Based on theoretical analysis of filtration and filtration practice, the main factors influencing the filtration of water treatment equipment are as follows:

1Temperature

During filtration, if the temperature of the suspension is low and its viscosity is high, the filtration speed will be slow.The viscosity of a liquid is an exponential function of temperature and decreases significantly as the temperature rises.Raising the temperature is a simple and effective measure to reduce viscosity, but if the temperature is too high, it can easily cause oxidation of the oil. The filtration temperature of crude oil is generally not exceeded70Degree of.

2Operating pressure

Most of the impurities in crude oil are incompressible impurities. The operating pressure is strong and the filtration rate is also high.If the suspended solid substances in the oil are composed of colloidal substances, then as the pressure increases, the voids in the filter cake become smaller, the filtration resistance gradually increases, and the filtration speed drops rapidly. Therefore, the pressure is determined according to different situations.

3Suspension concentration

The high concentration and large amount of filter residue shorten the effective filtration time in each operation cycle of intermittent production accordingly, affecting the output.For the operation of continuous vacuum filters, when the concentration is relatively high, the filter cake generated is more uniform and easy to clean in a timely manner, having little impact on the output.

4Filter media and filter AIDS

The selection of the filter medium affects the clarity of the filtered oil and whether the cake unloading is smooth.In the oil and fat industry, the filter media mostly used are fibrous media.Commonly used20Yarn count5-8Cotton fabrics such as canvas, twill and ordinary white fine cloth.It is also commonly used130#,240#,260#,261#Polyester filter cloth and828#Chemical fiber products such as vinylon filter cloth.Those with more warp and weft strands are used for crude oil filtration, while those with fewer strands are used for essential oil filtration. For some high-demand filtration, a layer of white fine cloth or flannel should be covered outside the coarse filter cloth.In addition, stainless steel wire woven filter screens are also often used.30-40hole/Centimeter filter screens are used for crude oil filtration.140-180hole/Centimeter filter screens are used for decolorizing oil filtration.

For suspensions containing a relatively large number of colloidal particles

Based on theoretical analysis of filtration and filtration practice, the main factors influencing the filtration of water treatment equipment are as follows:

1Temperature

During filtration, if the temperature of the suspension is low and its viscosity is high, the filtration speed will be slow. The viscosity of a liquid is an exponential function of temperature and decreases significantly as the temperature rises. Raising the temperature is a simple and effective measure to reduce viscosity, but if the temperature is too high, it can easily cause oxidation of the oil. The filtration temperature of crude oil is generally not exceeded70Degree.

2Operating pressure

Most of the impurities in crude oil are incompressible impurities. The operating pressure is strong and the filtration rate is also high. If the suspended solid substances in the oil are composed of colloidal substances, then as the pressure increases, the voids in the filter cake become smaller, the filtration resistance gradually increases, and the filtration speed drops rapidly. Therefore, the pressure is determined according to different situations.

3Suspension concentration

The high concentration and large amount of filter residue shorten the effective filtration time in each operation cycle of intermittent production accordingly, affecting the output. For the operation of continuous vacuum filters, when the concentration is relatively high, the filter cake generated is more uniform and easy to clean in a timely manner, having little impact on the output.

4Filter media and filter AIDS

The selection of the filter medium affects the clarity of the filtered oil and whether the cake unloading is smooth. In the oil and fat industry, the filter media mostly used are fibrous media. Commonly used20Yarn count5-8Cotton fabrics such as canvas, twill and ordinary white fine cloth. It is also commonly used130#,240#,260#,261#Polyester filter cloth and828#Chemical fiber products such as vinylon filter cloth. Those with more warp and weft strands are used for crude oil filtration, while those with fewer strands are used for essential oil filtration. For some high-demand filtration, a layer of white fine cloth or flannel should be covered outside the coarse filter cloth. In addition, stainless steel wire woven filter screens are also often used.30-40hole/Centimeter filter screens are used for crude oil filtration.140-180hole/Centimeter filter screens are used for decolorizing oil filtration.

For suspensions containing a large number of colloidal particles, adding filter AIDS can effectively increase the filtration rate. Especially for some suspension systems that are restricted by process and cannot be filtered by increasing temperature, the application of filter AIDS is of great significance. If edible phospholipids are to be produced from extracted oil, diatomite should be added as a filter aid;During dewaxing and fractionation, when filtration is carried out at a lower temperature, the effect of the filter aid becomes more obvious.

Adding a filter aid to the float can effectively increase the filtration speed.Especially for some suspension systems that are restricted by process and cannot be filtered by increasing temperature, the application of filter AIDS is of great significance.If edible phospholipids are to be produced from extracted oil, diatomite should be added as a filter aid;During dewaxing and fractionation, when filtration is carried out at a lower temperature, the effect of the filter aid becomes more obvious.