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also separates out the good sand for re-use, avoiding extra cost. “It really helps to save a lot of money for fresh sand,” Hohenwarter points out. The system now also has no moving

parts, meaning that Schongau’s BFB boiler now has maintenance-free recirculation of its bed material, resulting in better system availability and safety. Frömmrich points out, “The modernization [which has a more enclosed set-up] has given us some big advantages. It’s running very well – we got what we wanted.” Also, combined with the new FGR

layer, the finer bed material and the right trim mean it has been possible to meet the new emissions targets without even having to use the SNCR (Selective Non Catalytic Reaction) system that UPM also decided to install at the mill. Hohenwarter smiles when he

reflects on this part of the project. “It was decided to play it safe, but I was 99% certain we wouldn’t need the SNCR system. We tested it out, but the modernized set-up at Schongau works so well that it’s just not necessary. It’s just used as a back-up system.” Frömmrich admits that this was one of his highlights, too. “This was the big bonus of the project. We didn’t know if we’d be able to meet our targets with just the primary measures, but we did it. We don’t need the SNCR system and its ammonia, so we avoid additional costs and the

New wind screen for advanced bed material recirculation.

technological and environmental challenges associated with that. The authorities preferred it this way, too.” The investment also involved two

new superheaters in the pressure part, as well as low-NOx ignition burners with integrated flue gas recirculation just above the secondary air system. Frömmrich explains, “We have been working very closely with ANDRITZ on the superheater side. We refined the combustion process and we have it well under control and it’s running really well.” Meanwhile, the new low-NOx ignition burners “have had a good effect”, says Frömmrich.

“Emissions are down. ANDRITZ resolved some clogging issues by using pressurized air and it’s working well. Performance has increased significantly. This also enabled us to close and dismantle the old back-up boiler and its oil system, which we sometimes used to fire the old burners.”

Time to reflect Summing up, Frömmrich says, “The project went really well.” UPM’s investment in this upgrade by ANDRITZ reduced the BFB boiler’s emissions, as well as improving operating stability

considerably. NOx emissions are now clearly below the new government limit, without even having to engage the new SNCR system. Hohenwarter says ANDRITZ was

right to be confident, “Even an old boiler can achieve good things when your modernization concept is right and both supplier and client know the value of good teamwork and open communication.” Frömmrich adds, “When the people are right, the project usually runs right. UPM and ANDRITZ were honest with each other and it was a pleasure to work together. I’m guessing they felt the same at ANDRITZ – I’m still in touch with them today.”

Delivered Package: Chip bin discharger Modernization of primary air system Modernization of secondary air system Modernization of flue gas recirculation (FGR) system New superheaters New Selective Non Catalytic Reaction (SNCR) system Optimization of bed ash system New low-NOx burners New fuel chutes Steam heater for secondary air Renewed brick lining Control and automation

UPM Schongau team Peter Frömmrich, Ulrich Starker, Karl Welz and Max Wörnzhofer, and ANDRITZ project manager Theo Bauer at the control room.

16 Forest Bioenergy Review Summer 2019

More information: Ulrich Hohenwarter; ulrich.hohenwarter@

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