Concepts for reducing exhaust air loss from dryers in the brick and tile industry

The article presents different possibilities for lowering the energy requirement during drying and thus for lowering the loss of exhaust air from drying plants. A description is given of how, with existing drying technology, a reduction of the energy requirement can be achieved. This concerns the widely used chamber dryers, but also continuous dryers. Since the dryer exhaust air is the greatest energy consumer in the brick plant, the article also deals with possibilities for heat recovery from the dryer exhaust air.

1 Dryer exhaust air as the greatest energy consumer

in brick manufacturing

More than half of the energy required altogether for brick manufacturing is used for drying the green products. This is generated only to a smaller extent by direct heating of the supply air to the dryer. For the most part it consists of the enthalpy of the cooling air heated by the cooling down of the bricks in the tunnel kiln. But even this larger portion coming from the tunnel kiln is by no means to be regarded as cost-neutral, because the warm air generated by the fired hot bricks must of course be provided by the...

Related articles:

Issue 2012-11

Waste heat utilization and integrated energy supply in brick and tile factories

When, as a result of increasing energy prices, the costs incurred for the energy-intensive process steps of drying and firing rise, measures for energy saving and the economically efficient use of...

Issue 2015-8

Use of heat pumps in brick drying

For a brickworks with a production rate of 400 tonnes per day fired ware, the mixing water content of around 20 mass% necessary for pressing means that every day around 80 t water must be expelled...

Issue 2017-6

Optimizing the energy efficiency of a tunnel kiln by decoupling the kiln/dryer heat cycle

Decoupling the kiln/dryer heat cycle by means of an upstream or downstream kiln tunnel is an inexpensive way to optimize the energy efficiency of a clay products plant. This not only improves its...

Issue 2015-8 Prof. Dr.-Ing. Christian Schäffer

Combined kiln-dryer heating systems with thermochemical heat storage

1 Introduction In Zi Brick and Tile Industry International 7/2015, the concept of a brickworks with a “hybrid-ring tunnel kiln” was presented, in which the kiln cooling/dryer combined heating system...

Issue 2010-02

Concepts for reducing the loss of exhaust air from dryers in the clay brick and tile industry

1 Initial situation and problem description More than half of the energy used in the production of clay bricks and tiles is currently used for drying green bricks and tiles. The hot air needed for...