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PURItech - Model DAS-DBS Type A & Type B -Self-Cleaning System without Downtime with Active and Passive Regeneration
FromPURitech Gmbh
This system, developed by PURItech, combines an active regeneration (external fuel injection) and a passive regeneration (catalyzed filter or fuel born additive). The filter regeneration is automatically controlled during operation. DAS-DBS Type A and B are designed for application with low load.
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- Permanent self-cleaning from 180 C (only 5% of duty cycle)
- 24 hours operating cycle without downtime
- Low backpressure optimal for stage-3 engines
- Automatically controlled regeneration during operation
- Filter heating with diesel fuel injection (+300)
- Installation kit as a replacement for muffler
- Self-cleaning filter system without downtime, ideal system for continuous use / multi shift operation
- Combined filter system for vehicles with low load / low exhaust gas temperature (stop-and-go operation/city transportation)
- Combination of active (diesel fuel injection) and passive (fuel born additive) filter regeneration
- Fast filter regeneration, only a few minutes (full loaded filter)
- Easy installation; the system can be retrofitted on every vehicle (muffler replacement)
- Operation: Diesel fuel injection less than 1% active to the total operation, no diesel fuel penalty measureable
- Filter operation without high backpressure because of controlled filter regeneration
- Filter regeneration possible from 180 C (diesel injection activation)
- Electronically monitoring and data storage via data-logger
- Application : Low load / low exhaust gas temperature
- Type of Regeneration : Combined regeneration active + passive
- Regeneration Temperature : 180 C
- Regeneration Time : Permanent self-cleaning during operation Diesel injection to increase exhaust gas temperature (+300)
- Emission Reduction :
- Particle: -99%
- Carbon oxide (CO) -95%
- Hydro Carbons (HC) -99%
- Filter Medium : Filter monolith, Silicon Carbide (SiC)
- Approvals : TRGS / TUEV / KBA / AUVA / VERT + CARB (in process)
- Warranty : 1 Year
- Maintenance : Filter monitoring: 500 hours / filter cleaning 1000 hours
Schematic:
- Soot oxidation with fuel born additive content in diesel fuel (w/o diesel injection).
- Increase of exhaust gas temperature with additional diesel injection.
- Oxidation of the injected diesel within the pre-filter increases the exhaust gas temperature before the particle filter.
- Automatically activated diesel injection (controlled active regeneration).
- Times for diesel injection are automatically controlled by temperature before / temperature after pre-filter.
Fuel Born Additive dosing:
- Additive is added via dosing pump and return line into the diesel tank.
- Additive will be added after each diesel refuel.
- A diesel fuel level sensor calculates the right amount of additional additive.
- A float switch monitors additive level. If level is low an alarm is shown at a display/control unit.
- Dosing rate is adjustable on the display/control unit. Additive usage are stored within the electronic unit and shown at the display and control unit.
- Soot oxidation are initiated by the catalyzed filter (w/o diesel injection).
- Increase of exhaust gas temperature with additional diesel injection.
- Oxidation of the injected diesel within the pre-filter increases the exhaust gas temperature before the particle filter.
- Automatically activated diesel injection (controlled active regeneration).
- Dosing rate is adjustable on the display/control unit. Additive usage are stored within the electronic unit and shown at the display and control unit.
1. At medium/high exhaust gas temperatures (approx. >280C)
- Passive filter regeneration through catalyzed filter
- Soot oxidation on filter surface through catalytic reaction
- Low filter loading with soot particles
- Low backpressure increase
2. At low exhaust gas temperature (approx. <280C)
- Loading of the filter with soot particles
- Increase of backpressure
- Automatically activation of diesel injection
- Exhaust gas temperature increase from 180 C up to i.e. 450 C
- Fast soot oxidation on filter surface through catalytic reaction
- Diesel fuel is injected by the injection pump / nozzle into the exhaust gas stream.
- Diesel-exhaust gas-mixture flows through the pre-filter and oxidizes, conversion from chemical energy of the diesel fuel into heat energy, which increases the exhaust gas temperature.
- Increase of exhaust gas temperature is time controlled by the diesel injection.
- Diesel injection will be initiated if a maximum allowed backpressure before the filter is reached.
- Injection time is controlled by two temperature sensors (T1: before pre-filter / T2: after pre-filter)
Engines and vehicles with low load and low exhaust gas temperature
- Forklifts
- Vehicles with engine-stage 3
- Vehicles with crane operation
- From 180 C