Fruit juice is an agricultural product that is well established in the world market and should be sustainable in terms of cultivation, harvesting, preparation and distribution. 2018 generated a production volume of 45.4 billion litres, which is expected to increase to 50.6 billion litres by 2024.
Since there are several processes involved in extracting the juice, from picking the fruit to the final packaging, the process requires large amounts of electricity and heat energy. exodraft’s technologies reduce energy consumption and supply part of the energy required by reusing waste heat.
After extracting and filtering the fruit juice or concentrate, the juice is pasteurized and thus kept enzyme- and bacteria-free. The pasteurisation process, which usually takes place at temperatures around 100°C, allows for recovery of some of the heat.
How heat can be recovered from a particular process depends on the manner of production, as it can be done at different stages of the fruit juice production. Flash pasteurisation of juice after extraction or during packaging and the necessity of keeping the juice warm during the process offer many opportunities to recover heat.
Heat recovery systems from exodraft can be used to recover waste heat when the pasteurisation process for a given industry is properly analysed. If the fruit juice undergoes a cooling process during packaging or storage, this will be another obvious insertion point for heat recovery in the same process.
exodraft’s team can analyse the production processes and the system’s required heat input/output, so that it can be clarified whether implementing heat recovery from the pasteurisation process will be a financially sound decision.
Pasteurisation is the heating of comestibles to a given temperature for a limited period. The thermal energy for the process is usually generated via a type of boiler. Gas, oil, wood, or coal-fired boilers are prevalent in the industry, as they, to a greater or lesser extent, are cost-effective.
Boilers are connected to chimneys, which are 100 percent dependent on a suitable and stable chimney draught. Mechanical exhaust fan technology / chimney draught from exodraft ensures that the boiler operates in optimum conditions regardless of all internal and external variables.
The correct chimney draught leads heat energy through the chimney naturally. When exodraft’s solution has secured the draught, the chimney is no longer dependent on heat-generated airflow as a propellant, and it is now very advantageous to recover waste heat from the flue gas before it is released to the outdoor environment.
The recovered energy can be used in the pasteurisation process, or for numerous other purposes of heating or cooling. The possibilities for use of the recovered heat are limitless: cleaning, bathing water, heating of office / warehouse / plant, etc. Alternatively, the heat can be sold directly to the district heating system.
exodraft’s team of experts are happy to participate on-site and analyse the overall extraction process with the aim of capturing the waste heat from the pasteurisation process and recover the heat from the source (the boiler).
With this in mind, an overview is established of how best to reduce consumption of thermal energy and optimise the production process by, among other things, installing sensible and proven heat recovery technologies, which are also easy to use.