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Filtration of cooking oil in doughnut production

Automatic filters from Filtration Group Industrial ensure that foodstuffs are free of foreign particles. They also keep storage tanks and machine components clean. In the filtration of edible oil, FG filter systems achieve excellent separation rates even at low temperatures. Filtration Group Industrial’s customer is a large bakery, one of the largest and most modern bakery production facilities. Donuts are produced on two large production lines and deep-fried in cooking oil during the manufacturing process. Residues of sugar and dough remain in the oil. Since the oil is reused in a circuit and heated by a heat exchanger, there is a risk that too large particles in the residues will block the heat exchangers. The service life and quality of the oil is considerably reduced if the particles are not filtered out of the oil.

Challenge

The oil to be filtered flows through the filter element from the inside to the outside. This causes problems with pariticle removal, so that the filter often had to be opened and cleaned manually. During filtration, the oil has a temperature of approx. 170 °C, posing risks and hazards for employees and the environment. If the filter were opened, the oil would spread. Filtration Group Industrial created a duct connection for this application with two valves and a pipe in between. When the differential pressure is reached, the filter is cleaned and the upper valve opens. Subsequently, the lower valve opens and the oil can flow out without great pressure.

Technical data

  • Temperature: max. 180 °C
  • Viscosity: 5 – 10 mm²/s @ 170 °C
  • Product: cooking oil
  • Particles to be separated: sugar and dough particles
  • Flow rate: 49 m³/h

Solution statement

  • Filtration Group Industrial has offered an automatic filter type AF 7383 with two vertically connected filter elements for this application. Stainless steel filter housing
  • Additional level of safety for people and the environment thanks to a control bos with level gauge and alarm function
  • Customer gradually increases the concentration of partciles to be removed from the oil circuit to reduce the loss of usable oil
  • Cleaning of the filter element when differential pressure is achieved, without opening the valve during each cleaning cycle

Customer value

  • Cost saving by reduced loss of oil, less spare parts used as well as reduced cleaning of heat exchanger
  • Less manual handling delivers a working filter system that automatically cleans itself
  • Reduction of downtime: FG automatic edge-cleaning filter keeps the oil circuit clean and removes particles that could block the heat exchanger
  • Possible multiplication targets: big industrial producers of bakery products using any kind of oil

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