We are regularly asked what the actual gas mixer element, i.e. the mixer, looks like. Here is a picture of the gas mixer element, which is inserted into the pipeline and mixes the gases. Why do we do this now?
DVGW 213(A) “Plants for the production of fuel gas mixtures” gives explanation: “The mixer is intended to bring together gas flows in a pipeline in such a way that a homogeneous gas mixture is produced after the shortest possible pipe distance. The selection of the mixer is based on the load range (constant load, variable load with narrow or wide limits), the pressure of the gases to be mixed, the required mixing gas pressure and the mixing ratio (constant or variable). (…) If the consumer of the mixed gas is located relatively far away from the mixing point, it may also be sufficient if the gases to be mixed are brought together in the pipeline without a mixing device. It shall be ensured that sufficient mixing is achieved.”; This describes why we use these rather expensive mixers. The sampling from the gas stream to determine the mixing quality (e.g. proportioning gas content, calorific value, oxygen content, etc.) usually takes place very shortly after the gases are combined, which is why we use a sophisticated mixer. An improvement in mixing quality by reducing the diameter is limited by the resulting increase in pressure loss.
Our static mixer alternately divides the material flow with flow-influencing elements and then brings it back together. This allows us to create a homogeneous gas mixture that we can analyze without streaks influencing the measurement result. These gas mixer elements are specially designed, fluid mechanically calculated with CFD simulations and manufactured to measure. Of course, this is correspondingly expensive, but in this way we ensure careful mixing with a low pressure loss and in a short distance.
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