P0916CQ

P0916CQ

P0916CQ

P0916CQ

由矿石到钢材的生产有多种流程，但主要是下列两种流程 [1]：烧结球团和焦化-高炉-转炉-轧机流程、直接还原或熔融还原-电炉-轧机流程。前者被称为长流程（见图1，是目前的主流程），后者则被称为短流程。

《联系人；欧先生》

《座机：0592-5709825》

《传真：0592-5917519》

《24小时热线：18030229053同步》

《  ：2479261344》

《邮箱：2479261344@.com》两者都是由一系列分厂或车间组成的钢铁总厂，前者一般分为原料场，烧结、球团、焦化（或炼焦、化工）、炼铁、炼钢（含铁水预处理、转炉、炉外精炼、连续铸钢）和各类轧钢（钢管、热轧带钢、冷轧板带、线棒材、型钢、轨梁、中厚板等）等分厂；此外还有一些辅助分厂，如动力部（包括发电、供电、煤气、氧气、给水等分厂）。选矿厂一般在矿山附近（一般与采矿合为矿山公司），只有矿山较近时才设在钢铁厂内。后者没有烧结、球团、焦化分厂（图1 中直接还原以下的流程）。 

      钢铁企业使用的电动机有直流电动机和交流电动机，由于有许多要求调速的生产机械对电气控制系统有一定的要求，如调速范围、动态响应、静差度等，过去由于交流电动机控制系统不能满足这些要求，因此直流电动机一直占主导地位，但直流电动机有一系列缺点，如结构上有换向器及电刷使日常维护量增加、电刷与整流子经常产生火花而要求较好的安装环境及不能用于易燃易爆和环境恶劣的场所、与同容量交流电动机比体积和重量及转动惯量都较大价格也较高、效率低比交流电动机低2~3%等，而交流电动机近十多年随着电力电子技术、微电子技术发展和现代控制理论应用，使交流调速迅速发展，它克服了直流电动机的缺点，且调速特性与直流调速性能完全一样甚至超过，如过渡过程快等。故近来主要是使用交流电动机驱动和交流调速，特别是新建的机组，甚至大功率（单机达9000kW）、要求严格的带钢热连轧机也使用交流电动机驱动和交流调速（参看表1）。

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