Our Case

Structure and principle of pressure filter The disc type pressure filter is mainly composed of filter, agitator, pressure filter chamber, distribution valve, blowback system, seal discharge system, scraper conveyor, high and low pressure fan, feed pump, steam-water separator, frequency conversion device and other structures [7]. The pressurized filter is to place the filter in a closed pressurized bin. During operation, the settled slime is pumped into the slime bucket by the underflow pump of the thickener, and then fed into the pulp tank of the filter press through the feed pump of the filter press. The pressurized bin is continuously filled with compressed gas until the set pressure adjusted in the production of the filter press is reached. After that, the compressed gas is continuously and stably supplied to keep the pressure in the filter press stable. The connecting shaft at the bottom end of the filter disc is connected to the distribution valve, It forms a pressure difference with the gas-water separator to realize that under the pressure in the pressurized bin, the coal slime suspension in the filter tank of the filter press enters the filtrate pipe through the filter fan and enters the distribution valve, so that the filtrate is discharged from the filter, while the coarse particles and other macromolecular substances in the coal slime are trapped and compressed on the filter plate, forming a filter cake with a certain thickness but relatively low moisture content. With the circulation of the filter disk, the filter cake passes through the drying area of differential pressure dehydration and then further reduces the moisture to form a dry filter cake. The discharge area of the distribution valve is blown back by the air bag and the scraper falls off into the scraper conveyor at the bottom of the tank, and is transferred to a certain material level in the filter press box or the dried slime is discharged from the filter press to the outside of the machine according to the set discharge time, and the slime pressure filtration realizes automatic continuous circulation [8]. At present, the pressure filter system of the coal preparation plant is equipped with a set of control programs to realize automatic program control of the pressure filter system, monitor the parameters of the production process, and have multiple functions such as equipment operation prompt and fault alarm. The more advanced program control can also achieve data statistical analysis, which is convenient to improve the equipment production efficiency and production product indicators.