JPH0689414B2 - Sintering end point position control method in agglomerated ore manufacturing - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sintering end point position control method in agglomerated ore production, in which burst noise of raw pellets is measured and pallet speed is controlled.

[Prior Art] An agglomerated ore is generally manufactured as follows. Powdered iron ore, solvent mixture such as serpentine and crushing of agglomerated ore, compounded return ore of 4 mm or less generated in the sizing process, mixed with a mixer, granulated with a primary pelletizer, then with a secondary pelletizer, Secondary granulation is performed by coating the surface of this granulated material with solid fuel such as powder coke, char, pulverized coal, etc., to produce 5-10 mm raw pellets, and these raw pellets are put into an endless moving great type sintering machine. Charge and fire. The fired product is crushed to a predetermined size, cooled, and sized to produce an agglomerated ore of 4 mm or more.

In the above manufacturing process, when the raw pellets are charged into a sintering machine and fired, a sintering end point position control method which is generally used is generally used. That is, as shown in FIG. 3, each air box 2 provided below the pallet 1 is provided with a thermometer 3 such as a thermocouple, and the temperature of the exhaust gas passing through the air box 2 is measured by the thermometer 3. Obtain the wind box with the highest gas temperature from the temperature distribution of, and set it as the sintering end point,
The speed of the pallet is controlled so that the sintering end point becomes the optimum position.

As another method of controlling the position of the end point of sintering for ordinary sintering,
JP-A-61-147820 discloses a method in which the temperature distribution in the red tropical zone at the bottom of the charging raw material is directly measured by an optical fiber thermometer in the wind box to determine the sintering end point.

[Problems to be Solved by the Invention] A conventional sintering end point position control method is 25 to 25 after ignition in a charging layer.
Only after 30 minutes can the end of sintering be detected. Therefore, during this period, even if there is a change in the factors that cause fluctuations in the sintering rate such as air permeability, the action of the pallet speed of the sintering machine is not performed. There is a problem.

[Means for Solving the Problems] The present invention is intended to solve the above problems,
A plurality of noise sensors are installed at intervals above the charging layer after the ignition furnace and in the machine length direction, the noise level is measured, the sintering end point is determined based on the noise level value, and the sintering end point is optimal. A method for controlling the position of a sinter end point in agglomerated ore production, which comprises controlling the pallet speed so that the pallet is positioned.

[Operation] From the noise level value due to the burst noise of the raw pellets in the combustion zone of the charging layer that passes under the noise sensors installed near the ignition furnace, the attenuation level linear expression of the noise level is obtained, and the noise level at the end of sintering is determined. If the distance that becomes the value is obtained, that distance becomes the position of the sintering end point. By causing the computing unit to perform this computation, it is possible to detect the sintering end point about 15 to 20 minutes earlier than the conventional method. Therefore, the deterioration of the quality of the agglomerated ore or the loss of the production amount can be prevented during this period.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 2 is a block diagram for implementing the method of the present invention, and FIG. 2 is a graph for explaining the method of controlling the sintering end point position of the present invention.
In FIG. 1, the raw pellets charged in the pallet 1 of the sintering machine are dried in the drying furnace 5 using high temperature exhaust gas from the sintering machine, and then ignited on the surface of the raw pellet layer in the ignition furnace 6. On the other hand, in the drying furnace 5 and thereafter, gas or atmosphere is sucked downward by the main blower 17 (not shown) through the wind box 2 and the main duct 4 through the raw pellet layer charged in the pallet 1. Then, the combustion zone generated on the surface of the raw pellet layer progresses downward with the movement of the pallet, the entire height of the raw pellet layer is sintered before the sintering machine discharge section 10, and is continuously discharged from the discharge section 10. To be done. The discharged sintered body is sent to a crushing and sizing process. In this process,
Among the raw pellets in the combustion zone, the raw pellets containing iron ore that is easily cracked by heat cause bursting due to thermal cracking of the iron ore and vaporization of internal moisture, and at that time, make a burst noise.
Then, when the noise level of this plosive sound was measured on the raw pellet layer, it was found that the combustion zone was linearly attenuated as it proceeded downward in the raw pellet layer. The present invention is, in the above equipment, a plurality of noise sensors 7 (1, 2, 3, 4) at equal intervals above the charging layer after the ignition furnace in the machine direction.
For example, they are provided at intervals of 2m. The noise level signals measured by the plurality of noise sensors 7 are transmitted to the arithmetic and control unit 8.
The arithmetic and control unit 8 obtains the noise level attenuation linear equation from the transmitted noise level value, and the noise level value at the sintering end point = No
Find the intersection with the straight line. That is, in FIG.
If the obtained noise level attenuation linear equation is B, the distance coordinate D ₄ of the intersection with the straight line of the noise level value = No at the sintering end point is obtained. Then, D ₄ represents the distance from the rear end of the ignition furnace at the sintering end point at this time. Next, it is confirmed where D ₄ is located with respect to the set optimum range D _{1 to} D ₂ . In this case, since it is located on the mine ore side from the optimum range D _{1 to} D ₂ (sintering speed is slow), a signal for lowering the pallet speed by a predetermined amount is issued. When the calculated noise level attenuation linear equation is A,
The distance coordinate at the end of sintering is D ₅ . D ₅ is the optimum range D _{1 to} D ₂
Since it is located inside, the pallet speed increase / decrease signal is not output. When the calculated noise level attenuation linear equation is A, the distance coordinate of the sintering end point is D ₃ . D ₃ is so located in the ignition furnace side than the optimum range D ₁ to D ₂ (sintering speed is high), it provides a signal to increase the predetermined amount palette speed. For the amount of increase or decrease in pallet speed, the obtained sintering end point is in the optimum range D ₁ ~
Determine and determine the pallet speed within D ₂ . Arithmetic controller 8
Transmits the increase / decrease amount of the pallet speed thus obtained to the drive motor 9 of the sintering machine. The drive motor 9 increases or decreases the pallet speed according to the received signal. Therefore, the sintering end point is always controlled to be in the optimum range.

The noise sensor may be provided within a range of 5 to 10 m from the rear end of the ignition furnace. By setting this range, it is possible to detect the sintering end point about 15 to 20 minutes earlier than the conventional method.

EFFECTS OF THE INVENTION The present invention controls the pallet speed by obtaining the sintering end point by a plurality of noise sensors provided behind the ignition furnace, and therefore controls the pallet speed about 15 to 20 minutes faster than the conventional method. can do. Therefore, it is possible to obtain the effect of eliminating the deterioration of the quality of the agglomerated ore or the loss of the production amount which has been conventionally generated during this period.

[Brief description of drawings]

FIG. 1 is a block diagram for carrying out the method of the present invention, and FIG. 2 is a graph diagram for explaining the sintering end point position control method of the present invention.
FIG. 3 is a diagram for explaining a conventional method for controlling the position of the sintering end point. 1 ... Pallet, 5 ... Drying furnace, 6 ... Ignition furnace, 7 ... Noise sensor, 8 ... Arithmetic controller, 9 ... Drive motor, 10 ... Exhaust section.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hideaki Inoue 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Yuko Yura Examiner, Nihon Kokan Co., Ltd.

Claims (1)

[Claims] 1. A charging layer above the ignition furnace and in the machine length direction,
A characteristic is that a plurality of noise sensors are provided at intervals to measure the noise level, the sintering end point is obtained based on the noise level value, and the pallet speed is controlled so that the sintering end point becomes the optimum position. Sintering end point position control method for agglomerated ore production.