Abstract A calcination apparatus having a cylindrical calcining furnace which is composed of (a) a throat part, (b) a spouted bed where a calcination reaction is mainly effected with a flue gas straightforwardly rising upwards and/or heat of burners, and (c) an uppermost chamber where admixture, dispersion and heat exchange are effected with a tangential flow of an exhaust flue gas introduced from a rotary kiln or from a fluidized bed calcining device, these (a)(b)(c) being longitudinally connected in series with an upper part of a combustion chamber having a separate heat source, and which is disposed between the said rotary kiln or fluidized bed calcining device and a suspension type raw material preheating device, the said combustion chamber being provided with a burner and an inlet line for feeding a preheated air under pressure, a duct line for introducing the exhaust flue gas from the rotary kiln, etc. being opened to the wall of the calcining furnace tangentially in the vicinity of the upper end part of the said spouted bed and almost perpendicular to the central axis line of the said furnace, powders of the raw materials which have been preheated in the said preheating device and have been partly decomposed being introduced in the vicinity of the lower part of the said uppermost chamber via a raw material inlet duct, and a line for transporting a mixture of the exhaust flue gas from the said combustion chamber, the said rotary kiln, etc., and the powders of completely calcined raw materials to a lowermost cyclone being connected to the wall of the said calcining furnace tangentially in the vicinity of the top of the said uppermost chamber and almost perpendicular to the central axis line of the said furnace.
An apparatus for calcination of cement clinkers comprising a substantially cylindrical vertically disposed calcining furnace having in series from bottom to top a combustion chamber portion providing with burner means, a reduced diameter throat portion, a spouted bed portion provided with additional burner means and an uppermost heat exchange chamber portion; a suspension type raw material preheating means having inlet means for receiving raw material and outlet duct means extending into said furnace for supplying preheated material to the upper portion of said spouted bed portion; a rotary kiln means having burner means at one end and exhaust gas outlet means at the opposite end thereof, duct means connecting the exhaust gas outlet means to the upper portion of said spouted bed portion of said furnace, said duct means extending into said cylindrical furnace substantially tangentially thereto, outlet duct means disposed substantially tangentially with respect to said cylindrical furnace at the top of said uppermost heat exchange chamber for removing heated gases and calcined material from said furnace, cyclone separator means having an inlet connected to said outlet duct means, a first outlet connected to said suspension type preheating means for supplying hot gases thereto and a second outlet connected to said rotary kiln for supplying calcined material thereto.
Claim 2
Independent Claim
209 words
An apparatus for calcination of cement clinkers comprising a substantially cylindrical vertically disposed calcining furnace having in series from bottom to top a combustion chamber portion providing with burner means, a reduced diameter throat portion, a spouted bed portion provided with additional burner means and an uppermost heat exchange chamber portion; a suspension type raw material preheating means having inlet means for receiving raw material and outlet duct means extending into said furnace for supplying preheated material to the upper portion of said spouted bed portion; a rotary kiln means having burner means at one end and exhaust gas outlet means at the opposite end thereof, duct means connecting the exhaust gas outlet means to the upper portion of said spouted bed portion of said furnace, said duct means extending into said cylindrical furnace substantially tangentially thereto, outlet duct means disposed substantially tangentially with respect to said cylindrical furnace at the top of said uppermost heat exchange chamber for removing heated gases and calcined material from said furnace, cyclone separator means having an inlet connected to said outlet duct means, a first outlet connected to said suspension type preheating means for supplying hot gases thereto and a second outlet connected to said rotary kiln for supplying calcined material thereto.
Claim 3
Dependent Claim
79 words
An apparatus as set forth in claim 1 wherein said kiln is provided with an outlet for said cement clinkers and further comprising cooling bed means connected to the cliker outlet of said kiln for receiving said clinkers, a pipe connected at one end to said cooling bed means and at the opposite end to said burner means for said combustion chamber portion of said furnace for supplying preheated air from said cooling bed means to said burner means.
Claim 4
Dependent Claim
34 words
An apparatus as set forth in claim 1 wherein said suspension type preheating means is comprised of a plurality of cyclone separators connected in series between said inlet means and said outlet duct means.