Coal mill inlet air pressure and capacity air volume linkage control method, system and device

Abstract

The invention discloses a linkage control method, a linkage control system and a linkage control device for the inlet air pressure and the capacity air volume of a coal mill. The method comprises the following steps: obtaining an input value of a capacity air door of the coal mill; comparing the input value of the capacity air door with upper and lower threshold values of a preset input value of the capacity air door; obtaining a hot air pressure and capacity air volume linkage triggering direction instruction; obtaining the dynamic value of an inlet air pressure setting value offset through combination with preset inlet air pressure setting offset target values and inlet air pressure setting value offset change rates; integrating a preset inlet air pressure setting value with the dynamic value of the inlet air pressure setting value offset to obtain inlet air pressure control quantity; controlling the inlet air pressure of the coal mill to enable the opening degree of the capacity air door of the coal mill to be adjusted in an adjustable linear region. According to combination with a coupling relationship between the inlet air pressure and the capacity air of the coal mill, the inlet primary air pressure and the capacity air volume linkage conditions of the coal mill are controlled and adjusted, the integral saturation phenomenon easily caused by a capacity air control loop can be inhibited, and the controllability and the adjustment quality of the full-load range of the capacity air door are effectively improved.

Description

technical field [0001] The invention relates to the technical field of coal pulverizers, in particular to a method, system and device for linkage control of coal pulverizer inlet air pressure and capacity air volume. Background technique [0002] Due to the variety of coal types used by domestic thermal power units, it is more and more common to configure double-inlet and double-outlet coal mills. However, the effective opening range of the capacity damper of the coal mill is narrow, and when the damper reaches the upper limit (or lower limit) of the effective opening, integral saturation occurs. At this time, when the boiler and fuel main control increase (or decrease), the capacity air volume cannot actually respond. It directly affects the adjustment quality of the boiler combustion control system. Contents of the invention [0003] Based on this, it is necessary to provide a method that can truly and accurately respond to the increase (or decrease) of the main contro...

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Problems solved by technology

[0003] Based on this, it is necessary to provide a method that can truly and accurately respond to the increase (or decrease) of the main control of the boiler and fuel, which seriously affects the normal operation of the combustion boiler, for the control method of the capacity and air volume of the double-inlet and double-outlet coal mill. , Coal mill inlet air pressure and capacity air volume linkage control method, system and device that accurately respond to the increase (or decrease) of the main control of the boiler and fuel, to ensure the normal and safe operation of the combustion boiler

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