Ambient vaporizers are used to vaporize cryogenic liquids to gaseous form using the heat from ambient. Typically these vaporisers employ star fin aluminium extrusion tubes to provide efficient heat transfer due to large surface area & low pressure drops.
These vaporisers are extremely lightweight & compact designed for long-lasting service. These vaporisers are corrosion & temperature resistant and require no maintenance at all. These are also easy to assemble and can be easily set up without much of welding at site. Our air-heated vaporisers feature an efficient, fin-tube design and designed for pressure up to 40 bar. These can be designed for wind-loads of up to 160 km/h (100 mph). These vaporisers can be designed to meet the seismic requirements of up to UBZ-zone 4. The external and internal surfaces are optimised for maximum convection heat transfer. The vaporisers are designed in accordance with ASME Section VIII, Division 1 which will achieve highest structural strength to cost ratio.
Alternate designs are available with forced draft fan to improve heat transfer co-efficient for increased capacity for the given foot print.
Salient design features
Airgases Projects ambient vaporisers offer following salient design features
STEAM/WATER HEATED VAPORIZERS
Water bath vaporizers are robust & reliable solution to vaporize large quantity of cryogenic liquids with help of external source of energy such as steam or hot circulating water. In these vaporisers a coiled tube bundle or multiple coiled tube bundles each carrying cryogenic liquid is immersed in water bath which provides high heat transfer rate in these vaporizers. These vaporisers are used to vaporise large volumes (few thousands to several hundred thousand NM3/hr) of liquefied gases such as oxygen, nitrogen, argon, ethylene, propylene, and natural gas. Multiple steams of different liquefied gases can be vaporised in one vaporiser.
Each unit comprises a CS vessel with an overflow nozzle in which
a coiled tube bundle is submerged. The water bath is either heated by
steam injected directly into the water through spargers or hot water
is circulated to take away cold from vaporising liquids inside tube
bundles. The flow of steam is adjusted by water temperature controllers.
The tubes are welded into a header pipe which distributes liquids and also
collects gas. The bundles can be removed to provide easy access for cleaning
and inspection. At times additional water circulating pumps can be provided
for quick stabilisation. Alternative heating sources such as warm water,
electrical heaters
or combinations of these can also be used if available.
