Hellenic starts up rotoform lines

Sandvik has completed commissioning of an end-to-end sulphur solidification and handling system at ­Hellenic ­Petroleum S.A.’s refinery in Elefsis, marking an important ­milestone in a larger environmental upgrading of this major facility. ­Sandvik Process Systems has delivered a solidification solution based on four of its Rotoform® granulation systems, each with a capacity of approx. 300 t/day, while sister company Sandvik Mining and Construction has installed solid sulphur handling facilities, including stacking, storage, reclaiming and ship-loading equipment. The project continues a relationship that extends back to the mid-1980s when Sandvik first installed sulphur granulation lines at Hellenic Petroleum’s refinery in Aspropyrgos.

The objective of the overall refinery upgrade is to give the Greek energy giant the ability to handle different kinds of crude and enable production of ultra low sulphur fuels. Other goals include a significant reduction in emissions together with efficiency enhancements and improved safety conditions. Sandvik’s Rotoform system offers a number of process benefits but for Hellenic it is the inherent cleanliness that is one of its key advantages.

Solidification of the sulphur extracted during refining is carried out on Sandvik’s Rotoform units. These consist of a heated, cylindrical stator and a perforated rotating shell that turns concentrically around the stator, depositing sulphur drops across a continuously running steel belt. The speed of the Rotoform is synchronised with the speed of the belt, ensuring that drops are deposited accurately, consistently and without deformation.

The belt is cooled by water sprayed on the underside and the resulting heat transfer results in rapid solidification of the product. The fact that there is no contact between the molten sulphur and the cooling water means there is no risk of cross contamination and the water can be recycled within the system, again and again.

The sulphur droplets are then discharged as solid, hemispherically-shaped pastilles at the end of the cooling system, and conveyed outside the solidification building to the covered stockpile area. As the refinery is located close to a densely populated area, these facilities have been designed to minimise any impact on the environment. This includes enclosed storage, enclosed conveyor galleries, dust suppression at loading points and the use of telescopic chutes in shiploaders.

The stockpile feeding system uses a belt conveyor with a capacity of 33,5 t/h to feed a distribution system at a height of approximately 20 m. The stockpile has the capacity to house around a month‘s sulphur production, approximately 10 300 metric tons. Two shiploaders have been installed, each fed by a 70 m transfer belt and delivering a combined maximum loading capacity of 70 t/h.



Related articles:

Issue 2013-04

Sandvik Process Systems

Drawing on its many years of experience and know-how in the pastillation of a wide range of molten materials, Sandvik Process Systems has further developed its Rotoform® technology. As a successor to...

Issue 2014-09

The success story of the Rotoform® granulation

Sandvik Process Systems, the inventor of the Rotoform® process (1985), will present the versatility and efficiency of this system in the oil, gas, fertilizer, chemical and food industries at this...

Issue 2010-04


With granulation systems for applications such as foodstuffs, sub-cooling melts, thixotropic, abrasive and corrosive products, Sandvik offers the widest range of process solutions in this field. Two...

Issue 2009-09 Product News

Low-noise and wear-resistant

Sandvik supplies wear-resistant rubber linings suitable for all dumper truck bodies and hoppers used in the mineral processing industry (Fig.). Loading surfaces and rear flaps are subject to extreme...

Issue 2009-05

Fully-mobile crushing station

With the PF300 from Sandvik is now a completely new fully-mobile crushing advancement for on-face mining applications available (Fig. 1). The heart of the PF300 is the Sandvik crushing technology. The...