JPS58221208A - Measuring device for inside of blast furnace - Google Patents

Abstract

PURPOSE:To obtain various kinds of information in the inside of a blast furnace from the same spot in the furnace by providing a probe for measuring the inside of the furnace freely movably in and out at a suitable angle of oblique movement from the barrel or bosh part of the furnace. CONSTITUTION:A probe for measurement is provided movably in and out at 10-40 deg. angle of oblique movement by means of a base 19 fixed to a shell 18 as a support in the barrel or bosh part of a blast furnace. The apparatus at the forward end of the probe are formed of two shutoff valves 20, an expansion 21, a sealing mechanism 22, etc. The apparatus at the forward end except the shutoff valve on the furance body side are removed by removing flange coupling parts 23, 24 in the stage of sampling raw materials. The sampling probe is inserted at a prescribed angle in the furanace to sample the raw materials. Necessary apparatus are installed to the forward end of the probe to measure the temp. and components of gas, etc. A non-water cooled probe or small diameter probe is mounted to this measuring device according to need to obtain the information in the lower part of the furnace, so that the blast furnace is operated stably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blast furnace in-furnace measuring device for realizing stable blast furnace operation at a high level based on furnace lower part information by in-furnace measurement near the root of the cohesive zone in the lower part of the furnace.

The cohesive zone has long been attracting attention as an important element governing gas flow and heat transfer in a blast furnace.

Among these, the condition of the cohesive zone near the furnace wall, called the root, is particularly important as a factor controlling the smoothness of the descent of the charge and the flow of gas on the furnace wall. Estimation has been attempted in the past, but there are problems with accuracy. The limit has been reached.

In addition, in recent years, in the operation of large blast furnaces aiming for low fuel ratios and high efficiency, detailed information on the lower part of the furnace, centering on the roots of the cohesive zone, has become important. A measuring device is needed to obtain the information.

However, the lower part of the blast furnace is at high temperature and pressure, and is subject to adverse conditions such as dust in the furnace and hot metal dripping ring. In order to avoid deterioration of the seal mechanism during insertion, there are many problems, and in order to realize an advanced equipment structure for sampling raw materials with the same device, efficient information collection and It was necessary to consider how to balance safety.

The present invention focuses on this point, and uses a charging device with an optimal insertion angle to provide a blast furnace that can obtain various types of furnace information such as gas temperature, component measurement, and cohesive zone sampling from the same point in the furnace. The present invention provides an in-furnace measuring device.

This will be explained in detail below with reference to the drawings.

Figure 1 shows a model of the area near the root of the cohesive zone calculated from blast furnace dismantling surveys conducted to date, literature, etc. 1st
In the figure, the root of the cohesive zone 2 normally exists from the hearth to the morning glory, and the angle θ with the horizontal plane is 7 on average.
It is around 0°. The position of the root does not change significantly in the long or short term during steady operation.

Further, the furnace core 3 exists parallel to the welded cohesive zone.

From these, the most efficient method (in order to collect information inside the furnace) is to install the charging device at the furnace belly or in the morning glory part, and at an insertion angle of θ where the probe is perpendicular to the cohesive zone 2 and the furnace core 3. -2
It turns out that it is around 0°, which allows measurement with the shortest insertion length.

FIG. 2 is a detailed modeling of the cohesive zone 2 in FIG. The fused ore layer 4 and the coke layer 5 have descended to the furnace belly level while maintaining their open layer state, and both from the profile design of the blast furnace and from the results of the dismantling investigation, the layers are at the furnace belly level. It is almost horizontal. In order to sample this layer state, an angle that penetrates at least three layers is required,
In FIG. 2, 12/1. Since it can be modeled as 0.19, the desired minimum inclination angle θ2θ2 = stn
-'(0,19) -11° can be calculated.

By the way, when sampling the coke layer, if the angle of inclination is too large, it is not preferable because it will cause the sample to fall when being pulled out of the furnace after sampling. The inventors conducted several experiments,
According to studies, if the angle of inclination exceeds 40°, falling of the material can be avoided even if the probe is devised, and the maximum allowable inclination angle is determined to be 40°.

Taking all of the above into account, it can be seen that the allowable inclination angle θ in FIG. 1 needs to be 10°<θ<40°, and that the optimum angle is around θ-20°.

When measuring gas temperature, components, etc. during operation, the following problems arise: 1. High temperature and high pressure; 2. High possibility of dripping of hot metal; and 2. Large raw material load. Water-cooled probes are usually used when measuring at high temperatures, but there is a possibility of water leakage due to localized thermal shocks such as dripping of hot metal. It is necessary to improve the coefficient, and the probe becomes larger. However, the furnace belly and morning glory are the most important parts of a blast furnace, and in order to maintain thermal protection and mechanical strength, it is desirable to make the diameter of the openings as small as possible.

