I am trying to get a handle on the typical impact of changing from HFO firing to gas firing for a steam boiler plant. I have heard arguements that thermal efficiency will drop (by between 2 and 4%) as a result of increased latent heat losses in the fuel gas due to the higher hydrogen content in gas. This argument seems a little simplistic to me as a multitude of other factors may act to minimise this impact or even result in a small efficiency improvement. Does anyone have any good insights???? What is the likely impact of a fuel change on efficiency and why?
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