JPH07289818A - Filter element and filter device - Google Patents

Abstract

PURPOSE:To efficiently filter, even though a filtering surface of a filter element is exposed when a water level of a raw liquid in a tank falls. CONSTITUTION:The filter element 2 is composed of an extraction pipe 22 suspended by passing through mounting metal fittings 21 and a filtering member 23 fixed to the mounting metal fittings 21 by surrounding the circumference of the extraction pipe 22 with a spacing from the extraction pipe 22 at the outside of the extraction pipe 22. The mounting metal fittings 21 are fixed to a partitioning plate 3 in the tank of a filtering device, and the upper end of the filtering member 23 is closed with the mounting metal fittings 21. The raw liquid is stored in the lower part than the partitioning plate 3 and it is filtered with the filtering member 23 and then passes through a hollow part from the lower end of the extraction pipe 22 and reaches the upper part of the partitioning plate 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtering device used for filtering beer and the like.

[0002]

2. Description of the Related Art Conventionally, as a filtering device used for filtering beer and the like, one shown in FIG. 3 is known. FIG. 3 shows an element suspension type filtering device 101, which has an upper tank 101a and a lower tank 101b which are partitioned by a partition plate 103 and hermetically sealed from each other.
On the partition plate 103, a plurality of cylindrical cylindrical filtration elements 102, each of which has a closed lower end, are suspended.

The undiluted solution is pumped by the pump 110 to the lower tank 1.
01b, is filtered through the hollow portion of each filter element 102, and then collected in the upper tank 101a.
The filtered liquid that has been filtered and collected in the upper tank 101a is
It is sent to a filtrate storage tank (not shown). The surface of each filter element 102 is pre-coated with a filter aid, which prevents clogging of each filter element 102 and maintains stable filterability.

By the way, even if a filter aid is pre-coated on the surface of the filter element 102 in order to maintain a stable filter capacity, if a large amount of filtered material adheres and accumulates on the surface of the filter element 102, the filter capacity will be deteriorated. Therefore, it is necessary to remove the filtered matter accumulated on the surface of the filtration element 102 by washing, if necessary. In that case, the filtering operation is temporarily stopped, the stock solution remaining in the lower tank 101b is disposed of, and then each filtering element 102 is washed.

Regarding the treatment of the undiluted solution remaining in the lower tank 101b, it is conceivable that the entire undiluted solution is recovered from the lower tank 101b and then filtered again. However,
The filtered material deposited on the surface of the filtration element 102 is only attached to the surface of the filtration element 102 due to the pressure difference caused by the flow of the liquid from the undiluted liquid side (primary side) to the filtration side (secondary side), and thus is collected. At some times, there is a risk that the filtered material (including the filter aid) deposited on the surface of the filter element 102 will fall off the filter element 102 and be mixed in the stock solution. Also, for example, when filtering beer,
Even if the same beer is produced in different varieties in the same process, it is not possible to return to the previous process and perform filtration again, so that it is not possible to recover the remaining undiluted solution when the varieties are switched.

Therefore, conventionally, water is gently poured from the lower part of the lower tank 101b to collect the undiluted solution such as beer and the water as much as possible and collect the undiluted solution on the secondary side (hereinafter, "water pushing"). In order to process the stock solution while maintaining the pressure difference between the primary side and the secondary side, pressurized gas such as pressurized air or carbon dioxide gas is supplied to the lower tank 101b, and at that pressure. The remaining stock solution was filtered and collected.

[0007]

However, in the case of water pushing, no matter how quietly water is injected, water is mixed in the stock solution, and as a result, the filtrate diluted with water is recovered. However, the collected filtrate cannot be used as a product. In addition, when pressurized gas is supplied to the lower tank to process the remaining undiluted solution, when the water level of the undiluted solution drops during filtration and the filtration surface of the filtration element is exposed, the pressurized gas is filtered through the exposed surface of the filtration element. Since it is supplied to the side (secondary side) and further filtration cannot be performed, there is a problem that most of the remaining undiluted solution is wasted. To reduce the waste of the remaining stock solution,
The pressure of the pressurized gas may be as small as 0.1 to 0.2 kgf / cm ² or less, but this takes time for filtration and is not efficient.

