KR100722383B1 - Device for controlling vibration in pulverizer mill and controlling method thereof - Google Patents

Abstract

The present invention relates to a vibration control device for a pulverized coal production machine and a control method thereof, including a coal feeder for supplying raw coal and a grinder for crushing the raw coal supplied from the coal feeder, wherein the water pipe is hypothesized to spray water into the coal feeder. And a controller for controlling the flow control valve so as to spray the corresponding amount of water into the feeder according to the vibration amount of the grinder detected from the vibration detector, and a flow control valve installed in the grinder, and a vibration detector. And detecting a vibration average value of the detected vibration amount, calculating a spray amount corresponding to the vibration value, and controlling the sprayed amount to be sprayed into the coal feeder.

Pulverized Coal Blowing Equipment, Feeder, Grinder, Controller, Vibration Detector, Spray Nozzle

Description

DEVICE FOR CONTROLLING VIBRATION IN PULVERIZER MILL AND CONTROLLING METHOD THEREOF

1 is a schematic diagram of a vibration control apparatus for a pulverized coal mill according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the feeder and the mill of FIG. 1.

3 is a view showing a vibration control process of the pulverized coal mill according to an embodiment of the present invention.

Figure 4 is a graph showing the correlation of the spray quantity to the vibration generation of the grinder according to an embodiment of the present invention.

Figure 5 is a graph comparing the vibration state of the mill before and after spraying according to an embodiment of the present invention.

The present invention relates to a vibration control device for a pulverized coal production machine and a control method thereof, and more particularly, to a vibration of a pulverized coal production pulverizer for controlling to reduce the vibration of the pulverizer by spraying a predetermined amount of water to the feeder according to the vibration amount of the pulverizer. A control device and a control method thereof.

In general, pulverized coal may be used as a fuel for ironing and smelting iron ore in the steelmaking process. This pulverized coal is a pulverized raw coal below a certain particle size.

The pulverized coal blowing facility which grinds the raw coal into pulverized coal and blows it into the blast furnace can replace expensive coke with low cost ordinary coal and contribute to cost reduction and productivity increase.

This pulverized coal injection facility transfers coal loaded in a yard to a conveyor and stores it in a raw coal storage hopper. The raw coal stored in the raw coal storage hopper is supplied to a feeder installed in the lower portion. At this time, a predetermined amount of raw coal set by the driver in the coal supply amount setter is output to the coal feeder and supplied to the lower grinder.

The raw coal fed to the grinder is pulverized into pulverized coal having a particle size of about 200 mesh or less by rotation of a roll tire and a turn table in the grinder. The pulverized coal is dried by the exhaust gas generated during combustion in the hot stove, transported to the bag filter, and blown through the blast furnace blast furnace.

Recently, the raw coal used is a lot of semi-anthracite coal with high calorific value and low ash. Most of these semi-anthracite coals are made of fine coal. Particulates of the coal are blown up to the bag filter before reaching the turn table by the hot air from the bottom during the dropping from the coal feeder to the grinder, which is why the turntable (Turn) is larger than the amount of raw coal supplied from the coal feeder. The amount of raw coal supplied between the table and the roll tire is significantly reduced.

In this way, when the amount of supply of coal supplied to the grinder is reduced, the frictional resistance between the turntable of the grinder and the roll tire is increased, and the vibration is generated. .

Therefore, Korean Patent Laid-Open Publication No. 2004-0034092 sets the amount of coal supply flowing into the grinder according to the vibration amount of the grinder to control the vibration generated in the grinder.

However, when the amount of feed coal supplied to the grinder is set high in order to suppress the vibration of the grinder, there is a problem in that the case of stopping and restarting the production facility of the pulverized coal is repeated due to an increase in the production amount compared to the amount of pulverized coal.

The present invention has been made to solve the above problems, an object of the present invention is to control the vibration control device of the pulverized coal manufacturing mill for controlling to reduce the vibration of the pulverizer by spraying a certain amount of water to the feeder in accordance with the vibration amount of the pulverizer and its control To provide a way.

