Method and system for preventing boiler heating surface from being contaminated through circulation of wearable materials

The invention discloses a method and a system for preventing a boiler heating surface from being contaminated through circulation of wearable materials and belongs to the field of boilers. The method comprises the following steps of sending mixtures of the wearable materials and granular fly ash into burning wind region of a boiler, mixing the mixtures with exhaust gas of the boiler, and circularly recycling the wearable materials and the granular fly ash. The system comprises a circulated material caching tank, wherein a material outlet of the circulated material caching tank is communicated with the burning wind region of the boiler, a material inlet of the circulated material caching tank is communicated with a coal economizer ash bucket, a denitration inlet-outlet ash bucket, an air pre-heater ash bucket in the boiler as well as one or multiple parts in a first electric field of a dust remover, the circulated material caching tank is provided with a material feeding hole, and a pipeline for communicating the material outlet of the circulated material caching tank with the burning wind region of the boiler is further communicated with a primary hot wind branch pipe. by utilizing the method and the system, the convection heating surface of a high-sodium coal burning boiler can be prevented from being contaminated, the heating surface can be prevented from being seriously contaminated with low initial investment and operation costs on the basis that the structure of the boiler is basically unchanged, and the Zhundong (a region in a Uygur Autonomous Region) high-sodium coal can be completely burnt by the boiler.