Using this dosing solution, THT can be dosed very accurately, within a range of 1-2%. This is a major improvement compared with the traditional batch-wise method. Furthermore, the continuous dosing results in a homogeneous THT/biogas mixture, which is a more efficient way of dealing with the amount of odorant as overdosing is avoided.
Another important aspect is the operational reliability of this solution - the ability to supply the natural gas odorant to the natural gas mains. Prior to entering the mains, the biogas composition is analysed by GC. If the biogas contains not enough THT, the grid operator will shut off the supplier from the natural gas mains. By default, the monitoring of the dosing occurs by PLC, but it can also be done by means of the flow controller itself. In this solution, it is exactly known how much THT has been dosed - and an alarm will be given when no odorant is detected. Moreover, a prediction can be made when an empty THT storage tank has to be replaced.