In order to achieve the above object, the vibration control apparatus of the pulverized coal mill of the present invention includes a coal feeder for supplying raw coal, and a grinder for crushing the raw coal supplied from the coal feeder, and a water pipe that is hypothesized to spray water into the coal feeder. And a controller for controlling the flow control valve so as to spray the feeder with a corresponding spray water quantity according to the vibration amount of the grinder detected from the vibration detector.

The feeder may be provided with a spray nozzle connected to the water pipe at the outlet end.

 The controller converts the vibration amount detected by the vibration detector into a current signal, a vibration average calculator that calculates an average value of the vibration amount output from the vibration converter, and an average vibration value output from the vibration average converter as spray quantity. It may include a vibration / spray amount converter in terms of conversion, and a spray amount controller for controlling the flow rate control valve to spray the sprayed water quantity converted in the vibration / spray amount converter to the feeder.

The apparatus may further include a flow rate detector installed on the water pipe and connected to the injection amount controller so as to detect the quantity of spray supplied to the feeder through the water pipe.

In addition, the vibration control method of the pulverized coal mill of the present invention comprises the steps of detecting the vibration amount of the pulverizer, calculating the average value of the vibration for the detected vibration amount, converting the amount of spray corresponding to the vibration amount and the conversion Controlling the sprayed water quantity to spray the feeder.

In the spray quantity calculation step, the spray quantity has a linear function relation proportional to the amount of vibration. In the spray control step, it is preferable to keep the amount of vibration of the pulverizer below 10 mu.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted for simplicity of explanation, and like reference numerals designate like elements throughout the specification.

1 is a schematic diagram of a vibration reduction device of a pulverized coal production pulverizer according to an embodiment of the present invention, Figure 2 is a schematic view showing a cross-section of the feeder and pulverizer of FIG.

Referring to these drawings, the vibration reduction device of the pulverized coal producing apparatus according to the present embodiment includes a feeder 10 for supplying raw coal and a water pipe 40 installed to inject water into the feeder 10. A flow control valve 36 provided on the bed, a pulverizer 20 for pulverizing the raw coal supplied from the feeder 10 into pulverized coal, a vibration detector 31 provided in the pulverizer 20, and the vibration detector And a controller 30 for controlling the flow rate control valve 36 to spray the water supply 10 with a corresponding amount according to the vibration amount of the grinder 20 detected from the 31.

The feeder 10 supplies to the grinder 20 the amount set by the driver to the feeder amount setter from the raw coal storage hopper 1 for storing the raw coal transported through the conveyor in the yard.

The feeder 10 is provided with a conveyor belt 12 which is wound around the pulleys 11 and rotates and transports the raw coal supplied from the raw coal storage hopper 1 to the grinder 20. It is disposed adjacent to the tip end of the feeder 10, that is, the outlet 13 side of the feeder 10, and sprays the water supplied through the water pipe 40 to the raw coal transported along the conveyor belt 12. A spray nozzle 41 is provided.

It is provided on the water pipe 40 which supplies water to this spray nozzle 41, and the flow volume control valve 36 by which the opening degree is controlled by the controller 30 is provided. The flow control valve 36 may be made of an electromagnetic flow control valve, for example a solenoid valve, to enable electronic control by the controller 30.

Then, one side of the flow control valve 36 controls the flow control valve 36 to detect the flow rate supplied through the water pipe 40, the flow rate detector 37 for providing the detected information to the controller 30 Is installed more.

The pulverizer 20 produces pulverized coal by pulverizing the raw coal supplied from the feeder 10 by rotation of a roll tire 21 and a turn table 22. The pulverized coal is dried by the exhaust gas generated during combustion in the hot stove 50 (hereinafter referred to as "hot wind") and transported to the bag filter 60. The pulverized coal carried to the bag filter 60 is blown through the tuyere of the blast furnace 90 in the blowing hopper 80 through the pulverized coal storage hopper 70.

When the amount of coking coal of the raw coal supplied from the feeder 10 is significantly reduced, the crusher 20 increases the frictional resistance between the internal turntable 22 and the roll tires 21, so that the amount of vibration generated when the metals collide with each other. A vibration detector 31 for detecting is provided.

The controller 30 is configured to spray a predetermined amount of water into the coke 10 according to the vibration amount of the grinder 20 detected from the vibration detector 31, the vibration converter 32, the vibration average converter 33, A vibration / spray rate converter 34, and a spray rate controller 35.

