Gas plant diversity united by economics, flexibility and proven design

摘要

When examining technology options for new gas processing plants, it is important to consider how global gas plant diversity translates into design. It is also necessary to understand the available processing options and the complexity that is introduced by multiple-field processing. GAS PROCESSING CONSIDERATIONS Prior to processing, natural gas comprises a mixture of components (FIG. l). Processing adjusts the composition to allow for production of elements to saleable specifications, and this includes both impurities removal and hydrocarbon treatment. These two aspects (FIG 2) are not independent, and an optimal process scheme will consider synergies between these aspects. The transportation method used for gas—i.e., pipeline or LNG carrier—also impacts processing. For example, the liquefaction process requires removal of water, carbon dioxide (CO2) and C5~= hydrocarbons to typically less than 1 ppmv, 50 ppmv and 0.1 mol%, respectively. Pipeline gas and LNG specifications vary considerably around the globe, and LNG importers may need to spike the product with nitrogen (N,) to reduce calorific value to comply with local specifications.