Dual fuel burner

In a burner mountable in a passageway leading into a furnace, including:

• a. a hollow housing received by said passageway, having a discharge end opening into said furnace;
• b. a first conduit, within said housing;
• c. a second conduit, within said first conduit;
• wherein said housing, said first conduit and said second conduit are respectively annularly spaced;
• d. means for introducing respective fuels into space between said first and second conduits and into said second conduit;
• e. means for introducing a gas into space between said housing and said first conduit;
• f. fins within said housing, proximate said housing discharge end, for inducing swirling motion of gas discharged from said housing into said furnace;
• g. means for discharging respective fuels from said first and second conduits into said furnace through said housing discharge end;
• the improvement comprising:
• h. said housing discharge end extending into the furnace interior;
• i. said discharge means being recessed within said housing from said housing discharge end;
• j. said discharge means comprising:
• 1. a sleeve receiving said first conduit therewithin and extending forwardly therefrom;
• 2. a cap connected to the end of said sleeve proximate said housing discharge end, including an inwardly facing lip about a discharge end thereof proximate said housing discharge end, said lip defining the outlet end of said discharge means;
• and
• 3. a nozzle interior of and spaced annularly from said sleeve, connected to the discharge end of said second conduit, including:
• a. a chamber therewithin communicating with said second conduit;
• b. a recess facing said housing discharge end, recess periphery contacting said lip of said cap;
• c. channels therewithin extending from space between said sleeve and said nozzle into said recess, channel orientation being defined by half chords of a circle having a center at the longitudinal axis of said nozzle;
• d. conduits connecting said chamber and said channels;
• and
• k. said fins being recessed within said housing from the outlet end of said discharge means.

In a burner for mounting in a passageway leading into a furnace, including:

• a. a hollow housing complementally received by said passageway, having a discharge end opening into said furnace;
• b. a first conduit, within said housing, having a discharge end proximate said housing discharge end;
• c. a second conduit, within said housing, having a discharge end proximate said housing discharge end;
• wherein said housing, said first conduit and said second conduit are respectively annularly spaced apart,
• d. means for introducing respective fuels into space between said first and second conduits and into said second conduit;
• e. means for introducing air into space between said housing and said first conduit;
• f. fins within said housing, proximate said housing discharge end, for inducing swirling motion of air discharged from said housing into said furnace;
• g. means, at said discharge end of said first conduit, for discharging respective fuels from said first and second conduits into said furnace through said housing discharge end;
• the improvement comprising:
• h. said housing discharge end extending into the furnace interior;
• i. said discharge means being recessed within said housing from said housing discharge end;
• j. said discharge means further comprising:
• 1. a sleeve threadedly engaging said first conduit discharge end for receipt of fluid from said first conduit by said sleeve interior;
• 2. a cap forward of said sleeve, threadedly engaging said sleeve and coaxial with said cap, having a radially inwardly extending annular lip about a cap discharge end proximate said housing discharge end, an inner circular edge of said lip defining a discharge means outlet;
• 3. a nozzle within and annularly spaced from a lateral wall of said sleeve, connected to the discharge end of said second conduit, including:
• i. a chamber therewithin communicating with said second conduit for receipt of fluid therefrom;
• ii. a cylindrical recess formed therein facing said housing discharge end, the recess cylindrical wall being aligned with said inner circular edge of said lip;
• iii. channels formed therewithin connecting annular space between said sleeve and said nozzle with said recess, said channels having flat bottoms, channel sides being normal to said channel bottoms, said channel bottoms being coplanar with the bottom surface of said recess;
• iv. conduits connecting said chamber with said channels and said recess, said conduits communicating with respective channels at channel-recess juncture;
• k. said lip abutting said nozzle about said recess and covering said channels to thereby define closed tops of said channels;
• l. said fins being recessed within said housing from said discharge means outlet end.