JP7129627B2 - Filter press filter cloth washing method - Google Patents

Description

The present invention relates to a filter cloth cleaning method for a filter press for cleaning filter cloths arranged in filtration chambers formed between filter plates, in which washing water is supplied to the filtration chambers and the filter cloths in the filtration chambers are agitated and washed. It relates to a filter cloth cleaning method.

Conventionally, as a method for cleaning the filter cloth of a filter press, after opening the filter plate to discharge the dewatered cake, washing water is sprayed on the filtration surface of the filter cloth while maintaining the plate open state, and the dehydrated cake adhering to the filter cloth is removed. A cleaning method is used to remove the
In addition, as in Patent Document 1, after the dehydrated cake is discharged, the filter plate is closed, and the filter chamber in which the filter cloth is arranged is filled with cleaning liquid and compressed air is injected to remove the dehydrated cake from the filter cloth. A cleaning method that removes the

Japanese Utility Model Publication No. 04-54802

As with conventional filter presses, cleaning methods in which cleaning water is sprayed onto the filter cloth with the filter plates open require a cleaning device for spraying cleaning water. The equipment had to be moved, making the equipment complex and expensive.
In addition, as in Patent Document 1, washing the filter cloth only with compressed air after the filtration chamber is filled with washing water does not have sufficient detergency, and the sludge clogging the filter cloth cannot be removed. I didn't. Furthermore, in Patent Document 1, since compressed air is injected from the back of the filtration surface, the cleaning power for the filtration surface side is low. There was also the problem of low
The present invention provides a filter cloth washing method for a filter press that can wash the entire surface of the filter cloth in the filtration chamber with high detergency.

In the filter cloth cleaning method of a filter press for cleaning the filter cloth arranged in the filter chamber formed between a plurality of filter plates, a step S1 of closing the plurality of filter plates to form a filter chamber between the filter plates; A step S2 of supplying a soluble shock body formed by freezing a liquid containing a chemical solution and a washing liquid to the filtration chamber through a raw liquid supply hole opened in the plate, and supplying the washing liquid from the top of the filtration chamber and discharging it from the bottom while discharging air from the bottom. is supplied from the bottom of the filtration chamber and discharged from the top, and the filtration chamber is agitated so that the impact body is moved to impact the surface of the filter cloth ; By performing the steps S3 and S5 while returning the cleaning liquid discharged from the filtration chamber , a high filter cloth washing ability can be obtained , and the running water and the Stirring by air becomes possible .

According to the present invention, when cleaning the filter cloth of a filter press, an impacting body is supplied to the filtration chamber together with a cleaning liquid, and air is jetted to cause the impacting body to move freely and collide with the filter cloth, thereby obtaining a high cleaning power. be done. By washing the filter cloth, clogging of the filter cloth can be eliminated, deterioration of filtration performance can be prevented, and the service life of the filter cloth can be extended.
Since the impacting body is soluble, it does not need to be recovered after cleaning, and can be discharged together with the cleaning liquid.
In addition, complicated cleaning equipment is no longer required, and equipment costs and maintenance costs can be reduced.

1 is a schematic configuration diagram of a filter press according to the present invention; FIG. Similarly, it is a side view of a filter press. Similarly, it is a front view of the filter plate of the filter press. Similarly, it is a rear view of the filter plate of the filter press. Similarly, it is a cross-sectional view of the filter chamber during the dewatering operation of the filter press. Similarly, it is a cross-sectional view of the filter chamber supplying the impact body. Similarly, it is a cross-sectional view of the filter chamber during cleaning of the filter cloth of the filter press.

FIG. 1 is a schematic configuration diagram of a filter press according to the present invention.
The present invention is a filter press for cleaning a filter cloth by supplying a cleaning liquid to a filter chamber, in which a soluble impacting body that floats in the filtering chamber together with the cleaning liquid is supplied, and the impacting body collides with the filter cloth to clean the filter. This is a filter cloth washing method for a press.

