Selection of condenser tube bank material change
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Could some expert advise me: It is a vertical type switching condenser, with the heat exchange tubes made of 316 material. The upper part of these tubes is 300 mm long, and the material required for the upper tube box is NS312. Some manufacturers design the tube box using Q345R material with NS312 clad on it, while others use an NS312-lined structure for the tube box. Which approach is better? Design parameters: Design pressure of the shell side is 5.45 MPa, and the design pressure of the tube side is 0.25 MPa ； Design temperature: 125°C at the shell side inlet, 205°C at the outlet℃ ； The inlet temperature of the tube side is 270°C, and the outlet temperature is 135°C; boiler water flows in the shell side, while the reaction gas flows in the tube side. Thank you!
The surfacing process is problem-free at temperatures below 350 degrees