Low-energy-consumption denitration device capable of utilizing decarburization heat energy

The utility model belongs to the technical field of denitration devices, and particularly relates to a low-energy-consumption denitration device utilizing decarburization heat energy, which comprises a gas inlet pipeline, a heating device arranged on one side of the gas inlet pipeline, a connecting pipeline arranged on one side of the heating device, a reactor arranged on one side of the connecting pipeline, and a decarburization reaction bin arranged in the reactor. An ammonia spraying grid is arranged at one end of the reactor, a spraying pipeline is arranged on one side in the ammonia spraying grid, an ammonia water evaporator is arranged at one end of the spraying pipeline, an ammonia water storage tank is arranged on one side of the ammonia water evaporator, and a gas outlet pipeline is arranged at the bottom end of the reactor; a decarburization catalyst placing rack is arranged in the decarburization reaction bin, and a denitration catalyst placing rack is arranged on one side of the denitration reacti