Working liner for protecting front arch of boiler, and preparation method thereof

Abstract

The invention discloses a working liner for protecting the front arch of a boiler, and a preparation method thereof. The working liner can effectively prevent ablation and fracture of the front arch of the boiler, and prolongs the service life of the boiler. The liner comprises 25-35wt% of SiO2 with the granularity of 20-100[mu]m, 20-40wt% of Al2O3 with the granularity of 0.5-1.5mm, 10-30wt% of Al2O3 with the granularity of 20-100[mu]m, 15-35wt% of MgO with the granularity of 0.5-1.5mm, and 1-10wt% of sodium fluorosilicate with the granularity of 100-300[mu]m. Coarse and fine particles in the above mixed materials are uniformly matched, and the coagulating agent sodium fluorosilicate is matched, so the linear has large density, and can be firmly combined with a base material. The liner of the front arch of the boiler, smeared on the front ach, can be sintered by using the temperature in the boiler, a liner layer has very firm combination force with the base material of the front arch, and the surface of the liner layer is very smooth, resists high temperature, and is not prone to crack or shed.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a working lining for protecting the front arch of a boiler and a preparation method thereof. Background technique [0002] Boilers are important heat supply equipment in the national economy. With the development of the times, the use of boilers has been widely used in electric power, machinery, metallurgy, chemical industry, textile, papermaking, food and other industries. Today's industrial and civil heating requires boilers to supply a large amount of heat energy. From the perspective of energy utilization, the boiler is a kind of energy conversion equipment. In the boiler, the chemical storage energy of coal is converted into the heat energy of the combustion products needed by people through the combustion process, and then the heat is transferred to the intermediate heat carrier through the heat transfer process. Bodies such as water and steam rely on it to tr...

AI Technical Summary

Problems solved by technology

The front arch brick of the boiler is made of high-quality high-alumina clay after billet drying and high-temperature firing. When the boiler is not working, the temperature of the front arch will drop to about 200 degrees, and the temperature of the front arch will rise to more than 1200 degrees when the boiler is working. At the same time, it must bear the vibration of the boiler transmission part, so the surface of the front arch will be partially damaged and ablated after being used for half a year to one year, which will affect the combustion of coal. In severe cases, the front arch will collapse and affect the normal operation of the entire boiler