This thesis in mechanical engineering has been conducted in collaboration with Camatec Industriteknik AB, to find new concepts for the burner of biogas flares from Biogas Systems AB. Biogas flares are needed to burn off surplus volumes that arise for various reasons during the extraction of biogas. This is mainly because most of the biogas consists of methane, which is a strong driver of the greenhouse effect. As the overpressures involved are very small, below 400 [mbar], the aim was to find a better solution in terms of pressure drop, flow control and mixing relative to the current design.  Using a Double Diamond based approach, data in terms of governing standards together with functional, environmental, and economic requirements was gathered through literature search and study visits. This formed the basis for the creation of a requirements specification.  Through research into existing or nearby solutions, as well as pure idea generation sessions, the nine concepts were developed. These were then sifted, using the requirements specification as a basis, down to two, which were modelled and further developed. The two concepts were compared with an existing model from Biogas Systems AB as a benchmark, using basic CFD analysis. For this, an analysis strategy and fluid domains were designed to look at pressure drops at different flows, flows at different inlet pressures and to evaluate the influence of geometry on the conditions for good mixing of biogas and air. From the analysis, it appears that both concepts perform better than the current design, relatively speaking. However, one concept is not necessarily better than the other, as the choice depends on circumstances. Although a complete picture of reality cannot be given, and a number of simplifications have been made, the results suggest that with fairly simple means it is possible to create a solution that is more favourable with respect to all three aspects.