ELECTRIC OVEN FOR HIGH-QUALITY GLASS PRODUCTION

Ziel

To develop and build an electric oven and a conditioning plant to produce high-quality glass insulators for electric lines. Modern electric lines operate on DC and require higher quality insulators compared to previously used AC.
The work done until 31 January 1987 has essentially been :
- bibliographical research concerning the conception and technology of electric glass furnaces, the refractories used, the electrodes and their electrical supply, the methods of regulation and the recent mathematical modelisation trials.
- preliminary analysis of the refining process adapted to electric furnaces for insulators.
- the main lines of the research on the conception of the furnace.
- definition of the detailed research on the conception and the setting up of the corresponding planning.
- introduction of measures of electrical conductivities of different types of glass.
During the six months to August 1987, the work concerned the following;
- Determination of the melting conditins of the batch layer,calculations were carried out using the mathematical model of the meltingof the batch layer established during the previous six months. Laboratory testswere then undertaken to specify certain parameters which stood out as being important in the calculations.
- Experimental characteristics concerning the finishes of different glasses and the digesting of stones. Tests were performed which consisted of charging simultanesously about twenty platinum cupels filled with different glass samples, and observing the transformation of these samples according to the time at different temperature levels of the furnace.
- Application of calculations for anticipating the wear on the walls of the 30 T/Day melter. These calculations show that for er 1711 refractories with well insulated walls the difespan will be 2.5 yaers.
For er 2161 refractories with well insulated walls the lifespan will be about 5.2 yaers, however the glass will be coloured by chrome oxide.
- Theoretical parametric study ofthe electrode system of a 30 T/Day melter.
- Project studies of the 1 M3/Day test melter, the results from these two studies suggest that the test melter shouldhave the following characteristics; a surface of around .0.8 M to 0.9 M per side. A depth approaching that of the industrial furnace. Four electrodes of 20 MM diameter. This would correspond to ten electrodes of 50.8 MM diameter in a full size melter.
- Measurement of electric conductivities of glasses and refractories at high temperatures.
The equipment is to be installed at the contractor's plant in Saint-Yorre, and will consist of :
- an oven and its electricity supply for the production of high temperature melting glass
- a conditioning plant to refine and cool the high-quality glass
- a monitoring system to control the raw material and energy supplies and to ensure the safe operation of the plant.
The 20 T/day oven will be developed following trials with a vertical electrode pilot oven (1 T/day) built in refractory materials.
The conditioning equipment has to cool the glass to the temperature required for refining, and on-feeding into the insulator production line. The refining step lasts from 12 to 24 hours during which the glass temperature has to be maintained constant. Inclusion of particles must be totally avoided as they destroy the dielectric properties of the glass.
The monitoring system will regulate with microprocessors the supply of raw materials, heat and cooling needs. The system will also analyse the chemical homogeneity, the mechanical properties and the particle and bubble content of the glass produced, as well as glass level, temperatures and energy consumption.

Programm/Programme

ENG-ENALT 2C - Programme (EEC) of demonstration projects relating to the exploitation of alternative energy sources and to energy saving and the substitution of hydrocarbons, 1983-1985

Thema/Themen

2.1 - ELECTRICITY

Aufforderung zur Vorschlagseinreichung

Data not available

Finanzierungsplan

DEM - Demonstration contracts

Koordinator

CERAVER SA

EU-Beitrag

Keine Daten

Adresse

USINE DE SAINT-YORRE
SAINT-YORRE
Frankreich

Gesamtkosten