Eurotherm Abstract
Human beings are melting glass for almost 5000 years and for most of that period that has been done by using wood as a heat source. Around 1850 we start using fossil fuels and it looks like humanity will manage to use it all up before 2200. Although we still have some generations to go before that will happen it seems that we are coming close to the point where renewable energies are becoming cheaper than fossil fuel energy. Last year we already witnessed that happening in parts of Europe already. Next to the environmental advantages of using renewable energy there are even more advantages to all-electric melting.
This lecture will try to cover the todays’ technology of innovative power supply systems that we made available to the furnace designers. Today’s electrical furnace boosting power supplies need to become energy efficient, highly flexible, real-time controllable, process intelligent, molybdenum and tin-oxide friendly, achievable and standardized. Old fashioned oil filled stepped and variable transformers don’t meet does requirements anymore and therefore we have designed solid state based power supplies that meet the requirements of new all-electric furnace designs. The lecture will cover efficient phase angle and well as load managed burst firing techniques in single, dual as well as in three phase configurations next to cathodic protection and flexibility capabilities. It intends to stimulate glass manufactures to re-thing their todays melting technology and start to consider “all-electric” melting in near future.

 

Celsian Glass & Solar B.V.

Furnace integrity can be influenced by many factors including the furnace atmosphere and combustion operation. As most furnaces rely on the combustion of natural gas or fuel oil as their main heat source, the combustion efficiency is an influential factor regarding energy consumption, emissions levels and furnace lifetime.
Increasing furnace lifetime is often possible by decreasing the potency of refractory corrosion of the furnace. In the combustion space two types of refractory corrosion can be identified: mechanical and chemical corrosion. The first type is introduced when flames are hitting the refractory, increasing temperatures locally. This can normally be minimized by visual inspections and optical temperature measurements of the refractory. The second type of corrosion (chemical) is harder to determine and is influenced by several factors including the burner set-up. A suboptimal set-up can lead to severe carry-over, increased evaporation of volatile species and local high concentrations of CO in the combustion space. By measuring local concentrations of several components in the combustion space the burner set-up can be optimized in order to decrease the potency of refractory corrosion. As a result the lifetime of the furnace can be extended and less hot repairs are needed enhancing the furnace asset.

The Society of Glass Technology is a non-profit making organisation Registered Charity Number 237438
Society of Glass Technology
9 Churchill Way,Chapeltown Sheffield S35 2PY, UK
Tel: +44(0)114 263 4455 Fax: +44 871 8754085
e-mail: info@sgt.org

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