According to the above problems, the idea of slag hanging on the furnace wall and heat preservation of the furnace bottom is proposed. Furnace wall slag: In the barrel part of the heat preservation furnace, a certain temperature gradient is formed from the inner wall of the furnace lining to the water jacket interlayer of the furnace shell. This temperature gradient forms a layer of slag protection layer on the inner wall of the furnace lining, which effectively protects the furnace lining. Bottom insulation: Since the bottom lining of the holding furnace is always covered by a slag layer, the probability and degree of damage is much lower than that of the side walls, and it is also considered to minimize the loss of heat energy. Therefore, the bottom lining of the holding furnace only needs to ensure that no leakage occurs.
Implementation plan
The cooling water flowing through the water jacket acts as a carrier to take away the heat energy from the furnace lining. The carbon brick has the advantages of high temperature resistance and good thermal conductivity, but has poor oxidation resistance; the main component of the clay brick is silica, which is an acidic refractory material, which is resistant to oxidation. Strong ability and almost no chemical reaction with hot slag but weak high temperature resistance and poor thermal conductivity.
The ideal state is: when the hot slag liquid fills the holding furnace, a layer of slag protection layer is formed on the inner wall of the lining clay brick, and the appropriate temperature gradient keeps the slag layer at a certain thickness to protect the furnace lining. The role of clay bricks in the furnace lining is a sacrificial layer. Even if a good slag protection layer is not formed on the clay brick layer, the furnace lining can have a certain service life due to its oxidation resistance and non-reaction with hot slag. Expect. When the clay brick layer is consumed to a certain extent, it can be replaced with new bricks.
The bottom lining of the holding furnace is always covered with a slag layer, and the carbon bricks are not oxidized and have excellent thermal stability in the absence of oxygen. Below the carbon bricks are high-alumina bricks. The high-alumina bricks have the characteristics of high temperature resistance and good heat preservation, which can ensure that there will be no leakage at the bottom of the furnace and that the bottom lining will not dissipate too much heat.
The materials used for bonding between different materials are different. High-alumina castables are used between the steel shell at the bottom of the holding furnace and the high-alumina bricks; carbon ramming materials are used between the steel shell of the holding furnace and the carbon bricks; carbon-based ramming materials are used between the carbon bricks and the clay bricks to ensure that Good heat transfer performance and thermal insulation performance were obtained, respectively.
