JPH0360882B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention measures at least one of the temperature, gas composition, gas pressure, etc. of a vertically packed reaction bed, such as a blast furnace, and measures the temperature in the reaction bed. The present invention relates to a method of detecting a condition.

[Conventional technology]

Conventionally, various sondes have been proposed to detect the physical and chemical dynamic behavior in a blast furnace and to understand the situation inside the blast furnace.

Examples of these conventional techniques include the following techniques.

As shown in Japanese Unexamined Patent Application Publication No. 49-4591, a so-called horizontal sonde is provided so as to be freely displaceable in the radial direction of the blast furnace.

A measuring probe as shown in Japanese Patent Application Laid-Open No. 54-114402 is attached with a weight and sent into the blast furnace, and measurements are taken at the landing point of the weight, and measurements are continued sequentially as the load is unloaded. So-called flexible top charging vertical sonde.

A so-called rigid vertical sonde, as shown in Japanese Patent Publication No. 47-43721, is a rigid sonde inserted vertically from the furnace top and lowered as the load is unloaded.

As in Japanese Patent Publication No. 57-48621, a rigid support with a plurality of measuring elements attached to it is placed from the top of the furnace along the slope of the furnace top, and the measuring elements are sequentially installed as the charged raw materials are unloaded. to lower, so-called,
Vertical sonde buried in the top of the furnace.

However, these conventional techniques have the following problems.

[Problem that the invention seeks to solve]

Although the measurement location of the horizontal sonde is accurate, the bending stress that counteracts unloading inside the furnace adds to the equipment, making the equipment large-scale and expensive. Furthermore, if you want to accurately know the temperature distribution in the vertical direction, you will need multiple sondes in the vertical direction, and the sonde installed below the furnace will be huge and will obstruct unloading, increasing equipment costs.

The flexible top-charging vertical sonde of
As pointed out in Publication No. 16917, the landing point is inaccurate, and furthermore, because the unloading speed in the direction of the furnace height is different, the wear length of the probe and the descending length of the measuring element are inconsistent, making it inaccurate. Therefore, the descent position is inaccurate.

As pointed out in Japanese Patent Application Laid-Open No. 57-16917, the rigid type vertical sonde also has a measurable range limited to the vicinity of the furnace wall due to its relationship with the raw material charging device, and the device is large and expensive.

The furnace top-embedded vertical sonde is an excellent invention in that it solves the above-mentioned drawbacks.

However, even in this case, there are the following problems.

a. In order to place the material along the slope of the furnace top, when the raw material is charged, it slides toward the center of the furnace, making accurate positioning difficult. To prevent this slippage, the rigid support must always be approximately the same as the furnace top radius. Therefore, as explained in the specification of this prior art, the method of inserting the probe is relatively simple for measurements after the wind has stopped, but in order to make it a device for regular measurements, it is necessary to insert the probe at the top of the furnace. It is necessary to install a fairly large-scale probe loading device.

b. In the case of the bell type, it takes about 2 minutes from dumping of raw material to the next dumping, and extremely large-scale equipment is required to keep the probe horizontally as determined.

c Also, the flexible lead part (wire, thermocouple lead wire, and flexible tube) of this prior art
Due to the relationship with the raw material charging device, it will descend down the furnace wall as shown in Figure 2.
Since the unloading speed at the furnace wall is generally different from the average unloading speed in the furnace, a relative speed difference occurs between the flexible part and the rigid part, which causes the flexible pipe part to break.

d Even if it is desired to measure the lower part of the furnace, it is necessary to lower the probe from the upper part, and the length of the probe is wasted.

e In addition, in this conventional technology, the descending position of the measuring element is estimated using the worn length of the flexible lead part and the descending speed, but in this case, the descending length is longer as it gets closer to the lower part of the furnace. As a result, the estimation error becomes large, making it difficult to accurately determine the position of the probe in the reactor.

