Seeking advice on equipment resistant to chlorine corrosion
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Our project generates gases containing chlorine and sulfur due to the use of chlorine-containing raw materials in high-temperature roasting; natural gas is used for combustion, which also results in the production of carbon dioxide and water vapor. It enters the quench tower at a temperature of 700 degrees (material: Hastelloy), where water is sprayed to cool it down. As a result, the tower welds suffered severe corrosion and perforation. The swirl plate tower is located behind the quench tower; made of material 2205, the welds suffered corrosion and perforation in less than 12 hours. I would like to ask about the selection of equipment resistant to chlorine corrosion: is a steel-lined graphite structure better, or are there other materials that would work? High temperatures reduce the corrosion resistance of various materials. Is it possible to resolve the corrosion issue when used for heat exchange, or are there additional solutions available?
You should provide the specific composition of the material and the operating temperature, so that others can assist you. As for materials, stainless steel and chlorine are incompatible with each other
The design is completely unreasonable; the flue gas temperature can be reduced to below 260 degrees, making it much easier to handle. Mist spraying for cooling should be used beforehand, and the temperature must not drop below the dew point.
The operating temperature is 700°C, which is reduced to 80°C through cooling by spraying in a quench tower. The main materials are ferric tetraoxide and calcium chloride. A ratio of 100:6, I guess. Through high-temperature calcination at 1150°C.
Is there a better way, to exchange heat first and then process it?