CN103933763A - Cleaning method of filter press - Google Patents

Abstract

The invention discloses a cleaning method of a filter press, which comprises the following steps: installing a medicine feeding pipeline valve on the mud inlet pipeline of the filter press, installing a flange blind plate at the outlet of the filtrate pipeline, and installing a valve on the filtrate above the filter press Install exhaust valve and return pipeline valve on the pipeline; when the filter press is compressed, open the medicine inlet pipeline valve, exhaust valve and return pipeline valve, and pump the cleaning agent into the filter press until the return pipeline has medicine. The liquid flows out, then close the valves of the feed pipeline and the return pipeline, and soak for 8-24 hours; loosen the filter plate, drain the cleaning agent, and use a high-pressure water gun to clean the filter plate, filtrate holes, and residues attached to the filter cloth. This cleaning method can clean the difficult-to-dissolve and clean substances on the filter plate and filter cloth of the filter press at one time; it saves a lot of labor and time, reduces the labor intensity of the operators, and simplifies the process; it can prolong the life of the filter press. The service life of plates, filter cloths and other ancillary equipment.

Description

Cleaning method of filter press

technical field

The invention relates to the technical field of filter presses, in particular to a cleaning method for filter presses.

Background technique

As an ideal suspension solid-liquid separation equipment, the filter press has been more and more widely used in the field of industrial production. However, there are problems that the filter plate and filter cloth of the filter press are easy to block and difficult to clean during the application process. In order to ensure the good filtration performance of the filter press, the filter plate and filter cloth of the filter press must be thoroughly cleaned regularly. The reasons for the clogging of the filter plate and filter cloth of the filter press are very complicated, and it is difficult to use conventional methods. For example, if the filter press is equipped with an automatic high-pressure cleaning device, it is difficult to clean it thoroughly.

The conventional cleaning method currently used is: use the automatic high-pressure cleaning device attached to the filter press to clean it 1 to 2 times a day, but if the cleaning is not thorough, the filter plate and filter cloth will still be slowly blocked. Cleaning with the automatic high-pressure cleaning device attached to the machine will have no effect. At present, the method of thoroughly cleaning the filter plate and filter cloth of the filter press is: remove all the hundreds of filter cloths on the filter press, put them in a container and soak them in chemicals for 2 to 3 days, and then clean them with small high-pressure cleaning equipment. After cleaning piece by piece, put them back together; the residual blockage in the filter plate groove of the filter press should also be cleaned piece by piece, and the filtrate hole should be dredged; the disadvantage of this cleaning method is that the filter cloth needs to be disassembled and assembled , the operation is very cumbersome and complicated, and it takes 8 to 10 people 10 hours to complete the cleaning of the filter plate and filter cloth of a plate and frame filter press. This cleaning method is time-consuming and laborious.

Thorough cleaning cycle of the filter plate and filter cloth of the filter press: Due to the different filter media, the cycle of thorough cleaning and the difficulty of cleaning will be different, such as: 20 days to 30 days for the filter press in the field of sludge treatment The filter plate and filter cloth need to be thoroughly cleaned once to ensure the good filtration performance of the filter press. The cleaning frequency of the filter plate and filter cloth is very high. Come to great trouble.

Contents of the invention

Based on this, the object of the present invention is to provide a cleaning method for a filter press without disassembly.

The specific technical scheme is as follows:

A cleaning method for a filter press, comprising the steps of:

Set the drug feed pipeline valve on the mud inlet pipeline of the filter press, set a flange blind plate at the outlet of the filtrate pipeline, and set an exhaust valve and a return pipeline valve on the filtrate pipeline above the filter press;

When the filter press is in a tight state, open the valves of the medicine inlet pipeline, exhaust valve and return pipeline valve, pump the cleaning agent into the filter press until the medicine liquid flows out of the return pipeline, and then close the valves of the medicine inlet pipeline and the backflow pipeline. Pipeline valves, soak for 8-24h;

Loosen the filter plate, drain the cleaning agent, and use a high-pressure water gun to clean the filter plate, filtrate holes and residues attached to the filter cloth.

In one embodiment, the cleaning agent is a mixed solution of oxalic acid and hydrochloric acid, wherein the added concentration of oxalic acid is 1.0-5.0wt%, and the added concentration of 31wt% hydrochloric acid is 4.0-7.0wt%.

In one of the embodiments, the soaking time is 12-20h.

In one of the embodiments, the filter press is a plate and frame filter press, a box filter press or a membrane filter press.

The advantages of the present invention are as follows:

The cleaning method of the filter press of the present invention is to make relevant changes to the structure of the filter press: a medicine feeding pipeline valve is set at the mud inlet pipeline of the filter press, a flange blind plate is set at the outlet of the filtrate pipeline, and a flange blind plate is set at the filter press Set the exhaust valve and the return pipeline valve on the filtrate pipeline above the filter press. When the filter press is compressed, open the medicine inlet pipeline valve above the mud inlet pipeline and the exhaust valve above the filtrate outlet pipeline, and open the valve on the filtrate outlet pipeline. A blind plate is installed below, which can turn the filter press into a container for soaking filter plates and filter cloths. Then pump the cleaning agent into the filter press to soak the filter plate and filter cloth, and finally drain the reaction solution, and then use a high-pressure water gun to clean the filter plate groove, filtrate hole and residue attached to the filter cloth at one time , to restore the filtration performance of the filter press, the entire cleaning process only needs 2 operators and can be completed within 2 hours.

