JPH0446210Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a molten material sampling device used in a vertical furnace such as a blast furnace or a smelting reduction furnace.

[Conventional technology]

The behavior of molten material in the molten zone in front of the tuyere of metallurgical furnaces such as blast furnaces and smelting reduction furnaces has long been an issue that has been sought to be clarified in order to elucidate phenomena such as melting of the tuyere and slag return to the tuyere. It was hot.

The area in front of the tuyere is hot,
Due to the fact that the coke layer is filled and a large heat load condition occurs locally due to the flow of hot metal, etc., a sonde is inserted during the operation of the furnace.
Investigating the inside of a reactor is extremely difficult.

Regarding equipment for gas and sampling and/or temperature measurement in operating blast furnaces,
There is an apparatus disclosed in No. 50-16188. This device is primarily used to collect ore samples from blast furnace shafts and the like. The water-cooled measuring rod is fixed to the drive device of the main body, and the ladle for sample collection is moved in and out of the furnace by the drive device attached to the same pedestal as the measuring rod. The time required to protrude a sample collection container into the furnace to collect an ore sample is short, and there is no need to take special consideration to heat resistance for such a sample collection container. Large steel, stainless steel, and heat-resistant steel could be used. Therefore, there was no need for any special measures to be taken in consideration of the strength of the sample collection container for the sample collection container drive device.

In order to collect molten material in high-temperature areas such as the tuyere and melting zone, it is necessary to check the heat resistance of the sample collection container, the adhesion of molten metal to the sample collection container, or the boundary between the lance body and the sample collection container. There are problems such as malfunction of the sample collection container due to insertion of molten metal into the container, and special measures are required. For sampling at the blast furnace tuyere, see JP-A No. 56-51510.
The tuyere sonde shown in is known. The coke in front of the tuyere is mainly sampled and the temperature is measured at the same time, but sampling of the molten material is difficult because the opening is in the direction of the lance axis. Additionally, the tuyere sonde is a facility that is used only during times of wind cessation. Sondes that can be used at the tuyere of an operating blast furnace are known to perform gas sampling and temperature measurement.
Equipment for sampling melts has not been found in the past.

[Problem that the invention attempts to solve]

A sampling device in the shaft section, which is considered to be relatively similar, is a device that enables sampling of molten materials such as slag and metal in the tuyere section and dissolution zone of a coke packed bed reactor in operation. When applied to the tuyeres, it is necessary to have a heat-resistant sample collection container that can be exposed to temperatures of 1100 to 2000°C in the tuyere and melting zone for 1 to several minutes, When used as a material for sample collection containers, a problem arises in that the strength of the sample collection container decreases.

The purpose of the present invention is to take measures to prevent such containers from being damaged.

[Means for solving problems]

The device of the present invention is a device for sampling the melt dripping into the packed bed from the tuyere of a vertical furnace filled with solids, and consists of the following technical means.

1. Store the sample collection container at the tip of the measuring rod so that it can move forward and backward.

2. A thrust device is provided for advancing the measuring rod body to the sampling position and retracting it to expose the sampling container at the sampling position.

3. It is removably inserted into the hole through which the sampling container enters and exits from the tip of the measuring rod, and when the measuring rod body moves back and forth, the sampling container is protected from collision with the contents of the reactor, and when the measuring rod body moves back and forth, the sampling container is inserted and removed. 4. Includes a tip stopper that falls off from the tip of the rod. 4. Includes a thrust device with a torque limiter that moves the sample collection container back and forth independently of the movement of the measuring rod.

[Effect]

The device of the present invention allows the sample collection container to be taken in and out of the furnace without applying a thrust greater than the strength of the sample collection container to the sample collection container.

The fourth operation of the melt sampling device of the present invention is as follows.
This will be explained with reference to figures a, b, c, and d. Figure 4 shows
Only the measuring rod inserted into the furnace is shown, measuring position 3
0 is the sampling position.

(a) When inserting the measuring rod: When the measuring rod 2 is moved forward, the tip stopper 9 is attached, and a thrust device moves the measuring rod main body while protecting the sample collection container 18 to move it forward.

(b) Push the measuring stick 2 beyond the measuring position 30,
While pulling back the measuring rod 2, the sample collection container 18 is pushed out by a thrust device equipped with a torque limiter, and the tip stopper 9 is thrown into the furnace.

(c) Measuring rod 2 is moved by a thrust device that moves the measuring rod body.
is pulled back, the sample collection container 18 is set at the measurement position, and the melt is sampled.

