Ex-High Flux Heaters
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Ex-High Flux Heaters
The high thermal flux shielded resistor technology derives from research carried out at the French Nuclear Studies Centre in Grenoble as part of the thermohydraulic investigations carried out into the cores of nuclear reactors. The specific nature and reliability of this technology have found ready-made applications in the world of industry with performances capable of solving most of the heating issues in places where conventional technologies reach their limits.
The high flux heaters is designed to heat liquids and gases. It heats a fixed or variable flow of fluid to up to 750°C continuously at high pressure levels of up to 250 bar.
Construction consists of a refractory steel or stainless steel envelope with two ports for flanged connections to the inlet and outlet of the fluid to be heated. It contains one or several high flux technology heating rods.
High flux heaters are built in compliance with 97/23/EC Pressure Equipment Directive, as per article 3 §3 categories I to IV. According to your requirement, they can be ATEX 94/9/CE protection EEx d II C certified and mounted on a skid with a full power and control system.
Advantages high flux flow heater relative flow heater with tube elements:
- The high flux watt heaters have a load of 0.5 - 80W/cm2.
- As insulation between coil and outer element is boron nitride applied. Boron nitride conducts heat better than magnesium oxide, that is used by tubular heating elements. As a result, the temperature difference between the heating coil and surface of the element is less than with tubular elements (a large temperature difference increases the probability a heating element will fail).
- A high flux heater equipped with a single high flux element is available with a capacity up to about 80kW.
- Longer life by :
- The heating wires are made of special material and the delta T between the surface and heating spiral is small, so that surface temperatures up to 1000°C are possible.
- The wall thickness of the high flux elements is greater so the corrosion resistance is better and therefore the elements are stiffer and bend less .
- There are multiple hating spirals in a heating element incorporated .
- High flexural strength and impact resistance, even during heating.
- Compact building, as a result of the high watt density.
- Because of the compact construction, the medium runs with high speed through the flow-tube, so that the heating of the outer wall is much smaller than with conventional flow heaters with tubular elements. This can have great advantages in the construction, for example for explosion proof process heaters, where low surface temperatures are importatnt to keep the temperature within a certain temperature class (T1…T6).
- A high flux heater has compared with heater with tubular heating elements with the same power less internal volume. There is relatively little medium in contact with a relatively large heated surface. As a result, the response time of the temperature control (with e.g. thyristor) between the temperature measurement at the outlet side, and temperature change of the element is very short.
- A major advantage of the compact high flux heater is, often a heater only need to be supplied in accordance with PED 97/23/EC art. 3 § 3.
- Due to the low surface temperature of the flow housing sometimes temperature class T6 (+ 85°C) is possible. As a result, it is not necessary to use large flow heaters.
- As a result of particularly compact design is a high flux heater in some configurations cheaper than heaters consisting of tubular elements.
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