Protection against Corrosion
Acid-Resistant Metallic Heat Exchangers Coated with Borosilicate Glass
Enameled heat exhangers, both plate and tube, are specically designed to handle highly corrosive fluids (acid or water condensate) and to resist corrosion.
Corrosion-resistant borosilicate layers are applied on a metallic substrate (plate or tube), as a proven solution for cold-end protection. The metallic substrate imparts mechanical strength to heat transfer surfaces during operation and water/steam washing. The glass-enameled surface can withstand temperatures between -60 °C and 450 °C and can handle acids and alkalis.
- Resistant to Sulfuric Acid
- High thermal conductivity of carbon steel
- Operating temperature up to 260 °C
(up to 450 °C possible)
- Good resistance to heat cycles and thermal shocks
- Easily replaceable H.T. elements (for tubes)
- Mechanical strength of the metallic substrate (non-breakable)
Glass surfaces in contact with the flowing fluids are extremely smooth, effectively repelling fouling and easily cleanable with water or steam.
Thermal Shock Resistant
Our glass-enameled products are thermal shock tested and approved by third parties. They can resist temperature variations of 400 °C. Contact us for more information and references.
- DeSOx / CCS Gas/Gas Heater
- “Cold-end” Air Preheater
Enameling Furnace of 40 m long
The enameling furnace, longer than 40 meters, is the heart of APEX Group’s enameling process; this process is supported by auxiliary operations such as glass-beads blasting or degreasing. The enameling furnace is placed in a separate building, which ensures low contamination risk for dust particles, supporting the high quality of the glass-enameled products.
A-CORREX Technology for both Plate and Tubular Acid-Resistant Heat Exchangers
1. Enameled Flat Plate Heat Exchangers. Plate Core is free to Expand
The exchanger is built from parallel glass-enameled plates assembled by proprietary methods. The plate-core is free to expand, which prevents cracking of the glass layer during the thermal cycles. The rigid frame consists of panels, protected by Teflon layers or glass-coating in the area in contact with the corrosive gases.
2. Enameled Tubular Heat Exchangers with Special Sealing Method
Glass-enameled metallic tubes offer an alternative design to glass-enameled metallic plates, characterized by the same extraordinary resistance against high differential pressure and temperature shocks during operation. The glass-enameled metallic tubes are placed in a rigid frame. A special sealing method, used for connecting the tubes into the tubesheets, helps to prevent leakage.
The tubes are easy to replace, provide a good resistance against acid corrosion and do not break; they are less fragile compared to glass tubes. The tubes can contain pressurized fluids, e.g. high-pressure steam and water.