EGR System Fouling Control
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1 EGR System Fouling Control Dr. Gordon Bartley for Reggie Zhan, Scott Eakle, John Miller, Joseph Anthony Southwest Research Institute R
2 Outline EGR System Fouling Control Introduction Objective Technical Approach y Use Aftertreatment Technology to Reduce EGR System Fouling Experimentation Results and Discussion Conclusion 2
3 Introduction Cooled EGR is a standard tool to meet US2007 Higher EGR ratio is expected for US2010 and future emissions regulations EGR can cause engine durability issues y Regular EGR System Maintenance is in Owner s Manual (MY2008 Dodge Ram with Cummins ISB), 60K miles 3
4 Effect of Diesel Particulate Matter (PM) Diesel Particulate Matter ychemical compositions (SOF: Soluble Organic Fraction) yeffect on regeneration performance Effect on EGR Cooler y High rate of erosive and abrasive wear Mechanical durability y Deposit and fouling of PM Heat transfer efficiency Carbon 47% 12% 12% 29% Fuel 4 SO 4 +H 2 O Lube Oil PM Chemical Composition - one example
5 Factors Contributing to EGR Cooler Fouling Two particle deposition mechanisms for EGR cooler fouling: yspecific particle size deposition ythermophoretic deposition y Thermal gradient is the key! Four factors that increase EGR cooler fouling: yhigh PM number (or mass) concentration yhigh gas temperature gradient across the cooler ylow gas outlet temperature to enhance condensation inside cooler ywet particle composition (soluble organic fraction SOF) 5
6 Objective Develop a Method to Effectively Reduce EGR System Fouling, with Minimum Impact on EGR Functionality Air Charge Cooler AIR FILTER EGR VALVE EGR COOLER DOC EXHAUST MANIFOLD Diesel Engine INTAKE MANIFOLD 6
7 Technical Approach Apply Different Aftertreatment Technologies y A: Uncatalyzed PFT y B: DOC + DPF (wall-flow) y C: DOC + cpft (Flow-through) y D: DOC + PFT (Flow-through) Compare Performance on EGR Fouling Reduction Compare Impact on EGR System Performance y Pressure Drop y Heat Transfer Efficiency 7
8 Experimentation Test Cell Setup yaftertreatment Systems yengine yegr Coolers Test Procedure 8
9 Experimentation Test Cell Setup Balanced Flow 9
10 Experimentation PM Control Devices D C 10
11 Experimentation Test Cell Setup EGR Coolers Engine PM Control Devices EGR coolers are from MY2008 Cummins ISB 6.7L (Dodge Ram)
12 Experimentation Test Procedure Engine Conditions Steady-state yrpm: 2000 ytorque: 563Nm EGR Coolers ygas Phase Flow Rate: 167 kg/hr (Balanced) ycoolant Flow Rate: 75L/min at 60 o C Measurements yegr Cooler Inlet/Outlet Temperatures yegr Cooler P, Overall P (EGR Cooler + PM Control Device) 12
13 Results and Discussions EGR Cooler P EGR Cooler Inlet/Outlet T Overall P (EGR Cooler + PM Control Device) A: Uncatalyzed PFT B: DOC + DPF (wall-flow) C: DOC + cpft (Flow-through) D: DOC + PFT (Flow-through) 13
14 EGR Cooler Gas Pressure Drop A: Uncatalyzed PFT B: DOC + DPF (WF) C: DOC + cpft (FT) D: DOC + PFT (FT)
15 EGR Gas Temperature A: Uncatalyzed PFT B: DOC + DPF (WF) C: DOC + cpft (FT) D: DOC + PFT (FT) EGR Cooler Final Outlet Temp T Rate of Change, C/Hr A 168 C -6.0 B 76 C ~ 0.0 C 172 C D 175 C
16 EGR System Gas Pressure Drop A: Uncatalyzed PFT B: DOC + DPF (WF) C: DOC + cpft (FT) D: DOC + PFT (FT) System % Increase A 157 B 11 C 114 D
17 Conclusions Four fouling control devices evaluated y A: Uncatalyzed PFT y B: DOC + DPF (wall-flow) y C: DOC + cpft (Flow-through) y D: DOC + PFT (Flow-through) The catalyzed PFT filter (C) provided no added benefit over the uncatalyzed PFT (D) The wall-flow DPF was the most efficient y Minimizing fouling y Lowest pressure-drop in long-run y Might require active regenerations 17
18 Discussion Cost ysystem cost vs. system maintenance Packaging yis there space? Durability yegr system regenerations 18
19 Future Tests Install the wall-flow DPF control device in a MY2007 diesel engine EGR system. ydetermine fuel penalty / power loss effects yservice life system durability 19
20 EGR System Fouling Control Dr. Gordon Bartley for Reggie Zhan, John Miller, Joseph Anthony Contact: Southwest Research Institute R
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