The vibration converter 32 inputs a vibration average converter 33 for converting the vibration value detected through the vibration detector 31 into a current signal. This vibration average converter 33 calculates the vibration value that changes momentarily severely as a stable average value for a certain time.

The vibration average value input to the vibration / spray amount converter 34 through the vibration average converter 33 is converted into the spray flow rate according to the preset vibration value conversion setting instrument. Then, the spray amount controller 35 controls the flow rate control valve 36 such that the sprayed water amount converted through the vibration / spray amount changer 34 is supplied to the feeder 10 through the spray nozzle 41. At this time, the opening amount of the flow control valve 36 is determined by the flow rate of the water pipe 40 detected through the flow rate detector 37.

Hereinafter, a process in which the pulverized coal production pulverizer of the present embodiment reduces the vibration generated in the pulverizer through the vibration control device will be described with reference to FIG. 3.

3 is a view showing a vibration control process of the pulverized coal mill according to an embodiment of the present invention.

The control process of the pulverized coal production pulverizer according to the present embodiment will be described with reference to the drawings. The step (S1) of detecting the vibration amount of the pulverizer, the calculation of the vibration average value for the detected vibration amount (S2), Step S3 of converting the sprayed quantity corresponding to the vibration value, and controlling to spray the calculated quantity of water (S4).

First, the raw coal transported from the yard to the conveyor is stored in the raw coal storage hopper 1. The raw coal stored in the raw coal storage hopper 1 supplies the raw coal to the lower grinder 20 by rotating the feeder 10 according to the driver's supply of coal supply. The pulverizer 20 produces pulverized coal by pulverizing the supplied raw coal by the rotation of the roll tire 21 and the turntable 22 therein. Hereinafter, Table 1 shows a particle size analysis table for each type of 2004 standard.

As described above, since the size of the raw coal supplied from the raw coal storage hopper 1 to the grinder differs depending on the type of coal, the amount of vibration generated between the roll tire 21 and the turntable 22 inside the grinder 20 is also different. It occurs differently.

Table 2 below shows the amount of vibration generated in the mill according to the amount of coal produced.

As described above, in the case of the coal powder having a small particle size of the raw coal, the fine particles of the coal powder supplied to the grinder 20 through the feeder 10 before reaching the turntable 22 by the hot air coming from the lower part during the dropping ( 60) to fly up.

Therefore, the amount of the raw coal passing through the turntable 22 and the roll tire 21 of the grinder 20 than the amount of the raw coal supplied from the feeder 10 is significantly reduced in quantity, thereby generating more vibration amount.

At this time, when the amount of vibration generated in the grinder 20 is more than a predetermined amount, the grinding of the pulverized coal production equipment becomes virtually impossible due to wear in the grinder 20, that is, wear of the turntable 22 and the roll tire 21. Therefore, it is necessary to manage the amount of vibration generated in the grinder 20 to 10μ or less.

To this end, in the step (S1) of detecting the vibration amount of the grinder, the frictional resistance between the roll tire 21 and the turntable 22 inside the grinder 20 through the vibration detector 31 installed in the grinder 20 The amount of vibration generated by the controller is detected. The vibration value detected through the vibration detector 31 is converted into a current value mA in the vibration converter 32 of the controller 30 and then input to the vibration average converter 33.

In the step of calculating the average vibration value (S2), the vibration average converter 33 of the controller 30 is a stable average value for a predetermined time from the vibration value that is severely changed among the vibration values input through the vibration converter 32 Convert. And the vibration average value converted in the vibration average converter 33 is transmitted to the vibration / spray amount converter 34.

In the vibration / spray conversion step S3, the vibration / spray converter 34 is input to the conversion setting instrument on the basis of the input vibration average value and converted into the spray amount for vibration.

Figure 4 is a graph showing the correlation of the spray quantity to the vibration generation of the grinder according to an embodiment of the present invention.

Referring to FIG. 4, as the amount of vibration detected in the grinder 20 increases, the amount of spray injected through the spray nozzle 41 to reduce the vibration increases with a linear function having a constant slope as shown in Equation 1 below. It can be seen.

