What is a Velox Boiler ?

A Velox boiler is a supercharged boiler.  The Velox boiler is based on the principle that when the velocity of the exhaust gases exceed the velocity of sound, the heat transfer increases greatly. 

The flue gases are used to drive a gas turbine coupled to a compressor which compresses the gas from the atmospheric pressure to the furnace pressure. 

The Velox Boiler has a very high combustion rate.  It can be quickly started.