Risks minimised

Safety heat exchangers in polysilicon production Published in "Chemietechnik" - May issue 2017 The production of highly pure polysilicon for photovoltaic systems is a sensitive chemical process, through which an accident can happen if the media are mixed. To prevent this, special safety heat exchangers have been developed to ensure the required safety of the systems as process temperatures change. The manufacture of polysilicon results in the creation of different silane compounds with extremely high chemical reactivity. Mixing these silane compounds with fluids can lead to an accident. Safety heat exchangers have metal tubes to conduct heat during process temperature changes to reduce the risk of such incidents. The particularly good metallic contact allows efficient heat transfer without requiring fluids to transfer the heat. High thermal efficiency keeps the design of tube bundle heat exchangers compact, saving both installation space and material costs. With Funke safety heat exchangers, the inner tube has a pyramid-shaped outer structure, allowing about 75% thermal conductivity after expansion compared to the single tube design.

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