CN104437098A - Forward material-feeding and reverse-cleaning membrane system - Google Patents
Forward material-feeding and reverse-cleaning membrane system Download PDFInfo
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- CN104437098A CN104437098A CN201410717073.2A CN201410717073A CN104437098A CN 104437098 A CN104437098 A CN 104437098A CN 201410717073 A CN201410717073 A CN 201410717073A CN 104437098 A CN104437098 A CN 104437098A
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Abstract
The invention discloses a forward material-feeding and reverse-cleaning membrane system. The forward material-feeding and reverse-cleaning membrane system mainly comprises N-stage series-connection membrane stacks arranged from front to back, wherein N is more than 1; the N-stage series-connection membrane stacks are connected by a common pipe; a material (water) is gradually and continuously filtered when entering the forward material-feeding and reverse-cleaning membrane system system; the reverse cleaning comprises two levels, firstly, forward filtering and reverse cleaning can be realized among membrane modules, the cleaning modules including a cleaning pump and a cleaning tank are distributed behind the Nth membrane stack, and cleaning fluid can realize reverse cleaning among the membrane modules from back to front during cleaning; secondly, cleaning fluid flowing in a direction opposite to that of the fluid in a filtering state is realized in each membrane module. The flowing direction of the fluid in material feeding is opposite to that of the fluid in cleaning, the membrane cleaning efficiency is improved, the service life of a membrane core is prolonged, the cleaning energy consumption and the cleaning water amount are reduced, and the high-efficiency, energy-saving and environment-friendly purposes can be achieved.
Description
Technical field
The present invention discloses a kind of forward and walks to expect reverse cleaning membrane system, divides belong to membrane for water treatment piece-rate system technical field by International Patent Classification (IPC) (IPC).
Background technology
In membranous system installation, often from front to back, feed liquid passes through the membrane stack of front and back successively in membrane stack arrangement, and flow out from afterbody membrane stack discharging opening, in the course of work, along with the flow direction of liquid, film surface can form concentration polarization, i.e. the pollution layer of film.Conventional membranous system is when cleaning, and cleaning fluid flow direction is consistent with walking direction of flow, and namely washing and cleaning operation is with when walking to expect, is all enter from the feed end of membranous system, flows out, there will be two problems like this from the other end:
1, for membranous system, from front to back, polluting also is from gently to heavy, and in cleaning process, the concentration of cleaning fluid is then from thick to thin, thus causes cleaning thorough in membrane stack arrangement, greatly reduces film core service life;
2, for conventional membranous system, the direction that membrane component pollutes is consistent with the direction of cleaning, and cleaning efficiency reduces, and effect is bad.
China document CN1311055 discloses a kind of membrane separating method of two-way operation, mainly be applicable to hollow-fibre membrane, membrane module often works after certain hour, utilize the converting system of design, make the feed liquid reverse flow in membrane module, UF membrane and cleaning are carried out, and permeate flows to constant simultaneously, the cleaning of aforementioned films assembly utilizes feed liquid reverse flow, needs timing to change the flow direction during work; China document CN95103432.4 disclose a kind of method improving separation efficiency of ultra-filteration diaphragm, specifically in the flow process of hollow fiber filter membrane separation or condensed matter, sets up one can be carried out back flush reverse purging system to face; China document CN201310250776.4 discloses a kind of reverse-osmosis membrane element off-line cleaning method, the method can to reverse-osmosis membrane element by big yield cleaning, reversely to wash, the operation such as forward is washed, immersion, multi-angle, multi-level off-line strengthen cleaning single reverse-osmosis membrane element.But, do not relate to walking material and cleaning in reverse membranous system tandem membrane stack in aforementioned each document, therefore, just have proposition of the present invention.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of forward and walk to expect reverse cleaning membrane system, improve Membrane cleaning efficiency, extend film core service life, reduce cleaning energy consumption and the cleaning water yield, thus reach object that is efficient, energy-saving and environmental protection.
For achieving the above object, the present invention is achieved by the following technical solutions:
A kind of forward walks to expect reverse cleaning membrane system, and it comprises the series connection of N level membrane stack, wherein N >=1 that arrange from front to back, and described each membrane stack is formed by connecting by a common pipe:
Material through relay filtration step by step, enters first order membrane stack, second level membrane stack successively after entering membranous system ... N level membrane stack deutostoma concentrate flows out;
Washing and cleaning operation adopts reverse cleaning, and it comprises two levels: first level realizes the reverse cleaning of forward filter between membrane stack group at different levels; Second level realizes the cleaning fluid flowing contrary with filtration condition in each membrane stack group inside, and cleaning fluid enters from N membrane stack group discharging opening and flows out from charging aperture, and flows into N-1 level membrane stack.
