Development of volumetric systems for quality assurance of biogas and vehicle gas

Purpose and goal

Several volume measurement systems for sampling for quality assurance of biogas and vehicle gas with respect to impurities were developed during the project. The methods that have been developed and tested during the project are now used to sanple biogas and vehicle gas for the Swedish and European gas industry. The new methods contribute to better accuracy in sampling.

Expected results and effects

The new methods contribute to better accuracy in sampling. In addition, there are other potential applications, such as when sampling hydrogen fuel for purity. The methods have also been used in the ongoing EMPIR MEtroHyVe project. Results clearly shows that the mass flow meters that have been tested are versatile flow meters that give an accurate measurement of flow regardless of the gas. Most interesting is that it is also well suited for gases containing several substances, provided that the read value is corrected by a factor where the gas viscosity is the most important contribution.

Planned approach and implementation

Two systems were developed and implemented. System 1: flow measurement with correction method Calibration of thermal mass flow meter for 10 gas compositions at constant temperature. Study of the influence of other parameters (T, non-stationary conditions, influence of pressure drop through the adsorbent) Preparation of a calibration matrix and equation including composition / temperature / flow System 2: direct volume measurement with syringe. Comparison with System 1 Design and construction of portable field equipment Article, Conference presentation