Gas turbine recuperators have been put in operation in a number of applications, although the experience on liquid fuel has been minimal. Possibilities of liquid fouling of the compact surfaces of recuperators has been a significant concern.
A extended duration fouling test of a compact recuperator was conducted using a simulated gas turbine exhaust stream from a commercial dry low NOx atmospheric combustion system. This combustion system has consistently demonstrated operation with negligible smoke and low NOx emissions. The low smoke significantly reduces the likelihood of fouling of downstream equipment. Fouling of the recuperator was virtually undetectable after 1000 hours of operation. Visual inspection of the recuperator core confirmed there was no soot buildup of any kind.