Nonlinear control device of thermal coupling air separation tower

Abstract

The invention discloses a nonlinear control device of a thermal coupling air separation tower. The nonlinear control device is composed of an intelligent instrument connected to a thermal coupling airseparation tower directly, a controller and a DCS system. The DCS system consists of an upper computer, a control station, a storage device, a field bus, and a data interface; the storage device, thecontrol station, and the upper computer are connected to the data interface through the field bus. The intelligent instrument is connected with the data interface. The upper computer is used for solving a control signal and transmitting the solved control signal to the control station through the field bus. The control station adjusts the controller through the data interface connected with the field bus based on the obtained control signal. The controller is used for realizing direct controlling and adjustment of a thermal coupling air separation tower. According to the nonlinear control device provided by the invention, the nonlinear control problem of the thermal coupling air separation tower is solved well. The control device has advantages of high-efficiency online operation speed and good control effect and interference suppression effects.

Description

technical field [0001] The invention relates to the field of nonlinear control of industrial energy-saving control, in particular to a nonlinear control device for thermally coupled air separation towers. Background technique [0002] The air separation unit is a device that separates air and obtains high-purity industrial gases such as oxygen, nitrogen, and argon. It is widely used in various industries such as petroleum, chemical industry, metallurgy, electronics, energy, aerospace, food and beverage, and medical care. industrial field. The resulting oxygen, nitrogen and argon products are widely used in the national economy of a country. Since the two "oil crises" in the 1970s, the energy crisis has deepened, and the effective use of energy in many fields is strongly required. In the air separation industry, which consumes a lot of energy, energy costs account for 75% of the price of air products. So there is such a situation. On the one hand, due to the development of...

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Problems solved by technology

However, due to the complex nonlinear dynamic characteristics of the thermally coupled air separation process, such as strong coupling, strong ill-conditioning, strong asymmetry, and strong reverse response, the control strategy design of this tower is particularly difficult

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