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[April 2003]
Launches from Kanthal AB
Kanthal AB (Hallstahammar, Sweden) prepared a number of new products for the
Thermprocess 2003 exhibition in Düsseldorf.Globar SD is a new grade of silicon carbide heating element which has been
designed for maximum performance in the widest range of high temperature
applications. It is described as combining all the best features of the
existing Kanthal Hot Rod, Silit ED and Globar LL products to offer high
mechanical strength, a lower rate of reaction with the process atmosphere
and longer life potential.Although new to the market, an extensive laboratory testing programme has
been supplemented by field trials. Over 2,000 Globar SD elements have been
installed in furnaces world-wide and are reported to have performed well in
a variety of applications - from continuous and batch production of ferrite
at 1200°C to 1450°C, to low pressure aluminium diecasting, continuous heat
treatment of steels, float glass production and firing alumina ceramics.Kanthal Super ER is a new element offering the benefit of working in a range
of different furnace atmospheres in temperatures to 1600°C. It is now
possible therefore, says Kanthal, in one furnace to operate firing cycles
where the atmosphere condition can be altered, during the cycle, between
oxidising, inert, endogas and reducing atmospheres. The main applications
are seen as most types of sintering furnace working in reducing atmospheres
such as dry hydrogen, nitrogen and endogas.Kanthal Super RA has been designed specially to work in nitrogen atmospheres
at temperatures above 1250°C and to minimise the problems of element
scaling caused by nitration.Other elements include Kanthal Super HT, claimed to have outstanding high
temperature properties in air or oxygen and Kanthal Super NC, designed for
use in 'clean' process heating up to 1800°C.Kanthal's Ecothal is a new gas treatment system which has the potential for
reducing nitrous oxide (NOx) emissions from gas fired radiant tube heaters
by over 75%. At the same time, explains the company, thermal efficiency is
also increased.Ecothal comprises a catalyst package located in the burner to reduce nitrous
oxide emissions and another oxidation catalyst to reduce CO and unburned
hydrocarbons. Following extensive testing both in the laboratory and on an
industrial scale, results show that a NOx level of less than 50ppm is
achieved as standard compared to about 200ppm with conventional systems. By
using special mixture tubes, there is an increase in thermal efficiency to
around 75%-80% compared to 60%-70% or worse for conventional systems.Ecothal is made with Kanthal APM tubes - a FeCrAl material which the company
says has outstanding properties of corrosion resistance at high temperature.www.kanthal.com
ENDS