JPH06343803A - Operation method for filter press - Google Patents

Abstract

PURPOSE:To prevent the plugging of a sludge feed opening of a filter press by intermediately supplying a sludge and supplying a high pressure water to the sludge feed opening at the time of stopping the sludge feed. CONSTITUTION:The sludge is filtered by forming a filter chamber 5 between each of plural filter plates freely attachably and detachably arranged, holding a pair of filter cloths 6 between each of filter plates 4, forming the sludge feed opening 7 for communicating the filter chambers with each other on each of the filter plates and forcibly feeding the sludge from the sludge feed opening 7 to the filter chamber 5. In this case, the sludge is intermediately supplied and the high pressure water is supplied to the sludge feed opening 7 at the time of stopping sludge feed. As a result, the sticking deposited material in the sludge feed opening is almost completely removed and the sludge is uniformly supplied to each of the filter chambers and filtered. As a result, since the differential pressure between each of the filter chambers is not generated, the filter plates are prevented from breaking and the throughput of the sludge is increased by sufficiently supplying the sludge to each of the filter chambers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a filter cloth fixed type or filter cloth running type filter press.

[0002]

2. Description of the Related Art Generally, a filter press is constructed by arranging a plurality of filter plates in a freely contactable and separable manner to form a filter chamber between the filter plates, and by sandwiching a pair of filter cloths between the filter plates. The plate is provided with a mud supply port that connects the filter chambers to each other, and the sludge is filtered by press-fitting the sludge into the filter chamber from the mud supply port. When the filtration is completed, the moisture in the dehydrated cake and the device is removed by aeration, the filter plate is opened, and the dehydrated cake is discharged.

[0003]

However, in the above filter press, the mud supply port may be clogged during the filtration process due to foreign matters in the sludge. In such a case, not only is the sludge supply port narrowed and the amount of sludge supplied into the filter chamber is reduced, but also a filter chamber where sludge easily enters and a filter chamber where it is difficult to enter are created, and the filtration differential pressure between the filter chambers This may damage the filter plate.

Therefore, according to Japanese Patent Publication No. 2-24566,
During the filtration process, the sludge supply port is cleaned to make the amount of sludge supplied to each filter chamber uniform and to eliminate the pressure differential between the filtration chambers. During mud stop,
An operation method was proposed in which compressed air was blown into the mud supply port.
However, even with this method, the problem of clogging of the mud supply port could not be completely solved.

The present invention solves the above problems, and an object of the present invention is to more thoroughly clean the mud supply port during the filtration process to prevent its clogging.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a plurality of filter plates arranged in a freely contactable and separable manner to form a filter chamber between the filter plates, and between the filter plates. A pair of filter cloths are sandwiched, and each filter plate is provided with a mud supply port that connects the filter chambers to each other.
In a method of operating a filter press that filters sludge by pressurizing sludge from the mud supply port into the filter chamber, the sludge is supplied intermittently, and high-pressure water is supplied to the mud supply port while the mud supply is stopped. It is characterized by supplying.

[0007]

With the above construction, when sludge is supplied, sludge press-fitted from the mud supply port can be filtered through the filter cloth in each filter chamber, and when mud supply is stopped, high pressure water is supplied to the mud supply port to supply mud. Almost all deposits on the mouth can be removed. As a result, the sludge can be filtered while preventing clogging of the mud supply port.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the schematic view of the filter press of FIG. In the filter press, the upper frame 3 is attached to the pair of left and right frames 1 and 2.
And a plurality of filter plates 4 are supported on the upper frame 3 so that they can come into contact with and separate from each other, thereby forming a filter chamber 5 between the filter plates 4. A pair of filter cloths 6 are sandwiched between the filter plates 4, and the inside of the filter chamber 5 is covered with the filter cloths 6. Each filter plate 4 is provided with a mud supply port 7 communicating with each filtration chamber 5, and one end of the mud supply port 7 is provided with a mud supply valve 8 and a sludge drain valve 9, which Is a sludge driving pump 10
Are connected. A compressed air source (or tank) 12 is connected to the other end of the mud supply port 7 via a blow valve 11, and a water tank 15 is connected via a water supply valve 13 and a water supply pump 14. ing. The filter plates 4 are tightened by hydraulic cylinders 16 via tightening plates 17. A water collecting groove 19 for collecting the filtrate 18 and discharging the filtrate 18 to the outside of the filter press is provided below the filter plates 4. ing.

