Operation method for digesting large dead coke compost of hearth

The invention discloses an operation method for digesting large dead coke compost of a hearth. The operation method comprises the following steps that an upper charging system adopts a material distribution mode of reducing ore belt load, and the ore belt load is less than or equal to 7.0 as a standard; due to the fact that dead coke compost is large, the amount of center coke is controlled to be 10-15%; marginal ore belt load is controlled to be 4-4.5; the W value is controlled to be above 0.6 in operation; all-tuyere air supply and all-tuyere uniform blowing are realized; the coal injection ratio is controlled to be 140-150kg/t; a blast furnace with four tapholes adopts a three-taphole circulating tapping mode; stable raw fuel is adopted for supporting, screening is strengthened, and the content of furnace entering ore powder smaller than or equal to 5mm is lower than 1.5%; the silicon content of pig iron is controlled to be 0.35-0.55%, the sulfur content of the pig iron is controlled to be 0.025-0.4%, the