【摘要】 针对宝钢制氧分厂氮气纯度超标问题，建立了包括压缩设备和制氧机在内的低压氮气管网系统模型。通过对系统压力、流量以及响应时间等量变化的计算，分析了调节方式与状态量的相互影响。结果表明，两种不同的氮气压力控制方式共存于同一低压系统是氮气纯度超标的主要原因。系统流量的突然大幅波动会引起不同的调节动作，使系统压力瞬时失控，不纯气体进入低压管网，造成氮气纯度恶化。结合实际情况，提出一种适应现场条件的解决方案。更多还原

【Abstract】 To solve nitrogen purity fluctuation at Baosteel,a network simulation model including compressors and air separation plants has been established based on the structure of nitrogen network and its control methods.Calculation and analytic results show that when two or more pressure control ways exist in one network,they must be accurately coordinated with reasonable reliability to avoid low purity N 2 leak into the network of lower pressure affecting the N 2 purity.A project to modify the control processes has been used at BISC,The purity fluctuation is avoided without new hardware added.更多还原