Summary and conclusions

Reduktion af UHC og andre organiske stoffer fra gasmotoranlæg

The UHC catalyst has been in operation since February 2007 and has run 3,500 hours as at the end of May 2008. The UHC catalyst still operates with a constant conversion of UHC and CO.

Prior to the initiation of the project, the exhaust temperature was 430°C, but in connection with a top-end overhaul and subsequent adjustment of the engine shortly before the initiation of the project, the exhaust temperature dropped to 400°C. Installation of the afterburner has thus not provided the desired exhaust temperature in the catalyst.

When the UHC catalyst was installed, the conversion of UHC was 40-45%, however, the conversion dropped during the first operating hours. Today, the UHC reduction is stable at 26.4% at an inlet temperature in the catalyst of 450°C.

The overall efficiency for the generator set has increased by approx. 4%, so it will presumably be a profitable investment for similar combined heat and power plants, dependent on annual number of operating hours, heat requirement and alternative “cheap” heat sources.

A way to optimize the installation could be to build in another type of burner that does not require the same high oxygen concentration in the exhaust and thereby air supply from the surroundings, but which can settle for the oxygen concentration in the exhaust (approx. 12%). This will increase the exhaust temperature in the catalyst significantly at the same time as the amount of exhaust through the catalyst will be reduced considerably compared to the current installation.