根据热力学的观点,普通石英砂明冒口的上端散热,以辐射散热为主,约占冒口全部散热量的40％,冒口的侧壁散热,以传导散热为主,热损失占60％。为减少冒口侧壁的热损失,可以用具有良好保温性能、导热损失小的材料制成保温套,即保温冒口;冒口上部的辐射散热可通过在冒口上端面覆盖高效膨胀防缩剂来减缓。这种保温套加膨胀防缩剂的冒口,通常称为“复 According to the thermodynamic point of view, ordinary quartz sand risers on the top of the heat, radiation heat-based, accounting for about 40% of the total riser risers, risers on the side of the heat, heat conduction to conduction, heat loss accounted for 60% . In order to reduce the heat loss on the riser’s side wall, a thermal insulation sleeve can be made of a material with good thermal insulation performance and low thermal conductivity loss, that is, a thermal riser; the radiant heat dissipation at the upper part of the riser can be covered by an efficient expansion shrinkage inhibitor To slow down. This insulation sleeve plus anti-shrink agent riser, commonly known as "complex