Energy Saving by Installing Cold-Water Type LNG Vaporizer

Abstract

Rengo Takefu Plant manufactures cellophane, viscose processed paper, porous-cellulose beads, tinted film and other functional products.
In the past, the plant had been using a hot-water type LNG vaporizer, which sourced heat from steam to fuel the boiler with natural gas. On the other hand, the cold-water type LNG vaporizer we have recently installed utilizes heat from cool water used in the manufacturing process instead of steam.
After introducing the current vaporizer system, we have achieved an energy saving by reducing the steam consumption used to vaporize LNG. In addition, due to evaporative heat removal by LNG, the vaporizer generates cold water which can be utilized in the manufacturing process of cellophane, and thus we have reduced the load of a refrigerating machine creating the cold water. The specific consumption of LNG and the power consumption of the refrigerating machine have reduced by 3.5% and 5.5% respectively.