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type     June, 2005

Vol 1 Chapter 26: The Oxyfuel Baseline: Revamping Heaters and Boilers to Oxyfiring by Cryogenic Air Separation and Flue Gas Recycle

Rodney Allam, Vince White, Neil Ivens and Mark Simmonds

Abstract: This feasibility study involves the potential application of oxyfuel technology on a refinery-wide basis at the BP Grangemouth unit in Scotland. A total of seven boilers and 13 process heaters of various types, burning a mixture of refinery fuel gas and fuel oil resulting in the production of approximately 2.0 million tonnes per annum of CO2, form the basis of this study. This work considers the issues involved in modifying the process heaters and boilers for oxyfuel combustion and locating two world scale air separation plants totalling up to 7400 tonne/day of oxygen plus a CO2 compression and purification system on a congested site. In addition, we present the scheme for distributing the oxygen around the site and collecting the CO2-rich effluent from the combustion processes for purification, final compression, and delivery into a pipeline for enhanced oil recovery. The basic case, Case 1, is presented and costed involves the supply of the complete oxyfuel system with installation and start-up and includes all required utilities. The electrical energy required for the system is provided by a GE 6FA gas turbine combined cycle cogeneration unit with 10.7 MW of excess power available as surplus. Two further cases are also presented. The first uses a GE 7EA gas turbine plus heat recovery steam generator producing steam primarily at the refinery condition of 127 barg 518 8C together with some additional supplies at 13.7 barg. The steam production from the existing boilers is reduced by a corresponding amount. The third case uses a similar 7EA gas turbine plus heat recovery steam generator, but in this case the fuel is hydrogen produced from an oxygen autothermal reformer with product steam generation and CO2 removed using a methyl diethanolamine (MDEA) system. In each of these three cases the total quantity of CO2 emission avoided and the quantity of CO2 available for pipeline delivery is calculated, costed and presented in Table 1.

Carbon Dioxide Capture for Storage in Deep Geologic Formations – Results from the CO2 Capture Project Capture and Separation of Carbon Dioxide from Combustion Sources - Volume 1
Edited by:
David C. Thomas, Senior Technical Advisor, Advanced Resources International Inc, USA

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