LNG Vaporizer
B.O.G(Boil-off gas) is generated while LNG is being transported, and this gas is utilized as fuel in steam turbine for sailing of LNG Carrier. Therefore, water-feeding shall be maintained very strictly on LNG Carrier. Meanwhile, the general-purpose-steam is supplied from the main boiler, and utilized to operate various auxiliary components of the ship. However, if those auxiliary component are defaulted or being operated incorrectly, feed-water could be mixed with boiler water, and eventually the life-time of boiler could be shorten. In this reason, the steam for mail boiler and general-purpose-steam are separated.
LNG RV/FSRU Regasfication System
sea water direct heating
combined open/closed loop with seawater and steam heating
- Min. equipment
- Control simple
- Min. Energy consumption
- High pressure vaporizer : Shell and Tube type heat exchanger
General Design Data
| ITEM | 200 MMSCFD | 150 MMSCFD |
|---|---|---|
| Surface (m²) | Gross 943.66 | Gross 806.01 |
| Heat exchanged (kW) | 36,656 | 28,031 |
| Design pressure (barg) | Shell 7.0 / Tube 135.0 | Shell 7.0 / Tube 135.0 |
| Design code | ASME, Class | ASME, Class |
| Tubes | OD : 19.05mmLength : 13.50m | OD : 19.05mmLength : 13.00m |
| Shell ID | 1450mm | 1350 mm |
Design Concepts
A. Steady Uniform Flow
Distributor installation on the channel
B. Anti-corrosion(Material of Tube : SMO 254)
To prevent corrosion due to seawater
C. Anti-Freezing
– Seawater inlet located in the low-temperature region
– To minimize shell side dead zone 
D. Structural Stablility evaluation / Quality Assessment
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LNG Heater / Vaporizer DongHwa Entec heat exchangers for LNG applications are of the shell and tube design and delivered for any BOG or LNG vapor duty according to customer specifications.Materials are typically 304L or 316L. Instrumentation and control valves will be part of the supply scope. | LNG Heater / Vaporizer – Test Model Verification Tests for Development The DongHwa Steam Heating LNG Vaporizer is a highly reliable vaporizer development through extensive verification tests as shown left. | LNGC – N2 Compander Package Unit N2 Compander is a re-liquefaction equipment which will be installed inside the 216K LNG vessel for the first time, now being built by three big domestic shipyards. It uses the nitrogen of extremely lowered temperature to change the natural boil-off gas, which originates from the cargo tanks of low temperature, to LNG and gets it back to the cargo tank. | LPG Cargo Heater / Vaporizer DongHwa cargo heaters and vaporizers are delivered as separate units or combined for both duties in the same shell.Typically cargo heaters are designed for sea water cooling with sea water on the shell side and tubes of corrosion resistant high Ni-alloy stainless steel 904L. Heat exchangers in all Titanium are also available. |
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| LPG Glycol Tank / Heater | LPG Glycol Heater |
