Low-nitrogen combustion device used for coal water slurry boiler

The invention discloses a low-nitrogen combustion device used for a coal water slurry boiler. The low-nitrogen combustion device comprises a hearth, a fan, a combustor head and a combustion chamber. Afuel inlet pipe is fixedly mounted at the position, close to the axis, in the hearth, a throat opening is arranged in the hearth, an inner circulating assembly is fixedly mounted at the position, located at one end of the throat opening, in the hearth and comprises a flue gas inlet, a second outlet and a first outlet, the first outlet is located at one end of the throat opening, the second outletis opposite to the combustion chamber, and the flue gas inlet is located on the outer side of the second outlet and the outer side of the first outlet and is opposite to the combustion chamber. Through the arrangement of the inner circulating assembly, after flue gas in the combustion chamber enters the inner circulating assembly along the flue gas inlet and the first outlet and is mixed with combustion-supporting air, th