Natural-circulation HRSGs

Alfa Laval’s HRSG design offers the possibility of natural

circulation evaporators, which combine maximum uptime with

reduced capital and operational expenditure. Natural-circulation

evaporators operate without circulation water pumps, which are

known to be high-maintenance items due to harsh operational

conditions and fluctuations involved at sea. The circulation in

the evaporators is induced naturally by the density difference

between vapour and liquid, providing trouble-free operation with

minimum O&M involvement throughout HRSG lifetime.

Alfa Laval has extensive experience with natural-circulation

HRSGs in both land and marine environments. Our first land-

based installation was in the 1990s, and marine installation

in the 2000s. Since then, we have gained a market-leading

position in natural-circulation HRSGs for marine segments.

Cruise ships and icebreakers are among the more challenging

environments for HRSGs and the associated steam system, due

to highly intermittent operating profiles combined with a dynamic

seafaring environment. The fact that Alfa Laval dominates in

these applications is evidence of our expertise in HRSGs and

natural circulation.

If you specify, Alfa Laval can also deliver pump-driven HRSG

systems.