Further, after N level membrane stack, arrange cleaning module, this cleaning module comprises scavenging pump and purge tank, and during cleaning, first cleaning fluid flows into N level membrane stack, N-1 level membrane stack ... 1st grade of membrane stack cleans, and achieves the reverse cleaning between film group.
Further, in described M membrane stack group, the implementation of reverse cleaning is realized by the circulating pump of M+1 group, by a short tube, the circulating pump of M+1 group is connected with the discharging pipeline of M group, and M group feeding pipe is connected with common pipe, skip the circulating pump of M group, and switch valve being set accordingly, wherein M < N, in M membrane stack group herein, reverse cleaning essence is reverse cleaning in each membrane stack group.
Further, the membrane stack that described membranous system adopts is rolled membrane module, the feed pipe of membrane stack at different levels is provided with circulating pump and transfer valve, discharge pipe is provided with transfer valve, the discharge pipe of afterbody membrane stack is provided with circulating pump and transfer valve, and CIP purge tank and scavenging pump is provided with after this group membrane stack, purge tank is connected to the discharge pipe of afterbody membrane stack by scavenging pump and common pipe, and membrane stack at different levels makes cleaning fluid enter into the cleaning of previous stage membrane stack by the transfer valve of circulating pump and cooperation.
Further, each dialysis mouth of described membrane stack also connects rear outflow, and the pipeline of membrane stack dislysate at different levels is provided with feed liquid valve V16 and cleaning valve V17, and when membrane stack feed liquid walks material or cleaning, two valves are alternately opened, and wherein membrane stack cleaning dislysate turns back to purge tank through valve V17.
Further, described membranous system feed end is provided with security personnel's pump and charging main valve V1, and feed liquid concentrate after UF membrane flows out through valve V18.
Further, the pipe blow-through of described purge tank is provided with after scavenging pump cleaning main valve V15.
Difference between the present invention and existing scheme on function and structure:
Conventional clean is, forward walks material, and forward cleans, and during because walking to expect, film more sternward, pollutes more serious, more not easy cleaning, and after forward cleaning, what cleaning performance is poor, causes fouling membrane more below more serious.
Cleaning program of the present invention, forward walks material, reverse cleaning, and film inside be also reverse cleaning, and during cleaning, it is denseer just to have started cleaning agent, and the most serious film core is polluted in cleaning, can greatly improve Membrane cleaning effect, raising film service life.
The present invention discloses a kind of forward and walks to expect reverse cleaning membrane system, membranous system composition mainly comprises N level series connection membrane stack (N >=1) arranged from front to back, coupled together by a common pipe, material (water) filters through relay step by step after entering membranous system; In the present invention, said reverse cleaning comprises two levels: first level is between film group, realize the reverse cleaning of forward filter, cleaning module (scavenging pump and purge tank) is arranged in after N level membrane stack by the present invention, and during cleaning, cleaning fluid achieves the reverse cleaning between film group from back to front; Second level realizes the cleaning fluid flowing contrary with filtration condition in each film group inside.When work of the present invention is walked to expect, when liquid flow direction and cleaning, liquid flow direction is contrary, improves Membrane cleaning efficiency, extends film core service life, reduces cleaning energy consumption and the cleaning water yield, thus reach object that is efficient, energy-saving and environmental protection.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention.
Fig. 2 is the present invention and existing cleaning membrane system comparison diagram.
Fig. 3 is the present invention and existing cleaning membrane system film interior contrast figure.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described:
Embodiment: the film separation system for feed separation (purifying or concentrated) or water filtration generally applied in the market is the film separation system adopting multistage (group) series arrangement.Membranous system composition mainly comprises N level series connection membrane stack (N >=1) arranged from front to back, is coupled together by a common pipe.Material (water) through relay filtration step by step, enters first order membrane stack, second level membrane stack successively after entering membranous system ... N level membrane stack deutostoma concentrate flows out.
The open one of the present invention can realize the Using Multistage Membranes piece-rate system of forward filter and reverse cleaning (regeneration).In the present invention, said reverse cleaning comprises two levels.
First level is between film group, realize the reverse cleaning of forward filter.The cleaning module (scavenging pump and purge tank) of general film separation system is arranged in before first order membrane stack, and identical with during filtration during cleaning, first cleaning fluid is introduced into first order membrane stack, then successively enters follow-up membrane stack.Cleaning module (scavenging pump and purge tank) is arranged in after N level membrane stack by this patent.During cleaning, first cleaning fluid flows into N level membrane stack, N-1 level membrane stack ... 1st grade of membrane stack cleans.Achieve the reverse cleaning between film group.
