Flue gas denitration system for first-section furnace of methanol device

The utility model discloses a flue gas denitration system for a first-section furnace of a methanol device, which comprises a metering and distributing system, a first-section furnace flue gas denitration system and a second-section furnace flue gas denitration system, the injection system comprises a top spray gun and side spray guns, the top spray gun is mounted at the front end of the transition section corresponding to the flue outlet, and the side spray guns are mounted on two side walls of the transition section. An original flue does not need to be changed, only the ammonia water spray guns need to be installed at the front end and the side face of the transition section corresponding to the flue outlet, ammonia water comes from the newly-added ammonia water preparation tank, atomized air comes from a plant air supply pipe network, other devices do not need to be additionally arranged for providing the ammonia water or the atomized air, cost is reduced, and the risk is small. 本实用新型公开了一种甲醇装置一段炉烟气脱硝系统，包括