JPS6039125B2 - Probe for observation and measurement inside blast furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring and observing a real image inside a blast furnace.

In recent years, blast furnaces have become extremely large with an internal volume of 4,000 to 5,000, and the pressure at the top of the furnace has also increased to 2 kg/G to 3 kg/G.

On the other hand, increases and decreases in production due to fluctuations in the raw material and fuel situation and economic conditions, rapid changes in various conditions surrounding blast furnace operation, and furthermore, the consumption of blast furnaces accounts for an extremely large proportion of the total energy consumption in the steelmaking process. Due to the strong demand for energy conservation, the high efficiency and
There is a strong demand for high degree of freedom and stable operation. For this purpose, we must take into consideration the temperature of the gas in the furnace during operation, the gas composition, the gas flow rate, and the gas flow state, as well as the temperature of the raw material in the furnace, the reduction situation, the filling structure of the raw material, the rate of descent, and its distribution state. Accurate measurement is extremely important, and as part of this effort, horizontal sonde devices, vertical sonde devices, profile meters, and various other devices for detecting conditions inside the reactor and models for estimating conditions inside the reactor are being developed and applied to the field. The measurement results are immediately fed back to the operational side to change various conditions such as the conditions for controlling the burden distribution at the top of the furnace, the raw material charging conditions, or the conditions related to air blowing from the vane. Attempts have been made to control blast furnaces and achieve highly efficient and stable operation of blast furnaces. However, the physical quantities (measurement items) of the furnace state that can be measured by the various furnace internal determination devices that have been developed so far are only a part of the items necessary for controlling the present blast furnace.

In other words, as is well known, in the case of a counter-flow type reduction packed tower consisting of reducing gas, solids to be reduced (iron ore, competitive ore, etc.) and coke, such as in a blast furnace, the distribution of reducing gas within the furnace is Control is extremely important for improving the reduction efficiency and heat exchange efficiency of the furnace. Nevertheless, the main factors that determine these are the particle size imbalance of the raw material in the furnace, the layer thickness ratio of ore and coke, and the formation of a mixed layer. There was no means to quantitatively elucidate the filling structure under actual conditions.

In addition, as a result of blast furnace dismantling research conducted one after another during this period of about 10 years, it was found that raw materials that had undergone reduction and heat exchange (
The existence of a softened cohesive zone, where the ore layer (ore layer) softens and fuses inside the furnace, causing localized large ventilation resistance, has been revealed.Based on several findings, it has been found that this zone is closely connected to the operating conditions of the blast furnace. It is already known that various attempts have been made to measure and control the softened kudzu worm zone as one of the aims of controlling blast furnace operations. However, there has been no means to visually measure and confirm the softened cohesive zone during operation, and therefore there has been no consideration of blast furnace control based on the results. Furthermore, although conventional horizontal and vertical sonde devices are used to measure the gas temperature and gas composition at a certain position in the furnace, the present inventors have found that the gas temperature and gas composition are Depending on whether the raw material layer near the point where the composition is measured is a coke layer, an ore layer, or a mixed layer, the porosity determined by the average particle size of the raw material and the gas flow rate affected by the porosity. However, the measured values of the gas temperature and gas composition themselves were affected, and there was a problem in terms of the representativeness of the in-furnace constant values.

In other words, when measuring the in-furnace gas temperature or gas composition at a specific measurement point in a blast furnace that is in a steady or quasi-steady state, the measurement point is either in the coke layer or in the ore layer. depending on whether it is in the mixed layer or in the mixed layer.
In addition, the measured values are determined by the particle size of the raw material in the vicinity, the packing structure, etc., and the measured values also vary depending on the flow rate of the gas flowing there. It is necessary to clarify under what conditions the furnace gas temperature and gas composition were measured. However, this was not possible with conventional measuring devices. In addition, mechanical, microwave, and
Profile meters such as laser types are well known, and attempts have been made to measure the descending velocity distribution and layer thickness of raw materials. (Especially coke) may flow into the center of the furnace, and therefore the profile of the previous batch before charging the raw materials for a certain batch may not necessarily maintain the same shape after charging the raw materials for that batch. Despite the large size, the reliability of the control was not necessarily sufficient because the profile was assumed to remain unchanged before and after the raw material was charged into the batch.

In addition, these profiles are also affected by the opposing gas flows in the furnace at the upper part of the furnace, and are rearranged as the raw material descends. In order to control the shape and structure, it is desirable to understand the filling structure in the furnace region below the middle stage of the shaft, where the rearrangement phenomenon is thought to be sufficiently suppressed. However, it didn't exist.
As mentioned above, various conventional blast furnace in-furnace determination devices are capable of measuring the main factors that determine the distribution of reducing gas in the furnace, such as the raw material particle size segregation in the radial direction of the furnace, the packing structure, and the distribution of the raw material descent rate in the direction of the furnace fleas. There are drawbacks such as the inability to measure the softening and fusion of raw materials, and the inability to confirm the position, shape, and structure of the cohesive zone inside the reactor during operation and during wind breaks. Ta.

The present invention was made in order to eliminate the drawbacks of the conventional products as described above, and the present invention was made in Japanese Patent Application No. 56-5990.
The proposed method involves inserting one or more lances having at least a real image transmission function into the blast furnace and transmitting the obtained real image information from various angles (methods).

