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

A technology of steam temperature and control method, which is applied in control systems, electrical program control, components of steam boilers, etc., can solve problems such as failure to timely and accurately issue a rapid temperature drop alarm or protection action signal, and an unsatisfactory logical judgment effect.

Active Publication Date: 2020-10-30
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment

[0064] This embodiment is based on the logical configuration of the decentralized control system of a 1000MW thermal power unit, and implements an early warning control method for a rapid drop in steam temperature of the thermal power unit.

[0065] The parameters of this embodiment are set as follows: the logic scan period of DCS is 100ms, and the warning period value T 0 It is 10 minutes, which is consistent with the relevant regulations on electric power. The sub-time period ΔT is 5s, the number of sub-time periods N is 120, the alarm limit for steam temperature drop is 30°C and 40°C, and the warning limit for shutdown protection is 50°C.

[0066] Considering that in general, the main steam / reheat steam temperature on the boiler side drops much faster than that on the turbine side, in order to ensure the safety of the unit and prevent water from entering the turbine, the temperature on the turbine side can more truly reflect the temperature of the steam entering the turbine,...

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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...

Claims

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Application Information

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IPC IPC(8): G05B19/418
CPCF01D21/12F22B35/00F22B37/47Y02P90/02
Inventor 吴坡张江南贺勇任鹏凌李冰王震唐耀华王丹
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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