JPS60213845A - Inside examining apparatus of vertical furnace - Google Patents

Abstract

PURPOSE:To make it possible to grasp phenomena accurately by providing a forward and backward driving device, which drives a probe that can be freely inserted in and removed from a vertical furnace through a tuyere back and forth, and providing a universal tilting device, which tilts the driving device in the horizontal and vertical directions with the tuyere part as the center. CONSTITUTION:A chuck table 7, i.e., a moving table, is fixed to cylinder rods 6a and 6b of driving cylinders 5a and 5b. A chuck cylinder is mounted on the chuck table 7 in the perpendicular direction with respect to the axis of a probe 1. An ordinary chuck is attached to the tip of the cylinder rod of the chuck cylinder. The probe 1 is gripped by the chuck. The probe 1 is moved forward and backward by the operation of the driving cylinders 5a and 5b. By changing the heights of hydraulic cylinders 9a and 9b and hydraulic cylinders 9c and 9d, a forward and backward driving device 19 is tilted, and the inserting direction of the probe 1 is changed in a vertical plane. Rolls 10, which are attached to the lower end of a frame 8a can be moved along guide grooves 12 in the circumferential direction with respect to the main body of the blast furnace. The probe 1 can be moved in a horizontal plane.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves inserting a probe into and near the tuyere raceway of a vertical furnace such as a blast furnace, direct reduction furnace, etc., and measuring furnace contents, gas, temperature, etc. This invention relates to a device for exploring the inside of a vertical furnace for sampling and observing the inside of the furnace.

This will be explained below using a blast furnace as an example.

The flow state of melts and solids near the blast furnace raceway has long been an issue that has been desired to be clarified in order to elucidate phenomena such as melting of the siding and slag return to the tuyere.

It is generally considered difficult to insert a probe during operation because this area is high temperature, is filled with a coke layer, and is subject to a locally large heat load due to flowing molten iron. However, conventionally, as shown in Figure 4, a water-cooled pipe was inserted into the raceway space from the tuyere during air blowing as a blade lobe during blast furnace operation.

There were so-called raceway probes that measured the composition and temperature of gases. (Utility Model Publication No. 53-133685) Such a raceway probe l provides information regarding the gas composition and temperature within the raceway space in region A where the probe is inserted and moves, that is, a narrow region on the central axis of the tuyere. However, the movement of melt and solid in the space other than this A region and the region filled with coke, the gas composition,
Information about temperature etc. cannot be obtained ζ, and the tuyere cross-sectional area becomes smaller due to probe insertion, so the original raceway space cannot be obtained.

In recent years, methods such as injecting pulverized coal from the siding have been attempted at steel mills around the world. Under these circumstances, the behavior of solids and melts in and around the tuyere raceway will affect the efficiency of the entire steelmaking process, and the reactions and melting in and around the raceway will be more important than ever. Technology to detect and control liquid flow phenomena will become important.

The present invention is aimed at responding to such technological developments and eliminating the shortcomings of the conventional technology. Equipped with a probe that can be inserted into and removed from the furnace at will, an advancement/retraction drive device that moves the probe forward and backward, and a free tilting device that tilts the advancement/retraction drive device horizontally and vertically around the tuyere. be.

That is, a probe equipped with a forward/backward drive device and a free tilting device is installed, and the air blowing from one tuyere during operation is stopped, and the probe is moved from this tuyere to any position within the adjacent raceway and the coke packed bed around it. A vertical type that allows this probe to be inserted to collect charges, gas, dust, temperature, melted materials, etc., as well as observe the inside of the furnace using a fiber scope, making it possible to perform various observations, measurements, and sample collection. This is a device for exploring the inside of a furnace.

With this device, it is possible to insert a probe at any three-dimensional position within the coke packed bed, including inside the raceway, and to analyze the temperature distribution, gas composition distribution, pressure distribution, and melting temperature distribution within and around the raceway. It is possible to explore the distribution of the amount of dripping in the body and observe the swirling of coke and the flow of melt. This makes it possible, for example, to clarify the flow state of melt and solids near the blast furnace raceway, elucidate phenomena such as tuyere melting and tuyere slag, and prevent these from occurring. Ta. In addition, by obtaining information such as temperature, pressure, gas composition, composition of melt, and flow of melt in and around the raceway, we can investigate reactions and melt flow phenomena in and around the raceway. By elucidating the mechanism behind this, it has become possible to control blast furnace operations more highly.

