Journal Title : International Journal of Modern Trends in Engineering and Science


Author’s Name : Akhila Rupeshunnamed

Volume 04 Issue 02 2017

ISSN no:  2348-3121

Page no: 46-49

Abstract – Economy in energy consumption is one of the most critical needs in the present time of high cost and scarcity of energy and will be more so in future. Industries are applying the ‘total energy concept’ in designing new integrated plants having full conservation and self sufficiency in energy and are also expanding and modernizing existing plants to improve energy economy. This paper deals with the optimization of energy consumption in petroleum industries as they rank third in consumption of energy, after chemical and metallurgical industries. The overall energy use in the refinery totals to 6330MJ/t of crude oil, which accounts for 3980MJ/t crude in the main process units and with additional 2350MJ/t crude for non-process consumption. A typical refinery gets 78% of energy from fuels, 10% from steam, and 11% from electricity and l% from cooling water. The refinery will always try to burn the lowest value product as fuel e.g. refinery overhead gases, heavy fuel oil, petroleum coke in addition to natural gas. The cost of energy as percentage of product value is 5-10%. In a typical integrated petroleum refinery, the crude distillation unit handles all the crude in the atmospheric section and 0.46 tonne crude of residue in the vacuum distillation section. Coking unit may include drum coking at about 770-990K and l-2 bar, of the lube fraction from heavy vacuum residual oil for upgrading and related fractionation. Hydro desulphurization unit deals with naphtha and light gas oil and kerosene, similarly catalytic reforming unit works at 720-810K and 20-40 bar catalytic cracking unit at 740K and regenerator at 900Ksometimes refineries also include breaking of vacuum residuum, hydro cracking is omerisation, polymerization of olefins and steam reforming for hydrogen production, so energy loss occurs in a refinery in the form of heat losses like radiation and convection losses, heat loss from outgoing process steam and heat losses in stack gases,defects in major equipment for unit operations and processes in the different units of the refinery such as (1)fired heaters(2)heat exchangers and condensers(3)fractionating towers and distillating columns (4)pumps, compressers, blowers (5)electrical and steam system. Improvements in all these items of equipment can save up to 19.4% of the refinery energy bill.

KeywordsEnergy Conservation, Heat, Petroleum, Equipment, Design, Recovery


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