Neste Oy has been working since 1970 to improve the economics of refinery operations by reducing energy usage. Since 80s the tool has been Process Integration with Pinch Technology. Today studies show, that Neste Oy's Porvoo refinery is in terms of energy use the most advanced refinery in Europe.

Neste has developed the Porvoo refinery to meet the most restrictive environmental requirements. An energy saving target is part of the refinery development program towards environmentally better products manufactured with less emissions.

In this paper a brief discussion of the Total Site Analysis of Neste Porvoo refinery is given. The refinery has more than 30 process units and several boilers for utility production. The analysis showed that it is possible to reduce primary steam production by 20% with a better integration of processes and utility systems. 1. GENERAL The environmental aspects in refinery operations have for a long time affected the refiner's investment policy. The quality of oil products has been discussed and products like unleaded and reformulated gasoline specifications have been developed. Locally for the production plant and tank farm operations the refineries have met tightening environmental requirements for water and air quality.

In this respect with better technology and with more stringent emission requirements e.g. Sulfur emissions from refineries have decreased dramatically during some ten, twenty years.

Saving of energy is not only an economic question.

The trend to use energy more efficiently has to be understood as a long planning target to decrease refinery emissions. Modern refineries are using 5-10% of the feed hydrocarbons for generating the energy used for processing at site. The savings in energy use will directly decrease the refinery's CO, NO, and Sulfur emissions.

There is no simple answer to the question on how refineries differ with respect to energy use. A refinery consists of complex process units and are not normally similar to each other. They all seem to be somehow different. Even in cases when the process units have the same designer and the same licenses, the units may be different; the units may be designed for different feeds or the design is technically more or less developed. The local conditions may differ and they will affect the optimum design (air cooling, cooling water temperature etc.). Economical criteria for the different designs also affect the design.

Neste Oy (Neste) has been working since 1970 to actively improve the economics of refinery operations by also taking into consideration environmental aspects of energy use. This long time policy shows today that Neste's Porvoo refinery is in respect of energy use one of the mos

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