Heating element and process heater
AssigneeSandvik Materials Technology Deutschland GmbH
InventorsMarkus Mann, Michael Kramer
Life of this patent
Estimating the term…
Abstract
A heating element for heating gases to high temperatures includes at least one tube arranged for the flow of gas to be heated and an electrical heating wire in the tube, which transfers heat to the gas flowing past. A process heater and a corresponding heating element are provided to permit generation of gas temperatures up to 1000° C. or above and having a lifespan 10 times longer than conventional heating coils. The heating wire is formed as a heating rod extending along the tube axis, whose maximum clear distance to the inner wall of the tube does not exceed a value of 10 mm over at least 80% of the circumference and/or at least 80% of the overlapping length of the tube and heating rod.
Claims18
A heating element for heating gases to high temperatures comprising:
- at least one tube arranged for the flow therethrough of a gas to be heated;
- and
- an electrical heating wire disposed in the at least one tube for the transfer of heat to the gas flowing past the heating wire, wherein the heating wire is a heating rod extending along an axis of the tube, and having a maximum internal spacing relative to an inside wall of the at least one tube that does not exceed a value of 10 mm over at least 80% of a periphery and/or at least 80% of an overlap length of the at least one tube and the heating rod, wherein a ratio of a cross-section of the heating rod to an internal cross-section of the tube is in the range of between 0.04 and 0.95.
A heating element for heating gases to high temperatures comprising:
- at least one tube arranged for the flow therethrough of a gas to be heated;
- and
- an electrical heating wire disposed in the at least one tube for the transfer of heat to the gas flowing past the heating wire, the heating wire being a heating rod extending along an axis of the tube, and having a maximum internal spacing relative to an inside wall of the at least one tube that does not exceed a value of 10 mm over at least 80% of a periphery and/or at least 80% of an overlap length of the at least one tube and the heating rod, wherein the heating rod extends in the form of a continuous solid heating wire in a meandering configuration through a plurality of parallel tubes.
A process heater comprising:
- a housing having a gas feed and a gas outlet;
- a heating space located between the gas feed and the gas outlet;
- at least one electrical heating element disposed in the heating space, the at least one heating element including at least one tube arranged for the flow therethrough of a gas to be heated;
- an electrical heating wire disposed in the at least one tube for the transfer of heat to the gas flowing past the heating wire, the heating wire being a heating rod extending along an axis of the at least one tube, and having a maximum internal spacing relative to an inside wall of the at least one tube that does not exceed a value of 10 mm over at least 80% of a periphery and/or at least 80% of an overlap length of the at least one tube and the heating rod;
- and
- electrical connections for the at least one electrical heating element.
Dependencies are inferred from the claim text.