opposition side.Because polluting the doughnut gas-liquid membrane contactor efficient that causes, reduces film, generally the cleaning method of Cai Yonging is:, purge with clear water flushing or dry air more at last with direct the make a return journey pollutant on membrane removal surface of circulation flushing of clear water and/or suitable acid solution and/or aqueous slkali etc. in a side of film one side of liquid (in the practical application by).If only use clear water as cleaning fluid in the cleaning process, then water can not recycle.But only can't reach the purpose of effective removal pollutant usually, and must adopt suitable acid and/or aqueous slkali wash cycles pollutant usually with the clear water flushing.Because the gas-liquid membrane module is bigger, and pipeline is longer, in the cleaning fluid cleaning process, need a large amount of cleaning acid solution and/or aqueous slkali, the recovery of cleaning fluid is comparatively difficult after cleaning is finished, often directly fall as liquid waste processing, this is very unreasonable economically, and a large amount of cleaning fluid discharges also is a kind of pollution to environment.In addition, for serious pollution membrane module, even adopt suitable acid and/or aqueous slkali, the pollutant in fenestra surface, the especially fenestra also Chang Wufa is effectively removed.So need seek more effective, economic cleaning method at the pollution of doughnut gas-liquid membrane contactor film.
Through new to looking into of prior art, famous in the world doughnut gas-liquid membrane contactor supplier U.S. Membrana-Charlotte company has provided different cleaning methods and cleaning fluid at different membrane contaminants in the cleaning doughnut gas-liquid membrane contactor guide that it provides.The method of basic step and the foregoing cleaning doughnut gas-liquid membrane contactor that generally adopts is similar.Therefore, there is shortcoming recited above equally.In further retrieving, find identical with the technology of the present invention or similar bibliographical information as yet.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of cleaning method that is used for the doughnut gas-liquid membrane contactor is provided, making it mix the phase turbulent flow by gas one liquid cleans film surface and fenestra internal contamination thing, recover the separation function of doughnut gas-liquid membrane contactor, have efficient, cleaning, energy-conservation characteristics.
The present invention is achieved by the following technical solutions, the present invention utilizes at the shell side of gas-liquid membrane contactor and tube side and passes through liquid cleaning fluid and pressed gas respectively, pressed gas enters doughnut one side, enter opposite side by fenestra, form solution-air with the cleaning fluid that flows in the opposite side and mix turbulent flow mutually, the pollutant that adheres on the membranous wall is clashed into and washes away, make it loosening and break away from.Pollutant in the fenestra can be purged by pressed gas and break away from, and along with solution-air mixing phase turbulent flow is pulled away.
The present invention includes following steps:
The first step, earlier with cleaning fluid through temperature control (5 ℃-85 ℃) and after filtering with setting flow (0.5m
3/ hr-20m
3/ hr) enter the shell side of hollow fiber film assembly.This cleaning fluid can be realized entering shell side from the different ends of membrane contactor by direction valve control; Cleaning fluid is alternately entered, to reach more excellent cleaning performance from two ends by blas.Cleaning fluid can recycle as required.
Described cleaning fluid is clear water, acid solution, or aqueous slkali.
Described acid solution can be hydrochloric acid, sulfuric acid, nitric acid, citric acid etc.
Described aqueous slkali can NaOH, sodium carbonate, sodium metasilicate, clorox, sodium phosphate, potassium hydroxide, calcium carbonate etc.
Described filtration is meant that the filter through 2 μ m or 5 μ m filters.
In second step, open the Compressed Gas (0.15MPa-1MPa) that compression pump or pressure gas cylinder produce, by pressure-regulating valve control flow velocity (0.1m
3/ hr-10m
3/ hr), enter the tube side of hollow fiber film assembly.Pressed gas can be in cleaning setting-up time continous way or batch (-type) ground enter the shell side of membrane module by the fenestra of hollow-fibre membrane.Pressed gas enters the shell side of membrane module by the fenestra of hollow-fibre membrane, forms solution-air with the cleaning fluid that flows in the shell side and mixes turbulent flow mutually, the surface of bump film.
The 3rd step, the cleaning process back segment, available clear water is to the membrane module tube side, and shell side washes, and purges with dry air.
