Off-design point modelling of a 420 MW CCGT power plant integrated with an amine-based post-combustion CO2 capture and compression process

Abstract

The use of natural gas for power generation is becoming increasingly important in many regions in the world. Given that the combined cycle gas turbine (CCGT) power stations are lower in capital cost and carbon intensity than their coal-fired counterparts, natural gas fired power stations are considered a vital part of the transition to a low carbon economy. However, CCGTs are not themselves "low carbon" and in order to reach a carbon intensity of less than 50 kg CO2 /MWh, it will be necessary to decarbonise them via CCS, with postcombustion CCS currently regarded as being a promising technology for this application. In this study, we present a detailed model of a 420 MW triple-pressure reheat CCGT and evaluate its technical and economic performance under full and part load conditions. We evaluate the technical performance of our CCGT model by comparison to an equivalent model implemented in Thermoflow THERMOFLEX and observe agreement of power output and efficiency to within 4.1% and the temperature profile within the HRSG within 2.9%. We further integrate the CCGT with a dynamic model of an amine based CCS process, and observe a reduction in the base plant efficiency from 51.84% at full-load and 50.23% at 60% load by 8.64% points at full-load and 7.93% points at 60% load. A core conclusion of this paper is that CCGT power plants equipped with post-combustion CCS technologies are well suited to dynamic operation, as might be required in an energy system characterised by high penetrations of intermittent renewable power generation.

Optimisation and evaluation of flexible operation strategies for coal- and gas-CCS power stations with a multi-period design approach

“…The eciency of the standalone CCGT model is 59%, based on the Siemens SGT5-4000F gas turbine [50], while integrated with the capture plant is 53%. This is a 6% eciency penalty for capture which agrees with the literature [49], [41].…”

Techno-economic analysis of oxy-combustion coal-fired power plant with cryogenic oxygen storage

“…Hence, given comparable economic performance of these cases, as well as lower energy losses and better expected flexibility in Case 2, the former would be preferable. Nevertheless, such performance agrees with carbon tax values ranging between 27 €/tCO2 and 45 €/tCO2 that were reported in the literature to yield higher profit for power systems with CO2 capture over the unabated systems[77,78]. Effect of a change in a) carbom tax and b) peak price difference on daily profit…”

Designing a Sustainable University Recharge Area for Electric Vehicles: Technical and Economic Analysis

“…During the solar energy production peak, the high voltage lines are saturated, and CCGT plants [65] have to reduce the generation of power, working as regulation plants. A reduction of the economic margins of production due to the poor use of the plants, has caused a significant erosion of profitability and yield, thus modifying the CO 2 coefficient.…”