The filter press 1 connects the undiluted solution storage tank 2 with the undiluted solution supply pipe 3 , and supplies the sludge in the undiluted solution storage tank 2 to the filter press 1 by means of the sludge supply pump 4 provided in the undiluted solution supply pipe 3 .
A cleaning liquid storage tank 5 for storing cleaning liquid and an undiluted liquid supply pipe 3 are connected by a cleaning liquid supply pipe 6 , and a cleaning liquid pump 7 is provided in the cleaning liquid supply pipe 6 .
An impact body tank 9 storing a soluble impact body 8 and a cleaning liquid supply pipe 6 are connected by an impact body supply pipe 10 , and the impact body supply pipe 10 is provided with an on-off valve 11 .
The impact body supply pipe 10 is connected to the cleaning fluid supply pipe 6 in the upstream stage of the cleaning fluid pump 7, and supplies the cleaning fluid and the impact body 8 to the filter press 1 when the on-off valve 11 is opened.

A drain pipe 12 , an air supply pipe 13 and an exhaust pipe 14 are connected to the filter press 1 . A drain pipe 12 discharges the filtrate filtered by the filter press 1 . When cleaning the filter cloth, the cleaning liquid is returned from the drain pipe 12 to the cleaning liquid storage tank 5 for reuse. An air supply pipe 13 is connected to a blower 15 to supply air to the filter press 1, and an exhaust pipe 14 discharges the air supplied by the blower 15 to the outside of the machine.

FIG. 2 is a side view of a filter press according to the invention.
The filter press 1 of the present invention comprises a frame 17 arranged on the left and right, a pair of guide rails 18, 18 supported between the frames 17, 17, and a plurality of filter plates 19 movably arranged side by side on the guide rails 18. , and an opening/closing device 20 for opening and closing the filter plate 19 .
A filter cloth 21 is stretched on both sides of the filter plate 19 . When the plurality of filter plates 19 are closed, a filter chamber 22 with a filter cloth 21 stretched therein is formed, and the undiluted solution is supplied between the filter cloths 21, 21 of the filter chamber 22 for dehydration.
In addition, an undiluted solution supply pipe 3 for supplying the undiluted solution, the cleaning solution, and the impact body 8 and an exhaust pipe 14 for discharging air from the filtering chamber 22 are connected to the upper portion of the filtering chamber 22 . Further, a drain pipe 12 for discharging filtrate and washing liquid and an air supply pipe 13 for supplying air to the filter chamber 22 are connected to the lower portion of the filter chamber 22 .

FIG. 3 is a front view of the filter plate of the filter press according to the present invention.
A concave filter bed 23 is formed in the central portion of the filter plate 19 , and a filter cloth 21 is stretched over the filter bed 23 .
On the upper part of the filter bed 23, a raw solution supply hole 24 communicating with the raw solution supply pipe 3 and an exhaust hole 25 for discharging air used in cleaning the filter cloth 21 are opened. right).
A water passage hole 27 for the filtrate and the washing liquid is opened in the lower portion of the filter bed 23, and the water passage hole 27 is passed through a communication port 26b provided on the other side surface of the filter plate 19 (left side in FIG. 3).

FIG. 4 is a rear view of the filter plate of the filter press according to the present invention.
Similar to the front surface of the filter plate 19 , a filter bed 23 is formed in the central portion, and a filter cloth 21 is stretched over the filter bed 23 . A stock solution supply hole 24 is opened in the upper part of the filter bed 23 .
An air supply hole 28 for supplying air used for washing the filter cloth 21 is opened in the lower part of the filter bed 23, and the air supply hole 28 is passed through a communication port 26c provided on one side surface of the filter plate 19 (left side of FIG. 4).

As shown in FIGS. 3 and 4, a stock solution supply hole 24 is opened in the upper portion of the filter plate 19 . The undiluted solution supply hole 24 is connected to the undiluted solution supply pipe 3 , and when the plates are closed, the undiluted solution supply holes 24 of the plurality of filter plates 19 communicate with each other to form a passage for supplying the undiluted solution to the filtration chamber 22 .
The plurality of filter plates 19 are provided with communication ports 26a, 26b and 26c, respectively, and the communication ports 26a, 26b and 26c of the filter plates 19 communicate with each other when the plates are closed.
During cleaning of the filter cloth 21 , the cleaning liquid is supplied from the undiluted liquid supply hole 24 , the cleaning liquid is discharged from the water passage hole 27 , air is supplied from the air supply hole 28 , and the air is discharged from the exhaust hole 25 .
The water passage hole 27, the air supply hole 28, and the communication ports 26b and 26c are used as pipes for discharging filtrate that has passed through the filter cloth 21 during the dehydration operation of the filter press 1. FIG.

