Composite tube for heating gases
AssigneeJogema Holding B.V.
InventorJohannes J. Broodman
Life of this patent
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Abstract
Composite tube for heating gases to very high temperatures, in particular for generating steam, comprising at least one internal combustion or heating tube (6), an external reinforcement (3) which surrounds the internal tube (6) and spacer means (2,5) for separating the internal tube (6) from the external reinforcement, in which the materials of the internal tube (6) are resistant to the milieus of the heating gases coming into contact with this tube. A jacket tube (1) may be placed between the internal combustion or heating tube (6) and the external reinforcement (3). In the composite tube of this invention the heating tube wall thickness can be reduced and higher temperatures and heat flows can be achieved than hitherto possible.
Claims20
Composite tube adapted for heating gases to temperatures in excess of about 1300.degree. C., comprising:
- (a) an internal combustion or heating tube which is adapted to carry internally, heating gases at a temperature in excess of about 1300.degree. C., which tube is resistant to the milieus of the gases, and has high heat transfer properties;
- (b) an external reinforcement of high strength which completely surrounds said internal tube, and which consists essentially of molybdenum, tungsten, tantalum, niobium or a mixture thereof;
- (c) spacer means separating said internal tube from said external reinforcement;
- (d) a passageway for gases to be heated located between said external reinforcement and said internal combustion and heating tube such that gases to be heated contact the internal combustion or heating tube externally;
- (e) means for supplying gases to be heated to said passageway;
- and
- (f) means for supplying heating gases at a temperature in excess of about 1300.degree. C. internally of said internal combustion or heating tube.
Dependencies are inferred from the claim text.