Pouring material for furnace wall built-in channel heat-accumulating type heating furnace

Abstract

The invention discloses a pouring material for a furnace wall internal regenerative heating furnace with 65-95 percent of high alumina bauxite, 1-10 percent of alumina powder, 1-10 percent of silica ultrafine powder and 0.5-15 percent of cement as raw materials by weight percentage as well as sodium polyphosphate being 0.01-0.3 percent of the total weight of the raw materials. The product of the invention has excellent performance with refractoriness under load T0.6 equal to or more than 1500 DEG C, 1350 DEG C multiplied by 1h high temperature break resistant intensity equal to or more than 3MPa and heat-shake stability more than 40 times under 1100 DEG C and cool water condition. The invention adds active rho-alumina in the Al2O3.SiO2 system refractories, therefore, in-situ reaction can happen under comparatively low temperature to form lots of column mullite, thus leading the pouring material to have the characteristics of high soft load capacity, high hot strength and excellent heat-shake stability, etc. and prolonging more than 2 times of service life compared with that of low cement pouring material.

Description

Castable for regenerative heating furnace with built-in channel in furnace wall 1. Technical field: The invention relates to a refractory material, in particular to a castable for a regenerative heating furnace with a built-in channel in the furnace wall. 2. Background technology: The product of the invention is mainly used in the built-in channel type heating furnace adopting the high-efficiency regenerative combustion technology which organically combines the regenerator and the furnace body. There are multiple regenerators, gas and combustion air passages inside the furnace wall of this heating furnace. The structure is complex and the furnace wall cannot be repaired if there is a problem, so the requirements for refractory materials are very high. Most of the castables for heating furnaces are high-alumina and low-cement castable products, which can meet the needs of general heating furnaces for furnace body refractory materials, but cannot meet the requirements of th...

AI Technical Summary

Problems solved by technology

There are multiple regenerators and gas and combustion air channels inside the furnace wall of this heating furnace. The structure is complex and the furnace wall cannot be repaired if there is a problem, so the requirements for refractory materials are very high.

Most of the castables for heating furnaces are high-alumina and low-cement castable products, which can meet the needs of general heating furnaces for furnace body refractory materials, but cannot meet the requirements of this type of heating furnace.

The reason is that the previous low-cement castables are limited by the bonding system, and they generate low-melting materials such as anorthite and calcium-aluminum feldspar at high temperatures, thereby reducing their load softening temperature and high-temperature strength. The reference performance index is: load softening Temperature T0.6: 1300~1350℃, 1350℃×1h high temperature flexural strength: 0.5~1MPa, under the condition of [1100℃-water cooling], the thermal shock stability is 20~25 times

However, the regenerative heating furnace with built-in channels in the furnace wall (made of refractory castables) requires refractory castables to have high load softening temperature, small change in reburning line, high thermal flexural strength and excellent high-temperature volume stability. Previous products cannot meet the performance requirements