Nickel double-pipe heat exchanger

Nickel double-pipe heat exchanger

Pure nickel N4 can be used in a double-pipe heat exchanger to evaporate solid caustic soda. Caustic soda (sodium hydroxide) is a highly corrosive substance and therefore requires a material with excellent corrosion resistance. N4 is known for its excellent corrosion resistance, making it suitable for use in applications involving caustic soda.

In a double-pipe heat exchanger, the pure nickel N4 tube can be used to transfer heat to the caustic soda solution, causing it to evaporate. The heat transfer fluid (such as steam or hot water) flows through the outer pipe, while the caustic soda solution flows through the inner pipe. The N4 tube acts as a barrier between the two fluids, preventing any contamination or mixing of the fluids.

It is important to note that caustic soda can cause stress corrosion cracking in some materials, so it is crucial to select the appropriate material for the application. Pure nickel N4 is resistant to stress corrosion cracking and can provide a reliable and long-lasting solution for solid caustic soda evaporation in a double-pipe heat exchanger.

Specification of nickel double-pipe heat exchanger

The specifications for a nickel double-pipe heat exchanger will depend on several factors, including the application requirements, operating conditions, and the properties of the processed fluids. Here are some general specifications that can be considered when designing a nickel double-pipe heat exchanger:

Tube size and wall thickness: The size and wall thickness of the nickel tube will depend on the flow rate, pressure, and temperature of the fluids being processed. Generally, larger diameter tubes are used for higher flow rates, while thicker walls are used for higher pressures.

Tube length: The length of the tube will depend on the heat transfer requirements of the application. Longer tubes can provide greater heat transfer surface area, but may also increase pressure drop and require larger equipment.

Tube arrangement: The tubes can be arranged in a single-pass or multi-pass configuration depending on the specific heat transfer requirements of the application.

Heat transfer surface area: The surface area of the nickel tube will depend on the amount of heat that needs to be transferred between the fluids. Generally, a larger surface area will result in greater heat transfer.

Corrosion allowance: A corrosion allowance should be included in the design to account for potential corrosion over the service life of the heat exchanger.

Ni-Double pipe heat exchangers final assembly

Ni-Double pipe heat exchangers made from pure nickel N4 are commonly used in the solid caustic soda evaporation industry for their excellent resistance to corrosion by caustic alkalis, including sodium hydroxide (NaOH), which is the primary component of solid caustic soda.

In the final assembly of a Ni-Double pipe heat exchanger made from pure nickel N4, the nickel pipes are typically welded to nickel tube sheets, which are then mounted in a protective shell. The double pipe design consists of an inner pipe, through which the hot or cold fluid is passed, and an outer pipe, through which the opposing fluid is circulated.

The use of N4 ensures that the heat exchanger can withstand the corrosive effects of the caustic soda, which can cause damage to other materials over time. Additionally, using a double pipe design helps to increase the efficiency of the heat exchanger, as it allows for a greater surface area for heat transfer.

Overall, the final assembly of a Ni-Double pipe heat exchanger made from N4 is critical to ensuring the longevity and reliability of the equipment in the solid caustic soda evaporation industry.