The top of the heating furnace is the place where the temperature of the heating furnace is high and the airflow is severely scoured. Regardless of the preheating section, heating section, or soaking section, the roof of the heating furnace has different defects from the early refractory brick hanging furnace to the refractory castable furnace roof of previous years. Considering different usage requirements, the refractory materials for the top of the heating furnace can be selected, as well as refractory castables and refractory plastics.
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Application of different refractory materials on the top of the heating furnace
The roof of the heating furnace adopts the hanging roof of refractory bricks, which has poor air-tightness and large heat loss. Due to the uneven surface of the brick, it will increase the airflow resistance and is not conducive to heat radiation, and the heat utilization is low. The overall performance of the refractory brick hanging furnace roof is poor, and the phenomenon of local brick falling is very easy to appear. The high-temperature resistance is poor, and the high-temperature zone of the soaking section is difficult to reach in a year of use.
Based on the above-mentioned shortcomings, now the top of the heating furnace generally uses refractory castables or refractory plastics(http://www.aluminabricks.com/refractory-castable/plastic-refractory/). Although refractory castables overcome many shortcomings of refractory bricks. However, the castable has a serious weakness, that is, its poor thermal shock resistance. The spalling and erosion phenomenon in the heating furnace is more serious, especially the roof of the heating furnace, which sometimes causes large-area laminar shedding. The reason is that the castable itself is poor in thermal shock resistance, and its resistance to rapid cooling and heating is not as good as that of clay bricks. The second reason is that the castable construction is horizontally layered pouring, sometimes due to the failure of the construction equipment or other reasons, the pouring interval is too long. Artificially created laminar gaps and destroyed the overall performance of casting.
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However, the construction method of plastics completely avoids the lack of integrity of refractory castables. The advantage of plastics compared with castables is that it has good thermal shock resistance. This is also an important reason why it is applied to the top of the heating furnace.
Application of Refractory Plastics in the Top of Heating Furnace
1. From the perspective of construction, the construction of refractory plastics(http://www.aluminabricks.com/refractory-castable/plastic-refractory/) is more complicated. From the ramming of the anchoring brick and wood mold to the shaving after removing the mold, piercing the ventilation holes, and anchoring the bottom of the brick with the sleeves until the expansion line is hit. The construction process is complicated, the technical level is high, and the quality requirements of the construction personnel are also high.
2. It is also important to complete the plastic refractory construction to the curing stage before the oven. Since plastics are afraid of water, they cannot be wet from the rain. Be careful to protect the storage before use.
3. Due to the characteristics of the plastics, the shrinkage joints must be processed after the oven. Where the shrinkage seam is large, fill it with plastic to meet the sealing requirements.
The main products of Rongsheng refractory material manufacturers include high alumina bricks, clay bricks, refractory castables, refractory plastics, refractory mortar, and other refractory materials. Rongsheng's refractories have been trusted by customers in more than 60 countries and regions all over the world. If you want to know about the Rongsheng refractory material manufacturer or Rongsheng refractory project, please contact us by email: info@aluminabricks.com. Our team will provide you with services according to your specific needs.
