An early warning control method and system for a rapid drop in steam temperature of a thermal power unit

Abstract

This application relates to an early warning control method and system for a rapid drop in steam temperature of a thermal power unit, including: (1) divide the early warning period evenly into several sub-time periods, and when the cycle time reaches different sub-time periods, count the sub-time periods respectively The maximum value of the steam temperature in the time period, and the maximum value of the steam temperature in the early warning time period is obtained after the high value is selected; (2) Calculate the steam temperature drop value in the early warning time period; (3) The steam temperature drop in the early warning time period When the value exceeds the alarm limit, an alarm will be issued, and when it exceeds the warning shutdown threshold, after the quality judgment of the additional measuring point, a steam temperature rapid drop protection signal will be generated; (4) different steam temperature rapid drop protection signals of multiple measuring points will be judged by switching value , to determine the trip protection signal. The invention can accurately and effectively judge the rapid drop of the steam temperature, send a trip protection signal in time, and is beneficial to the safe and stable operation of the generator set.

Description

technical field [0001] The application belongs to the technical field of thermal automation control for thermal power generation, and in particular relates to an early warning control method and system for a rapid drop in steam temperature of a thermal power unit. Background technique [0002] In the "Twenty-five Key Requirements for Preventing Power Production Accidents", it is stipulated that "when the unit is running normally, if the temperature of the main steam / reheat steam suddenly drops by 50°C within 10 minutes, it should be shut down immediately." In the "Technical Regulations for Thermal Protection System Design of Thermal Power Plants", it is required: "During the operation of the steam turbine, when the temperature of the main steam or reheat steam drops rapidly by 50°C or above or the steam temperature drops beyond the specified value, it should be shut down immediately." [0003] During the operation of the generator set, if there are special working conditions...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: in order to solve the problem in the prior art that the logical judgment effect on the rapid drop of steam temperature through the decentralized control system is not ideal, and the problem that the alarm or protection action signal of the rapid drop of steam temperature cannot be issued in time and accurately, thereby providing a Early warning control method and system for thermal power unit steam temperature drop rapidly

Images