Project: Riihimäki WtE plant
Customer: EKOKEM Oy Ab / Finnland
The Finnish company EKOKEM Oy Ab operates a waste-to-energy plant in Riihimäki, north of Helsinki. The supplied 3-pass corrosion-resistant gas-gas heat exchanger (GGH) was ordered as a replacement for the old heat exchanger.
In the GGH, the raw gas is passed through a filter and the heat exchanger tubes and the purified clean gas is directly heated by the raw gas, which has not yet been cooled in the scrubber. ?AlWaFlon tubes with a diameter of 52mm were installed in the 3-pass heat exchanger. The steel housing is internally protected against corrosion by a plastic film made of TFM. The conversion was completed very quickly thanks to the matching dimensions.
Design data
Raw gas volume flow
116.700 Nm3/h
Inlet/outlet temperature?
170 °C/ 106 °C
Pressure loss raw gas
5,3 mbar
Clean gas volume flow
122.444 Nm3/h
Inlet/outlet temperature
59 °C/ 120 °C
Pressure loss clean gas
8,0 mbar
Heat transfer
2.870 kW
Pollutant analysis
| Raw gas | Clean gas | ||
|---|---|---|---|
| SO2 SO3 HCL HF Dust | 1.000 mg/Nm3 50 mg/Nm3 1.000 mg/Nm3 50 mg/Nm3 50 mg/Nm3 | SO2 SO3 HCL HF Dust Free droplets | 50 mg/Nm3 20 mg/Nm3 10 mg/Nm3 1 mg/Nm3 2 mg/Nm3 50 mg/Nm3 |