(d) After completing the melt sampling, the sample collection container 18 is moved to the measuring rod 2 using a thrust device with a torque limiter.
Then, the entire measuring rod is pulled out of the furnace to collect the solidified sample.

This eliminates the need to apply excessive force to the sample collection container and prevents it from being damaged.

〔Example〕

FIG. 2 shows an overall view of an apparatus for sampling the molten material in an operating vertical furnace. FIG. 2 shows a state in which the measuring rod main body 2 is inserted into the coke packed bed 1 in the vertical furnace in operation. The gas seal for the high furnace internal pressure is sealed by a gland packing 4 when the measuring rod is inserted, and by two ball valves 3 when the measuring rod is withdrawn. In addition, a trolley 6 for moving the entire measuring rod is attached to the rear end of the measuring rod.
is driven back and forth by a chain 22 and a chain wheel 23. A hydraulic cylinder or the like may be used instead of the chain.

The diameter of the measuring rod 2 is preferably as small as possible without buckling in order to reduce the driving force, and the larger the melt sample collection container 18 within the measuring rod 2 is, the more melt can be collected.

In a vertical furnace, the amount of molten material dripped into the furnace is several g/
cm ² ·min, about 10-odd g/cm ² ·min. on the other hand,
In order to know the typical composition of the melt in the furnace or to know the rate of dripping, a sample of at least 50-100 g is required. Since the cross-sectional area of the melt sample collection container 18 is several tens of cm ² , it is necessary to leave the melt sample collection container 18 out of the furnace for about one minute. Since the temperature inside the furnace is as high as 1100 to 2000° C., the melt sample collection container 18 is required to withstand this high temperature and not react with the melt (slag, metal). At the same time, it is exposed to rapid high temperatures (1100 to 2000°C), so it is necessary to use a material that is resistant to thermal shock.

As a container that satisfies the above requirements, it is effective to make the melt sample collection container 18 from a refractory material. As the material of the refractory, graphite or SiC is preferable from the viewpoint of heat resistance and thermal shock resistance. Furthermore, when graphite or SiC is used, Al ₂ O ₃ or MgO paste is applied to the surface of the sample collection container 18 to prevent reaction with the molten material.

When inserting the measuring rod 2 into the furnace, a force of several tons to 10 tons is applied to the measuring rod 2. There is also an insert at the tip of the measuring rod.
Since the molten mixture is pressed, the molten material is inserted into the gap between the measuring rod 2 and the sample collection container 18 when the tip end is open, making it impossible for the sample collection container 18 to move forward. Alternatively, problems such as the sample collection container 18 made of refractory material breaking occur.

For this reason, in the present invention, when inserting the measuring rod into the furnace, a tip stopper 9 is attached to the measuring rod 2 to protect the sample collection container 18. After inserting the measuring rod 2 to a predetermined position, the container 18 is advanced, the tip closure 9 is pushed out into the furnace, and the container 18 is discarded into the furnace. After that, return the measuring rod to the measurement position and place the container 18 into the furnace.
Let it out for a few minutes and sample the melt. After sampling is completed, the container 18 is re-stored within the measuring rod.

FIG. 1 shows a detailed diagram of the drive device for the sample collection container. The hydraulic cylinder 13 and the hydraulic rod 12 are firmly fixed to a truck base 17 on the truck with bolts. The entire truck 6 (FIG. 2) is attached to a guide frame 8 (FIG. 2), and the measuring rod 2 is inserted into a predetermined measurement position by moving the truck or by using a hydraulic cylinder. A thrust device 16 with a torque limiter device is also mounted on the same trolley base 17 as the hydraulic cylinder 13 and moves back and forth through a pipe 10 connected to a sampling container 18 for sampling the melt. This thrust device 16 is equipped with a torque limiter and has a structure that allows the motor to be stopped and reversed when a thrust of a certain level or more is applied to the pipe 10. By pulling back the hydraulic rod 12 having a torque limiter device, the relative length of the measuring rod 2 with respect to the pipe 10 is shortened, and the tip weight 9 at the tip is pushed out into the furnace.

When pushing out the pipe 10 while keeping the measuring rod 2 in a fixed position, the tip weight 9 applies a thrust (usually 1 to several tons of thrust) to the sample collection container 18 to displace the coke packed bed in the furnace. join. Refractory sampling containers cannot withstand this thrust. On the other hand, according to the present invention, the load on the sample collection container 18 is reduced by the frictional force between the tip weight 9 and the measuring rod 2 (10
Kg) and will not destroy the sample collection container 18. When storing the sample collection container 18 in the measuring rod, a thrust device 16 with a torque limiter is used.
Pull back pipe 10.

