Methods for determining a volumetric ratio of a material to the total materials in a mixing vessel

摘要

Methods are provided for determining an estimated volumetric ratio of a material to total materials in a mixing vessel. In various embodiments, the methods may comprise: summing a commanded input flowrate of the material and a volumetric disturbance flowrate of the material being fed to the mixing vessel; estimating the output flowrate of the material exiting the mixing vessel; negatively feeding back the estimated output flowrate of the material to obtain an estimated volumetric rate of change of the material in the mixing vessel; and integrating the estimated volumetric rate of change of the material to compute the estimated volumetric ratio of the material to the total materials in the mixing vessel.