50% lye primary heat exchanger Approximately 165°C in the solid caustic soda evaporation industry

The 50% lye primary heat exchanger is a crucial component in high-temperature sections, requiring not only high-temperature and high-pressure resistance—with temperatures reaching approximately 165°C and pressures around 0.8 MPa—but also the ability to resist stress corrosion across a wide temperature gradient. Our heat exchanger is designed with both the inner and outer tubes made of nickel, utilizing a four-stage heat exchange technology. This design not only meets the stringent demands of high-temperature operations but also ensures the safe and stable performance of the evaporation unit.

Key Features:

• First Stage: The initial stage of the heat exchanger is designed to absorb heat in regions with large temperature gradients. It employs a double-tube, double-shell configuration, with a shell and tube wall thickness of 2.0 mm. The tube plate is strength-welded for added durability.

• Second to Fourth Stages: These stages are focused on absorbing heat in areas with smaller temperature gradients. A single-flow heat exchanger is used here, with a tube wall thickness of 1.2 mm, employing a manufacturing process of initial expansion followed by welding.

The output from the evaporation unit has a mass fraction of 48.5%, with the output temperature at 158°C. After passing through the heat exchanger, the temperature drops to around 115°C. Our mixed-process shell and tube heat exchanger has been operating seamlessly for over 5 years, with no instances of liquid leakage during this period.

Specifications of the 50% Lye Primary Heat Exchanger

• Material: Nickel for both inner and outer tubes.
• Operating Temperature: Approximately 165°C.
• Operating Pressure: Approximately 0.8 MPa.
• Heat Exchange Technology: Four-stage heat exchange.
• First Stage: Double-tube and double-shell heat exchanger with 2.0 mm wall thickness.
• Second to Fourth Stages: Single-flow heat exchanger with 1.2 mm wall thickness.
• Manufacturing Process: Initial expansion followed by welding.
• Output: Mass fraction of 48.5%, with an output temperature of 158°C, reduced to approximately 115°C after heat exchange.
• Operational Lifespan: Over 5 years without any liquid leakage.

Role in Caustic Soda Evaporation

The 50% lye primary heat exchanger plays a vital role in the solid caustic soda evaporation industry, facilitating the transfer of heat between fluids to concentrate the caustic soda solution. Designed to function under high temperatures and pressures, it is constructed from materials capable of withstanding the corrosive nature of the caustic soda solution.

In this specific case, nickel is chosen for the inner and outer tubes due to its excellent resistance to corrosion and high-temperature performance. The four-stage heat exchange technology allows efficient heat transfer, even in environments with varying temperature gradients.

The first stage efficiently absorbs heat in regions with significant temperature differences, using a double-tube and double-shell heat exchanger with a 2.0 mm wall thickness. The subsequent stages handle areas with smaller gradients using a single-flow heat exchanger with a 1.2 mm wall thickness.

The 50% lye primary heat exchanger is primarily used in industries that require high-temperature and high-pressure operations, particularly those involving caustic solutions. Key industries include:

1. Chemical Manufacturing: Specifically in the production of caustic soda (sodium hydroxide), where heat exchangers are used in the evaporation process to concentrate the lye solution.

2. Petrochemical Industry: For processes that involve the handling of corrosive fluids at high temperatures, such as in the production of various chemicals and intermediates.

3. Pulp and Paper Industry: In the causticizing process where lye is used in the treatment and recovery of chemicals used in pulp processing.

4. Textile Industry: For the processing and treatment of fabrics, where caustic soda is used in mercerization, a treatment process to improve dye uptake and fabric strength.

5. Food and Beverage Industry: In processes where caustic solutions are used for cleaning and processing equipment, requiring robust and corrosion-resistant heat exchangers.

6. Pharmaceutical Industry: Where caustic solutions are used in various cleaning and synthesis processes, necessitating equipment that can handle high temperature and pressure.

These industries rely on such heat exchangers for efficient, safe, and reliable thermal management in their processes.

In summary, the 50% lye primary heat exchanger is well-engineered to meet the demands of the solid caustic soda evaporation industry. Its design and material choices ensure efficient heat transfer and resistance to stress corrosion, with proven reliability in over five years of operation without any incidents of liquid leakage.