Cement-manufacturing plant and process for producing cement clinker

Abstract

A cement production plant may include a preheater for preheating raw meal, a calciner for calcining the preheated raw meal, and a furnace with a furnace burner for firing the raw meal to form cement clinker. The furnace has a combustion gas inlet for admitting a combustion gas with an oxygen content of 30% to 75% into the furnace. The cement production plant may also include a cooler for cooling the cement clinker. The calciner and the furnace each have at least one respective fuel inlet for admitting at least one fuel into the calciner and the furnace. The calciner and the furnace each have at least one respective inert gas inlet for respectively admitting inert gas into the calciner and the furnace.

1 .- 16 . (canceled) 
     
     
         17 . A cement production plant comprising:
 a preheater configured to preheat raw meal;   a calciner configured to calcine the raw meal that has been preheated;   a furnace with a furnace burner configured to fire the raw meal to form cement clinker, wherein the furnace has a combustion gas inlet configured to admit a combustion gas with an oxygen content of 30% to 100% into the furnace; and   a cooler configured to cool the cement clinker;   wherein the calciner and the furnace have a respective fuel inlet configured to admit fuel into the calciner and the furnace, wherein the calciner and the furnace have a respective inert gas inlet for respectively admitting inert gas into the calciner and the furnace.   
     
     
         18 . The cement production plant of  claim 17  wherein the fuel inlet and the inert gas inlet are arranged separately from one another and each forms an inlet. 
     
     
         19 . The cement production plant of  claim 17  wherein the fuel inlet and the inert gas inlet together form an inlet. 
     
     
         20 . The cement production plant of  claim 17  wherein at least one of the calciner or the furnace has multiple inert gas inlets. 
     
     
         21 . The cement production plant of  claim 17  wherein the calciner has a raw meal inlet configured to admit raw meal into the calciner, wherein the raw meal inlet is arranged upstream of the fuel inlet and the inert gas inlet in a direction of flow of gas within the calciner. 
     
     
         22 . The cement production plant of  claim 17  wherein the calciner has a raw meal inlet configured to admit raw meal into the calciner, wherein the raw meal inlet is arranged downstream of the fuel inlet and the inert gas inlet in a direction of flow of gas within the calciner. 
     
     
         23 . The cement production plant of  claim 17  wherein the calciner has at least two raw meal inlets configured to admit raw meal into the calciner, wherein at least one of the at least two raw meal inlets is arranged upstream of the fuel inlet in a direction of flow of gas within the calciner. 
     
     
         24 . The cement production plant of  claim 17  comprising a control device that is connected to a temperature measuring device within the calciner and that is configured to regulate a quantity of at least one of raw meal, inert gas, or fuel in the calciner based on a temperature ascertained by the temperature measuring device. 
     
     
         25 . The cement production plant of  claim 17  wherein at least one cross-sectional constriction of a calciner cross section is configured within the calciner. 
     
     
         26 . The cement production plant of  claim 17  comprising a guide element for guiding at least one of gas flow or fuel within the calciner. 
     
     
         27 . The cement production plant of  claim 27  comprising multiple of the guide element, wherein the calciner includes fuel charging apparatuses that each comprises a fuel inlet and an inert gas inlet, wherein one of the guide elements is assigned to each fuel charging apparatus. 
     
     
         28 . The cement production plant of  claim 17  comprising a combustion chamber disposed between the furnace and the calciner, the combustion chamber having a raw material inlet, a fuel inlet, and an inert gas inlet. 
     
     
         29 . A method for producing cement clinker, the method comprising:
 preheating raw meal in a preheater;   calcining in a calciner the raw meal that has been preheated;   firing in a furnace with a furnace burner the raw meal that has been preheated and calcined to form cement clinker, wherein a combustion gas with an oxygen content of 30% to 100% is supplied to the furnace; and   cooling the cement clinker in a cooler; and   supplying a fuel and an inert gas to the furnace and to the calciner.   
     
     
         30 . The method of  claim 29  comprising supplying the inert gas to the calciner and/or to the furnace together with the fuel. 
     
     
         31 . The method of  claim 29  comprising supplying the inert gas to the calciner and/or to the furnace separately from the fuel. 
     
     
         32 . The method of  claim 29  comprising admitting the raw meal into the calciner in a direction of flow of gas within the calciner prior to the fuel and the inert gas. 
     
     
         33 . The method of  claim 29  comprising:
 ascertaining a temperature within the calciner; and 
 regulating a quantity of at least one of raw meal, inert gas, or fuel that is supplied to the calciner based on the temperature. 
 
     
     
         34 . The method of  claim 29  wherein a flow-calmed region is configured within the calciner by way of a guide element or a cross-sectional constriction of a cross section of the calciner.