Pressed gas of the present invention at first enters a side of hollow-fibre membrane, the fenestra that passes hollow-fibre membrane then enters opposite side, form solution-air with the cleaning fluid that flows in the opposite side and mix turbulent flow mutually, the surface of bump film, produce bigger local shear forces, the pollutant that adheres on the membranous wall is clashed into and washes away, make it loosening and break away from, reach effective cleaning action.Residual contaminants in the fenestra can effectively be blown off by the purging of pressed gas.Swept away the film surface and the interior pollutant of fenestra that come, along with solution-air mixing phase turbulent flow is pulled away in membrane module.The solution-air that utilization is formed by pressed gas and cleaning fluid is mixed mutually turbulent flow the doughnut polluted membrane is washed, and improves cleaning efficiency effectively, prolongs the service life of doughnut membrane-filtering unit.
The doughnut gas-liquid membrane contactor is applied in the oxygen removal process, because deoxygenation technology is effective, floor space is little, operating cost is low, and energy-conserving and environment-protective, in industry high purity waters such as electronics, pharmacy preparations, be used widely, in boiler supply water deaerating, also more and more used advancing year.Below be example with deoxygenation in the boiler feedwater, for employed new doughnut gas-liquid membrane contactor, adopt the mode of operation of deaeration in condenser, operating condition is: boiler water flow 4.9m
3/ hr, 20 ℃ of boiler water temperature, vacuum be-during 0.095MPa, its oxygen removal efficiency can reach 80%.
The inventive method only needs to increase by one and is made up of-feed arrangement of gases at high pressure compression pump (or pressure gas cylinder), control valve on the basis of former hollow fiber membrane device, need not to dismantle former film component device or additionally add complex device, it is quite convenient to operate.Usually, cleaning fluid only need be used clear water, and the solution-air mixing of gas and clear water formation turbulent flow mutually can clear the pollution off effectively.Cleaning fluid adopts clear water, and the use of having saved chemical makes film can not be subjected to the corrosiveness of chemical, for having certain meaning the service life that prolongs film.In addition, the use of no chemical has reduced expense, and can not form secondary pollution.When film is seriously polluted, can adopt the chemical of debita spissitudo, reach the purpose of effective removal pollutant, low many of the chemical cleaning method that the concentration of chemical of this moment is more traditional, thus saved expense, reduced secondary pollution.Therefore, the invention provides a kind of efficient, energy-saving and environmental protection, the economic cleaning method that is applicable to doughnut gas-liquid membrane contactor device, can make membrane module after the pollution return to fully uncontaminated before the function of membrane module.
The specific embodiment
Below embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
1) clear water is heated to 20 ℃ as cleaning fluid in receiver, filters the back to set flow 4m through 5 μ m filters then
3/ hr enters the shell side of hollow fiber film assembly.Clear water is by an end of doughnut gas-liquid membrane contactor shell side and enter shell side continuously, flows out and drains from the other end of doughnut gas-liquid membrane contactor shell side, does not recycle.
2) open the 0.2MPa compressed air that compression pump makes generation, control flow velocity at 2m through pressure-regulating valve
3/ hr enters the tube side of hollow fiber film assembly.Pressed gas continous way ground in the 1 hour scavenging period that adopts enters the shell side of membrane module by the fenestra of hollow-fibre membrane.Pressed gas enters the shell side of membrane module by the fenestra of hollow-fibre membrane, forms solution-air with the cleaning fluid that flows in the shell side and mixes turbulent flow mutually, the surface of bump film.
3) after cleaning finished in 1 hour, with clear water the membrane module shell side is washed earlier, purge with dry air then, finish the cleaning process of contaminated doughnut gas-liquid membrane contactor.Carry out the oxygen removal efficiency test at last subject to the foregoing, oxygen removal efficiency returns to 80%, has promptly recovered the oxygen removal efficiency of doughnut gas-liquid membrane contactor fully.
Embodiment 2
1) clear water is heated to 20 ℃ as cleaning fluid in receiver, filters the back to set flow 2m through 5 μ m filters then
3/ hr enters the shell side of hollow fiber film assembly.Clear water is by an end of doughnut gas-liquid membrane contactor shell side and enter shell side continuously, flows out and drains from the other end of doughnut gas-liquid membrane contactor shell side, does not recycle.
2) open the 0.2MPa compressed air that compression pump makes generation, control flow velocity at 2m through pressure-regulating valve
3/ hr enters the tube side of hollow fiber film assembly.Pressed gas continous way ground in the 1 hour scavenging period that adopts enters the shell side of membrane module by the fenestra of hollow-fibre membrane.Pressed gas enters the shell side of membrane module by the fenestra of hollow-fibre membrane, forms solution-air with the cleaning fluid that flows in the shell side and mixes turbulent flow mutually, the surface of bump film.
