Online comprehensive control method for hot-galvanized continuous annealing furnace

Abstract

The present invention discloses an online comprehensive control method for a hot-galvanized continuous annealing furnace. The method collects the operating information, including band steel speed, processing technique, steel coil codes and band steel specifications, of band steel through an online detection module. According to the collected operating information of band steel, the method calls main parameters through an expert database, so as to complete thermal load setting and speed setting by the co-operation of a speed model, a heat transfer model and a band temperature feedback model. Therefore, according to the set parameters, the method automatically controls a primary control system, so as to achieve the online production control of an annealing furnace. Based on heat transfer mechanism analysis, the method achieves the online production control of an annealing furnace by building a one-dimensional math model and the expert database with two cross-control methods: coarse tuning and fining tuning. In addition, the method also provides an additional series of complete control strategies such as a transition control method, so as to form a relative perfect control method. The models can be built conveniently and operate fast. Therefore, the method is suitable for the online production computation and control of an annealing furnace.

Description

technical field [0001] The invention belongs to the field of automatic control, and relates to the automatic on-line control of a hot-dip galvanizing continuous annealing furnace, in particular to a heat transfer mechanism in the annealing furnace as the research object, using a strip steel temperature tracking mathematical model, and adopting two types of automatic control, coarse adjustment and fine adjustment. Online automatic control method combined with regulation. Background technique [0002] At present, there are many galvanizing annealing furnaces in China, but compared with foreign countries, there is a certain gap in the control level of annealing furnaces in my country, and the control level of the overall system and individual equipment needs to be further improved. Japan's Nippon Steel Corporation Kimitsu Steel Works completed and put into operation the world's largest continuous annealing line in August 1991. In the annealing furnace section of the operation ...

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Problems solved by technology

[0003] At present, some patent applications have been filed in China on the control method of annealing furnaces, but most of them are for the first-level control, such as CN201020204449.7, CN201020528237.4 and other patents, which mainly realize the direct feedback control of equipment, furnace temperature and belt temperature , lack of mathematical model and theoretical basis

The annealing kiln heating system whose patent number is CN201020256197.2 is mainly a method for heating partition control, lacking an overall control method

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