“带空气层”楔口珍珠岩预制块代替普通珍珠岩块后,把空气层作为隔热层,导热系数减小,且珍珠岩块的堆积密度也可减小.当保温厚度相同时,热损量减少;或者热损量相同时,保温厚度相应减薄,这样管架的负载可以减轻,对于保温改造具有一定的经济效益. The “air layer” wedge perlite prefabricated block instead of ordinary perlite block, the air layer as a thermal insulation layer, the thermal conductivity decreases, and the bulk density of perlite blocks can also be reduced when the same insulation thickness, heat Reduce the loss; or heat loss the same, the corresponding thinning insulation thickness, so that the load tube rack can be reduced, for thermal insulation transformation has a certain economic benefits.