[0008] Therefore, an object of the present invention is to provide a filter element and a filter device that can perform filtration efficiently even when the level of the stock solution in the tank is lowered and the filter surface of the filter element is exposed.

[0009]

In order to achieve the above object, the filtration element of the present invention is a cylindrical filtration element that is hung in a tank of a filtration device and a filtrate is obtained from an upper end of the filtration element. For filtering, a cylindrical filtering member having a closed lower end and a mounting member blocking the upper end of the filtering member are passed through and suspended from the mounting member, and the filtering is performed with a space from the inner surface of the filtering member. And a tube member provided inside the member.

The filtration device of the present invention is a tank to which a stock solution before filtration is supplied, and a filter solution suspended from the tank for filtering the stock solution, and the filtrate obtained from the upper end is sent out of the tank. In a filtering device having a tubular filter element and a pressurized gas introducing means for introducing a pressurized gas into the tank, the filter element includes a tubular filter member having a closed lower end, and the filter member. A pipe member penetrating the upper end of the filter member and hung from the mount member so as to be spaced from the inner surface of the filter member and provided inside the filter member.

Further, the tank is divided into an upper tank and a lower tank by a partition wall, the mounting member is fixed to the partition wall, the upper end of the pipe member is opened to the upper tank, and the pressurized gas is The introducing means may be connected to the lower tank.

[0012]

In the filter element of the present invention constructed as described above, since the pipe member is provided inside the filter member for filtering the stock solution, the stock solution in the tank is filtered by the filter member and the lower end of the pipe member is filtered. Through the hollow part to the upper end,
It is delivered to the outside of the filter element. Therefore, even if the water level in the tank is lowered and the filter member is exposed, it is possible to perform filtration until the water level in the tank reaches the lower end of the pipe member.

Since the filtering device of the present invention has the filtering element in which the tube member is provided inside the filtering member, the pressurized gas is introduced into the tank by the pressurized gas introducing means, and the tank is heated at the pressure of the pressurized gas. Even when the undiluted solution inside is filtered, as described above, it is possible to filter until the water level in the tank reaches the lower end of the pipe member. At this time, the pressure of the pressurized gas may be increased, and efficient filtration can be performed. Further, when cleaning the filtration element or switching the type of stock solution, it is necessary to collect the stock solution in the tank. At this time, if the stock solution in the tank is collected using the pressure of the pressurized gas, the stock solution is wasted. Less.

[0014]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of a filtration system using an embodiment of the filtration device of the present invention, and FIG. 2 is a sectional view of a filtration element of the filtration device shown in FIG.

As shown in FIG. 1, the filtration device 1 of the present embodiment.
Is an element suspension type filtration device 1 having an upper tank 1a and a lower tank 1b, which are partitioned by a partition plate 3 as a partition wall and sealed to each other. Upper tank 1
a and the lower tank 1b have the same structure as shown in FIG.
It is fixed with bolts and nuts. Further, although the partition plate 3 is provided with a plurality of filtration elements 2,
This structure will be described later.

A valve 11c is provided at the lower end of the lower tank 1b.
The undiluted solution supply pipe 4 is connected via. The undiluted solution supply pipe 4 is provided with a pump 10 and valves 11a, 1
Stock solution tank (not shown) by switching 1b
The undiluted solution stored in 1 or the precoat solution stored in the precoat tank 9 is supplied to the lower tank 1b. The precoat liquid contains a filter aid which is precoated on the surface of each filter element 2 prior to the filtration of the stock solution, and diatomaceous earth, perlite, cellulose or the like is used as the filter remover. Further, a discharge pipe 6 provided with a valve 11d is connected between the valve 11c and the pump 10 in order to discharge the undiluted solution which could not be recovered when the filtration element 2 was washed. Further, a gas introducing pipe 7 as a pressurized gas introducing means for introducing a pressurized gas such as pressurized air or carbon dioxide into the lower tank 1b is connected to the upper portion of the lower tank 1b. The pipe 11 is provided with a valve 11f.