3) after cleaning finished in 1 hour, with clear water the membrane module shell side is washed earlier, purge with dry air then, finish the cleaning process of contaminated doughnut gas-liquid membrane contactor.Carry out the oxygen removal efficiency test at last subject to the foregoing, oxygen removal efficiency returns to 78%, promptly near the oxygen removal efficiency of having recovered the doughnut gas-liquid membrane contactor.
Embodiment 3
1) clear water is heated to 20 ℃ as cleaning fluid in receiver, filters the back to set flow 4m through 5 μ m filters then
3/ hr enters the shell side of hollow fiber film assembly.Clear water by the two ends of doughnut gas-liquid membrane contactor shell side alternately enter continuously shell side (every 10 fens kinds switch first power to), flow out and drain from the other end of doughnut gas-liquid membrane contactor shell side, do not recycle.
2) open the 0.2MPa compressed air that compression pump makes generation, control flow velocity at 2m through pressure-regulating valve
3/ hr enters the tube side of hollow fiber film assembly.Pressed gas continous way ground in the 1 hour time of cleaning of adopting enters the shell side of membrane module by the fenestra of hollow-fibre membrane.Pressed gas enters the shell side of membrane module by the fenestra of hollow-fibre membrane, forms solution-air with the cleaning fluid that flows in the shell side and mixes turbulent flow mutually, the surface of bump film.
3) after cleaning finished in 1 hour, with clear water the membrane module shell side is washed earlier, purge with dry air then, finish the cleaning of the doughnut gas-liquid membrane contactor of pollution.Carry out the oxygen removal efficiency test at last subject to the foregoing, oxygen removal efficiency returns to 80%, has promptly recovered the oxygen removal efficiency of doughnut gas-liquid membrane contactor fully.
Embodiment 4
1) clear water is heated to 20 ℃ as cleaning fluid in receiver, filters the back to set flow 4m through 5 μ m filters then
3/ hr enters the shell side of hollow fiber film assembly.Clear water is by an end of doughnut gas-liquid membrane contactor shell side and enter shell side continuously, flows out and drains from the other end of doughnut gas-liquid membrane contactor shell side, does not recycle.
2) open the 0.2MPa compressed air that compression pump makes generation, control flow velocity at 2m through pressure-regulating valve
3/ hr enters the tube side of hollow fiber film assembly.Pressed gas batch (-type) ground (is 10 minutes every 10 minutes pressed gas of loading and a duration of ventilation) in 1.5 hours scavenging periods that adopt loads, and enters the shell side of membrane module by the fenestra of hollow-fibre membrane.Pressed gas enters the shell side of membrane module by the fenestra of hollow-fibre membrane, forms solution-air with the cleaning fluid that flows in the shell side and mixes turbulent flow mutually, the surface of bump film.
3) after cleaning finished in 1.5 hours, with clear water the membrane module shell side is washed earlier, purge with dry air then, finish the cleaning process of contaminated doughnut gas-liquid membrane contactor.Carry out the oxygen removal efficiency test at last subject to the foregoing, oxygen removal efficiency returns to 80%, has promptly recovered the oxygen removal efficiency of doughnut gas-liquid membrane contactor fully.
Claims (7)
1. cleaning method that is used for the doughnut gas-liquid membrane contactor, it is characterized in that, utilization is passed through liquid cleaning fluid and Compressed Gas respectively at the shell side and the tube side of gas-liquid membrane contactor, Compressed Gas enters doughnut one side, enter opposite side by fenestra, form solution-air with the cleaning fluid that flows in the opposite side and mix turbulent flow mutually, the pollutant that adheres on the membranous wall is clashed into and washes away, making it loosening breaks away from, pollutant in the fenestra is compressed gas purging and breaks away from, and along with solution-air mixing phase turbulent flow is pulled away, described cleaning method may further comprise the steps:
The first step, earlier with cleaning fluid through 5 ℃-85 ℃ of temperature controls with after filtering with setting flow 0.5m
3/ hr-20m
3/ hr enters the shell side of hollow fiber film assembly;
Second step, open the Compressed Gas that compression pump or pressure gas cylinder produce, the pressure 0.15MPa-1MPa of Compressed Gas is by pressure-regulating valve control flow velocity 0.1m
3/ hr-10m
3/ hr enters the tube side of hollow fiber film assembly, and Compressed Gas enters the shell side of membrane module by the fenestra of hollow-fibre membrane, forms solution-air with the cleaning fluid that flows in the shell side and mixes turbulent flow mutually, the surface of bump film;
The 3rd step, cleaning process back segment: with clear water membrane module tube side and shell side are washed, and purge with dry air.
