It is exciting to be part of Sandvik who is steadfast in combining engineering and innovation to meet the challenges of creating sustainable businesses in a dynamic world. Part of this process involves constantly looking for ways to improve efficiency.
High-Temperature Air Preheaters
Many energy intensive industries, including metal, petrochemical, carbon black, glass, and even food processing, involve environments where the temperature ranges from 932°F (500°C) to 2012°F (1,100°C).
To increase thermal efficiency of industrial boiler furnaces, a High-Temperature (HT) air preheater installed in the system recovers waste heat from flue gas (exhaust gas) to preheat process gas. The reduction in fuel consumption lowers cost and gaseous emissions.
Depending on process constraints, the selection of material for high-temperature applications is often a compromise between demands on mechanical strength, structure stability, and corrosion resistance.
Challenges and Benefits
Flue gas composition, extreme heat, or oscillating temperature (i.e. planned/forced outages, natural disasters, emergencies, etc.), can cause premature failure.
Another threat to consider is the possibility of certain metals reacting with oxygen, which leads to surface scale build-up. Eventually, oxidation of the tube or pipe weakens and jeopardizes the integrity of the air preheater.
Furthermore, sufficient creep strength is required to avoid deformation of the tubes at high temperatures.
Choosing the precise material grade delivers:
- Extended product service life
- Optimized performance and reliability
- Reduced operational and maintenance cost
Achieve Longer Service Life
We have an extensive range of alloys and manufacturing capabilities to meet your requirements, along with a team to support your endeavor.
Sandvik 253 MA has proven over many years to be an effective and reliable choice for HT air preheaters. The material's high chromium and low nickel content (11%) contribute to its high creep strength performance, which stainless chromium steels lack and thus incomparable.
Exceptional oxidation properties provide thermal corrosive resistance and prevent material degradation, making it possible to operate the equipment at higher temperatures. The addition of cerium in combination with silicon results in superior oxidation resistance up to 2000°F (1093°C).
By switching tubes manufactured from common carbon steel and 300 series to Sandvik 253 MA in their recuperator, a Brazilian steel mill was able to triple the lifetime of their air preheaters. What would three times longer tube life do for your recuperator efficiency?
Interested in learning more about Sandvik 253 MA? Click here to download the datasheet.
Material selection for a system as demanding as HT air preheaters can be daunting, but it does not have to be. Let me help you find your optimal solution.
Johnnie Nguyen, Product Manager – High Temperature and Fertilizer Portfolio