How to choose the filter belt of belt sludge filter press?

Selection of filter belt of belt sludge filter press

In the process of sludge treatment, the core part is the selection of filter screen of belt filter press. The production of qualified belt filter press depends not only on the mechanical performance of sludge filter press, but also on the selection of filter screen by professional technicians, because the filter screen used by different sludge is different. Here are some commonly used filters:

1, polyester forming net

There are two heald flat woven nets, three heald single-layer nets, two-layer half nets and other models, which are suitable for low, medium and high-speed paper machines in papermaking industry. Such as wrapping paper, newsprint, corrugated paper, advanced printing paper, cotton paper, cigarette paper and other paper machines;

2, polyester flat woven dry net

Monofilament flat woven dry net is a kind of interlaced woven filter net, which is used for drying and dewatering equipment in various industries. The characteristics of the net are flat and compact structure and good dimensional stability. The only disadvantage is that it is very troublesome to repair once it is damaged.

3. Belt sludge dewatering;

It is suitable for sludge dewatering in sewage treatment and has the characteristics of air permeability, water permeability and mud impermeability. Because of its design structure, sludge is easy to peel off after filter pressing, so it is easy to clean, with long service life and can be repaired after being damaged.

4.polyester spiral net

Polyester spiral mesh can be filled with fillers according to sludge from different industries to change the density of its filter mesh. This screen is a kind of commonly used filter screen, and it has good filter press effect on sludge with different properties. The screen contains no filler, and is suitable for the drying section of paper machine and printing machine, as well as the screen of coal washing and horizontal belt pulp washing machine. Easy to use, long service life and easy to maintain. The screen is filled in the middle of the screen ring to reduce its air permeability, the mesh is tight, the loss of substances on the screen is reduced, and it has greater lateral stiffness.

Principle of electric control system for sludge filter press

The normal operation of sludge filter press mainly depends on the auxiliary power supply circuit of air source, which mainly controls the tension and bias adjustment.

1. The pneumatic system of the belt filter press runs continuously, so as to check the flexibility, accuracy and reliability of the system action.

Sealing of hydraulic system: observe the pressure drop of pressure gauge, and check the sealing conditions of exposed surfaces and joints of all parts of the system.

2. During the operation of the sludge filter press in the electrical system, check the flexibility, accuracy and reliability of the system action.

Measurement of filter belt deviation

At the discharge drum, the deviation of the upper and lower filter belts is measured at any time based on the end face of the drum, and the maximum value is taken as the deviation of the machine filter belt. The accuracy of the measuring tools used is not less than 0.5mm..

3. Load test

Run continuously for 8 hours at the filter belt speed of 3.0m/min~4.5m/min.

Determination of water content (w) of filter cake

Sampling position and method: at the discharge roller, take one in the middle and two sides of the filter belt, each of which is not less than 30mg.

Correct use of belt filter press;

1, the correct choice of filter cloth is to consider the clarity and filtration efficiency of filtrate. At the end of each job, the filter cloth must be cleaned so that there is no residue on its surface. When the filter cloth becomes hard, it should be softened. If it is damaged, it should be repaired or replaced in time.

2, check the sealing surface of the filter plate, remove the residue on the sealing surface, so as to avoid slurry leakage and liquid leakage at work. Pay attention to protect the sealing surface from collision, and it is best to stand upright when placing it, which can reduce deformation.

3. If the electrical control system fails, first cut off the power supply and stop the machine to repair or replace components. Regularly measure the insulation performance of electrical appliances.

4. After the new machine is installed and used for one month, it is necessary to change the oil and thoroughly clean the fuel tank. After that, clean the oil tank once every six months and replace the hydraulic oil in the oil tank, which should meet the requirements. The oil level is higher than the center of the liquid level line.

5. If the hydraulic cylinder fails or leaks (including the tubing joint), please refer to the hydraulic cylinder diagram, and replace the O-ring seal and combination washer after disassembly.

6. The temperature of the filtrate is generally lower than the rated temperature.

7. Please switch valves such as feed liquid and washing water according to operating procedures, and do not mix them.

8, after the work should be timely and as far as possible the rest of the feed liquid though on the road.

9, keep the machine and the surrounding environment clean. Remove the residual filtrate and filter cake on the machine in time. Lubricate the piston rod regularly.

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