Method and system for controlling mixing of raw materials for cement

A system for controlling the mixing of raw materials for cement, comprising:

• a measuring unit which measures 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;
• a determining unit which determines 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;
• a calculating unit which calculates modulus deviation values based on differences between the estimated modulus values and the measured modulus values;
• an adding unit which adds 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;
• and
• a control unit which calculates the updated takeout amounts of the raw materials based on information from the measuring unit, the determining unit, the calculating unit, and the adding unit, wherein
• said control unit adjusts 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.

A method for updating takeout amounts of raw materials for cement, comprising:

• measuring actual modulus values of component contents in a mixture of the raw materials;
• determining estimated modulus values of the component contents based on current takeout amounts of the raw materials;
• calculating modulus deviation values based on said measured actual modulus values and said determined estimated modulus values;
• calculating future modulus values based on said current takeout amounts of the raw materials and predetermined component contents of the raw materials to be mixed;
• calculating predicted modulus values based on said calculated modulus deviation values and said calculated future modulus values;
• and
• updating takeout amounts of the raw materials based on said predicted modulus values and predetermined target modulus values such that said predicted modulus values coincide with said predetermined target modulus values.