Dieffenbacher energy systems and dryers: Integrated solutions from a single source

Dieffenbacher’s drum and flash tube dryers are recognised for their efficiency, reliability and ability to meet high safety standards. In total, Dieffenbacher (together with former Metso/Sunds and Schenkmann Piel Engineering) has sold 85 drum dryers and 196 flash tube dryers over the last 40 years.

Energy systems from Dieffenbacher with capacities of up to 120 MW thermal capacity can use a wide range of biomass fuels to generate hot gas for the dryer, or produce steam or hot thermal oil for various heat consumers. Together with former Teaford, Dieffenbacher has sold 36 energy systems around the world.

 

Drum dryers

Dieffenbacher recently sold two drum dryers with 100 t/h mechanical throughput on a dry basis. These drum dryers are the ideal solution for drying wood fibre for particleboard, strands for OSB production, disintegrated seasonal annual crops and other biomass.

The dryer internals are designed according to the material’s characteristics for high thermal efficiency, low moisture fluctuation and low emissions.

 

Flash tube dryers

Flash tube dryers from Dieffenbachershould be the first choice for efficientlydrying wood fibres for the productionof MDF, HDF and THDF. Dryers witha dry fibre throughput of more than60 t/h have been operating for many years.

In addition to single-stage dryers,Dieffenbacher also offers two-stagedryers and single-stage dryers withair recycling system, offering energycost savings of up to 15 per cent anda significant reduction in the exhaustgas flow. Additional benefits can beachieved by adding the EVOjet M andSGF or Z-sifter to the dryer and energysystem package.

 

Energy systems

With their robust design and low maintenance requirements, Dieffenbacher energy systems allow long operation periods without forced shutdown. This provides high availability and reliable operation.

The firing system consists of an air-cooled reciprocating grate using the coarse biomass fractions of the wood panel production process (eg. bark, wood chips, coarse trimmings) as fuel.

The system can be equipped with various injection nozzles for the combustion of dust and granulate fractions from screening, sawing and sanding as well as additional gas burners. Generating hot thermal oil and providing hot gas to the dryer system can be controlled independently of each other in order to meet individual peak load demands. Recirculating hot gas from downstream of the thermal oil heater optimises the combustion process and operational flexibility of the energy system.

 

Integrated solutions

The perfect integration and compact design of the energy system and dryer help to reduce operating costs and create additional value for customers – from the planning phase through the complete lifecycle. The hot gas cyclone connecting the energy system and dryer minimises ash carry-over, thus reducing wear of the dryer cyclones and RTO ceramics.

Integrated into the panel line control infrastructure, fully automated operation controls minimise the number of operators, further reducing operating costs. The interconnected mechanical and process design reduces interfaces, and the system’s fast and effective adaptation to changing loads supports plant efficiency.