Working principles

The Alfa Laval Aalborg HPNC boiler is designed to operate

in a closed loop system, a so called thermo syphon system,

where circulation is ensured through gravity. The steam cycle

is completely sealed off to remove any risk of corrosion.

Steam generation is taking place in two concentrically

arranged coils – the inner coil which forms the furnace and

the outer coil which provides for convective heat transfer

through the second and third gas passes.

Depending on boiler size each coil can consist of one single

flow way or several parallel flow ways. This design ensures

sufficient and reliable circulation and thereby also cooling of

all the heat transfer parts of the boiler.

Standard equipment

As a standard the high pressure boiler is fitted with the required

accessories for a safe and reliable operation, including safety

valve, rupture disc assembly and low water level cut-off

electrodes.

Burner equipment includes pressure jet burner for fuel oil, gas

or a combination hereof as well as the required equipment for

fuel line system.

The boiler system can be filled with water using a vacuum

system or by using the optional high pressure filling pump.