Has GE looked into the impact of a retrofit of a carbon capture plant on HRSG performance? What does the future look like for HRSGs in terms of adding renewables?
GE has carried out numerous carbon capture readiness studies for its fleet. The impact of a retrofit post carbon capture plant on the performance of the HRSG and the broader combined cycle plant depends on multiple parameters such as: the preferred carbon capture technology, full capture or partial capture, CO2 capture rate, the size of the PCC plant and the ratio between Natural Gas/ Hydrogen or any other biofuel used in the GT.
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With the evolving market, there’s a need for the combined-cycle plant to operate in a more flexible manner—meaning faster ramp up, improved turndown, and potentially using different fuels ranging from natural gas to hydrogen and other biofuels. On the gas turbine side, we can balance the “black box” of operability—maintaining our dynamics, emissions, and flame stability.
However, the gas turbine increased turndown capability needs to be evaluated against the potential increase of thermal gradients and fatigue in the HRSG. Changes in the GT operating regime could drive increased unreliability and O&M costs for the HRSG.
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