Acidic Condensation in HP EGR Systems Cooled at Low Temperature Using Diesel and Biodiesel Fuels Valeo Engine Cooling

Format:

Conference/Event

Author/Creator:

Bourgoin, Bourgoin, author.

Contributor:

Lujan, Jose

Plá, Benjamín

Tomas, Eva

Conference Name:

International Powertrains, Fuels & Lubricants Meeting (2010-05-05 : Rio De Janeiro, Brazil)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

In order to further reduce NOx emissions in increasing HP EGRcooler performance, several OEMs have decided to use a secondarycooling loop dedicated to bring cold water (around 35°C) to the HPEGR heat exchanger. Nevertheless, strongly cooled EGR gases cancondensate in the cooler-producing acidic liquids which can corrodesome parts in the loop. It is therefore necessary to define EGRcomponents compatible with such kind of environment andconstraints.Testing was performed on a 2.0-liter EU4 diesel engine, using alarge panel of current fuels including neat biodiesels fromsoybean, rapeseed or palm, as well as low and high sulfurpetroleum-based diesels. In order to cover all existing cycleconditions, the HP EGR is cooled from 20°C to 90°C independentlyfrom the engine coolant circuit. In the aim to perform a faircomparison among biodiesels and diesels, injection and air massflow setpoints coming from the serial EU4 calibration were adaptedto achieve same torque and similar NOx emissions for all fuels.As expected, at a constant air mass flow setpoint, a strong EGRcooling allows a noticeable reduction of NOx emissions due to asignificant increase of the EGR rate. Volumes and acidity ofcondensates were measured: as calculated and correlated by means ofpsychrometric charts, and depending on the calibration, tests showthat condensation occurs for gas temperatures below 50°C andrepresent up to 400 ml/h at 20°C ambient temperature. Condensateacidity is similar for all tested fuels and stays within anacceptable range for products in series

Notes:

Vendor supplied data

Publisher Number:

2010-01-1530

Access Restriction:

Restricted for use by site license