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面向EU6排放控制的天纳克全系统解决方案-


Tenneco Confidential

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Tenneco Confidential

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Tenneco Confidential Tenneco Confidential

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Tenneco Diesel Afte

r Treatment System Overview

DOC, DPF, SCR, Burner/DPF: EU IV, EUV, EUVI, EPA07, EPA10
Tenneco Confidential

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Emission Limits in Europe for Heavy Duty Trucks – on road
0,1 0,08 PM [g/kWh] 0,06 0,04 0,02
EU VI EU V EU IV
EU III NOx PM EU IV NOx PM EU V NOx PM EU VI NOx PM ESC 2000 5,0 g/kWh 0,1 g/kWh ESC/ETC 2005 3,5 g/kWh 0,02/0,03 g/kWh ESC/ETC 2008 2,0 g/kWh 0,02/0,03 g/kWh ESC/ETC 2014

EU III

0 0 1 2 3 NOx [g/kWh] 4 5

0,4 g/kWh 0,01 g/kWh

Tenneco Confidential

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Strategies to Meet Future Limits

Particulates

cooled EGR; High Pressure CR; …

DPF (>90%)

EU III engine

EU VI

SCR (>80%)

EU V

EU IV

NOx
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Tenneco Confidential

Tenneco EU VI Layout

SCR

Burner/DOC DPF

Urea Injector

Tenneco Confidential

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EU VI Sample

Tenneco Confidential

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DPF - Filtration

ASH

Wallflow filter
Cordierite, SiC, AT or sintered metal >95% filtration efficiency Needs soot loading control Collect ashes maintainance

?Open filter“
Sintered metal, foam, wire mesh <50% filtration efficiency Self controlled Maintainance free risk of soot clouds

TEN recommends wallflow filters to meet filtration efficiency targets
Tenneco Confidential

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DPF - Regeneration

Active regeneration required

O2 Regeneration with additive (FBC)

O2 Reg.

CSF CRT (NO2 Regeneration)

VEHICLE OPERATION RANGE

TRUCKS PASSENGER CARS 250 450
Tenneco Confidential

100

600

T [°C]
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TRUE-Clean? Sizing Strategy
4“

Burner size Small
6 “ LF & HF

Outer Max. Max. diamet exhaust pressur er flow e loss [inches] [kg/h] [kPa] 4 6 6 10 400 800 1250 2500 6 6 6 6

Max. air flow [g/s] 14 24,5 35 45,5

Max. fuel flow [g/s] 2 3,5 5 6,5

Burner power [kW] 84 147 210 273

Medium - Low Medium - High Large

10 “

Tenneco Confidential

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Burner Control System

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Model-based control with OBD function Controls the outlet temperature through varying air and fuel quantities, as well as the sparking events, flame monitoring, regen triggering, and diagnostics

Tenneco Confidential

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T.R.U.E.-Clean? Regeneration Strategy

Application DPF measurements are obtained to calibrate predictive tools and feed empirical models
– – – – – – – – Engine speed / load maps Exhaust system thermal response DPF soot load distribution DPF soot load models Regeneration triggers Regeneration effectiveness Regeneration profiles Control algorithms

Tenneco Confidential

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Tenneco –T.R.U.E. Clean Benefits

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Self cleaning of the igniter over the life cycle Ion sensing and continuous flame feedback
– flame detection – flame quality

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Advanced design to meet operating specifications at all operating points
– Light-off and 650C obtainment – Stable lean flame – Fast transient response – No critical orifices to clog

? ? ?

Fabricated design and common parts across sizes leads to lower cost Flexible vehicle packaging Capable of integrating full exhaust system
– DPF, T.R.U.E. Clean, SCR, Sensors, Controls
Tenneco Confidential

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TRUE-Clean? - Flame Controller

0,4 sec

After flame off detection, it takes only 400ms to restart the burner
Tenneco Confidential

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Elim-NOx? - Product Overview
Wire Harness Urea Line Injector Coolant Line

Small Box w/ DCU Urea Tank

NOx Sensor Temp Sensor SCR Box
Tenneco Confidential

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SCR Sub-system Overview

? ? ? ? ? ? ? ?

Dosing/Injection System Fluid Delivery System Freeze/Thaw System Control/sensor System OBD System SCR Canning System Piping and packaging Full SCR system
Tenneco Confidential

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Elim-NOx? - Injector

? ? ? ? ? ? ? ?

Airless Injector Technology Pulse width modulation for accurate flow control Return flow style injector for cooling 12V or 24V Operation Fine Atomization < 60?m wide spray angle 60° recommended Flow range: 4g/m – 500g/m urea varies with orifice size Suitable for urea & HC injection

Tenneco Confidential

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Elim-NOx? - DCU Box Assembly

? ? ? ? ? ? ? ?

Pump Serviceable filter Urea pressure transducer Heat and power relays DCU (Dosing Controller Unit) with TEN dosing algorithm Learn pack for fast calibration Integrated heating Environmentally sealed with SAE J2044 fluid connections

Pump Filter

DCU

Tenneco Confidential

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Urea SCR Mixer – Function

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Atomization – Reduce SMD – Whole spray has to impinge mixer – Prevent direct spray-to-pipe contact Evaporation – Requires big surface area Typically high backpressure – Leidenfrost effect to be considered Mixing – Efficient mixing of vaporized urea with exhaust stream – Macroskopic mixing advantageous
Tenneco Confidential

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Urea SCR Mixer – Examples

Tenneco Confidential

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SCR System Integration – Development Objectives

? ? ? ? ? ? ?

Efficient catalyst usage uniform flow distribution Efficient conversion of urea into ammonia Efficient mixing of ammonia & exhaust gas ammonia must cover NOx distribution! No ammonia slip No deposits Low backpressure Compact, low cost and low weight system

Deposits with non-optimized SCR system
Tenneco Confidential

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SCR System Integration – Tenneco’s Three Step Approach

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STEP1

Simulation

– Design tuning for flow uniformity – Injector & Mixer Positioning – Pressure loss analysis

?

?

STEP2 Hot Flow Bench – Steady state NOx conversion – Design adjustments – Fine tuning of injector & mixer position w/o mixer – Deposit evaluation STEP3 Engine Bench – Design validation under transient testing – Focus on overall NOx conversion efficiency, ammonia slip and deposits
Tenneco Confidential

TEN mixer

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Step 1 - CFD Simulation

Fully coupled 2-phase calculation with impuls, heat- & mass transfer between the phases
Tenneco Confidential

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Step 1 - CFD Simulation

Deposit risk

initial design

Improved design

Tenneco Confidential

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Step 2 - HotFlow Bench

w/o urea

with urea

Local NH3 concentration

124 125 126

127 128

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52

78 130 0 26 52 78 130

[ppm]
NH3-Uniformity-Index:

γ = 1?

∑ A * (c
n i =1 i n i =1

NH 3,i

? c NH 3

)

2

2 * ∑ Ai * c NH 3

(max. = 1,0)

γ (NH3) = 0,93
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Tenneco Confidential

Step 3 – Engine Bench Validation

Catalyst 4“ x 7“ Grid size 15x15mm (69points) X-direction

Y-direction

Probe pipe for NOxmeasurement

Tenneco Confidential

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Conclusions

? High sulfur fuel impacts aftertreatment strategy in China ? SCR system integration is critical to avoid problems – Tenneco owns a set of simulation and testing tools to do that effectively ? EUVI will require a combination of both technologies for all vehicles – Tenneco‘s TRUE Clean is an enabler for high performance and good fuel efficiency

Tenneco Confidential

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Thank you!


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