The invention discloses a low-NO<x> efficient chain grate furnace with a function of distributing air by area in the width direction of a grate. On the basis that air enters from the two sides of theposition below the grate, a primary
air chamber is divided into a grate left
air chamber body, a grate middle
air chamber body and a grate right air chamber body by subarea partition plates in the width direction of the grate, the grate left air chamber body, the grate middle air chamber body and the grate right air chamber body are three transverse small air chamber bodies, inlets of all the transverse small air chamber bodies are provided with adjustable air
doors, flow
equalization plates are arranged in the transverse small air chamber bodies, and accordingly, the condition for distributing the air by area in the width direction of the grate is built. The effect that based on the existing technology, air supply of the middle of a
coal seam is strengthened, and air supply of the two sides of the
coal seam is appropriately reduced, thus, primary air is relatively uniformly distributed in the width direction of the grate, the situation that the air pressure, the
air volume and the
airflow penetrating power of all the areas of the
coal seam are consistent with the air / coal diffusive
combustion condition is achieved, surplus escaped air above the coal seam is little and uniform, accordingly, the problem that when NO<x>
discharge is controlled through low-
oxygen combustion, coal is stacked in the middle of the grate, and as a result, the
burnout effect is poor is solved, the efficient low-
oxygen combustion condition of the grate areas is built, and the effects of being good in
burnout, low in
smoke exhaust loss and small in NO<x> generation amount are achieved.