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High Temperature

A New Design of High Temperature Fans and Blowers for Operating Up to 2,200 F is Introduced by Canada Blower

Canada Blower Co. has just increased the operating temperature limit of its unique line of high temperature fans and blowers for industrial applications to 2200 F. This was achived by using extremely high strength stainless steel alloys for the fans impellers, that allow for higher safe speeds at elevated temperatures.

The Canada Blower high temperature oven fans line now include:

- Operating up to 2200 F, centrifugal, axial and plug fan types;

- Pre-engineered and custom made fans for all types of applications with vaiety of impeller types and accessories;

- Canada Blower engineers provide a professional advice and recommend a right fan for every application & oven / plenum design;

- The fan offering provides competitive replacement fans to Garden City, Lau, IGE, Alloy Fabricating fan models; repairs, re-build & balancing;

- Unique high temperature water-cooled motors for operation up to 2300 F.

Fans with ambient air cooling systems handling hot airstreams must have sufficient airflow and be kept in operation until airstream temperatures cool below 120 F to prevent damage to the fan unit. The Tubeaxial fan ambient air cooling system is only effective while fan is operating.

There are two major types of high temperature fans - centrifugal and axial:

Centrifugal Wheels:

* Multiblade forward curve wheel. This type of wheel is usually specified where there is a necessity for large volumes of flow against low to medium static pressure requirements. The forward curve blade is that it delivers the same volume of air as either the backward or radial blade wheel, at a lower fan speed, which is important due to wheel stresses at elevated temperatures. This fan is the most common type used in all types of heat treatment operations except where a buildup of material on the blades could occur, as wheel unbalance would result.

* Radial Blade, paddle wheel type fans. This type of wheel is usually specified where there is a necessity for medium volumes of flow against medium to large static pressures. The paddle wheel is considered a self cleaning type of wheel. It could be used where there are various materials or dust in the air stream. Due to its structurally strong design, it is used in many heat treatment applications at very high temperatures where maximum fan longevity is desired.

Axial Blade Wheels:

* The axial blade wheel is usually specified where there is a need for very large volumes of flows against low static pressure. Axial wheel like the multi-blade forward curve type wheel could cause an axial fan to deliver different air volumes at the same static pressure, if the total pressure requirement of the fan system was underestimated. This type of fan is ideally suited where a large volume of flow is required with a minimum of duct work and is used extensively for small and large furnaces, such as aluminum annealing.

Fans handling hot airstreams must have sufficient airflow and be kept in operation until airstream temperatures cool below 120 F to prevent damage to the fan unit. The Tubeaxial fan ambient air cooling system is only effective while fan is operating.

For additional information please refer to http://canadianblower.com/news/index.html.

Oleg Tchetchel, Ph.D

Canadian Blower

http://canadianblower.com/index.html

http://canadianblower.com/oem/index.html

About the Author

Chemical Physics Engineer

How is low temperature geochemistry distinguished from high temperature geochemistry?

What sort of topics of research are considered to be high temperature geochemistry and what sort of topics of research are considered to be low temperature geochemistry?

Low temperature generally refers to surface or near surface conditions. There isn't a line that separates low from high temparature geochemistry though.

Early diagenesis, weathering phenomena, surface water chemistry, element mobility in surface or shallow groundwater, some reaction kinetics, stable isotope behavior in the near surface environment, that sort of thing would be low temperature geochemistry. Stuff that would be affecting or would affect stuff around us, more or less.

High temperature geochemistry more addresses petrology (geochemical and mineralogical behavior) of magma and metamorphic systems, hydrothermal chemistry (although the lower end of that spectrum could be considered low temeperature, where waters cool below 100 C),

I suspect that a good way to look at it would be systems where the thermodynamic parameters are close enough to be modelled by STP with little need to take into account pressure and temperature effects would be judged low temperature geochemistry. If one has to calculate the required thermodynamic parameters by extrapolating from STP values, one would be into high temperature geochemistry.

That is, there is generally a wealth of thermodynamic data applicable to low temperature processes, but this data needs to be calculated, or derived from experiment, for high temperature (and pressure) processes.

Charlie Musselwhite - High Temperature