Method for determining master-slave control proportional factor of hot rolling heating furnace

Abstract

The invention relates to the field of controlling processes of a hot rolling heating furnace, in particular to a method for determining a master-slave control proportional factor of the hot rolling heating furnace. The method comprises the following steps of: 1, determining heat energy consumed during a forecasting period of time, wherein the heat energy includes the heat energy which a plate blank needs to absorb, the heat energy lost by the furnace wall, the heat energy consumed by cold water, heat loss of a furnace door and heat loss of other parts;2, according to a forecasting model established on the basis of a thermal balance equation, working out the amount of fuel needed by the upper parts and the lower parts of all segments of the heating furnace during the forecasting period of time; and 3, according to the forecasted amount of fuel needed by the upper part and the lower part of the current segment of the heating furnace, determining the master-slave control proportional factor, and making the rolling optimization according to the actually measured flow rate of the fuel on the upper part and the lower part of the heating furnace. The method has the advantages of better meeting the requirements on heating quality and line rolling rhythm of the plate blank, saving energy, and overcoming the defects of the master-slave control of the prior hot rolling heating furnace that the upper-lower part fuel proportional factor set by artificial experience is not accurate.

Description

technical field [0001] The invention relates to a method for determining the master-slave control ratio coefficient of a hot rolling heating furnace, and belongs to the field of hot rolling process control. Background technique [0002] The main function of the hot rolling heating furnace is to heat the slab to reduce the deformation resistance, optimize the structure and performance, achieve the target temperature and soaking degree required by the process, and meet the requirements of the rolling line rhythm, while saving energy as much as possible. If the furnace temperature of the slab is too high or too low, it will cause serious oxidation and burning loss or increase the load of the rolling mill, which will also directly affect the final microstructure and properties of the product. [0003] The slab heating control of the heating furnace is a nonlinear dynamic system with a large lag, and there are many uncertain factors. In order to ensure the target temperature and ...

AI Technical Summary

Problems solved by technology

At present, there are two ways to determine the proportion coefficient of the master-slave control method of the heating furnace. One is to directly control on the first-level computer. The proportion coefficient of the upper and lower fuels of each section of the heating furnace is manually input by the operator through the operation interface. It has great randomness, and the change is inflexible. It relies entirely on manual operation and cannot meet complex and changeable production requirements.

The second method is set by the secondary process computer. The method that is often used at present is to count the operator's experience into tabular data, and then select it according to different situations. The main disadvantage is that the tabular is a kind of empirical data, which cannot be very good. Adapt to the heating conditions of different slabs

At present, the heating furnace process control calculation system generally has a heat balance function. According to the on-site production situation, the fuel digestion produced by each team is counted, but there is no heat balance to predict the change ratio relationship of the fuel flow in the upper and lower sections of the heating furnace within a certain period of time. , so that the method of automatic combustion control

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