On line observation of quality control is a pivotal task for Advanced Process Control(APC). The on line observation system of crude tower side draw quality control for APC was built.

为了实时获得原油分馏中待控质量指标的可靠数据，保证先进过程控制的应用效果，建立了分馏过程侧线质量指标的在线观测计算系统；

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Finally, base on hot water heater SZS4.2-1.27/95/75Y, I simulate with this subsystem of APC (Advanced Process Control) configuration software on this paper.

最后，本文以SZS4.2-1.27/95/75Y型号加热炉为背景，应用本文开发的系统，对该型号加热炉进行仿真实验。

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