Heating systems such as cage elements and heating coil plugs

Coiled and flat heating elements, cage element and much more.

Heating systems such as cage elements and heating coil plugs

Our website with extensive technical information is currently under construction and this page is not yet or not completely available. If you require information in advance on our heating systems as cage elements or on heating candles, we will be happy to provide you with information on this product. Please use the contact form, send us an e-mail or call us on +49 (0) 6074 855-0.

Cage elements and heating coil plugs

Heating Coil Plug

HWK

This type of element, for the horizontal fitting position, was created because of the market requirement and the close collaboration with our customers. A lot of market requirements could be integrated in one construction which can summarize both a technical interesting alternative and cost-efficient solution for our customers. There were used only traditional materials and well known element-forms, which are known to have a long lifetime.

What is special of heating-candles in comparison with other heating-systems:

Producing a maximum heating temperatur of 1350 °C
In spite of small construction dimensions, working with power supply
If bigger construction dimensions are needed, working with 3-phase symmetrically
Spans lengths up to 1500 mm without support (self-supporting if double sided)
The heating element can be replaced very easily

What are the advantages for the customer?

A higher power-density at the same furnace-temperatur
It is possible to use electrical components for controlling with higher power supply voltage and lower current which are cheaper and spents benefit of lower costs
Constantly loading of power-supply
No steel-tube necessary if atmosphere it permits
Lower repairing costs

In some cases, you will not get the benefit of all the advantages at once. This depents upon the requirement of the technical installation. Depending on the requirement of the construction, heating-candles can also be performed with a steel-tube, which is also permitted for using with surface-temperatur up to 1350°C. The blue power-line in the following chart shows you the common parameters as they are used in the plant- and furnace-construction. Comparison between cage-element and heating-candle at temperatur of about 1000°C with about 4 W/cm2 surface-loading and a element-diameter of 158 mm. As you can properly see, the heating-candel HWK uses power supply already at small construction-dimension. The yellow voltage-line of heating-candle HWK, expresses the big difference of voltage in comparison to the red voltage-line of a cage-element. If we have inspired your interest, please leave your heating-problem – to become ours.

Spiral heating coil plug

SINGLE

Do you need information about our “SINGLE” heating coil plug? Then we would be happy to provide you with information about this product. Please use the contact form, send us an e-mail or call us on +49 (0) 6074 855-0.

Cage elements

CAGE

Cage elements consist of metallic parts and ceramic, electrically non-conductive parts such as ceramic plates or spacers. The metal centre rod is necessary to bind the ceramic parts together.

Construction

Holes in the ceramic plates receive the heaters, which in this way are kept electrically insulated from each other. The insulating gap is situated at one end and it is important that is goes from the hot side to the cold area in order to allow the cable to connect to the power supply. The insulation distance can optionally be created by ceramic vacuum formed parts or conventional refractory bricks (further construction requirements can be fulfilled according to customer specifications).

Heaters can be made from approved CrFeAl alloys or from NiCr alloys from our product range. Depending on temperature or atmosphere, a choice must be made as to which of the two classes above will lead to a longer product life for individual use (we can provide you with technical support for this).

Cage elements from Berghütten, in contrast to conventional cage elements, offer features, such as floating ceramic subfloor heating, which ensure that the full temperature range is used and that no unwanted interaction between the ceramic parts, which have different rates of expansion, takes place.

Application fields

Cage elements may be operated in a horizontal position with a branch pipe or in a vertical position with or without a branch pipe. This setup must be decided individually based on the application. Cage elements are mainly employed in continuous furnaces, multi-purpose chamber furnaces or furnace applications where there is a corrosive atmosphere.

Application areas

The maximum of the heating element temperature range is 1250°C for CrFeAl alloy and around 1150°C for CrNi alloys. The standard lengths vary from 400 mm to 2000 mm, which is empirically speaking a very good range for practical use. Other lengths can be produced according to customer requirements and taking into account construction conditions. The installable output is dependent on cage element diameter, length, heating element material and furnace temperature.

Safety equipment

To prevent the heater from overheating, it is recommended to use one safety thermocouple per element or at least one per heating zone.

Accessories

We can supply you with branch pipes and heating conductors of various grades for horizontal mounting of cage elements. In addition, we can include other components, such as connecting bands for high temperatures and trestles, with the delivery, in order to ensure optimal use of the cage element.

In this way, we ensure that every application need is met with a comprehensive solution which results in fast and reliable operation for the customer.

The diagram shows the maximum possible installable output for a cage element per metre, as a function of furnace temperature and diameter of the cage element plate.

Delta plug

POWER

We will be happy to send you information about our “POWER” delta plug on request. Please use the contact form, send us an e-mail or call us on +49 (0) 6074 855-0.

Flat heating coil plug

CLOU

We will be happy to send you information about our “CLOU” flat heating coil plug on request. Please use the contact form, send us an e-mail or call us on +49 (0) 6074 855-0.