For the above reasons, the probe should be non-water cooled and small in diameter. However, there are concerns about the heat of the probe, deformation of the main body due to the load of the raw material, and melting and deformation of the probe surface due to hot metal. There is a strong possibility that overloading and destruction of the steel shell and advanced equipment when leaving the house will result in deterioration and destruction of sealing mechanisms such as glands and seals. Therefore, in order to prevent these problems, it is necessary to have a structure in which the part of the probe inserted into the furnace can be dumped into the furnace with a measuring diameter.
Small diameter, split type.

In FIG. 3, 6 is the in-furnace dumping part of the probe, 7 is the recovery part, and 13 is a cross section of the divided part of the probe outer cylinder. The divided part is composed of a fitting part 8 of the probe outer cylinder and a fitting part 9 of the internal gas zan printer piping. It is necessary that the fitting parts 8 and 9 have appropriate sealing properties and a fitting force that is equal to the probe restraining force in the furnace, and when this condition is met,
Reliable splitting properties can be obtained when pulling out Zorobe.

By providing a thin wall portion 10 on the furnace wall portion of the probe where shearing force is generated due to the falling of the raw material, deformation of the portion inserted into the furnace is facilitated, which further improves the probe restraining force within the furnace and allows for more reliable separation. You can get sex. It is also preferable to perform forcible division using hydraulic pressure, compressed air, etc., but according to the studies of the present inventors, it is possible to obtain sufficiently satisfactory division performance with only the thin part 10 and the fitting structure. It's clear.

In addition, if the thermocouple is cut off at a completely different location from the probe division part 13, there is a large possibility that the thermocouple may be jammed into the shutoff valve, causing damage to the insertion device. It is necessary that the pair 11 also have a joint 12, such as a connector, for selective separation near the probe division 13.

FIG. 4 shows the tip of the raw material sampling probe. Fix the core J5 to the outer cylinder] 4 at the position shown in FIG.
By retracting the probe to create a space at the tip of the outer cylinder, and further inserting the entire probe, the raw material will be pushed into the space. When the insertion inclination angle θ of the probe is 30° or more, it is necessary to use the fall prevention plate 17 to prevent the raw material from falling after sampling, but the area ratio of the fall prevention plate 17 to the cross-sectional area of the outer cylinder is If it exceeds about 10%, it will impede the entry of raw materials, so care must be taken.

FIG. 5 schematically shows the structure of the advanced device. Two shutoff valves 2o are installed using a base 19 fixed to the blast furnace shell 18 as a support.
, an exno ξ-tion 21 and a seal mechanism 22 are installed. These mechanisms are indispensable when inserting a split Zorobe to measure gas temperature and components during operation, but when sampling raw materials during wind breaks, equipment damage may occur due to a small amount of raw material falling into the advanced equipment. This is undesirable because it causes deterioration of the sealing performance of the shutoff valve, and deterioration of the sealing mechanism due to the sampled material protruding from the tip of the probe and the roughened probe surface.

Therefore, when sampling raw materials, it is necessary to remove, for example, the flange joints 23 and 24, leave only the cutoff valve on the furnace body side, and remove the leading-edge equipment. At this time, it is practically impossible to attach and detach heavy objects after a long period of work, so it is desirable that the advanced equipment shown in FIG. 5 be made as light as possible and as compact as possible.

Furthermore, when checking the accuracy of advanced equipment installation after equipment installation work before the end of the wind break, the top, bottom, left and right level confirmation markers 26 make it easy to check, and the level adjustment of the advanced equipment can be done easily. It is desirable that the structure is such that the level can be adjusted using the spring 25. Also,
It is also preferable that the guide hardware 27, which is the joint part with the blast furnace shell 18, has a water cooling function in order to actively protect the shell.

6 and 7 show an embodiment of the present invention.

The angle of inclination is 25°, and the installation location is in the belly of the furnace. In FIG. 6, the traveling frame 30 is fixed to the supports 28 and 29, and the probe 31 supported by the carriage 32 and guide rollers 34 in the frame is inserted into the furnace, and the split type probe shown in FIG.
Gas temperature, component measurement, raw material sampling, etc. are carried out using the raw material sampling probe shown in FIG.