This will give you a table of conversion settings as shown in Table 3.

Hereinafter, Table 3 shows the average vibration value input to the conversion setting instrument and the spray amount setting value thereof.

In the spray amount control step S4, the spray amount controller 35 controls the opening amount of the flow control valve 36 disposed on the water pipe 40 to spray the amount of water calculated by the vibration / spray converter 34. Sprayed inside the feeder 10 through the nozzle 41. At this time, the opening amount of the flow control valve 36 is determined according to the supply flow rate of the water pipe 40 detected through the flow rate detector 37.

Figure 5 is a graph comparing the vibration state of the mill before and after spraying according to an embodiment of the present invention.

Referring to FIG. 5, the amount of vibration generated in the grinder 20 is sprayed by spraying a spray amount selected on the basis of Table 3 in the tip of the feeder 10 according to the amount of vibration generated in the grinder 20. It turns out that it can reduce to (10 micrometer) or less.

As such, the water sprayed on the feeder 10 through the spray nozzle 41 is mixed with the raw coal (powdered coal) supplied to the grinder 20 to increase the specific gravity of the raw coal, and also aggregate the raw coal like lump coal. Therefore, the amount supplied by the feeder 10 and the raw coal is blown off by the hot air during the fall into the grinder 20 is reduced to have the effect of increasing the actual feed amount. Therefore, the amount of vibration generated when the raw coal is pulverized in the crusher 4 is reduced to 10 μm or less.

In addition, the amount of vibration generated in the pulverizer 20 is not controlled by increasing the supply amount of the raw coal supplied to the pulverizer, but by controlling the amount of spray sprayed on the coal feeder 10 to continuously operate the pulverized coal production equipment without stopping and restarting. It is possible to freely control the amount of pulverized coal production while operating.

For example, in the case of the anthracite coal, most of the granules are made of powdered coal, and the minimum production amount that can be crushed in the grinder 20 was 33-35T / H, but the grinder 20 was controlled by adjusting the spray amount sprayed on the feeder 10. By reducing the amount of vibration generated in the system, the minimum production can be lowered to 22-26T / H. finally. It is easier to manage the management of fine coal production compared to the fine coal injection.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, the vibration control device and the control method of the pulverized coal mill according to the present invention by controlling the amount of spray sprayed from the coal feeder according to the amount of vibration generated in the pulverizer to reduce the vibration of the pulverizer, and at the same time stable It has the effect of making it manageable.

Claims (7)

A coal feeder for supplying raw coal; And It includes a grinder for grinding the raw coal supplied from the feeder, A flow control valve installed on a water pipe installed to inject water into the feeder; A vibration detector installed in the grinder; And And a controller for controlling a flow rate control valve to spray a corresponding spray water quantity into the feeder in accordance with the vibration amount of the mill detected by the vibration detector. The method of claim 1, The feeder is a vibration control device of the pulverized coal production mill is provided with a spray nozzle connected to the water pipe at the outlet end. The method of claim 1, The controller, A vibration converter for converting the vibration amount detected by the vibration detector into a current signal; A vibration average converter for calculating an average value of the vibration amounts output from the vibration converter; A vibration / spray amount converter converting the average vibration value output from the vibration average converter into spray quantity; And Vibration control device of the pulverized coal production mill including a spray amount controller for controlling the flow rate control valve to spray the sprayed water quantity converted in the vibration / spray amount converter to the feeder. The method of claim 3, And a flow rate detector installed on the water pipe, the flow rate detector being connected to the injection amount controller so as to detect the quantity of water supplied to the feeder through the water pipe. Detecting an amount of vibration of the grinder; Calculating a vibration mean value for the detected vibration amount; Converting the sprayed quantity corresponding to the vibration amount; And A method for controlling vibration of a pulverized coal pulverizer comprising the step of controlling the sprayed water quantity converted into a coal feeder. The method of claim 5, In the spray quantity calculation step, Vibration control method of the pulverized coal mill for the amount of spray is proportional to the amount of vibration in a linear function. The method of claim 5, In the spray control step, Vibration control method of the pulverized coal mill for controlling the spray so that the vibration amount of the pulverizer is kept below 10μ.

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