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Deodorisation Section
The preheated oil is pumped into the vacuum vessel where it is deareated. This vessel is also capable to level out variations in oil flow to the plant. After deareation the oil is continuously heated in regenerative heat exchanger, utilizing hot oil from the deodoriser. The final deodorizing temperature is achieved in a heat exchanger by thermal oil, which is circulated through an automatically working heating unit. Further, the oil enters the deodoriser where flows continuously through a number of trays via specially designed overflow channels. Each tray is equipped with special oil flow baffles in order to control the flow through the tray and prevent short-circuiting. During stock change, the trays are drained through separate drop valves.
The steam used for - stripping off' volatile matters in the oil is distributed evenly and intensively by separate, specially designed distribution systems in each tray. This way the consumption of steam is reduced to a minimum. Furthermore, the space over each tray is filed with highly efficient baffles designed for minimum vapour velocities in order to give optimum recovery of neutral oil from vapours.
Vapour Scrubbing
In order to recover the fatty acids and other volatile matters in the vapours leaving the deodoriser and to minimize the pollution load in the condensed vapours, the deodoriser is equipped with a vapour scrubber. This unit operates by spraying circulating oil over a special baffle system in the vapour stream. This way the volatile matters in the vapours are condensed and collected with the circulating oil in an intermediate tank. The system is designed in such a way that no condensed volatile matters or ‘scrubber’ oil can enter the deodoriser.
General
The entire plant is designed for continuous operation and requires a minimum of attention. The equipment can be controlled mainly from a central control panel with a large easy to read flow diagram of the process, where all items with electric motors are indicated by stop and running lights. Furthermore, important parameters in the process are supervised by an alarm system with indicating lamps on control panel. The entire operation of the plant can be handled by a single operator.
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