Combined cycle power plant and method for operation same

Abstract

Since CO2 is identified as a main greenhouse gas, its capture and storage is essential to control global warming. Flexible operation of CCPPs (combined cycle power plants) with CO2 capture system (18) will increase the competitiveness of CCPPs designed for CO2 capture and will allow earlier introduction of this kind of plants. The main objective of the present invention is to increase the CCPP net power and improve the operating characteristics by taking advantage of the additional power and flexibility, which can be obtained with supplementary firing (10) in CCPPs with flue gas recirculation and CO2 capture systems (18). One particular aim is to minimize the impact of CO2 capture on the capacity of a power plant, i.e. to maximize the electric power the plant can deliver to the power grid. To this end an operating method, in which the power consumption of CO2 capture system is at least partly compensated by the operation of supplementary firing (10) in a HRSG (9) with low residual oxygen concentration in the flue gases (8), which is due to flue gas recirculation, is proposed. Further, additional ambient air and / or oxygen (11) injection into the supplementary firing (10) with corresponding operating methods are proposed. Besides the method a CCPP designed to operate according to this method is subject of the present invention.

Description

technical field [0001] The present invention relates to an integrated CO 2 Capture and afterburner combined cycle power plants and their operation. Background technique [0002] In recent years, it has become apparent that the production of greenhouse gases leads to global warming and that further increases in the production of greenhouse gases will accelerate global warming. Because CO 2 (Carbon dioxide) is recognized as a major greenhouse gas, so CCS (Carbon Capture and Storage) is seen as one of the potential major means to reduce the release of greenhouse gases into the atmosphere and control global warming. In this context, CCS is defined as CO 2 The process of capturing, compressing, transporting and storing. Capture is defined as a process in which CO 2 Either from the flue gas after combustion of the carbon-based fuel, or by removing and treating the carbon prior to combustion. Any absorbent, sorbent or used to remove CO from flue gas or fuel gas streams 2 The...

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Problems solved by technology

CO 2 This change in concentration for CO 2 potentially detrimental to the performance, efficiency, and operability of capture systems

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