High-precision purging feedback control method for hot-rolled laminar low-temperature strip steel surfaces

Abstract

The invention relates to the field of strip steel surface purging, in particular to a hot-rolled low-temperature coiling strip steel surface purging control method. The high-precision purging feedbackcontrol method for the hot-rolled laminar low-temperature strip steel surfaces comprises the steps that nozzles of a surface purification device are divided into a plurality of groups, a steel type purging characteristic database is established, and the benchmark purging intensity corresponding to each steel type is obtained through tests and stored in the steel type purging characteristic database; after steel type numbers, the strip steel target coiling temperature T and strip steel temperature data measured through a temperature measuring device are obtained through a purging controller from an upper industrial control computer, the steel type purging characteristic database is invoked, the strip steel temperature data is judged, and the opening number of the nozzle groups is controlled. According to the purging control method, the measuring data of the temperature measuring device are judged and fed back in real time after the benchmark purging intensities are determined, the purging effect is guaranteed as much as possible, and the energy consumption is reduced, so that the production cost and the energy consumption of per ton of steel are reduced, and the produced competitiveness is improved.

Description

technical field [0001] The invention relates to the field of strip surface purging, in particular to a method for controlling the surface purging of a hot-rolled low-temperature coiled strip. Background technique [0002] Such as figure 1 As shown, the coiling process of the existing hot-rolled low-temperature strip steel is that the strip steel 1 passes through the finishing stand 2, the laminar flow cooling device 3, the surface cleaning device 4, the temperature measuring device 5 and the coiling device 6 in sequence. After the steel 1 is washed by the surface purification device 4, there will be residual water, which will affect the temperature measurement accuracy and temperature measurement success rate of the temperature measurement device 5, and the temperature is an important indicator affecting the final structure of the strip steel, so the setting The surface cleaning device 4 is used to purge the strip steel 1, and the nozzle of the surface cleaning device 4 spr...

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Problems solved by technology

[0003] When the existing surface cleaning device is applied to the hot-rolled laminar flow area, considering the safety factor and avoiding the occurrence of scrap steel, there is usually a certain distance between the nozzle and the strip, and the hot-rolled low-temperature strip In the purge section, the temperature of the strip steel is usually below 500°C, and the purge air flow from the nozzle decays rapidly with the distance. In order to achieve a certain purge effect, a large air flow is required, which greatly increases the energy consumption of the purge. Therefore, it is necessary to A method that can precisely control the amount of purge to reduce energy consumption and meet the needs of energy saving

[0004] The temperature measuring device 5 on the surface of the steel strip is usually a cross-section thermometer. The principle of temperature measurement is infrared detection. When the temperature measurement is normal, the obtained temperature map is as follows: figure 2 As shown, three temperature measurement points measure a continuous temperature map; when residual water appears on the surface of the strip, the temperature of the water surface will not exceed 100°C, and the temperature map obtained by the final measurement will have defect points, which seriously affects the temperature of the strip. The judgment of temperature and the control of upstream finishing stand and laminar cooling device will ultimately affect the quality of strip steel

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