Ammonia storage and delivery systems for NOx...
Transcript of Ammonia storage and delivery systems for NOx...
Ammonia enabling technologies
Ammonia storage and delivery systemsfor NOx aftertreatment
Tue Johannessen, Henning Schmidt, Jakob Svagin and Jan OechsleAmminex A/S
Poster location: P21
Key issue: Reductant storage for SCR Ammonia is the active molecule Urea is currently considered as “fuel” for SCR But urea presents many challenges for LD/PC
Low capacity “Issues” in both cold and warm climate Conversion and mixing in exhaust line (deposits?) Limitation on dosing at low load / urban driving
DEER 2007 © Amminex A/S, 2007 14.09.2007
SCR
Muf
fler
Feed
ing
line
DPF
Ammonia stored safely in AdAmmineTM: Mg(NH3)6Cl2 (>50 wt% NH3; > 600g NH3/liter) No degradation; long shelve life 100g material sample
300% higher capacity than urea (AdBlue) Safe storage enables direct ammonia dosing for SCR
Release by controlled thermal desorption of NH3 from cartridges: AdAmmine cartridge with heater, Psensor, thermocouple Dynamic dosing from 3.5kg prototype demonstrated
7
Am
mo
nia
flo
w (
SL
PM
) FlowrateSP 6
Ammonia dosing 5
4
3
2
1
ECU 2500 liters NH3 (STP) 0
94 96 98 100 102 104 106
Time (min)
DOC System design and performance: Dosing Ammonia Storage and Delivery Systems – ASDS
Power demand for US06/FTP75 < 60W ADCU Peak flows above 10 SLPM
Electronics and control: Storage unit Algorithms for power minimization
OBD functions
DEER 2007 © Amminex A/S, 2007 14.09.2007