|Abstract Title:||Emission Testing of Commercial Harbor Craft (CHC) Using Mini-PEMS|
|Presenter Name:||Mr Matthew Berry|
|Co-authors:||Mr Tianbo Tang|
Mr Georgios Karavalakis
Mr Thomas Durbin
Mr Kent C Johnson
Abstract Information :
Marine vessels, including ocean going vessels (OGV) and commercial harbor craft (CHC), contribute significantly to air pollution in California, especially nearby and downwind from commercial seaports. Local, state, and federal air quality programs have reduced emissions of criteria pollutants, such as oxides of nitrogen (NOx) over the past decades. While significant efforts are being made to reduce emissions from OGV and CHC, there are still knowledge gaps and a need for continued emission reductions, which will require implementing existing regulations and developing new control measures. California air resources board (CARB)'s current CHC regulation applies to smaller diesel-powered vessels such as tugboats, ferries, barges, and many others. The current regulation requires in-use and new vessels to meet cleaner emission standards which include Selective Catalytic Reduction (SCR) technology.
To help bridge this knowledge gap, this research aims to improve the emission inventory for CHC spanning older technology (Tier 2 and 3) as well as the latest SCR equipped engines (Tier 4). The main objective of this testing is to characterize and quantify in-service off-cycle emissions from various CHC. The measurement data collected will include NO, NO2, CO and CO2 and will be used to gain a better understanding of off-cycle CHC emissions, and if necessary, to improve emission inventory estimates from CHC. This research project objects include seven tugboats and four ferries that are currently operating in Northern California (Bay area) or Southern California (San Diego, Los Angeles and Long beach). For Tier 4 vessels, both pre-SCR and post-SCR emissions will be measured for both port and starboard side of the vessel. So far, we have finished one Tier 2 and one Tier 3 tugboat emissions testing and we will start testing Tier 4 tugboats and ferries in the near future. Due to the logistical difficulty of testing CHC with compliant PEMS, modified type of PEMS, parSYNC® iPEMS and PG350 (PG350 will only be used for Tier 4 tugboats/ferries), were and will be used to complete this work. This in-use emission testing will help identify and contribute to the technical feasibility of engine manufacturers meeting more stringent marine engine standards.