Second level realizes the cleaning fluid flowing contrary with filtration condition in each film group inside, and cleaning fluid enters from N membrane stack discharging opening and flows out from charging aperture, and flows into N-1 level membrane stack.The mode realizing the reverse flow of membrane stack cleaning liquid inside in the present invention is not realize by increasing a set of reverse pipeline in membrane stack, and such implementation pattern structure is too complicated, and due to complex structure fluid resistance very large.In this patent, in M membrane stack group, the implementation of reverse cleaning is realized by the circulating pump of M+1 group, by a short tube, the circulating pump of M+1 group is connected with the discharging pipeline of M group, and M group feeding pipe is connected with common pipe, skip the circulating pump of M group, and switch valve is set accordingly, wherein M < N, in M membrane stack group herein, reverse cleaning essence is reverse cleaning in each membrane stack group.The advantage of this implementation is that pipeline structure is relatively simple, and fluid resistance is little, but needs an extra increase scavenging pump.
In the present invention, M, N are all natural numbers.
When work of the present invention is walked to expect, when liquid flow direction and cleaning, liquid flow direction is contrary, improves Membrane cleaning efficiency, extends film core service life, reduces cleaning energy consumption and the cleaning water yield, thus reach object that is efficient, energy-saving and environmental protection.
Refer to Fig. 1, a kind of forward walks to expect reverse cleaning membrane system, comprise the N level membrane stack arranged from front to back, wherein N > 1, when walking to expect, feed liquid forward flow enters first order membrane stack, second level membrane stack successively ... N level membrane stack deutostoma concentrate flows out, and the dialysis mouth of each membrane stack also connects rear outflow, and the feed liquid of each membrane stack is all enter membrane stack from charging aperture to flow out from discharging opening and enter next stage membrane stack; During cleaning, cleaning fluid reverse flow enters N level membrane stack, N-1 level membrane stack ... 1st grade of membrane stack cleans, and the cleaning fluid of each membrane stack enters from membrane stack discharging opening to enter previous stage membrane stack from charging aperture outflow, and cleaning dialysis and concentrate return purge tank; The membrane stack that membranous system adopts is rolled membrane module, and membrane separating process can be ultrafiltration, nanofiltration, also can be micro-filtration.The feed pipe of first order membrane stack is provided with circulating pump P002, transfer valve V3, V4, and the discharge pipe of first order membrane stack is provided with transfer valve V5, V6, and the feed pipe of membrane stack at different levels is provided with circulating pump and transfer valve, discharge pipe is provided with transfer valve; The discharge pipe of afterbody membrane stack is provided with circulating pump P004 and transfer valve V11.V12, CIP purge tank is provided with after last membrane stack, purge tank is connected to the discharge pipe of afterbody membrane stack by scavenging pump P006 and common pipe, and membrane stack at different levels makes cleaning fluid enter into the cleaning of previous stage membrane stack by the transfer valve of circulating pump and cooperation.The pipeline of membrane stack dislysate at different levels is provided with feed liquid valve V16 and cleaning valve V17, and when membrane stack feed liquid is walked material or cleans, two valves are alternately opened, and wherein membrane stack cleaning dislysate turns back to CIP purge tank through valve V17.Described membrane stack feed end is provided with security personnel pump P001 and charging main valve V1, and feed liquid concentrate after UF membrane flows out through valve V18.The pipe blow-through of CIP purge tank is provided with cleaning main valve V15 after scavenging pump.By return duct, the cleaning fluid of each for reverse cleaning membrane stack is turned back to purge tank in the intermediate node of feed end and first order membrane stack entrance, mounted valve V2 on the return line.
Operation principle of the present invention is as follows:
When walking to expect, turn on pump P001, P002, P003, P004, valve V1, V4, V5, V7, V9, V11, V13, V18, other valve closing, feed liquid forward flow, permeate flows out from V16, and concentrate flows out from V18.
During cleaning, turn on pump P006, P005, P004, P003, P002, other valve closing of valve opening V2, V3, V6, V8, V10, V12, V14, V15, V17, after cleaning fluid enters pump P006 from CIP purge tank, reverse enter membrane stack clean, cleaning dialysis and concentrate return purge tank.
For membranous system, membrane stack arrangement from front to back, polluting also is from light to heavy, as shown in Figure 2, in cleaning process, existing membranous system forward walks to expect that forward cleans, the concentration of cleaning fluid is then from thick to thin, and the cleaning fluid that concentration is high first carries out the light membrane component polluted, and easily causes overclean and damages film core, and the low cleaning fluid of concentration finally just cleans the membrane component of heavily contaminated, obviously cleaning is not thorough; The present invention then forward walks material, reverse cleaning, solves cleaning fluid and pollutes reverse matching problem.
As shown in Figure 3, for existing conventional membranous system, the direction of membrane component internal contamination is consistent with the direction of cleaning, and cleaning efficiency reduces, and effect is bad.Forward clean fish scale like fish scale can not be impacted, and reverse cleaning of the present invention is the same with regard to likely starting fish scale, greatly can improve cleaning efficiency.
