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978-3-8439-3005-5, Reihe Energietechnik
Andreas Nepomuk Baumgartner
Experimentelle Untersuchungen zur Oxyfuel-Verbrennung – Einfluss verschiedener Prozessparameter auf Umsatz, Sauerstoffbedarf und Emissionen
201 Seiten, Dissertation Technische Universität München (2016), Softcover, A5
According to the forecasts of the International Energy Agency the global demand for coal which is used for power generation will be increasing in the near future. This is due to its geographically evenly spread distribution and its vast reserves. Different Carbon Capture and Storage (CCS) technologies are already available to set the stage for a change towards a renewable energy supply.
One of the most promising CCS technologies is oxyfuel combustion. During this process fuel is burned with pure oxygen and recycled flue gas. The recycled flue gas is required to moderate the flame temperature. After the combustion process the flue gas mainly consists of carbon dioxid. The carbon dioxid is prepared for the storage facility without much post-processing treatment.
The aim of this thesis is to investigate and optimize the economic issues of the oxyfuel combustion, such as oxygen demand and fuel conversion. Furthermore, the flame stability and the emission behaviour under oxyfuel conditions are examined.
For the investigation of the oxyfuel flame an existing, horizontally fired multiburner combustion chamber has been modified to feature a moveable top-down fired single burner. The influence of the recycle ratio, the burner geometry and the oxygen to fuel ratio on the oxyfuel process has been studied. In addition, an alternative system of oxygen supply for the combustion has been approved.
The results show that an efficient combustion of a pulverised fuel under Oxyfuel conditions is possible and higher conversion rates compared to air combustion are feasible. Furthermore, the gas emissions are lower under oxyfuel conditions. By the alternative air supply benefits in flame stability and conversion rates were achieved.
The technical problems of oxyfuel combustion in power plants seem to be manageable. However, the ongoing climate change, political situation and public awareness will decide on the commercial use of the oxyfuel technology in a power plant.