Heat Exchanger Station at Rødkærsbro District Heating Plant

PTI A/S has constructed and delivered the heat exchanger station that extracts heat from wastewater discharged from Arla Foods Rødkærsbro Dairy.

The design and planning were carried out in close collaboration with the district heating plant’s own project management and other suppliers (PlanEnergi, Alfred Preiss, and MITA Teknik).

The design emphasizes a compact, logical, and streamlined structure with good access for service.

Rødkærsbro District Heating Plant purchased the heat exchangers, building, and automation themselves. PTI was responsible for purchasing the remaining components and for the dimensioning and design of the piping system.

The wastewater contains small amounts of organic/inorganic substances and microorganisms, so it is expected that the heat exchangers will become dirty over time. A dirty heat exchanger has poor heat transfer and thus poor operational economy.

Dimensioning

To ensure that the exchanger station can handle the desired amounts of wastewater and thermal water without unnecessarily large pressure drops, PTI has dimensioned and calculated pipe dimensions.

Consideration was given to requirements from the dairy’s treatment plant as well as from the heat pump station.

The cleaning system (CIP system) is connected to the wastewater pipes based on known principles, allowing for efficient cleaning while considering operational costs, time consumption, and investment in equipment.

Design

Based on PTI’s solid expertise in constructing process plants, the facility is designed with a compact structure that is still logical and easy to overview. A key factor in the design is to ensure good access for service and maintenance.

PTI is independent of component suppliers. Components were chosen in collaboration with the customer and based on their preferences. Thus, PTI contributes to keeping the size of the necessary spare parts inventory to a minimum after the project is completed.

Manufacturing/Assembly

PTI’s expertise in manufacturing and assembly lies predominantly in the production of discrete systems, which can be built in our own workshop. Once the system is completed, it is moved to the customer’s construction site and connected on-site.

Thus, the manufacture of the process equipment could begin before the building was completed, reducing the total construction time.

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