A PLAN FOR OPERATING COST REDUCTION AND TECHNOLOGY DEVELOPMENT OF LNG VAPORIZING SYSTEM PLAN DE REDUCTION DES COUTS D'OPERATION ET DE DEVELOPPEMENT DES TECHNOLOGIES POUR LE SYSTEME DE VAPORISATION DU GNL

摘要

This study was performed to establish an effective operating plan to reduce the operating cost of LNG vaporizing system in Incheon R/T (Receiving Terminal), and to develop a bench scale new type LNG vaporizer for lower seawater temperature. To reduce the operating cost, we first analyzed the double train pump-seawater pipeline network with the modified Linear Theory Method and the thermal performance of ORVs (Open Rack Vaporizers) with the modified Wilson Plot Technique. From the results, we estimated the unit cost of ORVs operation with the flow rate and the temperature of seawater and were able to determine an effective operating mode of LNG vaporizing system in Incheon R/T. To develop new type vaporizer, we investigated two models: 1Body-1HX (Heat eXchanger) with double tubes and 1Body-3HXs with single tubes, in applying an intermediate fluid so as to overcome seawater icing of ORVs. In particular, the intermediate fluids were investigated to apply freons or hydrocarbons. In the first year, we performed basic analyses and fabricated a batch type vaporizer. In the second year, we will create a bench scale vaporizer to modify and improve on the problems of the characteristics of its structure and heat transfer, and then, will perform a final bench scale vaporizer test for its performance verification. Also, we are planning to demonstrate its realization for a real-scale system with scale-up parameters in conclusion. Consequently, we have established an operating plan for the LNG vaporizing system in Incheon R/T and driven the development of a new type vaporizer to positively resolve the icing problem of ORVs in the winter season.