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