Starting method of non-starting steam after tripping of power generating set of thermal power plant

Abstract

The invention provides a starting method of non-starting steam after tripping of a power generating set of a thermal power plant. The starting method comprises the following steps that after the powergenerating set is tripped, a boiler starts to quickly purge; a low-pressure bypass electric door on an inlet pipeline of a steam exhaust device is closed, and a high-pressure bypass electric door connected to a pipeline between a boiler superheater outlet and a boiler reheater inlet is opened, so that a reheating cold section is connected to a steam turbine shaft seal steam source, the normal steam supply of the shaft seal is maintained to be not interrupted, and the steam turbine is prevented from entering the cold steam cold water; the situation that the generating set trips due to the factthat a boiler main device is damaged is confirmed, a plurality of oil guns are put into for heating and boosting; when all the oil guns are normally combusted, a coal mill is started for heating andboosting; when a starting parameter of the generating set meets the condition that a preset extreme-heat-state punching parameter is met, steam turbine punching is carried out immediately; and grid connection with loads is carried out. According to the method, the steam-free starting under the thermal condition of the power plant can be realized without establishing a starting boiler and without being connected to the peripheral power plants.

Description

technical field [0001] The invention relates to the technical field of boiler production in power plants, in particular to a method for starting without starting steam after a thermal power plant generating set trips. Background technique [0002] In thermal power plants, in order to ensure the safety of boilers, steam turbines and other equipment and meet the requirements of process effects, steam is often used in the start-up process of generator sets, including boiler ignition oil system heat tracing and oil gun purge steam, boiler water pressure test heating steam , pre-baking furnace heating steam, boiler heating surface cleaning heating steam, boiler water heating steam before ignition, steam turbine shaft seal heating steam before running, and deaerator heating steam, etc. These steams are collectively referred to as starting steam. The use of start-up steam is related to whether the generator set of a thermal power plant can be started and put into production safely ...

AI Technical Summary

Problems solved by technology

However, if the pipeline for starting the steam needs to be overhauled, the thermal power plant will completely lose the starting steam source during the whole overhaul period. At this time, once the generator set trips, it cannot start immediately, thus reducing the time between the tripping of the generator set and its restart. electricity production; and during this period, also need to maintain the boiler burning, so also wasted fuel oil for this period

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