(19)
(11) EP 0 238 907 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.11.1988 Bulletin 1988/45

(43) Date of publication A2:
30.09.1987 Bulletin 1987/40

(21) Application number: 87103150

(22) Date of filing: 05.03.1987
(84) Designated Contracting States:
BE DE ES FR GB IT NL SE

(30) Priority: 24.03.1986 US 843419

(71) Applicant: COMBUSTION ENGINEERING, INC.
 ()

(72) Inventors:
  • Bianca, Joseph David
     ()
  • Anderson, David Kenneth
     ()

   


(54) Low excess air tangential firing system


(57) A furnace (10) in which pulverized coal is burned in suspension. The coal is introduced along with primary air, tangent to an imaginary circle (42). The auxiliary air is introduced tangent to an imaginary circle (44) directly above the primary air, in a direction of rotation opposite that of the primary air. The auxiliary air is directed tangent to a circle of greater diameter than that of the primary air. There are a plurality of alternating levels within the furnace where primary air (38), and then auxiliary air (40), is introduced.







Search report