KR20000015249A - Cleansing method for filter film of filter and cleansing system using it - Google Patents

Abstract

PURPOSE: A cleansing method for a filter and a cleansing system using it are provided to maximize the filtration effect by making the filter film maintain the permeability of an early stage and to perform the filtration process continuously without stoppage of the operation of the filter. CONSTITUTION: The cleansing system comprises: a filter film(83) formed inside a body(91); an inlet pipe(94) to flow fluid of an undiluted solution into one end part of a filtration part(80); a condensed solution outlet(92) formed on the other end of the filtration part to keep the normal flowing of the undiluted solution; a filtered solution outlet(93) formed on one side of the body to discharge the solution filtered by passing through the filter film of the filtration part; a jetting device(30) installed on one end of the inlet pipe to jet the cleansing agent; a valve(20) converted in the state the filter film is closed after filtration process; and a steam supply pipe(10) to flow the high temperature steam to the undiluted solution.

Description

An method for washing a filter of filtering equipment and a washing system using a such method washing.

The present invention relates to a method for washing a filtration membrane of a filtration device and a cleaning system using the same, and more particularly, to remove suspended impurities and effective sludge, etc. attached to the filtration membrane in the process of filtering the stock solution through the filtration device using high temperature steam. It can be removed quickly and cleanly without any cumbersome work process, and it is possible to continuously perform the filtration device using such steam, thereby maximizing the filtration effect by maintaining the initial permeability of the filtration membrane. The present invention relates to a method for cleaning a filtration membrane of a filtration device and a cleaning system using the same so that the filtration process can be continuously performed without stopping the filtration device.

In general, the filtering device used to filter the fluid of the stock solution is provided with a filter medium such as a filtration membrane or a filler to separate the incoming fluid from the foreign matter, depending on the way the filter medium is installed is largely deposited (deposit filter) And a cross filter method.

The deposition method includes a luche, a horizontal filter, a leaf filter, a filter press, a bag filter, a cartridge filter, and a sand filter depending on the position of the inflowing fluid and the position of the filter medium. It is divided into a (sand filter) method, the fluid passes through the filtration membrane or the packing material to form a foreign material layer in the direction of the stock solution of the filter medium, when a certain time elapses in this process, the fine pores formed in the filter medium by the foreign material layer Once closed, no more filtration is possible. At this time, the foreign material layer must be efficiently removed as necessary to restore the initial filtration capacity of the filter medium, and since most foreign substances are inserted into the micropores of the filter medium, most of the foreign substances are restored, and eventually the filter medium itself is replaced. There is a problem that needs to be done.

In the cross-filtering method, the fluid continuously flows between the filtration membranes, and the filtrate flows into the filtration membrane, and effective particles of the foreign substances filtered out from the stock solution are pushed out by the flow of the stock solution, so that a foreign substance layer is easily formed unlike the deposition method. However, the filterability was maintained for a considerable period of time, but this also reduced the permeability due to the concentration of foreign substances in the stock solution, and if the through-hole of the filter membrane is clogged, as well as the filter medium after a certain period of time There was a problem of rehabilitation.

In addition to the above-described filtration method, there are a cyclone method and a centrifugal separation method that do not require a filter medium. However, the cyclone method has a problem in that fine particles cannot be separated. Problems such as risks occurred.

In the filter medium used in the filtration unit such as the deposition method and the cross filter method, fillers such as sand, activated carbon, and diatomaceous earth are used, and fabricated by winding fibers such as acrylic or cotton depending on the material, or nonwoven fabric and There is a method of manufacturing a filtration membrane so that a plurality of micropores are formed on a mesh made of polyethylene cloth or made of a metal material or a heat resistant resin, etc., and used to facilitate replacement.

The filtration membrane used by winding the fibers such as acrylic or cotton in the above can not be used again once used, and must be replaced with a new one every use, resulting in problems such as high consumption cost, replacement work time, and waste generation. The filtration membrane of the woven fabric type made of nonwoven fabric, polyethylene, and polypropylene had an advantage of being able to be used more times than the filtration membrane made of the fiber material, but also hassle of having to wash the filtration membrane at every use, and thus The problem that the work process is repeated and the cost increase and the wash water required for cleaning have to be provided.

