Multi-loop control device for thermal coupling air separation column

Abstract

The invention discloses a multi-loop control device for a thermal coupling air separation column. The multi-loop control device comprises an intelligent instrument directly connected with the thermalcoupling air separation column, a controller and a DSC system and is characterized in that the DCS system comprises an upper computer, a control station, a storage device, a field bus and data interface, and the storage device, the control station and the upper computer are connected with the data interface through the field bus; the intelligent instrument measures related parameters through temperature and pressure detecting components and 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 according to the obtained control signal; the controller directly controls and adjusts the thermal coupling air separation column. The control device has the advantages that the control of the thermal coupling air separation column can be well achieved, and the device is high in online operation speed and quite good in control effect and interference inhibiting effect.

Description

technical field [0001] The invention relates to the field of industrial energy-saving control, in particular to a thermally coupled air separation tower multi-loop control device. 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 modern industry, some la...

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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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