JPS6140761Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application of the Invention) The present invention relates to a blast furnace shaft lower part unloading speed measuring device for measuring the unloading speed in the lower part of the shaft of a blast furnace.

(Prior technology) In order to operate a blast furnace stably, it is necessary to detect the descending velocity distribution of the charge at any position in the furnace in the height direction and radial direction, and based on this measurement value, the blast furnace air blowing conditions , it is necessary to adjust the deposition distribution of the charge in the furnace, etc.

As a device for detecting the descending velocity distribution of the blast furnace charge, conventional methods have been used, for example, to measure the surface level of the charge in the radial direction of the furnace between the blast furnace bell and the surface of the charge. Detection from the moving distance of multiple weights descending upward (Special Publication 1984-
Publication No. 18591).

However, in these methods, when the charge in the blast furnace is descending, if there are places with different descending speeds in the circumferential direction or radial direction of the blast furnace, the charge on the surface where the descending speed is slow is The charging material on the surface that flows to the surface where the descending speed is high and is deposited in the blast furnaces moves in the circumferential direction or the furnace radial direction, so the charging material actually descends in the vertical direction within that time. The descending situation and the descending speed of the charge do not match, and the accurate descending speed of the charge may not be ascertained.

In order to advantageously solve the above-mentioned drawbacks, for example, the following conventional method is available as a method for measuring the falling rate distribution within the inclusion layer in the blast furnace.

The method involves measuring at any number of correspondingly determined measurement points in the vertical direction inside multiple hollow tubes that penetrate the charge layer in parallel to the top and bottom of the blast furnace body. A method of obtaining the descending velocity distribution for each measurement by arranging a magnetic sensor at the top and bottom of the blast furnace and comparing and calculating the signals of the magnetic sensor corresponding to the above-mentioned upper and lower regions obtained as the contents in the blast furnace descend. Kaisho
53-7505).

This method measures the descending speed within the charge layer, so there is no movement of the charge in the circumferential direction or the furnace radial direction, and the accurate descending speed of the actually descended charge can be measured. The drawbacks of the previously described methods are overcome.

However, this method detects the difference in magnetic force between ore and coke and calculates the rate of descent, so it is impossible to measure in an atmosphere above the Curie point of 700 degrees Celsius, where magnetism disappears. Regarding the temperature distribution inside the blast furnace, the temperature is highest at the center of the furnace in the radial direction, and the temperature exceeds 700°C 1 m below the surface of the charge. Therefore, the measurement of the falling velocity distribution in the charge layer using the aforementioned magnetic sensor can only be carried out at a position almost directly below the charge surface.

By the way, it has been reported in past blast furnace dismantling results and experimental reactor experiments for estimating burden distribution that the descent rate distribution in the furnace radial direction is different between directly below the charging surface and in the middle and lower part of the shaft. It is known that the descending velocity distribution of the charge is greatly influenced by the level distribution and shape distribution of the separator zone in the radial direction of the furnace. Therefore, in order to obtain an appropriate separator zone level distribution and shape distribution and maintain stable operation of the blast furnace, the descending velocity distribution should be measured at a position closer to the separator zone, and based on the descending velocity distribution measurement value. It is necessary to adjust the blast furnace air blowing conditions, the deposition distribution of the charge inside the furnace, etc. In other words, the conventional method of measuring the descending speed and distribution on the surface of the burden and just below the charging surface cannot detect changes in the level distribution and shape distribution of the separator zone, making it difficult to accurately measure for stable operation of the blast furnace. Extremely difficult to connect.

(Purpose of the invention) The present invention has been made to solve the above-mentioned drawbacks. It is possible to measure velocity distribution.

