Thermoelectric generating set auxiliary machinery fault fast-reducing load feed water pump trip behavior feasibility determination method

Abstract

The invention relates to a method for determining feasibility of the working condition of water feed pump tripping operation by runback of auxiliary failure of a thermal generator set. The method comprises the following steps that: (1) the water deficit amount allowed by a boiler steam header is determined when the water feed pump tripping operation runs back; (2) the smallest beginning time of the runback t1 is determined; (3) the smallest continuous time of the runback t2 is determined. The method has the advantages that: the method can carry out determination and evaluation to the feasibility of water feed pump runback and improve the success rate of the water feed pump runback and the safe operation level of the generator set.

Description

Feasibility determination method for rapid load reduction feedwater pump tripping condition of thermal power generation unit auxiliary equipment failure technical field The patent of the present invention relates to a method for determining whether the unit can operate safely when the auxiliary machine of the thermal power generation unit fails (trips) and the unit quickly reduces load (hereinafter referred to as RUNBACK) (feed water pump tripping condition). Automatic control and protection system for large generator sets. technical background In the actual operation of the steam drum boiler of a large-scale unit, the water level is too high or too low will lead to serious accidents. In order to ensure the safe operation of the unit, there are strict requirements on the boiler drum water level control. Although domestic and foreign experiments and analyzes have been carried out on the RUNBACK working condition of the feed water pump of many units, the water level of the s...

AI Technical Summary

Problems solved by technology

Although domestic and foreign experiments and analyzes have been carried out on the RUNBACK working condition of the feed water pump of many units, the water level of the steam drum is often too low when the feed water pump is in the RUNBACK working condition of the large-scale unit, causing the unit to trip.

For a large 600MW unit, when a group of water pumps trips, it is difficult to adjust the load distribution of steam pumps and electric charges in a timely manner even if the backup pumps are started together, resulting in a serious shortage of water supply in a short period of time

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