Vahterus supplied a total of five heat exchangers to a heating plant constructed in 2015. The Vahterus heat exchangers help make the plant more efficient while reducing the plant’s carbon footprint and construction costs.
In 2014, Tampereen Sähkölaitos published a decision to invest in a heating plant to be built in the neighbourhood of Hervanta in Tampere, Finland. The plant is a district heating plant based on fluidized bed technology. The benefits of this technology include the option of using fuels with lower heating value, the most notable of which are timber-based forest processed chips, sawdust and bark. With the new plant, Tampereen Sähkölaitos wanted first and foremost to reduce the use of natural gas in district heat production and, as a result, also reduce greenhouse gas emissions.
Vahterus supplied a total of five heat exchangers of different sizes and capacities to the plant. The most important of the exchangers is the large, approximately 45 MW district heating heat exchanger located between the plant’s boiler water and district heating circuit. The four smaller heat exchangers represent the Compact range. Their applications include internal heat exchanger, bottom ash cooling exchanger, yard heating heat exchanger as well as washer condensate heat exchanger. The smaller heat exchangers are meant to boost the chip-fuelled plant’s own process and reduce the carbon footprint. Plate & Shell heat exchangers are ideal for high temperatures as they have a tight and fully welded plate pack. If a fault happens in the plant, the plant’s boiler circuit may come down quickly, which strains gasketed and soldered heat exchangers. Vahterus heat exchangers, however, require no gaskets, so they are almost entirely maintenance-free.
Thanks to their reliable structure, several energy companies have chosen a Vahterus heat exchanger as the application to be placed between the boiler water and district heating circuit. Moreover, the heat exchangers can be installed directly into the process, eliminating the need for intermediate circuits.
Compared to shell & tube heat exchangers, Plate & Shell heat exchangers are considerably smaller and require less space. As such, choosing Plate & Shell heat exchangers can bring the construction costs of the entire heating plant down. The 45 MW exchanger, which is the largest in the Hervanta plant, has already gained positive attention among the visitors to the plant.
“Our visitors have been impressed by the exchanger’s capacity in comparison to its size. It does, after all, take up very little space,” says Kimmo Koivisto, the Production Manager of Tampereen Sähkölaitos.