High-thermal-shock-resistance coating for wind chamber of circulating fluidized bed boiler (CFBB) and production process of coating

Abstract

The invention discloses a high-thermal-shock-resistance coating for a wind chamber of a circulating fluidized bed boiler (CFBB) and a production process of the coating, belonging to the field of monolithic refractories, and specifically relate to a high-thermal-shock-resistance coating for a wind chamber of a circulating fluidized bed boiler (CFBB) and a preparation method of the coating. The technical scheme for preparing the high-thermal-shock-resistance coating disclosed by the invention is implemented by taking waste silicon carbide plate particles, waste fused silica stick particles and waste clay brick particles as particle materials, taking 60 high-alumina bauxite fine-powder and clay fine-powder are taken as matrix materials, and introducing a composite inorganic binder and a curing agent through the steps of material selection, accurate weighing, material aging, mud material mixing, and the like. Compared with a traditional lining material for a wind chamber of a CFBB, the thermal shock resistance of the high-thermal-shock-resistance coating is significantly increased, and the service life is significantly prolonged.

Description

technical field [0001] The invention belongs to the field of unshaped refractory materials, and in particular relates to a high thermal shock resistance smear material for a circulating fluidized bed boiler air chamber and a production process thereof. Background technique [0002] The high thermal shock resistance smear material involved in the present invention is a refractory lining material used in the top and side walls of the air chamber of the circulating fluidized bed boiler in the thermoelectric industry, and plays the role of isolating the flame and preventing the oxidation of metal parts such as steam pipelines. . During the ignition process, the temperature in the air chamber rises from normal temperature to 1200°C. After ignition, the temperature in the air chamber drops from 1200°C to normal temperature. During the heating and cooling process, due to the temperature difference between the inside and the outside, thermal stress occurs inside the refractory linin...

AI Technical Summary

Problems solved by technology

[0005] Thermal shock resistance is the key performance index of refractory lining materials for air chambers. Hard clay clinker and high-alumina bauxite have large thermal expansion coefficients, resulting in large overall thermal expansion coefficients of lining materials, which are unfavorable for thermal shock resistance; high-alumina cement , calcined alumina micropowder, and silica micropowder, the traditional lining material has the characteristics of high density and high strength, but strong rigidity and poor toughness, resulting in poor thermal shock resistance

The refractory lining material used in the traditional air chamber is used in the air chamber of the circulating fluidized bed boiler that is often ignited and shut down, and often peels off, which affects the normal operation of the circulating fluidized bed boiler

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