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US 7,052,646 B2Granted
Igniter for oxygen lance for thermal cutting, drilling etc.
AssigneeFerrox AB
InventorsBorje Ericksson, Lennart Eriksson
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Abstract
In accordance with the method and the device according to the invention, previous pure pyrotechnic primers for initiating the ignition charges (6a, 6b) of the oxygen lance igniters (13) are replaced by a small quantity of powdered zirconium (7). Zirconium is pyrophoric and therefore ignites, providing it has a sufficiently large surface area, in the presence of a sufficient quantity of pure oxygen, although in ordinary air it is no more flammable than ordinary wood.
Claims14
An igniter suitable for igniting a thermal oxygen lance, the igniter comprising:
- an ignition charge comprising a metal powder,
- a sleeve closed at one end thereof which encloses the ignition charge, wherein an inner diameter of the sleeve is greater than a mouth of the thermal oxygen lance;
- a gas-permeable container;
- and
- an initiating charge comprising a pyrophoric metal powder arranged free-lying in the gas-permeable container,
- wherein the gas-permeable container is arranged in the sleeve between the mouth of the thermal oxygen lance and the ignition charge.
3 more elements
A method of igniting an oxygen lance, the method comprising:
- enclosing an ignition charge comprising a metal powder in a sleeve closed at one end thereof;
- providing a gas-permeable container containing a pyrophoric initiating charge comprising a pure metal powder arranged free-lying therein;
- supplying oxygen from the lance to a fine-grained pyrophoric metal powder which ignites on contact with the oxygen;
- and
- igniting the ignition charge from the ignited pyrophoric metal powder,
- wherein the ignited ignition charge and the ignited pyrophoric metal powder cooperate to ensure ignition of the oxygen lance.
3 more elements
Dependencies are inferred from the claim text.