Bypass system for reducing dry-wet critical load point of supercritical unit and operation method

The invention discloses a bypass system for reducing dry-wet critical load point of a supercritical unit and an operation method. According to the technical schemes of the invention, the bypass systemcomprises a bypass flue, a first cooling chamber, a second cooling chamber, a front ash discharging hopper, a rear ash discharging hopper, an adjusting baffle, an isolation baffle, a first connectingchannel and a second connecting channel. The bypass system conveys part of high-temperature flue gas to the flue gas side of a coal economizer, so that water supply heat absorption capacity in the coal economizer is improved; and therefore, the superheat degree of steam is properly increased with the same fuel quantity required as the prior wart, and the dry-wet state critical load point of the unit is reduced. The bypass system is provided with the cooling chambers; and therefore, cooling protection is provided for the bypass flue, the adjusting baffle and the isolation baffle, it is guaranteed that the baffles act f