ATI Industrial Automation
The CGV-900 offers built-in compliance, allowing the unit to compensate for irregularities in part surfaces and maintain contact with a workpiece. The compliance force is adjustable, so users can fine-tune finishing processes in real time.
Dmitry Kalinovsky | Dreamstime
Plasma - or laser - cutting achieves clean cuts that require less grinding or deburring in subsequent finishing steps.
acp systems AG
The wear-free two-substance ring nozzle generates a pulsed jet. It contains a valve specially developed for this purpose and achieves pulse times as fast as 20 milliseconds.
NW Machine Tool Expo
NW Machine Tool Expo

Northwest Machine Tool Expo 2023

May 11, 2023 - May 12, 2023

Turning Up the Heat with Ceramic Heat Exchangers

March 16, 2015
Ceramic heat exchangers reduce or eliminate common problems associated with metal heat exchangers.

Gas-to-gas shell and tube heat exchangers and ceramic materials are a combination that can improve heating processes and manufacturers’ operating costs. 

Heat treating is a critical step for many foundries, which take the additional processing steps in order to seal the castings, to increase hardness, or for various other reasons relating to the design specifications. Handling heat efficiently is a common concern.

In his article, Ceramics Offer a Better Exchange, Will Shepard explains how metal heat exchangers are proven devices in many industrial applications, but process and technology advances have pushed metal heat exchangers beyond their performance limits.  The costly materials required for higher temperature and the frequently corrosive operating environments drive up overall costs and compromise system durability. 

By adopting a ceramic heat exchanger you may reduce or eliminate the common issues that plague metal heat exchangers, issues like: high-temperature alkali attack; high-temperature sulfidation; high-temperature chlorine attack; low-temperature chlorine attack; low-temperature sulfuric acid attack; erosion; and oxidation.  By combining the simplicity of a shell and tube heat exchanger with ceramic internal components, we can take advantage of these two well-known technologies to provide a robust and innovative product with zero compromises. 

For nearly 50 years, Heat Transfer International (HTI) has developed and operated ceramic heat exchangers in acidic environments at temperatures up to 2,200°F. After multiple iterations, HTI has developed simple and robust designs for use in applications of various pressure and temperature ranges.

The sourcing and manufacture of the ceramic tubes also was an important part of our development.  After working with multiple suppliers, the tubes are now controlled to meet strict specifications, not only in regard to size and shape, but also to material composition and manufacturing process.  The result is a tube that has hardness second only to diamond, while maintaining superb thermal conductivity, abrasion, corrosion, oxidation and thermal shock resistance.

HTI commonly uses silicon-carbide tubes.  SiC has high hardness, strength at temperature and corrosion resistance, and yet silicon-carbide tubing is surprisingly light, has great thermal conductivity, and can safely and dependably operate at process temps up to 2,500°F. 

In addition to the various grades of SiC, there are also alumina and mullite tubes. 

A heat exchanger operates like any other shell and tube heat exchanger.  The placement of gas streams depends on application, as moisture, particulate, gas composition, and system pressure can influence refractory and tube performance.