Method for starting once-through boiler with boiler circulating pump when boiler circulating pump breaks down

Abstract

The invention discloses a method for starting a once-through boiler with a boiler circulating pump when the boiler circulating pump breaks down. The method specifically comprises the starting steps that the boiler starts to be cleaned; the water temperature of a deaerator is gradually increased while the boiler starts to the cleaned; when the boiler is ignited, the feedwater flow of an inlet of a coal economizer is controlled to be 500 t / h; after the boiler is ignited, power of a starting drainage pump A is controlled to be 16 t / h; the drainage pump runs when the boiler is started; combustion is intensified properly while impulse starting and grid connection are carried out; the opening degree of a bypass needs to be adjusted in time as needed; when the boiler is switched to the dry state, the overflow quantity of a water storage tank is zero, the boiler has no medium loss any more, and switching between the dry state and the wet state is carried out with the load ranging from 180 MW to 240 MW; and after the boiler is switched to the dry state, startup without starting the circulating pump is completed. The method ensures that a system can start a unit safely when the boiler circulating pump breaks down, and great economic losses caused after the primary device breaks down and a boiler cannot be started are recouped for business owners.

Description

technical field [0001] The invention relates to the field of generator sets, in particular to a method for starting a direct current boiler with a boiler water circulation pump under the condition of a failure of the boiler water circulation pump. Background technique [0002] The advantages of the built-in generator set with boiler water circulation pump starting system are simple and reliable, easy to operate, small disturbance of steam temperature, conducive to the safe operation of the turbine, and the separator can be recovered when the turbine starts and stops and operates at low load (<30%) Hydrophobic energy, recovery of working fluid, large flow water flushing of the boiler, small wall thickness, low thermal stress, flexible startup and shutdown of the boiler, etc. The boiler water circulation pump is an important core equipment of the system. If the boiler water circulation pump fails, various difficulties and uncertain factors will be encountered during the sta...

AI Technical Summary

Problems solved by technology

This technical solution is to control the heating of the cooling plate and cannot be used to solve the starting method of the DC boiler with the boiler water circulation pump in the case of the failure of the boiler water circulation pump.

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