2. the cleaning method that is used for the doughnut gas-liquid membrane contactor according to claim 1 is characterized in that, described cleaning fluid is clear water, acid solution, or aqueous slkali.
3. the cleaning method that is used for the doughnut gas-liquid membrane contactor according to claim 2 is characterized in that, described acid solution is a kind of in hydrochloric acid, sulfuric acid, nitric acid, the citric acid.
4. the cleaning method that is used for the doughnut gas-liquid membrane contactor according to claim 2 is characterized in that, described aqueous slkali is a kind of in NaOH, sodium carbonate, sodium metasilicate, clorox, sodium phosphate, potassium hydroxide, the calcium carbonate.
5. the cleaning method that is used for the doughnut gas-liquid membrane contactor according to claim 2 is characterized in that, in the first step, described filtration is meant that the filter through 2 μ m or 5 μ m filters.
6. the cleaning method that is used for the doughnut gas-liquid membrane contactor according to claim 1 is characterized in that, described cleaning fluid enters shell side by direction valve control from membrane contactor, or alternately enters from two ends by setup program.
7. the cleaning method that is used for the doughnut gas-liquid membrane contactor according to claim 1 is characterized in that, described Compressed Gas enters the doughnut gas-liquid membrane contactor continous way or batch (-type) in the scavenging period of setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101721572A CN101259379B (en) | 2007-12-13 | 2007-12-13 | Method for cleaning hollow fiber gas-liquid membrane contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101721572A CN101259379B (en) | 2007-12-13 | 2007-12-13 | Method for cleaning hollow fiber gas-liquid membrane contactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101259379A CN101259379A (en) | 2008-09-10 |
| CN101259379B true CN101259379B (en) | 2011-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101721572A Expired - Fee Related CN101259379B (en) | 2007-12-13 | 2007-12-13 | Method for cleaning hollow fiber gas-liquid membrane contactor |
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| CN102145257B (en) * | 2011-04-28 | 2013-02-27 | 上海交通大学 | Method for cleaning filtering membrane modules |
| CN102327741B (en) * | 2011-07-14 | 2013-07-10 | 太仓市金鹿电镀有限公司 | Method for cleaning inorganic salt precipitates on ultrafiltration membrane |
| CN103877860A (en) * | 2012-12-21 | 2014-06-25 | 中国科学院大连化学物理研究所 | Regeneration method of hollow fiber film contactor |
| CN104548947A (en) * | 2013-10-11 | 2015-04-29 | 中国石油化工股份有限公司 | On-line cleaning and drying method of hollow fiber hydrophobic membrane module |
| JP2017104832A (en) * | 2015-12-11 | 2017-06-15 | 三菱重工環境・化学エンジニアリング株式会社 | Membrane separator |
| CN105921026B (en) * | 2016-06-17 | 2018-10-26 | 苏州艾吉克膜科技有限公司 | Degassing film hydrophobicity restores technique |
| CN106390756A (en) * | 2016-11-28 | 2017-02-15 | 中国人民解放军空军勤务学院 | Cleaning method of hollow fiber membrane module |
| CN108195634A (en) * | 2017-12-11 | 2018-06-22 | 北京汽车研究总院有限公司 | VOC sampler bag aging methods |
| JP6642606B2 (en) * | 2018-03-05 | 2020-02-05 | 栗田工業株式会社 | Cleaning method for membrane separation equipment |
| CN109999674B (en) * | 2018-12-06 | 2021-09-10 | 曾杰 | Cleaning and drying process and device of filter based on microwave treatment |
| CN110026088B (en) * | 2019-04-03 | 2021-09-24 | 三达膜科技（厦门）有限公司 | Method for cleaning heavy oil polluted graphene internal support polyvinylidene fluoride hollow membrane |
| CN111871217A (en) * | 2020-06-19 | 2020-11-03 | 南京龙源环保有限公司 | PVDF ultrafiltration membrane cleaning method |
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2007
- 2007-12-13 CN CN2007101721572A patent/CN101259379B/en not_active Expired - Fee Related
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