JPS5810614A - Measurement of residual pig iron on bottom of blast furnace - Google Patents

Abstract

PURPOSE:To achieve a safe hot rakeout by inserting a residual iron pig measuring rod in such a manner as to be free to move into an out of a through hole provided in an iron shell and a firebrick at a higher position that the level of a residual pig iron withdrawing opening. CONSTITUTION:An insertion opening 6 is provided in an iron shell 3 and firebrick 4 at a higher position the level of a residual iron pig opening 2 to insert a residual iron pig measuring rod 5 simulatenously with or after the blowout a blast furnace 1. At the same time, a frame 7 is temporarily built to match the lower end level of the insertion opening 6 and for example, a crawler type measuring machine 8 carrying the iron pig measureing rod 5 thereon 7. The residual pig iron measuring rod 5 is inserted into a corroded part of the furance bottom and operated to measure the level of the pig iron from the angle of insertion and the attachment length of the pig iron. This enables the detection of the presence of the residual pig iron and the measurement thereof after the with drawal thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION When a blast furnace is repaired in a short period of time, the present invention can be carried out at the same time as or after the blowout is stopped! ! The present invention relates to a method for measuring the amount of residual pig iron in order to safely scrape out l1la and contents.

In order to increase the operational efficiency of the Kinken blast furnace and reduce the cost of renovation and repair, the period of renovation of the blast furnace was shortened, and the dust bedding of the blast furnace before renovation was replaced with less damaged ones. As a means of efficiently shortening the above-mentioned repair period and reusing the blast furnace, hot raking of the contents of the blast furnace was carried out at the same time as the blow-stopping. ing.

By the way, when carrying out hot scraping of the contents of a blast furnace, it is essential to confirm the presence or absence of the amount of residual pig iron after removal of the residual pig iron in order to prevent disasters. In other words, if the furnace bottom is eroded below the #IcJ level or if the eroded surface of the furnace bottom is not flat, it will be completely removed! If there is a large amount of residual pig iron after removing the residual pig iron, the residual pig iron will flow out at the same time as the blast furnace side wall is opened to carry out hot scraping. This is because it is difficult and dangerous for the worker.

However, currently, the hearth temperature is determined by placing a temperature needle at the appropriate location at the hearth bottom, and this measured temperature is used to check the corrosion status of the hearth bed bricks, or to determine the hearth bottom temperature at the appropriate location. nioo
There is no way to reliably determine the amount of residual iron after extraction, except to determine the corrosive force of the furnace mold bricks by setting ejl and measuring the amount of Oo contained in the tapped iron. Met.

The present invention was made in view of the above-mentioned problem, and is designed to safely carry out hot scraping during blast furnace renovation. The purpose is to provide a method.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below based on the drawings.

The present invention is characterized in that the iron shell (j
) and the furnace wall bricks (4) are provided with a gate (6) for insertion of the residual pig iron storage gauging (II). Frame (7)
For example, a tabular type 1 fixed machine (6) on which the residual pig iron amount measuring rod (S) is mounted so as to be able to go in and out instantaneously is installed, and the residual pig iron amount II fixed amount (li) is measured in the furnace. The method is characterized in that the insertion operation is performed toward the eroded part (9), and the amount of residual pig iron is measured based on the insertion angle of the residual pig iron (S+) and the adhesion length of the residual pig iron.

In addition, - is the contents of the blast furnace.

As described above, according to the present invention, it is possible to measure the presence or absence of residual pig iron after removing the residual pig iron and the amount of residual pig iron.・Unlike the conventional method, unexpected leakage of residual pig iron occurs at the exit of the blast furnace side 11 during hot scraping. This invention is extremely effective in terms of the safety of beam builders.

By the way, when the method of the present invention was implemented in a Mu blast furnace, a hole of φ55 was opened for removing residual pig iron at a position 7510 above the 1 residual pig iron position, and a residual pig iron of 500 TOM was applied.
After draining and removing the residual pig iron, the lower part of the taphole 200■
A hole of φ6o was opened through the steel shell and furnace wall Len I at the position of , and a mount on which a measuring device, in this case a crawler type, was mounted was placed outside the furnace, and the hole was inserted into the furnace bottom from the above-mentioned entrance. Insert a fixed amount of residual pig iron toward the eroded area to completely remove the residual pig iron from the eroded area at the hearth bottom.After confirming that no residual pig iron remains at the hearth bottom, hot scraping of the contents is carried out.・During hot scraping! The work was carried out safely without any leakage of the pig iron.

[Brief explanation of drawings]

The drawing is a schematic explanatory drawing showing one embodiment of the method of the present invention. (1) is a blast furnace, (1) is a pig iron removal opening, (1) is an iron shell,
(4) is a furnace wall brick, (lI) is a residual iron amount measuring rod, (6)
The symbol is the insertion opening, (I) is the measuring device, and (-) is the eroded part of the hearth bottom. Patent applicant: Sumitomo Metal Industries, Ltd.

Claims (1)

[Claims] (At the same time as or after the blast furnace blow-off, a through-hole in the shell and furnace-brick is provided at a position higher than the level of the residual pig iron removal opening, and the amount of residual iron i1 that can freely go in and out of the furnace through the through-hole is A method for measuring the amount of residual pig iron at the bottom of a blast furnace, characterized in that a mounted measuring device is installed, and the amount of residual pig iron is leaked by inserting the measuring device from the key entry hole of the fixed amount toward the intrusion part of the furnace hawk. Method.