FIG. 5 is a cross-sectional view of the filter chamber during dehydration operation of the filter press according to the present invention.
The dehydration operation of the filter press 1 is performed with the plurality of filter plates 19 closed. A filter chamber 22 is formed between the filter plates 19 and 19 by closing the plurality of filter plates 19 . A pair of filter cloths 21 , 21 are stretched in the filtration chamber 22 .
During the dehydration operation, valves (not shown) are used to open the communication ports 26b and 26c and close the communication port 26a. The liquid is discharged from the water passage hole 27 and the air supply hole 28 through the communication ports 26b and 26c. As the water is discharged, the solid content remains in the filtering chamber 22 and a dehydrated cake is produced.

FIG. 6 is a cross-sectional view of a filter chamber supplying an impactor according to the invention.
The communication ports 26 a , 26 b , 26 c are closed, and the cleaning liquid and the impact body 8 are supplied to the filter chamber 22 from the undiluted liquid supply hole 24 .

FIG. 7 is a cross-sectional view of the filter chamber during cleaning of the filter cloth of the filter press according to the present invention.
In the filter press 1 of the present invention, after discharging the dehydrated cake, the filtering chamber 22 is filled with a cleaning liquid and a soluble impact body 8 (ice, water-soluble capsules, etc.) to clean the filter cloth 21 . By supplying the cleaning liquid from the cleaning liquid storage tank 5 through the cleaning liquid supply pipe 6 to the filter chamber 22 and by injecting air from the air supply hole 28 , the impact body 8 and the filter cloth 21 are agitated by the running water and the air. The dehydrated cake adhering to the filter cloth 21 is peeled off by collision. The supplied washing water is discharged from the water passage hole 27 and the air is discharged from the exhaust hole 25 .
Since the impact body 8 is soluble, it dissolves in the washing liquid after the filter cloth 21 is washed.

Here, the impact body 8 will be described in detail. The impact body 8 has a shape and size such as a spherical shape, a cylindrical shape, a box shape, etc., as long as it can flow into the filter chamber 22 from the impact body supply pipe 10 together with the cleaning liquid. Not limited.
By setting the specific gravity of the impact body 8 to 0.8 to 1.3, the impact body 8 can move in the cleaning liquid and impact the filter cloth 21 when supplied to the filter chamber 22 .

The impact body 8 has solubility, and after the filter cloth 21 has been washed, one that can be dissolved in the washing liquid is used. For example, it can be freely selected within the range of specific gravity as long as it has solubility, such as frozen water or chemical solution, or water-soluble capsules.
The impact body 8 may be formed by mixing sand grains, a dehydration aid, or the like to adjust the specific gravity.
Although a known pump can be used as the cleaning liquid pump 7 for conveying the impact body 8 together with the cleaning liquid, a positive displacement rotary pump is preferable in consideration of damage to the pump.

In the filter press 1 of the present invention, after the stock solution is dehydrated in the filter chambers 22 in the filter plates 19 closed in parallel, the filter plates 19 are opened and the dehydrated cake is discharged from the filter chambers 22 . The dehydrated cake is separated from the filter cloth 21 by its own weight, vibration of the filter cloth 21, or the like. The filter cloth 21 is washed because the dehydrated cake or clogged sludge that could not be removed due to its own weight or vibration adheres to the filter cloth 21 .

The cleaning of the filter cloth 21 includes step S<b>1 of first closing the plurality of filter plates 19 to form the filter chambers 22 between the filter plates 19 . The communication ports 26a, 26b, and 26c are respectively provided with valves (not shown) to close all of them. The on-off valve 11 of the impact body supply pipe 10 is also closed.
An empty filter chamber 22 is formed because the dehydrated cake is discharged by opening the plates.

After the filter chamber 22 is formed, the process proceeds to step S2 of supplying the cleaning liquid and the impact body 8 to the filter chamber 22 .
The on-off valve 11 is opened and the cleaning liquid pump 7 is started to supply the cleaning liquid and the impact body 8 to the filtration chamber 22 . When the filter chamber 22 is filled with the cleaning liquid and the impact body 8, the cleaning liquid pump 7 is stopped.