For example, when the probe is lowered as the charged material is unloaded, the speed of unloading at the upper and lower parts of the furnace is different, so the probe is lowered as shown in FIG. 5 of the drawings attached to this specification. As the probe bends and the length of the probe's descent within the furnace increases, the error increases, making it difficult to accurately determine the probe position.

The present invention was made with the aim of solving the problems of the prior art described above, and is a method that allows the situation of the vertically packed reaction layer to be grasped at any time both in the height direction and in the radial direction. The purpose is to provide

Still another object of the present invention is to provide a method of grasping the inside situation of a reactor using a simple charging device without providing a large-scale probe charging device.

[Means for solving problems]

In order to achieve the above object, in the present invention, through a rigid guide tube whose tip protrudes 500 mm or more into the furnace,
Insert the tip of the flexible probe horizontally into the raw material layer near the top of the planned measurement position at a position of 500 mm or more from the furnace wall using a pusher, avoiding uneven loading on the furnace wall. , the probe tip with the pusher retracted is left behind in the raw material layer, and a flexible tube following the probe tip is lowered through the rigid guide tube in response to the lowering of the probe tip.

The present invention will be explained in detail below.

First, an apparatus for carrying out the present invention will be explained.

As shown in Fig. 1a, the vertical probe used in the present invention has a part (hereinafter referred to as the probe) 1 that is consumed during each measurement and a part (hereinafter referred to as the pusher) 2 that inserts the probe 1 into the inside of the furnace FS. , a conduit that guides a part of the probe 1 and pusher 2 into the furnace, and a guide device 3 that is an accessory thereof.

Furthermore, the probe 1 is used to protect the tip of the probe 1 when the probe 1 is pushed into the furnace.
A probe tip portion 11 for receiving stress from the pusher 2 (a gas suction hole 13 for gas suction is provided in the probe tip portion) is described in Japanese Patent Laid-Open No. 59-050324. A flexible tube 12 equipped with a thermocouple 14 etc.
It is composed of

FIG. 1b shows an enlarged cross-section of the head of the probe tip 11, and FIG. 1c shows an enlarged cross-section of the tail of the probe tip 11. This figure 1c is 2 in figure 1a.
It is an enlarged cross-sectional view of a portion surrounded by a dotted chain line circle 1C.

The pusher 2 is a pusher pipe 2 that transmits force for sending the probe tip 11 into the furnace.
1, a pushing force generating device 22 made of a hydraulic cylinder or a rotating roller, and a seal 23 for sealing the flexible tube 12 of the probe 1. The seal 23 is, for example,
As described in Japanese Patent No. 59-050337, it is preferable to use a structure that has sufficient sealing performance and does not receive much horizontal stress.

The guide device 3 protrudes into the furnace by a length that avoids uneven unloading on the furnace wall, in most cases about 500 mm, and guides the hollow probe tip 11 and pusher pipe 21 into the furnace. Embedded conduit 31, primary shutoff valve 32, cutter 33, secondary shutoff valve 34, pusher pipe 21, and conduit 31
It is composed of a sealing device 36 that seals the parts.

If the embedded conduit 31 protrudes a little into the furnace like in this device, it can be installed semi-permanently in the furnace with simple cooling, or it can be installed semi-permanently in the furnace like in the known shaft horizontal sonde. It may be possible to use it by thrusting it into the furnace only at certain times.

As shown in FIG. 1a, the probe tip 11 of the conduit 31 descends with relative displacement, so it is desirable to give the tip a suitable roundness so as not to receive sudden bending stress.

The flexible tube 1 is a primary shutoff valve 32 for shutting off ventilation between the blast furnace and outside air during non-measurement.
2, and a pipe cutter 33 for cutting the pusher pipe 21 and the flexible tube 12 of the probe 1 in the event that the pusher pipe cannot move forward or backward due to some trouble during pushing, and a secondary shutoff that cuts off the blast furnace and the outside air in that case. valve 34
has been established. This secondary shutoff valve 34 is not necessary if you are prepared for a small amount of gas leaking from the blast furnace.

