Structure of the combustion furnace and waste boiler in sulfur recovery units
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Question: What are the structures of the combustion furnace and the waste boiler in a sulfur recovery unit?
A combustion furnace consists of a steel shell lined with refractory materials. Since the maximum combustion temperature in such furnaces can reach 1700°C, high requirements are placed on the refractory materials. Furthermore, the burners of this furnace are rather special, as conditions related to ammonia combustion need to be taken into account; therefore, burners for large sulfur recovery unit furnaces are generally more often imported. Waste heat boilers are generally fire-tube boilers, with flexible tube sheets used. The front tube sheet is protected from heat using castables, and ceramic sleeves are typically employed to prevent boiling at the tube inlets.
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