Gaseous fuel mixers

A system for combusting a mixture of gaseous fuels, the system comprising:

• a gaseous fuel mixer including
• a first conduit configured to receive natural gas from a natural gas supply and including a terminal portion including a side wall and an end wall,
• a second conduit configured to receive hydrogen gas from a hydrogen gas supply and surrounding at least a portion of the first conduit including the terminal portion,
• a flow passage extending intermediate the first conduit and the second conduit;
• a plurality of orifices formed in the terminal portion of the first conduit and configured to provide natural gas flow from the first conduit to the flow passage, and
• a plurality of swirl vanes extending form the side wall of the terminal portion of the first conduit into the flow passage and toward the second conduit and positioned at locations adjacent to the plurality of orifices, the plurality of orifices and the plurality of swirl vanes are configured to provide turbulent mixing of natural gas flow and hydrogen gas flow and output a mixture of natural gas and hydrogen gas;
• and
• an industrial oven including a burner configured to receive the mixture of natural gas and hydrogen gas output by the mixer and combust the mixture to heat cure an uncured article introduced into the industrial oven.