Suitable for a blast furnace internal determination device consisting of a device that analyzes the results using an analysis device) and outputs the results as a display and/or electric signal, or outputs the deviation from the desired value (state) of those signals (state). The purpose is to provide probes. The present invention will be explained below with reference to figures showing one embodiment.

Fig. 1 shows an overview of the observation of a real image inside a blast furnace using the apparatus of the present invention, in which 1 is a cross-sectional half-body of the blast furnace, 2 is a cohesive zone formed in the furnace, and 3 is the upper end of the contents in the furnace. , 4 is a probe of the present invention, 5 is a linear body incorporating an image guide fiber, a light guide fiber, and each twill and objective lens system at both ends thereof, 6 is an external light source device, 7 is a high-sensitivity color camera, 8 9 is a color video device, 9 is a color monitor, and 10 and 11 are signal transmission cables connecting each.

FIG. 2 is a sectional view of the main part of the probe 4 of the present invention, and 12 is a cylindrical body with a linear body 5 inside, and the outer periphery of the linear body 5 and the cylindrical body 12 are
A gap 13 is formed between the inner periphery of the gap 13 and an externally installed gas source (not shown) is passed through the gap 13.

Reference numeral 14 denotes an intermediate partition, and a gap 15 is formed between it and the outer periphery of the cylindrical body 12.
An outer wall cylindrical body 17 is provided through the intermediate partition 14 and a gap 16, and the gaps 15 and 16 are communicated with an external refrigerant source (not shown).

The intermediate partition 14 has a cutout 19 on the furnace insertion end 18 side of the probe 4 to allow cold soot (not shown) to flow as shown by an arrow 20. 21 is the furnace insertion end 1 of the probe 4
The end portion of the linear body 5 is supported by a metal fitting formed on the side 8, and the gas (not shown) is connected to the end portion 2 of the linear body 5 inserted into the furnace.
2 has a passage 23 that serves as a refrigerant and prevents contamination by injecting it onto the surface.
Further, a member 25 for closing the furnace insertion end 24 of the cylindrical body 12 is a plug detachably provided at the furnace insertion end 18 of the probe 4.

The probe 4 of the present invention was designed by the inventors of Tokukasho 54-165690 and HakamagaoSho 54-1656, taking into account the operation and the adverse effects on the inside of the furnace due to probe insertion.
It is desirable to use a small lance (probe) as proposed in 91 and Tokukoshi Sho 54-165692,
For the outer wall cylindrical body 17, it is preferable to use a SUS31 eave in consideration of heat resistance and the like.

Further, it is preferable to use copper for the cylindrical body 12 and the intermediate partition body 14 in order to improve the cooling effect of the cold butterfly and its heat transfer.
As proposed in No. 91, it is preferable to insert the probe 4 slightly deeper than the predetermined layer in the furnace and then retreat it to bring it into a general state where it can be dislodged in the furnace. probe 4
Insertion and removal into and out of the furnace can be carried out using a normal blast furnace sonde device;
It is more preferable to use the blast furnace sonde device proposed in No. 0. According to the probe of the present invention described above, a real image inside the blast furnace can be observed in detail, and the optical information guided from inside the blast furnace by the image guide fiber is time-shared with the image observation, so that the fiber-type radiation temperature can be measured for just a few seconds. By inputting the information into the meter, it is possible to instantly measure the average temperature within the image.

In this way, it is possible to directly grasp the location, thickness, and properties of the kudzu-covering zone, as well as changes in the properties of the charge, and at the same time, it is also possible to measure the temperature. The effect on the stability of furnace conditions is significant.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating an overview of an embodiment of the present invention, and FIG. 2 is a sectional view of the lozenge portion of the probe of the present invention. 1... Blast furnace cross-sectional half-furnace body, 2... Cohesive zone in the furnace, 3... Upper end of the furnace contents, 4... Probe of the present invention, 5...・An image guide, a light guide, a bush eye, and a bran containing an objective lens system, 6...
External light source device, 7... High sensitivity color camera, 8...
...Color video device, 9...Color monitor, 10, 11...Signal transmission cable, 12...
Cylindrical body, 13...Gap, 14...Intermediate partition, 15...Gap, 16...Gap, 17...Outer wall Cylindrical body, '8... End of probe inserted into the furnace, i9... Missing part, 20...
...Arrow, 21...Metal fittings, 22...
・Furnace insertion end of linear body, 23...Passway, 24
... End of insertion of cylindrical body into furnace, 25 ... Entire part. Diagram of the foot of the second box

Claims (1)

[Claims] 1. A linear object containing an image guide fiber and a light guide fiber is housed in a cylindrical body with a gap between the outer periphery of the cylindrical object and an external refrigerant source on the outer periphery of the cylindrical object. A probe for observing and measuring the inside of a blast furnace, which includes an outer wall cylindrical body formed through a refrigerant passage communicating with the outer wall cylindrical body, and a plug body removably attached to the furnace insertion end of the outer wall cylindrical body. 2. The probe for observing and measuring the inside of a blast furnace according to claim 1, wherein an externally installed gas is communicated through a gap between the outer periphery of the linear object and the inner periphery of the cylindrical body.