OTTO VON GUERICKE UNIVERSITY MAGDEBURG

Simulation of limestone calcination in ­normal shaft kilns – Part 2: Influence of process parameters

For normal shaft kilns it is described how the axial profiles of the surface and core temperature of the stones, their decomposition and the gas temperature depend on the process parameters, which are stone size, energy input, throughput and type of fuel. In addition, the influence of these variables on the specific energy consumption, the residual CO2 content and the pressure drop is discussed.

1 Introduction

The calcination of limestone in normal shaft kilns is a complex process, since it is influenced by a variety of parameters. These influencing factors are:

the operating variables such as energy input, throughput, type of fuel, air flow,

the kiln parameters such as diameter, packed bed height, cooling zone length,

the limestone parameters such as mean particle size and material properties (thermal conductivity, coefficient of decomposition, decomposition pressure, calcite fraction, magnesite fraction, humidity, etc.)

ambient conditions (ambient temperature, air velocity, clouds).

The...

Related articles:

Issue 2016-3 OTTO VON GUERICKE UNIVERSITY MAGDEBURG

Simulation of limestone calcination in normal­ shaft kilns – Part 3: Influence of particle size ­distribution and type of limestone

1 Introduction In the first part of this series, a mathematical model describing the simulation of burning limestone was presented [1]. In the second part examples were presented showing how the...

more
Issue 2014-12 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 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...

more
Issue 2010-06

Thermophysical properties of limestone as a function of origin (Part 2): Calcination enthalpy and equilibrium temperature

1 Introduction For the energy evaluation of the calcination process in kilns two enthalpy values are required: the enthalpy at normal temperature and the enthalpy at decomposition temperature. The...

more
MAERZ OFENBAU AG

A single shaft Maerz HPS kiln for Schaefer Kalk Malaysia

Schaefer Kalk GmbH & Co. KG, the renowned German lime manufacturer, has been operating a major lime plant in Kuala Ketil, a small town in North Malaysia’s Kedah province since 1997. As is typical for...

more
Issue 2012-04

Simulation of lime calcination in PFR kilns – Influence of source and size of limestone

The previous article presented a one-­dimensional mathematical model to describe and simulate the lime calcination process in a PFR lime shaft kiln [1]. The model was used to calculate the...

more