Talk:Gas turbine locomotive
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[edit] Coal-firing
I have moved this text (which is speculative) from the main article.
Robertson shows a diagram which confirms Sampson's information but also refers to problems with erosion of turbine blades by ash. This is strange because, with a conventional shell and tube heat exchanger, there would be no risk of ash entering the turbine circuit. This may simply be a mistake (due to confusion between the US and UK projects) or it may be that a different type of heat exchanger was used. A possible explanation is that a "batch-type" heat exchanger was used in an effort to obtain higher efficiency. This would have consisted of two chambers, packed with fire brick, which would be used alternately. One would be heated by the combustion gases while the other was heating the air in the turbine circuit. Neither source identifies the type of heat exchanger used and further research is needed.
Other contributors may have additional information. Biscuittin (talk) 11:32, 1 February 2008 (UTC)