FIG. 7 is an explanatory diagram of the traveling frame and the truck. The probe 31 is supported within the traveling frame 30 by guide rollers 34 and a probe mount 39 fixed to the trolley 32. At this time, it is desirable that the guide roller 34 and the probe mount 39 have a vertical adjustment function in order to adjust the level with the advanced device. When the trolley 32 is at rest, the traveling frame 3
A bogie stopper 33 provided at 0 and a stopper receiver 40 fixed to the bogie 32 are coupled to prevent the bogie from moving forward due to its own weight. The truck 32 is a self-propelled type having a hydraulic motor 36, and driving force is obtained as a reaction force from the traveling frame 30 by a rack and pinion 35 provided within the traveling frame 30.

The straight movement of the truck 32 is ensured by the wheels 37 of the truck and the track 38 provided on the traveling frame 30. For safety, it is also preferable to provide a mechanical stopper 39 at the permissible limit of forward movement and backward movement.

As described above, the blast furnace internal measuring device of the present invention sets a course at a predetermined insertion angle for measuring inside the blast furnace to understand the internal situation of the blast furnace, and uses a non-water-cooled, small diameter, split type probe.
In addition to measuring the gas temperature and components from near the root of the cohesive zone to near the furnace core, the same insertion device measures multiple layers of raw materials in the furnace centered around the cohesive zone, which is composed of alternating ore and coke. This makes it possible to easily and quickly observe the state of gas flow and reduction near the cohesive zone, which is the most volatile area in the furnace, and to collect data from the same point. By understanding the relationship between the particle size, strength, and reduction state of the collected raw material in multiple layers centered on the cohesive zone, it is possible to understand the actual state of the reaction system in the lower part of the furnace.
Understanding the chronological changes in the root of the cohesive zone will contribute to high-level stable operation of blast furnaces.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of how to determine the optimal insertion angle for modeling the root of the cohesive zone inside the blast furnace and the lower part of the blast furnace based on the results of demolition surveys, etc. Figure 2 shows the ability to collect multiple layers of the cohesive layer inside the blast furnace Fig. 3 is an explanatory diagram of the split type probe, Fig. 4 is an explanatory diagram of the raw material sampling probe, Fig. 5 is an explanatory diagram of the configuration of the tip device provided removably, and Fig. The figure is an explanatory diagram of one embodiment of the present invention, and FIG. 7 is an explanatory diagram of the traveling frame etc. in FIG. 6. l: Blast furnace 2: Modeled cohesive zone shape 3, modeled furnace core shape 4: Cohesive layer 5: Coke layer 6: Probe in-furnace dumping section 7: Recovery section 8 Fitting of nib rope outer cylinder Part 9゜ Fitting part of gas sampling pipe Thin wall part of JO nib probe outer cylinder Jl: Thermocouple 12: Thermocouple joint 13: Entire divided group J4 nib rope outer cylinder 15: Core 16: Rod for core movement 17: Plate to prevent raw material from falling 18゛Blast furnace shell 19: Base fixed to the shell 20: Shutoff valve 21: Extract, 9! tion 22
: Seal mechanism 23. 24: Advanced equipment coupling part 25, level adjustment spring 26: Level confirmation marker 27: Guide hardware 28. 29: Traveling frame support 30: Traveling frame 31: Zorob 32; Cart 33: Cart stopper 34 Ni guide roller 35: Rack and upper 0 onion 36: Hydraulic motor 37: Wheel 38: Track 39: Stopper 40: Stopper receiver is agent Patent attorney Tatsuo Chanoki 2nd pole 3 times/j ≠ 4 figure

Claims (1)

[Scope of Claims] 1. A blast furnace in-furnace measuring device, characterized in that an in-furnace measurement survey probe is provided so that it can be inserted into and taken out from the belly or morning glory part of the blast furnace at an oblique angle of 10° to 40°. 2. The blast furnace in-furnace measuring device according to claim 1, which is equipped with a non-water-cooled probe. 3. The blast furnace in-furnace measuring device according to claims 1 and 2, which is equipped with a small diameter probe. 4 Claim 1, which is equipped with a split type probe,
The blast furnace in-furnace measuring device according to paragraphs 2 and 3. 5 Claims 1, 2, and 3, characterized in that multiple raw material layers that exist above and below a cohesive zone formed in a blast furnace are sampled in the radial direction of the furnace. Measurement device inside the blast furnace. 6. Claims 1 and 2 are characterized in that the isolation valve and gas seal device necessary for measurements during operation are detachable to prevent deterioration of the atmosphere isolation function due to work during wind breaks.
3. The blast furnace in-furnace measurement device of Items 3, 4, and 5.