Electric heating – Heating devices – Electric arc-type devices
Patent
1983-03-29
1986-04-22
Paschall, M. H.
Electric heating
Heating devices
Electric arc-type devices
219121PY, 219121PU, 423235, 422306, B23K 900
Patent
active
045844658
ABSTRACT:
A method and an apparatus are disclosed for heating process air for industrial purposes to a predetermined temperature. In one embodiment, the method comprises passing a first air-flow portion through a plasma generator and thus heating said portion to a temperature sufficiently high to cause the ionization of nitrogen and oxygen in the portion and thus form a plasma gas, immediately thereafter adding to said plasma gas a material containing carbon and/or hydrocarbon in sufficient quantity that when said material is reacted with the plasma gas, the ratio CO+H.sub.2 /CO.sub.2 +H.sub.2 O is at least 0.1 thereby substantially avoiding the formation of nitrogen oxide; and immediately thereafter mixing with the plasma gas, with its content of material containing carbon and/or hydrocarbon, a second air flow in such proportion that the predetermined temperature is achieved in the final air mixture. Alternatively, the plasma gas for heating the process air is generated by passing steam through a plasma generator without the addition of material containing carbon and/or hydrocarbon.
REFERENCES:
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patent: 3911083 (1975-10-01), Reed et al.
patent: 4056704 (1977-11-01), Beach et al.
patent: 4302205 (1981-11-01), Muraki et al.
patent: 4316878 (1982-02-01), Akune et al.
patent: 4350669 (1982-09-01), Izumi et al.
patent: 4469508 (1984-09-01), Amouroux et al.
Mathisson Goran
Santen Sven
Paschall M. H.
SKF Steel Engineering AB
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