spray coating 喷涂

water feeder 锅炉给水设备

water treated 锅炉水处理设备

ventilation equipment 锅炉通风设备

safety valve 安全阀

safety relief  valve安全泄放阀

safety device 安全装置

semispherical combustion chamber半球形燃烧室

Glass cotton玻璃棉

made-up water补给水