(Structure and operation of the invention) In other words, the gist of the blast furnace shaft lower unloading speed measuring device of the invention is that the rear end is loosely fitted inside the tip of a horizontal pipe, and the tip that protrudes from the tip of the horizontal pipe is tapered. A probe consisting of a weight and a wire rope that is connected to the rear end of the weight, passes through the pipe, is attached to a sheave in the rear end of the pipe, and goes out of the pipe is placed in the middle of the blast furnace shaft toward the furnace core. The wire rope can be moved forward and backward, and is provided with a wire rope rear tension applying mechanism for preventing the wire rope from sagging, as well as a wire rope movement amount detector.

The present invention will be explained in detail below based on the embodiments shown in Figures 1, 2, 3, and 4.

FIG. 1 is an overall view showing the state of the device of the present invention at the start of measurement, and FIG. 2 is an explanatory view of the detailed structure of a probe supported cantilevered on a cart. Figure 3 is an explanatory diagram of the weights that make up the probe, and Figure 4 is an explanatory diagram of the weights that make up the probe.
FIG.

In FIG. 1, reference numeral 1 denotes a cart that can move forward and backward toward the furnace core on a rail 3 disposed outside the furnace in the middle part of the blast furnace shaft 2. This cart 1 is driven by a drive motor 4,
It is driven forward and backward by a reduction gear 5, sprockets 6, 6, and a power transmission chain 7. Note that 8 and 8 are running wheels of the truck 1.

Reference numeral 9 denotes a mast erected on the trolley 1, and reference numeral 10 denotes a probe that can be attached to and detached from the mast 9, the detailed structure of which is shown in FIG. The rear end of the probe 10 is flange-coupled to the mast 9 and supported in a cantilever manner, and the tip of the probe 10 is guided by a probe guide 11 provided in the shaft middle part 2, so that the tip of the probe 10 is connected to the furnace contents. It is possible to move forward and backward during the 12th year.

FIG. 2 shows the detailed structure of the probe 10, in which 13 is a horizontal pipe part, an outer pipe 14,
It is an internal water-cooled type with a triple tube structure consisting of a wire rope guide tube 15 and a partition inner tube 16 that partitions between the two tubes 14 and 15. It enters between the guide tube 15 and the partition inner tube 16, reaches the tip, passes between the outer tube 14 and the partition inner tube 16, is discharged from the discharge port 18, and is discharged from the blast furnace contents. This effectively prevents buckling due to thrust during insertion into the furnace and bending in a high temperature atmosphere when measuring the rate of descent into the furnace.

Reference numerals 19 and 20 denote a seal box and sheave built-in box which are connected to the rear end of the horizontal pipe section 13 to form a flange connection. At the joint with the box 20, wire rope guide holes are provided on an extension of the guide tube 15, and ring-shaped seal packings 21, 21 are provided in these holes. 22 is a sheave installed inside the box 20, and 23
24 is an opening provided by cutting out the box 20 above the sheave 22, and 24 is an opening provided by cutting out the box 20 above the sheave 22.
Inert gas, e.g.
This is an inert gas supply port that supplies _N2 gas.

25 has a rear end portion 25a loosely fitted into the pipe portion 13, specifically the outer tube 14, and connected to the rear end, passing through the wire rope guide tube 15,
The pipe is attached to the sheave 22 in the box 20 through the packing 21, inside the seal box 19, through the packing 21, and through the opening 23 to the probe 10, more specifically, to the outside of the box 20 under the tension of the wire rope 26. The part 13 is specifically a weight having a conical tip 25b protruding from the tip of the outer tube 14.

Reference numeral 27 denotes a connecting pipe which is flanged to the box 20, and whose rear end is flanged to the mast so that the probe 10 is supported in a cantilevered manner.

The weight 25 is, as shown in FIGS. 3 and 4,
The tip end 25a is conical, the middle part 25c is cylindrical with a U-shaped groove 28 cut on the outer periphery, and the rear end 25b is cylindrical. A groove 29 is cut for this purpose, and a pin insertion hole 30 is provided for fixing this wire ring portion with a pin.

