The main sintering exhausting system is one of the core systems of the sintering process. In order to realize the coarse dust removal of sintering flue gas, the sintering engineering design needs to arrange ash box, double-layer ash discharge valve and coarse dust conveyor belt and other equipment in the lower part of the main exhaust pipe, resulting in a significant increase in the overall height of the sintering plant, thereby increasing the engineering investment. From the perspective of plant design, a new scheme for the landing layout of the main exhaust pipe is proposed, and the impact of the new scheme on the design, engineering investment and output of the sintering system is discussed, which has guiding significance for the optimization design of sintering engineering. The results show that, by placing the main exhaust pipe on the ground, setting a buried scraper conveyor in the exhaust pipe, and adjusting the height of the sintering unloading hopper and the feeding chute of the ring cooler, the overall height of the plant can be reduced by about 7 m while meeting the requirements of the coarse dust removal process. After replacing the steel structure with reinforced concrete structure in the floor-to-ceiling main exhaust pipe, the amount of reinforced concrete is saved by about 24.6%, and after eliminating the ash box and double-layer ash discharge valve in the lower part of the main exhaust pipe, the air leakage rate of the sintering system is reduced by 3.5% and the output is increased by about 5.4%. The implementation of the new scheme can greatly reduce the investment cost and later operating cost of the project.