(1) This cleaning method can effectively clean the difficult-to-dissolve and clean substances on the filter plate and filter cloth of the filter press at one time;

(2) This cleaning method does not need to remove the filter cloth from the filter press for cleaning, which saves a lot of labor and time required for disassembling and assembling the filter cloth, reduces the labor intensity of the operators, and simplifies the process;

(3) This cleaning method can prolong the service life of the filter plate, filter cloth and other auxiliary equipment of the filter press.

Description of drawings

Figure 1 is a schematic diagram of the modified filter press (1 is the flange blind plate installed on the filtrate pipeline; 2 is the inlet pipeline valve installed on the mud inlet pipeline; 3 is the exhaust valve and return pipeline valve installed on the filtrate pipeline above the filter press ).

Detailed ways

The application will be further elaborated below in conjunction with the accompanying drawings.

Guangdong Esquel Textile Co., Ltd. introduced 6 sets of advanced fully automatic flap diaphragm filter presses in 2012. Within one month of operation, the operation was basically stable, the mud cake was well formed, and the mud cake was thick and even in thickness. , The mud cake and filter cloth can be peeled off naturally, and the sludge output is about 70 tons/day. However, after one month, the mud cake gradually became thinner, the thickness was uneven, and the mud cake stuck to the filter cloth. It was necessary to manually use special tools to shovel the mud cake from the filter cloth. The efficiency is reduced, the output of mud pressing is reduced, the manual labor intensity is high, and the automatic high-pressure cleaning device attached to the filter press cannot be cleaned thoroughly.

The equipment manufacturer provides another cleaning method, which is to remove the filter cloth and filter plate of the filter press one by one, soak in a certain concentration of ferric chloride solution for 2 to 3 days, and then rinse with a high-pressure water gun. This method can clean the equipment. Clean, but the operation is complicated, time-consuming and labor-intensive (8 to 10 people can complete the cleaning of the filter plate and filter cloth of a plate and frame filter press in 10 hours).

This implements a kind of cleaning method of filter press, comprises the steps:

Set the drug feed pipeline valve on the mud inlet pipeline of the filter press, set a flange blind plate at the outlet of the filtrate pipeline, and set an exhaust valve and a return pipeline valve on the filtrate pipeline above the filter press;

When the filter press is in a tight state, open the valves of the medicine inlet pipeline, exhaust valve and return pipeline valve, pump the cleaning agent into the filter press until the medicine liquid flows out of the return pipeline, and then close the valves of the medicine inlet pipeline and the backflow pipeline. Pipeline valves, soak for 8-24h (preferably 12-20h);

Loosen the filter plate, drain the cleaning agent, and use a high-pressure water gun to clean the filter plate, filtrate holes and residues attached to the filter cloth.

The cleaning agent is a mixed solution of oxalic acid and hydrochloric acid, wherein the added concentration of oxalic acid is 1.0-5.0wt%, and the added concentration of 31wt% hydrochloric acid is 4.0-7.0wt%.

The above cleaning method is suitable for plate and frame filter press, box filter press or diaphragm filter press.

The above cleaning method does not need to remove the filter cloth for cleaning, but only needs to make full use of the characteristics of the filter press, and a good airtight container can be formed for soaking the filter plate and filter cloth when the filter press is pressed. Then pump the cleaning agent into the filter press, soak and react the filter plate and filter cloth for about 8 to 24 hours, then loosen the filter plate, drain the reaction solution, and then use a high-pressure water gun to clean the filter plate groove, filtrate hole and filter cloth. The residue attached to the cloth is cleaned at one time to restore the filtration performance of the filter press. The entire cleaning process can be completed within 2 hours by only 2 operators.

This method can thoroughly clean the filter cloth, and is simple to operate, saves time and effort, and completely solves the cleaning problem of the filter cloth and filter plate during the use of the filter press of the company.

The advantages of the above cleaning method are as follows:

(1) This cleaning method can effectively clean the difficult-to-dissolve and clean substances on the filter plate and filter cloth of the filter press at one time;

(2) This cleaning method does not need to remove the filter cloth from the filter press for cleaning, which saves a lot of labor and time required for disassembling and assembling the filter cloth, reduces the labor intensity of the operators, and simplifies the process;

(3) This cleaning method can prolong the service life of the filter plate, filter cloth and other auxiliary equipment of the filter press.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (4)

1. a cleaning method of filter press, is characterized in that, comprises the steps: Set the drug feed pipeline valve on the mud inlet pipeline of the filter press, set a flange blind plate at the outlet of the filtrate pipeline, and set an exhaust valve and a return pipeline valve on the filtrate pipeline above the filter press; When the filter press is in a tight state, open the valves of the medicine inlet pipeline, exhaust valve and return pipeline valve, pump the cleaning agent into the filter press until the medicine liquid flows out of the return pipeline, and then close the valves of the medicine inlet pipeline and the backflow pipeline. Pipeline valves, soak for 8-24h; Loosen the filter plate, drain the cleaning agent, and use a high-pressure water gun to clean the filter plate, filtrate holes and residues attached to the filter cloth. 2. the cleaning method of filter press according to claim 1, is characterized in that, described cleaning agent is the mixed solution of oxalic acid and hydrochloric acid, and wherein the addition concentration of oxalic acid is 1.0-5.0wt%, the addition of the hydrochloric acid of 31wt% The concentration is 4.0-7.0wt%. 3. The cleaning method of filter press according to claim 1, characterized in that, the soaking time is 12-20h. 4. The method for cleaning a filter press according to any one of claims 1-3, wherein the filter press is a plate and frame filter press, a box filter press or a diaphragm filter press.