Eastern Junggar coal concurrent boiler drainage system

Abstract

The invention provides an eastern Junggar coal concurrent boiler drainage system. Drainage pipelines are additionally arranged, when the content of iron ions of demineralized water in a first drainage pipeline is smaller than a preset first threshold value, the added drainage pipelines can be opened, demineralized water in a startup drainage tank can be discharged at the same time through the drainage pipelines, and therefore the washing time of an eastern Junggar coal concurrent boiler is shortened, the replacement speed of iron ions is increased, and the consumption of demineralized water raw water is reduced. In addition, the added drainage pipelines can be connected with a recovery device, and therefore demineralized water can be recycled, and energy conservation and consumption reduction are achieved.

Description

technical field

[0001] The invention relates to the technical field of boiler production in power plants, in particular to a Zhundong coal once-through boiler drainage system. Background technique

[0002] Since the once-through boiler does not have a blowdown system, in order to prevent scaling on the heating surface, the boiler feed water must require high-quality desalinated water, and desalinated water must be introduced into the boiler during the water supply stage and startup stage of the boiler. Regular flushing is used to remove salts and impurities from pipes and heating surfaces. During cold flushing or hot flushing of once-through boilers, demineralized water passes through the water wall from the economizer to the start-up separator, and finally to the water storage tank. When the water quality of the desalted water is unqualified, the desalted water enters the drain tank after starting the expansion vessel to reduce the pressure, and then directly discharges to...

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