DE
EN

Dr.-Ing. Stefan Vogt

Do counterflow kilns hold the promise of an energy miracle? (Part 2)

»10 Energy balance of counterflow kiln with forced convection

»11 Sliced setting counterflow kiln by Rieger [12]

»12 Flow geometry in a Helmhold-type counterflow tunnel kiln

The theoretical principles governing the energy consumption of counterflow kilns are explained and compared with the actual performance data of existing counterflow kilns. In addition, the advantages and disadvantages of different types of counterflow kilns are discussed and their energy conservation potentials compared with the energy consumption of fast firing kilns.

6 Counterflow kiln with forced circulation

In the interest of ongoing development for counterflow kilns, the transition to forced circulation with the aid of supplementary circulation fans (»4) would appear to be a logical solution [14, 15]. It would increase the rate of heat transfer and, consequently, reduce the required firing time. Accordingly, it would also reduce the specific insulation losses, the exit losses of the settings, kiln cars and kiln furniture, and the undercar cooling losses. Even conditions of flow approximating those of fast firing can be achieved with the help of...

Robert Thomas Metall- und Elektrowerke GmbH & Co. KG
www.rotho.de

Related articles:

Issue 4/2018 Dr.-Ing. Stefan Vogt

Do counterflow kilns hold the promise of an energy miracle? (Part 1)

1 Introduction According to research by Böger [2], Carl Emmel was awarded German Imperial Patent No. 13604 on May 1, 1880, for his counterflow kiln. The first reference to a foreign patent found by...

more

Issue 6/2017 Dr.-Ing. Stefan Vogt

Benefits and boundary conditions of fast firing clay building products (Part 2)

4 Sizing of fast firing kilns In this installment, an attempt is made to define the dimensions of future, thermally optimized fast firing kilns and their accoutrements according to present...

more

Issue 09/2009

The role of the combined heat system in the brick plant

1 Introduction The combined heat system between the kiln and dryer was already used in individual cases at the beginning of the 20th century in large-volume dryers arranged above the annular kiln...

more

Issue 5/2011

Practical experience with longitudinal and transversal recirculation systems in a tunnel kiln

1 Introduction The reduction of the specific energy requirement in the brick production process is, under the current economic constraints, of paramount importance. Various scenarios [1] indicate that...

more

Issue 1-2/2011 In memory of Dr.-Ing. Karsten Junge gewidmet Dr.-Ing. Karsten Junge

The solid-solid recuperator – a forced-convection tunnel kiln for higher energy efficiency

1 Introduction In principle, the manufacture of ceramic products requires no energy, because sintering is an energetically neutral process. For endothermic reactions, however, such as limestone...

more