MNK Enerji economiser upgrade • 4.6 MW economiser retrofit in a paper waste incineration plant in Turkey. • Replacement of corrosion- damaged PFA-lined steel tubes with Technoform PPS- GR tubes. • Designed for corrosive flue gas operation below the acid dew point, with gas temperatures reduced from 145°C to 88°C.
Retrofit at the waste-to- energy plant Burgkirchen • Replacement of defective glass tubes in a gas/gas heat exchanger with corrosion- resistant PPS-GR tubes and FKM seals. • Retrofit designed for highly corrosive flue gas cleaning conditions, including an acid dew point of around 160°C. • Since commissioning, no tube breakages have occurred, with HCl daily average values below 1.0 mg/Nm³.
Wallstein heat displacement project • Gas/gas heat exchanger retrofit in a sewage sludge incineration plant in Dordrecht, Netherlands. • PPS-GR tubes replaced previously installed PTFE tubes with internal Hastelloy spiral. • System transfers heat from the raw flue gas to the clean gas side after scrubbing, supporting efficient flue gas cleaning without an additional transmission medium.
breakdown mechanisms such as pitting or stress corrosion cracking. At the same time, its resistance to acidic media significantly reduces material degradation, even under continuous exposure below the acid and water dew point. In addition to chemical resistance, PPS-GR offers operational advantages. Its surface properties can reduce fouling tendencies, while its resistance to abrasion improves durability in particle-laden flue gas streams. The material also tolerates thermal expansion and cycling, reducing the risk of cracking or structural failure compared with more brittle alternatives. As a result, corrosion-resistant heat transfer materials enable a new operating window for industrial heat recovery. Flue gases can be cooled to significantly lower temperatures, typically 40-60°C, allowing the recovery of
previously inaccessible sensible heat and, importantly, the substantial latent heat released during water vapour condensation. This increases the usable heat potential and opens new pathways for improving energy efficiency and supporting industrial decarbonisation. System integration: Recovering heat for district heating networks The ability to recover heat below the acid dew point changes how industrial waste heat can be integrated into broader energy systems. It enables the use of low-temperature heat streams that were previously difficult to access but align well with the operating conditions of modern district heating networks. In a typical waste-to-energy or industrial plant, flue gas passes through several treatment
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