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PURItech - Model DPFN+ -Self-Cleaning Standard System with Pre-Filter
This DPFN+ system by PURItech contains of an additional pre-filter. Because of that the system regenerates (self-regenerating) even at low temperatures. The DPFN+ is applicable mainly at city transportation applications. The DPFN+ system is a typical filter for metro busses and distribution vehicles.
- Permanent self-cleaning at 225C (average)
- 24 hours operating cycle without stop
- Monitoring system and system check
- Installation kit for almost all engines available
- The DPFN+ system is a self-cleaning filter system with passive regeneration on a catalyzed basis
- The DPFN+ system consists of a pre-filter
- Filter and catalyst is one unit
- The system consists of ceramic monolith
- The DPFN+ system is designed for applications with exhaust gas temperatures from 225 C and can also be used on diesel engines with medium loads
- Filter system for low backpressure, due to controlled filter regeneration
- Electronic system monitoring and data logging of operation per central unit
- Application: >20% long distance operation, >25% full load operation
- Type of Regeneration: Passive regeneration
- Regeneration Temperature: Exhaust gas temperatures from 250C
- Regeneration Time: Permanent self-cleaning during operation
- Emission Reduction:
- Particle: -99%
- Carbon oxide (CO) -95%
- Hydro Carbons (HC) – 99%
- Filter Medium : Filter monolith, Aluminum Oxide (Corderit)
- Approvals: TRGS-554 / TUEV / KBA / AUVA / VERT / CARB et al.
- Warranty: 1 Year
- Maintenance: Filter monitoring: 500 hours / filter cleaning 1000 hours
The DPFN+ system consists of ceramic monolith, sheathed with a stainless steel can and internal insulated with an elastic mat against vibrations.
The filtration is achieved by a wall-flow method where the channels are plugged on one end and particles are remaining in the wall while the gas flows through the walls. A huge number of channels result in a big filter surface with a high storage capacity for soot particle.
The regeneration process of the DPFN+ system converts soot into carbon dioxide (CO2) and water. A residue of burned oil (ash) remains in the filter.
- Monolithic filter block made of Aluminum Oxide
- Honeycomb with reciprocally closed channels
- Channel wall with porous structure
- Exhaust gas flows through channel wall and gets filtered
- Surface of the channels are catalyzed
Long Distance Traffic
- Long Distance traffic with light load or the load is unknown
Regional Distribution
- Regional distribution with partial city transportation
City Transportation
- Less stop-and-go part
- Less idling or traffic
- Drive most of the time with load
Construction Application
- Construction application with high engine load and short idle time
Exhaust gas temperature of the vehicle:
Medium
- 230 C medium exhaust gas temperature AND
- 250C Exhaust gas temperature
- 30% duty cycle AND
- 300 C Exhaust gas temperature AND
- 20% duty cycle AND
- 320 C Exhaust gas temperature
- 10% duty cycle
The DPFN+ system doesn’t work at short distances / city transportation applications with high stop-and-go parts and long idling times.