When the filter chamber 22 is filled with the cleaning liquid and the impact body 8, the step S3 of agitating the filter chamber 22 is started.
With the on-off valve 11 closed and the valve of the communication port 26b open, the cleaning liquid pump 7 is started. The cleaning liquid supplied by the cleaning liquid pump 7 is supplied to the filter chamber 22 through the undiluted liquid supply hole 24 . A water flow of the cleaning liquid is generated in the filtering chamber 22 by supplying the cleaning liquid to the filtering chamber 22 and discharging the cleaning liquid from the water passage hole 27 . The cleaning liquid supplied to the filter chamber 22 agitates the impact body 8 to impact the filter cloth 21, thereby separating the dehydrated cake and clogged sludge. The discharged cleaning liquid is returned to the cleaning liquid storage tank 5 . After stirring by the cleaning liquid pump 7 for a predetermined time, the cleaning liquid pump 7 is stopped.

Next, in order to start the blower 15, the valves of the communication ports 26a and 26c are opened and the valve of the communication port 26b is closed. By activating the blower 15, the air sent from the blower 15 is supplied from the air supply hole 28 to the filtration chamber 22 to perform bubbling. In the filter chamber 22, the filter cloth 21 is washed by the air, and the air agitates the impact body 8, thereby further enhancing the washing effect.
The air supplied to the filtering chamber 22 is discharged outside through the exhaust hole 25 . After stirring by the blower 15 for a predetermined time, the blower 15 is stopped.

Next, the valve of the communication port 26b is opened, and the cleaning liquid pump 7 and the blower 15 are started simultaneously to agitate the filtration chamber 22. As shown in FIG.
By supplying cleaning water to the filter chamber 22 with the cleaning liquid pump 7 and supplying air to the filter chamber 22 with the blower 15 , the impact body 8 moves largely in the filter chamber 22 . The filter cloth 21 is effectively washed by washing with water flow and bubbling.
After washing the filter cloth 21 for a predetermined time, the washing liquid pump 7 and the blower 15 are stopped to finish washing.

One of the agitation by the washing liquid pump 7 and the agitation by the blower 15, and the agitation by starting the washing liquid pump 7 and the blower 15 at the same time may be selected according to the degree of clogging of the filter cloth 21. If selected, the order in which they are performed may be changed as appropriate.

After the stirring is completed, the process proceeds to step S4 of dissolving the impact body 8 . Since the impact body 8 has solubility, it dissolves in the cleaning liquid. Although the impact body 8 is dissolved after a predetermined time has passed, the dissolution rate may be increased by heating or stirring with the blower 15 .

Finally, step S5 of discharging the cleaning liquid from the filtration chamber 22 is performed. The valve of the communication port 26a is closed, and the cleaning liquid in which the impact body 8 is dissolved is discharged from the communication ports 26b and 26c.
Since the empty filtration chamber 22 is formed after the cleaning liquid is discharged, sludge can be supplied from the raw liquid storage tank 2 as it is for dehydration.

1 filter press 8 impact body 19 filter plate 21 filter cloth 22 filter chamber

Claims (1)

In a filter cloth washing method for a filter press (1) for washing a filter cloth (21) arranged in a filtration chamber (22) formed between a plurality of filter plates (19),
A step (S1) of closing a plurality of filter plates (19) to form a filtration chamber (22) between the filter plates (19, 19);
a step (S2) of supplying a soluble impactor (8) formed by freezing a liquid containing a chemical liquid and a cleaning liquid to the filter chamber (22) through a stock liquid supply hole (24) opened in a filter plate (19) ;
The washing liquid is supplied from the upper part of the filter chamber (22) and discharged from the lower part, and the air is supplied from the lower part of the filter chamber (22) and discharged from the upper part, and the impact body (8) is moved to impact the surface of the filter cloth (21). a step (S3) of agitating the filtering chamber (22) to provide
a step (S4) of dissolving the impactor (8) of the filter chamber (22);
A step (S5) of discharging the cleaning liquid from the filtration chamber (22) ,
Steps (S3) and (S5) are performed while returning the washing liquid discharged from the filtration chamber (22).
A filter cloth cleaning method for a filter press, comprising:

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