JPH01208692A - Material grain size detecting device for vertical furnace - Google Patents

Abstract

PURPOSE:To permit the proper and correct regulation of the supply of material, by a method wherein a vibrating body is provided in the flow passage of granular particles to indicate the number of vibration of the vibrating body by detecting the vibration thereof and grasp the change with time of the grain size of the material from the change of the number of vibrations. CONSTITUTION:A vibrating body 11 is received in a protecting member 19 when material A is loaded into a lower hopper 5. When the flow-down of granular particles (a) is started and the vibrating body 11 is descended, the vibrating body 11 is vibrated by the particles (a), colliding against a protuberance 21, and a pick-up 12 indicates the condition of the vibration of the vibrating body 11 on a display means 13. When the flow speed of the particles in a discharging end 16 is constant, there is a positive correlative relation among the vibrating number (nu) of the vibrating body 11, the number N of particles colliding against the vibrating body 11 and the number No of particles per unit volume, therefore, the grain size distribution of the supplying material A may be decided when the number (nu) of vibration is determined timewise by a vibration waveform (Lissajoius's figure) or the like indicated on the display means.

Description

[Detailed Description of the Invention] This Industrial Application Field] The present invention relates to a raw material particle size detection device for a vertical furnace, and in particular to a raw material particle size detection device for accurately grasping the particle size of a raw material charged into a vertical furnace. This invention relates to a particle size detection device.

This conventional technology 1 Generally, raw materials containing a mixture of fine particles and small particles are
When charging particles into the main body of a vertical furnace such as a blast furnace, a device is required to make adjustments such as making the particle size constant over time.

As shown in FIG. 5, conventionally, this type of vertical furnace has an upper hopper 3 for receiving the raw material A conveyed by the belt conveyor 1 and feeding it into the furnace body 2 while adjusting the amount. and lower hopper 5 with gate 4? −)
In addition, a rotating chute 7 that rotates around the reactor core 6 is interposed between the belt conveyor 1 and the upper pumper 3. This rotating chute 7 prevents the particle size from changing over time by properly mixing the particles a that have been classified while being conveyed by the bell 1-conveyor 1 before dropping them into the upper hopper 3. There are also efforts to stabilize furnace operation.

Problems to be Solved by the Invention] By the way, conventional vertical furnaces did not have a device for detecting the grain size of raw materials.

Therefore, in controlling the rotating speed of the rotating chute 7, the change in particle size distribution is estimated based on the temperature distribution in the furnace using the furnace thermometer 8, and it is determined whether or not the operation is appropriate.

However, this indirect data is susceptible to fluctuations due to factors in the pond, such as the state of raw material accumulation in the furnace, and is not necessarily useful for understanding the particle size of the raw material.

Therefore, the present invention was devised to provide a new device that can grasp the particle size distribution of the raw material to be charged, and to appropriately adjust the particle size.

[Means for Solving the Problems] The present invention provides a vibrating body that is provided along a flow path for particles to be charged into a furnace main body and has a protrusion protruding into the flow path; Vibration sensing means for sensing vibrations of the vibrating body generated when particles on the way collide with the protrusion and measuring the vibration frequency; and Vibration sensing means for sequentially displaying the frequencies measured by the vibration sensing means. It is equipped with a display means.

[Operation] With the above configuration, the vibrating body is vibrated by the flow of the raw material made of particles. The vibration sensing means senses this vibration and displays the vibration frequency on the display means.

Since this frequency depends on the number of particles colliding with the vibrating body, that is, the size of the particles, the particle size of the charged raw material can be determined.

:Example] Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a raw material particle size detection device for a vertical furnace according to the present invention. This device has a lower hopper 5
A vibrating body 11 is provided along the discharge direction of the lower hopper 5 which becomes the reactor core 6, a pickup 12 which is a vibration sensing means attached to the vibrating body 11, and a signal from the pickup 12 is converted as appropriate. It also mainly comprises a display means 13 for sequentially displaying desired information. That is, the pink-up 12 and the display means 1
3 form a known vibration meter.

