The intervention consists of the recovery of thermal energy contained in the combustion fumes exiting from two steam generators, one of which is brand new and with a potential equal to 12 t/h in terms of steam production capacity.
The thermal energy contained in the fumes exiting from these generators is used for:
- Preheat the boiler make-up water
- Preheat technological water for continuous washing machines in service in the dyeing department
The replacement of the old boiler with a new one, equipped with an economizer supplied by RENOVIS, which is particularly efficient, allows to obtain a flue gas outlet temperature of around 93 °C with 70 °C inlet water. In the new configuration of the boilers room, considering an average requirement of 7 t / h of steam at the factory, the new high efficiency 12 t / h generator has now priority.
Through an adequate system of smokes collection from the existing chimneys and ducting, it is possible to convey the combustion fumes coming out from both steam generators to a double-staged heat recovery system.
The first stage is connected hydraulically, by means of a recirculation line, to the existing storage tanks of the make-up water. The exhaust fumes are subsequently conveyed to a second stage in order to preheat the feed water of the continuous washing machines. Once again, the exhaust coming out of this second stage is conveyed into a new chimney by means of a suitably sized fan. The plant is also equipped with two circulation pumps and motorized and automated dampers to manage fluids in operation correctly and continuously.
Expected results:
- Thermal energy saving: 4.680.000 kWh/year
- Primary energy saving: 403 Toe/year
- Saving of natural gas: 488.800 smc/year
- CO2 non immessa in atmosfera: 908 tons/year
- Payback intervention: about 48 months
The plant built has been equipped with a monitoring system capable of measuring and historicizing post-intervention consumption. This is essential for the assessment and verification of the energy savings achieved.
The intervention was analyzed, designed and implemented by RENOVIS.
