METHOD FOR PRESERVATION OF THERMAL CONDITION OF SHUT DOWN DRUM STEAM BOILER Russian patent published in 2014 - IPC F22B35/02 

FIELD: power engineering.

SUBSTANCE: external reheated steam of high pressure and external saturated steam are supplied into a shut down boiler with a return flow from common steam pipelines of the power unit, with discharge of cooled steam flows from intermediate points of the steam and water tract of the shut down boiler. Supply of the external reheated steam to the shut down boiler is carried out into a steam reheater via a control valve of bypass of the main steam valve of the high-pressure steam pipeline, and discharge of cooled reheated steam - along a line equipped with a control valve from relief pipes from the boiler drum to the steam reheater. If in the boiler 1 of the intermediate steam reheater they additionally supply external reheated steam of medium pressure into the intermediate steam reheater via the bypass of hot intermediate superheating with steam discharge via a drainage line of a cold intermediate superheating steam pipeline.

EFFECT: reliable operation under conditions of peaks and off-peaks of electric load.

2 cl, 2 dwg