JPH02229540A - Control device for disk pelletizer - Google Patents

Abstract

PURPOSE:To easily carry out the adjusting operation by providing an ultrasonic level meter, an inclining driving unit of disk pelletizer and a computing element. CONSTITUTION:Raw material is mixed in a drum mixer 5 while water is added, and supplied to the disk pelletizer 6. Raw pellets are obtained with the disk pelletizer 6 while water is added. The raw pellets are supplied to a secondary drum mixer 7 while powdery solid fuel is sent from a storage vessel 8 to coat the surface of pellet, which are supplied to a sintering unit 11 through a reciprocating belt conveyer 9 and a charging belt conveyer 10. The adjustment of the inclination angle and the number of revolution of the disk pelletizer 6 is carried out by the angle of repose obtained from the calculation by the computing element and the measurement through the ultrasonic level meter 21. By this method, the quality of lumped ore is stabilized.

Description

Detailed Description of the Invention [Field of Industrial Application] This invention relates to a disk pelletizer control device that changes the disk pelletizer inclination angle and rotation speed in response to changes in raw material conditions. [Conventional technology] Disc beretizers are widely used for granulating powdered iron ore. In a disk pelletizer, when the raw material conditions (brand, moisture, binder addition rate, etc.) or raw material supply amount change, the inclination angle and rotation speed are adjusted to keep the particle size (or particle size range) of the green pellets constant. ．． and,
The operator makes this adjustment while observing the particle size of the raw pellets being manufactured. [Problem to be solved by the invention] The conventional adjustment method, in which the operator performs the adjustment while observing the grain size of the raw pellets being manufactured, relies on the operator's experience and intuition, which tends to result in overaction. ll
II! The problem is that the operation has to be repeated several times and it takes a long time. [Means for Solving the Problems] The present invention aims to solve the above-mentioned problems, and includes at least two ultrasonic level meters disposed at a distance above the raw material retention surface of a disk pelletizer, and the ultrasonic level meters. Based on the measurement signal of the sonic level meter, the disk pelletizer inclination angle signal from the disk pelletizer tilting device, and the rotation speed signal from the disk pelletizer rotational drive device, the disk pelletizer inclination angle is set to a predetermined value;
This is a disk pelletizer control device consisting of an operator which determines the optimum rotational speed at the disk pelletizer inclination angle and transmits the data to the disk pelletizer tilting device and rotary drive device. [Operation] The computing unit calculates the angle of repose of the raw material from the measurement value of the ultrasonic level meter, calculates the angle of inclination of the disc pelletizer to achieve the target holding amount, and the optimum rotation speed for that angle of inclination, and adjusts the angle of inclination and rotation of the disc pelletizer. The number is commanded to the tilting device and rotary drive device of the disk pelletizer. Therefore,
Automatically adjusts in a short time when there are changes in raw material conditions or raw material supply amount! 1 operation is performed. [Example] An example of the present invention will be described below using a disk pelletizer for producing agglomerated ore as an example. Figure 3 shows the process from producing green pellets to charging them into the sintering machine. 1
2 is a storage tank for pellet feed with a grain size of -44μ of 40 to 50% or more, 2 is a storage tank for powdered iron ore with a grain size of -8μ, 3 is a storage tank for return ore generated during the crushing of agglomerate ore, and the sizing process. 4 is a storage tank for quicklime as a binder. The raw materials cut out from each tank are mixed in a drum mixer 5 while adding water, and then supplied to a disc beletizer 6. In the disk beretizer 6, green pellets with a grain size of 5 to 10 grains are produced while adding water. The raw pellets are fed to a secondary drum mixer 7. In the secondary drum mixer 7, the surface of the green pellets is coated with the powdered solid fuel cut out from the powdered solid fuel storage tank 8. The raw pellets coated with powdered solid fuel are supplied to sintering 1fill via a reciprocating belt conveyor 9 and a charging belt conveyor 10. If the quality of the agglomerate (tumbler strength, finished product particle size, etc.) deteriorates, a binder (quicklime) is added to restore the quality.
The addition rate and amount of added water are changed. When these changes are made, the angle of repose of the raw material changes, so the inclination angle and rotation speed of the disc beletizer 6 are adjusted. Fig. 1 is a block diagram of the disc pelletizer control device of the present invention, and Fig. 2 is a diagram showing a disc pelletizer equipped with an ultrasonic level meter. 21 is an ultrasonic level provided at a predetermined interval above the raw material retention surface. It is used to measure the height h from the raw material retention surface to the level meter, which is the basis for determining the angle of repose of the raw material. In Figure 2, two are provided. Note that if three or more are provided, the angle of repose of the raw material can be determined more accurately. 22 is a computing unit that (1) calculates the angle of repose α of the raw material from the measured values h, , h2 of the ultrasonic level meter 21 and the interval ρ between the ultrasonic level meters 21 and 21, and calculates the angle of repose α of the disc pelletizer θ (θ = α + β: β here
is the holding angle). ■ Once the inclination angle θ of the disc pelletizer is determined, the optimal rotation speed n of the 5-disc pelletizer can be determined from the following formula,
n = N c Also, ν is the specific rotation speed, v = n / N
o, and 0.4 to 0.75 is considered an appropriate value.
That is, 0.4XN. All you have to do is adjust n so that <n<0.75N. The obtained inclination angle θ of the disk pelletizer and the optimum rotation speed n of the disk pelletizer are sent to the disk pelletizer-6. 61 is a tilting device that changes the inclination angle of the disk pelletizer, and 62 is a rotation drive device that changes the rotation speed of the disk pelletizer. Then, the tilting device 61 receives the tilt angle θ that makes the holding angle β of the disk beletizer 6 constant (the holding amount is constant) from the calculator 22, and changes it to the angle. Rotary drive device 6
2 receives the optimum rotation speed (when the inclination angle θ) of the disc beletizer 6 from the operation 822 and changes it to the rotation speed. Therefore, the particle size (or particle size range) of the raw pellet
and strength is maintained. [Effects of the Invention] When the raw material conditions change, the present invention automatically adjusts the inclination angle and rotation speed of the disc pelletizer using a plurality of ultrasonic level meters and a calculator provided above the raw material retention surface of the disc pelletizer. , since it changes to the optimal value,
The effect is that the changes can be made quickly and accurately, and the quality of the agglomerate ore will not deteriorate. be. 6...Disc pelletizer

Claims (1)

[Claims] At least two ultrasonic level meters provided at a distance above the raw material retention surface of the disk pelletizer, measurement signals from the ultrasonic level meters, a disk pelletizer tilt angle signal from a disk pelletizer tilting device, and a pelletizer rotation drive device. Based on the rotation speed signal from
A disk pelletizer control device comprising a calculation unit that determines a disk pelletizer inclination angle that is a set holding amount and an optimum rotation speed at the disk pelletizer inclination angle and sends the information to a disk pelletizer tilting device and rotation drive device.