For safety, it is preferable to provide a nitrogen supply valve with a pressure higher than the furnace internal pressure between the primary shutoff valve 32 and the secondary shutoff valve 34. That is, it is a device for sealing the pusher pipe 21 and the outside of the furnace, such as the seal described in Japanese Patent Application Laid-Open No. 59-050337.

The above is an outline of the configuration of the vertical sonde used in the present invention.

Next, the procedure of the present invention for measuring the temperature inside the blast furnace, gas sampling, pressure inside the furnace, etc. using these will be explained.

First, the flexible tube 12 of the measurement probe 1 is passed through the pusher seal 23 and the pusher pipe 21, and then the probe tip 11 is fixed to the probe tip (the tip of the flexible tube 12) (the fixing method is not shown). Next, the probe 1 and pusher pipe 21 are inserted into the probe seal 36 from the probe tip 11. in this case,
A valve for supplying nitrogen at a pressure slightly higher than the furnace internal pressure is opened to the cutter 33, and the sealing properties of the probe and the guide device 3, as well as the probe tip 11 and the pusher pipe 21 are tested. Once the seal is confirmed, the guide pipe 21 is pushed in until the probe tip 11 reaches the tip of the conduit 31. Reaching the tip can be easily confirmed since the tip 11 corresponds to the charging device.

Therefore, the required charging depth in the horizontal direction is determined, the pusher fixing part is moved back by that length, the pusher drive part and the pusher pipe 21 are fixed there, and the probe is pushed into the furnace and stopped at the predetermined length. Then, immediately move the pusher and pusher pipe 21 back about 300 mm from the initial setting position, taking into consideration the roundness of the tip of the guide, and then move the probe 1 (probe tip 11 and flexible tube 1
2) will be left behind.

In this case, it is necessary to take measures to prevent the probe tip 11 from retreating together with the pusher pipe 21.

The probe left behind immediately begins to descend along with the raw material. In this case, since there is a slack length of the probe (flexible tube 12) in the probe guide (conduit 31, etc.), retraction of the probe is confirmed after several seconds.

At the same time as leaving the probe behind, or after a certain period of time has passed, measurements such as temperature, gas sampling, pressure measurement, etc. are started, and when the probe is at the designated position (in most cases, when the temperature reaches about 1100°C), the pusher pipe 21 is Retract the inside of the furnace to near the secondary shutoff valve 34, and insert the probe into the cutter 3.
3, cut into the furnace, primary shutoff valve 32,
and close the nitrogen supply valve, move the pusher pipe 21 back to the sonde seal 36, and close the secondary shutoff valve 3.
4 is closed and the measurement is completed.

In addition, when the probe reaches the predetermined position,
Another method is to close the probe pipe (flexible tube) for gas sampling, cut it off from the rear, cover it with a cap before passing through the pusher pipe 21, complete the measurement, and then pull out the pusher pipe 21.

〔Example〕

A furnace with a gas sampling hole and a thermocouple at the tip of one probe, and a probe with thermocouples at 500mm and 1000mm behind the tip on the furnace wall 3600mm below the stock line of the blast furnace. Conduit 3 with its tip protruding 600mm inward
After setting the pusher charging length to 2000 mm from the tip of the first part and inserting it into the furnace, the pusher pipe 21 is retreated into the conduit 31 part, leaving the probe in the furnace, and the temperature is lowered as the raw material is unloaded. The results of measuring gas composition and pressure are shown in FIGS. 2 to 4.

Figure 2 shows the temperature measurement results inside the furnace, where A indicates the temperature at a position 2600 mm from the furnace wall, and B and C indicate the temperature at positions 2100 mm and 1600 mm, respectively.

FIG. 3 is a graph showing the measurement results of CO% and CO ₂ %, and FIG. 4 is a graph showing the measurement results of the furnace pressure.

