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How do I prevent the cooling water from boiling?

Q: I am designing a syngas cooler. The gas is at 400 deg C, and I want to prevent boiling of the cooling water, but still maintain a low pressure drop across the cooling water side. Do you have any hints for me?

A: I would suggest providing sufficient velocity to maintain the water side wall temperature below about 60-70 °C.  Typically this type of an application would be generating steam from properly treated boiler feed water.

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