Extraction of hot gas for reagent vaporization and other heated gas systems

A system for vaporizing reactive reagents for use in selective catalytic reduction systems without any moving mechanical parts becoming exposed to hot exhaust flue gas and/or reactive reagent vapor comprising:

• a first source of compressed gas;
• a venturi ejector having an input port, a suction port and an output port with the first source of compressed gas providing compressed gas to the input port;
• a hot gas inlet pipe for providing hot gas from an exhaust flue;
• a hot gas outlet pipe for reintroducing a gas mixture into the exhaust flue downstream of the hot gas inlet pipe whereby a vacuum at the suction port draws hot gas from the exhaust flue and through the hot gas inlet pipe and the compressed gas and hot gas mixture exiting the outlet port is forced through the hot gas outlet pipe and back into the exhaust flue;
• and
• a reaction vessel having a gas inlet and a gas outlet disposed between the hot gas inlet pipe and the hot gas outlet pipe in fluidic communication therewith, the reaction vessel comprising:
• a reactive reagent atomizing device within the reaction vessel;
• and
• a source of reactive reagent operatively connected to the reactive reagent atomizing device.