Method and arrangement for controlling the combined drying and pulverizing process of a fan mill for pulverizing coal

摘要

#$%^&*AU2008207358B220130214.pdf#####ABSTRACT A method for controlling the combined drying and pulverizing process of a fan mill for pulverizing coal, in particular the combined drying and pulverizing process of raw brown coal, wherein at least the parameters mill rotational speed, temperature downstream of the mill and quantity of primary air are controlled, comprising a pre-control curve (VSKm,,,Spd) for controlling the mill rotational speed, a pre-control curve (VSKemp after ml) for controlling the temperature after the mill, a pre-control curve (VSKprmoIquantit)f ) for controlling the quantity of primary air, wherein the pre-control curves (VSKmii speed/ VSKTemp after mii VSKrimar, quantity of air) are each determined as a function of the coal throughput, and the mill rotational speed pre-control curve (VSKmii speed) is corrected as a function of the wear state (Vadual) of at least one pulverizing tool of the fan mill and wherein the respective pre-control curves have minimum and maximum curves. (Fig. 5).3/4 Fig. 5 VSKmiii speed 100/ - -- - - I - - - i- :J0 -- - - -0 VStemp before coal 00 .0 L - -- ---- _ -. -- ~ - - -----------------------------0 - - - - - - - - - --- - -E~ 4--"0 ____________+ T ~1- -- - - -r- -r -o - - - - -~ - - I 0~ 1100 Coa throughput- [ - -]