Sulfur Solidification Sandvik’s New Rotoform System Increases Capacity in Sulfur Solidification

Editor: Dr. Jörg Kempf

Sandvik Process Systems has announced a new Rotoform sulfur solidification system capable of delivering a throughput 33 percent greater than that of its existing high-capacity Rotoform HS model.

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The significant extra capacity of the new Sandvik Rotoform HS2000 is made possible by the use of a wider depositor and steel belt cooler; instead of the 1500 mm width of the standard RFHS model, a 2000 mm belt is used to boost throughputs from 300 t/d to 400 t/d. (Picture: Sandvik)
The significant extra capacity of the new Sandvik Rotoform HS2000 is made possible by the use of a wider depositor and steel belt cooler; instead of the 1500 mm width of the standard RFHS model, a 2000 mm belt is used to boost throughputs from 300 t/d to 400 t/d. (Picture: Sandvik)

“The Rotoform HS was launched in 2005 to meet demand for greater solidification capacity,” says Hans-Georg Pohle of Sandvik Process Systems. “Since then it has been specified for some of the world’s largest refinery projects including installations in Bahrain, India and Greece.”

According to Pohle, the HS2000 is a logical progression of this success. The move to cleaner fuels and stricter environmental legislation means more sulfur is being extracted these days and operators need to be able to process this as cleanly and efficiently as possible. The introduction of the HS2000 model at the top end of the Rotoform portfolio represents a significant extension to Sandvik’s solidification ranges.

No Risk of Cross-contamination

Like every Rotoform since the launch of the first model 30 years ago, the Rotoform HS2000 is based on indirect cooling via a steel belt so there is no risk of cross-contamination between the sulfur and the cooling medium. The system works by feeding molten sulfur to a heated cylindrical stator, where a perforated rotating shell deposits droplets of sulfur across a continuously running steel belt. The speed of the depositor is synchronized with the speed of the belt, so the drops are deposited accurately and with the regularity of shape and size necessary to achieve “Sudic” Premium Product specification.

As the steel belt travels along the system, cold water is sprayed against the underside and heat is transferred through the steel belt to the cooling water. By the time they reach the end of the line, the droplets are solidified into 100 percent premium quality monogranules 2–4 mm in diameter.

No Dust or Vapor Emissions

With virtually no dust or vapor emissions and no need for subsequent screening, re-melting or dewatering, this is a process with minimal environmental impact and one that more than satisfies all current international legislation. High reliability and scheduled preventative maintenance delivers availability of more than 8400 hours per year. Another advantage is the ability to operate multiple process lines individually side-by-side to cope with varying throughput requirements.

“Alongside the clean efficiency of the system,” continues Hans-Georg Pohle, “the success of Rotoform solidification is down to its ability to deliver a premium-quality product with high uniformity and stability. No other process delivers the same outstanding product size distribution, low dust content and negligible moisture — all important factors in determining whether a product finally sells or not.”

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