In the filter press having the above construction, in the filtration step, each filter plate 4 is tightened with the tightening plate 17 by the hydraulic cylinder 16, the sludge drain valve 9, the blow valve 11 and the water supply valve 13 are closed, and the mud supply valve. 8 is opened, and the sludge is pumped into the filter chambers 5 from the sludge inlet 7 by the sludge injection pump 10. The sludge press-fitted is filtered through the filter cloth 6 in each filter chamber 5, and the filtrate 18 passes through the surface of the filter plate 4 and the water collecting groove 19
Collected in. Further pressing can be performed in order to improve the dehydration rate of the sludge.

At this time, the following operating method is performed in order to prevent clogging of the mud supply port 7. That is, while the mud supply is intermittently performed and the mud supply valve 8 is closed, the blow valve 1 is closed.
1 is closed, the sludge drain valve 9 and the water supply valve 13 are opened,
From the water tank 15 to the inside of the mud supply port 7 by the water supply pump 14,
High-pressure water, which is usually 3 to 10 kgf / cm ² , is supplied. The high-pressure water crushes and almost completely removes adhered deposits such as sludge and rustiness of the mud supply port 7, so that the mud supply port 7 is completely cleaned. The supply of high-pressure water to the mud supply port 7 may be performed at regular intervals, or may be performed when the pressure in the filter chamber 5 is set and a predetermined pressure is reached. On the contrary to this configuration, the high pressure water may be supplied from the sludge supply side.

By performing this operation method at the end of the dehydration operation, for example, at the end of the operation for one day, the mud supply port and the filter chamber can be easily cleaned. Further, this operating method may be performed in combination with the conventional operating method using compressed air described above, and in this case, compressed air, high-pressure water, and compressed air may be sequentially supplied. To wash with compressed air, the water supply valve 13 is closed while the mud supply valve 8 is closed to stop the mud supply, and the sludge drain valve 9 and the blow valve 1 are used.
1 is opened and air is blown into the mud supply port 7 from the compressed air source 12 through the blow valve 11.

[0012]

As described above, according to the present invention, since the mud supply port is cleaned by the high pressure water, the amount which could hardly be removed by the conventional method of blowing compressed air is almost completely removed. can do. As a result, the mud supply port is almost completely cleaned and clogging of the mud supply port is prevented, so that the sludge can be filtered in a state where the sludge is uniformly supplied into each filter chamber. As a result, a filtration differential pressure is not generated between the filter chambers, the damage of the filter plate can be prevented, and the sludge is sufficiently supplied into each filter chamber to increase the throughput.

By using the operating method of the present invention, the mud supply port and the filter chamber can be easily cleaned at the end of the operation.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a filter press in which the operating method of the present invention is performed.

[Explanation of symbols]

 4 Filter Plate 5 Filter Chamber 6 Filter Cloth 7 Mud Supply Port 13 Water Supply Valve 14 Water Supply Pump 15 Water Tank

Claims (1)

[Claims] 1. A filter chamber is formed by arranging a plurality of filter plates so that they can come into contact with and separate from each other, and a pair of filter cloths are sandwiched between the filter plates, and the filter chambers are attached to each other. In a method of operating a filter press, in which a sludge communicating with the sludge is provided, and sludge is pressed into the filter chamber through the sludge inlet, the sludge is intermittently supplied and the sludge is stopped. The method for operating a filter press is characterized in that high pressure water is supplied to the mud supply port.