Automatic control method for realizing boiler thermal-state cleaning by supercritical machine set

Abstract

The invention discloses an automatic control method for realizing boiler thermal-state cleaning by a supercritical machine set, which comprises the following step: performing matching control on a coal feeder, a recirculation flow regulating valve of a boiler water circulating pump, a high-voltage bypass regulating valve of a steam turbine and a feedwater device respectively according to the changes of correlation parameters of a system, such as fuel quantity, boiler water inlet flow, the recirculation flow of the boiler water circulating pump, steam pressure and temperature of the system and the like, in thermal-state pre-cleaning, in-cleaning and post-cleaning three stages of a boiler of a boiler steam generator set system to realize the stable inlet temperature of a vapour-water separator during cleaning of the boiler of the supercritical machine set in the thermal state. The method can simply and conveniently realize the stable inlet temperature of a vapour-water separator during cleaning of the boiler of the supercritical machine set in the thermal state, and ensure that the boiler thermal-state cleaning process is smooth.

Description

technical field [0001] The invention relates to the field of boiler steam transmission systems, in particular to an automatic control method for a supercritical unit to realize thermal cleaning of a boiler. Background technique [0002] The steam turbine high-pressure bypass control in the existing boiler steam generator system generally adopts a fixed-slip-fixed control strategy to cooperate with the boiler to complete the process of increasing temperature and pressure and generating unit load. When the boiler is ignited and started, the function curve control is adopted, and the high-pressure bypass valve of the steam turbine is gradually opened according to the main steam pressure signal to ensure that the temperature change rate of the saturated steam of the steam-water separator does not exceed the limit value of 2.0°C / min. When the two burners or plasma heating devices are put into operation and the main steam pressure reaches 9.4MPa 5 minutes after reaching the pressu...

AI Technical Summary

Problems solved by technology

This traditional method cannot guarantee the stability of the inlet temperature of the steam-water separator during the hot cleaning process, and the water-cooled wall of the boiler is easily affected by temperature changes and produces too many residues to block the steam pipe and condensation pipe

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