On the other hand, a delivery pipe 5 for delivering the filtered filtrate to a filtrate storage tank (not shown) is connected to the upper tank 1a. The delivery pipe 5 is provided with a valve 11h, and the filtrate is delivered to the filtrate storage tank via the valve 11h. The delivery pipe 5 is preferably provided on the bottom surface of the upper tank 1a, that is, near the depth position where the partition plate 3 is provided. This is to allow the filtrate that has been filtered and reached the upper tank 1a during the recovery of the stock solution to be sent to the filtrate storage tank as much as possible. The most preferable form is to provide a delivery means for connecting the upper end of the delivery pipe 22 and the delivery pipe 5 shown in FIG.

The precoat liquid return pipe 8 is used for the filtration device 1.
Is for returning the precoat liquid supplied to the precoat tank 9 to the precoat tank 9 via the valve 11j.

The structure of the filter element 2 will be described with reference to FIG. As shown in FIG. 2, the filter element 2 of the present embodiment forms an outlet pipe 22 as a pipe member penetrating a fitting 21 as an attachment member and a flow path outside the outlet pipe 22. And a filter member 23 that is fixed to the mounting member 21 so as to surround the outlet pipe 22 at a distance so that the mounting member 21 fits into the hole formed in the partition plate 3. The filter element 2 is attached to the partition plate 3 by fitting or screwing. As a result, the upper end of the filter member 23 is closed by the mounting member 21, and the upper end of the spout pipe 22 is open in the upper tank 1a.

As shown in FIG. 2, the lower end of the filter member 23 is integrally closed with the same material (ceramics or sintered metal) that constitutes the side wall of the filter member 23, and the lower end also functions as a filter. However, the lower end of the filter member 23 may be closed with a material different from that of the side wall of the filter member 23.

The spout tube 22 may be fixed to the mounting member 21 by being fitted or screwed to the mounting member 21, or may be integrated with the mounting member 21. Also, the filter member 23 may be fixed to the mounting member 21 by fitting or screw fixing to the lower end of the mounting member 21, or may be fixed by adhesion.

As the filter member 23, a ceramic cylindrical filter was used in the present embodiment, but a porous cylindrical cylindrical filter made of sintered metal or a wire wound around the cylindrical body in a coil shape is used. You may use the wire-wound type filter which filters by a clearance gap. The porous filter made of ceramics or sintered metal and the winding type filter may be known filters that have been used conventionally, and therefore detailed description thereof will be omitted.

As the material of the filter member 23, a filter made of a porous body made of ceramics or sintered metal or a wire-wound type filter can be used as described above. For example, soy sauce or the like has a high salt content. When filtering the undiluted solution, it is better to use a ceramics filter because there is a risk of corrosion if a metal filter is used. Further, in the case of filtering sake, if a metal material containing iron is used, the iron content will be dissolved in sake, so in such a case, it is better to use a ceramic filter.

Next, the operation of the filtration system of this embodiment will be described.

First, the precoating performed prior to the filtration of the stock solution will be described. At the time of pre-coating, the valves 11b, 11c, 11j are opened, and the pre-coat liquid in the pre-coat tank 9 is circulated through the stock solution supply pipe 4, the filtering device 1, the pre-coat solution return pipe 8 and the pre-coat tank 9. As a result, a precoat layer is formed on the surface of each filter element 2.

