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Heat recovery at as part of perfect exhaust air purification.

Exhaust air purification roastery

The situation

Roasting is a way to enhance the taste of food and make it durable. However, whether coffee roasting, cocoa roasting, roasting of nuts and seeds, roasting of flours and malts, sugar couleur roasting, vegetable roasting, grain roasting – the desired aroma and the ideal degree of roasting are usually accompanied by a high level of exhaust air pollution and odor pollution.

These pollutants can be, for example, VOCs, odor-bearing aerosols or other particles and, according to TY air, must be significantly reduced so that they can hardly be perceived in the environment.

The problem

Often, conventional exhaust air purification processes such as catalytic afterburning are used for exhaust air purification in roasting plants. Although this achieves a high separation efficiency, it has a high consumption of fossil fuels. Thermal afterburning is thus very cost-intensive and also has a negative impact on the company’s eco-balance and CO₂ footprint.

Another problem is that this thermal treatment of coffee beans, which takes place in discontinuous operation, generates emissions in two substeps, the roasting process itself and the subsequent cooling with fresh air. These emissions consist of a variety of aromatic-smelling organic compounds, which are measured as VOC content or odor units. The exhaust air is contaminated with oily and pasty aerosols, vapors, particulates, and other contaminants. In addition to the exhaust air pollution caused by particles, aerosols, other solids or liquids, roasting plants are confronted with the strong odor pollution of the production exhaust air.

The solution

The exhaust air purification system from oxytec here consists of the combination of heat recovery, scrubber, UV/ozone system and final activated carbon as storage reactor. This reduces odors and achieves specified clean air values.

Subsequently, the exhaust air flows into the heat exchanger. Here, oxytec relies on heat exchangers based on air-air or air-water.

The recovered thermal energy can be fed back into the production cycle or used for other applications.

The result

The system reduces odors and VOCs by over 95%.

The product


Air Air Heatrecovery
Air-to-air heat recovery for the use of hot exhaust air


Clean Exhaust Air
UV ozone exhaust air purification system to meet TA Luft requirements

The advantages

  • Extensive neutralization of VOCs and odors
  • Compact, lightweight and quick to set up solution
  • Low maintenance costs
  • Low energy costs
  • Compliance with TA-Luft

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