Surface purging control method of hot-rolled low-temperature coiled strip based on temperature

Abstract

The invention relates to the field of strip steel surface purging, in particular to a temperature based hot-rolling low-temperature strip steel reeling surface purging control method which comprises the following steps: nozzles f a surface purifying device are divided into a plurality of groups, and a purging controller is adopted to control open-close of the nozzles; the function relationship between the laminar cooling temperature and the initial purging strength is obtained; a strength compensation factor is set according to the strip steel target reeling temperature; and the purging controller controls the open-close of the nozzle groups. With adoption of the temperature based hot-rolling low-temperature strip steel reeling surface purging control method, the purging controller obtainsthe data of an upstream-downstream laminar cooling device and a reeling device through an industrial control computer, determines the purging quantity corresponding to the laminar cooling quantity through testing, corrects the purging quantity by utilizing the purging quantity and can precisely determine the actual demanded purging quantity of strip steel, so that the current situation that a great amount of air is compressed to cause ineffective purging during the purging process is avoided, and the energy is saved, the energy consumption of ton steel production is reduced and the demand ofcost decreasing and benefit increasing is met while ensuring the purifying effect of the upper surface of strip steel.

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

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