Next, the filtering operation will be described. When the valves 11a, 11c, 11h are opened and the pump 10 is driven, the stock solution in the stock solution tank is supplied to the lower tank 1b through the stock solution supply pipe 4. The stock solution supplied to the lower tank 1b passes through the filter member 23 of each filter element 2 to be filtered, further passes through the hollow portion from the lower end of the spout pipe 22 to the upper end, and is collected in the upper tank 1a. The filtrate that has been filtered and collected in the upper tank 1a is delivered to a filtrate storage tank (not shown) through the delivery pipe 5.

If filtration is carried out for a long time, the filtration element 2
Filtrate adheres to and deposits on the surface of the. If the filtered material is deposited on the surface of the filtering element 2, the filtering ability is deteriorated.
If necessary, the filtration element 2 is washed. At this time, in order to prevent the filtered material accumulated on the surface of the filtration element 2 from falling off into the undiluted solution, the lower tank 1b is maintained while maintaining the pressure difference between the undiluted solution side (primary side) and the filtered solution side (secondary side). Perform the process to remove the stock solution from. The operation of this stock solution treatment will be described below.

At the time of processing the stock solution, the valves 11a and 11c are closed and the valve 11f of the gas introduction pipe 7 is opened.
As a result, pressurized gas is introduced into the lower tank 1b,
Due to the pressure of the pressurized gas, the stock solution in the lower tank 1b is filtered through the filter element 2 and collected in the upper tank 1a. That is, the stock solution remaining in the lower tank 1b is filtered by the pressure of the pressurized gas and collected in the filtrate storage tank.

At this time, even if the water level of the undiluted solution in the lower tank 1b is lowered and the filtering member 23 is exposed, since the pouring pipe 22 is provided inside the filtering member 23, the pressurized gas is not supplied to the upper tank. It will not be supplied to the 1a side. Therefore, the undiluted solution can be collected while being filtered until the water level of the undiluted solution reaches the lower end of the spout pipe 22, and the waste of the undiluted solution is reduced. Further, since it is not necessary to reduce the pressure of the pressurized gas, the efficiency of stock solution treatment does not decrease. The remaining stock solution is discharged from the discharge pipe 6 by opening the valves 11c and 11d.

The amount of the stock solution that remains in the lower tank 1b without being collected depends on the position of the lower end of the spout pipe 22 with respect to the lower tank 1b. Therefore, in order to collect a larger amount of the undiluted solution, it is preferable to extend the lower end of the spout pipe 22 as close as possible to the lower end of the filtration member 23, and further arrange the lower end of the filtration element 2 near the bottom surface of the lower tank 1b. Is more preferable.

After treating the undiluted solution of the filtering device 1 in this way, the washing water is made to flow back to the filtering device 1 from the delivery pipe 5 to wash off the filtered material accumulated on the surface of each filtering element 2 and discharge it from the discharging pipe 6. To do. Since the precoat layer of the filtration element 2 is also dropped by washing the filtration element 2, the precoat treatment is performed again after the washing of the filtration element 2.

In addition, for example, in beer filtration, when the product type is switched without cleaning each filter element 2, the lower tank 1 is processed in the same manner as the stock solution treatment described above.
The stock solution remaining in b may be filtered, and after the filtration is completed, the stock solution may be discharged from the lower tank 1b while introducing the pressurized gas.
This makes it possible to collect the undiluted solution remaining in the lower tank 1b while preventing the filtered material from falling off when the product type is switched.

An experimental example of the above-mentioned stock solution treatment is shown below. (Experimental Example 1) When the total surface area of the filtration element 2 is 5 m ² and the pressure difference between the primary side and the secondary side of the filtration element 2 at the end of filtration is 0.5 kgf / cm ² , 0.5 kgf
When pressurized gas was introduced into the lower tank 1b at a pressure of f / cm ² and the remaining undiluted solution was recovered, the filtration flow rate indicated by the filtration rate per hour was about 1400 l / h, which was extremely efficient. Was recovered. (Experimental Example 2) This experimental example, the pressure difference between the primary side and the secondary side of the filter at the end of the filter element 2 and 2 kgf / cm ^2, other conditions are the same as Experiment 1. The fact that the pressure difference between the primary side and the secondary side of the filtration element 2 is high means that there is a large amount of the filtration material attached to the surface of the filtration element 2 and it is difficult to filter it. In the example as well, the stock solution could be collected at a filtration flow rate of about 200 l / h.

