On the off-design of a natural gas-fired combined cycle with CO2 capture

Summary, in English

During the last 15 years cycles with CO, capture have been in focus, due to the growing concern over our climate. Often, a natural gas fired combined cycle with a chemical absorption plant for CO, capture from the flue gases have been used as a reference in comparisons between cycles. Neither the integration of the steam production for regeneration of amines in the combined cycle nor the off-design behaviour of such a plant has been extensively Studied before. In this paper, the integration of steam production for regeneration of the amines is modelled at design load and studied in off-design conditions for a combined cycle. Different ambient conditions and part-load strategies and their influence on the cycle performance are also examined. Of particular interest is a novel strategy with the possibility of longer life of gas turbine blading, with marginal loss in efficiency. The off-design performance of the combined cycle is modelled in a rigorous Way using a gas turbine performance deck, while the boiler is calculated using simplified correlations for oft-design heat transfer and pressure drop. The steam turbine calculation is based on verified models for the flow-pressure-efficiency relations, whilst the steam condenser is based oil the HEI method.

• Author: Björn Fredriksson Möller; Magnus Genrup; Mohsen Assadi
• Department/s: Thermal Power Engineering
• Publishing year: 2007
• Language: English
• Pages: 353-359
• Publication/Series: Energy
• Volume: 32
• Issue: 4
• Links: http://dx.doi.org/10.1016/j.energy.2006.07.022
• Document type: Journal article
• Publisher: Elsevier
• Topic: Energy Engineering
• Keywords: off-design; CO2 capture; combined cycles
• Status: Published
• ISBN/ISSN/Other: ISSN: 1873-6785