In Figures 2 and 3, let temperature be y ₁ and gas analysis value be y ₂ , and if we look at the relationship between the vertical drop distance (x) from the stock line, yi = aix ⁴ + bix ³ + cix ² + dix + ei. It is a curve of fourth order or higher. Therefore, it is necessary to determine values at at least five measurement points along the vertical line of descent of the same probe. In this case, it is better to obtain measurement values at measurement points where there are particularly large changes, so a more accurate estimate can be obtained, so in the case of a blast furnace, the zone is 3,000m to 8,000m below the stock line and 11,000m below the stock line. If you have continuous values at two points in the ~16,000m zone, you can use the data between them to determine the value that fits the curve, especially the fourth order or higher, and you can very accurately determine the temperature and gas composition without having to measure the entire area inside the furnace. It becomes possible to estimate

In the present invention, as mentioned above, it was discovered that the longer the distance the probe descends in the reactor, the more difficult it is to accurately grasp the probe position.
By predetermining the measurement location in the furnace and inserting the probe near the top of the measurement zone, the position of the probe can be accurately estimated and more accurate data can be obtained.

In this case, the probe is preferably inserted within 1000 mm above the top of the planned measurement zone, most preferably within 400 mm above.

Furthermore, in the method of the present invention, the probe is inserted into the furnace using a rigid guide tube, so it can be inserted at any position in the radial direction of the furnace. By inserting it several times, it is possible to measure the temperature, gas composition, pressure, etc. at any location within the furnace. On the other hand, in order to improve measurement efficiency, it is desirable to provide a plurality of probe insertion devices in the direction of the furnace height, insert a plurality of probes, and measure simultaneously.

〔Effect of the invention〕

The present invention provides the following effects.

Since the probe is inserted near and above the measurement location, the position of the probe can be accurately estimated and highly accurate measurement results can be obtained.

Since the probe is inserted through a rigid guide tube provided through the furnace wall, there is no need for a large-scale charging device.

By inserting multiple probes through a single charging port, measurements can be made at any location within the furnace.

[Brief explanation of drawings]

FIG. 1a is a side view showing the state in which the probe is left in the blast furnace according to the present invention and a device for inserting the probe, and FIG. 1b is a side view showing the probe tip 1.
FIG. 1c is an enlarged sectional view of the area surrounded by the two-dot chain circle IC shown in FIG. 1a. FIG. 2 is a graph showing the temperature measurement results in the furnace measured by the present invention, FIG. 3 is a graph showing the measurement results of the collected gas composition measured by the present invention,
FIG. 4 is a graph showing the results of pressure measurement according to the present invention. Figure 5 shows the results when a probe is inserted into the blast furnace and left behind using the conventional method.
FIG. 3 is a cross-sectional view showing the state of descent of the probe. 1: Probe, 2: Pusher, 3: Guide device, 11: Probe tip, 12: Flexible tube, 13: Gas suction hole, 14: Thermocouple, 2
1: Pusher pipe (rigid guide pipe), 22: Pushing force generator, 23: Seal, 31: Embedded conduit, 32: Primary shutoff valve, 33: Cutter, 34:
Secondary shutoff valve, 36: sealing device.

Claims (1)

[Claims] 1. A flexible probe equipped with at least one of a temperature measuring element, a gas sampling hole, and a pressure sensor is placed in the vertically packed reaction bed, and is lowered as the raw material is unloaded to monitor the inside of the furnace. In the method of detecting the condition inside the packed reaction bed, which measures the
Push the tip of the flexible probe into the raw material layer near the top of the planned measurement position through a rigid guide tube that protrudes more than 500 mm, at a position more than 500 mm from the furnace wall to avoid unbalanced loading on the furnace wall. After horizontally inserting the probe into the material layer, the pusher is retracted to leave the probe tip in the raw material layer, and a flexible tube following the probe tip is inserted through the rigid guide tube in response to the descent of the probe tip. A method for detecting conditions in a vertically packed reaction bed using a left-behind type sonde, which is characterized by performing measurements while being lowered.