Method for monitoring falling off of distributing chute of blast furnace

Abstract

The invention discloses a method for monitoring the falling off of a distributing chute of a blast furnace. The method comprises the steps of adopting scanning radar to determine the shape of a chargelevel, specific as follows: a charge level scanning radar unit, a database unit, construction of a chute state recognition knowledge base unit, top charge level shape pattern recognition, etc; if theshape of the charge level is similar to a normal case base, judging that the chute is normal, and enabling the blast furnace to normally work; and if the shape of the charge level is similar to an abnormal case base, judging that the chute works abnormally, and carrying out blast furnace maintenance. According to the technical scheme, whether the distributing chute of the blast furnace falls offor not can be found in the first time according to the abnormal distribution of the charge level; once the distributing chute falling off is recognized by the abnormal charge level, a computer gives an alarm in time, the blast furnace shuts down, the top of the blast furnace is opened for manhole maintenance, a new chute is mounted in time, and therefore the blast furnace loss is significantly reduced.

Description

Technical field [0001] The invention relates to the technical field of online diagnosis of blast furnace equipment, in particular to a method for monitoring the falling of a blast furnace distribution chute. Background technique [0002] At present, almost all ironmaking equipments are blast furnaces. The blast furnace is a super-large high-temperature and high-pressure reactor. With the progress of the current large-scale blast furnace, almost all blast furnaces use the distribution chute to realize the distribution process of the blast furnace. The distribution chute works In the environment of high temperature (80-350℃), high pressure (0-2.5atm), high dust (50-300mg / m3), its length is 3-5m, the weight is up to 1.5-3.0 tons, and it is semicircular or Rectangular, it is suspended on the gear box by a suspension mechanism, and the predetermined movement track of the chute is realized through the operation of the gear box. The movement of the charge on the chute is realized by the...

AI Technical Summary

Problems solved by technology

[0003] Once this nearly sinusoidal distribution is destroyed, it will cause many problems, such as destroying the drop of charge, or uneven distribution of gas flow. This instability will cause abnormal reaction, affect the discharge of blast furnace slag and molten iron and the life of blast furnace, usually cause huge losses

[0004] In the blast furnace production, the most serious fault that destroys the nearly sinusoidal distribution of the charge is the shedding of the chute. Due to mechanical failure or production accidents in the blast furnace production, the chute will break away from the gear box suspension mechanism and fall into the blast furnace. At this time, the charge will be lost once it leaves the discharge door. If the adjustment mechanism is removed, it will fall directly to the center of the blast furnace through the central throat. This situation seriously destroys the principle of nearly sinusoidal distribution of charge in the radial direction of the furnace throat, and will cause serious harm to the production of the blast furnace.

However, since the chute is operated in a closed high-pressure container, it is a "black box" operation. Once the chute falls off, it is difficult to even find it. Once this situation occurs, it will cause great harm to the blast furnace production and cause heavy losses to the enterprise.

[0005] As shown in the document "Li Jianhua, Measures to Improve the Service Life of the No. 2 Blast Furnace of Xuanyuan Iron and Steel Co. Observing the operation status of the chute by infrared equipment solves some problems, but due to the direct contact between the infrared equipment and the furnace, the water vapor and dust in the furnace are easily bonded to the lens and interfere with the infrared measurement. In many cases, it is difficult to find the chute running status of

After all, infrared measurement is an indirect observation device for measuring the temperature distribution in the furnace through infrared rays. Its main function is not to observe the state of the chute. At present, the infrared device does not have the alarm function of the operation status of the chute. In addition, there are few on-site operators, and no one pays special attention through infrared devices. The running state of the chute, so it is difficult to detect the movement state of the blast furnace top distribution chute in time only through the infrared equipment on the furnace top

[0006] The document "Zhao Yanting, Qiao Xianping, Accurately Judging Blast Furnace Distribution Chute Falling Accidents Using Historical Trends (Electric World, 2017-8, P43-44)" provides a method to predict the operating state of the chute by using the current change of the rotating motor. The change of the rotating current of the chute is used to evaluate the working state of the chute. Since the rotating current is affected by various factors such as the weight of the chute, the connection method, the hydraulic pressure and the lubrication method, there is a large error in judging whether the chute is off or not solely by the current.

[0007] For example, "Li Jianhua, Measures to Improve the Service Life of the Blast Furnace No. 2 Blast Furnace at Xuanyuan Steel" (Ironmaking, Issue 4, 2015, Vol34, No2, P24-27"), "Zhao Yanting, Qiao Xianping, Using Historical Trends to Accurately Judge Blast Furnace Distribution As shown in the chute falling accident (Dianshijie, 2017-8, P43-44), the current two methods for directly judging the status of the blast furnace distribution chute have shortcomings such as large errors, untimely, unintuitive, and insensitive responses

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