Glass lined heat exchangers Back


Thaletec GmbH


THALETEC heat exchangers are not only extremely efficient, but also absolutely resistant. The company produces glass lined heat exchanger tubes for chemical plants, flue gas desulphurization systems, for heat exchangers in power plants and industrial combustion plants. The production is unique worldwide.
Glass lined tubes are submitted to an automatic electrostatic powder coating process in a production line with a length of more than 60 m. The freedom from pores and layer thickness of the glass surface are continuously monitored by highly sensitive sensors.
·         Our glass lined compact heat exchanger in WTU design with gasket-free - and thus GMP-compliant joints has been optimized for good thermal transfer on the basis of bundles of heat exchanger tubes.
·         A new component in our product range is the SiC (Silicon carbide) heat exchanger, which even withstands the influence of corrosive products on both sides.
WTU heat exchangers:
Glass-lined heat exchangers are very well suited as vaporisers, condensers and for liquid/liquid heat exchange applications. New technical features – such as the reduced layer thicknesses and connections without seals between tube plates and tube ends – provide the opportunity to use this kind of heat exchanger as an element in a glass-lined system.
The glass lined U-tubes are fixed in the glass lined tube base without gaskets. This connection method reliably satisfies the requirements for GMP-compliant design. Product residues and impacts on the product arebasically excluded due to the very concept.
This gasket-free connection between the tubes and the tube base is gas-tightand leakage-proof and satisfies even thehighest demands on pressure resistance.
Due to the relatively low thermal conductivity of glass, the U-tubes are coated with a layer thickness of 0.6 – 0.8 mm, and the glass coat is applied by an electrostatic process.
The process results in a homogeneous material structure with extremely low variation concerning the glass layer thickness. This ensures an even heat distribution and prevents thermal stress peaks in the glass layer.
Due to their precision lining, the glass lined U-tube bundle heat exchangers made by THALETEC are capable of achieving a heat transfer coefficient of up to 800 W/m2K.
Glass lined tube bundle heat exchangers are preferably used for condensation, evaporation and liquid-liquid heat exchange. The heat exchangers can be placed vertically and horizontally.
The standard operating pressure for THALETEC glass lined heat exchangers is -1 to +16 bars with operating temperature of -60 to 220°C.
All glass lined heat exchangers are subjected to a helium leakage test to verify their tightness. According to our experience, values ranging between 10-5 and 10-6 bar are reached. At the same time, the static friction between the tube and the tube base amounts to up to 20,000 N. The glass lined tubes can be strained up to their apparent yield point. As a result, they offer high operational reliability and protection against product contamination.
Silicon carbide (SiC) heat exchangers:
As an alternate to glass lined tubes, THALETEC offers the option of silicon carbide tubes. With the SIC-tubes in a THALETEC heat exchanger, two corrosive fluids can be used in one heat exchanger – one fluid on the shell side and the other on the tube side. The SIC compound heat exchangers close the gap between corrosive exposure on one side and on all sides.
Thus, known excellent corrosion properties of glass are combined with the equally high corrosion resistance of silicon carbide and its excellent thermal conductivity in these applications.
In contrast to the gasket-free concept of the glass lined U-tube bundle heat exchanger, the SIC-tubes are sealed using two highly resistant O-rings made of perfluor elastomer material. The tube ends have been precision machined in the area of the tube base, and have been provided with grooves taking up the O-rings.
In contrast to its competitors, THALETEC uses thick-walled SIC-tubes with a large cross-section. The thick-walled SIC-tubes offer higher mechanical stability and increased protection against damages to the tubes during cleaning processes. In addition, the large cross-section ensures cleaning ease and the operation of the heat exchanger with low pressure loss.
The thermal conductivity of silicon carbide amounts to approx. 160 W/m2K, thus exceeding all comparable materials used in corrosive applications. Using the THALETEC compact heat exchangers, you can achieve heat transfer coefficients of up to 1,400 W/m2K.
In standard design, the glass lined compact heat exchangers with SIC-tubes are rated for operating pressure of -1/+6 bar on the tube and jacket side. The permitted operating temperature of the standard component is -10 to 200°C.