The upper limit torque of the torque limiter is set to a value that does not exceed the breaking strength of the sample collection container, usually corresponding to a thrust of 10 to several tens of kilograms. Sample collection container 18
Even if coke gets caught between the inside and the measuring rod and it becomes impossible to retreat, it will stop in that state and the melt can be recovered without damaging the sample collection container 18.

FIG. 6 shows a motor with a torque limiter which is a representative example of the thrust device with a torque limiter in this embodiment. A torque set bolt controls the holding force on the gear shaft, allowing the gear to disengage at a constant torque.

FIG. 5 shows a modification of the present invention. The present invention can protect the sample collection container by a combination of a thrust device for moving the measurement rod and a thrust device for the sample collection container that is independent of the movement of the measurement rod. Not determined.

In FIG. 5, the cylinder for moving the measuring rod 2 is also used as a drive device for inserting the measuring rod to the measurement position.

At the rear end of the pipe 10, a hydraulic or pneumatic cylinder 21 with a pressure setting device (relief valve) compatible with the thrust device with the torque limiter device shown in FIG. 1 is attached. The cylinder 21 is connected to a sample collection container chuck 19 connected to a guide rod 20 fixed to the guide frame.

After inserting the measuring rod 2 to the measurement position with the sample collection container chuck 19 loosened, the sample collection container chuck 19 is tightened and fixed with the guide rod 20. When the hydraulic cylinder 13 is retracted in this state, the sample collection container 18 is pushed into the furnace by the pipe 10. When storing the sample collection container 18, the rear cylinder 21 is pulled back.

The sample collection container cylinder 21 is equipped with a relief valve that can set the pressure, and when a thrust greater than the destructive force is applied to the sample collection container, the relief valve is activated to prevent thrust greater than the destructive force from being applied. There is. Therefore, a hydraulic or pneumatic cylinder 21 with a pressure setting device (relief valve) is required.
is equipped with a torque limiter device, similar to a motor with a torque limiter.

[Effect of idea]

By using the device of the present invention, it is possible to sample molten materials such as slag and metal in the tuyere and melting zone of an operating coke packed bed reactor without damaging the sample collection container. In a reactor such as a blast furnace, by knowing the pig iron components and slag components in the operating furnace, it is possible to predict the components of the hot metal product in advance. Combining the results of the device of the invention with, for example, powder (iron oxide, coal, etc.) technology from the tuyere allows rapid adjustment of hot metal temperature, composition.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a charge sampling device according to an embodiment of the present invention, Fig. 2 is a partially cutaway side view of the entire measuring rod equipped with the sampling device of the present invention, and Fig. 3 is a partially cutaway side view of the measuring rod. FIG. 4 is an explanatory view showing the operation of the melt sampling device, and FIG. 5 is a side view of another embodiment. FIG. 6 shows the structure of the motor with a torque limiter of this embodiment. 1... Coke packed bed, 2... Measuring rod, 3...
Ball valve, 4...Gland packing, 5...Guide roller, 6...Dolly, 8...Guide frame, 9...Tip closure, 10...Pipe, 12...
...Hydraulic rod, 13...Hydraulic cylinder, 14...
Load receiver, 15... Seal portion, 16... Thrust device with torque limiter device, 17... Truck base, 1
8...Sample collection container, 19...Chick, 20...
... Guide roller, 21 ... Cylinder for sample collection container, 22 ... Chain, 23 ... Sprocket,
30... Measuring device, 31... Torque set bolt, 32... Motor output shaft, 33... Gear shaft, 3
4...Movement axis.

Claims (1)

[Scope of utility model registration request] 1. A device for sampling molten material dripping from a tuyere in a packed bed of a vertical furnace filled with lumped solids, comprising: a thrust device which stores a sample collection container in the tip of a measuring rod so as to be movable back and forth, advances the measuring rod body to a sampling position and retreats it to expose the sampling container at the sampling position, a tip closing device which is removably inserted from the tip of the measuring rod into a hole through which the sampling container enters and exits, protects the sampling container from collision with the contents inside the furnace when the measuring rod body advances back and forth, and falls out of the tip of the measuring rod when the measuring rod body retreats, and a thrust device with a torque limiter device which moves the sample collection container back and forth independently of the movement of the measuring rod.