Method for preheating cement raw meal, and device for carrying out said method
In a method for the preheating of cement raw meal for the production of cement-clinker, in which the cement raw meal is conveyed towards the feed side of a cement clinker kiln ( 1 ) in at least one heat exchanger-line in counter flow to hot gases, the hot gases are drawn off via at least a first heat exchanger ( 2 ) connected with the feed end of the cement clinker kiln ( 1 ) and via heat exchanger-lines ( 3,4 ) following this first heat exchanger ( 2 ) and being parallel to each other. The device for carrying out said method is characterized in that heat exchanger-lines ( 3,4 ) arranged in parallel to each other are connected to at least a first heat exchanger ( 2 ) joined to the feed end of the cement clinker kiln.
1. Method for preheating of cement raw meal for production of cement clinker, comprising the step of
conveying cement raw meal towards a feed end of a cement clinker kiln ( 1 ) through four separate heat exchanger-lines in counter flow to hot gases, each of said heat exchanger-lines comprising second cyclone/fluidized bed-heat exchangers ( 5 ) connected in series,
wherein the hot gases are drawn off
via two first heat exchangers ( 2 ) connected to the feed end of the cement clinker kiln ( 1 ), and
via two of the heat exchanger-lines ( 3 , 4 ) following each of the two first heat exchangers ( 2 ) in a direction of flow of the hot gases, so that the four separate heat exchanger-lines ( 3 , 4 ) are arranged in parallel with each other, and
wherein the two first heat exchangers ( 2 ) have a greater volume as compared to volumes of said second heat exchangers ( 5 ).
2. Device for preheating of cement raw meal for production of cement clinker, comprising
at least two first heat exchangers ( 2 ) connected to a feed end of a cement clinker kiln ( 1 ), and
four separate heat exchanger-lines ( 3 , 4 ), each of said heat exchanger-lines comprising second cyclone/fluidized bed-heat exchangers ( 5 ) connected in series, for feeding cement raw meal in counter current to hot gases drawn off through the heat exchanger-line ( 3 , 4 ), wherein
two of the heat exchanger-lines ( 3 , 4 ) are connected to and follow each of the first two heat exchangers ( 2 ) in a direction of flow of the hot gases,
said two of the heat exchanger-lines ( 3 , 4 ) connected to and following each of the first two heat exchangers ( 2 ) are arranged in parallel with each other, so that said four separate heat exchanger-lines ( 3 , 4 ) are arranged in parallel with each other, and
the two first heat exchangers ( 2 ) have a greater volume as compared to volumes of said second heat exchangers ( 5 ).
3. Device according to claim 2 , wherein the two first heat exchangers ( 2 )
are cyclone/fluidized bed-heat exchangers, and
are connected to a feeding chute for one or more of a precalciner and the clinker kiln ( 1 ).
4. Device according to claim 3 , wherein the two first heat exchangers ( 2 )
are connected to the feeding chute of the clinker kiln ( 1 ), and
have a greater diameter as compared to diameters of the second heat exchangers ( 5 ) following a branching in the direction of flow of the hot gases.