( WHR) Waste Heat Recovery Plant

Services Details

Mechanical design Steam is used for AC reheating, and at the same time HT heat is dumped to sea at port. To reduce the steam and oil-fired boiler fuel consumption a new WHR system for utilizing HT heat for AC reheating was installed. One WHR heat exchanger was installed on each diesel engine.

The WHR system was done on board Azamara Journey and Quest. The following modifications were conducted.

• Modifying DG inlet HT water- and outlet HT water temperature controls
• Using HT heat for AC reheating

1        Modifying DG inlet HT water- and outlet HT water temperature controls

Inlet HT-water temperature control

HT-water temperature after HT/LT mixing is kept at the set point by directing water from HT to LT cooling system with a control valve. Currently a local controller controls the valve, but in this project the controls were moved to be done by MAS. The existing PT100 temperature sensors and control valves were used for the controls.

The temperature set point will vary according to engine load. The load depending set point curve will be adjustable by the operator.

HT-water temperature control valve

HT-water outlet temperature after charge air cooler is controlled by a 3-way valve returning part of the water back to engine inlet. Currently there is a local temperature controller that performs this function, but in this project the controls were moved to be done by MAS. The existing outlet PT100 temperature sensors and control valves are used for the controls.

Diesel generator power will be used to feed forward function for the PI-controller. This avoids a large “overshoots of the HT-water temperature when engine load changes.