Demo 4 – LARNAUDIE

Process: Steam production at 170ºC, 8 bar for sterilization and pasteurization.

Site: Figeac

Country: France

Longitude: 2.0372° E

Latitude: 44.5959° N

GHI: 1285 kWh/m2 @35°

Space opportunities: A ground field is expected to host the TVP solar power plant is displayed below. The field is about 5000 m

www.larnaudie.com

Description of the energy scenario

The main processes presenting a heat demand are:

  • Scalding: from 50-52ºC  to 58-60ºC. In the demo site plant, hot water is heated up to 62ºC.
  • De-Feathering: in the demo site plant, steam in used to heat up water to 40-45º
  • Mixing/blending and homogenisation: Vacuum mixers are used, and the temperature shall be kept above 4º
  • Pasteurisation and sterilization: the temperature for pasteurization heating is below 100ºC. In the case of sterilization, the aim is to eliminate viable form of micro-organism that may be present in a preserved food. This can be achieved by moist heat or dry heat. Compared to pasteurization, a heat treatment of over 100 ºC is applied for a period long enough to lead to a stable product shelf-life.

The whole natural gas consumption is around 40 MWh per working day, supposing around 0,8 GWh per mont. The main use of steam generation is about:

  • Cleaning (39%)
  • Scalding (21%)
  • Pot cooking (15%)
  • Autoclaves (14%)

These 4 consumption items represent 79% of the steam generation.

Description of the industrial process and current control

The stage of cooking and curing in the process of raw cured products needs an accurate control of temperature, relative humidity and air velocity. For this step of the process autoclaves and cooking pot  are required. Within SHIP2FAIR, a heat exchanger between the demineralized water tank and the boiler to preheat the water up to 140°C could be added in order to integrate the solar heat.

The current installation is not well monitored with no harmonization of tools. The boiler has only a local HMI allowing to change and see local parameters (pressure and steam temperature). The regulation of the boiler is made onto the steam pressure level: it means that as the pressure drops, the boiler provides more steam. Installation is envisioned during spring 2020.

  • Foi gras and duck meat production

Ship project to be implemented

  • Ultra-high vacuum FTP. Heat will be provided to the process via heat exchangers.

  • Heat Transfer Fluid: Water

  • Net Aperture Area: 1600 m²

  • Gross Area: 5000 m²

  • Peak power: 1040 kW at 140°C-6 bars

  • Gross heat production per year: 1,166 MWhth

  • Yearly global efficiency: 52.8%

  • CO2 savings: 282.6 tCO2eq

  • Heating cost: 4,80 c€/kWh

  • Solar fraction: Average: 12.2% Max. 21 % in July