Knowledge of vacuum disk filter basics critical to use?-Xinxiang Yinuo Machineries Co., Ltd.

In the industrial field, vacuum disk filter is widely used by more and more enterprises due to its high efficiency and continuous operation. For some enterprises that have just come into contact with this equipment, in-depth understanding of the basics and mastering the correct use of the equipment is the key to giving full play to its performance. This article will comprehensively sort out the relevant points to provide practical reference data for practical applications in the industry.

The basic knowledge: unveil the mystery of the vacuum disc filter

Core definition:

Vacuum disc filter is a kind of equipment that realizes the continuous separation of solid and liquid with the help of vacuum negative pressure as a power source and relying on the rotating disc set. It has this flying shovel wider application in many fields such as mining, chemical industry, environmental protection, etc., and is able to deal with a variety of different types of materials such as slurry, sludge, slurry and so on.

Core structure:

The equipment is mainly composed of five key parts.

Filter disc group is the core working area, consisting of 6-20 round filter discs, the surface of the disc is covered with filter cloth or membrane, its main role is to retain solid particles.

Vacuum system consists of a vacuum pump and gas-liquid separator, can be stabilized uncle -0.05-0.08MPa negative pressure.

transmission mechanism through the speed reducer to drive the disc to rotate at a speed of 1-5 rpm to ensure the continuity of the entire separation process; Slurry tank is used to hold the slurry to be processed and its liquid level can be automatically adjusted; Control system adopts PLC intelligent control; The control system adopts PLC intelligent control. The drive mechanism drives the disk to rotate at 1-5 rpm through a speed reducer to ensure the continuity of the whole separation process.

The slurry tank is used to hold the slurry to be processed, and its level can be automatically adjusted.

The control system adopts PLC intelligent control technology, which is capable of real-time monitoring and control of the parameters such as vacuum degree and rotating speed.

Scope of application:

Vacuum disk filter has strong adaptability to materials and can handle slurries with solid particle size of 0.1-100μm and concentration of 10%-60%. It is especially worth mentioning that it is excellent in handling high viscosity and fine particle materials, which is an advantage that traditional plate and frame filter presses and other equipment do not have.

The use of methods: standardize the operation of the whole process from startup to shutdown

1. Pre-preparation

Before starting the machine, you need to check whether the filter cloth is intact, whether there is broken or clogged; to confirm that the link of the vacuum line is tight, there can be no leakage; check the slurry groove whether there are debris, to prevent debris scratching the filter cloth, and at the same time according to the characteristics of the material to select the amount of the type of filter cloth.

2. Starting operation

Start the vacuum pump, wait until the vacuum is stabilized at the set value, turn on the slurry transfer pump, inject the slurry into the slurry tank, and control the liquid level in a position that can submerge 1/3 of the diameter of the filter disk.

Start the transmission mechanism, so that the disk group began to rotate, at this time to observe the formation of filter cake, if the cake is too thin, you can appropriately reduce the rotational speed of the disk or increase the concentration of slurry.

Fine-tune the parameters through the control system to ensure that the thickness of the filter cake is uniform, and the water content can meet the standard requirements.

3. Operation monitoring: in the process of equipment operation, need to pay attention to three indicators.

If the vacuum degree suddenly drops, it may be the case that the pipeline has a leakage or the filter cloth is broken, at this time, it is necessary to stop the machine in time for inspection;

To observe whether the filter cake can be completely stripped, if the filter cake residue, you need to adjust the angle of the scraper;

Also pay attention to whether the liquid level of the slurry tank is stable, the liquid level is too low will lead to insufficient adsorption of the filter disk, the liquid level is too high may overflow.

4. Shutdown and maintenance

When stopping, first shut down the slurry transfer pump, wait until the slurry tank is emptied, shut down the transmission mechanism, and finally shut down the vacuum pump; after the shutdown, the filter cloth must be cleaned, and the residual material on the surface of the filter cloth can be flushed with high-pressure water. If the clogging of the filter cloth is more serious, you can use dilute lye soak for 30 minutes before rinsing; weekly need to check the wear and tear of the filter cloth, monthly to add lubricating oil to the transmission mechanism, quarterly vacuum pump overhaul to ensure that the equipment can be a long-term stable operation.

The actual operation case of an environmental protection enterprise shows that, after operating in strict accordance with the specifications, the failure rate of the equipment has been reduced by 70%, the service life of the filter cloth has been extended to more than 3 months, and the processing efficiency has always been able to maintain at the design value of more than 95%. It can be seen that mastering the basic knowledge and correct use of vacuum disk filter is a prerequisite to maximize its value. With the continuous improvement of industrial production requirements for separation efficiency, standardized operation will become an important guarantee for enterprises to reduce costs and improve efficiency.