JPS6279815A - Method for controlling operation of filter press - Google Patents

Abstract

PURPOSE:To prevent the breakage of a filter plate by detecting the pressure in each filter chamber and stopping the feed of sludge when a pressure difference at more than the specified value is generated between any filter chambers when sludge is fed by a filter press. CONSTITUTION:A pressure detector 2 is embedded in each filter plate 3 or inserted into each filter chamber 1 and the pressure on the inside of the filter chamber 1 is detected. Then a detected pressure signal (a) from each filter chamber 1 is sent to an arithmetic controller 4. When a pressure difference at more than the specified value is detected between any filter chambers 1, a stop signal is outputted from the arithmetic controller 4 and the feed of sludge is stopped. After cake is discharged in the succeeding stage, the cause for the generation of the pressure difference between the filter chambers, for example, the clogging of a sludge feed mouth piece is inspected, and the breakage of the filter plate is prevented. Accordingly, a filter plate having low compressive strength (e.g., a thin-walled filter plate, a resinous filter plate and a filter plate without any reinforcing bosses) can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling the operation of a filter press.

[Conventional technology and its problems]

The filter press pressurizes the sludge by injecting the sludge into a chamber formed between multiple door panels, and performs excessive dewatering of the sludge. During pouring, there are cases where sludge does not enter a certain offshore chamber.

In this way, if pressurization is continued in a state where there is an R room containing sludge and a P room containing no sludge among multiple door cars, the pressure inside the door car that does not contain sludge will be the same as the pressure inside the door car that does not contain sludge. There is a problem that the pressure difference between the chambers F and the door panel that forms the door roller is damaged due to the pressure difference between the chambers F and the pressure inside the door roller. Also,
There is a problem in that the wall thickness of the door plate must be increased in order to prevent the door plate from being damaged even if a differential pressure occurs.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a method for controlling the operation of a hanging filter press that prevents damage to the door plate as described above.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention detects the pressure inside each push chamber during sludge injection, and stops sludge injection when a pressure difference of more than a certain level occurs between each push chamber. I tried to stop it.

[Effect]

In this invention, when a pressure difference of more than a certain level occurs between the push chambers during sludge injection, the sludge injection is stopped,
Proceeding to the next step, the cause of the pressure difference between the furnace chambers after draining the cake can be checked, such as clogging of the slurry feed cap, so that damage to the furnace plate can be prevented.

〔Example〕

The present invention will be explained in detail below.

The pressure inside the p-chamber 1 is detected, for example, by embedding the pressure detector 2 in each door plate 3 or inserting it into each p-chamber 1.

Next, the pressure detection signal & of each door car 1 is sent to the calculation/controller 4. The arithmetic/control unit 4 detects the pressure difference between each furnace chamber 1, and when it detects a pressure difference above a certain level (for example, 2 Kp/cd) between each door car 1, it issues a stop signal and stops the sludge pouring. It is designed to stop.

In addition, 5 in the figure indicates Okifu.

〔effect〕

As described above, according to the present invention, when a pressure difference occurs between the r rooms, the operation is stopped, so damage to the door plate can be prevented.

Therefore, it is possible to use door panels with low pressure resistance (thin door panels, resin door panels, door panels without reinforcing bosses, etc.).

[Brief explanation of drawings]

The drawing is a schematic diagram of an apparatus for implementing the present invention.

Claims (1)

[Claims] In the operation control method of a filter press that has multiple filter chambers between filter plates, the pressure inside each filter chamber is detected during sludge injection, and if a pressure difference of more than a certain level occurs between each filter chamber. A filter press operation control method characterized by stopping sludge injection.