Post on 10-Apr-2020
2004-01-0154
Optimization of Urea SCR deNOx Systems forHD Diesel Engines
Rinie van Helden, Ruud Verbeek and Frank Willems
Reinier van der Welle
ABSTRACT
•••
INTRODUCTION
•
••
CATALYST CONFIGURATION AND UREADOSAGE CONTROL
•
•
NO
x (%
)
NO
x C
on
vers
ion
[%
]
tem
per
atu
re f
req
uen
cy
Catalyst temperature [°C]
UREA HYDROLYSIS AND MIXING
••
camera
glasstubeglass
window
Inletchamber
Inlet pipe
SCR catalyst
SCR SYSTEM MODELLING
••
•
•
DISCUSSION
•
•
Design of system layout Control of urea dosage
CONCLUSIONS
•
•
•
•
•
•
•
REFERENCES
ACKNOWLEDGMENTS
APPENDIX
- Solid phase
NOdaNH rrrt
−−=∂
∂3
θ
- Gas phase
)(33
daNHNH
rrx
Cv
t
C−Ω−
∂∂
−=∂
∂
NONONO rx
Cv
t
CΩ−
∂∂
−=∂
∂
Ωv
)1(33
0NHNHaa Ckr θ−=
3
30 )1(
0NH
RT
E
dds
NHd
ekr θαθ−−
=
*θ
−=−−
*3
3
31*0 NH
NH
s
NO
eCekr NHNORT
E
NONO
θ
θ
θ
)(,, sgsgsgg
gpggg
gpgg TTahx
Tcv
t
Tc −−
∂∂
−=∂
∂↔↔ρερε
rNOasasas
sgsgsgs
sgs
spsg
HrTTah
TTahx
T
t
Tc
∆Ω+−−
−+∂∂
−=∂
∂−
↔↔
↔↔
)(
)()1()1(2
2
, λερε
2
Re
32v
dx
pg
h
ρ⋅
=∂∂
α
Ω
µ
3NHθ
*3NHθ
ρ
ε
∆ Hr
λ
a
C
cp
dh
E
0ak
0dk
0NOk
p
R
Re
T
v
x