DrySoTec GmbH products

Scrubbers are used in wet flue gas cleaning for cleaning the flue gas. In the scrubbing zone, the pollutants contained in the flue gas are separated through an intensive contact with the scrubbing water by means of physical or chemical absorption. In the first stage of wet scrubbing, primarily HCl, HF, mercury compounds, dust, heavy metals bound in particles and gaseous heavy metals are absorbed in the acid scrubbing water. In the second stage, primarily SO2 is absorbed in a suspension of lime hydrate or sodium hydroxide solution (NaOH).

For the quasi-dry flue gas cleaning, suspensions or solutions are distributed in the flue gas flow by means of a spray absorber with rotary distributor or two-component nozzles. The acid flue gas components are absorbed in alkaline droplets with simultaneous water vaporization. For the separation of organic pollutants and heavy metals, an adsorbent (e.g. coke dust) can be added upstream, in or downstream of the spray absorber. The reaction products are separated in a downstream dust filter (fabric or electric filter).

In the process of dry flue gas cleaning, the flue gas, if necessary, is moistened and cooled upstream of the actual reaction stage. This is done, on the one hand, for protecting the filter (temperature) and, on the other hand (if lime is used), for moistening the flue gas up to the dew point range. In order to bind the pollutants contained in the flue gas flow, such as hydrochloric acid (HCl), sulphur dioxide (SO2), organic pollutants (e.g., PCDD/-DF, PCB) as well as ecotoxic heavy metals (e.g., mercury), in the downstream reaction line sorbents, such as NaHCO3 or lime hydrates and hearth furnace cokes are a metered addition. The reaction products are efficiently separated by means of a downstream filter and recirculated, if necessary.