Flue gas circulating denitration sintering system and sintering method thereof

The invention discloses a flue gas circulating denitration sintering system and a sintering method thereof. The flue gas circulating denitration sintering system comprises a sintering machine, a firstflue gas cover, a first fan, a denitration pipeline and a reduced gas pipeline. The sintering machine is sequentially divided into a sintering section and a denitration section in the trolley advancing direction, multiple first air bellows are sequentially arranged on the sintering section below a trolley in the length direction of the sintering section at intervals, and outlets are formed in thebottoms of the multiple first air bellows and communicate with one end of the denitration pipeline. The other end of the denitration pipeline communicates with one end of the reduced gas pipeline through a first tee joint, and the other connectors of the first tee joint communicate with an air inlet of the first fan. An air outlet of the first fan communicates with an air inlet of the first fluegas cover, the first flue g