Technological Chanllenges
Solution by Lattice Technology
The BOG Spray Recondenser of LATTI-CE consists of the BOG recondensing unit and the LNG subcooling unit as shown in the figure. The recondensing unit is a tank half filled with LNG.
Part of the LNG discharged from the recirculation pump is recycled to the spray nozzles, and the rest is delivered to the LNG subcooling unit and ultimately to the spray nozzles.
Operation of the BOG Spray Recondenser is continuous and steady. The incoming BOG during the BOG transfer sub-operation is mixed with the sprayed LNG. This leads to increase in the pressure and temperature of the LNG. Consequently, the pressure of the BOG recondensing unit increases on
over the sub-operation. As the BOG supply is stopped for the LNG transfer sub-operation, the low-temperature LNG from the LNG subcooling unit, which is typically a nitrogen refrigeration system, starts to cool downthe LNG and finally brings thepressure and temperature back close to the initial state. Over the both sub-operations, the rate of the LNG circulation and the load of the LNG subcooling unit are kept constant to attain the steady operation.