Exit air purifying methods of and - a system for the elimination in particular of formaldehyde from a correspondingly loaded exhaust gas flow of a biogas - combustion device

摘要

For the elimination of the exit air purifying methods in particular of formaldehyde (ch₂O) from a correspondingly loaded exhaust gas flow (a) a biogas - a combustion device (10), in which the exhaust gas flow (a)– from the biogas - a combustion device (10), directly into a chamber (21) of a convection drying plant (20) is initiated and– as a process air (p) by the convection drying plant (20), and transmitted– at the end as a dryer exhaust air (t) is drawn off; wherein the dryer exhaust air (t)– at least over a first, which is constructed as a wet scrubber gas purification unit (40) is guided, in which at least in the dryer exhaust air (t) during the drying process resulting ammonia (nh₃) is washed out, as well as– at least over a second, likewise designed as a wet scrubber gas purification unit (50) is guided, in which in the dryer exhaust air (t) containing at least from the exhaust gas (a) coming from formaldehyde (ch₂O) is washed out.