Keywords: extended exergy accounting, exergy analysis, flares, flaring, oil fields, environmental damage, chemical pollutants, air pollution, resource costs, product costs, hot gas recycling
Extended exergy accounting applied to the flaring practice in oil fields
An original procedure based on the Extended Exergy Accounting method is described and implemented in this paper. The goal is the quantification of the environmental externality linked to the chemical pollutants released by an elevated flare stack (SOx and NOx). The extended exergy calculations provide a measure of both the exergy flux released into the environment by the stack and its 'cost' in primary resource equivalents. Idealised processes are assumed for the effluent treatment, but nevertheless, it is shown that the inclusion of the environmental externality bears a non–negligible influence on the final resource cost. As a further example of application, it is shown that both the environmental damage and the product costs can be reduced if hot gas recycling is enforced.