The outer diameter of the cylindrical rear end portion 25b is about 2 mmφ smaller than the inner diameter of the outer tube 14 of the pipe 13, so that it fits loosely, and the outer diameter of the cylindrical intermediate portion 25c is the same as the outer diameter of the outer tube 14. Due to the tension of the wire rope 26, the rear end surface of the intermediate portion 25c engages and is locked with the distal end surface of the outer tube 14. Note that Figures 5 and 6 show modified examples of the weight 25. Figure 5 shows a U-shaped groove 28 cut into two stages, and Figure 6 shows a V-shaped groove 29 cut into two stages. It is.

Now, in FIG. 1 showing the state of the apparatus at the start of measurement, 30 is provided above the probe 10, and the probe 10 is
A sheave is used to hang the wire rope 26 that has reached the outside and the wire rope 42 that is connected via a coupler 41, and 31 is a counterweight support (31) attached to the wire rope 42 that hangs downward via the sheave 30 (not shown), which prevents the wire rope 26 from sagging. In other words, the sheave 30 and the counterweight 31 constitute a wire rope rear tension applying mechanism 34 that prevents the wire rope 26 from sagging.

In order to facilitate the replacement of the weight 25, the weight 25 and counterweight 31 are not made of one wire, but the weight 25 is attached to the tip of the probe.
Probe opening 2 of the wire 26 holding the
3, a connector (clip) 41 is provided at a position with a length equal to the pre-estimated pulling allowance, so that it can be quickly connected to the wire 42 on the counterweight 31 side. .
Of course, instead of such a wire rope rear tension applying mechanism 34, for example, a drum-type wire winding device whose tension can be adjusted may be employed. In this case, it can be mounted on a trolley.

Reference numerals 32 and 33 are a pointer and a position scale plate attached to the counterweight support to indicate the wire position, and the pointer 32 and scale plate 33 constitute a wire rope movement amount detector 35. Also, regarding this detector 35, for example,
It is possible to adopt a system in which the amount of feed of the wire rope is converted into an electric signal proportional to the amount of rotation of the drum, and the signal is recorded on a chart or the like.

In addition, in FIG. 1, 36 is the probe guide 11.
37 is a box with a built-in probe cutting machine, 38 is a box with a built-in probe straightening roller, 39 is a gate valve, 40 is a gate valve connected to the guide 11, and 40 is a box with a built-in probe straightening roller. This is the seal part.

The operation of the embodiment apparatus configured as above, that is, the procedure for measuring the unloading speed at the lower part of the blast furnace shaft will be explained.

With the tension of the wire rope 26, the probe 10 holding the weight 25 at its tip is moved forward in a cantilevered manner by the trolley 1, and the probe 10 is passed through the seal portion 40 and the guide 11 to a predetermined position in the furnace in the middle of the shaft. Enter the raw material inside the furnace.

At this time, since the tip of the weight 25 at the tip of the probe 10 is tapered, for example, conical, it is possible to smoothly charge the raw material into the furnace. Up to this stage, the wire rope 26
For example, by wrapping and fixing on a truck, rearward tension is applied. Further, the rope 42 on the counterweight 31 side is connected with a wire rope (not shown) so as to be in a sheave state.

Next, the wire rope 26 is released from tension, the trolley 1 is driven slightly backward, and the probe 10
The pipe portion 13 is moved back. At this time, the weight 25 is loosely fitted into the outer tube 14 of the probe 10, and the wire rope 26
is tension-free, and since the groove 28 or 29 is cut on the outer periphery of the weight protruding from the tip of the probe 10, only the pipe portion 13 is retracted.
The weight 25 will remain in that position.

Next, after confirming that the wire rope 26 coming out of the probe 10 has been slightly retracted, the wire rope 26 and the wire rope 42 are
are connected via a coupler 41, and a required number of counterweights 31 placed in advance on a weight support at the rear end of the wire rope 26 eliminates slack in the wire rope 26. This state is the state shown in FIG.