The vibrating chamber 11 is suspended by a support rod 15 from a lifting device 14 provided above the lower hopper, and is configured to reciprocate between the raw material discharge end 16 of the lower hopper 5 and its upper portion 17. The support rod 15 is surrounded by a protective tube 1.
8 and one protection member located at the upper part 17, and is shielded from the raw material A put into the lower horapara. Further, the support rod 15 is fixed to the protective tube 18 at two locations, upper and lower, to prevent secondary vibration when the vibrating body 11 vibrates.

The pink-up 12 is screwed to the upper end of the vibrating body 11 that is not collided with the particles a, and is connected to the display means 13 by a cord 20 provided along the support rod 15.

As shown in FIG. 2, a protrusion 21 is formed on the vibrating body 11. As shown in FIG. In this example, it has a sawtooth shape that protrudes outward in the radial direction, and the flowing particles a collide with each other while falling into the furnace, and the particles that come into contact are fixed and the natural frequency is reduced. It is formed so that it does not change.

Next, the operation of this embodiment will be explained.

When charging raw material A into the lower hopper 5, the lifting device 14
The vibrating body 11 is raised to the raised position and housed inside one of the protection members.

Raw material A is stored in the horapara, gate 4 is activated,
When the particles a start flowing down, the vibrating body 1 is lifted up by the lifting device 14.
1 is lowered and placed in the flow of particles a. The vibrating body 11 vibrates due to particles a colliding with the protrusion 21,
The pickup 12 causes the display means 13 to display this vibration state. By understanding the vibration frequency from the displayed vibration state, the particle size of the raw material particles can be detected as follows.

If the flow velocity at the discharge end 16 of the lower horapara is constant,
There is a positive correlation between the frequency ν of the vibrating body 11, the number N of particles colliding with it, and the number N0 of particles per focal volume.

The number N of particles per nest volume. is influenced by the particle size when the density of particles a is the same. That is, if there are many particles with a small particle size, the number N. will increase. From these relationships, for example, the larger the frequency ν, the fewer particles with larger particle diameters are established (see FIG. 3).

b, the vibration waveform (Lissajou figure) displayed on the screen in the display means 13! 4, if the frequency ν is determined over time, the particle size distribution of the raw material A to be supplied can be determined. For example, if a change as shown in Fig. 4 is observed, the rotating chute 7, etc. should be adjusted in the direction of correcting the patterns (B) and (C) at the next injection to maintain the - constant state fi (D). You can take measures such as driving it.

In this way, since the particle size change of the raw material immediately before being supplied into the furnace is ascertained by the vibration meter, it becomes possible to carry out appropriate charging control in response to the change.

Furthermore, if you want to more accurately understand the particle size not only as a change over time but also as a particle size distribution, you can compare the particle size change pattern with the measured particle size and apply it to actual furnace operation.

Note that the shape of the protrusion is not limited to this example, and its dimensions, chevron pitch, etc. may be selected in consideration of the properties of the raw material, operating conditions, etc. Furthermore, the vibrating body, protection tube,
Since the protective member and the like are directly exposed to particles, it is desirable that the protection member be made of a wear-resistant material or covered with an outer skin formed of a wear-resistant material.

"Effects of the Invention" In summary, according to the present invention, the following excellent effects are achieved.

Since it is newly equipped with a vibrating body installed in the particle flow path, a vibration sensing means for sensing the vibration of the vibrating body, and a display means for displaying the frequency, it is possible to detect changes in particle size over time from changes in the frequency. By being able to understand and make appropriate adjustments, it is possible to contribute to more appropriate and stable operation of the furnace.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the raw material particle size detection device for a vertical furnace according to the present invention. Fig. 4 is a diagram showing the particle size change pattern, and Fig. 5 is a configuration diagram of a conventional vertical furnace. is a display means, and 21 is a protrusion.

Claims (1)

[Claims] 1. A vibrating body is provided along a flow path for particles to be charged into the furnace main body and has a protrusion protruding into the flow path, and the vibrating body has a protrusion that is protruded into the flow path, and the particles collide with the protrusion during charging. It is characterized by comprising a vibration sensing means for sensing the generated vibration of the vibrating body and measuring its frequency, and a display means for sequentially displaying the vibration frequency measured by the vibration sensing means. Raw material particle size detection device for vertical furnaces.