JFU-1桥式除铁装置 废棉处理 Bridged Metal Separator JFU-2除铁杂装置 阻力损失 Resistance loss: ≤100 Pa Heavy Particle Separator 风管直径 Dia.of air duct: 300 mm 阻力损失 Resistance loss: ≤100 Pa 风管直径 Dia.of air duct: 300 mm