The present invention can improve Membrane cleaning efficiency, extends film core service life, reduces cleaning energy consumption and the cleaning water yield, thus reach object that is efficient, energy-saving and environmental protection.
In the present invention, membrane stack industry is interior also referred to as film group or membrane stack group.When work of the present invention is walked to expect, when liquid flow direction and cleaning, liquid flow direction is contrary, following arrow signal.
Liquid flow direction during ← work cleaning
Liquid flow direction when → work is walked to expect
Above, be only the embodiment utilizing this origination techniques content, the modification that any those skilled in the art use this creation to do, change, all belong to the scope of the claims that this creation is advocated, and be not limited to those disclosed embodiments.
Claims (7)
1. forward walks to expect a reverse cleaning membrane system, it is characterized in that: comprise the series connection of N level membrane stack, wherein N >=1 that arrange from front to back, described each membrane stack is formed by connecting by a common pipe:
Material through relay filtration step by step, enters first order membrane stack, second level membrane stack successively after entering membranous system ... N level membrane stack deutostoma concentrate flows out;
Washing and cleaning operation adopts reverse cleaning, and it comprises two levels: first level realizes the reverse cleaning of forward filter between membrane stack group at different levels; Second level realizes the cleaning fluid flowing contrary with filtration condition in each membrane stack group inside, and cleaning fluid enters from N membrane stack group discharging opening and flows out from charging aperture, and flows into N-1 level membrane stack.
2. forward according to claim 1 walks to expect reverse cleaning membrane system, it is characterized in that: after N level membrane stack, arrange cleaning module, this cleaning module comprises scavenging pump and purge tank, during cleaning, first cleaning fluid flows into N level membrane stack, N-1 level membrane stack ... 1st grade of membrane stack cleans, and achieves the reverse cleaning between film group.
3. forward according to claim 1 walks to expect reverse cleaning membrane system, it is characterized in that: in described M membrane stack group, the implementation of reverse cleaning is realized by the circulating pump of M+1 group, by a short tube, the circulating pump of M+1 group is connected with the discharging pipeline of M group, and M group feeding pipe is connected with common pipe, skip the circulating pump of M group, and switch valve is set accordingly, wherein M < N.
4. forward according to claim 1 walks to expect reverse cleaning membrane system, it is characterized in that: the membrane stack that described membranous system adopts is rolled membrane module, the feed pipe of membrane stack at different levels is provided with circulating pump and transfer valve, discharge pipe is provided with transfer valve, the discharge pipe of afterbody membrane stack is provided with circulating pump and transfer valve, and CIP purge tank and scavenging pump is provided with after this group membrane stack, purge tank is connected to the discharge pipe of afterbody membrane stack by scavenging pump and common pipe, and membrane stack at different levels makes cleaning fluid enter into the cleaning of previous stage membrane stack by the transfer valve of circulating pump and cooperation.
5. forward according to claim 1 and 2 walks to expect reverse cleaning membrane system, it is characterized in that: each dialysis mouth of described membrane stack also connects rear outflow, the pipeline of membrane stack dislysate at different levels is provided with feed liquid valve V16 and cleaning valve V17, when membrane stack feed liquid is walked material or cleans, two valves are alternately opened, and wherein membrane stack cleaning dislysate turns back to purge tank through valve V17.
6. forward according to claim 1 walks to expect reverse cleaning membrane system, it is characterized in that: described membranous system feed end is provided with security personnel's pump and charging main valve V1, and feed liquid concentrate after UF membrane flows out through valve V18.
7. walk to expect reverse cleaning membrane system according to the forward one of claim 2 to 6 Suo Shu, it is characterized in that: the pipe blow-through of described purge tank is provided with after scavenging pump cleaning main valve V15.
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| CN107176708A (en) * | 2017-07-07 | 2017-09-19 | 蓝涛环保科技（南京）有限公司 | A kind of method that cellulose ether residue is separated in the production waste water from cellulose ether |
| CN107469623A (en) * | 2017-09-25 | 2017-12-15 | 厦门市天泉鑫膜科技股份有限公司 | A kind of multifunctional membrane separates pilot experiment equipment |
| CN109133112A (en) * | 2018-10-30 | 2019-01-04 | 安徽峰可达科技股份有限公司 | A kind of technique and device of organic tubular membrane refined brine |
| CN111888942A (en) * | 2020-06-10 | 2020-11-06 | 北京首钢朗泽新能源科技有限公司 | Membrane cleaning system |
| CN113929193A (en) * | 2020-06-29 | 2022-01-14 | 佛山市顺德区美的饮水机制造有限公司 | Water purification structure and water purification unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113929193A (en) * | 2020-06-29 | 2022-01-14 | 佛山市顺德区美的饮水机制造有限公司 | Water purification structure and water purification unit |
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