JPS5931563B2 - Material distribution control method in bellless furnace top charging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on Be! This invention relates to a raw material distribution control method in a reless furnace top charging device, and is capable of increasing the degree of freedom in raw material distribution and improving and facilitating the controllability of raw material distribution.

In recent years, a bellless furnace top charging device has been adopted as a blast furnace top charging device in order to improve the controllability of the raw material distribution in the furnace and to increase the degree of freedom in the raw material distribution.

As shown in FIG. 1, the bellless furnace top charging device is located directly above the stock level 2 inside the upper mantel 1 of the blast furnace body.
A distribution chute 3 is arranged so that a circular movement (swivel) around the furnace axis and a variable tilt angle movement (tilting) about the furnace axis can be performed independently or simultaneously by a drive device 4, and a hopper 6 is provided at the upper part of the blast furnace. The raw material 7 inside the hopper 6 can be discharged by changing the opening degree of the flow rate regulating gate 5 provided at the raw material discharge part at the bottom of the hopper 6 according to the motion sequence of the blast furnace, and also according to the motion command of the distribution chute 3 inputted in advance. The raw material is distributed in the furnace, and the distribution in the circumferential direction within the furnace can be performed by the rotating movement of the distribution chute 3, and the selection of the raw material position in the radial direction can be performed by the tilting movement of the distribution chute 3. be.

That is, the distribution chute 3 is rotated at a constant speed by an electric motor, and the flow rate adjustment gate 5
The raw material distribution is performed by a constant discharge amount by keeping the opening constant.

However, in the above method, (1) the flow rate adjustment gate is used at a constant opening, so the mixing ratio of raw materials, such as sintered ore, pellets, raw ore, miscellaneous raw materials, etc. in iron ore, etc. When the mixing ratio of the coke differs, or when the particle size distribution of the coke differs, the time it takes for the raw material to be discharged will differ even if the flow rate adjustment gate is opened at the same degree, and the amount of raw material fed into the hopper will vary depending on the conditions of the blast furnace. The material discharging time also changes even if the flow rate adjustment gate is opened to the same degree.As a result, the material distribution time in the distribution chute, which rotates at a constant speed, is not constant, and therefore the distribution rotation The number of raw materials varies, making it impossible to distribute the raw materials uniformly.

(11) Even if we try to distribute the raw materials in the hopper within a short time depending on the conditions of the blast furnace, since the rotation speed of the distribution chute is constant, the distribution of raw materials will become uneven, resulting in uneven distribution of raw materials depending on the furnace conditions. This does not necessarily mean that there are many degrees of freedom in terms of distribution, which is a constraint when doing things like legs.

It had the following drawbacks.

The present invention eliminates the drawbacks of the conventional method described above, improves controllability by removing restrictions on material distribution control, and improves the degree of freedom in material distribution in a bellless furnace top charging device for material distribution. This method is related to the control force method, in which the optimum opening degree of the flow rate adjustment gate and rotation speed of the distribution chute are calculated using a computer based on the raw material conditions, distribution pattern, and raw material outflow characteristics in the bellless furnace top charging device. Based on this calculation, a required pulse signal is generated from a pulse oscillator, and the pulse signal is sent to a digital actuator connected to the flow rate adjustment gate opening/closing mechanism and a stepping motor connected to the distribution chute rotation mechanism to control raw material distribution. It is characterized by the fact that

An embodiment of the present invention will be described with reference to FIG.

A digital actuator 9 is connected to the opening/closing mechanism 8 of the flow rate adjustment gate 5 which is openable and closable at the raw material discharge port of the hopper 6, and a pulse oscillator 10 is connected to the actuator 9 to generate pulse signals for activation, stop, etc. A stepping motor 12 is connected to a calculator 11 that calculates a pulse oscillator and a pulse oscillation frequency according to an opening degree and a turning command signal, and is connected to a turning mechanism 4A of one drive device 4 of the distribution chute 3. A pulse oscillator 13 that oscillates pulse signals such as activation and stop is connected to the computing unit 11, and a setting device 14 that sets raw material distribution commands and a data stock unit 15 that stores various data are connected to the computing unit 1.
1 respectively.

The stepping motor 12 outputs a rotation angle corresponding to the number of pulses at a speed proportional to the pulse oscillation frequency.

This is a so-called digitally actuated motor, and its rotational speed is determined by the number of pulses, and its rotational speed is determined by the pulse oscillation frequency.

The digital actuator 9 has the same operating principle as the stepping motor 12, and the opening degree of the flow rate regulating gate 5 is determined by the number of pulses, and the required opening or closing speed is determined by the pulse oscillation frequency.

First, if the raw material conditions a such as the brand of raw material, particle size distribution, compounding ratio, and amount are combined with the number of revolutions of the distribution chute 3 for distributing the raw material,
The number of revolutions C, etc. at a given inclination angle of the distribution chute 3 are input in advance into the setting device 14 according to the operating method of the blast furnace, and the data stock section 15 is filled with the raw material of the flow rate adjustment game 1-5 as shown in FIG. Input the outflow characteristics.

