Alkali Metal Corrosion on Refractory Brick Gasifier

Alkali metals (such as sodium, potassium, etc.) can corrode refractory bricks and other refractory materials. This erosion usually involves a chemical reaction between alkali metals and refractory materials, resulting in corrosion and damage to the material. Specifically, the following is the corrosion mechanism of alkali metals on refractory bricks:

Gasification of alkali metals: Alkali metals can react with oxygen in the air to form oxides. These oxides can react with the main components in refractory bricks (usually alumina, silicates, etc.) at high temperatures, causing corrosion of the refractory bricks.

Penetration of Alkali Metals: Alkali metals can penetrate the structure of refractory bricks, especially at high temperatures. Once alkali metals penetrate, they may react with compounds in the brick, causing breakage and dissolution of the material.

Evaporation and recondensation of alkali metals: In the gasifier, evaporation, and recondensation of alkali metals may occur, causing the alkali metals to form salts on or within the refractory bricks. These salts can also corrode the material.

To reduce the corrosion of refractory bricks by alkali metals, some measures are usually required, such as using refractory materials with high alkali metal corrosion resistance, controlling temperature and atmosphere to reduce alkali metal evaporation, and regularly inspecting and replacing damaged refractory bricks. In addition, the selection and maintenance of appropriate refractory materials are also important factors in reducing erosion.