第40章 钢铁工业

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切割的钢板、钢筋和机械零件按类别堆放。碳钢、不锈钢、铸铁和合金钢之间留有明显间隔,来源不明的材料单独放在待检区。
    一名年轻干部看着堆积如山的废钢,“这些原来都是钢,熔了以后还要检测成分?”
    “当然”周启衡从料堆旁捡起一截弹簧,又指向旁边的建筑钢筋。“这两样看着都一样,实际上内部的含碳量差的不少。全部混成一炉,炼出来的钢每次都可能变样。”
    他带着众人回到炉体施工区,在一块白板上画出电弧炉的截面。
    “装料时,炉底先铺一层合适的缓冲材料,再放较大的重料,最上面布置轻薄料。装料顺序要兼顾炉衬保护、炉料稳定和电极起弧。大块的废钢若悬在上面,熔化过程中突然塌落,容易损伤炉衬和电极。”
    一名施工人员正好从旁边搬过两块耐火砖。
    周启衡拿起其中一块,递给众人看,“炉壳是钢制的,里面还要砌耐火层。钢水温度超过一千六某度,光靠外面的钢板撑不住。耐火材料一旦侵蚀严重,必须停工修补。”
    (本章未完,请点击下一页继续阅读)第40章钢铁工业(第2/2页)
    “炉料熔化以后,接下来做什么?”有人问。
    “取样、测温、调整成分。”
    周启衡在白板上依次写下碳、硫、磷几个字。
    “需要脱碳时可以吹氧,加入石灰等造渣材料,让部分杂质进入炉渣。根据最终用途,再补加合金。成分和温度合格后,炉体倾转,钢水流进预热过的钢包。”
    他在炉体旁画了一只钢包,又画出通向浇注区的箭头。
    “钢包送到后面,浇成钢锭或方坯。坯料经过检验,再交给轧钢、锻造和机械加工单位。炉子出钢只完成了前半程,后面还有一长串工序。”
    一名工作人员看着白板问道:“电弧炉和高炉有什么区别?”
    周启衡换了一支红色记号笔,在白板另一侧画出矿山、高炉和转炉。
    “高炉要从铁矿石出发。铁矿要先开采、选矿,还要烧结或制成球团;煤炭要经过焦化;冶炼过程中还需要制氧、运输和一整套辅助系统。高炉连续生产铁水,再送进转炉炼钢。体系建成以后,产量大,生产稳定,价格更加低廉。”
    他又在电弧炉图案下面画了一堆废钢。
    “电弧炉适合直接利用废钢,建设周期较短。我们眼下拥有大量城市钢材存量,也有机械、电气、自动化和冶金人员,短期内从这条路线切入更实际。”
    说话间,厂房外传来一声吊车鸣笛。施工人员开始吊装电极升降机构。几名来自不同企业的工程师围着图纸核对尺寸,其中一人很快发现液压管接口对不上。
    “这个法兰是另一套标准。”
    “库存里有没有转换接头?”
    “没有现成的。”
    “送机加中心,图纸也一并送过去。”
    何峥听完,向参观人员解释:“很多设备来自不同的厂家,有些还是从闲置生产线拆下来的。接口、控制程序和液压系统都要重新匹配。”
    旁边一名自动化工程师抱着笔记本电脑走过来。
    “原系统有几个子模块依赖厂商的远程授权服务器,现在连接不上。我们先把核心控制功能拆出来,改成本地独立运行。能保留的自动化功能尽量保留,无法长期维护的部分增加手动操作方案。”
    “手动操作会不会影响效率?”
    工程师答道:“会降低一些效率,但总比哪天授权程序失效,整套设备趴窝强。”
    厂房西侧,循环冷却水池正在浇筑。
    电弧炉炉盖、炉壁水冷构件和部分供电设备都需要稳定冷却。冷却系统发生故障时,炉子必须迅速停下来,因此水泵、管道和备用电源都按照重要设备配置。
    除尘设施位于更远处。几根粗大的烟气管道已经运到现场,等待与炉盖排烟口连接。布袋除尘器的箱体尚未组装,只在地面摆出一排钢结构框架。
    负责职业健康的专家停在框架旁。
    “炉子点起来以后,装料、熔化、造渣和出钢都会产生烟尘。废钢里还可能带着油漆、镀层和残留的杂质,烟气成分更复杂。因此沉降设施和布袋除尘必须同步投用。”
    参观接近尾声时,各专业组在临时会议桌旁汇报剩余问题。
    一位习安理工大学研究耐火材料的教授首先开口。
    现有炉衬砖、捣打料和钢包耐材能够满足试生产和初期运行。随着开炉次数增加,炉衬和钢包内衬会持续消耗。后续必须寻找镁砂、石灰石、耐火黏土等原料,并恢复相应生产能力。
    同时石墨电极的库存可以维持一段时间,但长期高负荷生产仍然缺乏保障。科研团队正在研究优化供电制度、减少电极氧化消耗,并回收每次更换后留下的残余电极。
    除这些问题外,清单上还列着氧气供应、检测
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