JPS5829452B2 - Method for collecting samples of contents inside the blast furnace after blowing down - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for collecting a sample of the contents of a blast furnace for investigating the condition inside the furnace after blowing down a blast furnace, particularly at a stage where the contents of the furnace have not yet solidified. The invention relates to a method for taking samples of the so-called granular zone.

While the ore, coke, lime, etc. charged to the upper part of the blast furnace descend through the furnace, they become hot metal and slag through a reduction reaction under high temperature and high pressure conditions due to rising hot air from the lower part.
Elucidating the behavior of the charge during this process is important for blast furnace operation, and efforts are being made to clarify this using various methods.

Investigating and observing the conditions inside the blast furnace after blowing down is a great opportunity to obtain data that will help clarify the conditions inside the blast furnace during operation.

Efforts are being made to investigate the behavior and reaction processes of the contents inside the blast furnace by observing cross sections and collecting samples during the disassembly and scraping process after the blast furnace has been blown down.

Samples for this investigation are collected by core boring or direct sampling, but although it is possible to collect samples from iron residue and similar solidified parts using the core boring method. It is completely unsuitable for sampling the so-called granular zone, which is in the state of ore or coke and has not yet solidified.

Furthermore, even when samples are taken directly in the furnace, the granular zone is collected as an inclined cross section close to the angle of repose, making it impossible to directly collect a vertical cross-section sample required for investigation.

The present invention solves the above-mentioned drawbacks of the conventional method for sampling the contents of the furnace.
This paper proposes a method that solves the problem and collects a sample of the granular zone that has not yet solidified with the contents of the furnace after blowdown.

In the present invention, first, the cross-sectional position of the sample collection point is determined, and a plurality of steel pipes of a predetermined diameter are driven into a predetermined position along the cross-section until they reach the consolidated layer.

Each of the steel pipes that have been driven into the pipe has the contents forming a granular band still present therein, cut out and contained within the pipe.

Using such a group of driven steel pipes as a partition wall, other parts are dug down until the lower ends of the steel pipes are exposed, and blind plates are attached to the lower ends of each steel pipe to prevent the sample collected inside the steel pipes from flowing out.

Next, the steel pipe with the blind plate attached is moved from inside the furnace to a predetermined location outside the furnace.

In this way, according to the method of the present invention, it is possible to collect a sample at the assumed vertical cross section of the granular zone while the sample remains in its current state without being influenced by the outside, and is contained inside the steel pipe. .

The details of the present invention will be specifically explained below with reference to the drawings.

Figure 1 shows the state of the contents in the blast furnace after blowing down the vertical cross section of a preselected sample collection point, and the state of the steel pipe for sampling when it is driven along the vertical cross section of the sample collection point. FIG.

The residual pig iron and similar molten substances that were in a molten state at the time of blast furnace blowdown solidify after blowdown to form a consolidated layer 3, and the unmelted charge in the upper part of the furnace is transferred to the top of the consolidated layer 3. granular zone 2
is formed.

To sample the granular band 2, the steel pipe 1 is driven along a vertical cross section of a preselected sample collection point, and the driving ends when the steel pipe 1 reaches the consolidated layer 3.

As a steel pipe for sample collection, it is required that it can be driven into the steel pipe, and that the sample cut and stored inside the steel pipe does not disturb the existence state of the granular zone.
It has been confirmed that grade A steel pipes are appropriate.

After driving a predetermined number of steel pipes along the vertical section of the sample collection point until they reach the solidified layer 3, the steel pipes are tied together or a separate steel pipe fall prevention device 4 is installed to form a partition wall. form.

Next, as shown in FIG. 2, other parts of the partition wall are excavated in accordance with the usual method, and granules are scraped out and removed while digging down to the lower end of the steel pipe.

When the lower end of the steel pipe is exposed, a blind plate 5 is attached to the lower end by means such as welding to prevent the sample inside the steel pipe from flowing out.

The steel pipe 1 with the blind plate 5 attached thereto, with the sample contained inside, is moved from inside the furnace to a predetermined position outside the furnace, laid down horizontally, and the steel pipe is cut in the length direction to remove the sample inside. The condition of the granular zone at the sampling location can be investigated by using the sample.

By carrying out this investigation procedure for each steel pipe and integrating the results, it is possible to understand the condition of the granular zone inside the blast furnace after blowing down the blast furnace, and by extension, the behavior of the charge during blast furnace operation. We will provide materials for investigation.

In the present invention, the group of steel pipes for sample collection driven along the vertical cross section of the sample collection point forms a partition wall in the granular zone, so it is possible to dig down and remove other parts along the group of steel pipes. Moreover, the work can be done efficiently and safely.

In addition, since the driving of steel pipes stops at the consolidated layer, driving a group of steel pipes for sample collection can be used as a starting point to know the extent of iron residue or similar solidified parts. It is also useful as a preparation material for crushing and demolition by blasting, etc.

The present invention makes it possible to collect a vertical cross-section sample of the granular zone of the contents of the blast furnace after blowing down the blast furnace, which was previously impossible to collect, and a sample of the granular zone in its existing state. The effect of contributing to the investigation of the behavior of the charge during operation is significant.

[Brief explanation of the drawing]

The drawings show an actual embodiment of the present invention, and FIG. 1 is an explanatory diagram when a steel pipe for sample collection is driven, and FIG. 2 is an explanatory diagram when a sample is collected. 1...- Steel pipe, 2-... Granular band, 3...
... Consolidation layer such as residual iron, 4 ... Preventing steel pipes from falling, 5
...Blind board.

Claims (1)

[Claims] 1. When sampling the contents inside the blast furnace after blowing down the blast furnace, a plurality of steel pipes of a specified diameter are vertically driven into the specified position of the sample collection point until reaching the solidified layer, and the group of driven steel pipes is used as a partition wall to remove other parts. Dig down until the bottom end of the steel pipe is exposed.
Next, a blind plate is attached to the lower end of each of the steel pipes, and the steel pipes are sequentially moved from inside the furnace to a predetermined position outside the furnace and cut in the length direction, and the condition of the granular zone inside the furnace is determined based on the sample contained in the tube. 1. A method for collecting samples of contents in a blast furnace after blowdown, which is characterized by investigating.