Conditions affecting the filtration of water park equipment
1, temperature
When filtering, the temperature of the suspension is low, the viscosity is high, and the filtration speed is slow. The viscosity of the liquid is an exponential function of temperature, which decreases with the increase of temperature. The temperature rise is the simplest and effective measure to reduce the viscosity, but the temperature is too high. It is easy to oxidize the oil, and the filtration temperature of the oil is generally not more than 70 degrees.2, the operating pressure
Most of the impurities in the oil are incompressible impurities, the operating pressure is strong, and the filtration rate is also large. If the solid matter suspended in the oil is composed of a colloidal substance, the water park equipment becomes smaller as the pressure increases and the gap in the filter cake becomes smaller. The filtration resistance gradually increases and the filtration speed drops rapidly, so the pressure must be determined according to different conditions.
3, suspension concentration
The concentration is large and the amount of filter residue is large, which makes the effective filtration time in each operation cycle of the water park equipment intermittently shortened, which affects the output. For the operation of the continuous vacuum filter, the filter cake generated when the concentration is large is relatively uniform and easy. Timely cleaning, has little effect on production.
4, filter media and filter aids
The choice of filter media affects the degree of clarification of the filtered grease, and whether the unloading cake is smooth. The filter media used in the grease industry is mostly woven media. Commonly used 20 yarns of 5-8 strands of canvas, twill and ordinary white cloth. Also used are 130#, 240#, 260#, 261# polyester filter cloth and 828# dimension nylon filter cloth and other chemical fiber products. The number of warp and weft strands is used for crude oil filtration, and the number of strands is small for essential oil filtration. For high filtration, a layer of white cloth or flannel is required on the outside of the coarse filter cloth. In addition, a stainless steel wire woven filter screen is used, and a 30-40 hole/cm filter is used for the oil filtration, 140-180 holes/cm. The filter is used for decolorizing oil filtration.
For suspensions containing more colloidal particles, the addition of filter aids can effectively increase the filtration speed. Especially for some water park equipment, due to process limitations, it is not possible to use a suspension system that enhances temperature filtration. The application of filter aids is of great significance. To obtain edible phospholipids from leaching oil, diatomaceous earth should be added as a filter aid; in dewaxing, it must be filtered at a lower temperature, and the effect of the filter aid is more obvious.
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