Optimal method for outlet temperature control of medium-speed pulverizers in thermal power units

Abstract

The invention relates to an outlet temperature control optimizing method of a medium-speed coal pulverizer of a thermal power generating unit. The method is characterized in that a PID (Proportion Integration Differentiation) adjuster is additionally arranged in control logic configuration of a DCS (Distributed Control System) of the thermal power generating unit, and linkage control logic is added to the control logic configuration of the DCS of the thermal power generating unit; a primary air pressure setting value correction control loop port based on the outlet temperature control optimization of the medium-speed coal pulverizer is added to primary air pressure control loop configuration of the control logic of the DCS of the thermal power generating unit, and primary air pressure setting value correction linkage control logic output is introduced to the primary air pressure setting value correction control loop port based on the outlet temperature control optimization of the medium-speed coal pulverizer to be used as the primary air pressure control correction; and the DCS is put into actual operation, and the parameters of each control loop in the outlet temperature control of the medium-speed coal pulverizer of the thermal power generating unit are adjusted online, so as to achieve the expected effect. The method is high in real-time performance, simple in on-site debugging process, and conveniently carried out in engineering.

Description

technical field [0001] The invention belongs to the technical field of automatic control of thermal power generating sets, and in particular relates to a method for controlling and optimizing the outlet temperature of a medium-speed coal pulverizer of a thermal power generating set. It can be used to automatically control the outlet temperature of the medium-speed coal mill during the actual operation of the thermal power unit to ensure that the outlet temperature of the medium-speed coal mill is automatically controlled within a reasonable range during the operation of the unit. Background technique [0002] During the actual operation of thermal power units, there are often problems such as variable coal types ground by the medium-speed coal mill and inaccurate measurement of the primary air volume at the inlet of the medium-speed coal mill, resulting in unstable control of the outlet temperature of the medium-speed coal mill. Low, in severe cases, it will affect the safe ...

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Problems solved by technology

[0004] The above documents mainly elaborate on the benefits of increasing the outlet temperature of the coal mill, parameter setting of the cold air door baffle of the coal mill, etc., and draw conclusions from experiments and parameter setting methods. There is no targeted research on the coordinated actions of the door, the hot primary air regulating door, and the outlet pressure control actuator of the primary fan to ensure that the outlet temperature of the medium-speed coal mill meets the requirements

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