Improvement in Reducing Production of Green Coke to Achieve Optimum Margin at the Dumai Refinery

The Dumai Refinery’s current condition is that some products, such as Green Coke, sell far below the price of raw materials/crude oil. However, with increasingly stringent fuel regulations, the Dumai refinery must also be able to produce environmentally friendly products and meet government and International Maritime Organization (IMO) regulations. In addition to the problem of green coke products, which are far below the price of crude oil, there is damage to the green coke lifting facility and the limitation of the raw material tank of the unit that produces green coke, making this issue a priority to be resolved. This final project can be used as an alternative operating pattern at the Dumai Refinery, where higher margins and lower green coke products can be achieved. A simulation will be conducted using the GRTMPS (Generalized Refining Transportation Marketing Planning System) tools to resolve this Green Coke issue. Data retrieval will be carried out through secondary data based on RKAP 2025 and other supporting data. This simulation with GRTMPS uses six cases with variations in crude composition and alternative products that can meet government and IMO regulations, namely MFO LS and LSFO. Considering case selection based on maximum tank capacity and export cargo products that buyers/customers can accept. Later, it can be compared which case produces the highest margin and the lowest green coke production. Variable constraints are also determined for this simulation, namely the processing unit’s capacity limitations and product production capabilities’ limitations. Later, the case will be the best alternative to be implemented to solve the Green Coke problem. Based on the simulation results, the case with a crude composition without crude Duri and LSFO production of 200 MBbl is the best case, producing the highest margin and the lowest green coke product compared to other cases. The minimum turndown ratio in the delay coking unit (DCU) must be adjusted.