For the extractive analysis of process and emission gases the reliable and constant reduction of the sample gas moisture is indispensable. The solution for moisture reduction by cooling leads to the problem of loss of concentration of the water-soluble sample gas component (e. g. SO2). This effect is also called the leaching effect.
In order to minimise this leaching effect, Bühler Technologies developed the stationary acid dosing unit. A premixed acid is metered into the heat exchanger at a constant flow rate to saturate the precipitated water content. A plate holder allows the complete unit to be mounted on the wall. The modified cover facilitates the connection to the acid tank. The specifically designed connection adapters on the metering pump and the heat exchangers ensure a short lead time of the acid feed in the metering line. A capacitive sensor for level monitoring of the acid is also available.
Bühler Technologies, Ratingen, Germany
