Method for controlling overall-length temperature uniformity of discharged plate blank of vehicle bottom type heating furnace

Abstract

A control method for overall-length temperature uniformity of tapped slabs of a vehicle bottom type heating furnace comprises the steps that sampling points are arranged on the left side and the right side of a first-pass steel billet of a roughing mill in the steel billet length direction, and the steel billet tapping temperature of each sampling point is determined according to steel rolling data; establishing corresponding section division for each sampling point according to furnace section division, and establishing data fusion taking the billet tapping temperature of each sampling point as a data source for each section; the temperature adjustment amount of each section is formed according to data fusion, and temperature self-adaptive correction is established for each section according to the temperature adjustment amount; accordingly, temperature feedback adjustment of each section is established, and control over the overall-length temperature uniformity of the plate blank is achieved. According to the control method for the overall-length temperature uniformity of the discharged plate blank of the car-bottom-type heating furnace, the overall-length temperature uniformity degree of the discharged steel plate of the car-bottom-type heating furnace can be clearly represented, and the head and tail temperature difference of the discharged temperature of the medium and thick plate of the car-bottom-type heating furnace is reduced.

Description

technical field [0001] The invention belongs to the field of automatic control of a medium and heavy plate rolling production line, and particularly relates to a method for controlling the temperature uniformity of the full length of a slab discharged from a car-bottom heating furnace. Background technique [0002] At present, some medium and heavy plate rolling production lines are equipped with a car-bottom heating furnace, which is used for heating large parts, special-shaped parts and heavy parts. The car-bottom heating furnace is an intermittent heating furnace that operates periodically. Multiple burners, multi-stage control (front and rear, up and down, left and right). The car hearth furnace is usually not equipped with a secondary control system, and there is no heat tracking function for the temperature of the steel plate. Car-bottom heating furnaces are often used to heat heavy and extra-thick steel billets, such as extra-thick electroslag remelting ingots. The f...

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Problems solved by technology

Second, after the slab comes out of the furnace, it is transported to the descaling box. The device sprays the surface of the slab at high speed, which can blow away the scale once. However, when the slab leaves the descaling box, the high-temperature slab will soon be attached The upper layer of thinner oxide scale (secondary oxide scale) seriously affects the temperature measurement accuracy, and after the slab is descaled, due to the influence of descaling water, the temperature distribution in the thickness direction of the slab changes drastically, and the slab The surface temperature drops sharply and then rises quickly, so even if a pyrometer is equipped, the measured temperature at this time can hardly represent the overall temperature level of the slab

Third, due to the existence of the descaling box, the area between the roller table of the heating furnace and the rough rolling mill is full of water vapor, splashes of iron scale, and the measurement environment is harsh

As for how to truly, stably and reliably measure the high-temperature steel slab after being baked, some existing technologies use a non-contact thermometer to establish measurement, but due to the interference of the iron oxide scale on the surface of the steel plate and the high-temperature and high-humidity environment, the measurement results are very inconsistent. reliable

In the prior art, there is also a measurement established by a contact thermometer. The advantage of the contact thermometer is that it overcomes the impact of the measurement environment on the measurement accuracy of the non-contact thermometer. The disadvantage is that the instrument in a high temperature and high humidity environment It is difficult to maintain, and the second is that contact temperature measurement will reduce the transportation speed of slabs and reduce production efficiency

At the same time, the existing technology also has the following problems: the heating control state is open-loop operation, and there is a lack of adaptive control technology solutions that can improve the temperature uniformity of the billet over the entire length; , Practical measurement scheme

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