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Energy saving as Sacmi sees it

1st instalment: kilns

The application of the Kyoto protocol and the effects of the recent energy crisis have highlighted just how important it is to save energy and thus raise machine efficiency to achieve a reduction of machine running costs.
To save energy Sacmi Forni has perfected three energy recovery systems applicable to all the latest-generation kilns:
1. BSR system (Combustion air heated at low temperature)
The combustion air passes through a heat exchanger in the rapid cooling section before being sent on to the burners at a temperature of approximately 100°C.
By subtracting heat from the rapid cooling zone, the exchanger also reduces the volumes needed to cool the material, giving savings in the order of 6%.
2. MDR system (Combustion air heated at medium temperature)
To allow further energy savings in addition to those provided by the BSR system, it is possible to modify the final cooling zone of the kiln.
The air gathered from slow and final cooling areas and evacuated via the duct at a temperature of 100-120°C is intercepted, diverted to the heat exchanger in the rapid cooling zone and then used as combustion air at a temperature of approximately 150°C.
It has been calculated that additional energy savings, with respect to consumption achieved with the installation of the exchanger only, are in the order of 5%.
3. SPR system (Super-heated combustion air)
To obtain further energy savings with respect to the MDR system, it is possible to double up the air expulsion chimneys in the slow and final cooling zones of the kiln.
It has been calculated that the additional energy savings, with respect to consumption rates achieved with installation of the MDR system, are in the order of 5%.


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