Purpose of Invention

Environmental pollution is one of the most serious problems facing humanity and other life forms on our planet today. It is under such a scenario Filter Concept Pvt Ltd has taken some strong initiative and accepted the challenges to overcome pollution related problem faced by various industries. As part of it the company has introduced pollution control equipment to reduce emission of hazardous contaminants generated by various industries such as oil and gas, petrochemicals, pharmaceuticals, steel and power, cement, formulations, fertilizers, textile, paints and inks, chemicals, mines and mineral, electronics and many others. It has developed self-cleaning filter systems to restrict emission level as low as 10 mg/m3, which is very less compared to environmental pollution control norms in India and across the globe.

Function of Innovation

The self-cleaning filter is constructed of filter housing, filter element, back flushing valve, differential pressure gauge, differential pressure switch, Scraper, geared motor with sensor and a control panel. The filter housing can be offered in various materials of construction such as different grades of stainless steel, carbon steel and alloy metal. Filter elements can be offered in wedge wire, multi layered wire mesh, and plain wire mesh configuration, depending upon process requirements. These filters can offer filtration levels starting from 1 micron to 2000 micron. They are designed to deliver flow rate up to 2000 m3/hr or even more than that with parallel configuration.

Scraper Mechanism

The medium to be cleaned is guided into the filter by inlet, which passes from inside to outside through the cartridge gap. After filtration, the filtered fluid exits the filter housing from the top, opposite to the inlet connection and the bigger solids are separated on the surface of the triangular cartridge wires. When it runs for a certain time, the cartridge gap gets plugged by impurities and meanwhile the differential pressure reaches its pre-set value. Then PLC inspects the signal and sends out the indication.

The gear motor drives the scraper and the particles or agglomerates are skimmed from the surface, thereby keeping the function of cartridge well and keeping the cartridge gap clean. When the impurities at the bottom of the filter increases, the drain valve opens up and the impurities are emptied successfully, which makes the system pressure achieve normality. Because of well-set position and optimum scraping angle, the rotational scraper drains off the impurities from the filter with the help of the gear motor. This avoids the burden of taking apart the cartridge and washing it, which results into successful filtration of the medium. The scraper system contains stator, PTFF scraper and spring, which are designed for automatic cleaning, and especially for the reasonable spring pressure, maximally reducing the cartridge's abrasion.

Features and Benefits

• Because of automatic continuous on-line filtration, the filtration process becomes smooth
• The gear motor runs against the spring actuated scraper and the concentrated solids are drained off by the system, thereby keeping the function of the cartridge well
• PLC control function means differential-pressure cleaning, scheduling of cleaning process and manual cleaning. The differential-pressure is an important parameter for operation and can be connected with the central control room
• Validated by practice, this filtration process is highly effective and using the wedge cartridge, it can be easily cleaned with less abrasion, and
• In many fields, this filter can replace the traditional filters like sand filters, filter press, etc.
• Auto back flush self-cleaning filters have wide applications, including: domestic water supply, tooth paste, reverse osmosis, glycol, softening, cooling water, ion exchange, reclaimed water, oil field, ground water, paint and inks, surface water removal, solvents, boiler backwater, chemicals, swimming pools, latex, landscape water, adhesive, green spray, lubricants, agriculture irrigation water, etc.

(Filter Concept Pvt Ltd, Ahmedabad. Tel: 079-27541602, 27540069. Fax: 91-79-27540801. Email: sales2@filter-concept.com)