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 3/2016 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 11/2014 OTTO-VON-GUERICKE UNIVERSITY MAGDEBURG/GERMANY

Energy consumption and CO2 content in the flue gas of normal shaft kilns | Part 1: Influence of the air excess number

1 Introduction The so-called multi-fuel-fired normal shaft kiln (NSK) is one of the oldest types of lime shaft kiln, in which burnt lime is produced from limestone by expelling the carbon dioxide...

more
Issue 12/2011

Simulation of lime calcination in PFR kiln – Influence of energy input and lime throughput

This article presents a one-dimensional mathematical model to describe and simulate the lime calcination process in a parallel flow regenerative (PFR) lime shaft kiln. The model comprises ordinary...

more
Issue 04/2012

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
Issue 12/2014 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