micromobility expo 2019, 02 - 04 May
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Reducing pollutants in flue gases

Optimised small-scale combustion reduces dioxin and furan levels

Logo Karlsruher Institut für Technologie


Karlsruher Institut für Technologie

Exhibitor details
Exhibitor details
Logo Reducing pollutants in flue gases

Product description

Rising energy prices and safe energy supply - these are arguments in favour of owning a small-scale combustion system. It creates cosy warmth and provides warm water in many households. As a rule, such small-scale combustion systems are fired with pellets, firewood and coal. However, the airborne particles of pollutants released in the combustion of biogenic or fossil fuels are problematic. Highly toxic substances like carbon monoxide, dust, dioxins and furans escape into the environment, polluting it. Optimised combustion and dust filters already help minimise environmental pollution through carbon monoxide and dust in accordance with the 1st German Federal Immission Protection Ordinance (BImSchV). However, dioxins and furans cannot be removed by a filter unit alone, and they escape into the atmosphere. Nowadays, small-scale combustion systems contribute around 40 per cent of the annually emitted dioxin load in Germany. Scientists at the KIT Institute for Technical Chemistry (ITC) have developed a method specially to remove dioxins and furans that significantly improves flue gas quality. In conventional combustion, the fuel is put into a combustion chamber, where it is burnt, and the gases developing escape via a flue gas pipe. The new method features adding special pellets to the fuel being fed in during an additional process step. These pellets have been enriched with an adsorbing agent, for example active bio-coke, and they enhance a deposit build-up of pollutant particles on them. Before they are burnt, the latter go through a moving bed - a perforated pipe with a screw - in the flue, which causes the flue gases containing pollutants to come into contact with the pellets. The dioxins and furans adsorbed in the fuel subsequently get to the combustion chamber, where the pollutants burn at high temperatures and are safely destroyed. In order to ensure optimal and safe stripping in the moving bed, the flue gases can be cooled ahead of the process.

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Hall 2, Stand B16

(Main stand)

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