In addition, the filtration membrane used to manufacture a metal material or heat-resistant resin having a fine hole formed into a mesh shape or the like is used in recent years, and when applied to the cartridge filter method to explain in more detail, a metal material or a heat-resistant resin having fine holes formed inside the housing Filtration part is installed with a filtration membrane prepared in the form of a mesh, the upper surface is formed with a filtrate discharge pipe for discharging the filtrate, one side is formed with an inlet pipe through which liquid can be introduced, the bottom of the housing A valve capable of opening and closing is installed to discharge sludge, and the liquid introduced into the housing through the inlet pipe passes through the filtration membrane of the filtration unit, and the filtrate filtered while the foreign substances contained in the liquid are filtered out by the filtration membrane of the filtration unit. Is discharged through the filtrate outlet and the Foreign matter, such as sludge, loaded with cotton and the like is discharged by opening the valve disposed in the bottom of the housing, if necessary.

However, in the above-described method, the fibrous membrane or nonwoven fabric and the filtration membrane of the fabric type woven from polyethylene or polypropylene had the advantage that they can be used repeatedly many times, but also the foreign substances contained in the fluid during the filtration process. Since the micropores of the filtration membrane are closed, the filter membrane is separated every time it is used, and the hassle to be washed and a repetitive work process are generated accordingly. In the process of washing the filtration membrane, a separate washing water should be provided. This has led to the problem.

On the other hand, in recent years, instead of leaving the filtration membrane installed inside the filtration device as described above, a method of backwashing by supplying the washing water and the like back into the filtration device is often used, in this method, Although it was convenient compared to the method of cleaning by removing the membrane, it does not have much effect due to the problem that it requires a lot of washing materials in the process of backwashing and foreign matters caught in the micropores of the membrane cannot be separated easily. Problems have arisen.

In the filtration apparatus using the filtration membrane, when the filtration membrane is to be washed, the filtration membrane is separated and washed while the filtration apparatus is stopped. This problem does not occur.

Accordingly, the present invention has been made to solve the above-mentioned problems, and in the process of filtering the fluid through the filtration device, suspended impurities or effective sludge, etc. attached to the filtration membrane using a high-temperature steam without a cumbersome work process In order to maximize the filtration effect by maintaining the initial permeability of the filtration membrane, so that it can be removed and discharged cleanly.

In addition, by adding a cleaning agent in the process of supplying the steam, there is another object to make the filtration membrane even more clean.

In addition, another object of the present invention is to make it possible to continuously perform the filtration process while performing the above object.

1 is a schematic view of applying the present invention to a cross filter method,

2 is an embodiment of a use state according to FIG. 1,

3 is a schematic diagram applying the present invention to a cartridge filter method;

4 is an embodiment of a use state according to FIG. 3.

Explanation of Signs of Major Parts of Drawings

10: steam supply pipe 20: valve

30: injector 70: discharge valve

80: filtration unit 82: filtration membrane

90 housing 91 body

92: concentrated liquid discharge pipe 93: filtrate discharge pipe

94: inlet pipe 100: filtration device

In order to achieve the above object, the present invention provides a method for washing a filtration membrane installed inside a filtration device, wherein the filtration membrane is supplied by periodically supplying high temperature steam through the filtration device. By providing a method for washing a filtration membrane of a filtration device using steam, the above object can be achieved.

In the process of supplying the steam is added by supplying a cleaning agent.

In the process of supplying the steam characterized in that the supply of steam in the same direction as the flow of the stock solution filtered by the filtration device.

In the process of supplying the steam is characterized in that for supplying steam in a direction opposite to the flow of the stock solution filtered by the filtration device.

In addition, by installing a plurality of filtration devices for washing the filtration membrane in parallel using a high temperature steam as described above is characterized in that the washing system to perform the filtration process continuously without stopping the filtration device.

Hereinafter, preferred embodiments of the present invention will be described in detail by applying the same reference numerals to the same names by the accompanying drawings.