By the above-mentioned operation of inserting the weight 25 into the furnace, the weight 25 naturally falls from the middle part of the shaft toward the bottom of the shaft as the raw material in the furnace descends, and this natural fall amount is caused by applying rearward tension to the wire rope 26, causing the wire rope to slacken. By reading the amount of descent of the weight 25 per unit time on the scale plate 33, which is sequentially displayed by the pointer 32 and the scale plate 33, the rate of descent of the contents in the furnace in the temperature range of 700°C or higher, In other words, the unloading speed at the bottom of the shaft can be detected.

Of course, by selecting various loading and stopping positions of the weight 25 in the furnace radial direction, it is possible to measure the shaft lower unloading speed at each position in the furnace radial direction.

Note that when the weight 25 reaches the cohesive zone level,
Since the connecting wire 26 is melted and the wire movement stops, once this has been confirmed outside the furnace, the wire rope 26 near the probe is manually pulled back by an amount equivalent to the amount of movement (the amount of descent into the furnace).

Next, remove the coupler 41 of the wire rope 26 and disconnect the wire rope 42 on the counterweight 31 side.
After cutting the wire and wrapping it on the trolley, the probe is moved back from the inside of the furnace to the outside of the furnace by the backward drive of the trolley.
Valves 11 and 14 are closed to complete the evacuation. At this time, the counterweight is suspended and held by a sheave by a wire (not shown) connected to the wire rope 42.

The next measurement is carried out by pulling out a new wire from the tip of the probe, connecting it to a new weight, and inserting it into the furnace using the procedure described above.

(Effects of the invention) As detailed above, according to the invention, it is possible to accurately measure the rate of descent at any position in the radial direction of the furnace in the high-temperature part of the contents in the furnace, and this measurement result Based on this, it becomes possible to appropriately adjust the blast furnace air blowing conditions, charge deposition distribution, etc., and it is possible to perform stable blast furnace operation over a long period of time.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the overall configuration of an embodiment of the device of the present invention showing the state at the start of measurement, Fig. 2 is a detailed explanatory diagram of the structure of the probe, and Figs. 3 and 4 are explanatory diagrams of the form of the weight. 5 and 6 are explanatory diagrams of other embodiments of weights. 1: Bogie, 2: Middle part of blast furnace shaft, 3: Rail, 4: Drive motor, 5: Reducer, 6: Sprocket, 7: Chain, 8: Wheel, 9: Mast, 1
0: Probe, 11: Probe guide, 12: Furnace contents, 13: Internal water-cooled horizontal pipe section, 1
4: Outer tube, 15: Wire rope guide tube, 16:
Partition inner pipe, 17: Water supply port, 18: Drain port, 19:
Seal box, 20: Box with built-in sheave, 2
1: Ring-shaped seal packing, 22: Sheave, 2
3: opening, 24: inert gas supply port, 25: weight, 25a: rear end, 25b: conical tip, 26: wire rope, 27: connecting pipe, 28:
U-shaped groove, 29: V-shaped groove, 30: Sheave, 3
1: counterweight, 32: pointer, 33: scale plate, 34: wire rope rear tension applying mechanism,
35: wire rope movement amount detector, 36: gate valve, 37: box, 38: box, 39:
Gate valve, 40: Probe outer seal portion, 41:
coupler.

Claims (1)

[Scope of utility model registration request] The rear end is loosely fitted inside the tip of the horizontal pipe, and the tip protruding from the tip of the horizontal pipe is connected to a tapered weight, and the weight is connected to the rear end of the weight, passing through the pipe and inside the rear end of the pipe. A probe consisting of a wire rope mounted on the sheave and extending outside the pipe can be moved forward and backward toward the furnace core in the middle of the blast furnace shaft, and a wire rope rear tension applying mechanism is attached to prevent the wire rope from sagging. A blast furnace shaft lower unloading speed measuring device, characterized in that it is also equipped with a wire rope movement amount detector.