The activated carbon method of layered cross-flow divides the adsorption tower bed into three layers: front, middle and back, which reduces the enrichment of HCl and eliminates the adsorption heat benefit of high concentration of SO₂ by controlling the blanking speed of different beds, which has good stability and strong gas adaptability. Aiming at the activated carbon gas purification system of 265 m² sinterstrand in an iron and steel enterprise, the ultra-low emission operation of sintering gas with high sulfur content and high dust mass concentration is introduced, and the operation advantages of the new single-control circulating conveying mode in the actual operation process are analyzed in detail, and the air screen is optimized and the improvement measures, such as the application of gravity dust collector, are introduced. The results show that the new single-control circulating mode not only ensures the removal efficiency of sulfur nitrate, but also has the advantages of lower dust emission, lower HCl concentration, reduced denitrification side reaction, lower ammonia consumption, and reduced overall circulating volume of activated carbon. After optimized design of the air screen, the uniformity of the internal flow field and the utilization efficiency of the air volume of the blast air are improved, this can prevent material blockage and greatly reduce the number of ultra-fine activated carbon powder. After the addition of gravity dust collector, the loss of activated carbon is reduced by 10%-20%. After the operation of the system, the mass concentrations of SO₂ and NO_x are lower than the ultra-low emission limit, and the calculated removal rate of SO₂ and NO_x reaches 99.7%-100.0% and 82.5%-87.3%, respectively.