Diesel Emission Control Technologies: New and In-use Engines

Transcription

1 Diesel Emission Control Technologies: New and In-use Engines Manufacturers of Emission Controls Association (MECA) November Diesel Emission Control Technology Is Making Significant Progress Commercial Applications of Diesel Emission Control Technologies Expanding in Many World Markets Due to Tighter Emission Standards Diesel Particulate Filters for Reducing PM Emissions U.S./Canada 2007 heavy-duty diesel engines Japan 2005 heavy-duty diesel engines Most new diesel passenger car models in Europe Tier 2, Bin 8 and Bin 5 compliant light-duty diesel introductions in North America NOx Emission Control Technologies SCR in Europe for Euro IV/V heavy-duty compliance NOx adsorber catalysts introduced on limited number of light-duty diesel vehicles in Japan & Europe NOx adsorber available on 2007 Mercedes E 320 launch in North America; SCR to follow in Diesel Retrofit Technology Options and Programs Expanding for Reducing Emissions from In-use Engines 1

2 DOCs and DPFs Form the Technology Base for Reducing PM Emissions from New and In-Use Diesel Engines Diesel Oxidation Catalysts CO Aldehydes HC PAH SO 2 NOx CO 2 H 2 O SO 2 /SO 3 NOx Flow through monolith with catalytic coating Applicable to nearly all diesel engines; significant retrofit & OE experience base PM control through SOF oxidation significant reduction of toxic HCs Diesel Particulate Filters Standard on all on-road heavy-duty engines for 2007 in U.S. & Canada Significant experience base with LDD in Europe (> 3 million vehicles) DOCs & DPFs can be combined with Crankcase Filters for additional PM control 2007-Compliant HDD is using Active Filter Regeneration with Auxiliary Fuel Injection Systems 2007 HD DPF systems include DOCs or gas burners with catalyzed filters SiC and cordierite chosen for filter materials Little or no fuel penalty Normal filter cleaning intervals expected to be 200K-300K miles 2

3 DOC + CSF Systems are Lighting Off at Lower Temperatures with Pt-Pd Pd Catalyst Formulations DOCs w/ Pt&Pd have lower light-off temperature and better durability than with Pt only. Aged CSF with Pt-Pd has 50% lower HC and 75% lower CO emissions than Pt CSF, despite lower PGM loadings. DPFs with Active Soot Regeneration Strategies Available for Retrofits Example: uncatalyzed wall-flow filter with electrical regeneration 1-8 hour regeneration cycle Example: uncatalyzed wall-flow filter with a fuel burner Suited for on- and off-road applications with low exhaust temperatures including locomotives & marine engines 3

4 Flow-Thru or Partial Filter Technologies Emerging for Diesel Retrofits Metal Substrate with Sintered Metal Sheets Verified for 50-75% PM reduction Soot regeneration can be facilitated by a catalytic coating or DOC Has applicability on older engines, light-duty vehicles Filtering achieved with sintered metal sheets or wire meshes Resistant to plugging DOC + Partial Filter Retrofit Performance % Reduction - Hot FTP Test HC - '91 Cummins N14 De-greened DOC Aged DOC + partial filter PM - '91 Cummins N14 HC - '89 Cummins C8.3 PM - '89 Cummins C8.3 De-greened DOC + partial filter (3600 hours of field aging on a 93 refuse hauler) Reference: SAE Paper No

5 DPF+SCR Systems Are On the Road Strong Interest for 2010 New Engines & Retrofits 15 L Engine: 74-82% NOx Reduction thru 75,000 mi 12 L Engine: 81-91% NOx Reduction thru 2 years of operation 10 trucks operated for more than 2 million cumulative miles (2 refuse, 8 tractors; 3 emission tested) 45 liters of SCR cats./engine (200 cpsi) Reference: SAE Paper No Reference: SAE Paper No US HD NTE Performance: Emissions Can Not Exceed 1.5X the 2010 Standard Emission System Design Criteria Most demanding NTE regimes. 5

6 Zeolite SCR Catalysts Provide High Temperature Performance Zeolite SCR catalysts have broader temperature range Zeolite SCR catalysts are more tolerant of excess NO 2 than vanadia systems. Zeolite SCR catalysts have better HT durability than vanadia catalysts. Aged 50 hours at 700C. Source: SAE Gothenburg, 9/05 Urea Injection Systems Moving from Air Assist to Airless Designs 6

7 NOx Adsorber Catalyst Development Continues to Show Progress: Example Low Temperature NOx Performance Note: first baseline LNT and advanced LNT are Ba-based; Second baseline LNT is K-based Source: SAE Paper No Advanced System Designs Emerging that Combine LNTs and SCR Catalysts: Mercedes E320 CDI Reference: Mercedes Benz press release 7

8 Honda s s Advanced Clean Diesel Strategy Layers LNT and SCR Catalyst Functions on a Single Substrate Reference: Advanced System Designs Emerging that Combine LNTs and SCR Catalysts with No Urea Reductant Conventional HDD DPF/SCR Design Advanced HDD LNT+ SCR Design (no urea addition) Reference: DEER

9 Advanced System Designs Emerging that Combine LNTs and SCR Catalysts with No Urea Reductant Reference: DEER 2006 Growing Diversity in U.S. Retrofit Projects: More than 250 projects documented in July 2005 EPA report Retrofit experience report available at: 9

10 Retrofit Experience Expanding to Off-road Equipment: NY City Croton Construction Project $1.5+ billion water treatment plant in the North Bronx; project extends through non-road machines (Tier 2 & Tier 3 engines) ARB or EPA verified retrofit technologies including passive & active DPFs, DPF+SCR system Challenges for Off-road Retrofits More diverse engine/equipment application space than on-road Misfueling with higher sulfur fuel needed for some catalyst-based filters Lack of preventative maintenance especially air filters, injectors and turbochargers basic inspection and maintenance of installations Vibrations can require extensive use of high grade vibration isolators especially in track drive equipment Maintaining driver visibility Interference with the installation process taking short cuts to get machine done now owners demanding things done their way 2006 MECA case study reports for construction equipment, locomotives, marine diesel engines document experience with emission controls 10

11 Summary Technology Forcing Standards are an Important Driver for Continued Emission Control Innovations and Investments A Variety of Technologies are Available and Emerging for PM, NOx, and Toxic HC Emission Control for New Diesel Engines Technology will migrate from on-road to off-road engines Retrofit Experience Is Growing Worldwide with a Variety of Technology Options Available for Controlling PM and NOx Emissions from On- and Off-Road Diesel Engines In the absence of regulations, incentive funds critically important for driving the application of retrofits on in-use engines 11