|Speciale, 3. modul, , id:283|
|Findes på RUb:||Ja|
This thesis examines the effect of installing the DONG degassing plant in 2009. The evaluation focuses on the environmental, technical and economic aspects of the technology. The effect of the degassing plant on the environment is evaluated through a tracer release experiment using acetylene (formel) as a trace gas to determine the change on emission as a result of installation of the degassing plant. This is used as a basis for modelling the VOC concentration distribution on the northern hemisphere using the DEHM model. The concentration data are subsequently used in a 1-D RCM for modelling the change in radiative forcing as a result of the installation of the DONG degassing plant. The technical aspect is evaluated through a determination of the inherent availability and the energy-production relationship determined from production data. The economic aspect is evaluated through a cost-benefit analysis with stakeholders being respectively the users of the oil pipe and the society. Due to the small amount of measurements performed in the present project, the environmental effect of the installation of the DONG degassing plant remains inconclusive. Based on earlier measurements the modelling show a concentration change as a result of the change in emission of up to (formel) ppm with the majority concentrated around Fredericia. The inherent availability is shown to have been 96% in the period from the installation of the plant to August 2012, approaching 98% over time. The energy per produced to offgas is shown to be 0.58 MWh/ton. The net present value of the installation of the degassing plant is shown to be approximately zero for the users of the oil pipe and positive for the society.