In this embodiment, the example of the two-tank type filtering device 1 in which the upper tank 1a and the lower tank 1b are partitioned by the partition plate 3 is shown, but the present invention is not limited to this, and the one-tank type filtering device is used. You can also In this case, a supporting member to which the mounting member 21 can be attached is provided in the tank of the filtering device, and the mounting member 21 is attached to this supporting member to suspend the filtering element 2 in the tank. The delivery pipe 5 is directly connected to the upper end of the spout pipe 22.

[0036]

Since the present invention is configured as described above, it has the following effects.

The filtration element of the present invention has a simple construction in which the pipe member is provided inside the filtration member, and even if the water level in the tank is lowered, filtration can be performed until the water level reaches the lower end of the pipe member. It is possible to perform filtration with less waste of the stock solution.

The filtration device of the present invention has the filtration element in which the tube member is provided inside the filtration member.
Even when the stock solution in the tank is filtered with the pressure of pressurized gas,
Filtration can be performed until the water level in the tank reaches the lower end of the pipe member. At this time, since the pressure of the pressurized gas may be increased, efficient filtration can be performed. Further, by utilizing the pressure of the pressurized gas when recovering the stock solution in the tank, it is possible to reduce the waste of the stock solution and to perform the efficient recovery.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a filtration system using an embodiment of a filtration device of the present invention.

2 is a cross-sectional view of a filter element of the filter device shown in FIG.

FIG. 3 is a partial cross-sectional view of a conventional filtration device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Filtration device 1a Upper tank 1b Lower tank 2 Filtration element 3 Partition plate 4 Undiluted solution supply pipe 5 Delivery pipe 6 Discharge pipe 7 Gas introduction pipe 8 Precoat liquid device return pipe 9 Precoat tank 10 Pump 11a, 11b, 11c, 11d, 11f, 11h, 1
1j Valve 21 Mounting bracket 22 Spout pipe 23 Filtration member

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B01D 29/24 E 29/42 510 (72) Inventor Masaji Kawamori 1-1 Namikimotomachi, Kawaguchi City, Saitama Prefecture Sapporo Building Co., Ltd. Plant Division (72) Inventor Tsuyoshi Tsubone 1-1 Namiki Motomachi, Kawaguchi City, Saitama Prefecture Sapporo Building Co., Ltd. Plant Division (72) Inventor Toshimi Zaitsu 352 Taimura Town, Midori Ward, Yokohama City, Kanagawa Prefecture −13 Human Techno Co., Ltd.

Claims (3)

[Claims] 1. A cylindrical filter element, which is suspended in a tank of a filtration device and in which a filtrate is obtained from an upper end, and a cylindrical filter member having a closed lower end for filtering a stock solution before filtration. A pipe member penetrating an attachment member that closes an upper end of the filtration member and hanging from the attachment member, the pipe member being provided inside the filtration member with a gap from an inner surface of the filtration member. Filtration element. 2. A tank to which a stock solution before filtration is supplied, and a cylindrical filter element that is hung down in the tank to filter the stock solution, and the filtrate obtained from the upper end is delivered to the outside of the tank. And a pressurizing gas introducing means for introducing a pressurizing gas into the tank, wherein the filter element is a tubular filter member having a closed lower end, and a mounting member that closes an upper end of the filter member. A filtering device comprising: a pipe member penetrating the member, hanging down from the mounting member, and provided inside the filtering member at a distance from an inner surface of the filtering member. 3. The tank is divided into an upper tank and a lower tank by a partition wall, the mounting member is fixed to the partition wall, the upper end of the pipe member is opened to the upper tank, and the pressurized gas is The filtering device according to claim 2, wherein the introducing means is connected to the lower tank.