Delay Ignitor Cap, Blowback Ignitor Cap, and Combination Ignitor Cap for a Thermal Lance and Thermal Lances Including Such Ignitor Caps

An ignitor cap for a thermal lance comprising:

• a proximal end adapted to receive the thermal lance;
• a distal end;
• a housing having a sidewall extending from the proximal end to the distal end and defining a passageway;
• and
• internal primary fuel and secondary fuel disposed within the passageway of the housing, at least a portion of the internal primary fuel in contact with the secondary fuel,
• wherein the distal end of the ignitor cap is substantially sealed and the proximal end of the ignitor cap includes at least one opening such that, when the thermal lance is received in the proximal end of the ignitor cap, gas flows from the thermal lance into the proximal end of the ignitor cap, axially through the internal primary fuel and the secondary fuel, and is then redirected by the sealed distal end of the housing back through the internal primary fuel and the secondary fuel and out through the at least one opening and along an exterior surface of the thermal lance.