A Control Device for Internal Thermally Coupled Air Separation Tower Based on Concentration Curve Characteristics

Abstract

The invention discloses an internal thermally-coupled air separation tower control device based on the characteristic of a concentration curve. The device includes an intelligent instrument connectedwith an internal thermally-coupled air separation tower, a controller, and a DCS system. The DCS system includes a principal computer, a control station, a storage device, a field bus, a data interface and a storage device. The intelligent instrument measures relevant parameters through a temperature detection element, a pressure detection element and a flow detection element. The principal computer is used for solving control parameters and transferring the control parameters to the control station through the field bus. The control station adjusts the controller through the data interface connected with the field bus according to the control parameters. The controller directly controls and adjusts the internal thermally-coupled air separation tower. The control device provided by the invention can well deal with the strong nonlinear characteristics of the internal thermally-coupled air separation tower, has high online operation speed, and has a very good servo tracking control effect and interference suppression effect.

Description

technical field [0001] The invention relates to the field of nonlinear control of industrial energy-saving control, in particular to the design of a control device for an internal heat-coupled air separation process. 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 de...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the current internal thermally coupled air separation tower control device, which has poor interference suppression ability, poor control effect, and difficulty in realizing accurate set value tracking, the purpose of the present invention is to provide a good interference suppression ability, good control effect, which can realize Nonlinear control device for internally thermally coupled air separation column with accurate and rapid set point tracking

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