1 is a schematic view of the present invention applied to the cross-filtering method, the fluid of the stock solution is introduced through the inlet pipe 94 at one end of the filtration unit 80 in which the filtration membrane 82 is formed inside the body 91, and the other end. Concentrate discharge pipe 92 is formed to maintain the normal flow of the stock solution, and the filtrate discharge pipe so that the filtrate filtered through the filtration membrane 82 of the filter unit 80 is discharged on one surface of the body (91) In the cross filter type filtration device 100 which forms a 93 to filter the fluid, the steam supply pipe 10 having the injector 30 installed therein so as to inject a cleaning agent into one end of the inflow pipe 94 is formed. After the installation is switched by the valve 20 to be switched in the direction, after the filtration process is finished, the valve 20 is turned in the closed state in which the filtration membrane 82 is closed, and the high temperature steam is supplied through the steam supply pipe 10 at regular intervals. To help feed in the same direction The drawings.

In the process of supplying the high temperature steam, the cleaning agent is sprayed using the injector 30 installed in the steam supply pipe 10 as necessary to supply the high temperature steam together with the high temperature steam.

The steam supply pipe 10 may be formed on one surface of the body 91 to be installed in the filtrate discharge pipe 93 for discharging the filtrate.

2 is an embodiment of the use state according to Figure 1, by installing a plurality of filtration device 100 of the cross-filter method in parallel to wash the filtration membrane 82 with a high temperature steam as described above in a continuous filtration process It is a figure which can be performed and used.

3 is a schematic view of the present invention applied to the cartridge filter method, the upper portion of the housing 90 is provided with a filtration unit 80 is provided with a mesh filtration membrane 82 in which micropores are formed of a metal material or a heat resistant resin, etc. The filtrate discharge pipe 93 is formed to discharge the filtered filtrate, an inlet tube 94 through which the fluid of the raw liquid is introduced is formed on one side, the opening and closing can be made on the bottom of the housing 90 In the cartridge filter type filtration device 100, which is used to filter the discharge valve 70, such as a ball valve or a rotary valve is installed so as to filter, to spray the cleaning agent to one end of the filtrate discharge pipe (93) After the steam supply pipe 10 in which the device 30 is installed is installed to be switched by the valve 20 which is switched in three directions, the valve 20 is switched at a high temperature through the steam supply pipe 10 after the filtration process is finished. Symptom of It is a figure which shows supplying a group to the opposite direction from which a filtrate is discharged.

In the process of supplying the high temperature steam, the cleaning agent is sprayed using the injector 30 installed in the steam supply pipe 10 as necessary to supply the high temperature steam together with the high temperature steam.

Figure 4 is an embodiment of the use state according to Figure 3, by installing a plurality of filtration device 100 of the cartridge filter type in parallel to wash the filtration membrane 82 with a high temperature steam as described above in a continuous filtration process It is a figure which can be performed and used.

Referring to the working relationship of the present invention as described above in more detail as follows.

First, in the filtration apparatus 100 of the cross filter method, the steam supply pipe 10 installed in the inlet pipe 94 is switched using the valve 20 in a state in which the filtration membrane 82 is closed due to foreign matters after the filtration process is finished. After supplying the high-temperature steam, the high-temperature steam is supplied in the same direction as the raw liquid flows, and the micro-pores of the mesh-like filter membrane 82 formed of a metal material or a heat-resistant resin are expanded due to the high-temperature steam. By the action of the foreign matter contained in the stock solution in the filtration process is trapped in the micropores of the filtration membrane 82 is released due to the expansion of the micropores.

The foreign matters separated as described above are discharged back into the stock solution storage tank through the concentrate discharge pipe 92 or the filtrate discharge pipe 93.

In addition, in the filtration device 100 of the cartridge filter type, the filtration process is completed and the filtration membrane 82 is closed, such that the valve 20 is installed in the filtrate discharge pipe 93 as in the cross-filter type filtration device. When the steam supply pipe 10 is opened to supply high temperature steam, the high temperature steam is supplied in the opposite direction to the filtrate discharged to be filtered and then supplied to the filtration membrane 82 of the filtration unit 80, thereby providing metal or heat resistance. As the micropores of the filtration membrane 82 formed of a resin or the like are expanded, foreign matters trapped in the micropores of the filtration membrane 82 are separated from the filtration process by the action of vapor pressure.

