What are the pipes on the surface of the closed box of blast furnace? The airtight box is made by Sinosteel Xi 'an Heavy Machinery Co., Ltd.! Better give a schematic!

There are three kinds of pipes on the surface of airtight box. The first nitrogen pipe, about 50mm in diameter, is mainly used for cooling and sealing inside the closed box. The pressure of nitrogen entering from the outside is about 10kpa higher than that of the top of the furnace, which ensures that the dust on the top of the furnace cannot enter the closed box, and at the same time, it can take away some heat during the nitrogen circulation. For the second cooling water pipe, the hollow position inside the closed box is directly communicated with the blast furnace, and there is a central throat inside. The cooling water flowing out from the outside of the central throat is equipped with a snake-shaped water pipe, which takes away the heat of the central throat. The flow rate of water-cooled closed water in Xiye is not easy to exceed 16 cubic meter/hour. The third lubrication pipeline is 6mm copper pipe, which is lubricated by planetary reducer.