【作者】 王瑾辉； 孔建益； 孔平； 杨金堂； 李公法；

【Author】 WANG Jinhui~(1,2),KONG Jianyi~1,KONG Ping~2,YANG Jintang~1,LI Gongfa~1 1.College of Machinery and Automation,Wuhan University of Science and Technology,Wuhan 430081,P.R.China 2.Hebei Iron & Steel Group Co.Ltd,Shijiazhuang,050000,P.R.China

【机构】 武汉科技大学机械自动化学院； 河北钢铁集团公司；

【摘要】 氧气生产与后序工艺密切相关,而后序工艺用氧的特征是用量大且变化幅度也大,并与后序工艺生产的节奏紧密相关,是间歇式用氧负荷,故氧气生产上经常出现氧气放散或供不应求两种现象.前者不利于氧气生产的节能降耗及经济运行指标,后者影响后序工艺生产,甚至影响到整个后序工艺生产线的生产组织和经济效益.制氧生产自动变负荷系统,就是根据用户用氧量的变化,自动调节生产运行工况,运行参数在自动控制过程中,向最佳点逼近,以实现优化操作.由于空气分离过程具有装置多、流程长、相关性大、结构复杂的工艺特点,决定了变负荷过程操作具有涉及控制点多、相关因素耦合严重、操作难度大、过程变量之间相互干扰严重的特点.针对空分生产自动变负荷过程的控制要求,在介绍现有空分生产自动变负荷技术基础上,建立了实现自动变负荷功能的控制策略,详述了该策略的技术结构、工艺控制方案、控制原理和相关算法.实际运行效果表明了该策略的有效性,能够实现空分装置的自动变负荷.更多还原

【Abstract】 Oxygen production has closely relationship with following-procedure,oxygen consumption in following-procedure has the characteristics of huge consumption,big-range change and closely link with produce rhythm in following-procedure.It’s intermittence load of oxygen consumption,so oxygen production presents two kinds of phenomena,such as oxygen diffusing or short supply frequently.The former is unfavorable to saving energy and reducing the cost and economical operation index of oxygen production,the latter affects following-procedure production,production organization and economic benefits of whole following-production line even.The process of air separation unit has the characteristics of many types of equipment,long flow, and strong relativity and complicates structures.Therefore automatic variable-loading operation has the characteristics of many control points,strong coupling in relevant factors,great difficult in operation and serious interference among course variables.A control strategy to achieve the goal of automatic variable—loading for the control limits in the variable-loading process of air separation unit was proposed on the basis of introduction of automatic variable-loading technology.The technology structure, technological control schemes,control principle and related algorithm for the control strategy were described in detail.The application shows its effectiveness,it can realize the automatic variable-loading of air separation unit.更多还原