An embodiment of the apparatus of the present invention is shown in FIGS. 1 and 2. The probe l is moved forward and backward by two sets of drive cylinders 5a, 5b, cylinder rods 6a, 6b, and chuck stand 7 parallel to the probe axis.
and driven by. That is, the drive cylinder 5a,
A chuck stand 7, which is a moving stand, is fixed to the cylinder rods 8a and 6b of 5b, and the probe 1 is mounted on this chuck stand 7.
A chuck cylinder is mounted in a direction perpendicular to the axis of the chuck cylinder, and a normal chuck (gripping tool) is attached to the tip of the cylinder rod of this chuck cylinder, which grips the probe l and operates the drive cylinders 5a and 5b. The probe 1 is moved forward or backward by the arrows. The drive system for this probe l does not necessarily have to be a hydraulic cylinder, but may also be a chain drive system.

A device having these structures is referred to as a forward/backward drive device 19. The forward/backward drive device 19 is mounted on the frame 8, and the lower end of the frame 8 is equipped with hydraulic cylinders 9a, 9b, 9c, and 9d whose portions contacting the lower surface of the frame can freely tilt.
is attached so that it can expand and contract in the vertical direction. These hydraulic cylinders perform level adjustment and tilting of the frame 8, namely hydraulic cylinders 9a, 9b and hydraulic cylinder 9c.
.

By changing the height of 9d, the forward and backward drive device 1
9 to change the insertion direction of the probe 1 in the vertical plane. A frame 8a and a roll 10 are attached to the lower ends of the level adjustment and tilting hydraulic cylinders 9a, 9b, 9c, and 9d, and the roll 10 moves in the circumferential direction with respect to the blast furnace main body along the guide groove 12. It is possible to do so. As shown in FIG. 2, this makes it possible to move the forward/backward driving device 19 for the probe 1 in the circumferential direction with respect to the furnace body, and in turn, the probe 1 can be moved in a horizontal plane. By means of a free tilting device 11 which tilts the probe 1 and moves it circumferentially relative to the blast furnace body, it is possible to insert the probe anywhere in and around the adjacent raceway. In this case, the blow vibe 2, gas on-off valve 3, and gas seal device 4 also move together. In this case, the inner surface of the blade rotor casing 20 and the tip of the blow pipe 2 are in spherical contact, and even if the probe l is tilted horizontally and vertically around this spherical contact, there is no gas leakage. It has a structure.

When the probe is inserted into the contents of the reactor by the advancing/retracting drive device 19, the probe receives a reaction force.

A frame 8, on which a reciprocating drive device 19 is mounted against this reaction force, is fixed to the blast furnace wall via a universal joint 13 and connecting rods 14 and 16. Since the length of the connecting rod 14.16 changes when the probe 1 is tilted horizontally or vertically, this fixation is adjusted by interposing a hydraulic cylinder 15 in the middle of the connecting rod 14.16.

Gas leakage inside the furnace is prevented by the blow pipe 2. The blow pipe 2 includes a universal joint 13 and a hydraulic cylinder 17. It is fixed by a connecting rod 18.

When the air blowing of any one tuyere is stopped and the probe is inserted at any position in the coke packed bed including the adjacent tuyere raceway, the above device does not necessarily have to be continuously moved during operation. . For example, the device may be set in advance to insert the probe at a predetermined arbitrary position using the above function during a wind break.

Next, using the in-furnace exploration device of the present invention, while the blast furnace is in operation, the air blowing from one tuyere is stopped and the probe is inserted at any position in and around the adjacent tuyere raceway. Explain how.

Figure 3 shows one tuyere that stops blowing air during operation. A blind flange 27 is attached to the lower end 2- of the upper bend 26 of the blowing branch pipe to stop the blowing of air from one tuyere. Next, the throat 29. Remove blow pipe 2. After removal, as shown in FIG. 1, the blow pipe 2, gas on-off valve 3, and gas seal device 4 are connected and fixed by a universal joint 13, a hydraulic cylinder 17, and a connecting rod 18. Thereafter, as shown in FIG. 2, the apparatus for investigating the inside of a furnace according to the present invention inserts a probe into any position within the coke packed bed, including the inside of the raceway, and performs various observations, temperature measurements, sample collection, etc.

Next, the effects of the device of the present invention will be explained by giving examples.

The apparatus for in-furnace exploration according to the embodiment of the present invention shown in FIG. 1 was installed in a #24 tuyere front cast bed of a real blast furnace having an internal volume of 2,800 g. #
The 24 tuyeres were blinded as shown in Figure fi3, and the air blowing was stopped.

