莱芜钢铁集团股份有限公司炼铁厂 (简称莱钢炼铁厂 ) 4× 1 2 0 m3 高炉所用风口小套原来全部外购。风口装置是高炉送风系统的关键设备 ,风口小套工作环境恶劣 ,且因其结构设计和制造工艺不合理 ,随着高炉冶炼强度的提高 ,故障率上升 ,使用寿命低 ,影响了高炉的生铁产量 ,风口 Laiwu Iron and Steel Group Iron and Steel Co., Ltd. Iron Works (hereinafter referred to as Laiwu Iron and Steel Works) 4 × 1 2 0 m3 Blast furnace used a small set of all the original outsourcing. The tuyere device is the key equipment of the blast furnace air supply system. The tuyere sleeve has poor working environment. Due to the unreasonable structural design and manufacturing process, as the blast furnace smelting strength increases, the failure rate increases and the service life is low, affecting the blast furnace pig iron Output, tuyere