As described above, foreign matters separated from the filtration membrane 82 of the filtration unit 80 are discharged to the outside by opening the discharge valve 70 formed at the bottom of the housing 90 to complete the cleaning process of the filtration membrane 82. It is done.

On the other hand, the fine oil attached to the filtration membrane 82 in the process of removing foreign matters caught on the filtration membrane 82 by supplying the high-temperature steam as described above in the cross-filter method or the cartridge filter filtration device 100. In order to remove inorganic impurities, the cleaning agent, which is a compound component having excellent resolution with respect to organic and inorganic impurities contained in the stock solution, is supplied to the high-temperature steam through the injection device 30 installed in the steam supply pipe 10, It is possible to remove the fine organic and inorganic impurities attached to the filtration membrane 82 to have a condition that can further clean the filtration membrane 82.

The injection device 30 installed in the steam supply pipe 10 should have a temperature control capability, and the injection method is the steam of steam supplied by the air injection or the pressure injection by a high pressure feeding pump while the nozzle is divided. Injection through the ejector is preferred.

The cleaning agent added in the process of supplying steam may include phosphate, anionic or nonionic surfactant, ethylene diamine tetraacetic acetylacetic acid (EDTA), oxalic acid, citric acid, acetic acid, formic acid, caustic soda or mutually high promoting effect. Preference is given to using the composition.

On the other hand, in the case of using a plurality of filtration device 100 for washing the filtration membrane 82 by using a steam as described above in parallel as shown in Figure 2 or 3 used in the plurality of filtration device 100 One filtration device 100 that does not perform the filtration process because the filtration membrane 82 is closed due to the foreign matter in the process of performing the washing process using steam as described above, the other filtration device 100 and the like By continuing to perform the filtration process to eliminate the hassle of stopping the operation of the filtration device in the conventional washing, as well as performing the filtration process continuously, it is possible to filter more and more of the stock solution.

In addition, the washing procedure of the filtration device 100 in the process of performing the filtration process is installed in parallel, after installing an automatic valve, a sensor, etc. in the filtration device 100, at one side by a control program commonly used Of course, it can proceed sequentially, as well as the method of proceeding the washing from one filtration device 100, the first filtration membrane 82 is closed if necessary, or to wash the filtration membrane 82 of one or more filtration apparatus 100 While the rest can be used in parallel to allow the filtration process to proceed.

As described above, the present invention has been described with reference to one embodiment shown in the drawings, but this is merely exemplary, and various modifications and equivalent other embodiments may be made by those skilled in the art. Will understand.

As described above, according to the present invention, after the filtration process is finished in the process of filtering the fluid of the stock solution using the filtration device, the filtration membrane is closed, or in the filtration process, the filtration membrane is filtered, By supplying the steam and the cleaning agent to be removed, it is a desirable invention that can quickly and cleanly wash the filtration membrane without cumbersome work process, and thus can maximize the filtration effect.

In addition, it is possible to connect and install a plurality of filtration devices used to wash the filtration membrane in parallel using the high temperature steam as described above, without interrupting the operation of the filtration device, and performs the normal filtration process continuously It is a useful invention that can be filtered more of the stock solution.

Claims (6)

In the method of washing the filtration membrane of the filtration unit installed inside the filtration apparatus, the high-temperature steam is periodically supplied through the filtration apparatus 100 to clean the filtration membrane 82 of the filtration unit 80. Filtration membrane cleaning method of a filtration device, characterized in that. The filtration membrane cleaning method of claim 1, wherein the steam is supplied with a cleaning agent attached thereto. The method according to claim 1 or 2, wherein the steam is supplied in the same direction as the flow of the stock solution filtered by the filtering device (100) in the process of supplying the steam. The method according to claim 1 or 2, wherein the steam is supplied in a direction opposite to the flow of the stock solution filtered by the filtering device (100) in the process of supplying the steam. When a plurality of filtration devices 100 for washing the filtration membrane 82 using parallel steam are installed in parallel so that one filtration device 100 performs the washing process, the other filtration device 100 continues to filter. Filtration membrane cleaning system of the filtration device to perform the process to perform a continuous filtration process. The filtration membrane cleaning system according to claim 5, wherein the at least one filtration device (100) performs a filtration process while the filtration process is performed while the other filtration device continuously performs the filtration process.