Enameled Elements
The Howden enameling processes produce an element with the optimum combination of corrosion protection and cleanability. Enameled elements are used in the rigorous environments experienced in the low temperature, cold end layers of air preheaters, and in the even more aggressive regimes found in FGD gas-gas heaters and air preheaters located after SCR DeNOx installations.
Elements for gas-gas heaters have enamel coatings specifically developed to have low porosity, high acid resistance, and good edge coverage.
Enamel for air preheaters installed downstream of SCR
plants have enamel coatings with good compression and cleanability properties.
Our many years of operating experience has shown that corrosion occurs in enameled elements as a result of a combination of factors, including enamel porosity, enamel cracking, incomplete edge coverage and poor acid resistance. To ensure the maximum element life, our enameling processes which are specifically developed for rotary regenerative heating elements, provide:
- Fine coating thickness tolerance (permitting thinner coatings and higher element packing pressure)
- Lower porosity as a result of fewer additives in the frit powder
- Smoother enamel surface
- No large enamel accumulations near the edges
- Superior edge coverage