A study of the interface between CO_2 capture and transport

摘要

A study of the interface between natural gas powerplants with CO_2 capture and different CO_2 transport processes for both pipeline and ship transport is performed. It becomes evident in this context that there is a lack of thermodynamic data for CO_2 rich mixtures. In order to design the gas conditioning and transport processes it is crucial to describe and implement advanced thermodynamic equations. The energy requirement for the transport processes are normally between 90 and 120 kWh/tonne CO_2, this does, however, depend on the inlet pressure, the composition and the transport process. The loss of CO_2 in the water purge is small for most capture processes. The inert waste streams from the gas conditioning processes may contain large amounts of CO_2 and should be further processed or reintroduced at an appropriate point upstream in the capture or gas conditioning process if possible. Power process with CO_2 capture should be designed together with the transport processes to reduce the costs, increase the efficiency and minimise CO_2 emissions.