Automatic backwash filters are widely used in metallurgy, chemical industry, petroleum, papermaking, medicine, food, mining, electric power, urban water supply, and other fields. Such as industrial condensate, washing water, wastewater, circulating water filtration, continuous casting water system, metallurgical industry blast furnace water system, hot rolling high-pressure water dephosphorization system, etc., is an advanced, efficient, and easy-to-operate automatic filtration device.
Working criteria:
The automatic backwash filter is composed of a shell, a filter element, a backwash rotating device, a pressure difference controller, and an electric control part.
The filter element adopts a high-strength Johnson wedge wire filter or a metal woven wire mesh filter element, and the filter element is automatically cleaned through pressure difference control and timing control. When the impurities in the filter accumulate on the inner surface of the filter element, the pressure difference between the inlet and outlet is increased to the set value (such as 1kgf/cm 2), or the timer reaches the preset time, the electric control box sends a signal to drive the backwash rotating device. When the suction cup of the backwash is facing the inlet of the filter element, the drain valve is opened, and the system is depressurized at this time. There is a negative pressure zone inside the suction cup and the filter element, which is lower than the water pressure outside the filter element (the backwash pressure difference is controlled to be 3-4 times of the filter element pressure difference), forcing part of the net circulating water to flow from the outside of the filter element into the inside of the filter element. The impurity particles adsorbed on the inner wall of the filter element enter the suction cup with the water flow and are discharged from the drain valve.
Features:
Microcomputer program control: automatic filtration, automatic identification of pressure difference, automatic backwashing, automatic drainage, low operating cost.
Uninterrupted continuous work: clean the filter element one by one, and filter continuously.
High efficiency and low consumption: The effective filtering area is large, the backwash frequency is low, the sewage volume is small, and the system resistance loss is small.
Good backwashing effect: the unique filter structure design and cleaning control method make the backwashing strong and thorough.
Wide application range: The accuracy covers 10-3000 microns.
Application areas:
Metallurgical industry: filtering heavy metal waste, cleaning and recovering particulate impurities in water systems such as washing water, cooling circulating water, condensate water, etc., protecting nozzles and pumps, ensuring high product quality and long-term stable operation of the system.
Chemical industry, petrochemical industry: filter impurities in brine, industrial water, and circulating cooling water systems, purify chemical media, and improve product quality.
Power plants, thermal power plants: Filter the impurity particles in the wet electric precipitator spray, spray circulating gray water, condensate water, and desulfurization wastewater systems, purify water quality, protect nozzles and pumps, and ensure long-term stable operation of the system.
Oilfield sewage: filter suspended solids in oilfield sewage to ensure the quality of make-up water.
