Hot blast stove lining
When the hot blast furnace is working, the lining of the furnace is affected by the sharp change of temperature in the heat exchange process, the chemical erosion of the dust brought into the blast furnace gas, the mechanical load, and the scouring effect of the combustion gas. The main reasons for the damage of the hot blast furnace lining are:
Thermal stress action.
Chemical attack gas and combustion air contain a certain amount of alkaline oxide, and the ash after combustion contains 20% iron oxide, 20% zinc oxide and 10% alkaline oxide, and the vast majority of these substances are discharged out of the furnace, but a small number of components adhere to the surface of the cannon body and penetrate into the cannon brick body. Over time, the brick lining is damaged, cracked, and the strength is reduced.
**10,000 Fans Incentive PlanThe mechanical load action hot blast furnace is a tall structure, and its height is generally between 35 and 50m. The maximum static load of the lower part of the lattice brick of the regenerator is 08MPa, the static load of the lower part of the combustion chamber is also high, under the action of mechanical load and high temperature, the cannon brick shrinks and deforms and cracks, which affects the service life of the hot blast furnace.
The pressure action of the hot blast furnace is periodically burned and supplied with air, and it is in a low-pressure state during the combustion period and a high-pressure state during the air supply period. In the traditional structure of large wall and vault, there is a large space between the vault and the furnace shell, and the packing layer set up by the large wall and the furnace shell also leaves a certain space after shrinking and natural compaction under the action of long-term high temperature. Due to the existence of these spaces, under the pressure of high-pressure gas, the cannon bears a large outward thrust, which is easy to cause masonry tilting, cracking and loosening, and then the space outside the masonry is periodically filled and relieved through the brick joints, thereby aggravating the damage to the masonry.