THICK-THIN COAL DUST SEPARATION AND ARRANGEMENT STRUCTURE FOR SINGLE-FIREBALL EIGHT-CORNER STRAIGHT-FLOW BURNER

摘要

A dense/dilute pulverized coal separator structure (4) of a single-fireball octagonal direct-flow burner, of which a boiler body (1) is provided with eight burner groups, each water cooled wall (9) is provided with two burner groups respectively, each of the burner groups comprises multiple nozzles toward the same burner (10), and center lines of all nozzles on the eight burner groups form an imaginary tangent circle (11) in a furnace along the same tangential direction. In the dense/dilute pulverized coal separator structure (4), eight burner groups are arranged on four water cooled walls (9) of the boiler (1), thus increasing pulverized coal concentration of a pulverized rich coal area, allowing wall heat load qHr of a lower burner area to be higher, allowing burning temperature of the area to meet requirements for anthracite burning stability, shortening distance of jet flow from a nozzle outlet to downstream adjacent air flow, being capable of using lower primary pulverized coal air flow velocity, enhancing heat flow intensity at the nozzle outlet, improving convection and radiation heat transfer capacity, and ensuring timely ignition of pulverized anthracite air flow and stable burning of the boiler at low load without oil.