Design

The Aalborg i-OC is a vertical and cylindrical boilerthat employs natural circulation of water

and steam. Its pressure sections are manufactured from mild steel that is able to withstand

high temperatures.

The plant is designed according to Alfa Laval’s modular Aalborg boiler concept, with a main

module that comprises two parts: an oil-fired section and an exhaust gas section that recovers

heat from the main engine.

One or two optional exhaust gas modules (Alfa Laval Aalborg Micro boilers) can be incorporated

for auxiliary engine waste heat recovery. Handling the auxiliary exhaust gas with separate but

connected modules ensures flexibility and a stress-free plant design.

• Oil-fired section

The oil-fired section of the main module comprises a furnace, a steam space and a convection

section. The convection section, through which the flue gas flows, consists of helix tubes with

a turbocleaning effect.

• The modulating-type pressure-atomizing burner (Aalborg MF PA) is fully integrated with the

convection part of the oil-fired section. The burner housing is mounted on the boiler front,

angled 15° downwards towards the furnace bottom. It optimizes the flue gas flow distribution

during combustion, which results in higher performance in the convection part and lower NOx

emissions.

• Main engine exhaust gas section

The main engine exhaust gas section comprises smoke tubes and an internal bypass damper.

The bypass consists of a plain tube welded to the lower and upper tube plates,

with the automatic damper installed in the top.

• Auxiliary engine exhaust gas boilers (optional)

The exhaust gas boiler modules for auxiliary engine waste heat recovery comprise serrated

and finned spiral tubes. Each module has its own exhaust gas bypass damper.

These smaller modules are bolted directly to the main module, with no piping or other

equipment. All boiler mountings are shared with and installed on the main module.