An operational system model for raw material flow in the sugarcane mlll yard of Mumias sugar company

Abstract

A study was conducted at Mumias Sugar Company to identify the parameters that determine the flow rate of cane into and out of the factory's Cane Yard between November, 1991 and May, 1992. The study utilized current as well as previously recorded (historical) data where available. Statistical analysis was carried out on all the data that was gathered. From the analysis, curves were fitted using the chi-square goodness of fit test. Equations that described the service times of all the unloading equipment in the yard were derived. A computer simulation model of the Cane Yard operations was developed. The model developed was capable of simulating the operations of the factory's Cane Yard. Cane inflow rates, milling rates, stockpile build-up in the yard and the average waiting times of all the trailer types were derived from the model. Simulated and actual Cane Yard parameters were compared. The model was used to determine the possibility of Mumias Sugar Company operating only two daily transportation shifts of 8 hours, while satisfying the daily mill requirements. This was found possible by increasing the hourly delivery rates of basket type trailers so that the majority of the cane hauled into the yard by bundled cane trailers during the first 16 hours of operation is stockpiled. However, the average waiting time for basket type trailers may become the limiting parameter, particularly when there is a mill breakdown.