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Exergy analysis of moisture removal from phospholipid emulsions of vegetable oils in rotary film apparatus

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The article describes the results of exergy analysis and evaluation of the energy efficiency for resource-saving process technology of moisture removal from phospholipid emulsions of vegetable oils in the rotary filmapparatus.The aim was to evaluate technological system in terms of thermodynamic and to compare it with existing analogues to identify the bottleneck and to improve the process of moisture removal. For this purpose a thermodynamic analysis of the moisture removal effectiveness from phospholipid emulsions in rotary film unit was carried out. Thermal and exergy balances of heat and mass transfer processes were calculated and conducted heat and exergy analysis was made. Exergy balance of moisture removal from phospholipid emulsions in rotary film device was carried out by the method according to which it was regarded as a heating system conventionally separated from the environment by a closed reference surface. To assess the effectiveness of moisture removal from phospholipid emulsions heat, exergy and entropy analysis were used. Material flows of the reference moisture removal surface were defined as all exergy conversion took place by the interaction of these flows. Most exergy losses occur due to the irreversibility of the process resulting from phase transformation moisture removal and pressure differential in rotary film unit. During moisture removalfrom phospholipid emulsion of vegetable oils vapor and condensation are removed. Their amount in heat balance is 90.13%, and in exergy balance - about 75.35%. Total exergy losses during moisture removal from phospholipid emulsions of vegetable oils in rotary-film device are 17.4% in the reference surface The proposed process has a higher exergy and thermal efficiency compared with conventional process.

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