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本文提出在原油加热炉进料控制中应用的一种新型高级控制策略.为了克服原油加热过程中的支路流量耦合特性和不确定性,采用一种两层递阶控制结构.其中,上层是支路流量控制回路的设定值控制器,它通过重新分配加热炉进料流量来实现加热炉支路出炉温度平衡、通过原油加工量自动提降控制器来按规定的提降速率和幅值提降处理量(对于常压炉)或者通过非线性液位控制器来调节加热炉的各支路流量(对于减压炉);下层是支路流量解耦控制回路,它包括支路流量自适应解耦器和自适应控制器,并接收由上层在线修改的设定值.最后举例说明其可行性和有效性.
This paper presents a new type of advanced control strategy applied in the feed control of crude oil heating furnace. In order to overcome the coupling characteristics and uncertainties of branch flow during crude oil heating, a two-level hierarchical control structure was adopted. Among them, the upper is the branch flow control loop setpoint controller, which re-distributes the heating furnace feed flow furnace outlet temperature to achieve the balance of the furnace, crude oil processing capacity by automatically raising and lowering the controller to the required lifting Rate and Amplitude Boost Capacity (for Atmospheric Pressure Furnaces) or by means of a non-linear level controller to regulate the flow of each leg of the furnace (for a vacuum furnace); the lower is the branch flow decoupling control loop which includes Branch flow adaptive decoupler and adaptive controller, and receive the settings modified by the upper online. Finally, an example of its feasibility and effectiveness.