Reduced CO2 emissions
The benefits of using Calumite to reduce CO2 emissions are two fold, with both direct savings through reducing process CO2 emissions and indirect savings through reduced emissions associated with fuel combustion.
Process CO2 emissions
Calumite provides CaO and MgO in a glassy form, reducing the amount of limestone and dolomite in the batch and therefore reducing the CO2 emissions associated with the decomposition of these carbonates.
The levels of CO2 reduction are significant
In amber glass the use of 16% amber can reduce process CO2 emissions by around 22%. In green glass, 13% Calumite would reduce process CO2 emissions by around 16% and in flint, 6% Calumite would lead to a 9% reduction.
Looking at it another way, by considering the amount of limestone and dolomite that would be required to provide the CaO and MgO provided by 1 tonne of Calumite it is calculated that for each tonne of Calumite used, over 400 kg of CO2 emissions are saved.
In addition to this, the reduced energy consumption through the use of Calumite results in reduced CO2 released during combustion, whether the furnace is gas or oil fired.
This can equate to a further 200 to 300 kg CO2 per tonne of Calumite used, giving overall 600 to 700 kg of CO2 saved for each tonne of Calumite used.
Reduced NOx emissions
In an air-fired furnace, with approximately 70% of the atmosphere being nitrogen, the rate of NOx formation increases exponentially with temperature. Therefore the reduction in furnace crown temperatures that can be achieved by using Calumite due to its faster, more efficient melting, can have a major impact on NOx reduction. The implementation of Calumite can lead to a 30°C reduction in crown temperature, which equates to a 10% reduction in thermal NOx.