Coarser particles at the mill outlet originate from poor separation and decrease the unit efficiency.
It is a common experience that mill outlet pipes have unequal coal flow in each pipe and contain some coarse particles.
Air flow distribution at the mill throat, as well as inside the mill, significantly influences the mill performance in terms of separation, drying, coal/air flow uniformity at the mill outlet, wear patterns and mill safety.
Based on the dynamic mathematical model of coal mill, pulverized coal moisture was used as a feed-forward signal, and a feed-forward compensation controller was designed to optimize the coal mill outlet temperature.
The control scheme reduced the internal disturbances in the coal feed rate, thereby improving the tracking capability and control precision of the pulverizing system's output and enhancing the disturbance suppression capability of the mill outlet temperature.
However, in practical situations where measurements can be collected at the mill outlet only and with a relatively low sampling rate, the observer convergence deteriorates, as the sampling rate decreases, performance becomes similar to an asymptotic (simulation) observer.
However, in practical situations where measurements can be collected at the mill outlet only and with a relatively low sampling rate, the observer convergence deteriorates and, as the sampling rate decreases, performance becomes similar to an asymptotic (simulation) observer.
In this paper, the desiccant medium choice, desiccant medium composition and main design parameters (calculation of the oxygen content of the coal mill export, coal mill outlet temperature, calculation of coal moisture, coal fineness, air leakage coefficient of the system, primary air velocity of mill export) of direct-fired system of fan mill are analyzed in detail.
To choose the composition of dry medium, unit should be considered in different conditions, and calculate the oxygen in the mill outlet powder mixture to make it consistent with the requirements of inert atmosphere when using direct system of fan mill.
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