Abstract
This paper presents the results of a study on modifying a pulverized coal-fired steam boiler in a 250 MWe power plant for oxygen combustion conditions. The entry point of the study is a boiler that was designed for standard air combustion. It has been proven that simply substituting air by oxygen as an oxidizer is not sufficient for maintaining a satisfactory operating mode, not even with flue gas recycling. Boiler design optimization aggregating modifications to the boiler’s dimensions, heating surfaces and recycled flue gas flow rate, and specification of a flue gas recycling extraction point is therefore necessary in order to achieve suitable conditions for oxygen combustion. Attention is given to reducing boiler leakage, to which external pre-combustion coal drying makes a major contribution. The optimization is carried out with regard to an overall power plant conception for which a decrease in efficiency due to CO2 separation is formulated.
Highlights
Ecological requirements on greenhouse gas emissions have led to the development of CO2 capture and storage techniques for power facilities
One of these methods is OXYFUEL, which is based on fuel combustion with oxygen
The main benefit of hydrocarbon fuel combustion with oxygen is that the flue gas consists mostly of carbon dioxide and water vapor
Summary
Ecological requirements on greenhouse gas emissions have led to the development of CO2 capture and storage techniques for power facilities. One of these methods is OXYFUEL, which is based on fuel combustion with oxygen. Substituting air by oxygen fundamentally changes the combustion conditions and the flue gas convection and heat transfer in the boiler. These changes have a significant impact on boiler design
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