Heat recovery steam generators |
Hydrogen firing in gas turbines and its impact on HRSGs
Hydrogen firing in gas turbines is currently attracting huge interest, but it is important not to neglect its potential implications for heat recovery steam generators and associated equipment such as bypass stacks
Gayathri Hariharan, Pin-Hsuan Lee, Peter Rop, Sebastiaan Ruijgrok, Francesco Perrone NEM Energy
Global pressure to reduce use of traditional fossil fuels and cut emissions of greenhouse gases such as carbon dioxide is enormous. Consequently, the gas turbine industry is taking action. One of the key focus areas for reducing carbon dioxide emissions from gas turbines is to switch fuel from natural gas (typically CH4
) to hydrogen.
The various gas turbine OEMs, as well as utilities and other users of gas turbines, are
currently investigating the impact of firing H2 in their machines. A lot less attention is given to the impact of hydrogen firing on equipment complementary to gas turbines, notably heat recovery steam generators (HRSGs), to which a large proportion of the global gas turbine fleet is connected. Mixing H2
immediate CO2
with natural gas will result in an emission reduction from gas
turbines. The graph on p13 shows the non-linear relationship between increasing the hydrogen content (%vol) in a natural gas fuel mixture and the resulting CO2 significant CO2
emissions (%vol). The most the last ~20% (by vol) of natural gas with H2
savings are gained from replacing .
But there are potential side effects for HRSGs of increased hydrogen firing that need to be considered. Depending on the gas turbine
conditions set by the gas turbine OEM, the following considerations require attention: First of all safety aspects, related to potential
H2
accumulation in the ‘attic’ of the HRSG in case of a gas turbine or duct burner trip. Higher NOx
emissions in the incoming gas
HRSGs in a combined cycle power plant. (Source: NEM Energy)
Above: NEM Energy timeline 10 | October 2023|
www.modernpowersystems.com
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