Wet hydrogen sulfide heat exchanger, high chloride ion concentration, high temperature, harsh operating conditions
Thread Content
We currently have a shell-and-tube heat exchanger made of 316L material. The fluid flowing inside the tubes is wet hydrogen sulfide gas, with an inlet temperature of 175°C. The fluid on the shell side is cooling circulating water, but its chloride ion concentration is 700PPM. In this case, what temperature should the shell-side circulating water be controlled at to prevent chloride corrosion? What are the requirements for welding manufacturing?
At a chloride ion concentration of 700PPM, for 316L material, what is the temperature below which chloride corrosion does not occur? Are there any experts or materials that can provide an answer?
Chloride corrosion is unavoidable. It’s just a matter of the corrosion rate.
Would it be better if it were made of glass or graphite?
At 175 degrees, the issue of wet hydrogen sulfide should no longer be a concern; it depends on what your outlet temperature is. 316L is likely not suitable for chloride levels of 700PPm; duplex steel could be considered, but its low thermal conductivity requires process optimization.
There should be no problem; it’s sufficient to keep the shell-side water temperature around 30°!