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Sub-merged combustion vaporizer

Introduction
A typical SCV system is shown in Figure 2. LNG flows through a stainless steel tube coil that is submerged in a water bath which is heated by direct contact with hot flue gases from a submerged gas burner. Flue gases are sparged into the water using a distributor located under the heat transfer tubes. The sparging action promotes turbulence resulting in a high heat transfer rate and a high thermal efficiency (over 98%). The turbulence also reduces deposits or scales that can build up on the heat transfer surface.

Advantages
SCV units are proven equipment and are very reliable and have very good safety records. Leakage of gas can be quickly detected by hydrocarbon detectors which will result in a plant shutdown. There is no danger of explosion, due to the fact that the temperature of the water bath always stays below the ignition point of natural gas.

The controls for the submerged combustion vaporizers are more complex when compared to the open rack vaporizers (ORV). The SCV has more pieces of equipment, such as the air blow, sparging piping and the burner management system which must be maintained. SCVs are compact and do not require much plot area when compared to the other vaporizer options.

Main process parameters for SCV

LNG capacity 200T/h
LNG density 0.44X1000Kg/m³
LNG outlet temperature 100℃
Sea water pump power 1500KW
Sea water pump capacity 8930m³/h
Inlet& outlet pressure 0.7MP

Process Flow

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