#23 adjacent to this tuyere. A probe was inserted at any position within the coke packed bed, including within the raceway of the #25 tuyere. The probe is a triple tube (outer tube 60A, middle tube 40A)
, Inner pipe 10A) In a water-cooled system, observing the swirling and combustion conditions of coke in the raceway and the flow of molten material between the raceways using a fiberscope;
It has functions that allow temperature measurement and sampling of molten materials, gases, etc.

The probe is inserted into any position in the vicinity of the raceway by a fully hydraulically driven, chuck gripping and retracting drive device with a maximum thrust of lOt.

Due to the stoppage of air blowing, the insertion thrust against the coke packed bed near the raceway was approximately 3 to 4, and the fixing method of the present invention sufficiently withstood and functioned against the reaction force during insertion and withdrawal.

Next, as shown in FIG. 2, the probe is driven in the forward and backward directions with respect to the furnace body. The tip of the probe was moved in the circumferential direction with respect to the furnace body by a roll attached to the lower end of the advancing/retracting drive device, and inserted into an arbitrary position near the raceway. In this example, the maximum value of 0 was 15'. Further, the maximum tilt angle in the vertical direction is the same as the horizontal maximum tilt angle θ. However, the tilting angle θ can be made even larger by modifying the Kirikasu 20 and the doco and increasing the diameter.

The position of the tip of the probe inserted into the furnace can be determined by the following equation.

(1) When tilting only in the horizontal direction with respect to the tuyere level axis X1 = LCO5θs + Yt = Lsinθ1 (2)
When tilting only in the vertical direction with respect to the tuyere level axis LCO5θ21 Y3=Lsinθ22) Position on the horizontal plane
C2 is the tilt angle (0) in the vertical plane.

The length L of the probe inserted into the furnace can be determined from the distance L1 to the rear end of the probe and the total length L0 of the probe, using the tip of the cutter 20 as a zero point reference, and L=L0-L. Further, the probe tilt angles in the horizontal and vertical directions can be determined using electrical signals by installing a known angle meter in the cutting force doco 21 section.

Figure 5 shows an example of the results of temperature measurement and sampling of gas and melt by inserting a probe into any position in and around the tuyere raceway adjacent to any tuyere where air blowing has stopped as described above. .

With conventional technology, data could only be collected at the tuyere level in the raceway and only in the radial direction of the furnace, gas composition, and pressure. Therefore, in the prior art, phenomena such as reactions, amount of melt, and flow in and around the raceway were elucidated using Lebel's data. The accuracy was too lacking to elucidate the phenomenon mechanism of the whole raceway neighborhood using 1-level data.

Figure 5 shows the temperature, melt dropping rate, and CO1CO vertically downward at a position 1000 mm from the tip of the raceway blade.
This shows the distribution of 2. Arrows indicate the position of the raceway wall.

With the device of the present invention, data such as temperature, gas composition, amount of melt, pressure, etc. can be collected two-dimensionally as shown in Figure 5, and phenomena in and around the raceway can be accurately grasped. Now I can do it.

The present invention can further clarify phenomena in the vicinity of the raceway, and brings about significant effects that contribute to blast furnace operating technology.

[Brief explanation of drawings]

Figures 1 and 2 are a side view and a plan view of an embodiment of the apparatus of the present invention, Figure 3 is an explanatory diagram for explaining the method of charging the apparatus of the present invention into a blast furnace, and Figure 4 is a conventional FIG. 5 is a longitudinal cross-sectional view of the vicinity of the tuyere showing the probe of the present invention, and FIG. l...Probe 2...Blow pipe 3...Gas on/off valve 4...Gas seal device 5 (5a, 5b),
9 (9a, 9b, 9c. 9d), 15.17...Hydraulic cylinder 6 (6a, 6b
)...Cylinder rod 7...Chuck stand 8, 8a
... Frame lO ... Roll 11 ... Universal tilting device 12 ... Guide groove 13 ... Universal joint 14.16
, 18... Connecting rod 19... Advance/retreat drive device 20... Kirikasu 21...
・Kiriki Sudoko 27...Blind flange applicant Kawasaki Steel Co., Ltd. agent Patent attorney Yoshio Kosugi Patent attorney Kazunori Saito Figure 3

Claims (1)

[Claims] l A pipe that can be inserted into and removed from the tuyere of the vertical furnace;
1. An apparatus for investigating the inside of a vertical reactor, characterized by comprising a forward/backward drive device for moving the probe forward and backward, and a free tilting device for tilting the forward/backward drive device horizontally and vertically about a cuff.