Middle-storage low speed coal mill load switch control method

A technology of steel ball coal mill and control method, applied in the direction of adaptive control, electric controller, electrical program control, etc.

Inactive Publication Date: 2009-05-13
NORTHEASTERN UNIV +1
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Problems solved by technology

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 operat...

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  • Middle-storage low speed coal mill load switch control method
  • Middle-storage low speed coal mill load switch control method
  • Middle-storage low speed coal mill load switch control method

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Embodiment Construction

[0065] The load switching method of the mill is applied to the alumina rotary kiln pulverization system of an aluminum plant in China in conjunction with the accompanying drawings, and the load switching control method of the intermediate storage steel ball coal mill of the present invention is further described.

[0066] like figure 1 As shown, the pulverizing system adopted provides qualified pulverized coal for the combustion of the rotary kiln, and produces pulverized coal by using the waste heat generated by clinker cooling. In the load control of the coal mill, since the waste heat of sintering is used to produce pulverized coal, the temperature of the hot air is low and changes frequently, so the cold air door is usually fully closed and the hot air door is fully opened, so that the system can obtain the maximum heat energy, mainly by adjusting the speed of the coal feeder Control mill load.

[0067] The specification of the steel ball coal mill is Φ3.2×9.5m, the desig...

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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 ...

Claims

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Application Information

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IPC IPC(8): B02C25/00G05B19/04G05B11/42G05B13/02B02C17/00
Inventor 张立岩岳恒丁进良柴天佑
Owner NORTHEASTERN UNIV
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