The whole process of oil refining
Oil refining is a complex process involving multiple disciplines such as chemistry and physics. Different refining methods are suitable for different oils and situations, and plate heat exchangers play a role in the washing and drying steps.
Crude oil filtration
Pre-coat the blade vibration filter with a diatomaceous earth filter layer to filter out the solid impurities and part of the colloid in the crude oil to obtain filtered rice bran crude oil.
Phosphoric acid degumming and light alkali refining
Inject the filtered rice bran crude oil into the crude oil tank, heat it to 40°C to melt the wax fat in the oil evenly, pass through the crude oil filter, use the crude oil metering pump to pump into the plate heat exchanger to raise the oil temperature to 80°C, put it into the phosphoric acid tank, use the triple metering pump to add 0.2% of the weight of the rice bran crude oil with 85% edible phosphoric acid, mix it evenly through the centrifugal mixer, enter the acid refining mixing tank for delayed reaction for 30 minutes, then use the hot water pump to add 5% of its weight of 90°C hot water to the rice bran crude oil from the hot water tank, mix it evenly with the centrifugal mixer at the back, add light alkali refining, stir slowly in the alkali refining tank for 20 minutes, make the colloid denatured and condense when it meets water, and use a self-cleaning centrifuge to separate the oil and feet.
Washing and drying
Heat the degummed and alkali-refined rice bran oil to 85°C through a plate heat exchanger, pump 8-10% of the weight of the degummed and alkali-refined rice bran oil from the hot water tank into the oil with a hot water pump, mix evenly with a centrifugal mixer, wash twice continuously with a centrifuge to separate the wastewater and flow into the dirty oil collection tank, delay the separation of the emulsified oil and flow into the oil return tank, and use the oil return pump to return to the crude oil tank for refining, and heat the clean oil after washing with the hot oil from the dryer in the first plate heat exchanger, and then heat the clean oil after washing with the plate heat exchanger behind to 110°C and enter the dryer in a vacuum state to completely remove moisture, and the dried oil is pumped to the first plate heat exchanger for heat exchange, and then enters the lower plate heat exchanger to cool to 50°C and enter the dewaxing precooling tank.
Dewaxing
Precool the washed and dried oil in the dewaxing precooling tank After 40°C, it enters three dewaxing crystallization tanks in sequence, and the oil is cooled to 18-20°C at a rate of 1°C per hour and stored for 6-8 hours to freeze the wax and separate it with two hot-unloading winterization filters to obtain dewaxed oil: the separated wax is melted and stored in an outdoor wax tank, and the separated clean oil is put into a clear oil tank and pumped back to the oil tank for decolorization.
PLATE HEAT EXCHANGER