In Fig. 3, X indicates the coke outflow rate characteristics, and y indicates the iron ore outflow rate characteristics. The unstable regions of iron ore outflow are shown respectively.

Next, when the raw material in the hopper 6 is charged into the furnace, various signals are sent from the setter 14 to the calculator 11 and are calculated based on the data in the data stock section 15.

That is, the computing unit 11 extracts the raw material flow rate characteristic from the data stock section 15 in response to the raw material condition a of the raw material that is input, and also in response to the number of revolutions C that is the input and each number of revolutions C at an arbitrary inclination angle of the distribution chute 3. The required raw material distribution time when the distribution chute 3 is operated at the standard rotation speed is calculated by the calculator 11.

The opening degree of the flow rate adjustment gate 5 for flowing out the raw material within the calculated time is determined by the calculator 11 from the raw material flow rate characteristics as shown in FIG.
Check whether it is in the unstable region.

If it is in the unstable range, increase or decrease the standard rotation speed to adjust the flow rate so that it can be used within the optimal range based on the raw material outflow characteristics of Genit 5, or conversely adjust the raw material discharge time based on the appropriate raw material outflow rate. The rotation speed of the distribution chute 3 may be calculated based on this time.

As described above, the calculator 11 calculates the number of revolutions and the revolution speed of the distribution chute 3 using various data in the data stock section 15 according to the raw material distribution command set in the setting device 14, and calculates the required number of revolutions for the pulse oscillator 13. At the same time as oscillating the pulse signal, the opening degree of the flow rate adjustment gate 5 is similarly calculated to cause the pulse oscillator 10 to oscillate a required pulse signal, and the pulse signal of the pulse oscillator 10 operates the digital actuator 9 to adjust the flow rate. The gate 5 opens as appropriate, and the stepping motor 12 is actuated by the pulse signal from the pulse oscillator 13 to rotate the distribution chute 3 at an appropriate speed, thereby distributing the desired raw material.

In this way, raw material charging control can be performed in a manner that has not been possible in the past.

In other words, the relationship between the inclination angle of the distribution chute and the rotation speed, and the relationship between the rotation speed of the distribution chute and the opening degree of the flow rate adjustment gate are input into the setting device, and the calculation device calculates the relationship according to the data in the data stock section and generates the required pulse signal. By causing the oscillator to oscillate, when rotating the distribution chute and distributing the raw material while changing the inclination angle of the distribution chute, it is possible to charge the raw material by changing the rotation speed of the distribution chute at each inclination angle, Furthermore, by changing the opening degree of the flow rate regulating gate, the flow rate of the raw material itself can be changed every time the distribution chute turns, and the amount of raw material charged per turn can be changed.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, it is optional to use a stepping motor, a stepping cylinder, etc. as a digital actuator, or to incorporate a data stock section into a setting device or a computing device.
It goes without saying that various other changes may be made without departing from the gist of the invention.

As described above, according to the raw material distribution control force method in the bellless furnace top charging device of the present invention, (I) the number of revolutions of the distribution chute can always be obtained within the optimum range in terms of the raw material outflow rate of the flow rate adjustment gate; The raw material outflow uncertainty factor of the flow rate adjustment gauge allows the operator to reliably perform the intended raw material distribution.

(II) In raw material distribution, it is possible to easily and reliably control the rotation speed of the distribution chute for each revolution and the amount of raw material falling during each revolution, thereby increasing the degree of freedom in raw material distribution and improving controllability. can.

(@ Since one digital talker type drive source is used, the positions of the distribution chute and flow rate adjustment gate can be determined by the number of pulses, eliminating the need for a sensor to detect the position of the flow rate adjustment gate, which was required in the past. It can be made into an open loop, simplifying the device and improving reliability.

Demonstrates excellent effects such as

[Brief explanation of drawings]

FIG. 1 is an explanatory vertical sectional view showing the configuration of a bellless furnace top charging device, FIG. 2 is an explanatory diagram showing an embodiment of the material distribution control force method in the bellless furnace top charging device of the present invention, and FIG. The figure is a graph showing raw material outflow characteristics. 3...Distribution chute, 4A...This distribution chute, the turning mechanism of 3, 5...Flow rate adjustment gate, 8...This flow rate adjustment gate 5 Opening/closing mechanism, 9... Digital actuator, 10, 1
3... Pulse oscillator, 11... Arithmetic unit, 12... Stepping motor, 14...
...Setting device, 15...Data stock section.

Claims (1)

[Claims] 1 In the bell-less furnace top charging device, a computer calculates the optimal opening degree of the flow rate adjustment gate and rotation speed of the distribution chute based on the raw material conditions, distribution pattern, and raw material flow rate characteristics, and based on this calculation, the pulse oscillator A raw material characterized in that a required pulse signal is oscillated and the pulse signal is sent to a digital actuator connected to a flow rate adjustment gate opening/closing mechanism and a stepping motor connected to a rotating mechanism of a distribution chute to perform raw material distribution control. Distributed control force method.