University of Khartoum

Nelson Complexity Factor of Delayed Coked Unit

Nelson Complexity Factor of Delayed Coked Unit

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Title: Nelson Complexity Factor of Delayed Coked Unit
Author: Mustafa, Mustafa Elwasila Mohamed
Abstract: Delayed coking is a thermal process in which the vacuum residue from crude distillation is heated in a furnace then confined in a reaction zone or coke drum under proper operating conditions of temperature and pressure until the non-vaporized portion of the furnace effluent is converted to vapour and coke . Nelson Complexity Index (NCI) is a measure of secondary conversion capacity in comparison to the primary distillation capacity of refinery. It is an indicator of the value addition potential of a refinery. The objective of this thesis is to increase Nelson complexity index of delayed coked unit which leads to increase Nelson complexity factor of Khartoum Refinery Company , because a refinery with a high Nelson Index can produce more oil and gas products so that create opportunities for increasing the gross margin . Khartoum Refinery Corporation (KRC) uses two types of crude , the first type is Nile Blend which a light crude oil with minimum sulfur compounds and high pour point which indicates high wax content , and the second type is Fula Blend which a heavy crude and low pour point . For Nile Blend standard equipments are used , such as crude distillation unit , catalytic cracking , and the like . Being poor Blend called " opportunity blend " Fula Blend is refined using a complex equipment which has no standard NCI . In this work Fula Blend refinery equipment are modeled and complexity coefficient are estimated according to reactions mechanism . The complexity coefficient made the estimation of NCI . KRC using this model is found to be (16.39) , this NCI rank KRC as a complex with deep conversion refinery. It is recommended that complexity index of others unit of Petroleum refinery should be taken under the study to check NCI for it, specially reactions mechanism to obtain the optimum Nelson complexity factor of KRC.
URI: http://khartoumspace.uofk.edu/123456789/27119


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