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Marine Log

October 10, 2006

New report on diesel emission controls

The Manufacturers of Emission Controls Association (MECA) has just published a report entitled "Case Studies of the Use of Exhaust Emission Controls on Locomotives and Large Marine Diesel Engines."

MECA's idea of what a "large" marine diesel is more or less a locomotive-size engine.

MECA says "many of the diesel emission control technology options first developed for light-duty passenger cars, heavy-duty highway vehicles, and stationary engines (for application on both new vehicles and retrofits on existing vehicles) are now seeing limited application or are involved in feasibility studies on locomotive and large marine diesel engines... These technologies include diesel oxidation catalysts (DOCs) and diesel particulate filters (DPFs) for controlling diesel particulate matter (PM) emissions, and lean NOx catalysts and selective catalytic reduction (SCR) catalysts for reducing NOx emissions."

You can access the complete report here. Meantime, here's a summary of some of the maritime case studies covered.

New York Harbor Private Ferry Emissions Reduction Program

The New York State Energy Research and Development Authority (NYSERDA) has initiated a $6.8 million program to collaborate with private ferry operators to demonstrate emission reduction technologies. In September 2003, Seaworthy Systems, Inc. was awarded with a prime contract to oversee the implementation of the demonstration program, with assistance from Environment Canada, Northeast States Coordinated Air Use Management (NESCAUM), and ESI International.

New York Waterways, Inc.; Seastreak, Inc.; and New York Water Taxi, Inc. are participating

Phase I of the project consists of fleet characterization; emissions control technology analysis, ranking, down-selection; and demonstration of three to five selected technologies.

Phase 2 consists of providing an estimated $5 million for incentivizing the private fleets to install the selected technologies.

Technologies selected for demonstration are:

DOC plus fuel-borne catalyst installed on CAT 3412E vessels. It is estimated that this would achieve NOx reductions of 5% with ULSD and PM reductions of 50%.

SCR plus DOC installed on Cummins KTA50M2 engines. It is estimated that this would achieve NOx reductions of 70% and PM reductions of 25%.

DOC on Detroit Diesel Series 60 engines. It is estimated that this would achieve PM reductions of 40%.

DOC plus Continuous Water Injection System installed on CAT 3406E or 3412C engines. It is estimated that this would achieve NOx reductions of 25% and PM reductions of 40%.

More information on this project is availablehere.

Staten Island Ferry Emissions Reduction Demonstration Project

The MV Alice Austen was retrofitted with SCR and DOC systems on its two main CAT 3516A propulsion engines.

West Virginia University and M.J. Bradley & Associates conducted the emissions test program on the Alice Austen vessel during April 2005 and issued a report summarizing these emission results in August 2006. The emission testing observed on the ferry showed an overall trip reduction of NOx ranging from 68.6% to 81.2% using the installed SCR system. NOx reductions during ferry cruise modes with urea injection operational typically exceeded 94%.

The DOC was shown to reduce CO production by 80% to 95%.

No clear conclusions on the effects of the SCR on PM can be made without additional testing because the bulk of the PM was produced during transient engine operation and because the number of PM tests was limited. More information on this project is available here.

Vallejo Ferry Demonstration Project

The city of Vallejo, CA, has purchased a low emissions ferry that utilizes urea-based selective catalytic reduction (SCR).

More information on this project is available here.

Blue and Gold Ferry Demonstration Project

San Francisco-based Blue & Gold Ferry has retrofitted a ferry with a lean NOx catalyst and DPF system on new main propulsion engines. The system is expected to achieve more than 30% reduction in NOx and more than 85% reduction in PM. After installation of the emission control devices, there have been some issues with high back pressure and exhaust temperature.

ARB is currently working with the Bay Area Air Quality Management District and the vendor to resolves these issues. More information on this project is available here: .

ARB Harbor Craft Demonstration Project ARB plans to finalize regulations in late 2006 for controlling PM and NOx emissions from existing harbor craft operating in California waters.

The use of retrofit diesel emission controls is one of the compliance options that will be a part of these regulations. ARB plans to demonstrate the use of selected diesel retrofit technologies on a few marine vessels in late 2006 and into 2007 as part of this rulemaking effort.

Details on ARB's harbor craft regulatory process are available at: here.

U.S. Navy Work Boat/Barge

The California ARB and the U.S. Navy have initiated a demonstration project to reduce diesel emissions from a U.S. Navy work boat/barge. Two two-stroke DDC 12V-71 engines have been rebuilt with an engine rebuild kit provided by Clean Cam Technology (CCT) Systems. These engines have also been retrofitted with active DPFs and use low sulfur diesel fuel.

More information on this project is available at: here.

Other case studies covered in the report include the Holland America Line seawater scrubbing project we reported on here in August.

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