Alfa Laval introduces a pressurized exhaust gas recirculation radiator

It is reported that this wide-type high-pressure, series-connected economizer can be installed on the Mann diesel engine and turbine engine before the nozzle is cooled and exhausted before the pressurized exhaust gas is recirculated.

According to Alfa Laval, this means that the economizer can economically recover waste heat while reducing engine load to as low as 30% - and can improve steam quality and temperature and increase the power that can be recovered.

According to John Pedersen, Alfa Laval's Boiler, Combustion and Heater Business Manager, “Aalborg's pressurized exhaust gas recirculation high-pressure economizer even helps ships by reducing the waste heat recovery turning point from medium to low engine load. Achieve lower deceleration. This means that fuel savings will accelerate the return of the economizer, offset the investment in pressurized exhaust gas recirculation and reduce CO2 emissions while reducing nitrogen oxide emissions."

Pedersen pointed out that by operating at lower engine loads, Aalborg's pressurized exhaust gas recirculation high-pressure economizer will create the possibility of a lower speed sailing. “Because ships can sail at lower speeds, fuel savings can be achieved. A vessel that performs exhaust gas recirculation and uses Aalborg pressurized exhaust gas recirculation high-pressure economizers not only meets Tier III requirements, but also Greatly improve fuel efficiency."

In a project supported by the Danish Energy Technology Development and Demonstration Project (EUDP) and developed in cooperation with Aalborg University, the pressurized exhaust gas recirculation boiler has been rigorously tested on the Maersk Cardiff.

Ole Christensen, senior mechanical specialist at AP Moller-Maersk Group, stated, “As a leader in the pursuit of green technology, we are looking forward to seeing everything that Aalborg's pressurized exhaust gas recirculation high-pressure economizer can achieve, But at the same time, we are enthusiastic about the potential of this boiler, how Aalborg pressurized exhaust gas recirculation high-pressure economizers deal with physical reality, we still have some uncertainty. Aalborg pressurized exhaust gas recirculation high pressure section The temperature of the heat exchanger will be twice as high as the temperature of the conventional waste heat recovery, and the pressure is much higher."

The boiler was connected to the MAN B&W 6S80ME-C9 two-stroke engine on board the Maersk Cardiff in November 2014. Christensen pointed out that "not only the boiler can survive, but we have seen very promising during the test."

Alfa Laval believes that exhaust gas recirculation boilers have changed the balance of nitrogen oxide compliance issues. Pedersen concluded, “Suddenly, exhaust gas recirculation is not only a way to meet the Tier III rules, but also a fundamental way to improve the energy efficiency of ships. Exhaust gas recycling has become a very different investment.”