Wear-resistant Refractory Castables for Petrochemical Industry

High-strength wear-resistant linings

High-strength wear-resistant linings are suitable for the wear-resistant layers of reactors, regenerators, primary vortex, secondary vortex, tertiary vortex, dilute phase pipes, lifting inclined pipes, and feed legs in the catalytic cracking unit of oil refining equipment. They are also suitable for special-shaped structural parts and devices that are not suitable for laying tortoise shell mesh, such as distribution pipes and distribution plates.

 

The operating temperature of the catalytic cracking unit in the high-temperature heat extraction furnace of raw flue gas reaches about 1300℃. With the widespread adoption of catalytic cracking technology. The operating temperature of the two devices (reactor and regenerator) continues to increase, and the hardness of the catalyst is getting higher and higher, which puts higher requirements on the amorphous refractory castables used for linings.

At present, in the construction of refractory castables for lining of catalytic cracking units, a variety of new heat-insulating and wear-resistant lining composite materials are applied, which can be summarized into five categories: the first category is high wear-resistant materials, which are mainly used for cyclone separators and equipment with similar working conditions; the second category is wear-resistant materials, which are mainly used for double-layer lining wear-resistant layers; the third category is heat-insulating and wear-resistant materials, which are mainly used for single-layer lining or insulation layers of the shells and pipelines of catalytic cracking units; the fourth category is insulation materials, which are mainly used for the insulation layers of the shells and pipelines of catalytic cracking units; the fifth category is high thermal resistance products, which are mainly used for the insulation layers of double-layer linings with general wear requirements. The classification of lining materials is divided according to performance indicators. Due to the different formulations of various materials, the construction requirements are also different.

The application standard of refractory castables in the petrochemical industry should be SH3531-2003 "Technical Specifications for Heat-Insulating and Wear-Resistant Linings". The requirements for the chemical composition and physical properties of steel fibers have been newly added to the technical specifications. For details, see SH3531-2003 and the requirements for the Fe2O3 and AL2O3 content and wear resistance of lining materials. In the "Technical Specifications for Heat-Insulating and Wear-Resistant Linings", except for AA materials that use phosphate as a binder, other materials use aluminate cement as a binder.

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