OTTO-VON-GUERICKE-UNIVERSITÄT MAGDEBURG/GERMANY

Energy consumption and CO2 content in the flue gas of normal shaft kilns:
Part 2: Influence of the limestone quality and the process parameters

1 Energy consumption for different residual CO2 contents of the limestone as a ­function of the CO concentration xˆco in the flue gas
1 Energy consumption for different residual CO2 contents of the limestone as a ­function of the CO concentration xˆco in the flue gas
2 CO2 concentration in the flue gas for different residual CO2 contents of the limestone as a function of the CO concentration in the flue gas
2 CO2 concentration in the flue gas for different residual CO2 contents of the limestone as a function of the CO concentration in the flue gas
3 Energy consumption for different residual CO2 contents of the limestone as a ­function of the heat loss through the kiln wall
3 Energy consumption for different residual CO2 contents of the limestone as a ­function of the heat loss through the kiln wall
4 CO2 concentration in the flue gas for different residual CO2 contents of the limestone as a function of the heat losses through the kiln wall
4 CO2 concentration in the flue gas for different residual CO2 contents of the limestone as a function of the heat losses through the kiln wall
5 Energy consumption for different residual CO2 contents of the ­limestone as a function of the CO2 content of the limestone
5 Energy consumption for different residual CO2 contents of the ­limestone as a function of the CO2 content of the limestone
6 CO2 concentration in the flue gas for different residual CO2 contents of the limestone as a function of the CO2 content of the limestone
6 CO2 concentration in the flue gas for different residual CO2 contents of the limestone as a function of the CO2 content of the limestone
7 Energy consumption for different residual CO2 contents of the ­limestone as a function of the MgCO3 content of the limestone
7 Energy consumption for different residual CO2 contents of the ­limestone as a function of the MgCO3 content of the limestone
8 CO2 concentration in the flue gas for different residual CO2 contents of the limestone as a function of the MgCO3 content of the limestone
8 CO2 concentration in the flue gas for different residual CO2 contents of the limestone as a function of the MgCO3 content of the limestone
9 Flue gas temperature for different air excess numbers as a function of the moisture water content of the feed material
9 Flue gas temperature for different air excess numbers as a function of the moisture water content of the feed material
The influence of limestone quality and process parameters on normal shaft kiln processes credits: OvG Universität, Magdeburg
The influence of limestone quality and process parameters on normal shaft kiln processes
credits: OvG Universität, Magdeburg

This Part 2 of the article describes the influence of limestone quality and the process parameters, CO content, kiln wall heat losses and moisture content of the solid feed materials. The influence of the air excess number and the balance equations were already explained in the preceding part of the article.

1 Influence of the CO concentration in the flue gas

The lime shaft kiln is used in the lime industry in order to produce so-called medium to hard-burnt lime. This type of kiln is also used in the sugar and soda industries because they need as a second product a flue gas with a high CO2 content. In the soda and lime industries it is sometimes necessary to use limestones with a high content of inert matter and magnesites.

Fig. 1 shows the effect that CO concentrations in the flue gas have on the energy consumption per kg of product (MJ/kgoutput) and per kg of calcium oxide (CaO) (MJ/kgCaO) for...

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ZKG 12/2014

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ZKG 12/2014

Ressort:  Process
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TEXT M.Sc. Bassem Hallak1, Prof. Dr.-Ing. Fabian Herz1, Prof. Dr.-Ing. Eckehard Specht1, Dr.-Ing. Georg Kehse2
1 Otto von Guericke University Magdeburg, Magdeburg/Germany
2 Ingenieurbüro für Wärme- und Prozesstechnik GmbH, Neuss/Germany

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