METHOD AND SYSTEM FOR MEASURING CALORIE OF LIQUEFIED NATURAL GAS

摘要

PROBLEM TO BE SOLVED: To provide a method and a system for measuring calories of liquefied natural gas for improving measurement accuracy of a gas calorific value of the liquefied natural gas.;SOLUTION: A method and a system for measuring calories of liquefied natural gas are constituted so that density operation means 13 calculates liquid density D_x of liquefied natural gas to be measured by the following liquid density derivation function from liquid density D_w, reference temperature T_w, and characteristic frequency relevant information F_w of first reference fluid, liquid density D_a, reference temperature T_a, and characteristic frequency relevant information F_a of second reference fluid, temperature T_x and characteristic frequency relevant information F_x of the liquefied natural gas to be measured, and a coefficient α on the basis of storage information of density operation information storage means 11, measurement information of temperature measurement means 7, and detection information of frequency relevant information detection means, and the coefficient α is set to a numeric value according to the temperature T_x of the liquefied natural gas to be measured. D_x=f[D_w,D_a,F_x²×(1-α×T_x),F_a²×(1-α×T_a),F_w²×(1-α×T_w)].;COPYRIGHT: (C)2013,JPO&INPIT