Energy optimization and improving efficiency monitoring in Sisak Oil Refinery (RNS)

CATEGORY: ENERGY MANAGEMENT
MOL Scientific Magazine
Young Engineers Programme, Special Issue, 2011
Energy optimization and improving efficiency monitoring in Sisak Oil Refinery (RNS)
Almir Sedić dipl. ing.
INA D.D. Zagreb, Sisak Refinery, Energy & nets management
almir.sedic@ina.hr
Abstract
An oil refinery requires considerable energy for production, transport, product storage and additional needs. ‘Energy & nets management’ and ‘Production’ divisions within Sisak Oil Refinery (RNS) are closely associated. Since both their capacity and efficiency are extremely interdependent, there is an opportunity for detailed optimization of the oil refinery as a whole.
The internal power plant ‘Energana 2’ is an integral part of ‘Energy & nets management’ division. Due to its size and installed power, it has a notable effect on production.  It is the main power source, and practically the only power source in the new part of the refinery. The power plant produces high pressure (HP), middle pressure (MP) and low pressure (LP) steam for different levels of production, as well as electricity.
The current ‘Energana 2’ monitoring and management system was upgraded in 2008 (based on the PCS7 Siemens system), which allows for notably improved possibilities for monitoring of system parameters. The monitoring and management system for the 30 MW turbo-generator (TG-30 MW) was finished in 2007 by Siemens. Appropriate equipment for efficiency monitoring of the power plant and the refinery as a whole was never installed. Since this presents a significant problem, the possibilities for improvement of efficiency monitoring will be analyzed herein.
‘Energy optimization model’ is used in everyday production and optimization in Sisak Refinery. As a result of optimum production by modelling saving has increased for about 10-20% or 200,000- 400,000 Euro/year, depending on refinery energy demand. Model is completely developed with ‘Energy and nets management’ own resources. Savings achieved without capital investment. 
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