High-alumina high-temperature refractory castable for power station boiler

Abstract

The invention discloses a high-alumina high-temperature refractory castable for a power station boiler, which is prepared from the following components in parts by weight: 60-80 parts of high-alumina aggregate, 5-12 parts of special-grade kaolin, 5-12 parts of binder, 2-8 parts of silicon micro-powder, 2-10 parts of alumina micro-powder and 1-5 parts of water, wherein in the 60-80 parts of high-aluminum aggregate, coarse aggregate accounts for 30-40%, medium aggregate accounts for 35-45%, and fine aggregate accounts for 20-30%; the binder is prepared from the following components in parts by weight: 20-40 parts of magnesium silicate and 80-60 parts of phosphate. The high-alumina high-temperature refractory castable disclosed by the invention has the beneficial effects that the boiler box temperature can be increased by 60-250 DEG C, the thermal efficiency can be improved to 8%, and the service life of the boiler body is prolonged.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a high-aluminum high-temperature refractory castable for power plant boilers. Background technique [0002] Compared with qualitative refractory products, unshaped refractory materials represented by refractory castables have the advantages of short process flow, low production energy consumption and cost, convenient use, wide application range, integrity and good use effect, so they are widely used in the world. It has developed rapidly, and its proportion in the whole refractory material is getting higher and higher. In some countries with advanced refractory technology, the output of unshaped refractories has approached or even exceeded the output of shaped products. For example, the current output of unshaped refractory materials in Japan accounts for about 60% of the total refractory materials; in the United States, it is about 50%; in Britain, Germ...

AI Technical Summary

Problems solved by technology

[0004] However, the aluminum oxide content of the existing high-alumina monolithic refractory materials is generally below 60%, and its high temperature resistance, wear resistance, and shock resistance are slightly insufficient. Composite properties of refractory materials, product structure compactness and corrosion resistance are poor, and hardening and condensation are slow

Now, the high-temperature zone of various medium and high-temperature furnaces or the inner wall of the combustion chamber (refractory wall and metal surface) of various medium and high-temperature furnaces that use coal, electricity, oil, and gas as energy sources need to be integrally cast, thickened, and Pasting and repairing, especially the pouring, repairing and roof sealing of the steel rolling furnace wall in the metallurgical industry and the transformation of the furnace combustion belt of the thermoelectric boiler in the thermal power industry, the wear resistance around the burner and the wear resistance of the flue wall, and the furnace roof sealing. It is difficult for a single high-alumina monolithic refractory material to achieve the functions of wear resistance, high temperature resistance, earthquake resistance, energy saving and consumption reduction