Middle-storage low speed coal mill load switch control method

Abstract

The invention relates to a method for controlling the loading switching of an intermediate storage type steel-ball coal mill. The method is based on a system hardware platform of a coal mill and comprises the following steps: establishing a switching rule and adopting a rule-based reasoning method to judge the condition and conduct the control switching; designing the coordinated control on the temperature and the load, and adjusting the coal feed amount u(t) and coordinating and controlling the mill sound y(t) and the mill outlet temperature T(t) by adopting a load and temperature coordinated control algorithm based on PI; designing PI load control, and adopting a PT control algorithm to generate the control quantity u(t) so as to enable the mill sound to track a set value ysp; designing overload control based on the rule-based reasoning, and giving adjustment quantity (triangle u(t)) of the coal feed amount on the basis of the rule-based reasoning. The invention has the advantages that the automatic control of the mill load, the error 'ball package' and the error 'saturated milling' are avoided, the control reliability is improved, the workload of an operator is reduced, and the method contributes to the optimal control and the optimal operation of the mill load.

Description

technical field

[0001] The invention belongs to the technical field of automatic control, and in particular relates to a load switching control method of a middle storage type steel ball coal mill. Background technique

[0002] Improving the output of the medium-storage steel ball coal mill is of great significance for improving the pulverizing efficiency and reducing the power consumption of pulverizing. The output of the mill depends on the control of the mill load. Within the load range, having the highest possible output is the key to automatic control of the pulverizing system. Due to the complex and changeable working conditions of the load control of the mill, especially the pulverized coal at low temperature is prone to 'balling' failure, and the load is too high, it is prone to 'full grinding' failure, causing the mill to stop running. Manual operation is difficult for the operator The above-mentioned problems still exist in timely and accurate judgment of the hot ...

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