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为避免加热炉支路温度平衡控制时的动态耦合引起系统波动甚至不稳定,本文提出了一种基于稳态能量平衡的加热炉支路平衡控制方案,并进行了收敛性分析。根据稳态能量平衡计算出各支路需调整的流量,使各支路温度趋向一致。支路平衡控制采用长控制周期的稳态控制和区域控制。分析表明,所提出方案易于稳定,且接近稳态下的理想控制。另外,实现了支路温度均衡下加热炉进料总流量自动提降负荷控制。仿真和现场应用结果表明,控制方案合理,效果良好。
In order to avoid the dynamic instability of the system caused by the dynamic coupling in the temperature balance control of branch of heating furnace, this paper presents a balance control scheme of furnace branch based on steady-state energy balance and the convergence analysis. According to steady-state energy balance to calculate the need to adjust the flow of each branch, so that each branch temperature trends. Branch balance control using long-term control of the steady-state control cycle and regional control. The analysis shows that the proposed scheme is easy to be stable and close to the ideal control in steady state. In addition, the realization of the branch temperature equalization of the total feed flow of the furnace automatically raise and lower load control. Simulation and field application results show that the control scheme is reasonable and the effect is good.