BURNER FOR CARRY OUT NITRIC-OXIDES IN INDUSTRIAL BOILER COMBUSTION GASES

摘要

Flow of air/pulverized coal mixture leaving burners (21) that are arranged in the highest horizontal row is directed for reduction of a combustion zone (25) upper limit and increase in distance between this limit and an after-combustion zone (27) and thus elongation of the NOix reduction zone, obliquely downward to the combustion zone (25), in which the air/pulverized coal mixture being supplied by burners (18, 19, 20) of lower horizontal rows is combusted, whereby simultaneously a flow of auxiliary air is supplied from a region of the burners (21) being arranged in the highest horizontal row into combustion chamber (15) for increasing amount of oxygen in the NOix reduction zone and thus nitrogen oxide reduction to molecular nitrogen and conversion of CO to COi2, whereby this flow is directed obliquely upward to the after-combustion zone (27) of combusted mixtures. Behind a the burner ring-shaped channel (2) on the side turned toward the combustion chamber (15) there is arranged a diffuser (28) having conical form and following up with the ring-shaped channel (2). Said diffuser (28) larger base (16) is oriented toward the combustion chamber (15) space, whereby the diffuser (28) cone vertex angle is identical with vertex angle of a conical hole (5) performed co-axially with the diffuser (28) in the wall (7) of an industrial boiler and defines together with the diffuser (28) a ring-shaped opening (4) performed for both supply of secondary air into the combustion chamber (15) around the diffuser (28) lower half and for supply of auxiliary air into the combustion chamber (15) from the room around the diffuser (28) upper half and which is connected via a connecting channel (10) and a control chamber (17) being provided with adjustable blades (11) with an auxiliary air source, whereby in a central channel (1) adjacent to its inner end and in its upper half there is arranged a deflecting baffle (14) oriented obliquely in the direction toward the central channel (1) inner end bottom part for the air/pulverized coal mixture flow.