Three ways to vaporise: ambient air, electric and steam
The choice between the three routes is not about sophistication. It is about whether the site has hot water, whether it has steam, and what electricity costs.
By heat source, vaporisers fall into three types — ambient air, electric heating and steam heating. All three turn cryogenic liquid into gas at ambient temperature.
Ambient air: heat comes from the surrounding air through finned tubes. Advantages are no maintenance, no heat source, simple operation and zero electricity; drawbacks are output that swings with ambient temperature, noticeable derating in winter, and a larger footprint.
Electric: heating elements warm a water bath or the piping directly. Advantages are stable output independent of weather and a compact package; drawbacks are the electrical capacity required, heating elements as wear items, and high running cost.
Steam: a steam coil heats the water bath. Advantages are high and stable output; the drawback is that a steam source is needed, so it usually only pays where the plant already runs boilers.
The most common combination in practice is ambient air as the base load with a water bath for topping up: the air unit runs at zero energy cost year round, and the water bath adds heat in winter or at peak. At LNG stations in northern China this pairing has become standard.
The selection order is: first, does the site have steam or hot water — if so, favour the water bath; second, what electrical capacity and tariff apply — if acceptable, electric heating; third, what ambient temperature and peak demand look like, which sets the ambient-air rating and whether topping heat is needed.
Written by the Tairan engineering team from project records and standard documents. Please cite the source when quoting.