Patent ID: 6033102
Filing Date: 2000-03-07
Classification: C04B

Abstract:
A method for controlling the mixing of raw materials for cement, comprising:measuring the component contents of a sample material obtained at an exit side of a mill system, in which raw materials for cement are mixed, to obtain measured modulus values of modulus parameters of a raw material mixture;determining estimated modulus values of the component contents at the mill system exit side based on current takeout amounts of the raw materials, a mill system passage characteristic model, a raw material component content measuring instrument passage characteristic model, and preset component contents of the raw materials to be mixed;calculating modulus deviation values based on differences between the estimated modulus values and the measured modulus values;adding values, obtained by passing the modulus deviation values through a noise removal filter, to future modulus values of the component contents at the mill system exit side calculated based on the current takeout amounts of the raw materials and the preset component contents of the raw materials to be mixed to determine predicted modulus values for calculation of updated takeout amounts; andadjusting the predicted modulus values to follow predetermined target values while considering a balance among the modulus values of the plurality of modulus parameters and the capacities of feeders of the raw materials to be mixed, to calculate the updated takeout amounts of the raw materials.