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Blocksim 7
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Contents. Oil Refinery System Consider a simplified reliability block diagram (RBD) of an oil refinery, as shown next. The RBD consists of a block representing the crude oil supply (Crude Oil Supply block) and two pumps (Pump 1 and Pump 2 blocks) used to feed the crude oil to the furnace (Furnace block). The crude oil from the furnace is sent to the fractional distillation column (Distillation Unit block) to separate out different fractions. For simplicity it is assumed that gasoline is the only main fraction under consideration.
Some gasoline is also obtained from cracking of higher fractions (Cracking Unit block). All units processing gasoline after the fractional distillation and cracking are represented by a single block (Gasoline Unit block). Gasoline and the other fractions (Other Fractions block), after going through their respective refining processes, are sent for storage. Storage units for the whole refinery are again represented by a single block (Storage block). RBD for oil refinery The purpose of the Crude Oil Supply block in the diagram is to represent the time-varying throughput as the oil refinery goes through its three operational phases of Start Up, Normal Production and Shut Down. This block is therefore not assigned any failure properties and is set to ignore backlog. The two pump blocks are used to represent two supply lines of crude oil (along with their respective components such as pumps and valves) to the refinery furnace.
One of the lines is assumed to supply 70% of crude oil while the other line supplies the remaining 30%. This is achieved by selecting the Weighted allocation across paths option for the throughput simulation settings for the Crude Oil Supply block and assigning throughput values of 70 and 30 units per day respectively for the Pump 1 and Pump 2 blocks. It is assumed that gasoline is obtained as 45% of the crude oil supply. Thus a throughput of 45 units per day is assigned to the Gasoline Unit block. The remaining 55% throughput is assigned to the Other Fractions block.
The unequal division of throughput across the two paths is achieved using the Weighted allocation across paths option for the Cracking Unit block. Both the Gasoline Unit block and the Other Fractions block are required to remain operational for the refinery to function. Thus a 2-out-of-2 node is used to represent this series configuration. The Storage block is assumed to have no failure or repair properties. Phases and Throughput The phase diagram is shown next.
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Shut Down phase properties The major annual overhaul is represented by a maintenance phase, which is the fourth and last phase of the phase diagram. In this phase, all components are preventively maintained and failed components, if any, are subjected to repairs.
Except for the two pump blocks, it is assumed that no blocks can be repaired during the operational phases. Any system failure of the refinery during any of the operational phases is considered to lead to an immediate overhaul of the refinery. Thus the failure path for all the operational phases leads to the Maintenance phase. Simulation Objective A phase diagram simulation is run to estimate availability and percentage of gasoline throughput obtained from the refinery for a one-year period. (The percentage of gasoline obtained from crude oil over the one-year period may be determined by dividing the total throughput of the Gasoline Unit block to the total throughput of the Crude Oil Supply block. Ideally this percentage should be 45%, but due to failures of the refinery the actual throughput percentage obtained would be less.) The following failure and repair properties (in days) are assumed for the different blocks used in the RBD.
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