• Case History RENOVIS Energy: Heat recovery in a textile industry

Case History RENOVIS Energy: Heat recovery in a textile industry

The intervention consists in recovering the heat contained in the fumes coming out of three steam generators in order to:

  • Preheat the boiler feed water;
  • Preheat the make-up water for the boilers;
  • heat diathermic water for winter microclimate use;
  • Preheat the water used for the process washings.

Before the intervention, no recovery of the thermal waste had ever been implemented in the plant configuration of the thermal plant. A single 3-stage heat recovery system was therefore built for smoke/water heat exchange:

  • ECO (centralized economizer) heats 7.150 l/h of food water from 80 °C to 120 °C
  • RC2 (second heat recovery stage) heats 2.700 l/h of make-up water from 15 °C to 60 °C
  • RC3 (third heat recovery stage) heats closed-circuit diathermic water from 35°C to 55°C.

The third stage of heat recovery (RC3) is also used for the preparation of hot water for production, precisely for process washing. The fumes are cooled from about 195 - 230 °C (depending on the instantaneous thermal load of the boiler) to about 40 °C. Before release into the atmosphere, the condensate produced is separated, treated and disposed of.

Results obtained:
  • Thermal energy saving: 3.517.920 kWh/year
  • Primary energy saving: 302 Toe/year
  • Saving of natural gas: 362.000 scm/year
  • CO2 not released into the atmosphere: 715 tons/year
  • Payback intervention: about 36 months

The new system has been equipped with a monitoring system able to measure and historicize the post-intervention consumption essential for the final balance and the verification of the energy savings achieved.

The intervention has been analysed, designed and implemented by RENOVIS.
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