Method and assembly for regulating the grind drying procedure of a coal dust ventilator mill

Abstract

The present invention provides a method for controlling grind drying procedure of a coal dust ventilator mill, in particular a method for controlling grind drying procedure for brown coal, wherein the method controls at least parameters such as milling speed, temperature after milling and primary air quantity, which involves pre-control curves (VSK[grind rotation speed]) for controlling the milling speed, pre-control curves (VSK[temperature after milling]) for controlling the temperature after milling and pre-control curves (VSK[primary air quantity]) for controlling the primary air quantity, where the pre-control curves (VSK[grind rotation speed], VSK[temperature after milling], VSK[primary air quantity]) are determined depending on coal throughput. The pre-control curve (VSK[grind rotation speed]) of the milling speed is corrected depending on a state of wear (V[IST]) of a mill-tool of a coal dust fan mill. An independent claim is also included for an arrangement for controlling a pulverized drying process of raw lignite, wherein the corresponding curves have minimum curves and maximum curves.

Description

technical field [0001] The invention relates to a method and a device for controlling the grinding and drying process of a pulverized coal-blast mill. Background technique [0002] Coal pulverization - blast mills or impact mills are used in power plants where fossil solid fuels, especially raw lignite, are dried and ground into coal dust, which is then crushed through pulverized coal pipelines It is delivered to the burner and burned in the combustion chamber or combustion mechanism of the steam generator. Hot combustion exhaust gases are used for drying and conveying the ground material, which are drawn from the upper region of the combustion chamber and drawn through the flue gas suction shaft of the forced-air mill. Raw fuel or lignite to be ground and dried is usually provided in coal bunkers and conveyed via bunker unloaders and / or coal feeders to the flue gas-suction shaft, or via the flue gas- The suction shaft is conveyed to the pulverized coal-blast mill. In ord...

AI Technical Summary

Problems solved by technology

Coarsening of the combustible pulverized coal also leads to a worsening of the conveying conditions in the spiral part of the mill and in the connected pulverized coal pipeline

For separating crushers, i.e. for blast mills with a separator arranged at the outlet of the pulverized coal, this also leads to an increase in the internal solids circulation, because a large amount of coarser ground material is again feed to grinder

For impact mills and mills with separators, worn corner guards increase gas / solids circulation in the spiral section and lead to deterioration of grinding and combustion conditions

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