TH25546B - Methods and equipment for the production of cement clinker - Google Patents

Abstract

The DC60 detailed description shall describe the method and equipment for the production of clinker cement by which the cement raw material is preheated in a preheater (1), fired in a kiln (3) assembled with upper end (3a) and lower end (3b), fired into clinker cement in a kiln (5), and then cooled in a clinker cooler (7). The fabrication shall be characterized in which the exhaust gas from kiln (5) is introduced into the upper end (3a) of the kiln, in which similarly the fuel is introduced into the upper end (3a) of the kiln, in which the exhaust gas/fuel suspension is introduced down through the kiln (3), in which the air preheated from the clinker cooler (7) and the raw material preheated from the preheater (1) in the assembly or fed. It is separated and fed into the combustion chamber (3) located below the area where the furnace exhaust gases and fuel are introduced. The preheated air is fed down through the combustion chamber (3), gradually mixed with the exhaust gas/fuel suspension, where the feedstock, under the action of gravity, is fed down through the combustion chamber (3) along the walls of the combustion chamber, suspended in exhaust gas at the lower end (3b) of the combustion chamber, and where the exhaust gas/feedstock suspension is removed from the lower end (3b) of the combustion chamber and conveyed to the separation pathway (4) for the separation of the feedstock, which is then conveyed to the furnace (5). This method results in a significant reduction of NO x which is conveyed to the combustion chamber along with the furnace exhaust gases, a high level of fuel combustion even when using fuels with low volatile components, and a low level of nitrogen conversion to NO x which is conveyed to the combustion chamber along with the fuel. A detailed description of the method, including the equipment for production, will be provided. Cement clinker, by means of preheated cement raw materials in a preheater (1), is fired in a kiln (3) which is assembled with upper end (3a) and lower end (3b), is fired into clinker in a kiln (5), and is subsequently cooled in a clinker cooler (7). The invention is characterized in such that the exhaust gas from kiln (5) is introduced into the upper end (3a) of the kiln, in such similarity the fuel is introduced into the upper end (3a) of the kiln, in such a suspension of exhaust gas/fuel is introduced down through the kiln (3), in such a preheated air from the clinker cooler (7) and preheated raw materials from the preheater (1), either together or separately, are fed into the kiln (3) at a location below where the kiln exhaust gas and fuel are introduced, in such a location where the preheated air is introduced down through the kiln (3) which is gradually mixed with the exhaust gas/fuel suspension, where the raw materials under the action of force Gravity is carried down through the combustion chamber (3) along the walls of the combustion chamber, where it is suspended in flue gas at the lower end (3b) of the combustion chamber, and where the flue gas/feed suspension is removed from the lower end (3b) of the combustion chamber and conveyed to the separation pathway (4) for the separation of the feed gas which is then conveyed to the furnace (5). This results in a significant reduction of NO x which is conveyed to the combustion chamber along with the furnace flue gas. High fuel combustion levels are achieved even when using fuels with low volatile content and low nitrogen conversion to NO x which is conveyed to the combustion chamber along with the fuel.

Claims (13)

1. Method for the production of cement clinker by which the cement raw material is preheated in a preheater (1), combusted in a kiln (3) which consists of an upper end (3a) and a lower end (3b), is burned into clinker in a kiln (5), and subsequently cooled in a clinker cooler (7). It is characterized by the exhaust gas from kiln (5) being introduced into the upper end (3a) of the kiln, where similarly the fuel is introduced into the upper end (3a) of the kiln, where the exhaust gas/fuel suspension is passed down through the kiln (3), where air preheated by the clinker cooler (7) and the preheated raw material from the preheater (1), either together or separately, are fed into the kiln (3) located under the area where the exhaust gas from the kiln and fuel are introduced, where the preheated air is passed down. The feedstock (3) is gradually mixed with the flue gas/fuel suspension, where the feedstock, under the action of gravity, is carried down through the burner (3) along the wall of the burner, suspended in flue gas at the lower end (3b) of the burner, and where the flue gas/feedstock suspension is removed from the lower end (3b) of the burner and conveyed to the separation pathway (4) for the separation of the feedstock, which is subsequently transported to the furnace (5). 2. The method under claim 1 is characterized by the flue gas of the furnace being introduced into the upper end of the furnace (3a) radially, tangentially or axially. 3. The method under claim 2 is characterized by the fuel being introduced into the upper end (3a) of the burner together with the burner exhaust gases. 4. The method under claim 1 is characterized by the fuel being brought in separately into the upper end (3a) of the burner. 5. The method under claim 4 is characterized by the fuel being injected axially from the top of the burner (3). 6. The method under claim 1 is characterized by the suspension of the mixture of flue gases and fuel being passed down through the burner (3) which produces a flame in the central area of the burner. 7. The method under claim 1 is characterized by the preheated air from the cement cooler (7) and the preheated raw material from the preheater (1) being introduced into the kiln as a combined air/raw material suspension. 8. The method described in claim 7 is characterized by the air/fuel suspension being introduced circumferentially so that the fuel is flung against the walls of the combustion chamber, causing it to slide down the walls under the action of gravity, while the air forms a barrier around the flame so that the air is gradually mixed with the exhaust gas/fuel suspension. 9. The method under claim 1 is characterized by the preheated raw material being fed into the furnace (3) at a number of locations at the end of the unit. 10. The method under claim 9 is characterized by the preheated raw material from the preheater (1) being fed into the lower end (3b) of the burner and/or into the conveyor (3c). 11. The method under claim 1 is characterized by the preheated raw material from the preheater (1) being fed into the furnace together with the furnace exhaust gases. 12. The method under claim 11 is characterized by the preheated raw materials which are to be introduced in this manner being immediately introduced into the furnace exhaust gas stream after the exhaust of these gases from the furnace (5). 13. The device for achieving the invention of the furnace shall consist of a preheater (1), a kiln (3) consisting of upper (3a) and lower (3b) ends, a kiln (5), and a subsequent clinker cooler (7), and shall be characterized by the following pathways: (15) for the intake of the kiln exhaust gases into the upper end (3a) of the kiln; (13) for the intake of fuel into the upper end (3a) of the kiln; (11) for the intake of preheated air from the clinker cooler (7) into the kiln (3) located below the kiln exhaust gas and fuel intake area; (17) for the intake of preheated raw material into the kiln (3) located below the kiln exhaust gas and fuel intake area; and (6) for the removal of exhaust gas/raw material suspensions from the lower end (3b) of the kiln and for conveying the suspensions. To the separation pathway (4) and pathway (8) for transporting the separated raw materials to the furnace (5).