Dry sorption for flue gas purification with waste incineration in mobile models for German Armed Forces encampments

Posing the tasks

With the international deployment of the German Armed Forces, encampment waste similar to domestic waste and, in field hospitals, smaller quantities of clinical waste accrue. These must be incinerated for environmental protection according to Germany's valid on-site regulations and the resulting emissions must be cleaned to the limit values according to the 17th BImSchV.

For the highest degree of mobility, the system must be built into a standardised container with climate demands appropriate to worldwide deployment. The frequent change-out of personnel requires simple operation with low maintenance time and effort.

Solution / Highlights

Waste incineration takes place in a chamber oven with discontinuous waste deposition in the main combustion chamber. The required emission combustion temperature and dwell time are ensured via the post-combustion chamber.

The uncomplicated and robust, yet highly effective dry sorption process is deployed for emission gas purification. The addition of sodium bicarbonate affects the absorption of acidic contaminants and, from activated coal, the adsorption of mercury and dioxins.

Following cooling of the emissions to the reaction temperature via a gas/air heat exchanger, the additives are added to the pipe reactor and carried with the emission gas. Reactions with the contaminants take place already in this in stream flow.

In the downstream filter, additives, reaction products and dusts build a beneficial filter cake layer on the filter element, in which the contaminants ultimately react and are bonded. Filter elements are constructed of ceramic fibre material, making possible safe operations without lasting damage, even with potential temperature spikes.

The filter housing and dust discharge via worm conveyor require special constructions with very low structural height in order to make possible an installation in the container. Large doors ensure access to all components.

Two systems are already in continuous deployment.