I would like to ask about the material selection for hydrogenation catalytic cracking units
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What materials are generally used in hydrocracking units, and what are the allowable ranges for sulfur and chlorine content in the feedstock? Can 347 not be used as an anti-corrosion coating inside catalytic cracking equipment?
The material selection for hydrogenated catalytic cracking units requires taking into account various factors, such as temperature, pressure, chemical composition, corrosivity, and mechanical properties. Generally, hydrogenation catalytic cracking units operate at high pressures, so the materials used must possess corrosion resistance, high strength, and good performance at high temperatures. Common materials for catalytic cracking units include stainless steel, high-alloy steel, tungsten-molybdenum alloys, nickel-based alloys, etc. These materials possess good corrosion resistance and high-temperature strength, meeting the requirements for use in hydrocracking units. As for the control ranges for sulfur and chlorine in the raw material feed, these need to be determined based on the specific production process and product requirements. Generally speaking, the lower the levels of sulfur and chlorine, the higher the quality of the product. 347 is not suitable as an anti-corrosion coating inside catalytic cracking equipment, mainly due to its poor weldability, which leads to the formation of thermal cracks and hydrogen-induced cracks, thereby affecting the service life and safety of the equipment. Therefore, 347 is generally not used as an internal anti-corrosion coating material in catalytic cracking units. .
This post was last edited by qugd on 2023-10-20 at 12:23. It is advisable to consult a design institute or research institution based on the evaluation of the crude oil and its processing conditions. Given the large volume of feed oil and the complex composition in current catalytic cracking units, relying solely on such simple inquiries does not yield any reliable or viable solutions. Another set of catalytic cracking units consists of numerous components such as pipelines, reactors, regenerators, vessels, towers, and heat exchangers – how can it be generalized? 347SS is a niobium-containing stainless steel. Does the OP intend to apply a lining of 347SS to the entire apparatus?