Mars - Pet food industry

MARS aims to make all their production and processes "Sustainable in a Generation", by eliminating fossil fuel energy and greenhouse gas emissions, minimizing impact on water quality and availability and mitigating the impacts of waste by 204011. For the pet food production 50+ similar drying lines are currently using fossil fuel as energy carrier. In 2014, Mars made a significant step towards achieving carbon neutral operation by announcing a massive 118 turbine wind farm that provides electricity from renewable sources. High temperature heat pumps and MVR can use this renewable electricity to supply the necessary drying energy for our production, hereby substituting fossil fuel by 100%. The technology can be implemented and used in other processes, since steam is used in other operations as energy carrier. A further advantage of superheated steam drying is the possibility to reduce pollution, since the condensed steam can be treated in a conventional waste water treatment.

Process description:

This demonstration will take place in the pet food producing industry and will be installed in the production and drying of kibble or dried fodder. The useful supply temperature of the novel heat pump system will be around 150 to 180 °C, the heating capacity will be around 500 kW.

Kibbles (raw material) from the extruder are fed into the drying chamber and transported through a superheated steam atmosphere by belts. The drying chamber is open at the bottom and steam pressure is, therefore, close to ambient pressure. The product is dried due to the superheat of the steam and additional vapor is hereby produced. The steam in the drying chamber is cooled down from around 150-180 °C (inlet) to 110 °C (outlet) during drying, but the superheated condition is sustained (no condensation). The dryer is a prototype with a capacity of 500 kW. For full-scale industrial application the system must be up-scaled to a capacity of 1200 kW. The specific energy consumption of the current system is between 800 and 900 kWh per ton of removed water.

Follow us