ammonia storage and delivery systems for nox...
TRANSCRIPT
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