Improvement of screw press production in palm oil using fuzzy logic system
A screw press machine is used to compress the fruit mash between the main screw and the travelling cones to extract the palm oil. The position of the cones against the discharge end of the press cage determines the pressure. The pressure controller is an important factor in determining the oil loss...
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| Format: | Thesis |
| Published: |
2008
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/819/ http://eprints.uthm.edu.my/819/1/24_Pages_from_IMPROVEMENT_OF_SCREW_PRESS_PRODUCTION_IN_PALM_OIL_MILL_USING_FUZZY_LOGIC_SYSTEM.pdf |
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| Summary: | A screw press machine is used to compress the fruit mash between the main screw and
the travelling cones to extract the palm oil. The position of the cones against the
discharge end of the press cage determines the pressure. The pressure controller is an
important factor in determining the oil loss and nut breakages. A conventional control
system which is the band control system, uses a kilowatt meter as a controller in
adjusting the press cage pressure. However, the screw press machine can be improved
in order to reduce the oil loss and nut breakages. Not much researches has been
conducted on reducing the nut breakages as well as oil loss. Therefore, the objective of
this study is to minimise the oil loss and broken nuts. The objective can be achieved
through upgrading the screw press machine and the use of fuzzy control system. During
the course of this research project, the hydraulic system of the screw press machine was
upgraded by utilising the proportional pressure relief valve. A current transducer was
used to measure the motor current load. A ladder diagram program and fuzzy logic
algorithm were written and downloaded into the programmable logic control to regulate
the press cage pressure. For comparison purposes, a band control system and fuzzy
control system were implemented in the control environment. The performances of both
systems were compared in a number of tests. The first test was the oscillation of motor
current load with the performance of fuzzy control system that was stabilised at
8.33mA. This is due to the reaction of fuzzy pressure controller in regulating the
proportional pressure relief valve. The fuzzy control system is able to reduce 1.20% of
oil loss compared to tiie band control system. The percentage of the broken nuts of the
fuzzy control system was reduced by 3.55%. This implies that the objective to reduce
the breakages is achieved. Thus, the screw press machine with a fuzzy control system is
found to be significantly more efficient than the band control system. |
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