Heat recovery with flue gas heat exchangers on ceramic kilns

The cost of energy is on the rise, so it is becoming increasingly important to prevent energy losses and practice sustainability. Numerous ceramic kilns still have such high levels of flue gas heat losses, that it would be a thoroughly worthwhile investment to fit them out with heat exchangers. This contribution presents several completed projects as examples.

1 General

Hot flue gases from ceramic kilns can rarely be directly exploited as heat sources for other parts of plant, because they are always more or less heavily contaminated with undesirable constituents from the raw materials and/or fuel. While some brickmakers actually do make direct use of flue gases in their drying facilities, the acidic content of the gas is not very good for either the dryers or the drying supports and stillage. Consequently, heat exchangers are needed to extract the – often quite substantial – thermal energy from the flue gases.

Heat exchangers can operate on air,...

Related articles:

Issue 06/2013

Utilization of Waste Heat and Combined Energy Systems in Brick Plants

1 Introduction Owing to the combination of the heat systems of dryer and kiln, the dryer often remains undetected as the major consumer of energy in a brick plant. For the most part, the installation...

Issue 1/2019 HeatMatrix Group BV

Heat recovery from flue gases by means of polymer-based heat exchangers

HeatMatrix Group has developed a novel acid- and fouling-resistant system based on polymer technology to effectively recover heat from flue gas in the ceramics industry. The challenge The production...

Issue 7/2015 Prof. Dr.-Ing. Christian Schäffer

Hybrid-ring tunnel kiln with flue-gas-based combined heating system: 65% savings on energy – a concept study

1 Introduction The concept begins by dissolving the kiln/dryer combined heating system, instead supplying the dryer with energy via exergetically optimized heat flow from the kiln exhaust and power...

Issue 03/2021

Solutions for clean air

Since 1963, Hellmich GmbH & Co. KG has been producing systems for flue gas purification and dedusting technology as well as components for the associated piping and apparatus engineering. Dust and...

Issue 03/2023

Climate-neutral firing process in the brick and tile industry – possible for us?

We say “yes”, it can be done. We clearly realise that this is a very big challenge for everyone involved. Together we need a lot of commitment and courage to achieve this goal. Introduction As we...