DCHE is applicable to wide range of offshore use such as followings.
High pressure use and small foot print, such as:
Freezing control measures (increase of wall temp.)
HOT2 does not touch COLD (LNG).
HOT2 can be used to control the ice accretion level of HOT1.
(To prevent the HOT flow path from being completely blocked)
Measures to prevent freezing of heating medium at vaporizing zone and splash entrainment (increase of wall temp.)
Item | Heating zone (NG) | Vaporizing zone (LNG) |
---|---|---|
Channel pattern (Heat transfer efficient) |
Wavy (High) |
Straight (Normal) |
Heat transfer area × efficient | High | Low |
Wall temp. | High (Due to high heat transfer efficient) |
High (by heating medium temp.) |
Freezing condition evaluation test using LN2 (300 bar) and G.W.
Test condition
LNG flow rate: 150Nm3/hr
LNG Pressure: 6.5bar
LNG temp.: -125 °C (Design temp/: -160 °C)
Heating medium: Hot water
H.W. temp.: 50 °C/40 °C
H.W.flow rate: 9700 kg/hr
KSL confirmed characteristic structure of the DCHE (1: 3 & 2 Zone Design) are effective by two evaluation tests.