Methane is odorous
A leakage in our gas cleaning system will not be noticed, because methane is odorless and therefore will not be detected in its natural form. Inside the Sulaway enclosure a detecting camera is mounted to detect any deformities in the passing gas and can sound an alarm. For environmental purposes the process enclosure is ventilated up to the gas cleaning filter of the flue gas chimney.
The treated (RNG) is odorized up to 16 mg/m3 thiolan (C4H8S). This is a gas with an unpleasant odor warning for leakage of gas pipes, furnaces, etc. Less costly is to use the Sulaway cleaning package and lower the H2S content to 15 ppmV. However most customers want to do the odorizing by a third party, which is called the gate keeper. The keeper checks the Wobbe index and the end client prefers a H2S content lower than 15 ppmV most of the times. The Wobbe index is a combustion indicator; the higher the value the more heat can be generated.