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Characteristics and Selection of Filters

Characteristics and Selection of Filters

The fiber ball used in the filter material has the characteristics of corrosion resistance, high elasticity, wear resistance, and variable voids. During the working process, due to factors such as the working pressure of the filter, the impact force of water flow, and the weight of the filter material itself, the porosity of the filter layer gradually decreases from top to bottom along the direction of water flow, forming an ideal distribution pattern of loose upper part and dense lower part of the filter layer.

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Research on Cleaning and Reusing Technology of Polypropylene Filter Bag in Filters

Research on Cleaning and Reusing Technology of Polypropylene Filter Bag in Filters

Polypropylene filter bags have high prices, frequent replacement, and high consumption. By combining surface cleaning and deep cleaning, large particles trapped on the surface of the filter bag and small particles adsorbed in the three-dimensional space of the inner layer are removed, achieving the repair and reuse of the filter bag and effectively reducing the operating cost of water treatment.

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What is the function of a filter?

What is the function of a filter?

A filter is an indispensable device on the transmission medium pipeline, usually installed on the inlet end of pressure reducing valves, relief valves, constant water level valves, and other equipment such as square filters. After the filter has a certain specification of filter cartridge, its impurities are blocked. When cleaning is needed, simply take out the detachable filter cartridge, process it, and reinstall it, making it extremely convenient for use and maintenance. The working principle of the filter is that the water to be treated by the filter enters the body from the inlet, and impurities in the water deposit on the stainless steel filter mesh, resulting in a pressure difference. Monitor the pressure difference changes at the inlet and outlet through a pressure difference switch. When the pressure difference reaches the set value, the electric controller sends a signal to the hydraulic control valve to drive the motor. After the installation of the equipment, technicians debug it, set the filtration time and cleaning conversion time. The water to be treated enters the body from the water inlet, and the filter begins to work normally. When the preset cleaning time is reached, the electric controller sends signals to the hydraulic control valve and driving motor, triggering the following actions: the electric motor drives the brush to rotate, cleaning the filter element, and controlling the valve to open for drainage. The entire cleaning process only lasts for tens of seconds, When the cleaning is completed, close the control valve, the motor stops rotating, the system returns to its initial state, and begins the next filtering process. The interior of the filter housing is mainly composed of coarse filter screens, fine filter screens, suction pipes, stainless steel brushes or stainless steel suction nozzles, sealing rings, anti-corrosion coatings, rotating shafts, etc. A simple filter is formed by separating the container into upper and lower chambers using a filtering medium. The suspension is added to the upper chamber, and under pressure, it enters the lower chamber through the filtering medium to form a filtrate. Solid particles are trapped on the surface of the filtering medium to form a filter residue (or filter cake). During the filtration process, the filter residue layer on the surface area of the filter medium gradually thickens, and the resistance of liquid passing through the filter residue layer increases, resulting in a decrease in filtration speed. When the filter chamber is filled with filter residue or the filtering speed is too low, stop filtering, remove the filter residue, and regenerate the filtering medium to complete a filtering cycle. The liquid must overcome resistance when passing through the filter residue layer and filter medium, so there must be a pressure difference on both sides of the filter medium, which is the driving force for achieving filtration. Increasing the pressure difference can accelerate filtration, but particles that deform under pressure are prone to clogging the pores of the filtering medium at large pressure differences, resulting in slower filtration. There are three methods for suspension filtration: slag layer filtration, deep filtration, and sieve filtration Filter residue layer filtration: In the initial stage of filtration, the filter medium can only retain large solid particles, while small particles pass through the filter medium with the filtrate. After the formation of the initial filter residue layer, the filter residue layer plays a major role in filtration, where both large and small particles are intercepted, such as in the filtration of a plate and frame filter press Deep filtration: The filtering medium is thick, and the suspension contains fewer solid particles, which are smaller than the pores of the filtering medium. During filtration, particles enter and are adsorbed in the pores, such as through porous plastic tube filters and sand filters Sieve filtration: The solid particles intercepted by filtration are larger than the pores of the filtering medium, and the solid particles are not adsorbed inside the filtering medium. For example, the rotary drum filter screen filters out coarse impurities in sewage. In the actual filtering process, the three methods often appear simultaneously or sequentially.

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What types of filters are there? What are the functions of each?

What types of filters are there? What are the functions of each?

Filter classification According to the structure, filters used in industrial filtration can be divided into bag filters, precision filters, activated carbon filters, multi-media filters, quartz sand filters, state-owned enterprises, mechanical filters, carbon steel filters, stainless steel imitation glass fiber reinforced plastic filters. According to the scope of application, it can be divided into petrochemical filters, textile printing and dyeing filters, biopharmaceutical filters, semiconductor electronic filters, food and beverage filters, Baijiu filters, well water and river water filters. Filter function 1. Used for the removal and polishing of suspended solids, sediment, particles in edible oil, carbon black in cellulose, polishing of gelatin, liquid syrup, syrup, corn syrup, and interception of carbon ink and filter aids in sugar making, starch processing, milk processing, and mud removal in soft drinks, security filtration before filling, filtration of various process water, syrup, and other raw materials Remove impurities generated in the blending process. 2. It is used for recovering chemical catalyst, filtering impurities in pipeline system, polishing process media, alkaline and acidic liquids, solvents, emulsions and dispersions, and removing gel, acrylic acid and viscose emulsion from resin. In the fine chemical industry, the removal of activated carbon or catalyst is a typical example of high standard applications in chemical treatment.

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