PROPERTY CONTROL METHOD USING ANALYZER IN BLENDING SYSTEM

摘要

PURPOSE:To make it possible to move a computed deviation value to zero quickly by adding a property deviation value and the estimated value based on the product of the flow speed and the period of blend fluid to the computed property deviation value of the blend fluid, and computing a correcting-ratio value. CONSTITUTION:A correcting-ratio operating function part 74 computes a correcting ratio Ri so that a value EB becomes 0 based on the counted deviation value EB operated in a deviation computing function part 75 for every correcting period T1 and a deviation D of an initial-property setting value. The ratio correcting signals + Ri and - Ri are sent into a plurality of ratio setting parts 77b and 78b, and the correcting ratios are set. As a result, the multiplications of the ratios are performed in ratio-multiplication function parts 77a and 78a. Each component of each fluid is blended according to the multiplied result. In the operation in the function part 74, a feed-forward term (2K2.ei.Fi.Tv) (K2 is gain, ei is the property deviation value at this time, Fi is blend flow speed and Tv is correcting period) is added to the ratio correction with a feedback value based on the value EB as the result of the conventional property.